GOST 7505-89

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  ГОСТ 7505-89

GOST 7505−89 steel Forgings stamped. Tolerances, allowances and forging lap

GOST 7505−89

Group B03

INTERSTATE STANDARD

FORGINGS, PRESSED STEEL

Tolerances, allowances and forging lap

Steel stamping forgings. Tolerances, allowances and forging laps

OKP 08 9300

Date of introduction 1990−07−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of automobile and agricultural machinery (Minavtoselhozmash)

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on management of quality and standards from 21.09.89 N 2815

3. REPLACE GOST 7505−74

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The item number, app
GOST 2.308−79	2.10
GOST 3.1126−88	2.9
GOST 1050−88	Annex 5
GOST 2590−88	Annex 5
GOST 2789−73	4.2
GOST 4543−71	Annex 5
GOST 8479−70	1.1; 2.11
GOST 14959−79	Annex 5

5. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

6. REISSUE

This standard applies to steel stampings forgings weighing less than 250 kg and (or) with linear dimensions not larger than 2500 mm, made of hot die forging.

The standard establishes a maximum value of dimensional tolerance, geometric tolerances, allowances, blacksmith overlaps and minimum radii of curvature of the outer corners.

For forgings weighing 250 kg or more, or linear dimensions more than 2500 mm; for forgings from heat-resistant, heat-resistant and corrosion-resistant steels and alloys, as well as on the additional special elements of forgings (sample for mechanical testing, clamps for hanging forgings during heat treatment and for other technological purposes) these values are established by agreement between manufacturer and user. It is possible to manufacture forgings according to the drawings developed prior to the introduction of this standard, to 01.07.92.

1. TERMS AND EXPLANATIONS

The section provides terms and explanations adopted for the present standard.

1.1. Forging die steel (forging) is a product made of hot die forging in accordance with the technical requirements of GOST 8479.

1.2. Form forgings — dimensional figure, a certain nominal linear and angular dimensions.

1.3. Forging weight — the weight parameter forgings, determined based on its shape and steel density.

1.4. Nominal line size of the forging, the geometric parameter, measured in units of length and determined based on the linear nominal part size, a standard allowance (damn.1) and Smith’s inlet.

1 — detail; 2 — workpiece; 3 — nominal size of forgings; 4 — lower limit size of the forgings; 5 — the maximum size limit forgings; 6 — allowance; 7 — tolerance (tolerance); 8 — positive value of the acceptable deviation; 9 — negative deviation

Damn.1

1.5. The nominal angular size of the forging, the geometric parameter, measured in angular units and is determined based on the nominal angular size of the part.

1.6. The actual size of the forging — the actual size obtained by measurement with permissible error.

1.7. Limits of forging — two maximum permissible size, between which there must be or be one of them actual or nominal size.

1.8. The permissible deviation of the size of forging — the algebraic value between the maximum and the corresponding nominal size.

1.9. Tolerance (tolerance) size forgings, the absolute value of the difference between the largest and smallest limit size.

1.10. The geometric parameters of the forging (Fig.2 and 3).

Damn.2

Damn.3

1.10.1. Length (in, ) width (, ), diameter (, ), the height and depth of (, ) — element sizes of the forgings produced in one part of the stamps.

1.10.2. The thickness of the (, ) — tall size. forgings produced in both parts of the stamp.

1.10.3. Centre distance:

 — the size of a line segment connecting the two centers and do not cross the outer contour of the forging (see the devil.2);

 — the same intersects the outer contour of the forging (see the devil.3).

1.10.4. The radius of curvature of the internal angle () is the radius of curvature in cross section of the concave portion of the surface of the forging (see the devil.2).

1.10.5. The radius of curvature of the outer corner () is the radius of curvature in cross section of a convex portion of the surface of the forging (see the devil.2).

1.11. Shape tolerance forgings — allowable deviation of shape forgings.

1.12. Deflection shape forgings

1.12.1. Offset parting surface of the stamp () — deviation of the shape forgings in the form of the largest transfer line in the plane of one part of the forging relative to the other, calculated by the formulas:

for stamps with one parting surface (Fig.4A)

for dies with two or more parting surfaces (Fig.4B)

,

where  — offset value;

 — the minimum size of the forgings in the direction of the line of transfer;

 — the largest size of the forgings in the direction of line transfer.

Damn.4

1.12.2. The deviation from concentricity () is the distance from the center of the deaf or punched holes to coordinates of the center of the hole on the forging drawing (DWG.4B).

1.12.3. Deviation from alignment () is the angular deviation of the bore axis from the axis of the forging (Fig.4D), measured in units of length.

1.12.4. The residual dross () is a ledge left on the forging after trimming deflashing or punch holes (Fig.5A).

Damn.5

1.12.5. Cut edge (s) flange forgings, formed when cutting the fin or the puncture opening (Fig.5B).

1.12.6. Burr () is a protrusion formed on the surface of forgings in unintended health for the placement of the fin places of articulation of the parts of the stamp (gaps), as well as trimming burrs and punching holes and measured the height (Fig.6: and — when bezoblachnoe stamping b — for stamping in dies, in — when cutting burrs and punching holes).

Damn.6

1.12.7. The trace of the ejector stamp is the local deviation of the position of the surface of the forging under the action of the ejector stamp.

1.12.8. A curve () is the deviation of the centerline of the forgings from the nominal position in the direction of the greatest length or width of the forging (Fig.7a).

Damn.7

1.12.9. Deviation from flatness the deviation from the plane, estimated the greatest distance from actual surface to the surrounding plane (see the devil.7a).

1.12.10. Flatness tolerance () is a maximum permissible deviation from flatness (see the devil.7a).

1.12.11. Deviation from straightness deviation from straightness in the plane, evaluated by the maximal distance from points of the actual profile to the adjacent straight (damn.7b).

1.12.12. Tolerance of straightness () — the maximum permissible deviation from straightness.

1.12.13. Radial runout — the difference between the largest and smallest distances from the profile section of the forging to its axis.

1.12.14. Tolerance of radial runout — maximum permissible value of radial runout.

1.13. Allowance — metal layer on the treated parts of the surface of the forging to be removed when it is machined.

1.14. Forging the slouchy fit — the extra volume of metal (layer) on cultivated or uncultivated parts of the surface of the forgings required for the implementation of formoizmeneniya operations.

1.15. Forging weight calculation and the set value used in the assignment of allowances and tolerances.

1.16. Source index — a relative indicator, taking into account the aggregate amount of constructive characteristics (accuracy class, group of steel, the degree of difficulty, the configuration of the parting surface) and mass of the forging.

2. GENERAL REQUIREMENTS

2.1 Linear dimensions in the drawing forgings shall be marked from the specified source database machining, agreed between manufacturer and user (Fig.8).

Damn.8

2.2. Tolerances established by this standard apply to all the nominal dimensions of the forging.

2.3. The allowances established by this standard apply to the treated surface of the forging.

2.4. Tolerances, allowances and forging overlaps are set depending on the constructive characteristics of forgings given in table.1, and determined based on the roughness of the processed surface of parts made from forgings, and depending on the dimensions and weight of the forgings. For the 1st accuracy class T1 tolerances are established on the functional surfaces, which are not subject to final machining.

Table 1

The design characteristics of forging	The designation and determination of structural characteristics	Note
1. Accuracy class	T1 — 1st class T2 — 2nd « T3 — 3rd « T4 — 4th « T5 — 5th «	Is defined in Annex 1 (table.19)
2. Steel panel	M1 — steel with a mass fraction of carbon to 0.35% incl. and the total mass fraction of alloying elements to 2.0% incl.; M2 — steel with a mass fraction of carbon in excess of 0.35 to 0.65% incl. or the total mass fraction of alloying elements in excess of 2.0 to 5.0% incl.; M3 — steel with a mass fraction of carbon more than 0,65% or the total mass fraction of alloying elements in excess of 5.0%	When you assign a group of steel determining factor is the average mass content of carbon and alloying elements (Si, Mn, Cr, Ni, Mo, W, V)
3. The degree of difficulty	C1 — 1st degree C2 — 2-I « C3 — 3-I « S4 — 4-I «	Installed the app 2
4. The configuration of the parting surface of the stamp	P — flat;  — symmetrically curved;  — asymmetrically curved

2.5. The estimated weight of the forging is defined as the mass is subjected to deformation forgings (forgings) or parts. In a lot of forgings do not include the mass of the fin and edges of the punched hole.

When landing forging on horizontal forging machines or the local forging hammers and presses forging weight includes the mass of the rod clamped by the dies.

