A control method for rapid positioning of vertical rollers in a hot rolling roughing mill

Abstract

The present invention relates to a control method for the rapid positioning of the vertical rollers of a hot rolling roughing mill, and belongs to the field of metal continuous rolling control. The method comprises the following steps: S1, collecting the target control width of the rolled piece; S2, the process machine calculates the minimum setting value for the opening of the vertical rollers according to the target control width, so that the head of the rolled piece in the second or fourth pass can just pass through the vertical rollers; S3, respectively setting the opening proportional coefficient and the closing proportional coefficient of the vertical roller pressing cylinder according to the pressure of the vertical roller pressing cylinder and the balancing cylinder; S4, increasing the closing proportional coefficient. This solution optimizes the opening stroke of the vertical rollers, adjusts the pressure of the vertical roller pressing cylinder and the balancing cylinder, matches the opening and closing speeds according to the pressure of the two, reduces the positioning time of the vertical rollers, and realizes rapid positioning of the rough rolling vertical rollers.

Description

Technical Field

[0001] The invention belongs to the field of metal continuous rolling control and relates to a control method for rapid positioning of vertical rollers of a hot continuous rolling roughing mill. Background Art

[0002] Roughing vertical rolls are important equipment in hot rolling production lines. They are attached to the entrance side of the four-roll roughing mill and are used to control the width and shape of the slab. At the same time, they change the edge of the slab from the cast structure to the rolled structure to avoid edge cracks during horizontal rolling.

[0003] In the prior art, after the second or fourth pass of rough rolling is completed, the side guide plates are normally positioned, and at the same time, the vertical rollers are opened to the maximum value. After the side guide plates are positioned, it is necessary to wait for the vertical rollers to be positioned to the set value. After the vertical rollers are positioned, the third or fifth pass of steel feeding is carried out. The vertical rollers take a long time to swing, which makes the time for the side guide plates to wait for the vertical rollers to be positioned long, and the third or fifth pass of steel feeding is slow, resulting in a poor overall rolling rhythm of hot rolling and an unsmooth working process of the production line, which has an adverse effect on the efficiency of hot rolling. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a control method for the rapid positioning of the vertical rollers of a hot rolling roughing mill, solve the problem of waiting for the vertical rollers to be positioned, reduce the positioning time of the third (fifth) pass of the roughing vertical rollers, and improve the steel feeding rhythm of the third (fifth) pass of the roughing mill to meet the overall rolling rhythm of the hot rolling mill.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for controlling the rapid positioning of vertical rollers of a hot rolling mill comprises the following steps:

[0007] S1. Collect the target control width of the rolled piece;

[0008] S2. The process machine calculates the minimum setting value of the vertical roller opening according to the target control width, so that the head of the rolled piece can just pass through the vertical roller in the second or fourth pass;

[0009] S3. Under the condition that the pressure of the vertical roller pressing cylinder is balanced with the pressure of the balancing cylinder, set the opening proportional coefficient and the closing proportional coefficient of the vertical roller pressing cylinder respectively;

[0010] S4. Increase the closing ratio coefficient.

[0011] Furthermore, in S2, the formula for calculating the minimum setting value for opening the vertical roller is:

[0012] Minimum setting value = target control width + K

[0013] Here, K is a constant greater than 0. K can take a very small positive value so that the distance between the vertical rollers just meets the passing conditions of the rolled piece, maximizing the shortening of the vertical roller positioning stroke. K greater than 0 is the theoretical value range. In actual production, factors such as the deviation of the rolled piece's motion trajectory need to be considered.

[0014] Furthermore, the value of K is 70 mm. 70 mm can guarantee the normal movement of the rolled piece to the greatest extent possible, that is, even if the rolled piece has a deviation in its motion trajectory, it will not collide with the vertical rollers. In this case, the vertical roller stroke is minimized as much as possible, shortening the waiting time.

[0015] Furthermore, the closing coefficient ranges from 0.01 to 0.1. Because the vertical rollers are subject to the force of the vertical roller pressure cylinder in the closing direction and simultaneously need to withstand the balancing force of the balancing cylinder in the opening direction, it is necessary to fine-tune the pressure of the vertical roller pressure cylinder and the balancing cylinder within the design capacity to match their speeds. This solution limits the closing coefficient to a specific range based on pressure balance, thereby increasing the closing speed of the vertical rollers.

[0016] The beneficial effects of the present invention are:

[0017] Compared with the existing technology, this solution optimizes the opening stroke of the vertical roller. While ensuring that the head of the rolled piece passes through the vertical roller smoothly in the second or fourth pass, it calculates a reasonable opening setting value instead of directly opening it to the maximum value, thereby reducing the swing stroke. At the same time, this solution separates the closed-loop control proportional coefficients for opening and closing the vertical roller clamping cylinder, instead of sharing the same closed-loop control proportional adjustment coefficient. It also refines the pressure of the vertical roller clamping cylinder and the balancing cylinder, and matches the opening and closing speeds according to the pressure of the two, thereby reducing the vertical roller swing time and achieving rapid swing of the rough rolling vertical roller.

