Structure Finite Element Analysis Of Direct-Drive A/C Axis Bi-Rotary Cnc Universal Milling Head

With the rapid development of modern manufacturing industry, research of five axis CNC machining technology in China has made great progress. The five axis NC machining center that with high precision and high rigidity and can realize high speed processing has become a target that modern processing technology to achieve. Therefore, researching and developmenting of five axis linkage CNC machine tools system and its core components And homebreding the core function component, it has the vital significance to our country to improve equipment manufacturing level and enhance the comprehensive national strength.Direct-drive A/C axis bi-rotary CNC universal milling head is the core component of Five axis CNC milling machine .Both A and C axis are also direct drived by torque motor, eliminating the gear, worm and other intermediate transmission links, It has many advantages such as compact structure high precision and low fault rate. The performance of whole CNC machine tools is largely determined by structure and performance of Bi-rotary Milling Head, so it is particularly important to analysis and research on structure and thermal characteristics of Bi-rotary Milling Head and finally achieving the optimization objective of it. The subject has analyzed the thermal characteristic, static characteristics and dynamic characteristics of Bi-rotary Milling Head. Specific analysis is as follows:The structure characteristics of Direct-drive A/C axis bi-rotary CNC universal milling head has analyzed and the advantages and disadvantages of Milling head structure has expounded. The structure model of Bi-rotary Milling Head has established by Pro / Engineer 3D graphics software and has simplified in the addition of analysis results are not affected by the circumstances and the model is introduced into finite element analysis software ANSYS, a finite element model has built. The head thermal characteristic of Bi-rotary Milling head has analyzed, the steady-state temperature field and transient temperature field of Milling head have been identified in thermal equilibrium state and have an analysis of thermal structure coupling, the A/C axis thermal deformation has calculated; a thermal error compensation model has established in the ideal and the actual state respectively; the thermal error compensation program has set according to the model. The thermal error compensation system has established, The static of Milling head has analyzed, the deformation and stiffness of Milling head along the X,Y,Z direction has tested under external loads; the dynamical modal of Milling head has analyzed, the first three order natural frequency and vibration mode of Milling head has tested. Finally, the full text of the analysis results are summarized, the analysis results and data provide a basis for improvement and optimizationmilling of Milling head structure.