Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1991-07-22
1992-11-10
Larson, Lowell A.
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72 17, 72247, 7386207, 73159, 226179, B21B 3706, G01L 504
Patent
active
051613980
DESCRIPTION:
BRIEF SUMMARY
It is well known to determine the shape of metal strip moving in the direction of its length under tension by passing the strip in contact with part of the periphery of a detector roll which is rotatable about an axis extending at right angles to the direction of movement of the strip. The detector roll determines the tension in the strip at intervals across its width and a variation in tension across the width of the strip indicates that the strip is not of uniform shape across its width.
A well known detector roll, sold under the trade name VIDIMON, comprises a number of rollers arranged side-by-side and rotatable about a common axis. Each roller has detector means associated with it for determining the force applied to the roller by the part of the strip which engages the periphery of the roller. The force is representative of the tension in that part of the strip.
To be able to determine the strip tension at its edges, the two lateral edges of the strip must engage with the detector roll, i.e. the width of the strip must not be greater than the overall length of the roll. However, if the width of the strip is not exactly equal to the length of the roll, or to a multiple of the width of each roller, at least one of the outer rollers of the roll will have strip contacting it along only a portion of its periphery in the direction which is parallel to its axis of rotation. In this event, the detector associated with that roll will not indicate a true value of the force applied to the roll by the strip and a false impression of the shape of the edge of the strip will be given. However, this can be taken into account when determining the force indicated by the detector if the position of the edge of the strip on the roller is known.
For strip of certain widths, the rollers at both ends of the roll may give a false impression of the shape of the edges of the strip.
Furthermore, when rolling metal strip, it is often the case that the edges of the strip ar "tight" whereas, just inboard of each edge, there is a longitudinally extending "loose" region If the edge and the longitudinally extending loose region engage with the same roller of the detector roll, the relatively high force applied to the roller by the tight edge offsets, to some extent, the lower force applied to the roller by the loose region and, consequently, the force indicated by the detector associated with that roller does not give an indication of the shape of either the edge or the loose region of the strip.
It is an object of the present invention to provide a method of, and apparatus for, overcoming these difficulties.
According to a first aspect of the present invention, in a method of determining the shape of metal strip rolled in a rolling mill wherein, on leaving a stand of the mill, the strip has tight edge regions with longitudinally extending loose regions inboard of the edge regions and the strip moving in the direction of its length under tension is passed around part of the periphery of a detector roll having a length greater than the width of the strip, said detector roll comprises a plurality of rollers arranged side-by-side and rotatable about an axis which is normal to the direction of movement of the strip and each roller having a detector associated with it for determining the force applied to the roller by the strip, characterised in that either the path taken by the strip relative to the detector roll is adjusted or the axial position of the detector roll relative to the path taken by the strip is adjusted so that at least one of the lateral edges of the strip takes up a predetermined position with respect to the roll such that the edge region and the loose region inboard thereof engage with different rollers.
With both of these embodiments at at least one edge of the strip the edge and the loose region engage with adjacent rollers.
According to a second aspect of the invention, a detector roll for use in determining the shape of metal strip rolled in a rolling mill comprises a plurality of rollers arranged side-by-side and
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patent: 2766041 (1956-10-01), Teplitz
patent: 3442104 (1969-05-01), Misaka et al.
patent: 3570624 (1971-03-01), O'Connor
patent: 3890834 (1975-06-01), Henze
patent: 4289005 (1981-09-01), Cabaret et al.
patent: 4744235 (1988-05-01), Schiller
patent: 4750343 (1988-06-01), Richter et al.
Gore Trevor A.
Grocock Peter G.
Round Philip F.
Davy McKee (Poole) Limited
Larson Lowell A.
Schoeffler Thomas C.
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