Rolling mill for the stretch-reducing of tubes

Details Rolling mill for the stretch-reducing of tubes Rolling mill for the stretch-reducing of tubes

1981-06-22

1984-02-14

Husar, Francis S.

Metal deforming

By use of roller or roller-like tool-element

Including tautening of work during deformation

72249, 72367, B21B 3908

Patent

active

044308752

ABSTRACT:
In a method of rolling tubes in a stretch-reducing rolling mill having a group drive in which the elongation, and therefore the tension is increased by increasing the speed of an auxiliary drive motor relative to that of a main drive motor, the length of the trailing "thickened end", which must be rejected as scrap, is reduced by increasing the elongation from the point in time at which the start of the trailing end portion of the tube reaches the last stand. This trailing end portion is that portion which receives a larger wall thickness than the central portion of the tube as a result of the reduced tension exerted in the trailing end portion of prior art practices. The start of this trailing end portion can be predicted from experience or by rolling a sample tube without subjecting its trailing end portion to the said increased elongation and measuring the wall thickness at the trailing end portion of the sample tube.

REFERENCES:
patent: 3645121 (1972-02-01), Pfeiffer et al.
patent: 4020667 (1977-05-01), Demny et al.
patent: 4306440 (1981-12-01), Demny

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