Pressure control method for compression roller of fixed-width press
By controlling the pressure of the clamping rollers of the fixed-width press in segments, the problem of the tail arching of the slab after side pressing was solved, which improved production stability and roller life, and reduced unplanned downtime and steel jamming during remelting.
Patent Information
- Application Number
- CN202610063331.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-19
- Publication Date
- 2026-03-27
AI Technical Summary
In fixed-width presses, the tail of the slab tends to arch after side pressing, leading to unplanned downtime and unstable production. Existing technologies have failed to effectively solve this problem by increasing the pressure of the pressing rollers, and this also affects the life of the roller surface.
The pressure of the clamping rollers is controlled in segments. The inlet clamping roller is set to 250KN. When the inlet pressure is <80KN and the roller gap is <30mm of the set roller gap, the steel is thrown out. The outlet clamping roller is initially set to 250KN. When the slab pressure measurement is ≥280mm, it is increased to 300KN to ensure stable clamping of the slab.
It effectively reduces the risk of slab tail arching, reduces the occurrence of remelting and steel jamming, improves production stability, and extends the life of the pressing roller surface.
Smart Images
Figure CN121732572A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of hot rolling rough rolling production process, and particularly relates to a pressure control method for a pressure roller of a sizing press. BACKGROUND
[0002] The pressure roller of the sizing press is also called a anti-curling roller, and includes an inlet pressure roller and an outlet pressure roller. The slab is pressed by the pressure roller during the side pressing process in the sizing press, so that the slab is in a relatively stable state during the side pressing process, and the problem of arching in the middle of the slab is reduced. However, in the actual production process, when the slab side pressing amount is greater than 300 mm, the tail of the slab will arch irregularly after the side pressing process of the sizing press, which causes the production line to frequently have unplanned shutdowns and affects normal production operations.
[0003] At present, there is no characteristic value that clearly indicates whether such an abnormality occurs or not for the tail arching of the slab after the side pressing of the sizing press with a large side pressing amount. It is only found that such an abnormality is prone to occur when the slab side pressing amount exceeds 300 mm. Mechanically, the metal on both sides of the slab flows to the middle of the slab after side pressing, so the risk of arching of the slab after side pressing will inevitably increase with the increase of the side pressing amount. Based on this, the pressure of the pressure roller on the slab is simply increased during production to reduce the occurrence of such problems. However, it is found in actual application that simply increasing the pressure of the inlet and outlet pressure rollers of the sizing press does not have a substantial effect on the abnormal arching of the tail of the slab with a large side pressing amount. In addition, from the perspective of protecting the state of the pressure roller surface, maintaining a large pressure of 300 KN or more between the pressure roller and the slab for a long time is not conducive to the state of the pressure roller surface of the sizing press, and will affect the service life of the pressure roller. SUMMARY
[0004] The purpose of the present application is to provide a pressure control method for a pressure roller of a sizing press, which can effectively reduce the risk of arching of the tail of the slab, reduce unnecessary slab re-melting, steel jamming and unplanned downtime, improve production stability, and reduce process cost.
[0005] In order to achieve the above technical purpose, the present application adopts the following technical scheme: a pressure control method for a pressure roller of a sizing press, characterized in that it comprises: (1) Control of the inlet pressure roller: the pressure of the inlet pressure roller is set to 250 KN, and the inlet pressure roller is triggered to throw the steel when the pressure of the inlet pressure roller is less than 80 KN and the actual roll gap size of the inlet pressure roller is less than the set roll gap size minus 30 mm; (2) Control of the exit pinch roll: during operation, the slab gauge is monitored, when the slab gauge < 280mm, the exit pinch roll pressure is set to 200KN throughout the operation; when the slab gauge is greater than or equal to 280mm, the initial pressure of the exit pinch roll is set to 250KN, and during the operation, whether the entry pinch roll is thrown is monitored in real time, when the entry pinch roll is thrown, the pressure of the exit pinch roll is changed to 300KN.
[0006] Further, the set roll gap size is the theoretical thickness of the slab.
[0007] Further, when the pressure of the exit pinch roll < 80KN and the actual roll gap size of the entry pinch roll < set roll gap size-30mm, the exit pinch roll is triggered to throw.
[0008] The beneficial effects of the present application are: by using the method of the present application, when the pressure of the entry pinch roll < 80KN and the actual roll gap size of the entry pinch roll < set roll gap size-30mm, the throw is triggered, which can ensure that the entry pinch roll will not be thrown prematurely when the slab thickness is thinned. For the slab with actual side pressure gauge greater than or equal to 280mm, the exit pinch roll pressure uses a segmented control mode, which can ensure that the slab can be pressed after the entry pinch roll is thrown, and can reduce the arching phenomenon of the slab after being pressed with large side pressure. BRIEF DESCRIPTION OF DRAWINGS
[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0010] Figure 1 It is a top view of a simplified schematic diagram of a width setting press.
