Process for forming articles by heading

Details Process for forming articles by heading Process for forming articles by heading

1984-09-21

1986-07-01

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

Clamp structure constitutes sole initial metal-deforming...

72356, 72354, B21C 3704, B21D 700

Patent

active

045972818

ABSTRACT:
A process for heading of a blank (30) formed from a length of wire stock to form a brush contact (10) having a different diameter ends, (12,14) and an intermediate shoulder (16) with a relatively great reduction in the length of the blank (30) occurring during successive heading steps, including clamping the blank in one of a plurality of holders (166), each having a counter bore (46) opening onto an end face against which a respective one of a series of coning dies (32,50,56,64) are brought into abutment. Each coning die is formed with an opening (38,50,58,66) of successively larger diameters receiving a protruding end of the blank. Respective punches (40,52,60,68) are axially advanced in a respective coning die against the blank and during forming of the blanks, simultaneously forcing the blank material against the interior of the coning die opening and outward into the counterbore. A final forming step involves a reverse extrusion by a smaller diameter punch (86) forced into the blank end to create an endwise axial opening (26) chamfered by a shoulder (84) formed on the punch (86). After the forming motion is complete, the punches are partially withdrawn a slight distance to relieve forming pressure, and the coning dies then withdrawn completely. Thereafter, the punches are completely withdrawn, to prevent slight changes in size upon withdrawal of the coning dies.

REFERENCES:
patent: 1464755 (1923-08-01), Ditson et al.
patent: 2265428 (1941-12-01), Hogue
patent: 2586336 (1952-02-01), Huck
patent: 2705333 (1955-04-01), Friedman
patent: 3247533 (1966-04-01), Phipard, Jr.
patent: 3253287 (1966-05-01), Friedman
patent: 3283556 (1966-11-01), Putetti et al.
patent: 3301033 (1967-01-01), Bignell et al.
patent: 3310822 (1967-03-01), McClellan et al.
patent: 3611462 (1971-10-01), Prutton
patent: 4423617 (1984-01-01), Nippert

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