Method and a device for controlling the dimensions of an elongated material rolled in a rolling mill
AssigneeABB AB
InventorsMats Olsson, Dag Sollander
Life of this patent
Estimating the term…
Abstract
A method and apparatus for controlling the dimensions of an elongated material rolled in a rolling mill comprising at least two mill stands arranged after each other, each of said stands comprising two spaced rolls, said elongated material being fed between the rolls of each stand by rotating the rolls, wherein the material is subjected to stresses in the longitudinal direction thereof during the rolling operation. A rear portion of said material is subjected to an additional tension substantially in the longitudinal direction of the material when a rear end of the material is in the vicinity of a first stand and has not yet passed said stand.
Claims16
A method for controlling the dimensions of an elongated material (10) rolled in a rolling mill comprising at least two mill stands (1, 2) arranged after each other, each of said stands comprising two spaced rolls (4, 5, 6, 7), said elongated material being fed between the rolls of each stand by rotating the rolls, wherein the material is subjected to stresses in the longitudinal direction thereof during the rolling operation, comprising:
- measuring in a first operation the width of a rear portion of a previously fed elongated material through said mill stands at a location downstream of a first stand while said rear portion is subjected to a first tension of a first magnitude;
- and
- subjecting a rear portion (14) of said material (10) to an additional tension with a second magnitude, based on said first tension of a first magnitude and said resulting measured width of said previously fed elongated material, substantially in the longitudinal direction of the material when a rear end (13) of the material is in the vicinity of said first stand (1) and has not passed said stand (1).
A device for controlling the dimensions of an elongated material rolled in a rolling mill comprising:
- at least two mill stands (1, 2) arranged after each other, each of said stands comprising two spaced rolls (4, 5, 6, 7) and means (15, 16) for rotating the rolls in order to feed the material between the rolls of each stand, comprising:
- means (18) between said first stand (1) and second stand (2) for detecting a presence of a rear end of the material upstream of said first stand;
- means (12) for measuring the width of the material (10) between said first (1) stand and second stand (2);
- means for calculating a first magnitude of tension for applying to a subsequently fed material based on at least two measurements of the width of a previously fed material and on a second magnitude of a tension applied to said previously fed material;
- and
- means (17) for controlling operation of the rolls of at least said first stand (1) so that a rear portion (14) of the material (10) is subjected to said first magnitude of tension substantially in the longitudinal direction.
A method for controlling first and second mill stands through which an elongated material passes comprising:
- applying a first magnitude of tension to said elongated material in the longitudinal direction when a rear end of said elongated material is in the vicinity of said first stand and has not yet passed through said first stand;
- determining a resulting width formed on an end portion of an elongated material as it passes through said first mill under said first magnitude of tension;
- and
- controlling the rotation of rolls of each stand through which a subsequent elongated material passes to produce a magnitude of tension on said subsequent elongated material which is based on said resulting width from said first magnitude of tension.
A device for controlling first and second mill stands through which an elongated material passes comprising:
- means for controlling the rotation of rollers in said first and second mill stands to feed said elongated material between stands;
- means for measuring a width of the material between the first and second stands;
- and
- means for calculating a first magnitude of additional tension to be applied to said elongated material based on first and second measurements of width of said material, and on a previously applied magnitude of additional tension applied to said material;
- and
- means for controlling the rotation of rollers to apply said additional tension to a subsequent length of elongated material so that a rear portion of the material is subjected to an additional tension substantially in the longitudinal direction of the material when the rear end of said elongated material is in the vicinity of said first stand and has not yet passed through said first stand.
Dependencies are inferred from the claim text.