Prevention of slug pulling in stamping presses

Details Prevention of slug pulling in stamping presses Prevention of slug pulling in stamping presses

1991-05-22

1992-08-11

Watts, Douglas D.

Cutting

With product handling means

Including means to form or hold pile of product pieces

83149, 83164, 83685, 83690, B26F 114

Patent

active

051369079

ABSTRACT:
Stamping die for use with a punch to produce holes in strip material with the resulting production of a slug has a camming rib in the die opening. The rib prevents slug pulling when the punch returns from its extended position to its retracted position. The camming rib causes the slug to become wedged in the die opening and is effective to move the slug laterally in its own plane across the leading edge of the punch thereby overcoming any surface tension or other forces which might cause the slug to adhere to the face of the punch. The camming rib can be straight and extend parallel to the axis of the die opening if the die opening is not tapered. If the die opening has a slight taper, the camming rib is inclined thereby to cause movement of the slug across the face of the punch as the punch moves into the die opening.

REFERENCES:
patent: 2431567 (1947-11-01), Kopczynski et al.
patent: 4489871 (1984-12-01), Bakermans et al.
patent: 4516450 (1985-05-01), Shuttleworth
patent: 4543865 (1985-10-01), Kramski
patent: 4819476 (1989-04-01), Bakermans et al.
patent: 4974479 (1990-12-01), Bakermans et al.
patent: 4995289 (1991-02-01), Bakermans
Oberg Manufacturing Co., Inc. Bulletin 1074.

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