As a prominent performance of modern industrial production is accuracy, the accuracy of automobile gear hobs is regarded as the most basic classification requirement. Here, various types of gear hobbing cutters are divided into finish machining, semi finish machining and rough machining according to the functional characteristics required by customers.
Standard automobile gear hob is an involute gear hob designed and generated according to the recommendations of the Research Institute of metal cutting tools with a given diameter and length. Due to the different process basis and development conditions in various countries, each country has designed its own hob standards, and large hob manufacturing and use enterprises have also partially established standards suitable for their own requirements.
Taking accuracy as the basic dimension of hob classification, it can be divided into finish machining, semi finish machining and rough machining. Automobile gear precision hob is a kind of tool that is directly processed and formed on gear hobbing machine. This hob is mainly used for parts with special structure, and it is impossible to use the subsequent finishing process to meet the processing conditions. Different from the fine hob, the semi fine hob is more used in automobile gears. This type of parts usually require shaving or grinding after gear hobbing to ensure the quality of products. This can reduce the difficulty of tool manufacturing and part processing, and then reduce the cost.
The design requirements and forms of convex corner and undercutting that should be paid attention to in the design process of automobile gear cutter are also discussed. More importantly, multi head hobs are also discussed, which will be a key research project to improve product processing efficiency in the future.