Formed material manufacturing method
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United States of America Patent
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Feb 27, 2018
Grant Date -
May 26, 2016
app pub date -
Nov 7, 2014
filing date -
May 19, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A formed material having a tubular body and a flange formed at an end of the body is manufactured by multistage drawing of a blank metal sheet. The multistage drawing includes preliminary drawing in which a preliminary body having a body preform is formed from the blank metal sheet, and at least one compression drawing which is performed after the preliminary drawing and in which the body is formed by drawing the body preform while applying a compressive force to the body preform. The at least one compression drawing is performed so as to be completed before the pad portion of pressurization means reaches bottom dead center, and a support force supporting the pad portion acts as the compressive force upon the body preform when the body preform is drawn.
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