A method for reducing centerline deviation of a finish rolling head

Abstract

The application provides a method for reducing center line deviation of a finish rolling head, comprising the following steps: obtaining a skew direction of an intermediate blank head and a width of the intermediate blank; calculating a translation distance of an F1 side guide plate according to the width of the intermediate blank; triggering intermediate blank head tracking according to a hot metal detector signal before a flying shear; calculating a real-time position of the intermediate blank head by integrating a roller speed; triggering an F1 side guide plate translation action when the intermediate blank head runs to a position where a F1 side guide plate horn section connects with a parallel section; and canceling the translation of the F1 side guide plate and restoring the F1 side guide plate to a normal position after a F1 rack steel biting signal is generated. The application solves the problem of large center line deviation of the finish rolling head caused by the skew of the intermediate blank head to one side of the finish rolling machine, and simultaneously solves the problems of single side wave and large wedge shape, improves the strip head camber, improves the flatness and wedge shape qualification rate, and reduces the economic loss caused by the problems.

Description

Technical Field

[0001] This invention relates to the field of metallurgical machinery and rolling technology, and more particularly to a method for reducing the deviation of the center line of the finishing mill head. Background Technology

[0002] In the hot continuous rolling process of strip and plate, the intermediate billet after being rolled by the roughing mill is transported via a tens-of-meters-long intermediate roller conveyor, sequentially entering the flying shear side guide plate, flying shear, descaling, and F1 side guide plate, before finally entering the finishing mill. Over time, uneven wear occurs on the intermediate roller conveyor, causing the intermediate billet to skew during transport. When passing the flying shear side guide plate, it skews in the opposite direction, resulting in a skewed bite into the head of the finishing mill, leading to a significant sickle-shaped bend in the finished product.

[0003] In the prior art, in order to improve this situation, the opening of the flying shear side guide plate and the F1 side guide plate is usually appropriately reduced. However, if the opening of the side guide plate is too small, it is easy to cause a steel jamming accident. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a method to reduce the centerline deviation of the finishing mill head, thereby solving the problem of steel jamming accidents that easily occur in existing technologies. This invention calculates the translation distance of the F1 side guide plate based on the width of the intermediate billet, with the translation direction opposite to the deflection direction of the intermediate billet. When the head of the intermediate billet reaches the position where the flared section and parallel section of the F1 side guide plate connect, the side guide plate begins to translate, moving the head of the intermediate billet towards the center. After the F1 stand bites the steel, it returns to the normal position, thus achieving the purpose of correcting the head deviation.

[0005] The technical means employed in this invention are as follows: A method for reducing the deviation of the centerline of the finishing mill head includes the following steps: Obtain the skew direction of the intermediate billet head and the width of the intermediate billet; Calculate the translation distance of the F1 side guide plate based on the width of the intermediate billet; Before the intermediate billet enters the flying shear side guide plate, the flying shear side guide plate uses the first opening degree; Based on the hot metal detector signal before the flying shear, the intermediate billet head tracking is triggered; the real-time position of the intermediate billet head is calculated by integrating the roller speed. When the head of the intermediate billet reaches the descaling pinch roll, the real-time position of the head of the intermediate billet is corrected by the pinch roll biting signal. When the head of the intermediate billet reaches the position where the trumpet section and the parallel section of the F1 side guide plate connect, the F1 side guide plate is triggered to translate. The translation direction of the F1 side guide plate is opposite to the deflection direction of the head of the intermediate billet, and the F1 side guide plate is translated by the translation distance. Once the F1 frame bites the steel signal, the F1 side guide plate cancels its translation and returns to its normal position; at the same time, the flying shear side guide plate uses the second opening to ensure the centering of subsequent intermediate billets.

[0006] Furthermore, the deflection direction of the intermediate billet includes deflection on the transmission side and deflection on the operation side.

[0007] Furthermore, the F1 side guide plate comprises two parts: an operating side and a transmission side. Before translation, the opening degree of the F1 side guide plate on the operating side and the transmission side is equal, as shown in the following formula: (1) In the formula, Indicates the total aperture. Indicates the opening degree of the transmission side before translation. Indicates the opening degree on the operating side before translation. .

[0008] Furthermore, the formula for calculating the translation distance is as follows: (2) In the formula, Indicates the translation distance. W Indicates the width of the intermediate blank. K Basic translation amount C This is the adjustment coefficient.

[0009] Furthermore, the flying shear side guide plate uses a larger first opening value, i.e., a larger compensation value. The formula for the first opening value is as follows: (3) In the formula, Indicates the first aperture degree. W Indicates the width of the intermediate blank. D This represents the compensation value.

[0010] Furthermore, the real-time position formula for the head of the intermediate billet is as follows: (4) In the formula, This indicates the real-time position of the head of the intermediate billet. t Indicates time, v This indicates the speed of the intermediate billet.

