Static And Dynamic Analysis Of Machine Tool Structures And Structural Design Of Typical Parts

As the key equipment in modern manufacturing, high precision and speed of CNC machine tools have become more and more important to the advanced manufacturing. The performance of a machine tool depends on its static and dynamic characteristics. It is of great significance to study the reliable method for the analysis of the static and dynamic characteristics of machine tools and develop the related software for the design of high-performance machine tools as well. The accuracy and speed of machine tools are closely related to the structural stiffness and the weight. Under the condition of satisfying the structural stiffness and strength requirements, it can not only save the cost, but also improve the performance of machine tool to reduce the weight as much as possible (lightweight). Therefore, it will be helpful for the design of high-performance machine tools to study and develop the design method by applying the advanced technology topology optimization. Under the traction of the requirements, relying on the national science and technology project "CNC machine tools and basic manufacturing equipment", the research on analysis of machine tool's static and dynamic characteristics and structural design of typical parts was carried out. The static and dynamic analysis modules of the software with completely independent copyright towards the design of machine tools were developed. The topology optimization method for design of machine tool's typical parts was studied. A column structure was designed by using the proposed method. The main research works are as the following:1) The static and dynamic analysis module of the software for static, dynamic and thermal analysis and topology optimization design of machine tools was developed, and a typical part's static and dynamic performance was analyzed. The main functions and the whole structure of MATO were introduced, and its capabilities for static and dynamic analysis were verified by a series of classical examples. The spindle box of a machine tool was analyzed by using MATO and ANSYS, the deformed and dynamic characteristics were obtained. The software's capability of dealing with typical parts was verified by comparing the results.2) Structural design of a typical part of machine tool based on topology optimization. According to the theory of topology optimization, multi-objective topology optimization considering statics and dynamics of column of Horizontal Machining center was researched by using OptiStruct, and a new structure design was obtained. The static and dynamic performance was improved obviously, after sizing optimization.3) Dynamic analysis of a whole machine tool considering joint surfaces. The performance of the parts of machine tools can not reflect that of a whole machine tool. In this paper, the guide joint surfaces and the bearing joint surfaces were considered, which were simplified as a series of springs. Based on the assumptions, a modal analysis of a whole machine tool was simulated and the results were consistent with the experimental results.The research was supported by the national science and technology project "CNC machine tools and basic manufacturing equipment" (2009ZX04014-034). The financial support is gratefully acknowledged.