Finite Element Analysis Of Machine Assembly Structure

With the rapid development of China's economy,traditional manufacturing can no longer meet the needs of economic development.It must develop toward high-precision and build China's high-end manufacturing.The basis for achieving high-precision manufacturing is the improvement of the precision of numerical control machine tools,and the improvement of the precision of CNC machine tools mainly depends on the structural design of machine tools.Therefore,studying the machine tool finite element analysis method to improve machine tool accuracy and promote economic development has great significance.The important part of the finite element analysis of the machine tool assembly structure is how to properly handle the joint surface.The ball screw joint surface and the linear guide rail slider joint surface are the key and difficult points.Traditional treatment methods include rigid treatment and flexible treatment.In this paper,firstly,the two methods are studied in depth.The two methods are used to analyze the ball screw linear guideway module,and the static analysis is performed under the same boundary conditions.The analysis results of the two methods are comprehensively compared.The advantages and disadvantages of this traditional method.Secondly,aiming at the shortcomings of the two traditional methods,this paper proposes a virtual structure method to better handle the ball screw joint surface and the linear guide rail slider joint surface.This method is applied to the ball screw joint surface and the linear guide rail slider joint surface.All of them have been specially processed,and the method has been applied to analyze the ball screw linear guide module under the same boundary conditions as the traditional method.The comparison of the analysis results shows that the virtual structure method can well compensate for the deficiencies of the two traditional methods.At the same time,the virtual structure method was used to analyze the structural characteristics of the whole motorized and static machine,and the whole maneuvering and static characteristics of the machine tool structure were obtained.It lays a foundation for studying the influence of the linear guide rail stiffness on the static characteristics of the machine tool.basis.Finally,the influence of the rigidity of the linear guide on the static characteristics of the machine tool is studied.The rigidity of the three linear guides of the machine tool was increased to 200% with the amplitude of 10%,and the variation of the deformation of the tool tip and the cut point was observed.The influence of the stiffness of the linear guide on the static characteristics of the machine tool was obtained.In the same way,the stiffness of the three linear guides of the machine tool is increased to 10% to 200%,and the change of the first six-step free modal of the machine tool is observed.The influence of the stiffness of the linear guide on the dynamic characteristics of the machine tool is obtained,which is selected by the designer.Linear guide stiffness and adjustment of the machine tool static and dynamic characteristics provide a reference.