Application of Laser Surface Treatment Technology in Gear Machining
Gears are universal mechanical parts that are widely used and used in the transmission system of mechanical equipment. They are prone to failures such as fatigue, pitting, gluing, and broken teeth during use. Therefore, the quality of the gear surface directly affects the transmission. The quality and longevity of the components. In order to improve the bearing capacity of the gear and prolong its service life, surface strengthening treatment must be used to increase the hardness of the gear. A variety of heat treatment methods are used in industry to strengthen the surface. Among them, gear laser surface strengthening is a new type of surface strengthening technology. Through years of development and successful practice, it has overcome some of the shortcomings of traditional heat treatment and has become practical and extremely developed. A high-tech in the future.
Laser surface engineering technology is a high and new technology that combines the achievements and knowledge of modern physics, computer, material science, advanced manufacturing technology, etc. It can not only realize the surface strengthening of metal materials, but also It can realize high-performance surface modification of low-grade materials, and achieve the best combination of low-cost parts and high-performance surface.
Laser quenching is to quickly irradiate the surface of the workpiece with a high-energy density laser beam, so that the hardened part instantly absorbs light energy and immediately converts it into heat energy, so that the temperature of the laser will rise sharply to form austenite. At this time, the matrix is u200bu200bcold and has a very high temperature gradient with the heating zone. Once the laser irradiation is stopped, the heating zone undergoes direct cooling and quenching due to the rapid cooling, which causes the martensite phase transformation on the metal surface, and this martensite The grains are very refined and have a higher defect density than conventional quenching. Because the cooling rate is extremely fast and carbon atoms are too late to diffuse, the martensite has a higher carbon content, and the participating austenite also obtains a high dislocation density, so that The material has a distortion strengthening effect and its strength is greatly improved.
Process features and advantages
1. Compared with the traditional process, it has the smallest deformation, and the subsequent machining allowance is small. Some workpieces can be used directly after processing.
2. It can handle specific parts of parts and parts that are difficult to handle by other methods, and perform flexible local strengthening.
3. Generally, there is no need for vacuum conditions. Even during special alloying treatment, only blowing protective gas can effectively prevent oxidation and element burning.
4. The high-power laser equipped with a computer-controlled multi-dimensional motion table is especially suitable for mechanized and automated production with high productivity.
5. High production efficiency, stable and reliable processing quality, low cost, green technology, good economic and social benefits.
6. Laser strengthening is that metal materials are more resistant to fatigue (the hardened layer has a higher but stable residual compressive stress).