Structural Optimization Of High-speed Vertical Machining Centre

High-speed vertical machining centre is one of high-grade NC centers which can work in the highest efficiency and can also be widely used in process of nonferrous metal and difficult-to-cut material. With the improvement of working accuracy and working efficiency, key components' static and dynamic properties have become important factors which restrict the development of high-level machining center. So in order to improve the static and dynamic properties of key components, structural optimization of key components must be carried out. The primary objective of this paper is to optimize the key components based on the characters of High-speed vertical machining, so that performance of complete appliance can be improved greatly.Firstly this paper introduces the latest development of structural optimization at home and abroad, and then a summary about the application of structural optimization to machining center is made. According to the characteristics of tradition design, this paper points out the necessity of structural optimization for High-speed vertical machining centre. Subsequently optimization driven technology and finite elements analysis are expatiated, on the other hand ANSYS Workbench and Hyperworks are briefly introduced, optimization procedure is also put forward.Combining theories of finite elements and characters of High-speed vertical machining centre, a suitable finite elements analysis technique and structural optimization method of key components is carried out, including the method based on assembly and setting of complex boundary condition. By doing this boundary condition can simulate working condition better. After that exhaustive analysis of key components is carried out, data from displacement and stress nephogram are propitious to the follow-up sizing optimization and topology optimization.In accordance with the specified process and characters of sizing optimization, important dimensions which affect the properties mostly can be chosen by sensitivity analysis which is based on theory of six-sigma. Then multi-objective sizing optimization based on goal driven is performed aiming at reducing mass of key components as far as possible. New models are rebuilt by the optimization size. By contrasting the results of finite element analysis before and after optimization, effect of sizing optimization can be concluded and can also direct improvement of key components. Finally, in order to improve the performance of key components further, topology optimization is carried out by using the module of Optistruct in Hyperworks. According to the characters of specific parts, this paper presents a method of rebuilding the key components with shell element, and then topology optimization of key components based on SIMP (Solid Isotropic Microstructure with Penalization) is achieved. After topology optimization this paper presents a perfect topology structure, which provides a better blue print for improvement of the key components. In conclusion a suitable finite analysis method and structural optimization of key components is put forward base on the characters of High-speed vertical machining centre.