Multi-stand mandrel-free stretch reducing mill

Details Multi-stand mandrel-free stretch reducing mill Multi-stand mandrel-free stretch reducing mill

1998-12-16

2000-04-11

Tolan, Ed

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72 89, 72 127, 72224, 72235, B21B 3768

Patent

active

060475781

ABSTRACT:
A roll pass of a roll set having three rolls for a multi-stand mandrel-free stretch reducing mill has a roll pass shape that deviates from the circular. A tube is passed in its longitudinal direction through the non-circular roll pass shape enabling modification of a shape of a cross-section of the tube, so as to counteract the non-circular external diameter deviations of the tube. A final roll pass (finishing pass) of the stretch reducing mill is locally enlarged at peripheral points where the tube diameter of the entering tube would otherwise deviate downward from a target size and locally reduced in size at the peripheral points where the tube diameter would otherwise deviate upward from the target size.

REFERENCES:
patent: 3952570 (1976-04-01), Demny et al.
patent: 4099402 (1978-07-01), Biller
patent: 4275578 (1981-06-01), Steinbrecher et al.
patent: 4311033 (1982-01-01), Demny et al.
patent: 5533370 (1996-07-01), Kuroda et al.
patent: 5816092 (1998-10-01), Pehle et al.

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