1. Hobbing process:
Hard tooth surface hobbing process, the use of cemented carbide hob can improve the processing efficiency, the requirements of the hobbing machine rigidity, high precision, only in the correct cooperation of tooth cutting technology, tools and machine tools, etc., so that the tooth cutting process can reach the best state, the accuracy of hard tooth surface hobbing can reach 7 grades.
The biggest problem of hard tooth surface hobbing is that the gear tooth shape accuracy is low and the machining accuracy is unstable.
2. Gear grinding processing technology:
(1) Forming grinding gear:
Forming and grinding gears are generally suitable for the mass production of gears with 5-6 precision, and are also particularly suitable for the processing of gears with large modulus, fewer teeth, large width and various modification gears.
The accuracy achieved by forming grinding is comparable to that of developed grinding, and the productivity is many times higher, and the efficiency will be further improved when applied to forming grinding with strong and efficient grinding.
(2) Gear grinding:
The developed grinding method can be divided into single tooth indexing and continuous grinding method. The single-tooth indexing and tooth grinding method can be subdivided into disc grinding wheel grinding teeth, conical grinding wheel grinding teeth and large plane grinding wheel grinding teeth; The continuous development of the grinding method can subdivide the grinding teeth of the worm grinding wheel.
a. The Swiss MAAG gear grinding machine adopts a disc-shaped grinding wheel to grind the teeth, in addition to continuing to maintain the advantages of high precision, the structure and grinding methods have been improved, and the efficiency has been improved, but it often takes several hours to grind a gear, and the cost is very high, especially the efficiency of the large-scale gear grinding machine is lower.
b. The cone grinding wheel gear grinding machine has good versatility and is widely used in production. However, due to the long transmission chain of the cone grinding wheel gear grinding machine, and the involute tooth surface is enveloped point by point, which affects the machining accuracy and stability, the working hours of a single piece are generally 0.6-3h.
c. The transmission chain of the large-plane grinding wheel gear grinding machine is short, the structure is relatively simple, and the machining accuracy is also high; However, the processing efficiency is very low, and it is mostly used to process gear cutters such as shaving cutters and shaper cutters, as well as gears with high precision.
d. The worm grinding wheel gear grinding machine has the highest efficiency, generally more than 10 minutes to grind 1 gear, suitable for 5-6 levels of precision, the number of teeth >8mm or the diameter of >600mm.
(3) Gear shaping processing technology:
On the basis of the ordinary gear shaping process, some domestic factories have also done some research on the hard tooth surface shaping process. At present, it can insert a 7-level precision gear with a medium and hard tooth surface of about 48HRC. However, it is very difficult to insert a grade 6 precision gear with a hard carbide shaper cutter.
4. Shaving processing technology:
In recent years, China has also been studying the hard tooth surface shaving process, and it has been able to shave the 7-level precision gear with a medium and hard tooth surface of about 48HRC, and the processing efficiency is very high.
5. Milling gear processing technology:
Honing is the main method for high-precision hard tooth surface gear processing; However, it is more difficult to improve the honing accuracy to level 6.
The contact fatigue strength of the tooth surface, the bending fatigue strength of the tooth root and the anti-gluing ability of the tooth surface of the hard-faced gear have been improved, and they are generally used for high-torque and high-power power transmission.