GOST 7829-70

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  ГОСТ 7829-70

GOST 7829−70 Forgings from carbon and alloy steel, fabricated by hammer forging. Allowances and tolerances (Change No. 1)

GOST 7829−70

Group B03

INTERSTATE STANDARD

FORGINGS FROM CARBON AND ALLOY STEEL,
FABRICATED BY HAMMER FORGING

Allowances and tolerances

Cardon and alloyed steel forgings fabricated by hammer forging.
Allowances and tolerances

ISS 77.140.85
OKP 08 9300

Date of introduction 1971−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of heavy and transport engineering

2. APPROVED AND put INTO EFFECT by Decision of the Committee of standards, measures and measuring devices under Council of Ministers of the USSR from 15.01.70 N 60

3. REPLACE GOST 7829−55

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	Item number
GOST 8479−70	25

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

6. EDITION (December 2003) with amendment No. 1, approved in October 1987 (ICS 1−88)

1. This standard applies to forgings for General purposes, manufactured from carbon steel and alloy steel forging hammers with single and small batch production, and sets the size of the machining allowances of cutting, the value of the maximum deviations on the nominal dimensions of forgings, as well as the amount and conditions of appointment of overlaps for forgings.

The standard does not apply to forgings of high-alloy steels and alloys with special physical properties.

Special allowances on samples for mechanical testing, clamps for hanging them during heat treatment and for other technological purposes standard not set.

(Changed edition, Rev. N 1).

2. The shape and ratio of the size of forgings that are covered by this standard are shown in table.1.

3. Allowed the sphericity of the ends of the forgings that are made by the hood when there is trubka, the sphericity of the side surface of the forgings that are made by the draught, and also bevels between the ledges, Cocina Ruba at the ends, the taper or slope in the hole in the limits table.2 and 7−13.

4. The allowances established by this standard are assigned to the nominal dimensions of a part or pre-treated (stripped) of the workpiece, if the forging is subjected to heat treatment after the roughing.

Table 1

Type forgings	Sketch forgings	The ratio of the size	The number of the drawing and tables of allowances and limit deviations
Round, square and rectangular cross-sections is smooth			Damn.2, table 2
Round section with ledges			Damn.3, tab.2 and 3
Circular cross section with flange
Circular cross section with collar
Circular cross section with recess
Square cross section with ledges of the same types as the round cross-section
Round square cross section with ledges of different configurations
Drives			Damn.8, table.7
Cylinders
Bars, cubes, plates
Discs with hole
Sleeve
The rods and plates with a hole		;
Rolled rings			Damn.9, table.8
Cylinders with hole			Damn.10, table.9
The shafts are hollow			Damn.11, table.10 and 11
Sleeve with ridged solid and with holes made in the backing rings or backing dies*		; ; ;	Damn.12, 13, tab.3, 12 and 13

_______________
* Equipment for manufacture of forgings of the type of plugs with ledges is selected at the discretion of the manufacturer in terms of economic feasibility.


(Changed edition, Rev. N 1).

5. The scheme of allowances that are assigned to the outer dimensions of the part, and extreme deviations from the nominal size of forgings is shown in hell.1.

 — rough blank size or the nominal size of the part;  — the minimum stock size ;

 — nominal allowance for size ;

;

 — the minimum size of forgings:

;

 — nominal (calculated) size of forgings:

;

 — the maximum size of forgings:

;

 — the limit of deviation of the size of forgings

.

Damn.1

6. The magnitude of the allowances prescribed by this standard, should be assigned to the nominal dimensions of the parts in the calculation of the machining of forgings on both sides.

Maximum deviations are established on the nominal dimensions of the forgings.

7. Machined surfaces of the parts allowance should not be appointed, and the magnitude of extreme deviations should be determined by the tables of this standard depending on the type and dimensions of the forgings.

8. For parts to be processed on the one hand, the amount of the allowance is taken with a factor of 0.5 from table values. The magnitude of extreme deviations it should be taken as equal to the tabular values.

9. Allowances and limit deviations governed by this standard, established for the case of the manufacture of forgings from rolled steel or stripped of the ingot. When forging from ingot neurogennogo allowed to increase the allowance for a value of not more than 20% of the table value of allowances.

10. By agreement between manufacturer and consumer, it is possible the tightening of allowances, limit deviations and overlaps.

