Comparison of Several Processing Techniques of Hardened Gears

The comparison descriptions of several processing techniques of hardened gears are as follows, for reference and understanding. For unclear parts or related requirements, you can consult EP free of charge.

XNUMX. Hobbing process:

Hard tooth surface hobbing technology, the use of carbide hobs can improve the processing efficiency, and the hobbing machine requires good rigidity and high precision. Only with the correct cooperation of gear cutting technology, tools and machine tools, the gear cutting process can be optimized State, the precision of hard tooth surface hobbing can reach level 7.

The biggest problem with hard tooth surface hobbing is that the gear tooth profile accuracy is low and the machining accuracy is unstable.

XNUMX. Gear grinding process:

1. Forming and grinding teeth:

Forming gear grinding is generally suitable for mass production of gears with 5-6 precision, and it is especially suitable for the processing of gears with large modulus, fewer teeth, and large width and various modified gears.

The precision achieved by forming grinding teeth is comparable to that of forming grinding teeth, and the productivity is many times higher. Powerful and efficient grinding is applied to forming grinding teeth, and the efficiency will be further improved.

2. Development into gear grinding:

The generative gear grinding method can be divided into single-tooth indexing generative gear grinding method and continuous generative gear grinding method; and single-tooth indexing generative gear grinding method can be subdivided into disc grinding wheel gear grinding and conical grinding wheel Gear grinding and large-plane grinding wheel grinding; continuous generative gear grinding method can be subdivided into worm grinding wheel grinding teeth.

a. The Swiss maag gear grinding machine uses a disc-shaped grinding wheel to grind the teeth. In addition to maintaining the advantages of high precision, the structure and grinding methods have been improved, and the efficiency has been improved. However, it often takes several hours to grind a gear. The cost is very high, especially the efficiency of large-size gear grinding machines is lower.

b. The conical grinding wheel gear grinding machine has good versatility and is widely used in production.However, due to the length of the transmission chain of the conical grinding wheel gear grinding machine, and the involute tooth surface is enveloped point by point, it affects the processing accuracy and stability, and the single working time is generally 0.6-3h.

c. The large plane grinding wheel gear grinding machine has a short drive chain, a relatively simple structure and high machining accuracy; but the machining efficiency is very low, and it is mostly used to process gear tools such as gear shaving cutters and gear shapers, as well as gears with higher precision.

d、蜗杆砂轮磨齿机的效率最高，一般10多分钟就能磨1个齿轮，适于5-6级精度，齿数>8mm或直径>600mm的加工。

XNUMX. Gear shaping process:

Some domestic factories have also done some research on the hard tooth surface gear shaping technology based on the ordinary gear shaping technology.At present, it is possible to insert medium-hard gears with 48-level precision gears of about 7hrc.However, it is very difficult to insert 6-level precision gears with hard-tooth alloy gear shaper cutters.

XNUMX. Gear shaving processing technology:

In recent years, China has also been studying hard-tooth surface shaving technology. At present, it has been able to shave medium-hard tooth surface 48-level precision gears of about 7hrc, and the processing efficiency is very high.

XNUMX. Tooth milling process:

Honing gear is currently a high-precision hard tooth surfaceGear processingHowever, it is more difficult to improve the gear honing accuracy to level 6.

Hardened gears have improved tooth surface contact fatigue strength, tooth root bending fatigue strength and tooth surface anti-gluing ability, and are generally used for high-torque and high-power power transmission.the aboveHardened gearThe comparison description of several processing techniques is for reference only. For more information, please ask the EP technicians for help.