2.6. Estimated weight of forgings is based on its nominal size.

Estimated value of the estimated mass of forgings () may be calculated by the formula

,

where is the calculated mass of forging, kg;

 — part mass, kg;

 — the estimated coefficient to be set in accordance with Annex 3 (tab.20).

2.7. Accuracy class of forgings is set depending on the technological process and equipment for its production (see Annex 1, tabl.19), and also proceeding from requirements to dimensional accuracy of forgings.

Various classes of accuracy for different sizes of the same forging. The accuracy class is determined by the prevailing number of dimensions of a single accuracy class determined by drawing forgings, and are to be agreed between manufacturer and user.

2.8. Accuracy class, group of steel, the degree of difficulty needs to be specified on the forging drawing.

2.9. Rules of drawing of forging — according to GOST 3.1126.

2.10. The permissible deviations of form and position of surfaces should be indicated on the drawing, forgings in accordance with the requirements of GOST 2.308*. Acceptable deviation radius and the stamping of the slope can be indicated in the drawing of forgings according to customer’s requirement.
________________
* On the territory of the Russian Federation the document is not valid. Valid GOST 2.308−2011. — Note the manufacturer’s database.

2.11. Technical requirements for the forging are established according to GOST 8479.

3. DEFINITION OF THE INITIAL INDEX

3.1. Source index for later use of basic allowances, tolerances and permissible deviations is determined depending on weight, grade of steel, degree of complexity and accuracy class forgings (tab.2).

Table 2

Definition of the initial index

3.2. To determine the source of the index table.2 in the column of «forging Weight» find weight corresponding to the given row and moving horizontally to the right or by thickened oblique lines right down to the intersection with the vertical lines corresponding to specified values of the group become M, degree of difficulty, accuracy class T, set the source index (1 to 23).

Examples (damn.9):

1. Forging a mass of 0.5 kg, the group became M1, the degree of complexity C1, class T2.

The original index — 3.

2. Forging a mass of 1.5 kg, steel panel 3, the degree of difficulty S2, accuracy class T1.

Source index — 6.

Damn.9

3.3. The source code must be specified on the forging drawing.

4. THE MACHINING ALLOWANCES

4.1. The allowance for machining includes a core and additional allowances, taking into account the deviation of the shape of the forging. The value of allowances should be on one side of the nominal size of forgings.

4.2. Basic allowances for machining of forgings depending on the source of the index, determined in accordance with clause 3.2, the linear dimensions and the surface roughness of the parts according to GOST 2789 set at the table.3.

Table 3

Basic machining allowances (per side)

mm

Source index	The thickness of the part
	up to 25			25−40			40−63			63−100			100−160			160−250			over 250
	Length, width, diameter, depth, and elevation details
	up to 40			40−100			100−160			160−250			250−400			400−630			630−1000			1000−1600			1600−2500
	100 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25	One hundred 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25	100 12,5	10 1,6	1,25
1	0,4	0,6	0,7	0,4	0,6	0,7	0,5	0,6	0,7	0,6	0,8	0,9	0,6	0,8	0,9	-	-	-	-	-	-	-	-	-	-	-	-
2	0,4	0,6	0,7	0,5	0,6	0,7	0,6	0,8	0,9	0,6	0,8	0,9	0,7	0,9	1,0	0,8	1,0	1,1	-	-	-	-	-	-	-	-	-
3	0,5	0,6	0,7	0,6	0,8	0,9	0,6	0,8	0,9	0,7	0,9	1,0	0,8	1,0	1,1	0,9	1,1	1,2	1,0	1,3	1,4	-	-	-	-	-	-
4	0,6	0,8	0,9	0,6	0,8	0,9	0,7	0,9	1,0	0,8	1,0	1,1	0,9	1,1	1,2	1,0	1,3	1,4	1,1	1,4	1,5	-	-	-	-	-	-
5	0,6	0,8	0,9	0,7	0,9	1,0	0,8	1,0	1,1	0,9	1,1	1,2	1,0	1,3	1,4	1,1	1,4	1,5	1,2	1,5	1,6	1,3	1,6	1,8	-	-	-
6	0,7	0,9	1,0	0,8	1,0	1,1	0,9	1,1	1,2	1,0	1,3	1,4	1,1	1,4	1,5	1,2	1,5	1,6	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0
7	0,8	1,0	1,1	0,9	1,1	1,2	1,0	1,3	1,4	1,1	1,4	1,5	1,2	1,5	1,6	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,2
8	0,9	1,1	1,2	1,0	1,3	1,4	1,1	1,4	1,5	1,2	1,5	1,6	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,2	1,9	2,3	2,5
9	1,0	1,3	1,4	1,1	1,4	1,5	1,2	1,5	1,6	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,2	1,9	2,3	2,5	2,0	2,5	2,7
10	1,1	1,4	1,5	1,2	1,5	1,6	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,2	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0
11	1,2	1,5	1,6	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,0	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3
12	1,3	1,6	1,8	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,2	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5
13	1,4	1,7	1,9	1,5	1,8	2,0	1,7	2,0	2,2	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8
14	1,5	1,8	2,0	1,7	2,0	2,2	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1
15	1,7	2,0	2,2	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7
16	1,9	2,3	2,5	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1
17	2,0	2,5	2,7	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6
18	2,2	2,7	3,0	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6	4,5	5,7	6,2
19	2,4	3,0	3,3	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6	4,5	5,7	6,2	4,9	6,2	6,8
20	2,6	3,2	3,5	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6	4,5	5,7	6,2	4,9	6,2	6,8	5,4	6,8	7,5
21	2,8	3,5	3,8	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6	4,5	5,7	6,2	4,9	6,2	6,8	5,4	6,8	7,5	5,8	7,4	8,1
22	3,0	3,8	4,1	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6	4,5	5,7	6,2	4,9	6,2	6,8	5,4	6,8	7,5	5,8	7,4	8,1	6,2	7,9	8,7
23	3,4	4,3	4,7	3.7 V	4,7	5,1	4,1	5,1	5,6	4,5	5,7	6,2	4,9	6,2	6,8	5,4	6,8	7,5	5,8	7,4	8,1	6,2	7,9	8,7	7,1	9,1	10,0

Allowances for the thickness of the forgings are subjected to cold or hot calibration are set according to Annex 4.

4.3. Additional allowances to take account of the offset forging, flexion, deviation from flatness and straightness, center-to-center and center-to-center distances, angular sizes are determined based on the shape of the forging and technology of its manufacture.

Depending on the accuracy class of T establishes additional allowances for machining.

4.3.1. The offset parting surfaces of dies is at the table.4.

Table 4

Forging weight, kg	Allowance for accuracy classes, mm
	Flat surface connector ()
	T1	T2	T3	T4	T5
			Symmetrically cambered surface connector ()
			T1	T2	T3	T4	T5
				Asymmetrically cambered surface connector ()
				T1	T2	T3	T4	T5
0.5 incl.	0,1	0,1	0,1	0,1	0,2	0,2	0,3	0,3
SV. 0.5 to 1.0 «				0,2		0,3
«To 1.0» to 1.8 «			0,2		0,3			0,4
«The 1.8» to 3.2 «		0,2		0,3			0,4	0,5
«3,2» 5,6 «	0,2		0,3			0,4	0,5	0,6
«5,6» 10,0 «		0,3			0,4	0,5	0,6	0,7
«10,0» 20,0 «	0,3			0,4	0,5	0,6	0,7	0,9
«20,0» 50,0 «			0,4	0,5	0,6	0,7	0,9	1,2
«50,0» 125,0 «		0,4	0,5	0,6	0,7	0,9	1,2	1,6
«125,0» 250,0 «	0,4	0,5	0,6	0,7	0,9	1,2	1,6	2,0

4.3.2. Curves and deviations from flatness and straightness — table.5.

Table 5

mm

The largest size of the forgings	Allowances for accuracy classes
	T1	T2	T3	T4	T5
Up to 100 incl.	0,1	0,2	0,2	0,3	0,4
SV. 100 «160 «	0,2	0,2	0,3	0,4	0,5
«160» 250 «	0,2	0,3	0,4	0,5	0,6
«250» 400 «	0,3	0,4	0,5	0,6	0,8
«400» 630 «	0,4	0,5	0,6	0,8	1,0
«630» 1000 «	0,5	0,6	0,8	1,0	1,2
«1000» 1600 «	0,6	0,8	1,0	1,2	1,6
«1600» 2500 «	0,8	1,0	1,2	1,6	2,0

4.3.3. Deviation in center distance — table.6.

Table 6

mm

The distance between the centers, axes	Allowances for accuracy classes
	T1	T2	T3	T4	T5
Up to 60 incl.	0,1	0,1	0,2	0,2	0,3
SV. 60 «100 «	0,1	0,2	0,2	0,3	0,5
«100» 160 «	0,2	0,2	0,3	0,5	0,8
«160» 250 «	0,2	0,3	0,5	0,8	1,2
«250» 400 «	0,3	0,5	0,8	1,2	1,6
«400» 630 «	0,5	0,8	1,2	1,6	2,0
«630» 1000 «	0,8	1,2	1,6	2,0	2,5
«1000» 1600 «	1,2	1,6	2,0	2,5	4,0
«1600» 2500 «	1,6	2,0	2,5	4,0	6,0

4.3.4. The amount of the additional allowance that takes into account deviations of angular dimensions, established by agreement between manufacturer and user.

