公开(公告)号：US06253588B1

公开(公告)日：2001-07-03

申请号：US09545500

申请日：2000-04-07

申请人： Moinuddin Sirdar Rashid ,  Chongmin Kim ,  Edward Frank Ryntz ,  Frederick Irvin Saunders ,  Ravi Verma ,  Sooho Kim

发明人： Moinuddin Sirdar Rashid ,  Chongmin Kim ,  Edward Frank Ryntz ,  Frederick Irvin Saunders ,  Ravi Verma ,  Sooho Kim

IPC分类号： B21D2602

CPC分类号： B21D26/021 ,  B21D26/029 ,  B21D26/053 ,  B21D26/055 ,  Y10T29/49805

摘要： A method is disclosed for stretching magnesium-containing aluminum alloy sheet stock into intricate shapes such as are required in automotive body panels. The sheet stock, at a temperature in the range of about 400° C. to about 510° C., is stretched under the pressure of a working gas into conformance with the surface of a forming tool. The sheet forming pressure is increased continually in a controlled manner from ambient pressure to a final forming level in the range of about 250 psi to about 500 psi or higher. A portion of the sheet can experience strain rates substantially higher than 10−3 sec−1 and the forming of the sheet can be completed within 12 minutes.

摘要翻译： 公开了一种用于将含镁铝合金板料拉伸成汽车车身板中所需的复杂形状的方法。 在约400℃至约510℃的温度范围内的片材在工作气体的压力下被拉伸以与成形工具的表面一致。 片材成形压力以约250psi至约500psi或更高的范围内的环境压力以最终成形水平的受控方式连续地增加。 片材的一部分可以经历基本上高于10-3秒-1的应变速率，片材的形成可以在12分钟内完成。

公开(公告)号：US5974847A

公开(公告)日：1999-11-02

申请号：US89634

申请日：1998-06-02

申请人： Frederick Irvin Saunders ,  Paul Edward Krajewski ,  Edward Frank Ryntz ,  James Gregory Schroth

发明人： Frederick Irvin Saunders ,  Paul Edward Krajewski ,  Edward Frank Ryntz ,  James Gregory Schroth

IPC分类号： B21D26/055 ,  B21D26/02

CPC分类号： B21D26/055 ,  Y10T29/49805

摘要： A method is disclosed for stretching sheet blanks, especially superplastic sheets, by differential gas pressure into conformity with a female die surface without encountering excessive thinning or tearing of the sheet. The warmed SPF sheet is draped over a preformed surface to draw more of the sheet material into the die cavity before the edges of the sheet are fixedly clamped whereby the additional formable material is used in forming the product, thereby reducing thinning and tears.

摘要翻译： 公开了一种用于通过差分气体压力将片材坯料，特别是超塑性片材拉伸成与母模表面一致的方法，而不会遇到片材的过度变薄或撕裂。 将预热的SPF片材覆盖在预成型的表面上，以便在片材的边缘被固定夹紧之前将更多的片材材料吸入模腔中，由此在形成产品时使用另外的可成形材料，从而减少变薄和撕裂。