Control method for preventing head and tail of hot-rolled strip steel from overflowing edges and improving coil shape
By formulating strict wear standards for the side guide plates and optimizing the position and pressure control of the side guide plates during the hot-rolled strip production process, the problem of overflowing edges of the head and tail of the hot-rolled strips is solved, and product quality and production efficiency are significantly improved.
Patent Information
- Application Number
- CN202411650251.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-02-28
AI Technical Summary
During the production process, hot-rolled strip often has problems with the head and tail overflowing edges, resulting in poor coil shape and affecting product quality and customer experience.
By formulating strict wear standards for the side guide plates, adjust the opening degree settings of the side guide plates, optimize the position and pressure control timing of the side guide plates, and increase the set pressure at the tail of the side guide plates to control the head and tail overflow edges during the winding process.
It effectively solves the difficulty of controlling overflow edges in the head and tail, stabilizes product quality, and improves the reliability of production efficiency and finished product quality.
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of hot-rolled strip steel, and in particular relates to a control method for preventing the head and tail of a hot-rolled strip steel from overflowing and improving the coil shape. Background Art
[0002] During the operation of the hot rolling production line, the coil shape quality of the steel coil is extremely important to customers, because the first impression of the steel coil by the customer is often judged by its coil shape. However, the steel coil often has poor coil shape during the production process, among which the overflow edge of the head and tail of the steel coil is a typical bad phenomenon. This defect is mainly caused by the combined effect of multiple factors such as the head and tail deviation of the steel coil during the production process, improper side guide plate control, and unreasonable setting parameters. The main harm caused by this poor coil shape problem is that during the lifting and transportation of the steel coil, the overflowing part of the head and tail is prone to cause varying degrees of damage. In this way, the head and tail parts of the steel coil cannot be used normally by customers, which seriously affects the customer's experience. After discovering these problems, customers often raise quality objections, which not only brings inconvenience to customers, but also brings varying degrees of economic losses to production enterprises. Therefore, in order to ensure the quality of the steel coil and avoid unnecessary trouble and losses to customers and enterprises themselves, it is necessary to strictly control and optimize the key links such as head and tail deviation, side guide plate control, and setting parameters in the production process of the steel coil. Summary of the invention
[0003] In order to solve the technical problems existing in the known technology, the present invention provides a control method for preventing the head and tail overflow edges of hot-rolled strip and improving the coil shape. Aiming at the coil shape quality defects caused by the head and tail overflow edges in the production process of hot-rolled strip, a series of measures are taken mainly by formulating strict standards for the degree of wear of the coiling side guide. Specifically, it includes adjusting the opening setting of the coiling side guide before feeding the steel, optimizing the position and pressure control sequence of the side guide during the coiling process, and increasing the set pressure of the tail of the side guide. These measures effectively solve the difficulty of controlling the head and tail overflow edges, thereby ensuring the stability of product quality.
[0004] The object of the present invention is to provide a control method for preventing the head and tail of hot rolled strip from overflowing and improving the coil shape, comprising:
[0005] Regularly detect the wear depth of the side guide plate lining, and when the wear depth of the side guide plate lining exceeds a first threshold, replace the side guide plate lining;
[0006] Regularly detect the amount of the side guide plate oil cylinder pin shaft frame, and when the amount of the side guide plate oil cylinder pin shaft frame exceeds a second threshold, process the amount of the side guide plate oil cylinder pin shaft frame;
[0007] According to the strip width W and the single-side free space D, the position spacing between the two sides of the side guide plate before coiling the strip is set to W+2D;
[0008] The side guide plate controls a short stroke before the strip enters the steel: when the strip head reaches the preset distance in front of the pinch roller of the No. 1 machine, the opening setting position of the side guide plate is reduced;
[0009] Control the secondary short stroke of the side guide plate after the strip enters the steel: when the pinch roller at the head of the strip bites the steel, the opening degree of the side guide plate operation side is set to reduce the preset size, the opening degree of the transmission side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure; or the opening degree of the transmission side is set to reduce the preset size, the opening degree of the operation side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure. The pressure setting adopts different pressure settings according to different strip thicknesses, and the pressure coefficient range is set;
[0010] Set the side guide plate pressure when the tail of the strip is coiled: when the tail of the strip reaches the preset position of the pinch roller, reset the pressure and set the pressure coefficient range.
[0011] Preferably, the first threshold is 5 mm.
[0012] Preferably, the second threshold is 3 mm.
[0013] Preferably, D=40 mm.
[0014] Preferably, the short stroke before the strip steel is fed into the control side guide plate is specifically: when the strip head tracks and reaches the position 18 meters or 5 meters in front of the pinch roller of the No. 1 machine, the opening setting position of the control side guide plate is reduced by 22 mm.
[0015] Preferably, the secondary short stroke of the side guide plate after the strip is fed into the steel is specifically as follows: after the pinch rollers at the head of the strip bite the steel, the opening setting of the operating side of the side guide plate is reduced by 18 mm, the opening of the transmission side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure; or the opening setting of the transmission side is reduced by 18 mm, the opening of the operating side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure. Different pressure settings are adopted according to different strip thicknesses, and the pressure coefficient setting range is 0.5-1.5.
