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高速精密冲床运转工作时,内部机构质量产生的惯性力作用在机架上,会造成机体的不平衡,引发冲床产生振动,在机械加工时易降低零件的精度和缩短冲床的使用寿命。对高速精密冲床的动态不平衡力和振动模态进行了分析,得出了减小动态不平衡力质量块的最佳质量和平衡效果,从结构改善方面提出了减小振动的方案。首先对某型高速曲柄式精密冲床进行惯性力模型推导,以了解此冲床工作过程的受力,然后利用滑块的配重和杆件质心位置等参数做惯性力分析及比较,最后利用推导出的惯性力作为数值分析计算法的边界条件,在有限元软件ANSYS中分析结构的振动特性,找出部分结构的改良方案,为以后冲床的设计方案提供理论依据。
High-speed precision punch press work, the internal body mass inertia force acting on the rack, will cause the body imbalance, triggering punch vibration, easy to reduce parts in machining accuracy and shorten the service life of the punch. The dynamic unbalance force and vibration mode of the high-speed precision press are analyzed. The best mass and balance effect of reducing the dynamic unbalance force mass are obtained, and the solution to reduce the vibration is proposed from the structural improvement. First of all, we derive the inertia force model of a high-speed crank-type precision press to know the force of the punch during the work process, then use the parameters of the weight of the slide and the centroid of the rod to do the analysis and comparison of the inertial forces. Finally, Of inertial force as the boundary conditions for numerical analysis of the calculation method, the finite element software ANSYS analysis of structural vibration characteristics, to find part of the structure of the improved program for the future punch design provides a theoretical basis.