How to measure the hardness of punching parts

Precision punch press parts hardness how to detect, stamping parts, including punching, bending, drawing, forming, finishing and other processes. Stamping materials are mainly hot rolled or cold rolled (cold rolled mainly) of the metal strip materials, such as carbon steel, alloy steel, spring steel, galvanized sheet, tin plate, stainless steel plate, copper and copper alloy Plate, aluminum and aluminum alloy plate. Hardness testing of metal materials in the stamping process has a very important significance. Stamping industry hardness testing can be divided into the following three parts: 1, the mold hardness testing. 2, stamping parts intermediate products and stamping parts of the hardness testing.

3, raw materials into the plant testing. Are introduced as follows: Stamping material hardness testing Stamping material hardness testing, precision punch its main purpose is to determine the extent of the purchase of the metal sheet annealing is suitable for subsequent processing of the stamping parts, different types of stamping parts processing technology, the need for different hardness levels Of the plate. Hot-rolled steel sheet is usually thick, steel standard is generally specified with a Brinell hardness tester to detect hardness. Rockwell hardness testing of hot-rolled steel plate is also feasible Angle Iron Punching Machine, can be used HRB scale (Rockwell hardness scale selection). Portable Rockwell hardness tester for testing hot-rolled steel, can not be sampled under the conditions of the test steel structural drilling machine, the operation is very simple. A variety of cold-rolled steel for the processing of stamping parts Rockwell hardness tester to measure the hardness, usually with HRB scale, with a harder HRC scale. Sheet material can be used Webster hardness, can also be used surface Rockwell hardness HRN or HRT scale. The hardness of the brass plate used to process the stampings can be measured with the HRB scale of the Rockwell hardness tester. Soft brass and copper plate with HRF scale.

The thinner plate uses the HRT scale. For the stamping parts of the aluminum alloy plate can be used Webster hardness testing, material thickness greater than 13mm can be used when the hardness of Pakistan, pure aluminum or low-hardness aluminum alloy plate should be used in the hardness of Pakistan Drilling Machine for steel structure. Extremely thin plates of various metals used in stamping can be tested in HR30Tm hardness in this way using the HR30T scale of the surface Rockwell hardness tester and with the diamond anvil. The thickness of the test sheet may be less than 0.05 mm. This test method is specified in Annex A of the national standard GB / T230.1-2004. Can also use the surface hardness of HR15T and HR45T Rockwell scale, after testing converted into HR30Tm hardness value.

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