马鞍面件柔性夹钳多点拉形实验与数值模拟

为了扩展柔性夹钳在板材多点拉形中的应用,对马鞍面件进行了柔性夹钳多点拉形实验.实验结果显示,工件被夹持边缘且呈曲线性,验证了柔性夹持技术的可行性.通过标记圆法测量了各标记圆拉形前后的厚度和长度方向的直径；对马鞍面件柔性夹钳多点拉形过程进行数值模拟,通过模拟结果发现离散夹钳实现了柔性夹持,并且成形件的应力、拉伸应变和厚度分布均匀.实验值和模拟值的对比结果表明,各标记圆长度的拉伸率分布趋势一致,最大偏差为0.21％,而且各标记圆厚度减薄率的分布趋势也基本一致,最大减薄量偏差为0.02 mm,从而验证了数值模拟的正确性和柔性夹钳拉形机的实用性.

Multi-Point Stretch Forming Experiment and Numerical Simulation of Saddle Part with Flexible Clamp

Flexible clamp stretch forming experiment of saddle part was conducted to widen the applications of flexible clamp to multi-point stretch forming.The edge line of formed part gets curved,which verifies the feasibility of flexible clamping technology.The thickness and diameter along the length direction of marked circles are calculated.The multi-point stretch forming process of saddle part with flexible clamp is simulated,the numerical results show that the discrete clamp is able to realize the goal of flexible clamping,and the stress,stretching strain and thickness of saddle part are uniformly distributed.A comparison between the experimental and numerical results shows that the length stretching ratios of all marked circles trend to distribute similarly,the maximum deviation is 0.21%;the thickness thinning ratios of all marked circles do so,and the maximum deviation of thickness thinning value is 0.02 mm.