4.4. It is permitted to round the linear dimensions of forgings with precision to 0.5 mm.

4.5. When you assign the value of the stock on the surface, whose position is determined by two or more dimensions of the forging, the maximum value of the allowance for the surface.

4.6. In the manufacture of rod forging two-way landing or forgings, where the rods are not subject to deformation, allowances for processing should be based is given in section 5.6 tolerances in length of the rods.

4.7. The minimum value of the radii of the rounded outer corners of forgings depending on the depth of the cavity of the stream of the stamp is set at the table.7.

Table 7

Forging weight, kg	Minimum radius curves, mm, at the depth of the cavity of the stream of the stamp, mm
	to 10 incl.	10−25	25−50	over 50
And 1.0 incl.	1,0	1,6	2,0	3,0
SV. Of 1.0 «to 6.3 «	1,6	2,0	2,5	3,6
«A 6.3» 16,0 «	2,0	2,5	3,0	4,0
«16,0» 40,0 «	2,5	3,0	4,0	5,0
«40,0» 100,0 «	3,0	4,0	5,0	7,0
«100,0» 250,0 «	4,0	5,0	6,0	8,0

4.8. In the manufacture of forgings according to the accuracy class T5 with the application of flame heating of workpieces allowed to increase the allowance for forgings with mass:

		to 3.2	kg	-	to	0,5	mm;
	3,2	«10,0	«	-	«	0,8	«;
	St.	10,0	«	-	«	1,0	».

5. TOLERANCES

5.1. Tolerances and permissible deviations linear dimensions of forgings are dependent on the source index and dimensions of the forging at the table.8.

Table 8

Tolerances and permissible deviations linear dimensions of forgings

mm

Source index	Maximum thickness of forgings
	up to 40		40−63		63−100		100−160		160−250		over 250
	Length, width, diameter, depth, and height of the forging
	up to 40		40−100		100−160		160−250		250−400		400−630		630−1000		1000−1600		1600−2500
1	0,3	+0,2 -0,1	0,4	+0,3 -0,1	0,5	+0,3 -0,2	0,6	+0,4 -0,2	0,7	+0,5 -0,2	-	-	-	-	-	-	-	-
2	0,4	+0,3 -0,1	0,5	+0,3 -0,2	0,5	+0,4 -0,2	0,7	+0,5 -0,2	0,8	+0,5 -0,3	0,9	+0,6 -0,3	-	-	-	-	-	-
3	0,5	+0,3 -0,2	0,6	+0,4 -0,2	0,7	+0,5 -0,2	0,8	+0,5 -0,3	0,9	+0,6 -0,3	1,0	+0,7 -0,3	1,2	+0,8 -0,4	-	-	-	-
4	0,6	+0,4 -0,2	0,7	+0,5 -0,2	0,8	+0,5 -0,3	0,9	+0,6 -0,3	1,0	+0,7 -0,3	1,2	+0,8 -0,4	1,4	+0,9 -0,5	-	-	-	-
5	0,7	+0,5 -0,2	0,8	+0,5 -0,3	0,9	+0,6 -0,3	1,0	+0,7 -0,3	1,2	+0,8 -0,4	1,4	+0,9 -0,5	1,6	+1,1 -0,5	2,0	+1,3 -0,7	-	-
6	0,8	+0,5 -0,3	0,9	+0,6 -0,3	1,0	+0,7 -0,3	1,2	+0,8 -0,4	1,4	+0,9 -0,5	1,6	+1,1 -0,5	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9
7	0,9	+0,6 -0,3	1,0	+0,7 -0,3	1,2	+0,8 -0,4	1,4	+0,9 -0,5	1,6	+1,1 -0,5	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0
8	1,0	+0,7 -0,3	1,2	+0,8 -0,4	1,4	+0,9 -0,5	1,6	+1,1 -0,5	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1
9	1,2	+0,8 -0,4	1,4	+0,9 -0,5	1,6	+1,1 -0,5	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2
10	1,4	+0,9 -0,5	1,6	+1,1 -0,5	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3
11	1,6	+1,1 -0,5	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5
12	2,0	+1,3 -0,7	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7
13	2,2	+1,4 -0,8	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9
14	2,5	A 1.6 -0,9	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1
15	2,8	+1,8 A 1.0	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4
16	3,2	+2,1 -1,1	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7
17	3,6	+2,4 -1,2	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0
18	4,0	+2,7 -1,3	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0	10,0	+6,7 -3,3
19	4,5	3.0 a -1,5	5,0	+3.3 V -1,7	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0	10,0	+6,7 -3,3	11,0	+7,4 -3,6
20	5,0	+3.3 V -1,7	5,6	+3.7 V A 1.0	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0	10,0	+6,7 -3,3	11,0	+7,4 -3,6	12,0	+8,0 -4,0
21	5,6	+3.7 V -1,9	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0	10,0	+6,7 -3,3	11,0	+7,4 -3,6	12,0	+8,0 -4,0	13,0	Is +8.6 -4,4
22	6,3	+4,2 Of -2. 1	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0	10,0	+6,7 -3,3	11,0	+7,4 -3,6	12,0	+8,0 -4,0	13,0	Is +8.6 -4,4	14,0	+9,2 -4,8
23	7,1	The 4.7 -2,4	8,0	+5,3 -2,7	9,0	+6,0 Is 3.0	10,0	+6,7 -3,3	11,0	+7,4 -3,6	12,0	+8,0 -4,0	13,0	Is +8.6 -4,4	14,0	+9,2 -4,8	16,0	+10,0 -6,0

5.2. Tolerance of the internal dimensions of the forgings shall be installed with reverse signs.

Tolerances and permissible tolerances (see the devil.2), reflecting the one-sided wear of the dies equal to 0.5 the values given in table.8.

5.3. Tolerances and permissible deviations of dimensions of thickness, taking into account nepostanovku, are established by the maximum thickness of forgings and extend to all dimensions of its thickness.

5.4. The thickness tolerances of the forgings are subjected to cold or hot calibrating, established by Annex 4.

5.5. The tolerance of the dimensions not specified in the drawing, forgings, shall be equal to 1.5 admission of appropriate size forgings with equal admissible deviations.

5.6. For forgings, where the rod extends beyond the die and is not subjected to deformation, the length tolerance of the rod will accept, mm

	to	2 —	for	forgings	1st	class	precision
	«	3	«	«	2nd	«	«
	«	4	«	«	3rd	«	«
	«	5	«	«	4th	«	«
	«	6	«	«	5th	«	«

The tolerance is the length of the undeformed rod forgings have received bilateral landing doubles. For forgings, obtained by planting, followed by punching and drop-off rental of measuring length, the length tolerance of the rod established by agreement between manufacturer and user.

In tolerance does not include variations in crushing and aperpendicular the ends of the rod.

For a portion of the web clamped in the die, or in the grip when punching from the back stop may increase the diameter of the rod on the value of double positive tolerances table.8 at a distance of two diameters from the head of the forging and a half diameters from the end of the rod.

The permissible deviations of sizes of cross-section of the rod on the rigid sections of the forgings be determined by the standards assortment of rental with increasing negative deviation of more than 0.5 mm.

5.7. Permissible displacement of the parting surface of the stamp is determined depending on the mass of the forging, the configuration of the parting surface of the die and the accuracy class and must not exceed the values given in table.9.

Table 9

Forging weight, kg	Permissible displacement of the parting surface of the stamp, mm
	A flat parting surface of the stamp ()
	T1	T2	T3	T4	T5
		Symmetrically curved parting surface of the stamp ()
		T1	T2	T3	T4	T5
			Asymmetrically curved parting surface of the stamp ()
			T1	T2	T3	T4	T5
0.5 incl.	0,1	0,2	0,2	0,3	0,4	0,5	0,6
SV. 0,5 «1,0 «	0,2	0,2	0,3	0,4	0,5	0,6	0,7
«To 1.0» to 1.8 «	0,2	0,3	0,4	0,5	0,6	0,7	0,8
«The 1.8» to 3.2 «	0,3	0,4	0,5	0,6	0,7	0,8	1,0
«3,2» 5,6 «	0,4	0,5	0,6	0,7	0,8	1,0	1,2
«5,6» 10,0 «	0,5	0,6	0,7	0,8	1,0	1,2	1,4
«10,0» 20,0 «	0,6	0,7	0,8	1,0	1,2	1,4	1,8
«20,0» 50,0 «	0,7	0,8	1,0	1,2	1,4	1,8	2,5
«50,0» 125,0 «	0,8	1,0	1,2	1,4	1,8	2,5	3,2
«125,0» 250,0 «	1,0	1,2	1,4	1,8	2,5	3,2	4,0

5.8. Permissible value of the residual fin is determined depending on the mass of the forging, the configuration of the parting surface of the die and the accuracy class and is assigned by the table.10.

