SU1404135A1 - Method of producing elongated sheet material - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the rolling of long strip sheet material from a strip billet. The goal is to increase the efficiency of the process for estimates of increasing the wear resistance of the rolls. The original blank in the form of a strip with a wedge. cross-section, it is grooved in the stand between the work rolls. By turning one of the rolls, the amount of strip reduction across the width is changed. Initially, lead is carried out in sections of the width of the strip that are at a distance of 0.01-0.02 of its width from the edges of the strip, with a value equal to 0.5-0.7 of the reduction of the middle part of the strip. With further stand operation, this ratio gradually increases to the acceptable wear level of the work rolls. The ability to rotate the rolls and adjust the amount of crimping on individual sections of the strip width allows increasing the time of the rolls to their wear. sfi cl

Description

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The invention relates to the processing of metals by pressure and can be used in the rolling of long-length sheet material from a strip billet.

The purpose of the invention is to increase the efficiency of the process by increasing the wear resistance of the rolls,

The method of rolling a continuous strip involves rolling the original billet in the form of a strip with a wedge-shaped cross section in a cage with work rolls, the axis of at least one of which is tiltable relative to the other to change the amount of strip reduction across the width, being separated from its edges at a distance equal to 0.01–0.02 of its width, initially carried out with a reduction in height equal to 0.5– 0.7 of the reduction in the middle part of the strip, with a gradual increase from Carry on with Further cage operation to an acceptable wear level of the work rolls.

The method is carried out as follows.

New work rolls are made with a working surface that includes a central cylindrical section and two extreme sections, each of which, with a length equal to 0.01–0.02 of the total length of the roll, are made with a smaller diameter compared to the middle part, which ensures a reduction in the degree of compression of the strip in height by 50 - 70% compared with compression in the middle section.

Example. A continuous strip measuring 315x3 mm enters the line of the rolling mill. When rolling to prevent curvature of the strip in the horizontal plane at the exit of the cage, the reduction in width across the strip is performed by turning the upper roll.,.

When the strip is compressed in a rolling stand equal to 5%, the thickness of the strip at the exit of the rolling stand is 2.85 mm. In the sections located from both ends of the strip at a distance of 3.5 mm, about

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The strip is 2.5% thick and its thickness is 2.925 mm.

When rolling a strip with the specified reduction in width reduction, the transverse movement of the strip when adjusting the reduction in width by turning the upper roll decreases significantly and more wear occurs in the roll sections corresponding to a larger reduction value. As the rolls wear out, the difference in the amount of crimping on the edge and the rest of the strip decreases. After alignment of the rollbacks, the further use of the mill rolls can be carried out in two directions: replacement of the work rolls with a new pair, further work on these rolls with the possibility of permissible lateral movement of the strip. Work on this set of rolls may continue as long as the quality indicators of the strip are satisfactory.

The possibility of swiveling the rolls in combination with a variable amount of reduction on certain parts of the strip width makes it possible to increase the efficiency of the process by increasing the operating time of the rolls to an acceptable level of wear.

Claims (1)

Invention Formula A method for producing a lengthy sheet material, comprising rolling the original billet in the form of a strip with a wedge-shaped cross section in cages with work rolls, the axis of at least one of which is set with the possibility of inclination relative to the other to change the amount of strip reduction in width, that, in order to increase the efficiency of the process by increasing the wear resistance of the rolls, rolling on sections of the width of the strip that is 0.01–0.02 times the width of the strip, initially The reduction is achieved with a height reduction of 0.5-0.7 of the reduction amount of the middle part of the strip, with a gradual increase in this ratio during the further operation of the stand to the permissible wear level of the work rolls.