B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
80/25, 80/52
B21B 17/00 (2006.01) B21B 17/14 (2006.01)
Patent
CA 1036395
ABSTRACT OF THE DISCLOSURE The invention relates to a new procedure for the stretch reducing of tubular stock, in a manner to reduce the 80- 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 during working by fewer mill stands than intermediate sections of the tube. 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 ant retarding forces. Within this general pro- cedure, 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 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.
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