Metal deforming – By use of closed-die and coacting work-forcer
Patent
1988-12-20
1990-05-15
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
72264, 2989334, B21K 0130
Patent
active
049246909
ABSTRACT:
The present invention is to extrude helical internal gears and helical gears by pushing materials processed to any type of blank into a die unit successively by use of a punch, i.e., by passing the materials once through the die unit. The invention is directed to a die unit comprising an outer contour restraining container into which metal material blanks each having a central bore are to be inserted, a die placed contiguously below the container, these container and die being arranged to be circumferentially rotatable relative to each other, and upper and lower mandrels disposed inside the container and the die in alignment with their axes, respectively, and interconnected for being circumferentially rotatable relative to each other, the metal materials being successively pushed into gaps between the upper mandrel and the container and between the lower mandrel and the die by means of a punch to mold helical internal gears.
REFERENCES:
patent: 3564894 (1971-02-01), Sharon
patent: 4509353 (1985-04-01), Ike et al.
patent: 4739644 (1988-04-01), Maki et al.
patent: 4785648 (1988-11-01), Budrean et al.
Aoyama Susumu
Asahi Naotatsu
Hirai Yoshiki
Kanamaru Hisanobu
Koike Tsutomu
Hitachi Powdered Metals Co. Ltd.
Larson Lowell A.
M. H. Center Limited
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