A method of rolling steel

Abstract

This invention provides a steel widening rolling method relating to the field of steel rolling technology, comprising: obtaining an initial width value of the steel; adjusting the roll gap distance between two vertical rolls according to the initial width value and the final required width value of the steel, so that the roll gap distance is less than the initial width value of the steel; centering the steel along the roll gap and feeding it into the roll gap in the length direction, with the two vertical rolls rotating to roll the steel; feeding the steel after being rolled by the two vertical rolls into a horizontal roll for rolling; first feeding the steel into the roll gap between the two vertical rolls for rolling, so that when the steel passes through the roll gap, the vertical rolls on both sides can press the two long sides of the steel inward by the same amount. At this time, the width of the steel pre-pressed by the vertical rolls is reduced by a certain amount of lateral pressure, and this part of the lateral pressure can be offset by the outward bulge of the two long sides that occurs during the subsequent horizontal rolling process, thereby ensuring that the width difference between the head, middle and tail of the steel after widening and rolling is reduced.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and more specifically to a method for rolling steel. Background Technology

[0002] In the existing technology, the dimensional requirements for steel are usually not fixed during use. Therefore, when the original size of the steel does not match the required size, we usually roll the steel. Widening rolling is one of the commonly used methods. However, when we are rolling steel with a high widening ratio, the difference in width before and after rolling is large, and uneven material flow occurs during the rolling process. This results in the two long sides of the rolled steel having an outward convex arc, that is, the width difference between the head, middle and tail is too large, which affects the subsequent shearing efficiency and quality. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that in the prior art, the width difference between the head, middle and tail of the steel is too large during the rolling process of steel with a large width expansion ratio.

[0004] Therefore, the present invention provides a steel rolling method, comprising rolling steel using horizontal rolls, and further comprising:

[0005] Before rolling steel using horizontal rolls, the steel is first fed into the roll gap between two vertical rolls for rolling.

[0006] Before feeding the steel into the vertical rolling mill, the initial width value of the steel is obtained. The roll gap distance between the two vertical rolling mills is adjusted according to the initial width value and the final required width value of the steel, so that the roll gap distance is less than the initial width value of the steel.

[0007] After adjusting the roll gap distance, the steel is centered along the roll gap and fed into the roll gap in the length direction. The two vertical rolls rotate to roll the steel.

[0008] Finally, the steel, after being rolled by two vertical rolls, is fed into horizontal rolls for further rolling.

[0009] Optionally, the roll gap between the two vertical rolls is adjusted according to the widening ratio between the initial width value of the steel and the final required width value of the steel. Specifically, the difference between the initial width value of the steel and the roll gap is set as the lateral pressure Q, the initial width value of the steel is set as X, and the final required width value of the steel is Y, i.e., Q=X / Y*C; C is taken as 8 to 12 mm.

[0010] Optionally, C is 10 mm.

[0011] Optionally, the two vertical rolls respectively press the two long sides of the steel inward along the width direction to roll Q / 2.

[0012] Optionally, after obtaining Q, Q is adjusted according to the Brinell hardness of the steel. When the Brinell hardness value Q is less than 100HB, Q does not need to be adjusted. When the Brinell hardness value of the steel is between 100 and 150HB, Q is reduced by 3 to 4 mm. When the Brinell hardness value of the steel is greater than 150HB, Q is reduced by 6 mm.

[0013] The present invention has the following advantages over the prior art:

[0014] 1. The present invention provides a steel rolling method, comprising: obtaining an initial width value of the steel; adjusting the roll gap distance between two vertical rolls according to the initial width value and the final required width value of the steel, so that the roll gap distance is less than the initial width value of the steel; centering the steel along the roll gap and feeding it into the roll gap in the length direction; rotating the two vertical rolls to roll the steel; feeding the steel after being rolled by the two vertical rolls into a horizontal roll for rolling; and before feeding the steel into the horizontal roll for widening rolling, first... The steel is fed into the gap between two vertical rolls for rolling. The gap between the rolls is smaller than the initial width of the steel. The steel is placed in the center and fed into the gap so that when the steel passes through the gap, the vertical rolls on both sides can press the two long sides of the steel inward by the same amount. At this time, the width of the steel that has been pre-pressed by the vertical rolls is reduced by a certain amount of lateral pressure. This lateral pressure can be offset by the outward bulge of the two long sides that occurs during the subsequent horizontal rolling process, ensuring that the width difference between the head, middle and tail of the steel is reduced after the steel is widened and rolled. Detailed Implementation

[0015] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] Example 1

[0017] This embodiment provides a steel rolling method, including: rolling steel using horizontal rolls; and further including: before rolling the steel using horizontal rolls, feeding the steel into the roll gap between two vertical rolls for rolling; obtaining the initial width value of the steel before feeding it into the vertical rolls; adjusting the roll gap distance between the two vertical rolls according to the initial width value and the final required width value of the steel, so that the roll gap distance is less than the initial width value of the steel; after adjusting the roll gap distance, centering the steel along the roll gap and feeding it into the roll gap in the length direction, with the two vertical rolls rotating to roll the steel; and finally feeding the steel rolled by the two vertical rolls into the horizontal rolls for rolling.

