Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Gear cutting and gear machine > Milling and milling machine

Structure Optimization of Large Spiral Bevel Gear Milling Machine

Author PangYongJun
Tutor ZhangLianHong
School Tianjin University
Course Mechanical Manufacturing and Automation
Keywords Large Bevel Gear Milling Machine Structure Optimization Finite element analysis Topology optimization Parametric modelling
Type Master's thesis
Year 2010
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Recently several dozens years, with the development of large scales and high accuracy of profession main engine equipment in petroleum, metallurgy, automobile, water and electricity, coal areas in our country, demand of large-scale spiral bevel gears becames more and more for the processing more than 1000mm in diameter. It is necessary to finite element structural analysis, optimization and other modern design methods for milling machine product design in order to improve design quality, meet the large arcl bevel gear forming technology needs.The structure of design of YK22160 heavy CNC bevel gear cutting machine is more optimization in its high dynamic, static stiffness and light weight in this paper, provide a strong scientific basis to reduce machine manufacturing costs and improve the competitiveness of enterprises.A arc bevel gear milling machine finite element model is set up in YK22160 heavy CNC arc bevel gear cutting machine, especially different lattice topology model of variable density are set up in the main parts. Python scripting language is used to implement the topology change in case of machine assembly and to achieve combination of the parameter optimization and topology optimization. Firstly, keeping parts under the same structural parameters, analyze the finite element of different combinations arising from selected different topological forms of parts of machine, select the optimal topology combination of quality and stiffness. Secondly, analyze sensitivity of key structural parameters of optimal topological combination, removing some structural parameters that have little effect on the mass and stiffness. Finally, regard the structural parameters screened out as design variables to test design, establish approximation model of response surface by regression analysis of analyzing the results; optimize approximate model using genetic algorithm and determine the machine stiffness increased degree under different weight loss indicators, the results of optimization was validated by the finite element model. Constraint conditions are met, obtained results of 10% weight reduced and 21.4% stiffness increased through the topology composition and optimization of the structure parameters.A large arc bevel gear milling machine for the object in this paper, summed up a relatively complete structural optimization design method of complex manufacturing equipment, architecture and technical process, established technical systems of optimal design, provides a new method for other large-scale complex manufacturing equipment structural optimization.

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