[0016] Preferably, the setting of the side guide plate pressure when the tail of the strip is coiled is specifically: when the tail of the strip reaches a position of 5 meters from the pinch roller, the pressure is reset, and the pressure coefficient setting range is 0.1 to 2.0.
[0017] The advantages and positive effects of the present invention are:
[0018] The invention sets a detailed standard for the wear degree of the coiling side guide plate and accurately sets the opening degree of the coiling side guide plate before feeding the steel. During the coiling process, the control difficulty of the head and tail overflow edges is successfully solved by finely controlling the position of the side guide plate and the pressure control timing, and increasing the set pressure of the tail of the side guide plate. These improvement measures significantly stabilize the product quality, improve production efficiency and the reliability of finished product quality.
[0019] The present invention is particularly suitable for various conventional specification strip steel process production using hot rolling mills. By optimizing the relevant procedures and carefully adjusting the process parameters, the present invention has a very wide range of applications and good technical radiation capabilities. In addition, the present invention also provides important technical support for the development of hot-rolled product specifications, promoting the technological progress of the entire industry and the improvement of product quality. DETAILED DESCRIPTION
[0020] In order to make the above-mentioned purpose, control system and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0021] In the hot rolling production line, the coiling process plays a vital role. This process involves conveying the strip steel with a certain thickness after being rolled by the finishing mill through the hot output roller, and finally coiling it into a hot rolled steel coil under the action of the coiler. The entire coiling process can be described in detail as follows:
[0022] First, after the strip is rolled by the finishing mill, it is transported to the coiling area through the hot output roller. On the rolling line, there are usually 2 to 3 coilers to ensure production efficiency and quality. In order to ensure that the strip can enter the coiler accurately, a special coiling side guide is set in front of the coiler's pinch roller. Specifically, the side guide in front of the No. 1 coiler is designed with a horn section and a parallel section, while the side guide in front of the No. 2 or No. 3 coiler has only a parallel section. The main function of these side guides is to guide and center the strip to ensure that the strip can be smoothly fed into the coiler along the rolling center line.
[0023] In order to prevent the strip from being unhooked and piled up on the hot output roller, before the head of the strip enters the coiler, the speed of the hot output roller, the coiler pinch roller, the auxiliary coiling roller and the reel are all set faster than the rolling speed of the last stand. This ensures that the strip will not be unhooked on the hot output roller, thus avoiding the risk of piled up steel.
[0024] In order to further prevent the strip from running off during the coiling process and thus hitting the side guide plate and causing steel piling, the side guide plate of the coiler will be set to have a larger opening than the strip width before the strip head arrives. As the position of the strip head changes, the side guide plate will make corresponding position and pressure adjustments to ensure that the strip can pass smoothly. When the strip passes the side guide plate and reaches the pinch roller, the strip will be rolled into a steel coil around the mandrel under the action of the auxiliary coiling roller.
[0025] After the strip is threaded, the hot run-out roller, pinch roller, coiling roller and reel will continue to rotate at the same speed as the finishing mill until the tail of the strip completely enters the coiler and stops. This series of precise operations and controls ensures the quality and production efficiency of the hot rolled steel coil.
[0026] The technical solution of the present invention is:
[0027] A control method for preventing the head and tail of hot rolled strip from overflowing and improving the coil shape, comprising:
[0028] In terms of the wear control of the side guide of the coiler, this embodiment sets a clear standard: the wear depth of the side guide lining shall not exceed 5 mm. Once the wear depth exceeds this standard, immediate action must be taken to replace the side guide lining to ensure the normal operation and production efficiency of the equipment.
[0029] In addition, this embodiment also sets a strict standard for the frame accuracy of the side guide plate oil cylinder pin. Specifically, the frame accuracy of the side guide plate oil cylinder pin must be controlled within 3 mm. If the frame accuracy is detected to be beyond this range, this embodiment must be processed in time to ensure the control accuracy of the equipment, thereby ensuring the stability of the production process and the reliability of product quality.
[0030] In terms of position control of the coiling side guide before coiling, this embodiment sets a clear parameter. Specifically, before coiling and feeding, both sides of the side guide must be in a position control state. The position parameter set in this embodiment is the strip width W plus 80 mm (40 mm on one side). This setting ensures the precise position of the side guide during the coiling process, thereby ensuring the correct coiling of the strip.
[0031] For the short stroke control of the side guide plate before the strip enters the steel, this embodiment sets different control parameters according to different types of coilers. For coiler No. 1, since its side guide plate has a trumpet section, this embodiment sets the strip head to track and reach a position 18 meters before the pinch roller. For coilers No. 2 or No. 3, since its side guide plate has only a parallel section, this embodiment sets the strip head to reach a position 5 meters before the pinch roller. At these positions, the setting position of the side guide plate opening degree needs to be reduced by 22 mm to achieve precise position control.