(Changed edition, Rev. N 1).

11. Allowed to round the calculated nominal dimensions of the forging to the nearest whole number in a big way.

12. The volume and weight of the forgings be determined based on their nominal dimensions, taking account of the overlaps on the slopes between the ledges, for bevel cuts, on the sphere and the taper hole.

13. Bevels from otrubki forgings must be free of burrs and must not interfere with the alignment.

14. Allowances and limit deviations for smooth forgings with round, square and rectangular section with length up to 6000 mm should be assigned in accordance with the devil.2 and table 2.

Damn.2

Table 2

mm

The length of the part	Component diameter or size of the cross section ,
up to 50	over 50 to 70	over 70 to 90	over 90 to 120	St 120 to 160	over 160 up to 200	over 200 to 250	over 250 to 300	over 300 to 360
Allowances (, , , ) and maximum deviations (;;;)
Up to 250	5±2	6±2	7±2	8±3	9±3	-	-	-	-
SV. 250 to 500	6±2	7±2	8±2	9±3	10±3	11±3	12±3	13±4	14±4
SV. 500 to 800	7±2	8±2	9±3	10±3	11±3	12±3	13±4	14±4	15±4
SV. 800 to 1200	8±2	9±3	10±3	11±3	12±3	13±4	14±4	15±4	16±4
SV. 1200 to 1700	-	10±3	11±3	12±4	13±4	14±4	15±4	16±5	17±5
SV. 1700 to 2300	-	11±3	12±3	13±4	14±4	15±4	16±5	17±5	18±5
SV. 2300 to 3000	-	-	13±4	14±4	15±4	16±5	17±5	18±5	19±5
SV. 3000 to 4000	-	-	-	15±5	16±5	17±5	18±5	19±5	20±6
SV. 4000 to 5000	-	-	-	16±5	17±5	18±5	19±5	20±6	21±6
SV. 5000 to 6000	-	-	-	-	18±5	19±5	20±6	21±6	22±6

Notes:

1. In the case of processing the surface of the part at the 4th and higher purity grade may be increased to a corresponding table value of allowances, but not more than 1 mm on a side.

2. Allowances and limit deviations for rectangular items are assigned depending on the largest dimension of the cross section.

(Changed edition, Rev. N 1).

15. Allowances and limit deviations for forgings of round and square cross-sections with ledges appointed basic and advanced.

Basic allowances and limit deviations should be appointed in accordance with the devil.3, tab.2 and the following requirements:

allowance and deviations in the diameter and size of the cross section is prescribed in table.2 depending on the total part length and diameter or dimension of the considered cross-section;

allowance for the total length of the part accept is 2.5 allowances on the diameter or size of the projection of the greatest cross-section;

maximum deviations for the total length of the part accept is 2.5 deviations on the diameter or size of the projection of the greatest cross-section;

allowances on length of ledges and ledges accept multiple of the allowance at the diameter or size of the protrusion section according to greatest features.3. While the length of the ledges and recesses in the drawing, forgings point from a single database. For the base accept the end of the projection of the greatest cross-section is not a end of the forging;

limit deviations of the length of the ledges and overhangs are equal to 1.5 deviations of the diameter or size of the protrusion section according to greatest features.3;

if the length between the notches before the forging of the recesses is less than the width of the striker is permitted, the increase in allowance and the limiting variance of 10% against the values table.2.

Damn.3

Additional allowance should be given according table.3 on the diameters (sizes) of all sections, except the main one, depending on the difference of the diameters (sizes) and see the most cuts, with the appointed main allowances.

Table 3

mm

The difference between the diameters (sizes) and most of the considered cross-sections	Up to 40	SV. 40 to 80	SV. 80 to 100	SV. 100 to 120	SV. 120 to 140	SV. 140 to 160	SV. 160 to 180	SV. 180
Additional allowance on diameter (size) , , …	3	4	5	6	7	8	9	10

The main section should be determined in the following order:

a) if the forging has a step from the machined surface for the main section take the stage with uncultivated surface;

b) if the forging does not have steps machined surface, in order to determine the main counting section area of the longitudinal sections of steps ; ; … and compare them with the square longitudinal cross-section of the projection with the largest diameter ;

if all the received values ; ; …less than , then for the main section, take the ledge with the greatest diameter;

if there is values ; ; …more than that , for those values of ; ; …more , counting value

*;

* etc.

and the main section take the section for which value has the highest value;

if the main section is not adopted the protrusion of the greatest diameter , the additional allowance is transferred from the primary section to the ledge of the greatest diameter.

