Charles F Wolfe

US Patent:

44737386, Sep 25, 1984

Filed:

Oct 5, 1981

Appl. No.:

6/308300

Inventors:

Charles R. Wolfe - Miamisburg OH
Ivan C. Eltzroth - Franklin OH

Assignee:

Dayton Superior Corporation - Miamisburg OH

International Classification:

B21J 508
B21K 146

US Classification:

219152

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.