Hot single-point incremental forming assisted by induction heating
Hot single-point incremental forming assisted by induction heating
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DOI：
10.1007/s00170-015-7439-x
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发表时间：
2016-02-01
影响因子：
3.4
通讯作者：
Landgrebe, Dirk
中科院分区：
文献类型：
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作者：
Al-Obaidi, Amar;Kraeusel, Verena;Landgrebe, Dirk
传统的单点增量成形难以成形高强度板材；使用这种工艺生产的成形零件几何精度下降，成形性值低。本文研究了一种热单点增量成形新工艺。通过将板料正面的增量成形和板料背面的感应加热相结合，对该方法进行了简化。工艺设置基于基本工装；它利用工具与电感器的同步运动。局部加热区允许高级高强度钢的平滑成形。以DC04为对照物，通过优化工艺变量之间的正确关系，控制适宜的升温速率。研究了影响操作的过程变量，包括步长、感应功率和进给速度。该方法已经过测试并成功改进。结果表明，该工艺改善了dp980钢的成形性能，降低了其残余应力。另一方面，可以减小回弹，提高22MnB5钢的几何精度。此外，在感应加热的支持下进行增量成形时，成形力显著降低。研究结果为解决高强度金属的成形问题提供了一种有效的方法。
High-strength sheet metal materials are hardly formed by conventional single-point incremental forming; the formed parts produced using this process exhibit decreased geometrical accuracy and low formability values. In the present study, a new process is investigated for hot single-point incremental forming. The method was simplified by combining incremental sheet metal forming on the front side of the sheet and induction heating on the backside of the sheet. The process setup was based on elementary tooling; it utilizes synchronized movement of the tool with the inductor. The locally heated zone allows smooth forming of advanced high-strength steels. The appropriate heating rate was controlled by optimizing the correct relationships between the process variables by using DC04 as a reference material for comparison. The process variables affecting the operation have been investigated and are the step size, induction power, and feed rate. This method has been tested and successfully improved. The results show that the formability improved and that the residual stress of DP 980 steel decreased. On the other hand, it was possible to diminish the springback and to increase the geometrical accuracy for 22MnB5 steel. Furthermore, a major reduction of the forming forces was noticed while incremental forming was performed and supported by induction heating. The significant results demonstrated a method to solve the forming problems of high-strength metals by induction heating at forming.