Structural Design Of Machine Tool Support Based On Truss Topology Optimization

"Made in China 2025" puts forward the strategic goal of realizing a strong manufacturing country.Developing a group of high-precision,high-speed and high-efficiency high-end CNC machine tools is an inevitable way to enhance China’s manufacturing innovation and development capabilities and international competitiveness.The machine tool support is an important part of the machine tool.The structural design of the machine tool directly affects the final performance of the machine tool and the quality of the machined part.Designers have been actively exploring the design method of high quality support parts.At present,the design of machine tool supports is based on analogy and experience,and the design results are too conservative.The products are large and cumbersome,and waste materials.In this paper,the structural characteristics of the machine tool support are summarized.The method of structural design of the machine tool support is proposed by truss topology optimization.The design of the support member is carried out from the perspective of structural force.The ANSYS Workbench was used to optimize the size to obtain an alternative,and the TOPSIS method was used to optimize the solution to determine the final result.The main research contents are as follows:(1)The development history of structural optimization is briefly introduced,and the research status of discrete and continuum and TOPSIS methods at home and abroad is reviewed.Aiming at the problems existing in the design of machine tool support structure,a design method of machine tool support structure based on truss topology optimization is proposed.(2)By analyzing the structural structure of the support members,the design characteristics of the machine tool support members are summarized,and the topology optimization design method of this paper is derived.Based on the finite element model of high-order Euler beam element,the finite element model of truss is established,and the mechanical properties of truss structure are given.Based on this,the topology optimization design of truss is carried out.(3)The base structure method is used to optimize the topology of the truss structure.The finite element mesh method is used to establish the discrete model of the truss design domain.The base structure is obtained by the joints of the members,and the optimization mathematical model is established.The truss topology is optimized under the given optimization constraints and targets.The obtained truss structure configuration is the structural configuration of the support.(4)The structural characteristics and working conditions of the support are analyzed,the truss design field of the machine support is determined,and the load condition of the machine support is equivalent to the nodal force of the truss structure topology optimization,and the truss structure design of the support is realized.The finite element analysis software ANSYS Workbench was used to optimize the feature size of the support structure,and the TOPSIS method was used to optimize the solution to determine the final optimization plan.(5)The structure design and scheme optimization of the column of a vertical machining center are carried out by this method.The final structure is compared with the performance of the original scheme.The maximum deformation is less than 5% and the weight loss is 3.8%.The analysis results verify the effectiveness method of this paper.