发明名称 |
Blanking and forming tapered wall articles |
摘要 |
A method of producing blanks and shaped articles therefrom from sheet material comprises the steps of supporting the sheet material on a blanking die having a substantially cylindrical entrance aperture, an exit aperture and an inwardly converging transition zone extending from the entrance aperture to the exit aperture. A blank is punched from the sheet using a blanking punch having a cross-sectional area less than the extent of the entrance aperture, the blank being punched out by displacing the blanking punch into the entrance aperture. The blank is formed into a shaped article by means of a second punch and die assembly wherein the exit aperture can serve as a blank holder.
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申请公布号 |
US4142396(A) |
申请公布日期 |
1979.03.06 |
申请号 |
US19770852319 |
申请日期 |
1977.11.17 |
申请人 |
ALUMINUM COMPANY OF AMERICA |
发明人 |
DEVENEY, CHARLES H.;KOLAKOWSKI, RONALD L. |
分类号 |
B21D22/20;B21D35/00;(IPC1-7):B21D24/16 |
主分类号 |
B21D22/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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