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对汽车发动机盖内板的成形过程进行了研究,基于数值模拟的方法对其成形过程进行了有限元仿真分析,得到零件的成形极限图和厚度变化图,并以此来判断成形效果。针对成形过程中出现的拉深不足和起皱等缺陷,通过反复调整工艺参数和拉深筋尺寸及分布,得出了较好的零件成形状态,零件的最大减薄率为22.8%,最大增厚率为5.9%。根据该工艺方案进行了实际冲压试验,通过比较仿真分析与试验结果不同测点位置的厚度,其偏差小于3%,从而验证了两者的一致性。研究结果表明,数值模拟分析用于板料成形分析是可行的,能够提高设计生产效率。
The forming process of automobile engine lid inner plate was studied. The forming process of the automobile engine lid was simulated by finite element method based on numerical simulation. The forming limit and thickness variation of the part were obtained and used to judge the forming effect. Aiming at the defects of insufficient drawing and wrinkling in the process of forming, the forming state of the part is obtained by repeatedly adjusting the process parameters and the size and distribution of drawbead. The maximum reduction rate of the part is 22.8% The thickness is 5.9%. According to the process scheme, the actual stamping test was carried out. By comparing the thicknesses of the different measuring points of the simulation analysis with the test results, the deviation was less than 3%, thus verifying the consistency between the two. The results show that numerical simulation is feasible for sheet metal forming analysis and can improve the design and production efficiency.