________________
* Formulas correspond to the original. — Note the CODE.

An example of assignment of allowances and the marginal variance is given in Appendix (example 1).

16. The feasibility of the forging of end and intermediate ledges (Fig.4), seizures (Fig.5), flanges (DWG.7a) and clamps (Fig.7b) check after assigning the basic and additional allowances in accordance with table.4 subject to the following requirements:

Table 4

mm

Diameter (; ; ) or size () bench	Up to 100	SV. 100 to 180	SV. 180 up to 250	SV. 250
The minimum feasible height of the ledge (; ; )	4	5	6	7

a) end and intermediate ledges (Fig.4) is performed if their height ; ; ;… not less than the values given in table.4, and if their length ; ; with respect to the width of the striker is not less than the value specified in table.5;

Table 5

mm

The width of the striker	Up to 150	SV. 150 to 300	SV. 300
The minimum length achievable ledge (; ; )	0,3	0,4	0,5

At the same time:

if the height of ; ; ;… ledge less than the values shown in table.4, the ledge must be forged by the diameter of the adjacent ledge;

if the length of the ledge is less than the values given in table.5, it must be forged in the case where the amount of overlap when you bring it to a workable length is less than the amount of overlap when chipping off its diameter adjacent the ledge;

b) a recess (Fig.5) is performed, if the length between the notches (Fig.6) before the forging of the recesses in relation to the width of the striker is not less than the value specified in table.6;

Table 6

mm

The width of the striker	Up to 300	SV. 300 to 400	SV. 400
The minimum length of the section between the notches	0,5	0,7

if the length of the plot forgings, pricekamagra to perform excavation, less than specified in table.6, the diameter of the recess appoint the slouchy fit of the calculation to the length of presecki was equal to the corresponding value table.6;

in) flange (DWG.7a) perform, if its length is more than the height of the ledge , taken with coefficient of 1.2, but at least 0.2;

if the length of the flange is less than the height of the ledge , taken with coefficient of 1.2 or less than 0.2, then the length of the flange is adjusted to a feasible size due to the inlet or from the end or side of the ledge, proceeding from conditions of the minimum amount of overlap;

g) Burt (damn.7b) perform, if its length is more than the height of the lower adjacent ledge, but not less than 0.2;

if the length of pile less than the height of the lower surrounding ledge, or less than 0.2, then the length of the collar is adjusted to a feasible size due to the inlet by any of the ends from the condition that the amount of overlap was minimal.

Damn.4

Damn.5

Damn.6

Damn.7

An example of determining the feasibility of ledges, recesses, clamps and flanges are given in Appendix (example 1).

17. Allowances and limit deviations for forgings such as disks, cylinders, bushings, bars, cubes, plates and solid discs, sleeves, bars, plates with holes should be appointed in accordance with the devil.8 and table.7.

Damn.8

Table 7

mm

Component diameter or size of the cross section ;

The dimensions of the part to which the position examines the allowances and limit deviations

Elevation details

up to 50

over 50 up to 65

St. 65 to 80

over 80 to 100

over 100 to 125

St. 125 up to 150

St. 150 to 180

St. 180 to 215

St. 215 up to 250

over 250 to 300

over 300 to 360

Allowances (; ; ) and maximum deviations (;;)

Up to 50

6±2

6±2

7±2

-

-

-

-

-

-

-

-

; ;

6±2

6±2

7±2

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

SV. 50 to 80

6±2

7±2

8±2

9±2

9±2

-

-

-

-

-

-

; ;

7±2

7±2

8±2

9±2

9±2

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

SV. 80 to 110

7±2

8±2

8±2

9±2

10±3

11±3

12±3

-

-

-

-

; ;

8±2

8±2

9±2

10±2

10±2

11±3

12±4

-

-

-

-

14±2

15±2

15±2

16±2

16±2

17±3

18±4

-

-

-

-

SV. 110 to 150

7±2

8±2

8±2

9±2

10±3

11±3

12±3

13±4

14±5

-

-

; ;

