Punch and method for forming slugless pierced conical extrusions

Details Punch and method for forming slugless pierced conical extrusions Punch and method for forming slugless pierced conical extrusions

1999-06-24

2000-08-29

Crane, Daniel C.

Metal deforming

With cutting

By composite tool

72325, B21D 2810

Patent

active

061090867

ABSTRACT:
A punch for forming a slugless, pierced conical extrusion in a sheet metal panel. The punch has a cylindrical shank with a hole-forming portion at one end. The hole-forming portion includes a cylindrical extruding portion axially outwardly of the end of the shank and a cylindrical piercing tip axially outwardly of the extruding portion. The piercing tip has an outer end formed with a flat radial surface perpendicular to the central axis of the punch and a flat ramped surface extending at an acute angle to the radial surface. The acute angle is in a range from 40.degree. to 50.degree. preferably 45.degree.. Upon initial axially outward advance of the punch, the piercing tip punches a hole in the sheet metal panel leaving punched-out material attached at an edge of the hole. Upon further axially outward advance of the punch, the extruding portion forms a conical extrusion around the hole. The hole is pierced, coned and extruded in one continuous stroke of the punch.

REFERENCES:
patent: 518766 (1894-04-01), Plecker
patent: 1468271 (1923-09-01), Bechtel
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patent: 2180545 (1939-11-01), Parsons et al.
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patent: 4404835 (1983-09-01), Frith
patent: 4509355 (1985-04-01), Oishi
patent: 4540011 (1985-09-01), Croxford et al.

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