Precision gear grinding process
How to adjust the mounting angle of the precision gear (precision gear grinding) hob: When cutting the helical gear (including the helical gear), the spiral direction of the hob is reasonably selected, which has a certain influence on the accuracy of the hobbing gear.
When cutting the teeth, it is desirable that the mounting angle of the hob is smaller (the hob spiral is in the same direction as the cut gear spiral, and the mounting angle is small). Because of this, the hob is in the opposite direction to the machine tool table in the direction of the tangent of the cut gear. That is, the hobbing machine indexing worm has the opposite axial direction of the worm wheel, which can eliminate the gap of the worm wheel pair and is not easy to cause vibration, thereby improving the cutting accuracy.
Reduce the surface roughness, and at the same time make the hob participate in cutting more teeth, better cutting conditions, higher quality of the cut gear: such as the mounting angle of the hob, the number of teeth participating in the cutting is reduced, the cutting load is concentrated, the teeth are It is easy to wear and is prone to vibration, and the quality of the cut gear is poor.
Geared gears have the advantages of low transmission noise, high transmission efficiency and long service life. Grinding has been considered a costly tooling tool for aerospace or other high-tech applications. But now, the concept has changed: the efficiency of the gear grinding machine has improved, the performance of the grinding wheel is also better, and the high cost has been greatly reduced.
As a result, gear grinding has begun to be applied to gear processing on a large scale, such as the manufacture of automobile and motorcycle gears, and has reached a level of general application. In fact, all first-class automotive gear suppliers have a gear grinding machine in order to remain competitive. In the next two to five years, the automotive industry will gradually become a large growth market for hard tooth surface processing.
Because gear grinding removes heat distortion, many gearboxes use grinding gears to better control drive maneuvers and noise. The grinding process is basically mature and growing rapidly throughout the gear industry.
The materials used in gear grinding process are more common steel, while steel has quenched and tempered steel, hardened steel, carburized hardened steel and nitrided steel. .
Grinding teeth is an effective tooth-finishing method. It is generally used to machine hardened tooth surfaces. It has strong corrective ability for pre-grinding process errors and can achieve high precision. The tooth surface roughness can be as small as Rα0.63～0.16 microns. .
The development of the gear manufacturing process will be a further study of the mechanism of gear tooth damage, and it is the theoretical basis for improving gear bearing capacity and extending gear life;
Research on new gear production materials and new processing techniques; friction, lubrication theory and lubrication technology are the basic work in gear research, and study the theory of elastic fluid dynamic pressure lubrication.
Future gear production is developing in the direction of heavy load, high speed, high precision and high efficiency, and strives for small size, light weight, long life and economic reliability.