GB/T 5125-2008Method for deep drawing cups testing of non-ferrous metals (English PDF)

1 Scope

This standard specifies the deep drawing cups testing method for nonferrous metals.

This standard applies to the deep drawing cups testing method for nonferrous metal sheets and strips, which have a thickness of 0.10 mm ~ 3.00 mm for deep drawing at a temperature of 10 °C ~ 35 °C.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.

GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values

GB/T 16825 (all parts) Verification of static uniaxial testing machines

JJG 583 Verification regulation of cupping testing machine

3 Terms and definitions

The following terms and definitions apply to this standard.

7 Test equipment and tools

8 Test steps

8.1 According to the thickness of the disc specimen, select the appropriate punch and die according to Table 2. The punch diameter deviation is, the die diameter deviation is, the punch or die's fillet radius deviation is ±0.05 mm.

8.2 Install the punch and die; eccentricity is not allowed.

8.3 Apply a small amount of lubricant, such as engine oil, industrial vaseline, etc., to the upper and lower surfaces of the disc specimen.

8.4 Place the disc specimen in the die.

8.5 Adjust the clamping device and apply appropriate pressure to the disc specimen, so that there will be no unstable wrinkles when the disc is stretched, meanwhile it is easy to stamp and form without breaking.

8.6 Move the punch or die at a controllable uniform speed, until the cup is punched out and the cup is not broken.

8.7 Measure the earing peak and earing valley of the cup. The measurement accuracy shall be not less than 0.05 mm. […]