Study On Basic Applied Technology In The Process Of Digitized Manufacturing For Spiral Bevel Gear

Spiral bevel gear drives are widely used in the intersecting axis transmission with its high contact ratio, transmitting smoothly, lower noise, higher strengthen and large transmission ratio, such the machinery as transports, construction machinery, mining machinery, aviation and so on. With the development manufacturing, there is a great demand for it. Manufacturing spiral bevel gear efficiently with High Quality is the aim of gear industry, digitized manufacturing for spiral bevel gear is the main way to achieve it. Core of software of digitized manufacturing is Tooth Contact analysis(TCA) and correction of the error of tooth surface, which has great disparity with the western developed country. Based on the latest research results of the meshing theory and by means of computer simulation, stability and running speed in the TCA running process, accuracy of TCA result, essence of correction of the error of tooth surface is research systematically.In the thesis, the research achievements and creative include:1. Mathematical model of spiral bevel gear is built based meshing theory and manufacturing method, Method of 3D solid modeling of spiral bevel gear with accurate gear tooth surface based on manufacture method and theory of meshing was developed, Surface deviation method was given to analyze accuracy of the model, the method can be used to analyzed the model get by tooth cutting simulation as well.2. To improve stability in the process of TCA running, number of equations used for TCA is reduced to three.3. The classical approach to acquire the instantaneous contact region, based on differential geometry, was expanded with the second-order Taylor-series, which will affect accuracy of result. Both equations and procedure based on the hertz theory for determine the instantaneous contact region is complicated. A new method with numerical solutions to derivate instantaneous contact region is developed in the thesis, which is free of the disadvantages mentioned above4. Result of contact region by traditionally TCA method is plane, by the method proposed in the thesis Three-dimensional contact region can be obtained, which is more direct. 5. Equations of surface corrections are derived based on coordinate measurement, Essence of correction of the error of tooth surface is revealed by functions between correspond orders of error surface and machine settings.Based on research results of the thesis, Manufacturing and detecting software for spiral bevel gear and hypiod gear complete set numerical control manufacturing equipment can developed.The thesis is supported by national"863"project of china: precise and effective complete set manufacturing equipment for auto mobile spiral bevel gear and hypiod gear(No. 2007AA042005).