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提出一种通过拉深-压平两个工步使圆形板坯中心区域增厚的工艺,基于控制变量法设计了有限元模拟方案,研究了成形过程,分析了成形中各参数对最大增厚和厚度波动的影响规律,并进行了实验验证。有限元模拟和实验结果表明,随着凸模半径R0与凸凹模间隙D的减小,凸模行程H增加,板料增厚后的最大厚度和厚度波动均显著增加。凸模头部半径R1对增厚效果影响不显著。在不同的工艺参数下,第1步拉深时拉深件侧壁倾角、局部减薄量不同,导致了第2步压平时径向应力和材料硬化的差别,最终形成了板料的均匀增厚和不均匀环形区增厚两种成形方式。
A process of thickening the center of circular slab by two steps of drawing and flattening is proposed. Based on the control variable method, a finite element simulation scheme is designed, the forming process is studied, and the maximum increase of each parameter in the forming process Thickness and thickness fluctuations of the impact of law, and the experimental verification. Finite element simulation and experimental results show that with the decrease of punch radius R0 and punch-to-die clearance D, punch stroke H increases, and the maximum thickness and thickness fluctuation after sheet thickening increase significantly. The punch radius R1 has no significant effect on the thickening effect. Under the different process parameters, the inclination of the side wall and the amount of local thinning in the first step of drawing are different, resulting in the difference between the radial stress and the material hardening in the second step flattening, and finally the uniform increase of the sheet material Thick and uneven annular zone thickening two forming methods.