Bearing processing technology: detection method of surface treatment of the work
1, chemical treatment
Chemical treatment is to penetrate the surface atoms of one or several chemical elements, thereby changing the chemical composition of the surface, organization and performance. After quenching and tempering, the surface with high hardness, wear resistance and contact fatigue strength, and the core portion of the work but also has high strength and toughness.
The main technical parameters of the chemical treatment of the workpiece is hardened layer depth and surface hardness. Hardened layer depth or to use the Vickers hardness tester to detect. Detected from the surface down to the hardness 50HRC that point distance. This is an effective case depth hardness testing chemical treatment of the workpiece surface hardness detection and treatment of the workpiece surface hardening similar, you can use the Vickers hardness, surface Rockwell hardness or Rockwell hardness to detect, but is thicker than the nitriding thin, generally not more than 0.7mm, then you can not use a Rockwell hardness.
2, surface hardening heat treatment
Surface hardening heat treatment usually induction heating or flame heating manner. The main technical parameters of surface hardness, local hardness and effective hardened layer depth. Hardness testing Vickers hardness tester can also be used or Rockwell Superficial Rockwell hardness. Test Force (ruler) selection and effective case depth and hardness of the surface. This involves three kinds of hardness.
Vickers hardness test heat treatment is an important means of surface hardness, it can choose the test force 0.5 ~ 100kg, testing thin 0.05mm thick hardened surface layer, which is the highest precision, can distinguish the treatment of the workpiece surface hardness minor differences. In addition, the effective hardened layer depth gauge should be detected by the Vickers hardness, so that the heat treatment process for surface treatment of the workpiece or the extensive use of surface units, with a Vickers hardness tester is necessary.
Rockwell hardness of the surface is also very suitable for testing the hardness of the workpiece surface hardening, surface Rockwell hardness scale, there are three to choose from. You can test the effective hardening depth of more than 0.1mm of various surface hardening of the workpiece. Although the surface Rockwell hardness Vickers hardness tester accuracy is not high, but as the heat treatment factory quality management and testing methods qualified inspection, has been able to meet the requirements. Moreover, it also has a simple, easy to use, low price, rapid measurement, hardness value can be read directly, etc., using surface Rockwell hardness tester can perform batch treatment of the workpiece surface is detected by piece fast lossless. This has important implications for metal processing and machinery manufacturing plants.
