Coiling machine side guide plate control method for improving edge quality of hot rolled strip steel

Abstract

The invention relates to a coiler side guide plate control method for improving the edge quality of hot rolled strip steel. The method comprises the steps that the head opening degree of a coiler front side guide plate is set; after the pinch roll grips the strip steel for 0.5 second, the side guide plate is converted into a pressure feedback control mode; when the head of the strip steel enters a pinch roll and is smoothly wound on a winding mandrel, and a wrapper roll is opened to the maximum position for 1 second, a side guide plate control mode is converted into a strip body control mode; and when unloading of two rolling mills in the rolling mills of the continuous rolling unit is completed, the side guide plate control mode is converted into a pressure feedback control mode. The side guide plate control strategy is dynamically adjusted according to different stages of strip steel machining, friction and impact between the strip steel and equipment can be reduced, equipment abrasion and fault risks are reduced, and the edge quality and production efficiency of the hot-rolled strip steel are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coiler control, and particularly to a coiler side guide control method for improving the edge quality of hot-rolled strip steel. Background Art

[0002] The coiling side guide is an important equipment tool to ensure good coiling shape of hot-rolled strip coils and prevent and reduce strip steel deviation. In the early stage of side guide control, due to the limitation of mechanical structure, a position control mode was adopted. After the later new coiling side guide equipment adopted a hydraulic system, most of the side guides were changed to a strip steel head position control + pressure control mode. The strip steel head adopts position control, and the strip body and strip tail processes adopt a pressure feedback control mode. The coiling front side guide is pushed by a hydraulic cylinder to apply a certain pressure to the strip steel edge, clamp the strip steel, and keep the strip steel centered to prevent the strip steel from deviating. This method has better guaranteed the coiling shape of the strip steel. However, this control method also brings new quality problems and equipment losses.

[0003] Adopting the coiling side guide pressure feedback control mode will cause the side guide to always be in contact with the strip steel edge during coiling. And under the action of the hydraulic cylinder, there is also a certain side pressure (such as 30 - 100 KN). The side guide is in contact with the strip steel under pressure for a long time, which will cause relatively serious friction with the strip steel. The heat generated by the friction will cause the temperature of the strip steel edge to gradually rise until the wear-resistant plate of the side guide and the strip steel edge melt, resulting in a significant reduction in the service life of the coiling side guide. At the same time, the debris melted from the wear-resistant plate of the side guide and the debris scraped off from the strip steel edge will also be brought into the pinch roll, causing surface damage to the pinch roll. The falling debris will also be pressed into the strip steel itself, and the pressed debris will fall off during the subsequent cold rolling process as the strip steel is continuously rolled thinner. This leads to the phenomenon of "holes" in the strip steel, resulting in production and quality accidents. This kind of strip steel press-in surface quality defect seriously affects the quality of cold rolling series products and is prone to quality disputes. More importantly, there is usually no effective means to inspect the surface of the strip coil after coiling on the hot rolling production line. The above surface quality defects are difficult to inspect and be discovered, which will bring a series of uncontrollable problems to the next process, and this problem will be exacerbated as the rolling thickness decreases and the rolling speed increases. Summary of the Invention

[0004] To solve the above problems, the purpose of the embodiments of the present invention is to provide a coiler side guide control method for improving the edge quality of hot-rolled strip steel.

[0005] A coiler side guide control method for improving the edge quality of hot-rolled strip steel includes:

[0006] Step 1: Set the opening of the head of the coiling front side guide;

[0007] Step 2: After the pinch roll bites the strip steel for 0.5 seconds, switch the side guide plate to the pressure feedback control mode;

[0008] Step 3: When the head of the strip steel enters the pinch roll and is successfully wound around the coiling mandrel, and after the coiling assistant roll is opened to the maximum position for 1 second, switch the control mode of the side guide plate to the "strip body control mode";

[0009] Step 4: When two rolling mills in the continuous rolling mill unit are unloaded, switch the control mode of the side guide plate to the pressure feedback control mode.

[0010] Preferably, in Step 1, the head opening of the side guide plate = strip width + thermal expansion + manual correction.

[0011] Preferably, in Step 3, when the head of the strip steel enters the pinch roll and is successfully wound around the coiling mandrel, and after the coiling assistant roll is opened to the maximum position for 1 second, both side guide plates are simultaneously switched to position control, both side guide plates are simultaneously opened by 2 mm, and after the side guide plates are opened by 2 mm, enter the "micro-pressure" control stage; when the pressure sensor on the side guide plate detects that the contact pressure between the side guide plate and the strip steel reaches the manually set pressure reference value, continuously open the stressed side guide plate until the contact pressure between the side guide plate and the strip steel is lower than the trigger point.