9±2

9±2

10±2

11±3

11±3

12±4

13±4

14±5

14±5

-

-

15±2

16±2

16±2

17±3

17±3

18±4

19±4

20±5

20±5

-

-

SV. 150 to 200

7±2

8±2

8±2

9±2

10±3

11±3

12±3

13±4

14±5

15±5

-

; ;

10±3

10±3

11±3

12±4

12±4

13±4

13±4

14±5

14±5

15±5

-

16±3

17±3

17±3

18±4

18±4

19±4

19±4

20±5

21±5

22±5

-

SV. 200 to 250

8±3

9±3

9±3

10±3

11±4

12±4

13±4

14±5

15±6

16±6

17±6

; ;

11±3

11±3

12±3

13±4

13±4

14±4

14±4

15±5

16±6

17±6

18±6

17±3

18±3

18±3

19±4

19±4

20±4

20±4

21±5

22±6

23±6

24±6

SV. 250 to 300

9±3

10±3

10±3

11±3

12±4

13±4

14±4

15±5

16±6

17±6

18±6

; ;

12±4

12±4

13±4

14±5

14±5

15±5

15±5

16±6

17±7

18±7

19±7

18±4

19±4

19±4

20±5

20±5

21±5

21±5

22±6

23±7

24±7

25±7

SV. 300 to 360

9±3

10±3

10±3

11±3

12±4

13±4

14±4

15±5

16±6

17±6

18±6

; ;

13±4

13±4

14±4

15±5

15±5

16±5

16±5

17±6

18±7

19±7

20±7

19±4

20±4

20±4

21±5

21±5

22±5

22±5

23±6

24±7

25±7

26±7

SV. 360 to 420

10±3

11±4

11±4

12±4

13±5

14±5

15±5

16±6

17±7

18±7

19±7

; ;

14±5

14±5

15±5

16±6

16±6

17±6

17±6

18±7

19±8

20±8

21±8

20±5

21±5

21±5

22±6

22±6

23±6

23±6

24±7

25±8

26±8

27±8

SV. 420 to 485

10±3

11±4

11±4

12±4

13±5

14±5

15±5

16±6

17±7

18±7

19±7

; ;

15±5

15±5

16±5

17±6

17±6

18±6

18±6

19±7

20±8

21±8

22±8

21±5

22±5

22±5

23±6

23±6

24±6

24±6

25±7

26±8

27±8

28±8

SV. 485 to 550

-

12±4

12±4

13±4

14±5

15±5

16±5

17±6

18±7

19±7

20±7

; ;

-

16±6

17±6

18±7

18±7

19±7

19±7

20±8

21±9

22±9

23±9

-

23±6

23±6

24±7

24±7

25±7

25±7

26±8

27±9

28±9

29±9

SV. 550 to 620

-

13±5

13±5

14±5

15±6

16±6

17±6

18±7

19±8

20±8

21±8

; ;

-

17±6

18±6

19±7

19±7

20±7

20±7

21±8

22±9

23±9

24±9

-

24±6

24±6

25±7

25±7

26±7

26±7

27±8

28±9

29±9

30±9

SV. 620 to 700

-

14±6

14±6

15±6

16±7

17±7

18±7

19±8

20±9

-

-

; ;

-

18±7

19±7

20±8

20±8

21±8

21±8

22±9

23±10

-

-

-

25±7

25±7

26±8

26±8

27±8

27±8

28±9

29±10

-

-

Notes:

1. On cylindrical forgings having the ratio of the diameter to the height of more than 6 allowed sphericity, the value of which is not controlled.

2. You don’t need to flash the hole with a diameter of 40 mm and when the ratio of the height of the forging to the diameter of drilled holes .

3. In the bore of the forgings in excess of the allowances allowed slope of 1:20.

4. (Deleted, Rev. N 1).

5. Allowances and limit deviations for rectangular cross-section details is prescribed depending on the largest dimension of the cross section.

(Changed edition, Rev. N 1).


An example of assignment of allowances and the marginal variance is given in Appendix (example 2).

18. Allowances and limit deviations for forging such as rolled rings should be appointed in accordance with the devil.9 and table.8.

