Hardness testing tool during heat treatment

In order to improve the performance of the workpiece, we can use the heat treatment process to improve the hardness and wear resistance of the workpiece, but in order to better handle the performance of the workpiece, we must always test the hardness of the workpiece during the heat treatment process. In order not to meet the requirements for use, the common hardness testing tools in the heat treatment process mainly include the following three types.

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1. Vickers Hardness Tester: It is an important means to test the surface hardness of heat-treated workpieces. It can use a test force of 0.5~100kg to test the surface hardening layer as thin as 0.05mm. Its accuracy is very high, and it can distinguish the heat treatment Small differences in the hardness of the surface of the workpiece. In addition, the depth of the effective hardened layer should also be detected by a Vickers hardness tester. Therefore, it is necessary to equip a Vickers hardness tester for units that perform surface heat treatment or use a large number of surface heat treatment workpieces.

2. Surface Rockwell hardness tester: It is also very suitable for testing the hardness of surface quenched workpieces. There are three scales to choose from for surface Rockwell hardness testers, which can test various surface hardened workpieces whose effective hardening depth exceeds 0.1mm. Although the surface Rockwell hardness The accuracy of the Vickers hardness tester is not as high as that of the Vickers hardness tester, but as a detection method for quality management and qualification inspection in heat treatment plants, it can already meet the requirements. Moreover, it has the advantages of simple operation, convenient use, low price, rapid measurement, and direct reading of hardness. The surface Rockwell hardness tester can be used to quickly and non-destructively detect batches of surface heat-treated workpieces one by one, which is of great significance for metal processing and machinery manufacturing factories.

3. Rockwell hardness tester: When the surface heat treatment hardened layer is thick, the Rockwell hardness tester can also be used. When the heat treatment hardened layer thickness is 0.4~0.8mm, the HRA scale can be used. When the hardened layer thickness exceeds 0.8mm, HRC scale can be used.