[0012] Preferably, in Step 3, the stressed side guide plate moves in a step of 1 mm / s.

[0013] The present invention also provides an electronic device, including a bus, a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor. The transceiver, the memory, and the processor are connected through the bus. It is characterized in that when the computer program is executed by the processor, the steps in the above-mentioned coiler side guide plate control method for improving the edge quality of hot-rolled strip steel are realized.

[0014] The present invention also provides a computer-readable storage medium, on which a computer program is stored. It is characterized in that when the computer program is executed by a processor, the steps in the above-mentioned coiler side guide plate control method for improving the edge quality of hot-rolled strip steel are realized.

[0015] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0016] The present invention relates to a coiler side guide plate control method for improving the edge quality of hot-rolled strip steel. Compared with the prior art, the present invention dynamically adjusts the side guide plate control strategy according to different stages of strip steel processing, can reduce the friction and impact between the strip steel and the equipment, reduce the risk of equipment wear and failure, and significantly improve the edge quality and production efficiency of hot-rolled strip steel.

[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and makes a detailed description as follows. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a flowchart of a coiler side guide control method for improving the edge quality of hot-rolled strip provided by the present invention;

[0020] Figure 2 It is a schematic diagram of setting the head opening of the front side guide of the coiler provided by the present invention;

[0021] Figure 3 It is a control principle diagram after the pinch roll bites into the strip by 0.5 provided by the present invention;

[0022] Figure 4 It is a control principle diagram when the strip head enters the pinch roll provided by the present invention;

[0023] Figure 5 It is a control principle diagram of the strip tail part provided by the present invention;

[0024] Figure 6 It is a principle diagram of the operation window provided by the present invention;

[0025] Figure 7 It is a control principle diagram of the strip tail provided by the present invention. Detailed Embodiments

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the present invention, "a plurality of" means two or more unless specifically defined otherwise.

[0028] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Please refer to Figure 1 , a coiler side guide control method for improving the edge quality of hot-rolled strip steel, comprising:

[0030] Step 1: Set the opening of the front side guide of the coiler; the opening of the front side guide = strip width + thermal expansion + manual correction.

[0031] Step 2: After the pinch roll bites into the strip steel for 0.5 seconds, convert the side guide to the pressure feedback control mode;

[0032] Step 3: When the strip head enters the pinch roll and is successfully wound around the coiling mandrel, after the coiling assist roll opens to the maximum position for 1 second, convert the side guide control mode to the "strip body control mode";

[0033] In Step 3, when the strip head enters the pinch roll and is successfully wound around the coiling mandrel, after the coiling assist roll opens to the maximum position for 1 second, both side guides are simultaneously switched to the position control, both side guides are simultaneously opened by 2 mm, and after the side guides are opened by 2 mm, it enters the "micro-pressure" control stage; when the pressure sensor on the side guide detects that the contact pressure between the side guide and the strip steel reaches the manually set pressure reference value, continuously open the stressed side guide until the contact pressure between the side guide and the strip steel is lower than the trigger point.

[0034] Step 4: When two rolling mills in the continuous rolling mill unit are unloaded, convert the side guide control mode to the pressure feedback control mode.

[0035] The following further illustrates the control method of the side guide of the present invention with specific embodiments:

[0036] Such as Figure 2As shown in the figure, set the opening of the head of the front deflector of the coiler; the opening width of the side deflector = strip width + thermal expansion + manual correction.

[0037] As Figure 3 shown in the figure, after the pinch roll bites into the strip by 0.5 and can effectively drag the strip, the side deflector switches to the short-term pressure feedback control mode to ensure the coiling shape of the strip core before the tension between the mandrel and the rolling mill can be stably established. By applying pressure to the strip edge by the side deflector, the neutrality of the strip head is ensured, preventing the head from running off due to poor strip head shape or waviness.

[0038] As Figure 4 shown in the figure, when the strip head enters the pinch roll and is successfully wound around the coiling mandrel and a stable tension is established with the rolling mill, 1 second after the assisting roll swings to the maximum position is the trigger point for the side deflector to switch to position control. (Position control). On the human-machine interface screen of the operator, add the pressure trigger point when the side deflector switches to the position + micro-pressure control mode. (In KN). When the side deflector control process goes through the short-term pressure feedback stage and both sides open 2 mm simultaneously. If the side deflector pressure sensor still detects or detects again that the pressure of the side deflector on the strip edge reaches the manually set pressure trigger point, the side deflector on the stressed side will move again, with a moving step of 1 mm / s, continuously opening the side deflector on the stressed side until the contact pressure of the side deflector is lower than the trigger point. (Micro-pressure control) The maximum unilateral opening distance is 10 mm. (Can be adjusted according to the on-site coiling shape later).