Damn.9

Table 8

mm

Diameter details

The detail sizes, which are assigned allowances and limit deviations

Elevation details

up to 50

over 50 up to 65

St. 65 to 80

over 80 to 100

over 100 to 125

St. 125 to 150

St. 150 to 180

St. 180 to 215

St. 215 to 250

over 250 to 300

over 300 to 360

Allowances (; ; ) and maximum deviations (;;)

To 110

6±2

7±2

8±3

9±3

10±3

-

-

-

-

-

-

9±3

10±3

11±3

12±4

12±4

-

-

-

-

-

-

12±3

13±3

14±3

15±4

15±4

-

-

-

-

-

-

SV. 110 to 150

7±2

8±2

9±3

10±3

11±4

12±4

-

-

-

-

-

10±3

11±3

11±3

12±4

13±4

14±4

-

-

-

-

-

13±3

14±3

14±3

15±4

16±4

17±4

-

-

-

-

-

SV. 150 to 200

7±2

8±2

9±3

10±3

11±4

12±4

13±5

14±5

-

-

-

11±3

12±3

12±3

13±4

13±4

14±4

15±5

16±6

-

-

-

when

Up to 50

14±3

15±3

15±3

16±4

16±4

17±4

18±5

19±5

-

-

-

SV. 50 to 100

15±3

16±3

16±3

17±4

17±4

18±4

19±5

20±5

-

-

-

SV. 200 to 250

7±2

8±2

9±3

10±3

11±4

12±4

13±5

14±5

15±6

-

-

11±3

12±3

13±4

14±4

14±4

15±4

16±5

17±5

18±6

-

-

when

Up to 50

14±3

15±3

16±4

17±4

17±4

18±4

19±5

20±5

21±6

-

-

SV. 50 to 125

15±3

16±3

17±4

18±4

18±4

19±4

20±5

21±5

22±6

-

-

SV. 250 to 300

8±2

9±2

10±3

11±3

12±4

13±4

14±5

15±5

16±6

17±6

-

12±3

13±4

14±4

15±5

15±5

16±5

17±6

18±6

19±6

20±6

-

when

Up to 50

15±3

16±4

17±4

18±5

18±5

19±5

20±6

21±6

22±6

23±6

-

SV. 50 to 125

16±3

17±4

18±4

19±5

19±5

20±5

21±6

22±6

22±6

24±6

-

SV. 125 to 150

17±3

18±4

19±4

20±5

20±5

21±5

22±6

23±6

24±6

25±6

-

SV. 300 to 360

9±3

10±3

11±4

12±4

13±5

14±5

15±5

16±6

17±6

18±7

19±7

13±4

14±4

15±5

16±5

16±6

17±6

18±6

19±6

20±7

21±7

22±7

when

Up to 50

16±4

17±4

18±5

19±5

19±6

20±6

21±6

22±6

23±7

24±7

25±7

SV. 50 to 125

17±4

18±4

19±5

20±5

20±6

21±6

22±6

23±6

24±7

25±7

26±7

SV. 125 to 180

18±4

19±4

20±5

21±5

21±6

22±6

23±6

24±6

25±7

26±7

27±7

SV. 360 to 420

10±4

11±4

12±4

13±5

14±5

15±6

16±6

17±7

18±7

19±7

20±8

14±5

15±5

16±5

17±6

17±6

18±6

19±7

20±7

21±7

22±7

23±7

when

Up to 50

17±5

18±5

19±5

20±6

20±6

21±6

22±7

23±7

24±7

25±7

26±7

SV. 50 to 125

18±5

19±5

20±5

21±6

21±6

22±6

23±7

24±7

25±7

26±7

27±7

SV. 125 to 215

19±5

20±5

21±5

22±6

22±6

23±6

24±7

25±7

26±7

27±7

28±7

SV. 420 to 485

10±4

11±4

12±4

13±5

14±5

15±6

16±6

17±7

18±7

19±7

20±8

15±6

16±6

17±6

18±6

18±6

19±7

20±7

21±7

22±8

23±8

24±8

when

Up to 50

18±6

19±6

20±6

21±6

21±6

22±7

23±7

24±7

25±8

26±8

27±8

SV. 50 to 125

19±6

20±6

21±6

22±6

22±6

23±7

24±7

25±7

26±8

27±8

28±8

SV. 125 to 250

20±6

21±6

22±6

23±6

23±6

24±7

25±7

26±7

27±8

28±8

