The Structural Optimization And Design Of The Large Machining Center Based On Multi-objective Optimization

The Large machining centers has become a high-end equipment manufacturing tools,in the terms of China’s military, defense, aerospace chemical, metallurgy, mining, wind power generation,With the release of the national long-term science and technology development plan (2006-2020)". there are an irreplaceable role in the military defense and national economic construction, but because our domestic development time of large equipment manufacturing product is short, there is still improving much room about manufacturing technology, Therefore, we need to upgrade our own heavy equipment manufacturing technology, The topic is the type of MKM5115X120F-00001developed for Tianjin Second Machine Tool Plant, a large processing center, The Large machining center optimization goal is lightweight, Constraint condition is stiffness, To optimize the structure design, improve the stiffness of the machining center, to reduce its manufacturing costs.Establishing overall finite element model of a large machining centers in this article, The structural features of the machine and its key components is analyzed, Detailed elaboration of the static and dynamic characteristics of the machine and key components of large machining centers and lightweight design process, The specific contents are as follows:1. Structural Analysis, First of all, the use of three-dimensional software to create three-dimensional model of the machine and its key components, Analyzing the whole composition and structure of the key components, The whole machine is composed of seven major pieces, Member structure is composed by the same well-shaped rib.2. Quality Analysis, To analyze the quality of the machine component parts, and calculate the proportion occupied by the quality in the whole of the machine parts. Finally, analyzing the biggest part of the proportion of bed, column, beams occupy to make lightweight design.3. Finite Element Analysis, the use of large-scale finite element analysis software AB AQUS, First of all, the bed of the machine and its key components, columns, beams static analysis and dynamic analysis, Analysis of the static and dynamic characteristics of the whole original state, Machine and key components of the stress cloud and strain nephogram, At the same time, the machine and key components of the order vibration frequencies and modes nephogram4. Structural optimization. Conduct sensitivity analysis through the impact factors of the experimental design of the machine and its key components, Screened sensitive factors that impact on the whole quality, and not sensitive factors that impact on the natural frequency of the machine to conduct structural optimization design, Then through the experimental design and response surface method to establish the machine and key components of the multi-objective optimization mathematical model, Finally MATLAB solving multi-objective mathematical model to provide a reference for the processing center of the design improvements, Provide a reference for The Large machining center of the design improvements,This article through the finite element analysis and structural optimization of large-scale machining center, Scientific design optimization methods have been proposed, when reducing the quality of the machine,and Maintaining the natural frequency,improving stiffness, providing a reference for subsequent processing center improvements, reducing manufacturing costs, and improving the economic benefits of the company.