Table 10

Forging weight, kg					Permissible value of the residual Burr, mm
A flat parting surface of the stamp ()
T1	T2	T3	T4	T5
	Symmetrically curved parting surface of the stamp ()
		T1	T2	T3	T4	T5
			Asymmetrically curved parting surface of the stamp ()
			T1	T2	T3	T4	T5
0.5 incl.					0,2	0,3	0,4	0,5	0,6	0,7	0,8	0,9
SV.	0,5	to	1,0	«	0,3	0,4	0,5	0,6	0,7	0,8	0,9	1,0
«	1,0	«	1,8	«	0,4	0,5	0,6	0,7	0,8	0,9	1,0	1,2
«	1,8	«	3,2	«	0,5	0,6	0,7	0,8	0,9	1,0	1,2	1,4
«	3,2	«	5,6	«	0,6	0,7	0,8	0,9	1,0	1,2	1,4	1,6
«	5,6	«	10,0	«	0,7	0,8	0,9	1,0	1,2	1,4	1,6	1,8
«	10,0	«	20,0	«	0,8	0,9	1,0	1,2	1,4	1,6	1,8	2,2
«	20,0	«	50,0	«	0,9	1,0	1,2	1,4	1,6	1,8	2,2	2,8
«	50,0	«	125,0	«	1,0	1,2	1,4	1,6	1,8	2,2	2,8	3,5
«	125,0	«	250,0	«	1,2	1,4	1,6	1,8	2,2	2,8	3,5	4,0

In places of transition for radii up to 10 mm allowed to assign twice the value of the residual dross.

5.9. The magnitude of the cut edges do not need to reduce the prescribed allowance.

5.10. The allowable value of the height of the Burr on the forging along the contour of the trim fin should not exceed:

	2 mm	-	for	forgings	weight	to	1.0 kg	incl.;
	3 mm		«	«	«	St.	1.0 kg	to	5.6 kg	incl.;
	5 mm		«	«	«	«	5.6 kg	«	50.0 kg	«;
	6 mm		«	«	«	«	50.0 kg,

and in the case of perforation holes, this value may be increased in 1.3 times.

5.11. The allowable value of the Burr formed along the contour of the punch when punching in the closed stamps (bezoblachnoe), is determined by the table.11.

Table 11

Forging weight, kg	The degree of difficulty of forging	The allowable value of the Burr with a maximum cross-sectional dimension of the forging at the parting surface of the stamp, mm
		up to 40	40−100	100−160	160−250	over 250
0.5 incl.	C1, C2	1,0	2,0	-	-	-
	C3	2,0	3,0	-	-	-
	C4	3,0	4,0	-	-	-
SV. 0,5 «3,2 «	C1, C2	2,0	3,0	4,0	-	-
	C3	3,0	4,0	5,0	-	-
	C4	4,0	5,0	6,0	-	-
«3,2» 5,6 «	C1, C2	3,0	4,0	5,0	-	-
	C3	4,0	5,0	6,0	-	-
	C4	5,0	6,0	7,0	-	-
«5,6» 20,0 «	C1, C2	4,0	5,0	6,0	7,0	8,0
	C3	5,0	6,0	7,0	8,0	9,0
	C4	6,0	7,0	8,0	9,0	10,0
«20,0» 50,0 «	C1, C2	5,0	6,0	7,0	8,0	9,0
	C3	6,0	7,0	8,0	9,0	10,0
	C4	7,0	8,0	8,0	10,0	11,0
«50,0	C1, C2	6,0	7,0	9,0	9,0	10,0
	C3	7,0	8,0	9,0	10,0	11,0
	C4	8,0	9,0	10,0	11,0	12,0

5.12. From forgings made on horizontal forging machines permitted height of Burr in the plane of the contact matrix should not exceed twice the size of a residual dross at the table.10.

5.13. Burrs on machined surfaces of forgings shall be removed at the request of the consumer, if the form of forging allows in technically justified cases, cleaning of the surface grinding machines.

5.14. Permissible deviation from coaxiality non-penetration holes (pointers) to forging (see the devil.4G) is taken not more than 1.0% of the depth of the hole (outline).

5.15. The permissible maximum deviation from concentricity in forging the punched holes (see the devil.4B) is set at the table.12.

Table 12

mm

The largest size of the forgings	The permissible maximum deviation from concentricity of the punched holes for accuracy classes
	T1	T2	T3	T4	T5
Up to 100 incl.	0,4	0,5	0,6	0,8	1,0
SV. 100 «160 «	0,5	0,6	0,8	1,0	1,5
«160» 250 «	0,6	0,8	1,0	1,5	2,0
«250» 400 «	0,8	1,0	1,5	2,0	2,5
«400» 630 «	1,0	1,5	2,0	2,5	3,0
«630» 1000 «	1,5	2,0	2,5	3,0	4,0

Given the allowable deviation from concentricity of the holes correspond to the beginning of punching (on the input side of the punch in a forging). At the end of the punching (on the output side of the punch) these variances can be increased by 25%.

5.16. Tolerances of curvature, flatness and straightness for flat surfaces (see the devil.7) are set according to the table.13. These values are not taken into account differences in height, thickness or width of the forgings.

Table 13

mm

	The largest size of the forgings	Tolerances of curvature for accuracy classes
		T1	T2	T3	T4	T5
	Up to 100 incl.	0,3	0,4	0,5	0,6	0,8
	SV. 100 «160 «	0,4	0,5	0,6	0,8	1,0
	«160» 250 «	0,5	0,6	0,8	1,0	1,2
	«250» 400 «	0,6	0,8	1,0	1,2	1,6
	«400» 630 «	0,8	1,0	1,2	1,6	2,0
	«630» 1000 «	1,0	1,2	1,6	2,0	2,5
	«1000» 1600 «	1,2	1,6	2,0	2,5	3,2
	«1600» 2500 «	1,6	2,0	2,5	3,2	4,0

Dinomania forgings with dimensions over 1000 mm is subjected to edit before mechanical treatment.

5.17. Tolerance of radial runout of the cylindrical surface should not exceed twice the value shown in table.13 (appointed by agreement between the manufacturer and the customer).

5.18. Tolerance center distance (in) forgings (see the devil.2) must not exceed the values given in table.14.

Table 14

mm

Center-to-center distance	Acceptable deviation in center distance for accuracy classes
	T1	T2	T3	T4	T5
Up to 60 incl.	±0,10	±0,15	±0,20	±0,25	±0,30
SV. 60 «100 «	±0,15	±0,20	±0,25	±0,30	±0,50
«100» 160 «	±0,20	±0,25	±0,30	±0,50	±0,80
«160» 250 «	±0,25	±0,30	±0,50	±0,80	±1,20
«250» 400 «	±0,30	±0,50	±0,80	±1,20	±1,60
«400» 630 «	±0,50	±0,80	±1,20	±1,60	±2,00
«630» 1000 «	±0,80	±1,20	±1,60	±2,00	±3,00
«1000» 1600 «	±1,20	±1,60	±2,00	±3,00	±4,50
«1600» 2500 «	±1,60	±2,00	±3,00	±4,50	±7,00

5.19. Tolerance center distance (in) the forging (see the devil.3) is established by agreement between the consumer and the manufacturer.

5.20. Tolerance end of the rod forgings after parting off workpieces from bar, not subjected to deformation during stamping (Fig.10), is determined by the table.15 depending on the diameter of the rod. Allowed any crooked areas of the surface of the slice to the axis of the workpiece to 7°.

