| In view of the high speed, high precision, high efficiency development of modern machinery manufacturing industry, it is particularly important for technical reforming and technical research of machine tool products. The CAE technology has become an indispensable part in research and development. And it can determine the dynamic and static characteristics at the designing stage so as to improve machine precision and efficiency and shorten the development cycle and cost savings to avoid unnecessary waste. YK series of high-speed CNC gear hobbing machine is the developed high-performance gear cutting machine tool in recent years, and the column is the key of the machine tool parts, whose stiffness and vibration directly affects the accuracy of machine tools. In the topic to YKQ31300 CNC hobbing machine column as the research object, building mathematical model for optimization of column design based on the column of static and dynamic characteristic analysis.The paper find out the main characteristics of the simplified model structure firstly, and using Solidworks for the modeling of gear hobbing machine column and parts assembly. Then models are imported in the ANSYS Workbench software, added the component properties, and finally the finite element mesh model is finished.For the column of CNC machine tool, statics analysis is applied. According to calculation of X, Y, Z direction of static stiffness and strength, the distribution law of stress and strain are obtained. That study the column of the hobbing machine of stiffness and strength meet the precision requirement, even far below the yield strength, so the column need remove material to reduce the column quality.For the column of CNC machine tool, dynamic characteristics analysis is applied. Through studying pillar modal analysis, among the pillar of the first three order natural frequency, the numerical values are similar, and vibration mode are respectively around the Z axis to do before and after swinging around, back and forth, and composite torsional vibration. In addition the pillar of the last three order natural frequency values are similar, and vibration mode are respectively around the Z axis do shrinkage, the compression and lateral breathing vibration in all directions. Through harmonic response analysis research, column of top six order modal frequency is greater than working speed and the maximum design speed of hob spindle of two speeds corresponding excitation, therefore, the dynamic stiffness of the column meets the requirements of cutting.The optimization of lightweight design is studied in the end. Based on selection of rib structure research for the column at home and abroad, the cross-rib structure is optimized. After determining structure, using experimental design method optimizes the design of the structure size and combining with the manufacturing process yields the final optimized design dimensions. The outer wall is selected as 30 mm, rib thickness selected 18 mm, the front rib height selected 273 mm, and side rib height selected 109 mm, and back rid board height selected 104 mm. Compared with the original column without affecting its static and dynamic characteristics of the column the column of quality is reduced by 18859 kg to 18660 kg.That is to say the column reduces 199 kg, decreased 1.05% by weight. |
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