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使用有限元软件Ansys Workbench对机床床身进行模态分析,确定了激振频率、支撑点、激振点等工艺参数。对床身进行谐响应分析,得到床身在固定激振力作用下的动应力大小。结果显示,当激振力为40 kN时,床身产生的动应力符合振动时效要求。根据模态分析和谐响应分析得到的振动时效工艺参数,对机床床身进行振动时效试验。利用盲孔法对振动时效前后床身的残余应力进行测量,振动时效后床身的残余应力明显减小。
Finite element software Ansys Workbench was used to carry out modal analysis on machine tool bed, and the process parameters such as excitation frequency, supporting point and exciting point were determined. The response of the bed to the harmonic response, get the bed in the fixed excitation force under the action of the dynamic stress. The results show that when the exciting force is 40 kN, the dynamic stress generated by the bed meets the vibration aging requirements. According to the modal analysis of harmonic response obtained by vibration aging process parameters, the machine bed vibration aging test. The blind hole method was used to measure the residual stress of the bed before and after vibration aging, and the residual stress of the bed after vibration aging obviously decreased.