Piercing die whose punch has different amounts of chamfer at dif

Details Piercing die whose punch has different amounts of chamfer at dif Piercing die whose punch has different amounts of chamfer at dif

1992-04-24

1993-08-17

Yost, Frank T.

Cutting

Processes

Blanking

83685, 83686, 83689, 72333, 72338, B26F 114

Patent

active

052358810

ABSTRACT:
A piercing die including a punch and a die cooperating with each other to effect a piercing operation on a metallic workpiece sheet, the punch having an outer peripheral edge having a closed profile at a working end thereof. The outer peripheral edge of the punch has a first and a second chamfered portion which are formed such that the amount of chamfer of the first chamfered portion is larger than that of the second chamfered portion. The first and second chamfered portions are formed along large-curvature and small-curvature portions of the closed profile of the punch, respectively, and/or along acute and obtuse outer peripheral portions of the punch whose working end face is inclined with respect to the direction perpendicular to the piercing direction. A piercing method using the punch and die is also included.

REFERENCES:
patent: 3320843 (1967-05-01), Schott, Jr.
patent: 4905557 (1990-03-01), Adleman
"Standardizing the Design of Punching Dies"; Machinery; Nov., 1963; pp. 90-93.
Search Report dated Jul. 24, 1992.

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