Blank feeding method

Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece

Reexamination Certificate

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Details

C029S417000

Reexamination Certificate

active

06981303

ABSTRACT:
A method of feeding a blank (31) by cutting a billet (11) for plastic working includes the steps of superimposing a plurality of annular members (15to18) having a coefficient of linear expansion smaller than that of the billet and an inside diameter slightly greater than the outside diameter of the billet on one another to assemble a tubular jig (12), inserting the billet into the assembled jig, heating the billet and the jig to a temperature at which the billet is half-molten, and cutting the billet into at least one blank by moving the annular members adjacent to one another in opposite directions. The cutting of the billet does not need a cutting tool, thus causing no wear of blades, and thereby allowing reduction in production cost. The billet can be cut into a plurality of pieces at a time, increasing productivity. Since the blanks can be fed together with the annular members, there is no need to reheat the blanks, providing increased productivity.

REFERENCES:
patent: 5001918 (1991-03-01), Stepanenko et al.
patent: HEI-5-78360 (1993-10-01), None
patent: 3088845 (1993-12-01), None
patent: 6-198413 (1994-07-01), None
patent: 9-192922 (1997-07-01), None
patent: 10-180428 (1998-07-01), None
patent: 10-261736 (1998-09-01), None
patent: 11-123502 (1999-05-01), None
patent: 2001-321871 (2001-11-01), None

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