In terms of fully CNC gear milling technology, Oricon and Klingenberg developed S-Series and AMK series mechanical cycloidal bevel gear milling machines based on their respective design and processing theories. Both types of machine tools adopt rocking table structure and complex mechanical transmission chain to realize the generative movement between the gear and the workpiece in the processing process. With the development of numerical control technology, coordinate full numerical control machining with higher machining flexibility and higher machining accuracy has become the development direction in the future. Deng studied the method of machining spiral bevel gear with disk and end milling cutter on general five axis machining center.
Based on the flexibility of CNC gear milling machine, Zhou and Tang studied a design and calculation method of tooth profile surface. This method can control the contact characteristics of multiple meshing points and ensure the second-order tangency of two tooth surfaces at the contact point. A. Artoni studied the grinding of spiral bevel gears with face hobbing on a six axis CNC gear grinding machine. Simon uses the high-order motion characteristics of the full CNC machine tool to control the contact pressure and transmission error of the developed gear pair. On this basis, Shih and Fong studied the method of directly correcting the tooth profile error on the full CNC machine tool by using high-order motion characteristics. In terms of motion control of full CNC gear milling machine, Shih and Fong deduced the relative position and attitude of cutter head and workpiece in the two types of machine tools based on the motion characteristics of mechanical and full CNC spiral bevel gear milling machine, On the basis of ensuring the same, the axis coordinates of the relative position and attitude between the control cutter head and the workpiece of the full NC gear milling machine are solved as variables, and the control model of the full NC machine tool is obtained.
They also studied the method of machining straight bevel gears by end face hobbing on the full NC gear milling machine, and used FANUC 16i CNC system to realize the motion control of the machine tool by polynomial interpolation and electronic gear function. M. Gabicin represents the relative position and attitude of the two types of machine tools and gears with a series robot model. On the basis of ensuring that the relative position and attitude of the two types of machine tools and gears are the same, the motion trajectories of each axis of the full NC machine tool are represented by polynomials using the central difference method (CDM) and the least square method (LSM).
The above method needs to solve the multivariate nonlinear equations to obtain the coordinates of each axis of the full CNC machine tool. On the other hand, due to the form of polynomial interpolation, the polynomial coefficients of each axis interpolation need to be calculated in advance, and the polynomial is used to approximate the motion trajectory of each coordinate axis, resulting in the complexity of the whole calculation process and inconvenient to realize online real-time programming on the CNC system, And the overall polynomial approximation will also have large theoretical errors. Tianjin First Machine Tool General Factory has developed a complete set of equipment for end face milling of arc bevel gears, forming a complete product system from mechanical to semi NC, and then to full NC. Hunan Zhongda Chuangyuan, Hunan halang kaishuai, Tianjin Jingcheng and other companies have also developed fully CNC arc bevel gear milling machines and grinding machines. However, due to the lack of mature and systematic guidance of the basic theory of face hobbing, the development process of all NC face hobbing equipment in China is seriously restricted. Gleason company has developed six axis linkage Phoenix II full numerical control bevel gear milling machine, and Klingelnberg company has developed c series full numerical control bevel gear milling machine, which has achieved good application results in production practice, but its specific implementation method is not disclosed.