Multistroke punching method and apparatus therefor

Details Multistroke punching method and apparatus therefor Multistroke punching method and apparatus therefor

1990-09-17

1994-05-10

Jones, Eugenia

Cutting

Processes

Plural cutting steps

83237, 83529, 83530, 83689, 83916, B23D 2700

Patent

active

RE0346020

ABSTRACT:
To eliminate defects such as burr, rollover, sags, scar, etc. from cut-off surfaces of a workpiece in a turret punch press, for instance, a novel height-different punch formed with a lower front edge, an upper rear edge, and an intermediate edge extending between the two edges is used for the punch press. While feeding the workpiece on a horizontal plane in a predetermined direction, the punch is struck by a striker at a first stroke so that the lower front edge thereof cuts off the workpiece partially in cooperation with a die; at the succeeding strokes so that the intermediate edge thereof cuts off the workpiece mincingly and curls refuse within a recess of the die; and at the last stroke so that the upper rear edge thereof cuts curled refuse away from the workpiece to complete a multistroke punching operation.

REFERENCES:
patent: 2287168 (1942-06-01), Duncan
patent: 3728927 (1973-04-01), Pfleiderer et al.
patent: 3780814 (1973-12-01), Herb
patent: 4007653 (1977-02-01), Cady
patent: 4012975 (1977-03-01), LaLone
patent: 4481847 (1984-11-01), Schneider et al.
patent: 4538493 (1985-09-01), Perazzolo et al.
patent: 4739687 (1988-04-01), Wanner et al.

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