Based on machining principles of spiral bevel gear and coordinate transformation matrix, the formate-cut wheel model was built. The gear tooth surface of the model has controllable error and can be imported into the Virtual Gear Measuring Center (VGMC) to be virtually measured. The various factors that affect the gear model accuracy were analyzed and the error control strategy was proposed, which lays a solid foundation for the realization of the gear tooth surface measurement and error analysis of spiral bevel gears.

In the grinding of high speed steel, the high temperature grinding zone often leads to poor surface quality such as grinding burn, micro-cracks and tensile residual stresses. In the paper, the cooling-air technology was adopted to study the grinding of high speed steel. The experimental results show that cooling-air grinding can effectively restrain the grinding burns, reduce the surface roughness value and improve the surface quality in comparison with dry grinding.

The grinding wheel-profile is mostly formed by adjusting the angle of cylindrical profile model when regrinding gear hob with the large helix flute. Repeat trial cutting is needed with this method, which results in low efficiency. In order to improve the efficiency of processing, a mathematical model of grinding wheel profile was establish in according to forming principle of the rake face of gear hob and accurately calculate grinding wheel-profile. A automatic programming system of calculating grinding wheel-profile and automatically generate NC code is developed with the developing tool of VC++.

Grinding wheel diameter is one of the most important parameter during the entire process of hob relief grinding and it must be analyzed and tested to avoid interference during the relief grinding. Graphical analytical and calculation method is proposed in this paper. Relief grinding interference issues are graphically analyzed and the formulas of relief grinding interference are derived. The interface is designed to calculate the maximum grinding wheel diameter of different parameters hob [1]. This method provides the basis for selecting grinding wheel rationally.

A numerical control (NC) reformation scheme is presented to reduce the failure rate and improve the performance and efficiency of the old gear shaving machine. On the basis of study the mechanical structure and shaving methods, the numerical control system 828D and the servo driver S120 developed by Siemens Company are used to replace the old control system. The diagonal shaving method is selected to design shaving program after analysis of the process route. The reformation completed parametric programming, realized numerical control of the shaving machine and improved the reliability and flexibility of the system.