Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1978-09-27
1980-10-28
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264292, 425393, 425398, B29D 2300
Patent
active
042306612
ABSTRACT:
An indirect extrusion process making use of an apparatus having a main ram and a container which are adapted to be driven independently of each other, the container being moved during the extrusion at a speed equal to or higher than that of the main ram, so as to produce the extrusion force, characterized in that the movement of the container relative to the main ram is prevented so that the power for moving the container may be added to the extrusion force, so as to effect extrusion without causing change in the relative position between the container and the billet during extrusion, and that the main ram and the container are connected at a desired position in accordance with the length of the billet, making use of the frictional force exerted between the container and said billet, such that extrusion may be effected with respect to container and the billet in connected state of operation.
REFERENCES:
patent: 1528263 (1925-03-01), Peelle
patent: 1606729 (1926-11-01), Boal et al.
patent: 2953816 (1960-07-01), Kidder
patent: 3214505 (1965-10-01), Pierkowski et al.
patent: 3271502 (1966-09-01), Wentorf
patent: 4051505 (1978-03-01), Kawai
"MEtal Forming: Processing and Analysis" by Avitzuv, McGraw Hill Pub., N.Y., pp. 250-255, 1968.
Borg Warner Technical Bulletin "Cold Forming" P.B-138 p. 17, Apr. 1969.
Asari Akira
Nishimoto Takeo
Ueda Masakazu
Kobe Steel Limited
Woo Jay H.
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