[0011] Furthermore, each side of the F1 side guide plate is divided into a flared section and a parallel section. The formula for the opening degree of the F1 side guide plate after translation is as follows: (5) In the formula, Indicates the opening degree of the transmission side after translation. This indicates the opening degree on the operating side after translation. Indicates the translation distance.

[0012] Furthermore, when the F1 side guide plate cancels its translation and returns to its normal position, Set to zero; the second opening, i.e., the compensation value range, is 10-20mm.

[0013] Compared with the prior art, the present invention has the following advantages: This invention effectively solves the problem of excessive deviation in the centerline of the finished product head due to the intermediate billet being biased towards one side of the rolling mill. It also solves problems such as simultaneous single-sided waviness and excessive wedge shape, improving the camber at the strip head, increasing the straightness and wedge shape qualification rate, and reducing economic losses caused by these issues. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the method of the present invention.

[0016] Figure 2 This is a comparison chart of the centerline data of the finishing mill before and after the application of this invention. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] like Figure 1 As shown, the present invention provides a method for reducing the deviation of the centerline of the finishing mill head, comprising the following steps: S1, obtain the skew direction of the intermediate billet head and the width of the intermediate billet.

[0020] In this step, the deflection direction is the deflection direction before the intermediate billet enters the F1 side guide plate. This direction is fixed and known.

[0021] S2, calculate the translation distance of the F1 side guide plate based on the width of the intermediate billet. The translation direction is opposite to the deflection direction of the intermediate billet.

[0022] In this step, the F1 side guide plate includes an operating side and a transmission side, and the openings on both sides are equal before translation.

[0023] (1) In equation (1), Indicates the total aperture. Indicates the opening degree on the transmission side. Indicates the opening degree on the operating side. .

[0024] In this step, the formula for the translation distance is as follows: (2) In equation (2), W represents the translation distance, K represents the width of the intermediate billet, K represents the basic translation amount (empirical value), and C is the adjustment coefficient (range 1.0~2.0).

[0025] S3, before the intermediate billet enters the flying shear side guide plate, the flying shear side guide plate uses a larger opening.

[0026] S4, based on the HMD (Hot Metal Detector) signal before the flying shear, triggers the intermediate billet head tracking. The real-time position of the intermediate billet head is calculated by integrating the roller speed.

[0027] In this step, the formula for the position of the intermediate billet head is as follows: L= (4) In equation (4), The value represents the position of the intermediate billet head, t represents time, and v represents the speed of the intermediate billet.

[0028] S5, when the head of the intermediate billet reaches the descaling pinch roll, the head tracking is corrected by the pinch roll biting signal, so as to make the head position tracking of the intermediate billet more accurate.

[0029] S6, when the head of the intermediate billet moves to the position where the horn section and the parallel section of the F1 side guide plate connect, the side guide plate is triggered to move horizontally.

[0030] S7, after the F1 frame bite signal is generated, the F1 side guide plate cancels its translation and returns to its normal position. At the same time, the flying shear side guide plate uses a smaller opening to ensure the centering of subsequent intermediate billets.

[0031] Example This embodiment provides a method for reducing the deviation of the centerline of the finishing mill head, including the following steps: S1, obtain the skew direction of the intermediate billet head and the width of the intermediate billet. Taking a hot rolling production line of a certain factory as an example, the width of the intermediate billet is 1250mm.

[0032] like Figure 1 As shown, the intermediate billet enters the F1 side guide plate with its head biased towards the operating side.

[0033] S2, calculate the translation distance of the F1 side guide plate based on the width of the intermediate billet. Calculate the translation distance using the following formula, where K is taken as an empirical value of 10mm and C is taken as 1.6.

[0034]

[0035] get It is 20mm.

[0036] The direction of translation is opposite to the direction of the skew of the intermediate blank, so the F1 side guide plate needs to be translated towards the transmission side.

[0037] S3, before the intermediate billet enters the flying shear side guide plate, the flying shear side guide plate uses a larger opening. Calculate the opening of the flying shear side guide plate according to the following formula, with a compensation value of 50mm.

[0038]

[0039] S4, based on the HMD (Hot Metal Detector) signal before the flying shear, triggers intermediate billet head tracking. The real-time position of the intermediate billet head is calculated by integrating the roller speed. When the head of the intermediate billet reaches the HMD, it is 0mm from the starting point of the head tracking position L. The real-time position L of the head is calculated according to formula (4).

[0040] S5, when the head of the intermediate billet reaches the fine descaling pinch roll, the head tracking is corrected by the pinch roll biting signal.

[0041] The distance between the fine descaling pinch roll and the HMD is 10m. When the pinch roll generates a steel bite signal, the head tracking position L will be corrected once.

[0042] S6, when the head of the intermediate billet moves to the position where the horn section and the parallel section of the F1 side guide plate connect, the side guide plate is triggered to move horizontally.

