In order to obtain the high exterior hardness and wear resistance of the new energy shell, many stamping dies and stamping die components are subjected to exterior heat treatment, such as exterior nitriding. People are very concerned about the exterior hardness and the depth of the hardened layer on such dies.
When testing the hardness of stamping dies steel through exterior heat treatment, there is a fault that should be corrected. This is the improper use of the Leeb hardness tester on this occasion. This is due to the principle of the Leeb hardness tester. The three commonly used hardness tester is used static test principle, are a hard indenter is slowly pressed into the surface of the sample, and then test the indentation depth and scale, determine the size of the hardness value. The Richter hardness tester uses a dynamic testing principle.
The hardness of the sample is determined by the difference between the initial velocity and the rebound velocity of a sphere of regular mass impacting the surface of the sample at regular speed. To understand this, one need only look at how thick the standard hardness block of the Richter hardness tester is. Obviously it is measured out of the hardness value is neither the hardness of the nitriding layer, nor the hardness of the substrate, but the effect of the two together, because the thickness of the outer surface of the stamping parts, will inevitably come up with different effects.
Stamping die primary material is die steel (including tool steel and high-speed steel), sometimes also used carbide stamping die general requirements with high hardness and wear resistance, heat treatment is essential.
Power shell stamping parts electromagnetic forming skills is a kind of non-touch forming process, its outstanding strengths one is manufacturing forming agile high ergonomics, two is commonly used in metal and non-metallic articulation, can replace the bonding and welding; Third, do not consume pro-assisted materials such as grease, favorable environmental protection.
