JP4759825B2 - Speed control method for continuous processing line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speed control method for a continuous processing line, and in particular, continuous processing suitable for use in a metal strip continuous processing line such as a continuous annealing line or a continuous plating line of a steel strip (also referred to as a steel strip) is possible. The present invention relates to a speed control method for a continuous processing line capable of efficiently controlling the sheet feeding speed even when the looper capacity is insufficient in the equipment having the strip storage device (hereinafter referred to as “looper”).
[0002]
[Prior art]
For example, as shown in FIG. 1, the continuous processing line of the metal strip S such as a steel strip is generally roughly divided into three sections of an entry side section 1, a central section 3 and an exit side section 5, and an entry side section 1- The loopers 2 and 4 are arranged between the central section 3 and between the central section 3 and the outgoing section 5, respectively.
[0003]
The entry side section 1 is mainly intended to pay out a strip wound up in a coil C shape. For example, a welding machine 6 is provided in the entry side section 1 so that the sequentially discharged coils are connected by welding. The central section 3 is a section that performs main processing such as heat treatment, chemical treatment, and plating treatment. The exit section 5 is mainly intended to cut the strip S that has been processed into a predetermined length by, for example, a cutting machine 7 and to wind it around the coil C again.
[0004]
The looper continuously feeds the strip S to the central section 3 when the incoming section 1 or the outgoing section 5 stops for welding or cutting of the coil, or continuously from the central section 3. It is a strip storage device for paying out.
[0005]
Conventionally, the length of the strip S that can be temporarily stored in the looper (hereinafter referred to as “looper capacity”) includes the low speed operation time including the stop of the entry side section 1 and the exit side section 5, its speed, and the central section. 3 was designed so that welding or cutting was possible even when the central section 3 was at maximum speed.
[0006]
On the other hand, after the metal strip continuous processing line is constructed, the equipment in the central section 3 may be strengthened to increase the plate passing speed in the central section in order to improve productivity. In such cases, the capacity of the looper installed on the entry side or the exit side is often insufficient relative to the processing capacity of the central section. During handling operations such as coil cutting, it was necessary to make the speed of the central section slower than the steady speed. At this time, since the operator manually adjusts the line speed, the operator cannot concentrate on the handling work on the entry side or the exit side, but also starts deceleration or accelerates faster than necessary for the shortage of the looper. However, there was a problem that productivity was poor.
[0007]
In order to perform coil switching work on the entry side or the exit side section, when the passage speed of the central section is slowed down, for example, Japanese Patent Laid-Open No. 6-126333 or Japanese Patent Laid-Open No. The following technologies have been proposed.
[0008]
Japanese Patent Laid-Open No. 6-126333 discloses a continuous steel sheet processing line in which a coiled steel sheet is discharged from an entry section, processed in a central section, and then wound again in a coil shape through an exit section. Alternatively, the center for managing the remaining amount of the input looper and the output looper from the set maximum required stop time, minimum operable speed, and steady speed determined for each coil necessary for handling operation in the output section. Deciding the deceleration rate of the section speed, the looper remaining amount (metal strip amount accumulated in the looper) of the input side looper or the output side looper is less than the looper remaining amount determined from the deceleration rate and the set minimum looper remaining amount. At this point, it is described that the vehicle starts decelerating at the deceleration rate.
[0009]
Japanese Patent Laid-Open No. 10-35968 discloses an operator who has trouble that the working time in the entry side or the exit side becomes longer than the time assumed at the time of designing due to re-welding or re-winding. Predicting the time that will occur for the work to be performed, and by selectively pressing the work time extension button a predetermined number of times based on the prediction, the extension time in the entry side or the exit side will be In order to change, it is described that the line speed of the central portion is automatically calculated by the host computer (P / C) and the speed is set.
[0010]
[Problems to be solved by the invention]
However, in the former Japanese Patent Application Laid-Open No. Hei 6-126333, the capacity of the looper is insufficient with respect to the steady speed of the central section as described above, and the central section speed is maintained at a steady speed set at a value close to the maximum speed. On the other hand, in equipment where coil switching cannot be performed, the timing of deceleration is too late, so there is a problem that sudden acceleration and deceleration must be performed after taking the risk of furnace buckling and meandering. It was.
