A control method for improving coiling quality and promoting automation of a coiler side guide plate

Abstract

The present application relates to a kind of control methods of coiler hot rolling, more particularly to a kind of control method for improving coiler side guide plate winding quality and promoting automation, when strip head enters side guide plate, side guide plate is closed to the opening degree of head first short stroke setting;When strip head enters pinch roll, side guide plate is closed to the opening degree of head second short stroke setting;After core shaft is built, side guide plate is closed to the opening degree of head third short stroke setting, and position control is converted into pressure control;When strip tail is from pinch roll front X1, side guide plate is opened to tail first short stroke;When strip tail is from pinch roll front X2, side guide plate is opened to tail second short stroke, until winding is completed, the present application relates to a kind of control method for improving coiler side guide plate winding quality and promoting automation, solve the problem of winding shape quality defect caused by traditional side guide plate pressure control process and the problem of manual intervention when side guide plate position control process.

Description

TECHNICAL FIELD

[0001] The application relates to a control method for a coiler hot rolling machine, in particular to a control method for improving the coiler side guide plate coiling quality and improving automation. BACKGROUND

[0002] With the improvement of industrial technology, the function of the coiler is to coil the finished product after rolling into a coil to meet the needs of production, transportation, storage and users. The coiler has a large tension to ensure the reduction of rolling pressure and reduce the warping phenomenon of the strip steel, thereby improving the quality of the strip steel product. The coiler generally consists of core equipment coiler, auxiliary coiling equipment coiling roller, etc. In the product coiling process, the product is mainly formed on the coiler, which is generally driven by a motor. The auxiliary coiling equipment coiling roller is generally driven by a motor to rotate, and a fluid hydraulic cylinder drives the coiling roller to move to help the coil to be formed smoothly.

[0003] At present, in the coiling process of the coiler, in order to ensure that the head of the strip steel is smoothly introduced into the pinch roll, and at the same time, the control of the coil shape is considered, the head of the side guide plate generally adopts 2-3 stage head short stroke action. After the head short stroke is finished, the control method of the side guide plate is generally two kinds, one is position control, and the other is pressure control. For position control, the opening degree of the side guide plate is set to be slightly larger than the width of the strip steel, and the actual extrusion force of the strip steel on the side guide plate is not considered in the control process, and the opening degree is always kept unchanged. For pressure control, according to the given set pressure, the side guide plate is always controlled to maintain the target pressure. In combination with the quality control condition, in the actual production process, the side guide plate for the strip steel with a thickness of 2.5 mm or more is generally controlled by pressure to prevent the occurrence of overflow coil layer displacement defects. The side guide plate for the strip steel with a thickness of less than 2.5 mm is controlled by position to prevent the side guide plate from extruding the edge of the strip steel to cause edge damage.

[0004] But for part of high strength steel, high temperature soft steel, if the side guide plate adopts pressure control, due to the serious high strength steel wave, high temperature soft steel is prone to edge damage, and the defect of layer displacement, in order to improve such quality problems, check the literature, there are two kinds of control methods to improve such problems, the first kind is that after the end of the short stroke of the side guide plate head, the side guide plate adopts pressure control for a period of time and then opens a certain amount to carry out position control, and executes the tail short stroke control when the tail; The second kind is that after the end of the short stroke of the side guide plate head, the side guide plate adopts pressure control for a period of time and then opens a certain amount to carry out position control, and closes the side guide plate before the steel is thrown in the finishing mill, and the position control is switched to pressure control, and the tail short stroke control is executed at the tail. For the first control method, the strip head pressure control is maintained before the tail short stroke, and for the strip width super wide problem, the edge of the strip and the side guide plate are easily extruded to cause edge damage. For the second control method, due to the steel throwing process in the finishing mill, the tail of the strip is generally in the deceleration state, at this time the stability of the tail of the strip is poor, and the left and right movement is prone to occur, which is easy to cause the edge of the strip to scratch and cause the edge crack when the side guide plate is closed. In addition, the side guide plate adopts pressure control after the steel is thrown in the finishing mill, and for the strip with serious double side wave, the edge of the strip is easy to scratch with the side guide plate, which aggravates the pressure fluctuation of the side guide plate, causes the side guide plate to open or close back and forth, and thus causes the edge damage and the layer displacement of the coil. For high temperature soft steel, due to the loss of tension of the tail of the strip after the steel is thrown in the finishing mill, the tail of the strip is easy to move between the side guide plates and is easy to cause the edge damage of the tail under the extrusion of the side guide plate. For part of thin specification, silicon steel side guide plate, position control is needed, but due to the equipment precision, guide plate wear and other problems, the actual opening degree of the side guide plate is always larger than the set opening degree, which may cause the quality defects of the coil shape and the layer displacement, so in the actual production process, the position control strip often needs manual closing of the side guide plate to control the coil shape, which increases the workload of the operator.