[0043] The distance between the connection position of the horn section and the parallel section of the F1 side guide plate and the HMD is 11m. When the position of the head of the intermediate billet is 11m, the F1 side guide plate begins to move horizontally, and the openings on both sides are as follows:

[0044]

[0045] S7. When the F1 frame bites steel signal is generated, the F1 side guide plate cancels the translation and returns to the normal position. At the same time, the flying shear side guide plate uses a smaller opening to ensure the centering of the subsequent intermediate billet.

[0046] When F1 bites in Set to zero, restore the original values ​​of GDS and GOS for the opening on both sides of the side guide plate, and use 20mm for the compensation value of the airframe side guide plate.

[0047]

[0048] After the above translation, the strip deviates less. After the strip enters each stand of the finishing mill in sequence, the head deviation of the finishing mill exit centerline is improved, thus completing the control of the head centerline deviation.

[0049] Figure 2 The images show a comparison before and after applying the method of this invention. Before application, the centerline deviation of the head was -52mm, and after application, the centerline deviation of the head was -14mm, indicating a significant improvement in the centerline deviation of the head.

[0050] As can be seen from the above technical solutions, the method for reducing the centerline deviation of the finishing mill head provided by the embodiments of the present invention calculates the translation distance of the F1 side guide plate based on the width of the intermediate billet, and the translation direction is opposite to the deflection direction of the intermediate billet. When the head of the intermediate billet moves to the position where the trumpet section and the parallel section of the F1 side guide plate connect, the side guide plate begins to translate, causing the head of the intermediate billet to move towards the center. After the F1 stand bites the steel, it returns to the normal position, thereby achieving the purpose of correcting the head deviation. The present invention effectively solves the problem of large centerline deviation of the finished product head due to the intermediate billet deviating to one side of the rolling mill, as well as the simultaneous generation of single-sided waves and excessive wedges, improves the camber of the strip head, increases the pass rate of straightness and wedge shape, and reduces the economic losses caused by this reason.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for reducing the deviation of the centerline of the finishing mill head, characterized in that, Includes the following steps: Obtain the skew direction of the intermediate billet head and the width of the intermediate billet; Calculate the translation distance of the F1 side guide plate based on the width of the intermediate billet; The formula for calculating the translation distance is as follows: In the formula, Indicates the translation distance. W Indicates the width of the intermediate blank. K Basic translation amount C This is the adjustment coefficient; Before the intermediate billet enters the flying shear side guide plate, the flying shear side guide plate uses the first opening degree; Based on the hot metal detector signal before the flying shear, the intermediate billet head tracking is triggered; the real-time position of the intermediate billet head is calculated by integrating the roller speed. When the head of the intermediate billet reaches the descaling pinch roll, the real-time position of the head of the intermediate billet is corrected by the pinch roll biting signal. When the head of the intermediate billet reaches the position where the trumpet section and the parallel section of the F1 side guide plate connect, the F1 side guide plate is triggered to translate. The translation direction of the F1 side guide plate is opposite to the deflection direction of the head of the intermediate billet, and the F1 side guide plate is translated by the translation distance. Once the F1 frame bites the steel signal, the F1 side guide plate cancels its translation and returns to its normal position; at the same time, the flying shear side guide plate uses the second opening to ensure the centering of subsequent intermediate billets; The F1 side guide plate consists of two parts: an operating side and a transmission side. Before translation, the openings of the F1 side guide plates on the operating side and the transmission side are equal, as shown in the following formula: In the formula, Indicates the total aperture. Indicates the opening degree of the transmission side before translation. Indicates the opening degree on the operating side before translation. ; Each side of the F1 side guide plate is divided into a flared section and a parallel section. The formula for the opening degree of the F1 side guide plate after translation is as follows: In the formula, Indicates the opening degree of the transmission side after translation. This indicates the opening degree on the operating side after translation. Indicates the translation distance; When the F1 side guide plate cancels its translation and returns to its normal position... Set to zero; the second opening, i.e., the compensation value range, is 10-20mm.

2. The method for reducing the centerline deviation of the finishing mill head according to claim 1, characterized in that, The deflection direction of the intermediate billet includes deflection on the transmission side and deflection on the operation side.

3. The method for reducing the deviation of the centerline of the finishing mill head according to claim 1, characterized in that, The flying shear side guide plate uses a larger first opening value, i.e., a larger compensation value. The formula for the first opening value is as follows: In the formula, Indicates the first aperture degree. W Indicates the width of the intermediate blank. D This represents the compensation value.

4. The method for reducing the centerline deviation of the finishing mill head according to claim 1, characterized in that, The formula for the real-time position of the intermediate billet head is as follows: In the formula, This indicates the real-time position of the head of the intermediate billet. t Indicates time, v This indicates the speed of the intermediate billet.

Images