The Dynamic Stiffness Optimization Study Of Long Ram Fine Boring Processing Model

Nowadays, with the development of high-speed, high precision, high stiffness direction, but the vibration and stiffness also become increasingly prominent about the Machine tools. How to improve the vibration performance about the system. It has received much more attention. Kinetic analysis of the product is to improve the dynamic performance of the primary means of product which in the product design process plays a very important role.In this paper, for the study of long ram fine boring process model, It brief summarizes the precision boring machine at home and abroad and development status of research in this paper and presents the research significance of this issue.The establishment of long ram spindle fine boring process model of the static model, and analyze the different boundary conditions, the situation of different sizes, different loading boring spindle system static stiffness changes, and explore how to minimize spindle deflection proposed pre-compensation spindle deflection and contact stiffness cutting two methods, both to meet the technical requirements process; and carried out the optimal layout of boring knife.The analysis of the Modal based on the theory of finite element technique was carried out on the spindle system supported in the rigid and elastic boundary conditions which support the dynamic characteristic analysis, and discusses the changes with the support stiffness on the natural frequency of the situation. Using the method of pseudo-material shaft-bearing structures, modal analysis, the change of film stiffness on natural frequency changing; At the same time, Using the dynamic substructure method combined modal analysis composite structure of the natural frequencies and mode shape changes about Spindle-Bearings-Boring Tool system.Establishing the fine boring process structure of finite element model, and analysis about the bed thickness of the base in different sizes, different structure models of dynamic characteristics; while Boring Tool for minimal vibration, up actions of each model stiffness analysis, used to study the Bed base on the changes in the overall system dynamic stiffness of the situation, for optimization of dynamic stiffness. Spindle support column by changing the structure of the form of columns of different support structures, different working speed and cutting force model on the fine boring process dynamic stiffness of the situation on how to enable the optimal dynamic stiffness boring process model, to improve precision.After the improved model of the long ram fine boring process of the overall system dynamic response analysis to explore the boring knife under different excitation frequency, vibration amplitude Boring situation, whether to meet the precision requirements.