Thermal Performance Analysis Of Machine Tool Structure And Topology Optimization Of Supporting Components

With the machinery manufacturing industry becoming more competitive and shorter production cycle, improving design efficiency has become an important means to dominate the market. Engineering research and practice show that about 80% of cost of the whole machine life cycle is determined in the design phase, but the cost of this phase is less than 3% of the total cost. The research of "Machine tool digital design and software implementation considering static and dynamic thermal characteristics" not only provides software platform for the digital design, but also supports the development of machine tool toward the trend of high speed, high precision and composite function, and provides technical support to enhance the product performance and design and manufacture efficiency, which is an important part of "High-end CNC machine tools and basic manufacturing equipment".Closely around the goals of subject, this paper develops the thermal analysis module of MATO software, and validates the accuracy of this module by the standard questions, as well as verifies the applicability to machine tools by the thermal performance analysis of a series of the whole machine tools and spare parts. The results of thermal analysis provide data support for the thermal design of machine tools. Moreover, this paper examines the applicability of innovative architecture to key components of CNC machine tools by the topology optimization, and establishes several optimal mathematical models to carry out innovative design of several typical components based topology optimization. The main works of this paper are listed as follows.(1) The thermal analysis module of MATO software is verified by two aspects. One is benchmark example, the other is practical component of CNC machine tool. Both of the validation results show that the thermal analysis results of MATO software is right. In addition, the numerical results are analyzed and valuable data are extracted, which present the direction for improving thermal characteristic of machine tool.(2) Using a mathematical model of static and dynamic collaborative optimization, the optimal saddle of DLH20 machine tool is obtained based on topology optimization. Further, the innovative configuration is designed by simulating the topological optimization result. However, the second frequency of new design reduces much, so the mathematical model of maximizing second frequency is applied, then the initial innovative configuration is improved. Meanwhile, the static and dynamic characters of the final configuration are enhanced.(3) CNC machine tool bed of DLH20 has complex structural form, which combines the two structure of solid and slab. For this structure, it is difficult to get a better topological result by a topology optimization. Therefore, minimizing the compliance and maximizing the frequency of tool bed are separately applied, and the size of inner ribs are optimized. Finally, it is indicated that the stepwise topology optimization can intuitively exhibit the optimal material distribution of tool bed under various conditions, and observe how to distribute the material is beneficial to increase some order frequency. In addition, the static stiffness of the final innovative configuration of tool bed is increased substantially.