Mandrel rod for pipe rolling mills

Details Mandrel rod for pipe rolling mills Mandrel rod for pipe rolling mills

1989-08-22

1990-09-18

Combs, E. Michael

Metal deforming

By use of roller or roller-like tool-element

With tool inside hollow work

72 97, 72201, B21B 2500, B21B 2504

Patent

active

049569880

ABSTRACT:
Mandrel rod (1) for pipe rolling mills, in which hollow billet (5) is rolled on mandrel rod (1), consists of two pipes (2, 3) lying inside one another. Annular gap (4) between pipes (2, 3) is filled with a thermosetting plastic, whose coefficient of expansion is selected large enough so that the thermosetting plastic completely fills annular gap (4), even with temperature differences, between pipes (2, 3).

REFERENCES:
patent: 1989507 (1935-01-01), Diescher
patent: 3577754 (1971-05-01), Calmes
patent: 3918284 (1975-11-01), Reiley et al.
patent: 4819471 (1989-04-01), Cook

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