The Finite Element Modeling And Numerical Simulation Of Centerless Cylindrical Grinding Characteristic

As a precision machining technique which can get high precision and low roughness, cylindrical centerless-type grinding has an important position in the field of mechanical manufacturing. The dynamic and thermal characteristic in centerless grinding systems will affect the machining precision of the workpiece largely, so it is very pivotal to study the dynamic and thermal characteristic of mechanisms thoroughly to improve machining performances. The thesis belongs to the project of"Simulation of roundness forming in the centreless grinding machine by Wuxi Koyo Mechanical Industry Co.,Ltd."Combined with the development of grinding technology at home and abroad, some researches as followed are studied.Firstly, from the research of the cutting with a simplified single abrasive particle, the theoretical model of the normal grinding force and the tangential force during cylindrical plunge grinding in three phases are proposed. Simulation is completed with Matlab6.5, and the simulation curves of the grinding force are performed. According to the experimental results, the empirical constant q is corrected in order to gain the consistent simulation results, which indicates that the theoretic model proposed in the paper is reasonable and feasible. Based on the analysis foundation, the dynamic analysis and simulation results of the total cylindrical centerless-type grinding system during the workpiece in steady movement, which will make for the force load in the ANSYS.The model of grinding machine housing is carried out with Pro/E, and the finite element model is constructed. After the thermal load and boundary conditions are defined, the steady-state temperature and transient temperature distribution are obtained. By using indirect thermal-structure coupling method, heat distortion of the grinding machine housing is finished. The results indicate that the distortion of spindle system is reduced gradually from left to right, and the max distortion occurs at the front of the above coping, which will help the workpiece improve the machine precision.The model of regulating machine housing and blade are constructed with Pro/E and ANSYS. Through the transient dynamic analysis, it gets the equivalent displacement field, strain field, stress field distribution contour map of the system and their distortions drawing during the grinding process. The thesis proposes some suggestions about reducing distortions of the blade according to the distortion principle. Finally, the distortion of the regulating machine housing which will affect the machining precision is relatively smaller after compared.