Process for manufacturing seamless metal tubes

Details Process for manufacturing seamless metal tubes Process for manufacturing seamless metal tubes

1981-07-09

1983-11-22

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With metal deformation of different type

72100, 72368, B21B 1904

Patent

active

044161344

ABSTRACT:
The present invention relates to the manufacture of seamless metal tubes by a cross-roll helical rolling process such as Mannesmann mandrel mill process or by a press piercing process such as Ugine Sejournet process. Shells being worked are subjected to outside-diameter reduction by means of a rotary mill having 3 or 4 rolls, without using internal tools such as plug and mandrel bar, so that wall eccentricity is significantly improved, which fact assured higher quality of finished product.

REFERENCES:
patent: 347703 (1887-12-01), Ritchie
patent: 1800891 (1931-04-01), Kocks
patent: 3495429 (1970-02-01), Muller

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