Method and apparatus for working burred portion of workpiece

Details Method and apparatus for working burred portion of workpiece Method and apparatus for working burred portion of workpiece

1994-01-18

1996-02-20

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

723552, 723546, 72327, 72333, B21D 2200, B21D 2800, B21D 2816

Patent

active

054920019

ABSTRACT:
The periphery of a workpiece which has already been subjected to burring is at least partially punched by a periphery punch and a periphery die. The burred portion is then further pressed by the periphery punch and a die surface including an annular portion which opposes the periphery punch while restricting the lateral movement of the workpiece by the periphery die. An apparatus for working a burred portion is made up of a metallic mold having a periphery die and a periphery punch, a lifter which is disposed inside the periphery die so as to be movable up and down relative to the periphery die, and further working device for further working the burred portion into a shape and dimension of those of a final product of the workpiece. The further working device includes a pilot pin which is projectingly fixed to a lower end of the periphery punch and a knockout which is disposed in a recess in the lifter and which has an annular portion on its upper edge.

REFERENCES:
patent: 175653 (1876-04-01), Bliss
patent: 3513683 (1970-05-01), Moore
patent: 4389871 (1983-06-01), Takeuchi et al.
patent: 4604886 (1986-08-01), McGregor, Jr.
patent: 4611391 (1986-09-01), Franz et al.

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