[0011]
In the latter technique disclosed in Japanese Patent Laid-Open No. 10-35968, it is necessary to push a push button for each coil in the equipment in which the capacity of the looper is insufficient with respect to the steady speed of the central section as described above. In addition to being complicated, if you forget to push it, a line trouble may occur, which may reduce the production efficiency.
[0012]
Since the present invention performs the handling operation as described above, when the speed of the entry section or the exit section is reduced, the capacity of the looper is insufficient, and the center section speed must be reduced. In this case, it is possible to minimize the decrease in production due to the speed reduction in the center section without causing problems such as buckling and meandering caused by the rapid deceleration in the center section due to timing delay. To ensure high production efficiency.
[0013]
[Means for Solving the Invention]
In order to achieve the above object, the present invention provides a method for controlling the center section speed of a metal strip in a line for continuously processing a metal strip having an entry section, a center section, and an exit section. Set the normal speed and deceleration rate to the predetermined values and start the deceleration from the speed synchronized with the central section of the entry or exit section for handling work before the deceleration rate of the central section speed. The deceleration to the unsteady speed is completed.
[0014]
At this time, the acceleration rate of the central section speed is set to a predetermined value, and following the processing at the unsteady speed of the central section speed, the speed in the inlet section or the outlet section is accelerated to increase the speed of the central section. It is preferable to start accelerating the central section speed at the acceleration rate at the time coincident with the unsteady speed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
First, a first embodiment of the present invention, which is suitable for central section speed control when performing entry-side handling such as coil switching on the entry side, will be described in detail with reference to FIG.
[0017]
In the steady state, the entry-side section speed V1 is passed as the same speed as the steady speed Vc of the central section, that is, V1 = Vc. In order to increase productivity, Vc is often operated near the maximum speed of the continuous processing equipment.
[0018]
In the present embodiment, the unsteady speed Vcd1 and the deceleration rate D1 of the central section for performing the handling work in the entry side section are set to predetermined values. As this predetermined value, for example, Vcd1 is determined based on the information on the metal strip such as the width and thickness of the metal strip (also referred to as a metal strip) that affects the welding time, or the information on the line of the welding machine or the like. The time required for handling may be estimated empirically, and the speed may be set so that this time can be secured. In order to ensure productivity, D1 is used to pass through a metal strip that passes through such as meandering and buckling. What is necessary is just to set it as the maximum value in the range which does not cause a trouble. These Vcd1 and D1 may be values determined empirically. In order to arbitrarily set the predetermined value, for example, an operation device structure that allows manual input so as to be arbitrarily set may be adopted. Note that Vcd1 and D1 may be predicted from coil information or the like instead of manual input, and these values may be incorporated in the central section speed control system in advance.
[0019]
In this way, Vcd1 and D1 are set to predetermined values in advance, and before the start of deceleration from the speed synchronized with the central section of the entry side section for handling work, from the steady speed Vc of the central section speed. The deceleration start timing of the central section is determined so that the deceleration to the unsteady speed Vcd1 is completed.
[0020]
That is, the central section speed deceleration start time Tc1 is from Vc, Vcd1, and D1 with respect to the time T1 when a command to start deceleration is issued from the speed at which the previously set entrance section speed is synchronized with the central section. Considering the time required to change the required central section speed to the unsteady speed, the deceleration timing is determined so that this time can be secured. Further, when considering the time required for this change, it may be set for each coil, but the metal strips to be processed may be grouped to some extent and given the same time within the same group.
[0021]
The time required for handling such as coil exchange on the entry side is predicted in advance from information on the metal strip or information on line equipment such as a welding machine. In order to secure the time required for handling the metal strip, the remaining coil When the amount reaches a predetermined value, the speed V1 of the entry side section is released from the synchronization with the speed Vc of the central section, and is set to start deceleration independently.
[0022]
In this embodiment, the deceleration rate D1 of the central section speed and the speed Vcd1 after deceleration are set as described above, and deceleration from a speed synchronized with the central section of the entry side section for handling work is started. At a previous time point, the central section speed is reduced so that the central section has been decelerated to Vcd1.
[0023]
The incoming section speed is synchronized with the central section speed until the start of deceleration starting from the speed synchronized with the central section for handling work that has been set in the past. Similarly, decelerate. Therefore, the remaining amount of the looper can be secured from Tc1 to T1 until the same amount as that at the steady speed.
