Method for manufacture of seamless metal tubing by continuous ro

Details Method for manufacture of seamless metal tubing by continuous ro Method for manufacture of seamless metal tubing by continuous ro

1981-05-18

1982-10-12

Combs, Ervin M.

Metal deforming

By use of roller or roller-like tool-element

With tool inside hollow work

B21B 1710

Patent

active

043532381

ABSTRACT:
A method for hot rolling of a tubular blank over a mandrel in a mill utilizing a plurality of roll stands. The blank and mandrel are inserted into the mill and moved through the mill in a fashion such that the mandrel is present and controlled at each roll stand at the time that the blank leading end reaches each roll stand. The blank enters the mill inlet stand at a speed, V.sub.e, and the speed of the mandrel is controlled during all times that the blank is engaged at any roll stand. The control mechanisms achieve movement of the mandrel in the same direction as the blank and at a constant speed, V.sub.m, with the ratio V.sub.m /V.sub.e being maintained between about 0.75 and 1.3.

REFERENCES:
patent: 970263 (1910-09-01), Peters
patent: 981281 (1911-01-01), Kalle
patent: 3857267 (1974-12-01), Lemaire et al.

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