[0005] The purpose of the present application is to provide a control method for improving the winding quality of the side guide plate of the coiler and improving automation. The control method for improving the winding quality of the side guide plate of the coiler and improving automation solves the problems of coil shape quality defects caused by traditional side guide plate pressure control and the need for manual intervention in the position control process of the side guide plate, solves the problems of edge damage, edge overflow, layer displacement and other quality problems in the prior art, and improves the automation control level. The winding quality is effectively improved, the automation control level is improved, the production cost is reduced, and the workload of the operator is reduced. SUMMARY

[0006] In order to achieve the above-mentioned purpose, the utility model provides a kind of control method for improving coiler side guide plate coiling quality and promoting automation, and coiler coiling process is composed of finishing work roll, laminar cooling roller way, rolled strip steel, laminar flow cooling device, side guide plate, upper pinch roll, lower pinch roll, assist coiling roll and reel, and strip steel head enters finishing work roll, is conveyed to side guide plate by laminar cooling roller way, laminar flow cooling device is equipped in the upper portion of laminar cooling roller way, and rolled strip steel is bent and guided by upper pinch roll and lower pinch roll, and is rolled up in reel, and assist coiling roll assists reel to roll steel.

[0007] W: strip steel width; W p : side guide plate preset opening degree; W S1 : side guide plate head first-stage short-stroke set opening degree; W S2 : side guide plate head second-stage short-stroke set opening degree; W S3 : side guide plate head third-stage short-stroke set opening degree; W t1 : side guide plate tail first-stage short-stroke opening amount; W

[0008] W t2 : side guide plate tail second-stage short-stroke opening amount; W Act : actual opening degree after side guide plate position control or pressure control;

[0009] y1: strip steel head distance pinch roll front 5.5 meters when entering side guide plate; y2: coiling pinch roll bites steel; y3: mandrel builds tension;

[0010] x1: strip steel tail distance pinch roll front 14-18 meters; x2: strip steel tail distance pinch roll front 4-8 meters.

[0011] Further explanation

[0012] When strip steel head enters side guide plate, side guide plate is closed to head first-stage short-stroke set opening degree;

[0013] When strip steel head enters pinch roll, side guide plate is closed to head second-stage short-stroke set opening degree;

[0014] After mandrel builds tension, side guide plate is closed to head third-stage short-stroke set opening degree, and position control is converted into pressure control;

[0015] When pressure control reaches set time, both sides of side guide plate are opened 3-4mm, preferably 3mm, and position control is maintained at current opening degree;

[0016] In position control process, when both sides of side guide plate pressure exceeds set value 1.5 times, side guide plate is switched from position control to pressure control;

[0017] When strip steel tail distance pinch roll front x1, side guide plate is opened to tail first-stage short-stroke;

[0018] When the tail of the strip is 14-18 meters away from the front of the pinch roll, the tail of the first short stroke of the side guide is opened by 10-40 mm.

[0019] Further explanation

[0020] A control method for improving the winding quality of the side guide of the coiler and improving automation has the following technical solutions:

[0021] When the head of the strip enters the side guide, the side guide is closed to the head of the first short stroke to set the opening degree, combined with the head winding stability and quality control, the set value of the head of the first short stroke is the width of the strip plus 40-50 mm, and the preferred value is 40 mm.

[0022] When the head of the strip enters the pinch roll, the side guide is closed to the head of the second short stroke to set the opening degree, combined with the head edge loss and roll shape control, the set value of the head of the second short stroke is the width of the strip plus 15-20 mm, and the preferred value is 18 mm.

[0023] After the mandrel is tensioned, the side guide is closed to the head of the third short stroke to set the opening degree, combined with the head edge loss and roll shape control, the set value of the head of the third short stroke is the width of the strip plus 5-8 mm, and the preferred value is 6 mm.

[0024] After the third short stroke ends, the side guide is controlled according to the pre-set pressure, in order to ensure that the side guide completely contacts and presses against the strip, when the pressure control time reaches 4-6 seconds, preferably 5 seconds, in order to avoid quality defects caused by long-time extrusion of the side guide and the strip, the side guide is opened by 3-4 mm on both sides, preferably 3 mm, and the current opening degree is maintained for position control.

[0025] Further explanation

[0026] During the position control process, since part of the strip may have an over-wide problem, when the pressure of both side guides exceeds the set value by 1.5 times, the side guide is switched from position control to pressure control;

[0027] Since the width of the tail of the strip extends greatly after rolling, in order to prevent edge loss and edge overflow defects of the tail of the strip, combined with different steel grades, specifications and over-wide conditions, the over-wide amount of the tail of the strip is controlled within 0-60 mm, when the tail of the strip reaches 14-18 meters away from the front of the pinch roll, 4-8 meters, the tail of the short stroke is moved, and the side guide is opened by a certain amount, so as to reduce the generation of tail edge loss and edge overflow defects.

[0028] When the tail of the strip is 14-18 meters away from the front of the pinch roll, preferably 15 meters, the tail of the first short stroke of the side guide is opened by 10-40 mm.

[0029] When the tail of the strip is 4-8 meters away from the pinch roll, preferably 6 meters, the tail of the side guide plate is opened by 10-20 mm in the second stage short stroke; until the winding is completed.