29±8

SV. 485 to 550

11±4

12±4

13±4

14±5

15±5

16±6

17±6

18±7

19±7

20±8

21±8

16±6

17±6

18±7

19±7

19±7

20±7

21±8

22±8

23±8

24±8

25±8

when

Up to 50

19±6

20±6

21±7

22±7

22±7

23±7

24±8

25±8

26±8

27±8

28±8

SV. 50 to 125

20±6

21±6

22±7

23±7

23±7

24±7

25±8

26±8

27±8

28±8

29±8

SV. 125 to 275

21±6

22±6

23±7

24±7

24±7

25±7

26±8

27±8

28±8

29±8

30±8

SV. 550 to 620

11±4

12±4

13±4

14±5

15±5

16±6

17±8

18±7

19±7

20±8

21±8

17±7

18±7

19±7

20±7

20±7

21±8

22±8

23±8

24±9

25±9

26±9

when

Up to 50

20±7

21±7

22±7

23±7

23±7

24±8

25±8

26±8

27±9

28±9

29±9

SV. 50 to 125

21±7

22±7

23±7

24±7

24±7

25±8

26±8

27±8

28±9

29±9

30±9

SV. 125 to 250

22±7

23±7

24±7

25±7

25±7

26±8

27±8

28±8

29±9

30±9

31±9

SV. 250 to 310

23±7

24±7

25±7

26±7

26±7

27±8

28±8

29±8

30±9

31±9

32±9

SV. 620 to 690

12±5

13±5

14±5

15±6

16±6

17±7

18±7

19±8

20±8

21±8

22±9

18±8

19±8

20±8

21±8

21±8

22±8

22±8

23±8

24±9

25±9

26±9

when

Up to 50

21±8

22±8

23±8

24±8

24±8

25±8

25±8

26±8

27±9

28±9

29±9

SV. 50 to 125

22±8

23±8

24±8

25±8

25±8

26±8

26±8

27±8

28±9

29±9

30±9

SV. 125 to 250

23±8

24±8

25±8

26±8

26±8

27±8

27±8

28±8

29±9

30±9

31±9

SV. 250 to 345

24±8

25±8

26±8

27±8

27±8

28±8

28±8

29±8

30±9

31±9

32±9

SV. 690 to 765

-

13±8

14±5

15±6

16±6

17±7

18±7

19±8

20±8

21±8

22±9

-

20±8

21±9

22±9

22±9

23±9

23±9

24±9

25±9

26±9

27±9

when

Up to 50

-

23±8

24±9

25±9

25±9

26±9

26±9

27±9

28±9

29±9

30±9

SV. 50 to 125

-

24±8

25±9

26±9

26±9

27±9

27±9

28±9

29±9

30±9

31±9

SV. 125 to 250

-

25±8

26±9

27±9

27±9

28±9

28±9

29±9

30±9

31±9

32±9

SV. 250 382

-

26±8

27±9

28±9

28±9

29±9

29±9

30±9

31±9

32±9

33±9

SV. 765 to 840

-

14±5

15±5

16±6

17±6

18±7

19±7

20±8

21±8

22±9

23±9

-

21±9

22±9

23±9

23±9

24±9

24±9

25±9

26±10

27±10

28±10

when

Up to 50

-

24±9

25±9

26±9

26±9

27±9

27±9

28±9

29±10

30±10

31±10

SV. 50 to 125

-

25±9

26±9

27±9

27±9

28±9

28±9

29±9

30±10

31±10

32±10

SV. 125 to 250

-

26±9

27±9

28±9

28±9

29±9

29±9

30±9

31±10

32±10

33±10

SV. 250 to 400

-

27±9

28±9

29±9

29±9

30±9

30±9

31±9

32±10

33±10

34±10

SV. 840 to 920

-

15±6

16±6

17±7

18±7

19±8

20±8

21±9

22±9

23±9

-

-

22±10

23±10

24±10

24±10

25±10

25±10

26±10

27±11

28±11

-

when

Up to 50

-

25±10

26±10

27±10

27±10

28±10

28±10

29±10

30±11

31±11

-

SV. 50 to 125

-

26±10

27±10

28±10

28±10

29±10

29±10

30±10

31±11

32±11

-

SV. 125 to 250

-

27±10

28±10

29±10

29±10

30±10

30±10

31±10

32±11

33±11

-

SV. 250 to 400

-

28±10

29±10

30±10

30±10

31±10

31±10

32±10

33±11

34±11

-

