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12. 发明授权

US4829803A Method of forming box-like frame members 失效
标题翻译：形成盒状框架构件的方法
公开(公告)号：US4829803A
公开(公告)日：1989-05-16
申请号：US193815
申请日：1988-05-12
申请人： Ivano G. Cudini
发明人： Ivano G. Cudini
IPC分类号： B21D11/18 , B21D26/033
CPC分类号： B21D26/033 , B21D11/18
摘要： A box-like frame member is formed by compressing an internally-pressurized tubular blank within a die having a cavity conforming to the final box-like cross section desired for the product, and increasing the pressure to exceed the yield limit of the wall of the blank to expand the blank into conformity with the die cavity. The blank is selected so that the final product and the die cavity have a circumference preferably no more than about 5% larger than the circumference of the blank, to avoid weakening or cracking of the blank through excessive circumferential expansion. The internal pressure forces the blank evenly into the corners of the die on closing and allows the blank to be confined within the die without sections of the die pinching the blank on closing of the die.
摘要翻译：通过在具有符合产品所需的最终盒状横截面的空腔的模具内压缩内部加压的管状坯料而形成盒状框架构件，并且增加压力以超过该壁的壁的屈服极限空白以使坯件膨胀成符合模腔。选择坯料使得最终产品和模腔具有优选不超过坯料周长大约5％的圆周，以避免坯料通过过度的周向膨胀而变弱或破裂。内部压力迫使坯料在关闭时均匀地进入模具的角部，并且允许坯料被封闭在模具内，而不会在模具封闭时模具的部分夹紧坯料。

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