RU1784300C - Sheet and plate rolling method - Google Patents

Abstract

Usage: rolling sheets and plates, mainly on reversing mills that do not contain stands with vertical rolls. The inventive rolling at an angle with alternating diagonals of the roll when the task in the rolls is carried out with the formation of a shortage interrupting the rolling process after compressing the side edges closest to the rolls along the entire length, and the deformation is carried out with a constant coefficient of height deformation and the angle of the problem in each pair of passes on the angle is on different diagonals m, and the roll is set into rolls with a narrow end, and each pass at an angle is alternated with a pass in the longitudinal direction with compression to the thickness rolled in the previous pass of the roll A.5 ill.

Description

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The invention relates to rolling production and can be used for rolling sheets and slabs of ingots mainly on reversing mills that do not contain stands with vertical rolls.

A known method of rolling sheets and slabs with intermediate defects, including interrupting the rolling process when receiving a shortage with a length of the rolled part at least equal to the height of the ingot or slab, and then change the orientation of the head and end parts of the shortage relative to the initial direction of rolling , ask the shortage in the rolls with the end part and roll it to the end. In this case, the orientation of the head and end parts of the undersupply on the reversing mill is changed due to the fact that the end part of the undersupply is passed with the rolls apart without compression, and then the rolls are reversed and the initial clearance is established between them. With continuous rolling, the undershot is removed from the rolls and deployed from 180 °.

The closest technical solution in terms of technical nature and the achieved result is a method of rolling sheets and plates, including longitudinal rolling of the ingot and subsequent rolling of the roll to an angle with alternating diagonals of the roll during rolling into rolls and subsequent rolling to the required size.

A disadvantage of the known method is that it does not reduce the loss of metal with side trim, since the initial taper along the width of the ingot becomes the width of the roll.

The purpose of the invention is to reduce the loss of metal to the edge by reducing the taper of the roll in plan.

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ABOUT

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This is achieved by the fact that in the method of rolling sheets and plates, including longitudinal rolling of the ingot, rolling the roll to an angle with alternating diagonals of the roll when setting to rolls and subsequent rolling to the required sizes, rolling to the corner is carried out with the formation of a shortcut by interrupting the rolling process after crimping the near to the rolls of the side edge along the entire length, and the deformation is carried out with a constant coefficient of height deformation and tasks in each pair of passes at an angle of different diagonals, and the roll is set into rolls with a narrow end and each pass at an angle is alternated with a pass in the longitudinal direction with compression of the undershot to thickness), rolled in the previous pass of the roll part.

Figure 1-5 shows the evolution of the form of the roll in plan when rolling by the proposed method.

The essence of the proposed method for producing sheets and slabs from ingots is as follows. After deformation in the longitudinal direction, in order to remove the taper over the thickness of the ingot, it is inserted into the rolls of one of the diagonals from the narrow end side and rolled in one pass at an angle until a shortage is obtained. After crimping the side edge closest to the rolls along the entire length, the rolling process is interrupted. In the next pass, without changing the gap between the rolls, the undershot is set into the rolls with one of the ends, preferably wide, for greater stability of the gripping process, and rolled along the entire length, thus aligning the thickness of the roll. Then, the roll is again set into rolls with a different diagonal from the side a narrow end and rolled at an angle until a second intermediate undershot is obtained. while setting the angle of the task the same as in the previous pass at an angle when receiving the first intermediate shortage, which ensures the formation of the second lateral edge of the roll in a direction parallel to its longitudinal axis.

Thereafter, a longitudinal longitudinal passage along the length of the roll is again performed without changing the roll gap set upon receipt of the second intermediate flaw in the previous passage at an angle, also setting the roll into rolls, preferably with a wide end. If due to the limited power resources of the mill or due to the significant initial taper of the ingot in width, it is impossible to ensure the parallelity of the side edges of the roll for a couple of passes at an angle,

alternating with a pair of longitudinal passages, this cycle is repeated.

After eliminating the taper in this way, the roll is subsequently deformed to the required dimensions, either longitudinally or transversely, with or without breakdown of the width, depending on the ratio of the size of the ingot and the finished product, as well as

taking into account customer requirements.

PRI me R. In the horizontal rolls of the reversing laboratory mill 170, a lead sample was simulated rolling the ingot after removal

taper in its thickness (Fig. 1), in plan view representing an isosceles trapezoid ABCD 70 mm high, 56 mm larger base, 40 mm smaller base. The initial sample thickness was

mm In the first pass at an angle, the sample was set into rolls with a diagonal of BD from the side of the narrow end face CD. The angle of the ADO problem with respect to the axis OOi of the rolls was ai-28 °. Direction of rolling is indicated by an arrow.

Ei. After the first pass, the first intermediate deficiency ABCDi was obtained (Fig. 2) with a triangular thickness in terms of the deformed portion of ACDi (shaded) equal to mm. In this case, the coefficient

high-altitude strain

 , 33, and the lateral edge of the ADi pri

measured parallel to the longitudinal axis MN. In the second, longitudinal passage made

along the entire length, without changing the roll gap, in the E2 direction, a roll (Fig. 3) of the same thickness was obtained, 8 mm (a decrease in thickness by 0.2 mm was due to the influence of the stand spring). Thereafter

reduced the roll gap and in the third pass through the corner - the roll AiBiCiDi was set (Fig. 3) from the side of the narrow end DiCi with the diagonal AiCi in the direction Ез. In this case, the angle of the problem (between the lateral edge

BiCi and OOi roll axis) amounted to

A second intermediate deficiency of AiBiC2Di was obtained (Fig. 4), including close to the triangle in plan

the deformed BiCaDi section is .8 mm thick, and the height-strain coefficient is .33. Compression of this deficiency in the fourth - longitudinal - passage is made along the entire length in the direction E-j (Fig. 4) without changing the roll gap set in the third passage (corner passage) upon receipt of the deficiency. The lateral edges of the resulting roll (Fig. 5) are almost parallel to each other, and the raznoshirinost roll decreased from 16 mm (Fig. 1) to 2 mm (Fig. 5). In this case, the wideness refers only to the end sections of the roll, i.e. has a local character and focuses on the parts of the roll, which are technologically necessary trimming when rolling sheets and slabs from ingots.

The proposed method is recommended for use mainly on reversible crimping and plate mills not equipped with a stand with vertical rolls. If necessary, it can be implemented on non-reversible mills. The method further includes the operation of transferring the roll from the rolling table behind the stand to the rolling table in front of the stand (after each pass). The application of the proposed method will reduce the loss of metal in the edge due to the taper of the ingot in width.

Claims (1)

SUMMARY OF THE INVENTION A method for rolling sheets and plates, including longitudinal rolling of an ingot and subsequent rolling of a roll to an angle c alternating the diagonals of the roll during the task in the rolls and subsequent longitudinal rolling to the required size, characterized in that, in order to reduce the loss of metal to the edge due to the reduction taper of the roll in plan, rolling of the roll at an angle is carried out with the formation of a shortage by interrupting the rolling process after compressing the side edge closest to the rolls along the entire length, and deformation is carried out with a constant coefficient of height deformation and the angle of the problem in each pair of passes at an angle of different diagonals , the roll is set into rolls with a narrow end and each passage at an angle alternate with the passage in the longitudinal direction with compression of the undershot to the thickness of its part, rolled in the previous passage. 8b Fng. 2 I AM B, a Fzhg.Z Fng. 4