SV. 920 to 1000

-

-

17±7

18±8

19±8

20±8

21±9

22±10

23±10

24±10

-

-

-

24±11

25±11

25±11

26±11

26±11

27±11

28±11

29±11

-

when

Up to 50

-

-

27±11

28±11

28±11

29±11

29±11

30±11

31±11

32±11

-

SV. 50 to 125

-

-

28±11

29±11

29±11

30±11

30±11

31±11

32±11

33±11

-

SV. 125 to 250

-

-

29±11

30±11

30±11

31±11

31±11

32±11

33±11

34±11

-

SV. 250 to 400

-

-

30±11

31±11

31±11

32±11

32±11

33±11

34±11

35±11

-

SV. 1000 to 1085

-

-

18±8

19±9

20±9

21±9

22±10

23±10

24±10

-

-

-

-

25±11

26±11

26±11

27±11

27±11

28±11

29±12

-

-

when

Up to 50

-

-

28±11

29±11

29±11

30±11

30±11

31±11

32±12

-

-

SV. 50 to 125

-

-

29±11

30±11

30±11

31±11

32±11

32±11

33±12

-

-

SV. 125 to 250

-

-

30±11

31±11

31±11

32±11

32±11

33±11

34±12

-

-

SV. 250 to 400

-

-

31±11

32±11

32±11

33±11

33±11

34±11

35±12

-

-

SV. 1085 to 1200

-

-

-

20±9

21±9

22±10

23±10

24±11

25±11

-

-

-

-

-

27±12

27±12

28±12

28±12

29±12

30±12

-

-

when

Up to 50

-

-

-

30±12

30±12

31±12

31±12

32±12

33±12

-

-

SV. 50 to 125

-

-

-

31±12

31±12

32±12

32±12

33±12

34±12

-

-

SV. 125 to 250

-

-

-

32±12

32±12

33±12

33±12

34±12

35±12

-

-

SV. 250 to 400

-

-

-

33±12

33±12

34±12

34±12

35±12

36±12

-

-

Note. In the hole in addition to the allowances permitted conicity of 1:20.


An example of assignment of allowances and the marginal variance is given in Appendix (example 3).

19. Allowances and limit deviations for forgings such as cylinder with a hole should be assigned in accordance with the devil.10 and table.9.

Damn.10

Table 9

mm

Elevation details	The outer diameter of the part	Allowances (; ; ) and maximum deviations (;;)
at the height of	on the outer diameter	the inner diameter
Up to 80	To 8*	13±4	12±3	17±3
SV. 80 to 100	14±5	12±3	17±3
SV. 80 to 100	14±5	13±4	18±4
SV. 100 to 125	SV. 80 to 100	15±6	13±4	18±4
SV. 100 to 125	15±6	14±4	19±4
SV. 125 to 150	SV. 80 to 125	16±6	14±4	19±4
SV. 125 to 150	16±6	15±5	20±5
SV. 150 to 180	SV. 100 to 150	17±6	15±5	20±5
SV. 150 to 180	17±6	16±5	21±5
SV. 180 to 215	SV. 120 to 150	18±6	15±5	20±5
SV. 150 to 180	18±6	16±5	21±5
SV. 180 to 215	18±6	17±6	22±6
SV. 215 to 250	SV. 145 to 180	19±7	16±5	21±5
SV. 180 to 215	19±7	17±6	22±6
SV. 215 to 250	19±7	18±6	23±6
SV. 250 to 300	SV. 165 to 215	20±7	17±6	22±6
SV. 215 to 250	20±7	18±6	23±6
SV. 250 to 300	20±7	19±6	24±6
SV. 300 to 360	SV. 200 to 250	21±8	18±6	23±6
SV. 250 to 300	21±8	19±6	24±6
SV. 300 to 360	21±8	20±7	25±7
SV. 360 to 420	SV. 240 to 300	22±8	20±7	25±7
SV. 300 to 360	22±8	21±7	26±7
SV. 420 to 485	SV. 280 to 320	23±9	21±7	26±7
SV. 320 to 360	23±9	22±8	27±8
SV. 485 to 530	SV. 325 to 360	24±10	23±9	28±9

________________