Gear is a common mechanical part in machining, which is widely used in mechanical equipment. Therefore, the surface quality of gear directly affects the operation of the whole mechanical equipment. Therefore, in order to improve the bearing capacity of gear and extend its service life, the method of surface strengthening treatment must be adopted to improve the hardness of gear.

Laser surface engineering technology is a high-tech which combines modern physics, computer, material science, advanced manufacturing technology and other achievements and knowledge. It can not only realize the surface strengthening of metal materials, but also realize the high-performance surface modification of low-grade materials, so as to achieve the best combination of low-cost parts and high-performance surface.

Laser quenching is to irradiate the surface of workpiece rapidly with high energy density laser beam, so that the absorbed light energy in the hardened part can be immediately converted into heat energy, and the temperature in the laser action area will rise sharply, forming austenite. At this time, there is a very high temperature gradient between the cold state of the matrix and the heating zone. Once the laser irradiation is stopped, the heating zone will undergo direct cold quenching due to quench, which will cause martensitic transformation on the metal surface. This kind of martensitic grain is very fine, with higher defect density than that of conventional quenching. Because of the extremely fast cooling speed, the carbon atoms are too late to diffuse, so the carbon content of martensite is higher High dislocation density is also obtained with austenite, so that the material has distortion strengthening effect and the strength is greatly improved.

Technological characteristics and advantages of laser surface treatment

1. Compared with the traditional process, it has the smallest deformation and small subsequent machining allowance. Some workpieces can be directly used after treatment.

2. It can handle specific parts of parts and other parts that are difficult to handle by other methods, and carry out flexible local strengthening.

3. Generally, there is no need for vacuum condition. Even when special alloying treatment is carried out, only blowing protective gas can effectively prevent oxidation and element burning.

4. High power laser equipped with multi-dimensional space motion table controlled by computer is especially suitable for mechanized and automatic production with high productivity.

5. High production efficiency, stable and reliable processing quality, low cost, green process, good economic and social benefits.

6. Laser strengthening makes the metal material more fatigue resistant (with high but stable residual pressure stress in the hardening layer).

Dalian hanpujiang New Precision Machinery Co., Ltd. is a comprehensive machining and international trade enterprise mainly engaged in the design and manufacture of various jigs, precision machinery parts, machine tool parts and mould parts. Welcome friends to consult.