[0018] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a flow chart of a method for controlling the rapid positioning of vertical rolls in a hot rolling roughing mill according to the present invention;

[0021] Figure 2 This is a comparison chart of the vertical roller positioning time before and after optimization of the method of the present invention;

[0022] Among them, (a) is the vertical roller positioning time diagram before optimization, and (b) is the vertical roller positioning time diagram after optimization. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] See also Figures 1 and 2 , is a control method for the rapid positioning of the vertical rollers of a hot rolling roughing mill, comprising the following steps:

[0027] S1. Collect the target control width of the rolled piece.

[0028] S2. The process machine calculates the minimum setting value of the vertical roller opening according to the target control width, so that the head of the rolled piece can just pass through the vertical roller in the second or fourth pass;

[0029] The formula for calculating the minimum setting value of the vertical roller opening is:

[0030] Minimum setting value = target control width + K

[0031] Among them, the value of K is 70mm.

[0032] S3. According to the balance between the pressure of the vertical roller pressing cylinder and the pressure of the balancing cylinder, the opening proportional coefficient and the closing proportional coefficient of the vertical roller pressing cylinder are set respectively;

[0033] S4. Increase the closing ratio coefficient.

[0034] In specific implementation, the maximum extent to which the vertical rollers of the hot rolling mill can be opened varies depending on the model of the hot rolling mill. Since the equipment model is not specifically designed, the maximum extent to which the vertical rollers can be opened may be quite different from the set value required for positioning during operation. For example, in a certain signal, the maximum extent to which the vertical rollers can be opened is 1780mm. In the existing control method, the side guide plates are normally positioned after the second or fourth pass of rolling, and the vertical rollers have been opened to 1780mm. After the side guide plates are positioned in place, it is necessary to wait for the vertical rollers to be positioned to the set value. When the third or fifth pass of steel rolling is carried out, the vertical rollers need to be positioned from the maximum width of 1780mm to the set value. In this solution, the opening does not need to be opened to the maximum of 1780mm during the second or fourth rolling process, but is opened to the minimum setting value so that the head of the workpiece can just pass through the vertical roller. During the subsequent third or fifth rolling, the vertical roller positioning stroke is greatly reduced, so that the time the side guide plate waits for the vertical roller positioning after completing the positioning is minimized. After the previous action is completed, the next action is performed in the shortest time, which not only makes the production rhythm more compact and maximizes production efficiency, but also prevents the workpiece from being displaced due to other reasons during the waiting time, thereby affecting production.

[0035] Because the vertical roller is subjected to the force of the vertical roller pressing cylinder in the closing direction and needs to withstand the balancing force of the balance cylinder in the opening direction, it is necessary to fine-tune the pressure of the vertical roller pressing cylinder and the balance cylinder within the design capacity to match the speed of the two. This solution separates the proportional coefficients of the opening and closing of the vertical roller pressing cylinder instead of sharing the same closed-loop control proportional adjustment coefficient. The pressure of the vertical roller pressing cylinder and the balance cylinder is fine-tuned, and the opening and closing speeds are matched according to the pressure of the two. The proportional coefficient when closing is increased to the range of 0.01 to 0.1, which is lower than the original proportional coefficient of 6.5e. -3 Depending on the situation, the closing speed is generally increased by more than 2 times, and the minimum is increased by 1.5 times.

[0036] The positioning time of the third and fifth passes of the roughing rolls was optimized. Before the optimization, the waiting time for the vertical rolls to be positioned in each pass was about 9s, while after the optimization it was about 5s, which is about 4s less for each pass. Each rolled piece undergoes two passes, and the fastest rhythm is increased by about 8s. The roughing rhythm is greatly improved to meet the overall rolling rhythm of hot rolling.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the rapid positioning of vertical rollers in a hot rolling mill, characterized by: A method for controlling the rapid positioning of vertical rollers of a hot rolling mill comprises the following steps: S1. Collect the target control width of the rolled piece; S2. The process machine calculates the minimum setting value of the vertical roller opening according to the target control width, so that the head of the rolled piece can just pass through the vertical roller in the second or fourth pass; S3. Under the condition that the pressure of the vertical roller pressing cylinder is balanced with the pressure of the balancing cylinder, set the opening proportional coefficient and the closing proportional coefficient of the vertical roller pressing cylinder respectively; S4, increase the closing ratio coefficient; In the step S1, the formula for calculating the minimum setting value for opening the vertical roller is: Minimum setting value = target control width + K; Here, K is a constant greater than 0.

2. The method for controlling the rapid positioning of vertical rollers of a hot rolling roughing mill according to claim 1, characterized in that: The value of K is 70mm.

3. The method for controlling the rapid positioning of vertical rolls of a hot rolling roughing mill according to claim 1, characterized in that: The value range of the shutdown scale factor is 0.01~0.1.

Images