Damn.10

Table 15

mm

The diameter of the rod ()	Tolerance
To 40 incl.	0,08	1
SV. 40	0,07	0,8

5.21. The allowable deviation angle () of the element sizes forging (damn.11) are set at the table.16.

 — element length (distance from the axis of the forgings to end of element)

Damn.11

Table 16

mm

Item length (mm)	The permissible deviations of angular elements of forgings for accuracy classes
	T1	T2	T3	T4	T5
Up to 25 incl.	±0°45'	±1°00'	±1°30'	±2°00'	±2°30'
SV. 25 «60 «	±0°30'	±0°45'	±1°00'	±1°30'	±2°00'
«60» 100 «	±0°15'	±0°30'	±0°45'	±1°00'	±1°30'
«100» 160 «	±0°10'	±0°15'	±0°30'	±0°45'	±1°00'
«160	±0°05'	±0°10'	±0°15'	±0°30'	±0°45'

The permissible deviations for angular dimensions of the forging, twisting or bending which is performed on separate hardware, increase by 50%.

5.22. The forging is allowed to trail in the form of a depression or protrusion formed from the ejector or from the clamping elements of the stamp.

The depth of the depression should be no more than 0.5 magnitude of the actual surplus. The height of the projection is allowed up to 3.0 mm on the treated surface and untreated surfaces should be agreed between manufacturer and user.

5.23. The tolerance of the radii of curvature of the inner and outer corners of the forgings is established according to table.17.

Table 17

mm

The radius of curvature	The tolerance of the radii of curvature for accuracy classes
	T1	T2	T3	T4	T5
To 4 incl.	0,5	0,5	0,5	1,0	2,0
SV. 4 «6 «	0,5	0,5	1,0	2,0	3,0
«6» 10 «	1,0	1,0	2,0	3,0	5,0
«10» 16 «	1,0	2,0	3,0	5,0	8,0
«16» 25 «	2,0	3,0	5,0	8,0	12,0
«25» 40 «	3,0	5,0	8,0	12,0	20,0
«40» 60 «	5,0	8,0	12,0	20,0	30,0
«60» 100 «	8,0	12,0	20,0	30,0	50,0

5.24. The allowable deviation of forged pipe forgings shall be placed within ±0,25 their nominal value.

5.25. Tolerance of height (length) of the rod, bushing and process of the forgings manufactured by extrusion, established by agreement between manufacturer and user.

5.26. The permissible deviations of form and position of surfaces (PP.5.7−5.17, 5.20, 5.22−5.24) are independent and do not depend on the tolerances and permissible deviations of the sizes of forgings.

6. FORGING LAP

6.1. Forging the overlaps can be formed on the forging and stamping gradients, radii, internal angles, bulletproof jumper in the holes and unrealistic in stamping operations with and undercut cavities.

6.2. Punching the slopes is not to exceed quantities established in table.18.

Table 18

Equipment	Stamping gradients, grad
	on the outer surface	on the inner surface
Forging hammers, presses without ejectors	7	10
Press ejectors, horizontal boring machines	5	7
Hot-stamping machines	1	2

On the surfaces of holes in forgings made on horizontal forging machines, stamping slope should not exceed 3°.

Have made in forging hammers and presses without ejectors forgings, having elements in the form of a rib, protrusion, flange with respect to their height to width ratio more than 2.5 allowed a stamping gradient to 10° at the surface and 12° on the inner surface.

6.3. The value of the radius of curvature of the inner corners is set by agreement between the manufacturer and the consumer.

6.4. Cavities and recesses in the forging having their axes parallel to the direction of movement of one of the movable parts of the stamp, and the diameter or minimum transverse dimension not less than 30 mm, perform a depth of up to 0.8 of their diameter or least transverse dimension is in the manufacture of hammers and presses and to three diameters — the production on horizontal forging machines.

6.5. In the forging performed through holes for two-sided recess, if when making their axes parallel to the direction of movement of one of the movable parts of the stamp, the diameter of the through hole at least 30 mm, and the thickness of the forging at the place of punch — no more than the diameter of the punched holes.

ANNEX 1 (recommended). SELECTION OF ACCURACY CLASS OF FORGINGS

ANNEX 1
Recommended

Table 19

The main deforming equipment and technological processes	Accuracy class
	T1	T2	T3	T4	T5
Hot-stamping crank press:
open (oblina) stamping				+	+
closed die forging		+	+
squeezing			+	+
Horizontal forging machine				+	+
Screw press, hydraulic				+	+
Hot-stamping machines		+	+
Stamping hammers				+	+
Calibration volume (hot and cold)	+	+
Precision stamping	+
Notes: 1. Precision stamping — a method of forming, providing set accuracy and roughness of one or several functional surfaces of forgings, which are not subject to final machining. 2. When the fiery heat of the billet may reduce the accuracy for the classes T2-T4-on-one class. 3. When cold or hot planar calibration accuracy is taken at one class higher.

ANNEX 2 (mandatory). COMPLEXITY OF FORGINGS

ANNEX 2
Mandatory

1. The degree of difficulty is one of the structural characteristics of the shapes of forgings, quality evaluates it, and is used when assigning allowances and tolerances.

2. The degree of difficulty is determined by calculating the ratio of the mass (volume) of forgings to the mass (volume) of geometric shapes that fits the shape of the forging. The geometric shape may be a ball, a parallelepiped, a cylinder perpendicular to its axis ends straight or right prism (Fig.12).

Damn.12

When calculating the relations take the geometric figures, the mass (volume) which is the smallest.

3. When determining the size of describing the forging geometric shapes is allowed to proceed from the increase of 1.05 times the overall linear dimensions of the part defining the position of its machined surfaces.

4. The degree of complexity of forgings correspond to the following numerical ratios :

	C1	-	St.	0,63
	S2		«	0,32	to	0,63	incl.
	C3		«	0,16	«	0,32	«
	C4		«	0,16

5. The degree of complexity of C4 is set for forgings with thin elements, for example, in the form of a disk, flange, ring (DWG.13), including with punched webs, and also for forgings with thin rod element, if the relationship is ; ; not exceed 0.20 and not more than 25 mm (where the largest size of the thin element, is the thickness of the thin element, is the length of the thin element, the diameter of the forgings, the thickness of which exceeds the value ).

Damn.13

6. For forgings received on horizontal forging machines allowed to determine the degree of complexity of forms, depending on the number of transitions:

C1 — no more than two transitions;

C2 — for three transitions;

C3, with four crossings;

C4 — more than four transitions or the production on two forging machines.

APPENDIX 3 (recommended). The COEFFICIENT K® TO determine the APPROXIMATE ESTIMATED weight of FORGINGS

APPENDIX 3
Recommended

Coefficient to determine the approximate estimated weight of forgings

Table 20

Group	Feature details	Typical representatives
1	Elongated
1.1	With a straight axle	Shafts, axis, axles, cranks	1,3−1,6
1.2	With a curved axis	Levers, Pitman arm a steering	1.1 to 1.4
2	Round and multi-faceted in terms of
2.1	Round	Gears, hubs, flanges	1,5−1,8
2.2	Square, rectangular, multi-faceted	Flanges, hubs, nuts	1,3−1,7
2.3	With spikes	Crosses, plugs	1,4−1,6
3	Combined (combining elements of groups 1 and 2) configuration	Bearing housings, crankshafts	1,3−1,8
4	With the large amount of uncultivated surfaces	I-beam front axles, levers, switch boxes	1.1 to 1.3
5	With holes, recesses, undercut, not issued in forging in forging	Hollow shafts, flanges, gear sets	1,8−2,2

ANNEX 4 (required). TOLERANCES AND ALLOWANCES FOR THICKNESS OF FORGINGS SUBJECTED TO HOT AND COLD CALIBRATION

ANNEX 4
Mandatory

1. During cold calibration the machining allowances forging tolerances and the thickness between the calibrated planes is determined by the table.21.

Acceptable deviation is taken equal to half of the tolerance field.

Table 21

The surface area subjected to the calibration, see	Allowance, mm	When tolerance *, mm
		0.5 incl.	St. 0,5
Up to 2.5 incl.	0,25	0,32	0,26
SV. 2,5 «6,3 «	0,30	0,36	0,32
«A 6.3» 10,0 «	0,36	0,40	0,36
«10,0» 16,0 «	0,40	0,44	0,40
«16,0» 25,0 «	0,50	0,50	0,44
«25,0» 40,0 «	0,60	0,60	0,50
«40,0» 80,0 «	0,70	0,80	0,60

_______________
* The ratio of the thickness (the distance between the calibrated planes) to the width of the forgings are subjected to calibration or element.

1.1. Simultaneous calibration of multiple planes of the forging surface area that is subjected to calibration, is defined as their sum. Tolerances and permissible deviations are established on all calibrated items at the lower .

1.2. When the hot calibration allowances and tolerances on the thickness of the forgings can be increased to 1.5 times.

2. Width, length and diameter of forgings or parts that change when the calibration set by agreement between manufacturer and user. The magnitude of the unilateral increase in the dimensions should not exceed the double of a positive deviation and decreased double negative deviation to calibration.

