Cut-off style, roll thread flat dies

Details Cut-off style, roll thread flat dies Cut-off style, roll thread flat dies

1984-01-27

1986-01-14

Crane, Daniel C.

Metal deforming

Tool and/or tool holder

Tool-comprising die plate having ribs and/or grooves

72 71, 72 88, B21H 306

Patent

active

045638900

ABSTRACT:
A cut-off style, roll thread flat die for use with a matched cut-off style, roll thread flat die to form a threaded, pointed fastener such as a gimlet point screw, the cut-off style, roll thread flat die having a top operating surface comprising body-threads, point threads, a slug traction ramp to provide controlled rotation for the cut-off slug and a slug extrusion taper to provide proper extrusion of the cut-off slug from the fastener, the slug traction ramp and the slug extrusion taper extending in side-by-side relation from a start location, past a transition location to a termination location, the slug traction ramp and the slug extrusion taper having a common edge and thereby being laterally continuous from the start location to the transition location, the slug extrusion taper forming an obtuse angle with the slug traction ramp from the start location to the transition location, the edge of the slug extrusion taper adjacent the slug traction ramp being substantially vertically spaced above the edge of the slug traction ramp adjacent the slug extrusion taper from the transition location to the termination location, the spacing continuously increasing from the transition location to the termination location, the slug extrusion taper having a selected and constant angle of inclination, and the slug traction ramp having a selected and constant orientation.

REFERENCES:
patent: Re26518 (1969-01-01), Mau et al.
patent: 319756 (1885-06-01), Simonds
patent: 352365 (1886-11-01), Simonds
patent: 1961257 (1934-06-01), Thomson
patent: 3789643 (1974-02-01), Dickson
patent: 3889516 (1975-06-01), Yankee et al.

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