Metallic workpiece having punched holes and method for...

Details Metallic workpiece having punched holes and method for... Metallic workpiece having punched holes and method for...

2007-09-10

2010-02-16

Choi, Stephen (Department: 3724)

Cutting

Processes

With reorientation of work between cuts

C083S036000, C083S365000

Reexamination Certificate

active

07661342

ABSTRACT:
An exemplary method for making a metallic workpiece includes: (a) providing a metallic sheet and a punching machine, wherein the metallic sheet comprises a curved portion and a plurality of predetermined punching areas; the punching machine comprises a die set, a lifter, at least one punch blade; (b) placing the metallic sheet on the die set; (c) adjusting a position of the metallic sheet for making a longitudinal center axis of the punch blade perpendicular to a plane tangential to a center of the predetermined punching areas; (d) applying the lifter to press down, and the punch blade punching one of the predetermined punching areas out of the metallic sheet; and (e) repeating steps (c) and (d) appropriately in turn to form a plurality of punched holes in the curved portion of the metallic sheet. The metallic workpiece made by the present method is also provided.

REFERENCES:
patent: 3530748 (1970-09-01), Fuller
patent: 5027683 (1991-07-01), Kakimoto
patent: 5227641 (1993-07-01), Cheng
patent: 5249492 (1993-10-01), Brown et al.
patent: 5555760 (1996-09-01), Kadis
patent: 6874395 (2005-04-01), Ishii et al.
patent: 4-28428 (1992-01-01), None

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