Metal deforming – By use of roller or roller-like tool-element – Including tautening of work during deformation
Patent
1975-12-19
1977-01-11
Mehr, Milton S.
Metal deforming
By use of roller or roller-like tool-element
Including tautening of work during deformation
72234, 72377, B21B 1700
Patent
active
040020487
ABSTRACT:
The disclosure relates to a new procedure for the stretch reducing of tubular stock, in a manner to reduce the so-called crop end loss off of specification product at the ends of a tube section. In the process of the invention, a multi-stand stretch reducing mill is provided with a plurality of speed variable mill stands, at least at the upstream or entry end of the multi-stand mill. As the head end of a finite tubing section enters the upstream end of the mill, and as the tail or trailing end of the finite section enters the mill, programmed speed variations are made in the selected mill stands, to compensate for the fact that the head end or tail end sections of a finite length of pipe are acted upon at any given instant by fewer mill stands than intermediate sections of the tube.
In the process of the invention, selected mill stands are speed controlled such that certain ones thereof apply maximum pulling force to the tube end section, while certain other mill stands apply maximum retarding force. At one or more intermediate mill stand locations, mill stand speed is controlled to establish a substantial equilibrium of such pulling and retarding forces. within this general procedure, a limiting condition at all times is that a predetermined stretch factor, for a given workpiece, is not exceeded at any mill stand. Realization of desired wall thickness, without either maximum force effectiveness or maximum stretch factor, can also be a limiting condition, particularly when rolling the tail end section. The procedure of the invention may require the selected upstream mill stands to be either speeded up, or slowed down, or sometimes both speeded up and slowed down at different moments, in relation to steady-state speed.
REFERENCES:
patent: 3645121 (1972-02-01), Pfeiffer et al.
patent: 3919872 (1975-11-01), Demny et al.
Aetna-Standard Engineering Company
Mehr Milton S.
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