Gantry Rail Grinding Machine Structure Optimization Design

Machine tool manufacturing industry is the engine and heart of China’s industry and national economy, especially major technical equipment, such as gantry rail grinder is the embodiment of a nation’s comprehensive national strength, and plays an important role in the construction of the national economy modernization. In recent years, with strong growth in demand of defence, aerospace, high-speed rail, automobile, mould and other important equipment manufacturing industry, the precision, reliability and stability of the grinding machine are becoming more and more important. High-grade gantry rail grinder is necessary to the aerospace, automotive, marine and power generation equipment manufacturing and other fields, is essential to the industry upgrading. The domestic grinding machine industry has long been in the situation of "Low-end infighting, high-end losing". The main reason is the lack of overall design and research and development capability, only staying in imitation stage, no a complete innovation design theory. These foreign processing equipment and technology embargo on China. Therefore, it’s very important that we develop the high-end grinding machine equipment of our own and possess the intellectual property.Source of subject is university-enterprise cooperation projects of Changchun university of technology and Changchun first machine tool plant. This paper has mainly carried on the following work.1, Introduced the present study situation and further development of field of machine tool at home and abroad in detail, compared the gantry rail grinding machine research and development, find out the short board of Gantry rail grinder in the research, development and design in our country.2, The focus of this paper is Gantry rail grinding machine workbench structure optimization design. The static and dynamic characteristics of the workbench were obtained using finite element technology. A multi-objective optimization design method with minimum quality of workbench and largest of first-order natural frequency as goals, and maximum deformation as constraint conditions. Central composite design was used to select suitable structure finite element experiment analysis samples. The quality of workbench, first-order natural frequency, the maximum deformation at the samples were analyzed and calculated with the help of software Ansys workbench. According to the response values, establish quadratic response surface model of input parameters and output response relationship. Kriging interpolation method was used for the interpolation reconstruction to the response surface. The sample points in the design space were extracted evenly and sorted, obtaining a good initial population. Multi-objective optimization design was enforced to the workbench quality and the first-order natural frequency of Gantry rail grinder using NSGA-Ⅱ arithmetic. Pareto optimal solution set was obtained. The Quality of Gantry rail grinder decreased 4.32%, the first-order natural frequency increased 41.08%, under the premise of the workbench’s largest deformation not greater than the initial value. By comparing the dynamic and static characteristics of before and after the optimization, realized the purpose of workbench lightweight design.3, the deformation and stress distribution of Gantry rail grinder were analyzed when the workbench was heated. It can be seen from thermal fluid-solid coupling analysis that heat gradient change had so much more influence on the workbench. Aimed at the situation at home and abroad some measures of reducing thermal strain were summarized.The above research results were applied on the design of the MM52160 Gantry rail grinder by Changchun first machine tool plant, obtaining good dynamic and static characteristics.