3. Deviations from parallelism, flatness and straightness calibration planes are allowed within a tolerance size after calibration.

ANNEX 5 (reference). EXAMPLES OF CALCULATION (DESTINATION) TOLERANCES AND PERMISSIBLE DEVIATIONS AND ALLOWANCES ON FORGINGS

ANNEX 5
Reference

Example 1

The drive gear (Fig.14).

Damn.14

Stamping equipment — hot-stamping machine.

Heating of billets induction.

1. The source data for details

1.1. Material — steel 30XMA (GOST 4543): 0,17−0,37% Si; 0,26−0,33%; 0,4−0,7% MP; 0,8−1,1% SG; 0.15% to 0.25% Mo.

1.2. The mass of the part and 0.390 kg.

2. Initial data for calculation

2.1. Forging weight (estimated) — 0,620 kg;

the estimated coefficient (see Annex 3) — 1,6;

0,390х1,6=0,620 kg.

2.2. Accuracy class — T3 (see Appendix 1).

2.3. Steel panel — M1 (see table.1).

The average mass fraction of carbon in the steel 30KHMA 0.3%, and the total mass fraction of alloying elements and 1.9% (0,27% Si; 0.55% of Mn; 0,95% Cr; 0,25% Mo).

2.4. Degree of difficulty — C1 (see Annex 2).

Dimensions describe the forging shape (cylinder), mm:

diameter — 63 (60х1,05);

length is 32.5 (31х1,05) (1,05 — coefficient).

Weight describing figures (estimated) — 0,780 kg;

.

2.5. The configuration of the parting surface of the stamp, P (flat) — (see table.1).

2.6. Source index — 6 (see table.2).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

1,0 — diameter of 60 mm and a surface finish of 6.3;

1.0 — hub diameter of 34 mm and a surface finish of 0.8;

1,0 — thickness 31 mm, surface finish of 6.3;

1,1 — thickness 31 mm and a surface finish of 0.8;

0.9 and the thickness of 21 mm and a surface finish of 6.3.

3.2. An additional allowance that takes into account the deviation from flatness — 0.2 mm (see table.14).

4. The dimensions of the forgings and their permissible deviations (see the devil.15)

Damn.15

4.1. The dimensions of the forging, mm

diameter 60+1. 0x2=62	accepted	62;
a diameter of 34+1. 0x2=36	«	36;
thickness 21+(0,9+0,2)x2=23,2	«	23;
thickness 31+1,0+1,1+0 that 2x2=33,5	accepted	33,5.

4.2. The radius of the outer corners — 2.0 mm (minimum) shall be adopted by 3.0 mm (see table.7).

4.3. Permissible tolerances (see table.8), mm:

diameter

hub diameter

thickness

«

4.4. Unspecified limit deviations of dimensions according to claim 5.5.

4.5. The unspecified tolerances of radii, — according to claim 5.23.

4.5. Permitted height of the mechanical Burr — 3.0 mm (see table.11).

4.7. Permissible deviation from flatness of 0.5 mm (see table.13).

Example 2

Gear (damn.16).

Damn.16

Stamping equipment KGSP.

Induction heating preforms.

1. The source data for details

1.1. Material — steel 45KHN2MFA (GOST 4543): 0,42−0,50%; 0,17−0,37% Si; 0,5−0,8% Mn; 0,8−1,1% Cr; 1,3−1,8% Ni; 0.2−0.3% of Mo; 0,10−0,18% V.

1.2. The mass of the part — of 1.83 kg.

2. Initial data for calculation

2.1. Forging weight — 3.3 kg (calculated):

estimated coefficient =1,8 (see Annex 3);

1,83х1,8=3.3 kg.

2.2. Accuracy class — T3 (see Appendix 1).

2.3. Steel panel in M2 (see table.1).

The average mass fraction of carbon in the steel 45KHN2MFA 0,46%; total mass fraction of alloying elements — 3,81% (0,27% Si; 0.65% of Mn; 0,95% Cr; at 1.55% Ni; 0.25% of Mo; 0.14 percent V).

2.4. Degree of difficulty — C1 (see Annex 2).

Dimensions describe the forging shape (cylinder), mm:

diameter 134,2 (127,8x1,05);

height 41 (39х1,05) (1,05 — coefficient).

Weight describing figures (estimated) — 4,55 kg;

.

2.5. The configuration of the parting surface of the stamp, P (flat) — (see table.1).

2.6. Original index — 10 (see table.2).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

1,6 — diameter of 127.8 mm and a surface finish of 6.3;

1.4 — 36 mm in diameter, surface finish of 6.3;

1,5 — thickness of 39 mm and a surface finish of 1.6;

1,5 — thickness of 28 mm and a surface finish of 6.3.

3.2. Additional allowances, taking into account:

offset parting surface of the stamp — 0.3 mm (see table.4);

the deviation from flatness is 0.3 mm (see table.5).

3.3. Stamping bias:

on the outer surface is not more than 5° is taken as 5°;

on the inner surface is not more than 7° was adopted by 7°.

4. The dimensions of the forgings and their permissible deviations (Fig.17)

Damn.17

4.1. The dimensions of the forging, mm

the diameter of 127.8+(1,6+0,3)x2=131, 6mm accepted 132;

diameter 36-(1,4+0,3)x2=32,6 accepted 32;

thickness 39+(1,5+0,3)x2=42,6 42,5 accepted;

thickness 28+(1,5+0,3)x2=31,5 31,6 accepted.

4.2. The radius of the outer corners — 2.0 mm (minimum) shall be adopted by 3.0 mm (see table.7).

4.3. Permissible tolerances (see table.8), mm:

diameter

«

thickness

«

4.4. Unspecified limit deviations of dimensions (e.g., diameter (86,5±1,1) mm) — according to claim 5.5.

4.5. The unspecified tolerances of radii, — according to claim 5.23.

4.6. Permissible value of the residual fin 0.7 mm — according to claim 5.8.

4.7. Permissible deviation from flatness 0,6 mm according to claim 5.16.

4.8. The acceptable deviation from concentricity of the punched hole relative to the outer contour of the forgings 0.8 mm (see table.12).

4.9. Allowable offset parting surface of a stamp of 0.6 mm (see table.9).

4.10. Allowable Burr height of 3.0 mm according to claim 5.10.

Example 3

The propeller shaft yoke (Fig.18).

Damn.18

Stamping equipment KGSP.

Heating of billets induction.

1. The source data for details

1.1. Material — steel 45 (GOST 1050): 0,42−0,50%; 0,17−0,37% Si; 0,50−0,80% Mn; 0.25% Cr.

1.2. The mass of the part — 0,845 kg.

2. Initial data for calculation

2.1. Forging weight (estimated) — 1.27 kg;

estimated coefficient =1,5 (see Annex 3);

0,845х1,5=1.27 kg.

2.2. Accuracy class — T3 (see Appendix 1).

2.3. Steel panel in M2 (see table.1).

The average mass fraction of carbon in steel 45 — 0,46%.

2.4. Degree of difficulty — S2 (see Annex 2).

Dimensions describe the forging shape (parallelepiped), mm:

100x100 — side (determined graphically);

The 36 — height (specify on drawing).

Weight describing figures (calculated) — of 2.56 kg;

.

2.5. The configuration of the parting surface of the stamp — P (flat) (see table.1).

2.6. Source index — 9 (see table.2).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

The 1.5 — width 108,6 mm and a surface finish of 3.2;

1,3 — thickness of 25.6 mm and a surface finish of 3.2;

A 1.3 length of 30.3 mm and a surface finish of 3.2.

3.2. Additional allowances, taking into account:

offset parting surface of the stamp — 0.2 mm (see table.4);

the deviation from flatness is 0.3 mm (see table.5).

3.3. Stamping gradient on the outer surface of not more than 5° is assumed to be 3° C (see table.17).

4. The dimensions of the forgings and their permissible deviations (Fig.19)

Damn.19

4.1. The dimensions of the forging, mm

width 108,6+(1,5+0,2+0,3)x2=in 112.6 accepted 112,5;

the thickness of 25.6+(1,3+0,2)x2=28,6 28,5 accepted;

length 30,3+1,3+0,3=31,9 32,0 accepted.

4.2. The radius of the outer corners — 2.0 mm (minimum) shall be adopted by 3.0 mm (see table.7).

4.3. Permissible tolerances (see table.8), mm:

width

thickness

length

4.4. Unspecified limit deviations of dimensions according to claim 5.5.

4.5. The unspecified tolerances of radii, — according to claim 5.23.

4.6. Permissible amount of residual burrs of 0.5 mm according to claim 5.8.

4.7. Permissible deviation from flatness 0,6 mm according to claim 5.16.

4.8. Permissible stamping inclines the axis of the forging processes of ±1° — according to claim 6.2.

4.9. Permissible displacement of the parting surface of the stamp 0,4 mm according to claim 5.7.

4.10. Allowable Burr 2.0 mm — according to claim 5.10.

Example 4

Bushing (DWG.20).