[0011] Figure 2 It is a control flow diagram of the entry pinch roll in the method of the present application.
[0012] Figure 3 It is a control flow diagram of the exit pinch roll in the method of the present application.
[0013] In the figure, 1 is an entry pinch roll, 2 is an entry pinch roll, 3 is a width setting press side pressure module on both sides, 4 is an exit pinch roll, 5 is an exit pinch roll, and 6 is a slab. DETAILED DESCRIPTION
[0014] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only intended to explain the present application and not to limit the present application.
[0015] The present application discloses a kind of pressure control method of width setting press pressure roller, specifically including the control of inlet pressure roller and outlet pressure roller.
[0016] (1) the control of inlet pressure roller: inlet pressure roller pressure is set to 250KN, when the pressure of inlet pressure roller <80KN and the actual roll gap size of inlet pressure roller <set roll gap size-30mm, trigger steel throwing.
[0017] (2) the control of outlet pressure roller: when monitoring slab pressure during operation, when slab pressure <280mm, outlet pressure roller pressure is set to 200KN throughout the process; when slab pressure ≥280mm, the initial pressure of outlet pressure roller is set to 250KN, whether inlet pressure roller is thrown during operation is monitored in real time, when inlet pressure roller is thrown, the pressure of outlet pressure roller is changed to 300KN.
[0018] In actual production process, if the control method in prior art is used, when slab thickness exists the phenomenon of thick to thin, the pressure of width setting press inlet pressure roller in constant pressure control with slab is prone to appear the situation of sudden drop due to not contacting slab when slab thickness becomes thin, and this change process will cause slab unable to be pressed by pressure roller, and side pressure is not conducive to keeping slab straight after side pressure in unstable state, when the situation of slab thickness becoming thin is relatively obvious (such as thickness thinning trend of slab in short distance ≥5mm), it is easy to cause the pressure of width setting press inlet pressure roller to drop below threshold value to trigger inlet pressure roller steel throwing in advance, inlet pressure roller will be lifted after triggering steel throwing, and pressure roller is in the state of not contacting slab, which is not conducive to stability control in side pressure process, and the thinning part of slab tail passes through outlet pressure roller, and the problem of pressure roller not pressing slab also exists. And the present application sets the triggering condition of inlet pressure roller steel throwing to pressure <80KN and actual roll gap size of inlet pressure roller <set roll gap size-30mm; two conditions are met at the same time to trigger steel throwing; through this setting, the problem of inlet pressure roller steel throwing in advance due to slab thickness thinning is reduced.
[0019] Further, for the actual side pressure of the slab being greater than 280 mm, the outlet pinch roll pressure is controlled in sections, before the entry pinch roll is thrown, the initial pressure of the outlet pinch roll is set to 250 KN, after the entry pinch roll is thrown, the pressure of the outlet pinch roll is increased by 50 KN based on the setting, i.e. 300 KN. In this way, it can be ensured that the slab can be pressed by the pressure of the outlet pinch roll only after the entry pinch roll is thrown, the risk of the tail of the slab being unable to be pressed due to the thickness being too thin is reduced, and the risk of the slab arching after being pressed by the side pressure is reduced; in addition, the sectional pressure control can also be more beneficial to the protection of the roll surface of the outlet pinch roll compared to the whole process pressure increase.
[0020] Preferably, the throwing condition of the outlet pressure roll is also set, specifically, the outlet pinch roll is thrown when the pressure of the outlet pinch roll is less than 80 KN and the actual roll gap size of the entry pinch roll is less than the set roll gap size-30 mm. The outlet pinch roll will not be thrown too early.
[0021] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.
Claims
1. A method of pressure control of a pressure roller of a constant-width press, characterized in that, Comprise: (1) Control of inlet pinch roll: the pressure of inlet pinch roll is set as 250 KN, and the inlet pinch roll is triggered to throw steel when the pressure of inlet pinch roll is less than 80 KN and the actual roll gap size of inlet pinch roll is less than the set roll gap size-30 mm; (2) Control of outlet pinch roll: the slab pressure is monitored during operation, and the pressure of outlet pinch roll is set as 200 KN when the slab pressure is less than 280 mm; the initial pressure of outlet pinch roll is set as 250 KN when the slab pressure is greater than or equal to 280 mm, and the outlet pinch roll is changed to 300 KN when the inlet pinch roll is thrown.
2. The pressure control method of a width setting press hold-down roll according to claim 1, characterized by, The set roll gap size is the theoretical thickness of slab.
3. The pressure control method of a width setting press hold-down roll according to claim 1 or 2, characterized in that, The outlet pinch roll is triggered to throw steel when the pressure of outlet pinch roll is less than 80 KN and the actual roll gap size of inlet pinch roll is less than the set roll gap size-30 mm.