GB/T 15825.2-2008Sheet metal formability and test methods - Part 2: General test rules (English PDF)

2.1

Sheet metal formability test is usually carried out at 10 °C ~ 35 °C temperature environment. If strict requirements, temperature-controlled laboratory

System for the 23 °C ± 5 °C.

Formability of sheet metal testing process 2.2 containing the following general steps.

a) sample preparation;

b) Test preparation mold;

c) test device with the test machine is ready;

d) Sample lubrication;

e) pre-test operation;

f) formal test;

g) data collection and calculation;

h) Fill in the test report.

3.1 Sampling

Select the portion of the sample should be avoided 3.1.1 sheet metal material head and edges.

3.1.2

Select the angle of the sample (sample angle) to the rolling direction as a reference, the allowable angle tolerance of ± 1 °.

3.2 Sample Preparation

3.2.1

Sample geometry and dimensions (including tolerances) is determined by the specific test standards.

3.2.2

Sample Available Chong, preparation or cutting scissors, wire cutting and other methods. For perforated sample usually requires burr hole edge or be

Reaming, Whetstone sandpaper or sanding or grinding.

3.2.3

The prepared sample should be smooth, no scratches the surface, edge burr hole edge should be smooth, without edges and burrs. For demanding test

Like edge or hole edge, applied 5 times magnifying glass to check there is no micro-cracks or other defects.

3.2.4

prepared samples should not be cold, hot leveling or repair any knock, and prepared to deal with samples indicate their status.

3.2.5

If the sample thickness measurement, there are strict requirements should be completed after the sample preparation work in the most representative sample of three parts

Measuring the thickness, and their average as measured specimen thickness measurement is accurate to 0.01mm.

3.2.6

The prepared sample shall specific test requirements grouping number.

3.2.7

If the sample being not prepared, it should be coated with anti-rust oil and properly stored.

4.1 mold design and manufacturing

4.1.1

for mold work parts, such as punch, die and blank holder, etc., in addition to working part shapes and sizes must be specifically labeled […]