Damn.20

Stamping equipment KGSP.

Heating of billets induction.

1. The source data for details

1.1. Material — steel 65 (GOST 14959): 0,62−0,7% C; 0,5−0,8% Mn; 0,17−0,37% Si; up to 0.25% Cr.

1.2. Part mass is 5.4 kg.

2. Initial data for calculation

2.1. Forging weight (estimated) is 8.6 kg;

estimated coefficient =1,6 (see Annex 3);

5,4x1,6=8.6 kg.

2.2. Accuracy class — T3 (see Appendix 1).

2.3. Steel panel — M3 (see table.1).

The average mass fraction of carbon in the steel is 65: 0,68%; total mass fraction of alloying elements and 1.04% (0,27% Si; 0.65% of Mn; 0.12% Of Cr).

2.4. Degree of difficulty — C1 (see Annex 2).

Dimensions describe the forging shape (cylinder), mm:

147 (140х1,05) — diameter;

84 (80х1,05) — length (where 1,05 — coefficient).

Weight describing figures (estimated), and 11.2 kg;

.

2.5. The configuration of the parting surface of the stamp — P (flat) (see table.1).

2.6. Original index — 12 (see table.2).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

A 1.5 — diameter of 140 mm and surface finish of 12.5;

1.8 diameter of 120 mm and a surface finish of 1.6;

2.0 — the thickness of 80 mm and a surface finish of 6.3;

1.7 — 80 mm thick and surface finish of 12.5;

1,6 — 12 mm and surface finish of 1.6;

The 1.7 is the diameter of the trench 65 mm and a surface finish of 6.3;

1.7 — valley depth 60 mm and surface finish of 12.5.

3.2. Additional allowances, taking into account:

the deviation from flatness is 0.3 mm (see table.5);

offset parting surface of the stamp — 0.3 mm (see table.4).

3.3. Stamping bias (see table.8):

on the outer surface is not more than 5° is accepted — 3°;

on the inner surface is not more than 7° taken to 7°.

4. The dimensions of the forgings and their permissible deviations (Fig.21)

Damn.21

4.1. The dimensions of the forging, mm

diameter 140+(1,5+0,3)x2=143,6 144 is adopted;

diameter of 120+(1,8+0,3)x2=is taken to 124.2 124;

diameter 65 — (1,7+0,3)x2=61 61 is taken;

thickness 80+1,7+2+0,3x2=84 84 is adopted;

thickness 12+1,7+1,6+0,3x2=15,9 16 is taken;

depth (see section 6.4) 60х0,8=48,8 accepted 50.

4.2. The radius of the outer corners (see table.7) on the cavity depth of the stream of the stamp, mm:

to 50 — at least 3 taken 5;

over 50 «" 3 «4.

4.3. Permissible tolerances (see table.8), mm:

diameter

«

«

depth

thickness

«

4.4. The unspecified tolerances of radii, — according to claim 5.23.

4.5. Permissible deviation from flatness 0,6 mm according to claim 5.16.

4.6. Permissible amount of residual burrs 0.8 mm — according to claim 5.23.

4.7. Permissible deviation from parallel alignment recesses 50х0,01=0,5 mm, 0.5 mm, according to claim 5.14.

4.8. The permissible value for the displacement of the parting surface of the stamp is 0.7 mm according to claim 5.7.

Example 5

The lever (DWG.22).

Damn.22

Stamping equipment — stamping steam-air hammer.

Heating of billets — fiery gas.

1. The source data for details

1.1. Material — steel 12KH2N4A (GOST 4543): 0,09−0,15%; 0,17−0,3% Si; 0,30−0,60% Mn; 1,25−1,65% Cr; 3,25−3,65% Ni.

1.2. Workpiece weight — 3,30 kg.

2. Initial data for calculation

2.1. Forging weight (estimated) — 4.25 kg;

the estimated coefficient of=1.3 (see Annex 3);

3,30х1,3=4,25 kg.

2.2. Accuracy class T5 (see Annex 1).

2.3. Steel panel — M3 (see table.1).

The average mass fraction of carbon in the steel 12KH2N4A: 0,12%; total mass fraction of alloying elements — of 5.62% (0,27% Si; 0.45% of Mn; About 1.45% Cr; 3,45% Ni).

2.4. Degree of difficulty — S2 (see Annex 2).

Dimensions describe the forging shape (parallelepiped), mm:

length 340 (determined graphically);

height 67 (determined graphically);

width 67 (determined by drawing).

Weight describing figures (estimated):

1,03х34 cm X6. 7 cm X6. 7 cm X7,85 g/cm=12420 g =12,42 kg;

.

2.5. The configuration of the parting surface of the stamp (curved symmetrical) (see table.1).

2.6. Source index — 16 (see table.2).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

2,7 — thickness of 50 mm and surface finish of 2.2;

2.5 — 35 mm thickness and surface finish of 3.2;

2,5 — 40 mm diameter and a surface finish of 1.6;

2,3 — diameter 28 mm and a surface finish of 1.6.

3.2. Additional allowances, taking into account:

displacement of the forging at the parting surface of the stamp (see table.13), mm:

0,6 — diameter 40;

A 0.6 «28;

deviation from straightness (see table.5) mm:

0,8 — width 50;

0,8 «35;

deviation of distances between centers size 245 mm — 1.2 mm (see table.6).

3.3. Stamping bias (see table.18):

on external surface not more than 7° was adopted by 7°;

on the inner surface is not more than 10° was adopted by 10°.

4. The dimensions of the forgings and their permissible deviations (Fig.23)

Damn.23

4.1. The dimensions of the forging, mm

thickness 50+(2,7+0,8)x2=57 57 is accepted;

thickness 35+(2,5+0,8)x2=41,6 41,5 accepted;

diameter 40-(2,5+0,6+1,2)x2=31,4 31 accepted;

diameter 28-(2,3+0,6+1,2)x2=19,5 19,4 accepted;

height 100+(2,7−2,5)=100,2 accepted 100.

4.2. The radius of the outer corners for depth of the stream 10−25 mm — 2.0 mm (see table.7).

4.3. Permissible tolerances (see table.8), mm:

thickness			height
«			length
width			diameter
«			«

4.4. Unspecified limit deviations of dimensions according to claim 5.5.

4.5. The unspecified tolerances of radii, — according to claim 5.23.

4.6. Permissible displacement of the parting surface of the stamp 1.2 mm — according to claim 5.7.

4.7. Permissible deviation from flatness and straightness of 1.6 mm according to claim 5.16.

4.8. Permissible amount of residual burrs or edges of cut 1.6 mm — according to claim 5.8.

4.9. Tolerance center-to-center distances ±1.2 mm (see table.14).

Example 6

Sprocket drive (Fig.24).

Damn.24

Stamping equipment KGSP.

Heating of the billet is induction.

1. The source data for details

1.1. Material — steel 35 (GOST 1050): 0,32−0,40%; 0,17−0,37% Si; 0,50−0,80% Mn; 0.25% Cr.

1.2. Part mass is 2.05 kg.

2. Initial data for calculation

2.1. Forging weight (calculated) of 3.28 kg;

estimated coefficient =1,6 (see Annex 3);

2,05х1,6=3,28 kg.

2.2. Accuracy class — T4 (see Annex 1).

2.3. Steel panel — M1 (see table.1).

The average mass fraction of carbon in the steel 35: 0,36% S.

2.4. Degree of difficulty — C4 (see Annex 2).

The ratio of the thickness of the blade to the diametrical size:

2.5. The configuration of the parting surface of the stamp — P (flat) (see table.1).

2.6. Source index — 14 (see table.14).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

A 2.0 — mm diameter 179,25 and surface finish of 12.5;

2,2 — diameter of 42 mm and a surface finish of 0.8;

1.7 — 38 mm thick and the surface finish of 12.5;

1,5 — thickness of 8.8 mm and a surface finish of 12.5.

3.2. Additional allowances, taking into account:

the deviation from flatness is 0.3 mm (see table.5);

offset parting surface of the stamp — 0.3 mm (see table.4).

4. The dimensions of the forgings and their permissible deviations (Fig.25).

Damn.25

4.1. The dimensions of the forging, mm

diameter 179,25+(2,0+0,5+0,3)x2=184,85 accepted 185;

diameter of 42+(2,2+0,5+0,3)x2=48,0 accepted 48;

the thickness is 38+(1,7+0,5)x2=42,4 42,5 accepted;

thickness of 8.8+(1,5+0,5)x2=12,8 13,0 accepted.

