The bimetal sheets products obtained by the incremental forming are gradually widely used because of the excellent properties of the bimetal sheets. But the forming process of the bimetal sheets is more complicated than that of single metal sheet because this process involves a complicated interface of the bimetal sheets. A three-dimensional model including the tool, the bimetal sheet and the cohesive element between the bimetal sheet has been suggested to discuss the bulge defect affecting the accuracy of incremental forming. And the analysis results have been compared with the experiment results to verify the correctness of the simulation model. The analysis show that the reason of bulge defect is the inconsistent stress state on the upper and lower surfaces of the sheet. Moreover, the results also indicate that the step down size is the most critical factor affecting the bulge height, the height of bulge defect increases by 133% as the step down size increase. In addition, it is found that different parameters also have a great impact on the interface status of the bimetal. Effecting optimization parameter have been proposed to reduce the bulge defect by 53%.

通过增量成型获得的双金属片产品由于双金属片的优异性能而逐渐被广泛使用。但是双金属片的形成过程比单金属片的形成过程更复杂，因为该过程涉及双金属片的复杂界面。已经提出了包括工具，双金属片和双金属片之间的粘结元件的三维模型，以讨论影响增量成形精度的凸起缺陷。并将分析结果与实验结果进行比较，以验证仿真模型的正确性。分析表明，凸起缺陷的原因是板材上下表面的应力状态不一致。此外，结果还表明，台阶尺寸是影响凸起高度的最关键因素，随着台阶尺寸的增加，凸起缺陷的高度增加了133％。另外，发现不同的参数也对双金属的界面状态有很大的影响。已经提出了有效的优化参数，以将凸出缺陷减少53％。