基于ANSYS有限元法的某型车床主轴振动频率响应分析

Making an analysis for vibration modal and frequency response of the lathe spindle, respectively by using finite element method based on ANSYS and experiment of CA6140 type lathe in machining, and the calculation results are compared and analyzed, which verified the accuracy of ANSYS method. Numerical simulation and experimental results show that: Spindle in the first order and fifth order are prone to resonance, but did not reach resonance, the low order natural frequency have more effect than the high order natural frequency of the spindle vibration; by the experiments can conclude that the maximum vibration of the main shaft in the working state is mainly concentrated in the vicinity of its two ends, therefore, the improved bearing is an important way to reduce the vibration of the main shaft and ensure the machining accuracy, and the research results can provide a theoretical reference for the structural optimization design of the lathe.     

用含硼生铁生产减磨硼铸铁

用含硼生铁取代价格昂贵的硼铁合金，用来生产减磨硼铸铁，简化了生产工艺，降低了生产成本。硼铸铁的组织和性能与采用硼铁合金生产的硼铸铁基本相当。     

高速精密冲床动态不平衡力优化分析与振动特性研究

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.     

面对称结构战斗部破片特性能量分析方法

为获得面对称结构战斗部的破片初速分布规律,基于能量分析的方法,针对棱柱型结构战斗部在内爆加载下的动态响应开展研究.采用修正的Hamilton原理,提出了一种求解面对称战斗部破片飞散特性的工程计算方法.计算结果与试验结果吻合较好,总体分布趋势基本一致,为提高飞行器作战性能提供了重要的理论依据.