Numerical Simulation Research On The Milling Process Of Wind Power Bearing With Ring Gear Formed Milling Cutter

Due to the advocacy of green philosophy, wind energy gain popularity in our country and the demand for wind turbines is also increasing year by year. The yaw bearing, a key adapting piece of the wind turbines, directly affects the reliability of the entire unit. Especially, the processing method of large modulus internal gears which have a rotary support effect in yaw bearing determines the performance of yaw bearing. The generating method is mainly used in the finishing of large modulus internal gears, but this method requires a high transmission accuracy for machine tool, which makes high process cost. So the high-speed gear milling becomes the main processing method for rough finishing and semi-finishing of large modulus internal gears at home and abroad. And thus developing the high-speed gear shaping cutter with indexable has important significance for grasping the core processing technology of wind power slewing bearings and the batch production technology. However, most of design methods used in gear shaping cutter still depend on experience in our country at present and has no specific theoretical basis. Therefore, based on internal gear parameters in the yaw bearing in the process of actual production, a theoretical analysis for wind power bearing formed milling cutter was conducted, and a numerical simulation research on the milling process of wind power bearing formed milling cutter was finished in this article.In order to efficiently complete the accurate removal of excess allowance ring gear, get the resulting geometry approximation of the finished product requirements, and then lay a good foundation for the sequence finishing, many research works had been done as following. Firstly, based on the geometric model of formed milling cutter blades, the profile formula of milling cutter blade was obtained; according to the characteristics of indexable cutter, the installation angle of milling cutter blade was calculated and the geometric model of wind power bearing formed milling cutter was made. Secondly, in Matlab, aim at the specific gear parameters and calculated the gear data of wind power bearing formed milling cutter, the tooth form of molding cutter blades’ involute curve and transition after coordinate transformation were gained; using least square method to analyze the transition curve and then make it fitted with involute, the tooth curve of formed milling cutters was obtained. Finally, based on the required data cutter blade, identifying structure parameters and mathematical model of cutter, three-dimensional of wind power bearing formed milling cutter was established by using Proe three-dimensional CAD software.Based on the analysis to determine the workpiece, the blade material and milling in the milling simulation, by designing single factor milling process simulation program, the paper analyzes the influence law of milling dosage on milling cutter temperature and force. By using four factors and three levels of orthogonal experiment, the paper analyzed milling force and milling temperature simulation results using range analysis, determined the optimal combination of cutting parameters in the milling process. By establishing milling force and temperature nonlinear equation, obtains milling force and temperature empirical formula through orthogonal regression analysis.The research results above-mentioned improved the roughing quality and efficiency, saved processing costs for the further processing of wind power slewing bear. In the meanwhile, the analysis of finite element simulation, variance analysis and the establishment of empirical formula provide some guidance for the selection of milling dosage during the actual processing and the forecast of milling force and temperature.