[0024]
In FIG. 2, the central section speed starts decelerating at a timing when the entry side section speed passes through Vcd1 to some extent, but T1 is the time immediately after the entry side section speed becomes Vcd1. At the same time, deceleration of the central section speed may be started.
[0025]
In this way, by controlling the central section speed, there is no danger of suddenly decelerating the central section speed, and there is no risk of buckling or meandering through the threading of the central section. The decrease in the amount can be minimized, and good production efficiency can be ensured.
[0026]
Next, the speed of the central section when the handling in the entry section is finished and the entry section is accelerated will be described. When the handling in the entry section ends, the entry section starts to accelerate at time T2. The acceleration rate A1 of a predetermined central section speed is arbitrarily set at a time before the acceleration in the entry side section, and at the time Tc2 when the entry side section speed reaches Vcd1, the center section speed is increased to Vc at A1. It is preferable to accelerate.
[0027]
The acceleration rate A1, like the deceleration rate D1, is set to a maximum value in a range where the metal strip to pass through does not cause a plate passing trouble such as meandering or buckling in order to ensure productivity. The value may be determined empirically. In order to arbitrarily set the predetermined value, for example, an operation device structure that allows manual input so that it can be arbitrarily set may be adopted. A1 is set when Vcd1 and D1 are set. Also good. Instead of manual input, A1 may be predicted from the coil information before feeding and this value may be incorporated in the central section speed control system in the same manner as Vcd1 and D1.
[0028]
By accelerating the central section speed in this way, it is possible to minimize the threading time at the unsteady speed of the central section without causing a trouble of threading and to enable efficient operation.
[0029]
At this time, the speed of the entry section is the same as before, after the handling on the entry side is completed, after accelerating to a speed greater than Vc at a predetermined acceleration rate, this speed is maintained, and the looper remaining capacity is reduced. A sufficient amount, specifically close to 100%, may be accumulated before tuning to the central section speed Vc.
[0030]
An example of the processing procedure of the central section speed control method as described above is shown in FIG.
[0031]
Next, a second embodiment of the present invention applied to the central section speed control when performing the output side handling such as the coil switching in the output side section will be described in detail with reference to FIG.
[0032]
First, in the steady state, the outgoing section speed V2 is passed as the same speed as the stationary speed Vc of the central section, that is, V2 = Vc, like the incoming section.
[0033]
In the present embodiment, the unsteady speed Vcd2 and the deceleration rate D2 for dealing with the handling work of the central section are set to predetermined values. The predetermined value is derived from information on the metal strip such as the number of samples taken for inspection of the metal strip, or information on the line of the cutting machine, which affects the time required for cutting the metal strip. The time required for the handling on the side should be estimated empirically, and the speed should be such that this time can be secured. In order to ensure productivity, the D2 has a metal strip that passes through such as meandering and buckling. What is necessary is just to set it as the value calculated | required empirically so that it may become the maximum value in the range which does not cause a boarding trouble. In order to arbitrarily set the predetermined value, for example, an operation device structure that allows manual input so as to be arbitrarily set may be adopted. Instead of manual input, Vcd2 and D2 may be predicted from coil information and the like, and these values may be incorporated in the central section speed control system in advance.
[0034]
In this way, Vcd2 and D2 are set to predetermined values in advance, and before the start of deceleration from the speed synchronized with the central section of the outgoing section for handling work, the steady speed Vc of the central section speed is started. The deceleration start timing of the central section is set in the same manner as the deceleration of the incoming section so as to complete the deceleration to the unsteady speed Vcd2.
[0035]
That is, the central section speed deceleration start time Tc3 is from Vc, Vcd2, and D2 with respect to the time T3 when a command to start deceleration from a speed synchronized with the central section of the outgoing section speed, which has been set in the past, is given later. Considering the time required to change the required central section speed to the unsteady speed, the deceleration timing may be determined so as to ensure this time. Further, when considering the time required for this change, it may be set for each coil, but the metal strips to be processed may be grouped to some extent and given the same time within the same group.
[0036]
The time required for handling due to cutting of the metal strip on the delivery side is predicted in advance from information on the metal strip or information on the line of the cutting machine or the like. The speed V2 of the side section is set to start the deceleration independently from the synchronization with the speed Vc of the central section.
