Method and apparatus for hot forming a polygonal head on a snap

Details Method and apparatus for hot forming a polygonal head on a snap Method and apparatus for hot forming a polygonal head on a snap

1981-10-05

1984-09-25

Envall, Jr., Roy N.

Electric heating

Metal heating

With forging or shaping

10 27H, 219151, B21J 508, B21K 146

Patent

active

044737386

ABSTRACT:
An apparatus for hot forming a polygonal head on an end of a tie rod includes a split electrode for gripping a tie rod and a reciprocating electrode for deforming the tie rod end. One of the electrodes defines a die cavity having walls forming a polygonal contour and a depth greater than a predetermined thickness of the tie rod head to be formed, and the other electrode includes a boss positioned in registry with the die cavity such that the boss may enter the cavity upon movement of the reciprocating electrode into abutment with the split electrode, thereby forcing the heated end of a tie rod into the polygonal contour of the cavity. The preferred method includes intermediate steps of lightly gripping the rod by the split electrodes and lightly contacting the rod tip by the reciprocating electrode to locate the rod accurately with respect to the die cavity.

REFERENCES:
patent: 1420970 (1922-06-01), Cornell, Jr.
patent: 3021421 (1962-02-01), Orgill
patent: 3783462 (1974-01-01), Steffan

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