Research On Modal Analysis And Topology Optimization Of Key Structural Parts Of Screw Milling Machine

The CNC milling machine for spiral grooves is used to process the screw rotor,the core component of the screw motor and other equipment.With the development of CNC machine tool processing technology,the trend of machine tool processing continues to develop in the direction of high speed,high precision and high efficiency,and the structural performance of machine tool components needs to meet higher requirements.The design of the key structure of the machine tool needs to reduce the simple imitation of the same type of products,improve the structural rationality and material utilization according to the performance requirements of the structural parts,ensure the static and dynamic characteristics of the machine tool,and improve the machining accuracy and performance of the machine tool.Therefore,it is proposed to analyze the static and dynamic characteristics of the key structural parts of the machine tool,and optimize and improve the key structural parts according to the analysis results,so that the improved machine tool structure can meet higher performance requirements.This paper takes the LXK series spiral groove special CNC milling machine as the research object,and uses the finite element analysis technology and the structural topology optimization method to analyze the static characteristics,dynamic characteristics,topology optimization design and size optimization of its key structural parts.The main research contents are as follows:(1)According to the overall parameters and structural characteristics of the special CNC milling machine,a three-dimensional solid model of the LXK series spiral groove special CNC milling machine was established,and the three-part structure of the column,the head box and the motor seat was selected as the key components of the machine tool optimization.Establish the finite element model of the key structural parts of the machine tool after proper simplification,the finite element analysis software is used to analyze the static characteristics and dynamic characteristics of the machine,and obtain the total deformation,stress contour,elastic strain and the first four natural frequencies of the key structural parts of the machine tool.The static and dynamic analysis results are discussed,and the parts that need to be improved and optimized are determined for each structure.(2)The modal test is carried out on the motor base structure of the LXK series spiral groove CNC special milling machine through the test modal analysis method,and the test data results are processed and analyzed.The accuracy of the finite element model is verified by comparing the experimental modal results with the finite element modal analysis results.(3)Through the method of topology optimization,the key structural parts of the screw milling machine are designed by the variable density method respectively,and the new structural model is redesigned and established according to the results of topology optimization,static analysis and assembly requirements of each structure.(4)Based on the principle of response surface optimization,the optimal size of each structure after topology optimization is used as the design variable,the parameterized model of each structure is established,the value range of each size is defined,the response surface is fitted to the structure,and the multi-objective optimization equation is established.The optimal combination of the optimal size of each structural component is obtained.The static and dynamic characteristics and structural quality of the key structural parts of the machine tool before and after optimization are compared.The results show that the static and dynamic performance of the key structural parts of the machine tool after optimization is improved when the quality is reduced.