Extrusion process and tool for the production of a blank having

Details Extrusion process and tool for the production of a blank having Extrusion process and tool for the production of a blank having

1990-12-03

1992-05-26

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Longitudinal or transverse tubular cavity or cell

72260, 761081, 761086, 419 67, 428596, 75228, G32G 320

Patent

active

051166593

ABSTRACT:
The invention relates to an extrusion process and an extrusion tool for the production of cylindrical metallic or ceramic blanks having one or more internal twisted longitudinal bores. A plasticized, pulverulent starting material, deformable by means of extrusion, is forced through a space formed by a die and a mandrel. One or more twisted central pins of a rigid material are fastened to the mandrel which ends before the inner space of the die. The central pins form the longitudinal bores in the blank. The positioning of the longitudinal bores is extremely symmetrical within the blank and uniformly achieved in the various individual blanks extruded using the same production batch.

REFERENCES:
patent: 2422994 (1947-06-01), Taylor
patent: 4183823 (1989-03-01), Bieneck
patent: 4583888 (1986-04-01), Mori et al.
patent: 4698205 (1987-10-01), Oskarsson et al.
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patent: 4779440 (1988-10-01), Cleve et al.
patent: 4831859 (1989-05-01), Cleve et al.
patent: 4881431 (1989-11-01), Bieneck
patent: 4955764 (1990-09-01), Reinauer
Patent Abstracts of Japan, vol. 13, No. 418 (M-871) [3766] Sep. 18, 1989.
Patent Abstracts of Japan, vol. 13, No. 305 (M-849) [3653 ] Jul. 13, 1989.
Patent Abstracts of Japan, vol. 14, No. 186 (M-962) [4129] Apr. 16, 1990.
English Abstract of DE 3636798A.

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