Study On Dynamic Design Of Vertical Grinding Machine Based On Grey System Theory

The vertical grinding machine is a high precision machine tool, which is mainly used of ring-shaped and disc type parts. With the development of the machine tools to high efficiency, high accuracy and high quality, the dynamic and static performances of the machine tools become more important. In this paper, based on axiomatic design theory, the original structure of the vertical grinding machine is established. Then, based on the dynamic design principle and the results of the finite element analysis, the original structures are improved, and some design candidates are proposed. Finally, the dynamic and static performances of the candidates are comprehensively evaluated by grey correlation evaluating method. These provide a new vision for rapidly designing and prioritizing the machine tool. The specific content are as follow:(1) The vertical grinding machine development and the research status of the related technologies are elaborated. The content and significance of this project are summarized.(2) The market demand of the vertical grinding machine is analyzed, and based on the axiomatic design theory, the mapping model between the function domain and the structure domain is established. Then, two original structure of the vertical grinding machine, the gantry gate structure and column structure, are established considering the principles of the precision machine tools design.(3) The dynamic and static performance of the two original vertical grinding machines are analyzed. According to the results of the finite element analysis, the weak parts are found. The module structures are improved in figuration, arrangement of ribs and the size of the ribs etc. aspects. Then, the improved modules are recombined and 36 design candidates of vertical grinding machine are established.(4) The grey correlation evaluating method is elaborated. Comprehensively considering the dynamic and static performance and the cost, the design candidates are evaluated. Then, the best candidate and the best product candidate can be selected. All performances of the best candidate and the best product candidate are better than the original. This shows the improvement is good.(5) The correction of the finite element model considering the model test result is studied. The modal test of the column style vertical grinding machine is made. According to the modal test result, the accurate finite element model of the machine tool is established by inversion method, which is an effective method.