The Research On Distribution Of Milling Force And Milling Temperature In Wheel Groove Machining And Milling Insert Design

The steam turbine is mainly composed of two parts of the rotor and the stator. The rotor is the power part of the steam turbine. Its processing quality directly affects the performance of the entire turbine. While the processing of the rotor fir-slot wheel groove is the most crucial and difficult part of rotor machining process. Fir-slot milling cutter is a special cutter in the machining of the rotor fir-slot wheel groove. Its performance directly affects machining accuracy, surface quality and processing efficiency of wheel groove. At present, the research and manufacturing of fir-slot milling cutter is still at the starting stage in the domestic, especially the fir-slot fine milling cutter the biggest influence on the wheel groove accuracy. Therefore, this study is based on fir-slot fine milling cutter has carried out as follows.Based on the types and characteristics of the rotor wheel groove and based on the requirement of wheel groove milling process, wheel groove milling process was analyzed respectively from the aspects of the wheel groove material, tool material, the design of wheel groove cutter and the actual processing condition. A reasonable wheel groove milling machining allowance and machining process was analyzed and formulated.Based on the theoretical analysis, a mathematical model was established of milling insert and milling force of tipped milling cutters. It provides a theoretical basis for research and manufactures a tipped fir-slot fine milling cutter.Based on the micro-element method, milling force and milling temperature was analyzed and modeled in the fir-slot wheel groove milling process. Then milling force and milling temperature distribution of the points on the wheel groove was obtained through the milling test. It provides a test basis in order to optimize the wheel groove milling process and improve the machining precision of the wheel groove.Based on the above analysis and research, in view of each cutter tooth type line and the cutting amount of tipped fir-slot milling cutter is different, It designs a milling insert respectively for each cutter tooth. After3D milling simulation is carried out on each milling insert by using DEFORM-3D finite element analysis software and milling force, milling temperature, cutter wear and chip are analyzed respectively on the influence of milling insert in milling process. It provides a useful reference in order to optimize and design the tipped fir-slot fine milling cutters.