珩磨顶杆的有限元分析及结构优化

小顶杆是珩磨工艺中最容易损坏的零件之一,主要原因是杆顶端螺纹处产生应力集中和顶杆中部产生弯曲变形。用ANSYS有限元分析软件完成建模后对小顶杆进行应力及变形分析。根据变形图和等值应力分布云图分析得出,螺纹连接是整体结构的薄弱部分,应力集中主要出现在前3道螺纹处,这是导致小顶杆损坏的直接原因。据此提出了小顶杆结构优化的改进方案,并进行有限元分析验证,得出螺纹最大Von Mises应力由改进前的108MPa降低为98MPa。为杆类结构和螺纹连接设计提供了理论依据,对螺纹连接在工程实际中的推广使用有着重要的意义。

Finite Element Analysis and Structural Optimization for Honing Mandrel

Small mandrel is one of the components in honing process,which can easily be damaged.The main reason is that thread stress concentration may occur at mandrel apex and bending deformation may occur at central plunger.Stress and deformation of the mandrel is analyzed after modeling using a finite element analysis software ANSYS.According to the deformation diagram and equivalent stress distribution cloud chart,we come to a conclusion that threaded connection is the weak of the overall structure,where the stress concentration should occur at the first 3 threads,which may cause directly the damage of the small mandrel.Therefore,improvement plan for structural optimization is proposed and finite element analysis is applied to verify the plan.Thus the max.Von Mises stress of the thread is decreased to 98MPa from 108MPa before improving.It provides a theoretical basis for the design of lever structure and threaded connection,which is significant in promoting the use of threaded connections in the engineering.