[0039] As Figure 5 shown in the figure, when two rolling mills in the continuous rolling mill set are unloaded (select the upstream stand). The first-level control system of the rolling mill sends a signal to the first level of the coiler. The first-level control system of the coiler switches the side deflector control mode to the pressure feedback control mode.

[0040] As Figure 6 shown in the figure, at the same time, add operation windows of "strip body mode on", "trigger force value modification", "avoidance step", and "maximum avoidance amount" to facilitate the operator to make minor modifications according to the on-site situation.

[0041] As Figure 7 shown in the figure, add operation windows of "force control reference value", "force control correction coefficient", and "force control actual value" for the strip tail. (The set pressure of the side deflector can be adjusted according to the on-site coiling shape to further reduce the friction between the side deflector and the strip edge and reduce the edge damage of the strip tail).

[0042] The present invention fully utilizes the rolling characteristics of the strip, which has stable tension and almost no lateral movement, and changes the side guide plate pressure feedback control mode at this stage to a position control + micro-pressure control mode. It also continuously explores the adjustment amount of position control and micro-pressure control to find the best fit between this control mode and coil shape control. The core control part of the above scheme is the hot-rolled strip body. When rolling strips with a thickness of less than 3mm, the strip body length accounts for more than 80% of the entire strip length. Achieving effective position control and micro-pressure control of the strip edge by the coiling side guide in this part can significantly change the quality of the strip edge, reduce the amount of strip trimming in downstream processes, and improve the yield rate.

[0043] The present invention also provides an electronic device, comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, and is characterized in that when the computer program is executed by the processor, the steps in the above-mentioned method for controlling the side guide plate of a coiler for improving the edge quality of hot-rolled strip are implemented. Compared with the prior art, the beneficial effects of the electronic device provided by the present invention are the same as the beneficial effects of the method for controlling the side guide plate of a coiler for improving the edge quality of hot-rolled strip described in the above-mentioned technical solution, and will not be elaborated here.

[0044] The present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps in the above-mentioned method for controlling the side guide plate of a coiler for improving the edge quality of hot-rolled strip are implemented. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present invention are the same as the beneficial effects of the method for controlling the side guide plate of a coiler for improving the edge quality of hot-rolled strip described in the above-mentioned technical solution, and will not be repeated here.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A coiler side guide control method for improving the edge quality of hot-rolled strip steel, characterized in that, Including: Step 1: Set the opening of the front side guide head of the coiler. Step 2: After the pinch roll bites into the strip for 0.5 seconds, switch the side guide to the pressure feedback control mode. Step 3: When the strip head enters the pinch roll and is successfully wound around the coiling mandrel, 1 second after the coiling assistant roll is opened to the maximum position, switch the side guide control mode to the "strip body control mode". Step 4: When two rolling mills in the continuous rolling mill unit are unloaded, switch the side guide control mode to the pressure feedback control mode.

2. The coiler side guide control method for improving the edge quality of hot-rolled strip steel according to claim 1, characterized in that In the said Step 1, the opening of the front side guide head = strip width + thermal expansion + manual correction.

3. The coiler side guide control method for improving the edge quality of hot-rolled strip steel according to claim 2, characterized in that In Step 3, when the strip head enters the pinch roll and is successfully wound around the coiling mandrel, 1 second after the coiling assistant roll is opened to the maximum position, both side guides are simultaneously switched to position control, both side guides are simultaneously opened by 2 mm, and after the side guides are opened by 2 mm, enter the "micro-pressure" control stage; when the pressure sensor on the side guide detects that the contact pressure between the side guide and the strip reaches the manually set pressure reference value, continuously open the stressed side guide until the contact pressure between the side guide and the strip is lower than the trigger point.

4. A coiler side guide control method for improving the edge quality of hot-rolled strip steel according to claim 3, characterized in that, In the said Step 3, the stressed side guide moves in a step of 1 mm / s.

5. An electronic device, comprising a bus, a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected through the bus, and characterized in that, When the computer program is executed by the processor, it realizes the steps in a coiler side guide control method for improving the edge quality of hot-rolled strip as described in any one of claims 1-4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it realizes the steps in a coiler side guide control method for improving the edge quality of hot-rolled strip as described in any one of claims 1-4.

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