薄壁精密罐多道次缩口过程及其机理

Multi-stages necking process and mechanism of precision thin-walled can

基于薄壁精密罐的多道次缩口工艺,分析了各道次缩口材料的变形行为,对首道次缩口与后续道次缩口进行区分,给出在不同道次缩口中缩口入模角的定义,探讨了各道次间缩口行程的控制规律,并利用有限元数值模拟进行了验证,采用专用实验设备所获得的实验结果也证实了该规律,决定了不同道次解析分析的基础不同;基于主应力法推导出了不同道次缩口载荷计算公式,证实各道次缩口工艺中最佳入模角的存在,载荷计算结果与实验结果较为吻合,并计算得出缩口载荷随凹模入模角的变化规律.

Based on the multi-stages necking process of the precision thin-walled can,the deformational behavior of the material in each stage necking process was analyzed,the first necking process and the subsequent necking process was distinguished,and the definition of the die angle was given out.The control law of necking stroke in each process was investigated and verified by utilizing numerical simulation.The experiment results using a special equipment were obtained,which indicate the diverse analytical basement between different necking process.The load computational formula of different necking stages were derived based on slab method,indicate the existence of optimal die angle in each necking process.The calculated load results coincide with the experimental results,and the change of the necking load along with variation of die angle was obtained.