[0030] The control method for improving the winding quality and automation of the side guide plate of the winding machine combines the position control function of the side guide plate and the pressure control function. Through the method, the quality problems such as edge damage, edge overflow and winding layer displacement of some special steel grades during the winding process can be effectively improved. At the same time, the position control strip needs to be used for the full length of the side guide plate. Due to the problems such as guide plate wear and precision, manual closing of the side guide plate is required in the actual production process. The method can realize full-automatic control of the part of the position control strip, reduce manual intervention, and improve the automation level. The method is simple and effective, and can greatly reduce the quality defects such as edge damage, winding layer displacement and edge overflow, improve the automation control level, reduce the production cost, and reduce the labor load. BRIEF DESCRIPTION OF DRAWINGS

[0031] The present application will be further described below in conjunction with the drawings and examples.

[0032] Figure 1 The flowchart of the treatment method of the present application.

[0033] Figure 2 The structure diagram of the finishing mill of the present application.

[0034] Figure 3 The schematic diagram of the side guide plate assisting the strip winding.

[0035] Figure 4 The schematic diagram of the short stroke movement of the side guide plate.

[0036] Figure 2 Medium: finishing work roll 1, laminar cooling roller 2, rolled strip 3, laminar cooling device 4, side guide plate 5, upper pinch roll 6, lower pinch roll 7, winding assisting roll 8, winding drum 9. DETAILED DESCRIPTION

[0037] Example 1:

[0038] According to the head of the strip entering the side guide plate, the side guide plate is closed to the head of the first stage short stroke set opening degree, and the first stage short stroke set value of the head is 40-50 mm wider than the strip, preferably 40 mm.

[0039] According to the strip head tracking calculation position, when the strip head enters the pinch roll, the side guide plate is closed to the head second short stroke set opening, and the head second short stroke set value is the strip width plus 15-20mm, preferably 18mm.

[0040] After the mandrel is built, the side guide plate is closed to the head third short stroke set opening, and the head third short stroke set value is the strip width plus 5-8mm, preferably 6mm.

[0041] According to the strip tail tracking, when the strip tail is 14-18 meters away from the front of the pinch roll, preferably 15 meters, the side guide plate tail first short stroke is opened by 10-40mm.

[0042] According to the strip tail tracking, when the strip tail is 4-8 meters away from the front of the pinch roll, preferably 6 meters, the side guide plate tail second short stroke is opened by 10-20mm; until the winding is completed.

[0043] Example Two:

[0044] According to the strip head tracking calculation position, when the strip head enters the side guide plate, the side guide plate is closed to the head first short stroke set opening, and the head first short stroke set value is the strip width plus 40-50mm, preferably 40mm.

[0045] After the mandrel is built, the side guide plate is closed to the head third short stroke set opening, and the head third short stroke set value is the strip width plus 5-8mm, preferably 6mm.

[0046] After the third short stroke ends, the side guide plate is controlled according to the preset pressure, and when the pressure control time reaches 4-6 seconds, preferably 5 seconds, the two sides of the side guide plate are opened by 3-4mm, preferably 3mm, and the current opening is maintained for position control.

[0047] In the position control process, when the pressure of the two side guide plates exceeds the set value by 1.5 times, the side guide plate is switched from position control to pressure control.

[0048] According to the strip tail tracking, when the strip tail is 14-18 meters away from the front of the pinch roll, preferably 15 meters, the side guide plate tail first short stroke is opened by 10-40mm.

[0049] According to the strip tail tracking, when the strip tail is 4-8 meters away from the front of the pinch roll, preferably 6 meters, the side guide plate tail second short stroke is opened by 10-20mm; until the winding is completed.

[0050] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application, and any equivalent control or modification made according to the spirit and essence of the main technical solution of the present application should be covered in the protection scope of the present application.

Claims

1. A control method for improving the winding quality of the side guide of a coiler and enhancing automation, characterized by: When the strip head enters the side guide, the side guide closes to the opening set at the first short stroke of the head; When the strip head enters the pinch roller, the side guide is closed to the second-stage short stroke setting opening of the head; After the core shaft is stretched, the side guide is closed to the third-level short stroke setting opening of the head, and the position control is converted to pressure control; When the pressure control reaches the set time, both sides of the side guide are opened 3-4mm and the current opening is maintained for position control; During the position control process, when the pressure of the guide plates on both sides exceeds 1.5 times the set value, the side guide plates will automatically switch from position control to pressure control; When the tail of the strip is 14-18 meters away from the pinch roller, the side guide is opened to the tail level short stroke; When the tail of the strip is 4-8 meters away from the pinch roller, the side guide is opened to the tail for a short secondary stroke until the coiling is completed.

2. The method according to claim 1, wherein: The first-level short stroke setting value of the head is the strip width plus 40-50mm, the second-level short stroke setting value is the strip width plus 15-20mm, and the third-level short stroke setting value is the strip width plus 5-8mm; The first-stage short-stroke opening amount of the tail is 10-40 mm, and the second-stage short-stroke opening amount of the tail is 10-20 mm.

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