4.2. The radius of the outer corners — 2.0 mm (minimum) of 3.0 was adopted (see table.7).

4.3. Permissible tolerances (see table.8), mm:

diameter

«

thickness

«

4.4. Unspecified limit deviations of dimensions according to claim 5.5.

4.5. The unspecified tolerances of radii, — according to claim 5.23.

4.6. Permissible amount of residual burrs 1.0 mm — according to claim 5.16.

4.7. Permissible deviation from flatness and straightness of 0.9 mm according to claim 5.8.

4.8. Permissible displacement of the parting surface of the stamp is 0.7 mm according to claim 5.7.

4.9. Allowable Burr 2.0 mm — according to claim 5.10.

Example 7

The axle shaft (Fig.26).

Damn.26

Stamping equipment horizontal forging machine.

The number of transitions is 5.

Heating of billets induction.

1. The source data for details

1.1. Material — steel 45G (GOST 4543): 0,12−0,50% C; 0,7−1,0% Mn; 0,17−0,37% Si.

1.2. Workpiece weight — 16.5 kg.

Weight of the flange with the clamping piece is 6.5 kg.

2. Initial data for calculation

2.1. Forging weight (estimated) — 9,8/6,0 kg.

The estimated coefficient (see Annex 3);

for flange — 1,5;

for splined end — 1,3.

Weight of the flange with the clamping part 6,5x1,5=9,8 kg.

The mass of the slotted end with a clamping part:

4,6x1,3=6.0 kg.

2.2. Accuracy class — T4 (see Annex 1).

2.3. Steel panel in M2 (see table.1).

The average mass fraction of carbon in the steel 45G: 0,46%; total mass fraction of alloying elements: 1,12% (0,27% Si; 0,85% Mn).

2.4. Degree of difficulty — C4 (see Annex 2).

2.5. The configuration of the parting surface of the stamp — P (flat) (see table.1).

2.6. Source index — 16 (see table.2).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

The 3.0 — diameter of 195 mm and a surface finish of 6.3;

2.5 diameter of 56 mm and a surface finish of 1.6;

2,3 — 12 mm and surface finish of 6.3;

2.5 — 12 mm and surface finish of 3.2;

2.5 — 32 mm thick and a surface finish of 3.2;

2.4 — 100 mm thickness and surface finish of 12.5.

3.2. Additional allowances, taking into account:

offset parting surface of the stamp — 0.3 mm (see table.14);

curved, deviation from flatness and straightness (see table.5) mm:

0,5 — diameter 195;

0,3 «56.

4. The dimensions of the forgings and their permissible deviations (Fig.27)

Damn.27

4.1. The dimensions of the forging, mm

diameter 195+(3,0+0,3+0,5)x2=202,6 accepted 202,5;

diameter 56+(2,5+0,3+0,3)x2=62,2 62 is taken;

thickness 12+(2,3+0,5)+(2,5+0,3+0,5)=18,1 adopted 18;

thickness 32+(2,5+0,3+0,5)=35,3 accepted 35,5;

thickness 100+(2,4+0,3)=102,7 103 was adopted;

length 850+(2,4+0,3) — (2,5+0,3+0,5)=849,4 accepted 849,5.

4.2. The radius of the outer corners (see table.7), mm:

flange — 3,0;

slotted end — 4,0.

4.3. Permissible tolerances (see table.8), mm:

diameter

«

thickness

«

«

diameter (GOST 2590*).
________________
* On the territory of the Russian Federation the document is not valid. Standards 2590−2006, here and hereafter. — Note the manufacturer’s database.

4.4. Unspecified limit deviations of dimensions according to claim 5.5.

4.5. The unspecified tolerances of radii, — according to claim 5.23.

4.6. Permitted height of the mechanical Burr (see table.11), mm:

flange — 9;

slotted end — 7.

4.7. Allowable height of a Burr in the plane of the connector matrix 2.0 mm — according to claim 5.12.

4.8. The permissible deviation of curvature, flatness and straightness (see table.13), mm:

flange — 1,0;

slotted end — 0,6;

all forgings to 2.0.

4.9. The permissible amount of displacement on the surface of the stamped connector 0.8 mm (see table.9).

4.10. Allowable increase in diameter of the rod at a distance of 100 mm from the flange and spline end to 54.8 mm — according to claim 5.6.

Example 8

The input shaft (Fig.28).

Damn.28

Stamping equipment horizontal forging machine.

The number of transitions — 4.

Heating of billets — flaming.

1. The source data for details

1.1. Material — steel 15KHGN2TA (GOST 4543): 0,13−0,18% C; 0,7−1,0% Mn; 0,17−0,37% Si; 0,7−1,0% Cr; 1,4−1,8% Ni; 0,03−0,09% Ti.

1.2. Workpiece weight — 6.6 kg.

The mass is deformable and the clampable pieces — 5.2 kg.

2. Initial data for calculation

2.1. Forging weight (estimated) — 7.8 kg;

estimated coefficient =1,5 (see Annex 3);

5,2x1,5=7,8 kg.

2.2. Accuracy class T5 (see Annex 1).

2.3. Steel panel in M2 (see table.1).

The average mass fraction of carbon in the steel 15KHGN2TA: 0,15%; total mass fraction of alloying elements — 3,73% (0,9% Mn; 0.27% of Si; 0.9% of Cr; 1.6% of Ni; 0,06% Ti).

2.4. Degree of difficulty — C3 (see Annex 2).

2.5. The configuration of the parting surface of the stamp — P (flat) (see table.1).

2.6. Original index — 17 (see table.12).

3. Allowances and forging lap

3.1. Basic allowances for sizes (see table.3), mm:

The 3.0 — diameter of 126 mm and a surface finish of 6.3;

2,7 — diameter of 86 mm and a surface finish of 6.3;

2.7 — a diameter of 60 mm and a surface finish of 1.6;

2,2 — diameter 45 mm and surface finish of 12.5;

The 3.0 — thickness of 52 mm and a surface finish of 6.3;

3,3 — thickness of 52 mm and a surface finish of 0.8;

The 3.0 — thickness of 50 mm and a surface finish of 6.3;

2.4 — thickness of 50 mm and surface finish of 12.5;

3,0 depth of 40 mm and a surface finish of 6.3;

2.0 — the depth of 40 mm and a surface finish of 12.5.

3.2. Additional allowances, taking into account:

offset parting surface of the stamp is 0.4 mm (see table.4);

curved, deviation from flatness and straightness (see table.5) mm:

web — 0,8;

flange 0.5 in.

4. The dimensions of the forgings and their permissible deviations (Fig.29)

Damn.29

4.1. The dimensions of the forging, mm

diameter 126+(3,0+0,4+0,5)x2 =133.8 U.S. 134 accepted;

diameter 86-(2,7+0,4+0,5)x2 =78,8 78,5 accepted;

diameter 60+(2,7+0,5+0,4)x2 =67,2 67 accepted;

diameter 45+(2,2+0,8)x2 =51 was adopted by 52 (GOST 2590);

depth 40+(3,0−2,0+0,5) =41,5 accepted 41,5;

thickness 52+(3,0+3,3+0,5+0,4) =59,1 accepted 59,0;

thickness 50+(3,0+2,4+0,5+0,4) =56,2 56,0 accepted.

4.2. The radius of the outer corners of 4.0 mm (see table.7).

4.3. Stamping the slope is 7° (see table.18).

4.4. Permissible tolerances (see table.8), mm:

diameter
«
«
diameter		(GOST 2590);
height
thickness
«

4.5. Length tolerance rod 6.0 mm — according to claim 5.6.

4.6. Unspecified limit deviations of dimensions according to claim 5.5.

4.7. The unspecified tolerances of radii, — according to claim 5.23.

4.8. Allowable height of a Burr in the plane of the connector matrix of 2.4 mm according to claim 5.12.

4.9. Permitted height of the mechanical Burr 7.0 mm — according to claim 5.11.

4.10. Acceptable deviation:

from the flatness and straightness of 1.0 mm according to claim 5.16;

from the bent 1.6 mm (see table.13).

4.11. Permissible displacement of the parting surface of the stamp 1.0 mm (see table.9).

4.12. The deviation from coaxiality of the diameter of 78.5 (n.5.14) — 0.4 mm.

4.13. The allowable deviation of the stamping of drafts — p. 5.24 — (7±1,7)°.

4.14. Maximum increase in stem diameter up to 55.4 mm at a distance of 100 mm from head forgings (p.5.6).

4.15. Tolerance end of the rod (table.15), mm:

 — 3,1;

Is 36.5.

The slope of the cutoff is 7°.