[0018] Before the steel is fed into the horizontal rolls for widening rolling, it is first fed into the roll gap between two vertical rolls for rolling. The distance between the roll gaps is smaller than the initial width of the steel. The steel is placed in the center and fed into the roll gap. When the steel passes through the roll gap, the vertical rolls on both sides can press the two long sides of the steel inward by the same amount. At this time, the width of the steel that has been pre-pressed by the vertical rolls is reduced by a certain amount of lateral pressure. This lateral pressure can be offset by the outward bulge of the two long sides that occurs during the subsequent horizontal rolling process, ensuring that the width difference between the head, middle and tail of the steel is reduced after widening and rolling.

[0019] In this embodiment, the roll gap between the two vertical rolls is adjusted according to the widening ratio between the initial width value of the steel and the final required width value of the steel. Specifically, the difference between the initial width value of the steel and the roll gap is set as the lateral pressure Q, the initial width value of the steel is set as X, and the final required width value of the steel is Y, i.e., Q=X / Y*C; where C is 10 mm; the two vertical rolls respectively press the two long sides of the steel inward along the width direction by Q / 2.

[0020] When adjusting the roll gap, through experiments, the difference between the roll gap and the initial steel width, i.e., the value by which the steel width needs to be rolled inward, is positioned as Q. Q is set as X using the initial width value of the steel, and the final required width value of the steel is Y, i.e., Q=X / Y*C, where C is taken as 10 mm, for calculation. After the calculation is completed, the two vertical rolls respectively roll the two long sides of the steel inward along the width direction by Q / 2 mm, that is, the width of the steel is reduced by Q mm. After the steel is rolled in the above steps, the width difference between the head, middle and tail of the finished product after subsequent horizontal roll widening rolling is significantly reduced.

[0021] In this embodiment, after obtaining Q, Q is adjusted according to the Brinell hardness of the steel. When the Brinell hardness value Q is less than 100HB, no adjustment is needed. When the Brinell hardness value of the steel is between 100 and 150HB, Q is reduced by 3 to 4 mm. When the Brinell hardness value of the steel is greater than 150HB, Q is reduced by 6 mm. As the hardness value of the steel increases, its elasticity decreases, and therefore the amount of initial side pressure required during the widening and rolling process is reduced accordingly. Therefore, Q is reduced accordingly, thereby reducing the impact of the increased hardness value of the steel on the rolling process.

[0022] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for rolling steel, comprising rolling steel using horizontal rolls, characterized in that, Also includes: Before rolling steel using horizontal rolls, the steel is first fed into the roll gap between two vertical rolls for rolling. Before feeding the steel into the vertical rolling mill, the initial width value of the steel is obtained. The roll gap distance between the two vertical rolling mills is adjusted according to the initial width value and the final required width value of the steel, so that the roll gap distance is less than the initial width value of the steel. After adjusting the roll gap distance, the steel is centered along the roll gap and fed into the roll gap in the length direction. The two vertical rolls rotate to roll the steel. Finally, the steel, after being rolled by two vertical rolls, is fed into horizontal rolls for further rolling. The roll gap between the two vertical rolls is adjusted according to the widening ratio between the initial width of the steel and the final required width of the steel. Specifically, the difference between the initial width of the steel and the roll gap is set as the side pressure Q, the initial width of the steel is set as X, and the final required width of the steel is set as Y, i.e., Q = X / Y*C, where C is 8 to 12 mm. After obtaining Q, adjust Q according to the Brinell hardness of the steel. When the Brinell hardness value Q is less than 100HB, no adjustment is needed. When the Brinell hardness value of the steel is between 100 and 150HB, reduce Q by 3 to 4 mm. When the Brinell hardness value of the steel is greater than 150HB, reduce Q by 6 mm.

2. The steel rolling method according to claim 1, characterized in that, C is 10 millimeters.

3. The steel rolling method according to claim 2, characterized in that, Two vertical rolls press the two long sides of the steel inward along the width direction to roll Q / 2.