Introduction to the hardness testing method of precision stamping materials 'hardware'

The main purpose of the hardness test of precision stamping parts is to determine whether the annealing degree of the purchased metal sheet is suitable for the subsequent stamping parts processing. Different types of precision stamping parts processing techniques require plates of different hardness levels. Hot-rolled steel plates are usually thick, and the Brinell hardness tester is generally specified in the steel standard to test the hardness. It is also feasible to use Rockwell hardness tester to detect hot-rolled steel plates, and HRB scale (the choice of Rockwell hardness tester scale) can be used. The portable Rockwell hardness tester is used to test hot-rolled steel plates, which can be tested without sampling, and the operation is very simple. All kinds of cold-rolled steel plates used for the processing of precision stamping parts mainly use Rockwell hardness tester to detect hardness, usually HRB scale, and HRC scale for harder ones. Thin plate material can use Webster hardness tester, surface Rockwell hardness tester HRN or HRT scale can also be used. The hardness of the brass plate used for the processing of precision stamping parts can be tested with the HRB scale of the Rockwell hardness tester. The softer brass plates and red copper plates use HRF scales. Thinner panels use HRT scales. The aluminum alloy plate used for the processing of precision stamping parts can be tested with a Webster hardness tester. When the material thickness is greater than 13mm, the Barcol hardness tester can be used. The pure aluminum plate or the low hardness aluminum alloy plate should use the Barcol hardness tester. The ultra-thin plates of various metals used for the processing of precision stamping parts can use the HR30T scale of the surface Rockwell hardness tester and cooperate with the diamond anvil to test the HR30Tm hardness value in this way. The thickness of the tested sheet can be less than 0.05mm. This test method is specified in Appendix A of the national standard GB/T230.1-2004. The HR15T and HR45T scales of the surface Rockwell hardness can also be used, and the hardness value is converted into HR30Tm after the test. Need to know more about precision stamping parts, welcome to consult: (same number on WeChat)