Method of making extrusion die for extruding gears

Details Method of making extrusion die for extruding gears Method of making extrusion die for extruding gears

1985-04-29

1986-04-08

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Die

219 69M, 83 19, 83176, 408 19, B23P 1524, B21C 2508

Patent

active

045804672

ABSTRACT:
An extrusion die for extruding helical gears or the like is formed with an extrusion passage having a predetermined draft by initially forming a blank with a central bore and frusto conical outer side surface coaxial with the bore. The formed blank is then forcibly pressed into a frusto conical bore in a die case. The frusto conical bore in the die case is tapered at an angle less than that of the outer surface of the die blank, thus when seated in the bore, radial compressive forces are applied to the blank which progressively increase in magnitude from the small diameter end of the blank to its large diameter end. While so compressed, helical gear teeth are cut into the wall of the central bore of the blank. Upon removal from the case, the blank metal expands radially to provide the machined central passage with the desired draft.

REFERENCES:
patent: 3768344 (1973-10-01), Feldcamp
patent: 4287749 (1981-09-01), Bachrach et al.

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