GOST R ISO 20482-2015

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  ГОСТ Р ИСО 20482-2015

GOST R ISO 20482−2015 Materials metal. Sheets and strips. Test hood Eriksen

GOST R ISO 20482−2015
Group B09

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

THE METAL MATERIALS. SHEETS AND STRIPS

Test hood Eriksen

Metallic materials. Sheets and strips. Erichsen cupping test

OKS 77.040.10

Date of introduction 2016−01−01

Preface

1 PREPARED AND SUBMITTED by the Technical Committee for standardization TC 145 «monitoring Methods of steel products» based on authentic translation into the Russian language of the international standard referred to in paragraph 3

2 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology of April 21, 2015 N 278-St

3 this standard is identical with ISO 20482:2013* «the metal Materials. Sheets and strips. Test hood Eriksen» (ISO 20482:2013 «Metallic materials — Sheet and strip — Erichsen cupping test»)
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* Access to international and foreign documents referred to here and hereinafter, can be obtained by clicking on the link to the site shop.cntd.ru. — Note the manufacturer’s database.

4 in applying this standard it is recommended to use instead of the referenced international standards corresponding national standards of the Russian Federation and interstate standards, details of which are given in Appendix YES

5 INTRODUCED FOR THE FIRST TIME

Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) reference index «National standards» and the official text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the upcoming issue of the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet (www.gost.ru)

1 Scope

This standard specifies the test method for the extrusion of sheets and strips for Eriksen to determine the ability of metallic sheets and strips of a thickness from 0.1 mm to 2 mm and a width of not less than 90 mm to be subjected to plastic deformation in the molding material.

For testing of materials with the thickness of the sheets and strips more or less than listed above, you must use the dimensions of the test instrument in accordance with table 1.

2 Normative references

This standard uses the regulatory references to the following standard*:
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* The table of conformity of national standards international see the link. — Note the manufacturer’s database.

ISO 4287 Geometrical product specifications (GPS) — surface texture: Profile method — Terms, definitions and parameters of surface texture (ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters)

3 Terms and definitions

In this standard, apply the following term and its definition.

3.1 through crack: Crack that runs through the whole thickness of the specimen and is visible to the light.

4 Symbols and designations

The symbols and designations used in this standard is given in figure 1 and in table 1.

Figure 1 — Schematic representation of the test hood Eriksen

Figure 1 — Schematic representation of the test hood Eriksen

Table 1 — Symbols and designations

Dimensions are in millimeters

5 the essence of the method

5.1 the essence of the method lies in the indentation of the spherical punch into the sample, clamped under the action of efforts between the clamping ring and the matrix, before the squeezing hole through cracks. The result of the test is the measured depth of the hole.

6 Instrumentation

6.1 the Test shall be performed on the device, equipped with a matrix with a punch and clamping ring, dimensions, and limit deviations of the dimensions of which are given in table 1.

6.2 the design of the device needs to be monitored outside of the sample during the test to determine the time of occurrence of through cracks.

Note — the Beginning of the rupture is accompanied by reduced effort of squeezing through the appearance of cracks in the sample, and sometimes the appearance of noticeable noise.

6.3 To measure the movement of the punch device must be equipped with a pressure gauge with scale division 0.1 mm.

6.4 Matrix, the compression ring and the plunger must be sufficiently rigid to not deform during testing. The Vickers hardness of the working surfaces of the matrix, clamping ring and a punch must be not less than 750 HV 30.

6.4.1 the Punch during the test should not rotate.

6.4.2 the working surface of the punch must be spherical and highly polished. The average value of roughness Raas defined in ISO 4287 should be 0.4 mm.

6.5 Misalignment of the axis of the punch relative to the axis of the matrix on the length of the stroke should not exceed 0.1 mm.

6.6 the surface of the clamping ring and the matrix in contact with the sample must be flat and perpendicular to the axis of movement of the punch. The matrix should be self-centering relative to the fixed clamp ring.

6.7 the Device should provide a clamp of the sample with a constant force of about 1 kN.

6.8 Measurement of movement of the punch comes from the initial point of contact with the surface of the sample.

6.9 Instead of the punch indicated on figure 1, table 1, 6.1, 6.4 and 6.5 can be used balls made of hardened steel.

7 Sample for test

7.1 the Sample for test shall be flat and of such size that when the value of the width of 90 mm, the distance from the center of any hole to any edge of the specimen was not less than 45 mm and not less than 90 mm to the center of an adjacent hole. For narrow samples, the centers of the holes should be located in the centre of the specimen at a distance of ½ of its width and, at least at a distance of one width from the center of an adjacent hole.

7.2 At the edges of the samples shall be free of burrs or bent edges that prevent the correct installation of the sample in the device that could adversely affect testing.

7.3 Before the test, not allowed heat-treated samples, edit them in hot or cold condition, and any surface treatment.

8 test Conditions

The test shall be performed at a temperature from 10 °C to 35 °C. If the temperature was in the range of (23±5)°C, the test carried out under controlled conditioning.

9 testing

9.1 the determination of the thickness of the sample perform with the precision of 0.01 mm.

9.2 Before the test, the specimen surface that will be in contact with the punch and the die, smeared with a thin layer of graphite lubricant. Recommended lubricant composition is given in Appendix A.

9.3 the Sample is clamped between the clamping ring and the matrix. The contact pressure of the specimen must be approximately equal to 10 kN.

9.4 the Contact of the punch with the sample should occur without impact. The measurement of the depth of penetration of the punch comes from the ground.

Note — Before testing the upper part of the punch needs to be on the same level as the upper surface of the clamping ring (reference point calibration).

9.5 the process of pushing the hole should be smooth. The rate of penetration for the standard sample should be from 5 mm/min to 20 mm/min For samples with a size of 90 mm, the velocity of indentation should be from 5 mm/min to 10 mm/min.

Notes

In manual operation device in the end of the operation the rate was lowered to a value close to the lower limit, in order to accurately determine the time of occurrence of through cracks.

Under computer control of the device, reduce the speed at the end of the test is not required because the test result is indicated directly on the graph of the movement of the punch from the stress (force/punch).

9.6 stopping the movement of the punch occurs at the time of emergence through cracks through the whole thickness of the sample.

9.7 Measurement of depth of hole (h, figure 1) obtained in the test is determined with a precision of 0.1 mm.

9.8 you Must perform at least three tests unless otherwise stated in the normative documentation for the products. The value of the index indentation on Eriksen , expressed in millimeters, obtained as the average value calculated from at least three individual readings.

10 test report

The test report shall include the following information:

a) reference to this standard;

b) the full identification information of the test specimen (orientation of the sample);

c) the thickness of the sample;

d) type of lubrication;

e) appearance of the specimen after the destruction (if required);

f) the value of the index Eriksen , individual values, on demand.

Annex a (informative). Recommended composition of graphite lubricant

Appendix A
(reference)

It is known that the test results depend on the type of used lubricant. One of the typical lubricants suitable for testing, has the characteristics as defined by the technical requirements of the material. Grease consists of a calcium soap, refined mineral oil and flake graphite. It should be free from substances that cause corrosion, of pieces of resin, wax and fillers.

Lubricant and its components shall meet the requirements given in table A. 1.


Table A. 1 — Recommended specifications for graphite lubricant

App YES (reference). Information about the compliance of the referenced international standards national standards of the Russian Federation (and acting in this capacity inter-state standards)

App YES
(reference)

Table YES.1

The electronic text of the document
prepared by JSC «Code» and checked by:
the official publication of the
M.: STANDARTINFORM, 2015