Die for extrusion of multi-hole tube and multi-hole tube made wi

Details Die for extrusion of multi-hole tube and multi-hole tube made wi Die for extrusion of multi-hole tube and multi-hole tube made wi

1993-11-02

1996-10-22

Watkins, William

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 72, 428116, 428131, 428178, 428188, 4283044, 4251311, 425132, 425461, 425462, 425463, 425464, 425465, 425466, 425467, 425 67, 425 71, 425 721, 425DIG217, 425382R, 425381, 425380, F28D 104

Patent

active

055674933

ABSTRACT:
A multi-hole tube extrusion die comprises a female mold die having a flat opening and a mandrel having comb-teeth-like molding portions arranged in the opening. A heated material is extruded between the female mold die opening and the comb-teeth-like molding portions of the mandrel to form a tube having a multi-plicity of holes. An interval between each of the comb-teeth-like molding portions at the opposite ends of the mandrel and the comb-teeth-like molding portion adjacent to the outermost comb-teeth-like molding portion is set to be smaller than an intervals between the female mold die opening and each of the outermost comb-teeth-like molding portions and to be larger than an interval between adjacent ones of the other comb-teeth-like molding portions. Additionally, the outermost comb-teeth-like molding portions are larger in width than the other comb-teeth-like molding portions. Therefore, a lateral pressure difference acting on each of the outermost comb-teeth-like molding portions due to flows of the material is reduced, and the rigidity of outermost comb-teeth-like molding portions is increased, thereby preventing deformation of the die and enabling prolongation of the life of the die as well as a highly accurate extrusion.

REFERENCES:
patent: 2151540 (1939-03-01), Varga
patent: 3905743 (1975-09-01), Bagley
patent: 4313327 (1982-02-01), O'Conner
patent: 4766953 (1988-08-01), Grieb et al.
patent: 4852233 (1989-08-01), Kawase
patent: 4892143 (1990-01-01), Ishii
patent: 5186250 (1993-02-01), Ouchi et al.
patent: 5202547 (1993-04-01), Abe et al.
patent: 5202548 (1993-04-01), Kondo et al.
patent: 5251692 (1993-10-01), Haussmann
patent: 5254840 (1993-10-01), Thompson
patent: 5316997 (1994-05-01), Toyoda et al.
Patent Abstract of Japan, vol. 15, No. 452, (M-1180) Nov. 18, 1991, JP A 03 193 209 Furukawa Electric Co., Ltd.

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