Finite Element Analysis And Optimization For The Structure Of Machine Tool

The technology of machinery and equipment occupies a pivotal position in the manufacturing industry. In order to meet the superior performance requirements from technology progress and national needs, modern machine tool industry are evolving to high-speed, high precision and intelligence-direction development. Therefore, during the research of machine tool technology, it has important significance for shortening product R&D cycle, reducing manufacturing cost, enhancing comprehensive performance and improving competitiveness of enterprise by introducing modern engineering and analyzing methods such as finite elements and structure optimization. The research will ascertain technical performance indexes and design a body of a big crankshaft milling machine and study the static and dynamic mechanical property thereof, by studying a new crankshaft milling machine model provided by a factory and referencing to domestic and international technologies of crankshaft milling machine. The author founds out the deficiencies are related to the longitudinal support ability and dynamic stability capacity through static and modal analysis and analyzing the material selection of the machine tool provided by original manufacturer. According to the results, the author re-designs them and get a new blue print, optimizing the static and dynamic conditions by introducing topology optimization steel fiber concrete filling method. Moreover, based on this research, the author re-modeled parameters of the scheme, and analyzed the new machine tool with statics and modal to accomplish the whole machine tool displacement index, the maximum equivalent stress, modal natural frequencies,mode of vibration and other several results. Comparing with the original lathe bed, the author determined that the new one can be greatly improved in the stability of static and dynamic on the supporting capacity. Afterwards, the author optimized the new machine tool in many indexes, for the purpose of building a variety direction model, which is including a maximum displacement, maximum of equivalent stress minimum index and minimum quality in Y direction. As a result, the author reached not the best modal index and design result but the different optimized results by the influences with chainable parameters. Besides, the author determined the parameters in response to the calculation results were determined and also provided data support for the statics analysis of similar structure.Finally in the premise under that do not change the structure of section, according to the statics and modal analysis on different spaces on three machine tools, separator preset three bed model and analysis of statics and modal change, the author gain the optimum space by comparing the calculated results of the subjects of the machine tool.