Based On The Finite Element Of Machine Parts Structure Characteristic Analysis And Optimization Design

The machine tool bed is the most important basic component of numerical controlled machine tools. All the other parts of machine tools are installed in the machine tool bed. Machine bed bear a large load. Therefore machine tool should have sufficient, rigidity and good dynamic characteristics Static and dynamic characteristics of machine tools will directly affect the static and dynamic characteristics of the whole machine,which affects the machining accuracy. So designers should focus on the static and dynamic design.of machine bed. In this paper,the static and dynamic characteristic of GT650 special machine bed are analyzed,and its structural is optimized.Detials are as follows:According to the design drawings, using SOLIDWORKS software, finite element modeling was carried out on GT650 machine tool lathe bed, and then imported to the ANSYS software. Based on the static analysis module in the software, obtain the maximum displacement when the bed is under the static force. It laid the foundation for the optimization of the structure of the bed. Secondly, through modal analysis of a lathe bed, extracting the former six natural frequencies and principal modes, find the weak points. Using cell structure optimization theory, analyze and find the cell structure of great dynamic characteristic. Analyze its parameters and obtain the reasonable parameter range. On the premise of not increase the weight of the machine tool bed, and improving the natural frequency of the tool bed is the optimization goal. The optimized structure is applied to the lathe bed of stiffened plate layout, raised the low order natural frequency of the tool bed. On this basis, according to the overall characteristics of the bed, open a square hole in the middle of the bed and add anchor bolt constraint at the bottom of the bed. Improved the bed structure again and raise the natural frequency and the dynamic performance of lathe bed.