The difference between gear hobbing and hobbing

Writer： admin Time：2024-03-22 14:51:51 Browse：34℃

The machining process of a gear is composed of several processes. In order to obtain a gear that meets the accuracy requirements, the entire machining process is centered around the tooth profile machining process. There are many methods for tooth profile machining, and according to whether there is cutting in the machining, it can be divided into two categories: non cutting machining and cutting machining.

Non cutting machining includes new processes such as hot-rolled gears, cold-rolled gears, precision forging, and powder metallurgy. Non cutting machining has a series of advantages such as high production efficiency, low material consumption, and low cost, and has been widely promoted and used. But due to its low processing accuracy, the process is not stable enough, especially in the production batch

It is difficult to adopt when it is young, and these drawbacks limit its use.

The cutting process of tooth profile has good machining accuracy and is still the main machining method for tooth profile. According to its machining principle, it can be divided into two types: forming method and generating method.

The characteristic of the forming method is that the cutting edge shape of the tool used is the same as the shape of the groove of the gear being cut. The methods for machining tooth profiles using the principle of forming include milling teeth on a milling machine with a gear milling cutter, grinding teeth with a forming grinding wheel, and pulling teeth with a gear puller. These methods have lower machining accuracy due to indexing errors and tool installation errors. Generally, gears with precision levels of 9-10 can only be machined. In addition, multiple discontinuous tooth divisions are required during the machining process, resulting in low productivity. Therefore, it is mainly used for single piece small batch production and repair work, as well as for gears with low machining accuracy.

The generation method is based on the principle of gear meshing for machining. The tooth profile produced by this method is the envelope of the cutting edge motion trajectory of the tool. Gears with different numbers of teeth can be machined using the same tool as long as the module and tooth angle are the same. The methods for machining tooth profiles using the principle of generation include gear hobbing, gear shaping, gear shaving, gear honing, and gear grinding. Shaving and honing, as well as grinding, belong to the precision machining methods of tooth profile. The generation method has high machining accuracy and production efficiency, and good tool versatility, so it is widely used in production.