Metallic workpiece having to-be-ironed section and method for fo

Details Metallic workpiece having to-be-ironed section and method for fo Metallic workpiece having to-be-ironed section and method for fo

1997-02-25

1998-03-31

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

723912, B21D 2200, B21D 2221

Patent

active

057325871

ABSTRACT:
A metallic workpiece has a to-be-ironed section to be shaped by means of a punch member. The to-be-ironed section is ironed by moving the punch member in a first direction with a side face of the punch member pressed against the surface of the to-be-ironed section and then moving the punch member in a second direction opposite to the first direction. The to-be-ironed section has a front end situated on the front side with respect to the moving direction of the punch member when the punch member moves in the second direction. Before the workpiece is ironed, a gentle slope for preventing burrs, continuous with the front end of the to-be-ironed section, and a bevel portion are formed on the workpiece. A tilt angle between the gentle slope and a line extending along the surface of the to-be-ironed section is at about 30.degree.. The angle of the bevel portion is at 45.degree. or thereabout. Secured between the gentle slope and the side face of the punch member is a gap, which absorbs a distortion of the metallic structure of the surface portion of the to-be-ironed section formed on the side of the front end thereof as the punch member moves in the second direction.

REFERENCES:
patent: 3733880 (1973-05-01), Hansson

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