[0037]
In this embodiment, the deceleration rate D2 of the central section speed and the speed Vcd2 after deceleration are set as described above, and deceleration from a speed synchronized with the central section of the outgoing section for handling work is started. At the previous time, the central section speed is reduced so that the speed of the central section is completed and Vcd2 is obtained. Until the start of deceleration from the speed synchronized with the central section of the outgoing section for the handling operation, the outgoing section speed is synchronized with the central section speed until the central section speed is reduced. Will slow down as well. Therefore, the remaining amount of the looper can be ensured to be the same as that at the steady speed while the outlet section speed is decelerating the central section speed.
[0038]
Next, the speed of the central section when the handling in the exit section is finished and the exit section is accelerated will be described. When the handling in the outgoing section ends, the outgoing section starts to accelerate at time T4. The acceleration rate A2 of a predetermined central section speed is arbitrarily set at a time before acceleration in the outgoing section, and at the time Tc4 when the outgoing section speed reaches Vcd2, the central section speed is increased to Vc at A2. It is preferable to accelerate.
[0039]
As in the case of the deceleration rate D2, the acceleration rate A2 is experienced so that the metal strip that passes through in order to ensure productivity is the maximum value within a range that does not cause troubles such as meandering and buckling. The value may be determined as desired. In order to arbitrarily set the predetermined value, for example, a device structure that allows manual input so that it can be arbitrarily set may be adopted, and A2 may be set when Vcd2 and D2 are set. . Instead of manual input, A2 may be predicted before passing through the coil information, and this value may be incorporated in the central section speed control system in the same manner as Vcd2 and D2.
[0040]
By accelerating the central section speed in this way, it is possible to minimize the threading time at the unsteady speed of the central section without causing a trouble of threading and to enable efficient operation.
[0041]
At this time, the speed of the exit section is the same as in the past, after the handling on the exit side is completed, after accelerating to a speed greater than Vc at a predetermined acceleration rate, this speed is maintained and the looper remaining capacity is maintained. Should be accumulated to a sufficient amount, specifically close to 100%, and then tuned to the central section speed Vc.
[0042]
The central speed control as described above may be performed when a looper having the above-described problems exists, and when a looper having the above-described problems is installed on both the entry side and the exit side, the exit side and the entry side are provided. The above-described control may be performed, and if it is provided only on the input side or only on the output side, it may be performed only on the side that needs to be dealt with.
[0043]
【Example】
In a continuous annealing furnace having loopers on the entry side and the exit side, the control method of the present invention was applied and the effect was examined. Compared is a conventional method in which all of the central section speed control is done manually by the operator. According to the present invention, productivity (production amount per unit time) can be improved by 7% compared to the conventional case.
[0044]
【The invention's effect】
According to the present invention, even when the capacity of the looper installed on the entry side or the exit side is low, the plate-passability of the metal strip is ensured during handling operations on the entry side section or the exit side section of the continuous processing line. Above, the deceleration of the central section speed to the unsteady speed can be suppressed to the minimum necessary level. Therefore, unnecessary deceleration of the central section speed can be prevented, the average speed can be improved, and productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a continuous processing line of a metal strip to which the present invention is applied. FIG. 2 is a central section speed control method according to a first embodiment of the present invention applied when performing entrance-side handling. FIG. 3 is a flowchart illustrating an example of a processing procedure according to the first embodiment. FIG. 4 illustrates a control method of the central section speed according to the second embodiment of the present invention applied when performing the outgoing side handling. Time chart [Explanation of symbols]
S ... Metal strip 1 ... Incoming section 3 ... Central section 5 ... Outgoing sections 6, 7 ... Looper

Claims (2)

In controlling the central section speed of a metal strip in a line that continuously processes a metal strip having an entry section, a center section, and an exit section,
Set the unsteady speed and deceleration rate of the central section to the prescribed values,
Before the start of deceleration from the speed synchronized with the central section of the entry or exit section for handling work,
A speed control method for a continuous processing line, characterized in that the deceleration to the unsteady speed by the deceleration rate of the central section speed is completed. The acceleration rate of the central section speed is set to a predetermined value, and following the processing at the unsteady speed of the central section speed, the speed in the inlet section or the outgoing section is accelerated so that the central section speed is unsteady. 2. The speed control method for a continuous processing line according to claim 1, wherein the acceleration at the acceleration of the central section speed is started when the speed matches the speed.

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