[0032] In terms of the secondary short-stroke control after the side guide strip enters the steel, this embodiment sets a clear operating process. Specifically, after the pinch rollers at the head of the strip bite the steel, the opening setting of the operating side of the side guide needs to be reduced by 18 mm, and the opening on the transmission side also needs to be reduced accordingly. At the same time, this embodiment needs to start the pressure control to squeeze the edge of the strip according to the set pressure. Alternatively, the opening setting on the transmission side is reduced by 18 mm, the opening on the operating side is reduced, and the pressure control is also started to squeeze the edge of the strip according to the set pressure. The pressure setting needs to be adjusted according to the thickness of the different strips, and the setting range of the pressure coefficient is 0.5 to 1.5.
[0033] In terms of setting the side guide plate pressure when the tail of the strip is coiled, this embodiment sets a dynamic adjustment mechanism. Specifically, when the tail of the strip reaches a position of 5 meters from the pinch roller, this embodiment needs to reset the pressure. The setting range of the pressure coefficient is 0.1 to 2.0. This setting ensures that the pressure of the side guide plate can adapt to different situations during the coiling process of the tail of the strip, thereby ensuring the correct coiling of the tail of the strip.
[0034] Finally, this embodiment mentions that the side guide of the coiler is divided into two sides, the operating side and the transmission side. In the primary short stroke control, both sides are position controlled. In the secondary short stroke control, the pressure and position control of the operating side and the transmission side can be selected through the operation screen. It should be noted that one side must be pressure controlled and the other side must be position controlled. This ensures accurate control of the side guide during the coiling process.
[0035] The pressure setting of the tail side guide plate needs to be adjusted according to the actual coiling condition of the tail of the strip. This embodiment sets an adjustment range of the pressure setting coefficient to adapt to different coiling conditions of the tail of the strip, thereby ensuring the correct coiling of the tail of the strip.
[0036] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims
1. A control method for preventing the head and tail of hot-rolled strip from overflowing and improving the coil shape, characterized in that: include: Regularly detect the wear depth of the side guide plate lining, and when the wear depth of the side guide plate lining exceeds a first threshold, replace the side guide plate lining; Regularly detect the amount of the side guide plate oil cylinder pin shaft frame, and when the amount of the side guide plate oil cylinder pin shaft frame exceeds a second threshold, process the amount of the side guide plate oil cylinder pin shaft frame; According to the strip width W and the single-side free space D, the position spacing between the two sides of the side guide plate before coiling the strip is set to W+2D; The side guide plate controls a short stroke before the strip enters the steel: when the strip head reaches the preset distance in front of the pinch roller of the No. 1 machine, the opening setting position of the side guide plate is reduced; Control the secondary short stroke of the side guide plate after the strip enters the steel: when the pinch roller at the head of the strip bites the steel, the opening degree of the side guide plate operation side is set to reduce the preset size, the opening degree of the transmission side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure; or the opening degree of the transmission side is set to reduce the preset size, the opening degree of the operation side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure. The pressure setting adopts different pressure settings according to different strip thicknesses, and the pressure coefficient range is set; Set the side guide plate pressure when the tail of the strip is coiled: when the tail of the strip reaches the preset position of the pinch roller, reset the pressure and set the pressure coefficient range.
2. The control method for preventing the hot-rolled strip from overflowing from the head and tail and improving the coil shape according to claim 1 is characterized in that: The first threshold is 5 mm.
3. The control method for preventing the hot-rolled strip from overflowing from the head and tail and improving the coil shape according to claim 1 is characterized in that: The second threshold is 3 mm.
4. The control method for preventing the hot-rolled strip from overflowing at the head and tail and improving the coil shape according to claim 1 is characterized in that: D=40mm.
5. The control method for preventing the hot-rolled strip from overflowing at the head and tail and improving the coil shape according to claim 1 is characterized in that: The control side guide plate controls the short stroke before the strip enters the steel body: when the strip head reaches the position 18 meters or 5 meters in front of the pinch roller of the No. 1 machine, the opening setting position of the control side guide plate is reduced by 22 mm.
6. The control method for preventing the hot-rolled strip from overflowing from the head and tail and improving the coil shape according to claim 1 is characterized in that: The control of the secondary short stroke of the side guide plate after the strip feeds the steel is specifically as follows: after the pinch rollers at the head of the strip bite the steel, the opening setting of the operating side of the side guide plate is reduced by 18 mm, the opening of the transmission side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure; or the opening setting of the transmission side is reduced by 18 mm, the opening of the operating side is reduced, the pressure control is started, and the edge of the strip is squeezed according to the set pressure. Different pressure settings are adopted according to different strip thicknesses, and the pressure coefficient setting range is 0.5 to 1.
5.
7. The control method for preventing the hot-rolled strip from overflowing from the head and tail and improving the coil shape according to claim 1 is characterized in that: The setting of the side guide plate pressure when the tail of the strip is coiled is specifically as follows: when the tail of the strip reaches a position of 5 meters from the pinch roller, the pressure is reset, and the pressure coefficient setting range is 0.1 to 2.0.