Drawing punch for drawing foil

Details Drawing punch for drawing foil Drawing punch for drawing foil

Filed on

1984-07-19

Date issued

1986-01-07

Examiner

Gilden, Leon

Patent Class

Metal deforming

SubClass

By use of closed-die and coacting work-forcer

SubSubClass

Cup or shell drawing

Other Related Categories

72348, 72465, B21D 2200

Type

Patent

Status

active

Patent number

045627177

Description

ABSTRACT:
A drawing punch for use in drawing foils in a die which converges in the direction of drawing. The punch has a rigid core, a cylindrical elastic body on the core and surrounding the core with a cavity therein around the core and opening out of the end of the body facing the direction of drawing. A rigid support member is provided on the core against which the other end of the body is supported. The radial cross-sectional area of the cylindrical elastic body increases from the firstmentioned end of the body toward the other end, and the peripheral surface of the cylindrical elastic body is at a positive angle to the axis of the punch of from 0.degree. to 20.degree.. The cavity has a volume which becomes zero just before the end of the stroke of the punch into the die.

REFERENCES:
patent: 3910095 (1975-10-01), Hortig
patent: 4365498 (1982-12-01), Hirota

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