Pressing method and punch and die press for the same
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United States of America Patent
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-
Sep 1, 1987
Grant Date -
N/A
app pub date -
Dec 20, 1984
filing date -
Dec 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of pressing a blank comprises the steps of pressing the blank between a die assembly having a cavity with a highly viscous substance contained therein and a punch, inserting the punch into the cavity to increase a pressure of the highly viscous substance in the cavity, and pressing the blank against a surface of the punch under the pressure of the highly viscous substance. The pressing method can form pressed product of complex shape highly accurately and free from cracks, wrinkles, or other damages. There is also disclosed a punch and die press suitable for effecting the abovesaid pressing method.
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