挠性接头细颈微细磨削仿真研究

摘要

惯性导航关键件挠性接头细颈尺寸小、刚性差,在微细加工中极易变形,其精度很难控制.为了更加明确工艺参数与残余应力间的关系,充分认知细颈结构特征对残余应力分布的影响,形成更加符合细颈结构特征的相互作用机制的残余应力精确预测,以挠性接头细筋为研究对象,基于磨削加工理论、弹塑性力学和有限元等理论,利用专业金属切削软件Advantedge对残余应力进行仿真,构建了单侧及双侧磨削工艺参数对挠性接头细颈残余应力仿真模型,并分析两种模型得出的残余应力分布规律.实现了在现有条件下以加工质量为主要目标,提高加工效率为次要目标对工艺参数进行优化,为实际加工工艺参数的选择提供理论指导.%The thin neck of inertial navigation key pieces flexible joints is size small and weak stiffness, the thin neck is easy to distort in the micro-grinding process, it quite difficult to control the accuracy. In order to know the relationship between process parameters and residual stress more clearly, cognitive well the struc-ture of thin neck characteristics influence on residual stress distribution, and an accurate prediction of the re-sidual stress of the interaction mechanism which is in line with the characteristics of the thin neck structure is obtained. Based on the theory of elastic-plastic mechanics, the residual stress distribution about the thin neck of flexible joint is obtained by using the professional cutting software Advantedge. Simulation model of re-sidual stress about the unilateral and bilateral grinding process parameters on the thin neck of flexible joint are built up, and the residual stress distribution rule of two kinds of model are analyzed. Under the existing conditions, the first and more important is controlling the processing quality. Another one is improving the processing efficiency. All the results provide relevant theoretical basis for parameters selection in the real production.