On Spiral Bevel Gear CNC Manufacturing Key Technology

Bevel gears are used for transmitting the rotational motion of the crossing or interleaving axes with the constant transmission ratio. They include spiral bevel gears and hypoid gears. Due to its performance, such as the big overlap coefficient, the high carrying capacity, the smooth transmission, spiral bevel gears are widely used in many industry fields, such as aviation, automobile and machine tool. So bevel gears have become essential transmission components in modern machinery industry. Nowadays its production is mainly finished by the special machine tool. But because of the complexity of machining principle, there are a lot of problems remained for a long time. For example, the manufacture is complex, time-spending and costly. What's more, restriction of the machine structure and size, make it impossible to machine some big dimension gear pairs. Therefore, it is significant to solve these problems on processing of the spiral bevel gears.Based on Digital Manufacturing theory, it is significant to finish gears with high efficiency, high precision and high flexibility, which use computer technology and CNC technology to solve the problems above. The thesis brought forward a new Gleason spiral bevel gears modeling method fit for NC machining on CNC machine center, based on the CAD / CAM integration technology and multi-axis CNC technology. The method will be able to complete all kinds of gear system and various module spiral bevel gear machining in an ordinary milling machine center, which is from the special machine tool constraint. Furthermore, by using this method, some cumbersome calculate was eliminated in the actual machining, the requirement of the staff was lowered in the operation, the product development cycle was shortened, and the cost was reduced.The main contents of this paper are as follows:1. The basic concept and related theory of bevel gears were briefly introduced, and the movements of the traditional machining method of spiral bevel gears were analyzed. 2. According to requirements of the tooth surface machining, machine center structure and CNC system were selected.3. Make out the processing of spiral bevel gears, and calculate the cutter location under the UG software. Then according to machine center structure and directive format of CNC system, building post processing, and getting the G-code.4. The machining part of the spiral bevel gears was redeveloped in UG NX.5. Test machining of the spiral bevel gears, and perfect the processing of spiral bevel gears based on the ordinary multi-axis tools.