Research on Double Curved Forming of Sheet Metals Lacking Workability and Bending of Profile Sections

为了使本研究者最初开发的喷丸成形技术能够实际应用，本文建立了一种新的鼓风式喷丸成形装置，得到了以下结果：1.指出了扫掠式喷丸中存在最大有效喷丸能; 1.证实了与材料性能有关的成形性差异是由功的差异引起的; 2.提出了一种新的喷丸成形装置。硬化特性1.在板的弯曲中，提出了通过感测工作板的投影长度来将弯曲角度设定为期望值的新思想，1.从对侧进行喷丸完全抑制了喷丸边缘处出现的下垂。1.半-圆形截面是通过用带有透镜型孔的掩模覆盖的旋转工作段进行喷丸，并向相反方向弯曲而获得的，即对双曲线孔掩模覆盖的板料从对侧进行喷丸，实现马鞍形成形; 1.对双曲线孔掩模覆盖的板料进行喷丸，实现对应于双曲线弯曲的马鞍形成形掩模从相对侧具有双曲线型孔，并且通过上述方式抑制了边缘的下垂。

In order to make peen forming which was developed originally by this investigator possible to apply practically, blower type peen forming apparatus was newly set up and following results were obtained.1.The existence of the maximum effective peening energy in sweeping type peening was pointed out.1.It was confirmed that the difference in formability concerning material properties was caused by the difference in work-hardening characteristics.1.In bending of a sheet, a new idea to settle a bending angle to a desired value by sensing the projected length of working sheet was proposed, and the usefulness was confirmed.1.The droop which was appeared at the peened edge was completely suppressed by peening from the opposite side.1.Bending of a semi-circular section was achieved by peening the rotating work section covered by mask with lens type hole, and bending to the oppesite direction, that is saddleback shape forming was achieved by peening the one covered by a mask with hyperbolic curve hole from opposite side.1.Saddleback shape forming correspond to double curved bending was achieved by peening the bent sheet covered by a mask with hyperbolic curve type hole from opposite side and the droop of the edge was suppressed by the above mentioned way.