Hardware testing of the hardness of stamping parts

Dongguan Hardware Testing Stamping Parts Hardness In order to obtain high surface hardness and wear resistance, many stamping parts molds and stamping parts mold accessories must undergo surface heat treatment, such as surface nitriding. In order to obtain high surface hardness and wear resistance, many stamping The parts molds and stamping parts mold parts must be subjected to surface heat treatment, such as surface nitriding. For such a mold, people are very concerned about its surface hardness and the depth of the hardened layer. When testing the hardness of stamping die steel that has undergone surface heat treatment, there is a wrong approach worthy of correction. This is the improper use of the Leeb hardness tester in this occasion. This is determined by the principle of the Leeb hardness tester. The three commonly used hardness testers of cloth, Luo, and Wei all use the static test principle, in which a hard indenter is slowly pressed into the surface of the sample, and then the depth or size of the indentation is tested to determine the hardness value. The Leeb hardness tester uses the principle of dynamic testing. It is to impact a sphere of specified quality on the surface of the sample at a specified speed, and test the difference between its initial speed and the rebound speed to determine the hardness value of the sample. To understand this, just look at how thick the standard hardness block of the Leeb hardness tester is. Obviously, the measured hardness value is neither the hardness of the nitride layer nor the hardness of the substrate, but the result of the combined effect of the two. Because the thickness of the surface layer of the stamping part is different, different results will inevitably be obtained. The main material of Dongguan metal stamping die is die steel (including tool steel and high-speed steel), and sometimes hard alloy stamping die is usually required to have high hardness and wear resistance, heat treatment is essential. Previous post: What are the measures to prevent the waste of metal stamping parts?