JPS6325846B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for controlling the meandering of the plate material in the continuous processing device in a facility in which a plate cold rolling mill and a continuous processing device, that is, a continuous annealing device or a continuous plating device and a skin pass rolling mill are directly connected. Regarding how to.

Conventionally, the continuous cold rolling equipment, which has multiple rolling mills arranged in tandem, and the continuous annealing equipment were placed on separate lines, but by connecting these two equipments, it is possible to improve work efficiency, improve product quality, and improve yield. Significant effects can be achieved, including improvements in energy efficiency, energy savings, and a reduction in the number of workers. However, if a situation arises in which the operation of any of the devices in such equipment must be stopped, the entire equipment must be stopped, and the above-mentioned effects are significantly diminished. Therefore, high reliability is required for the device itself and its operation and control.

By the way, in the above-mentioned continuous annealing equipment, the plate material is supported by a number of hearth rolls and heated and cooled while running, and the long plate material is pulled out by a bridle roll installed at the exit of the device. It is a common experience that the meandering phenomenon of the plate material occurs easily. If this meandering becomes severe, the plate material may eventually break, resulting in not only a stoppage of operation of the device, but also damage to the device due to the broken plate material. Therefore, conventionally, hearth rolls are equipped with a medium-high roll crown to improve centering of the plate and prevent meandering.
It is difficult to eliminate meandering with roll crown alone due to complex factors such as plate shape and changes in roll crown due to heat. Therefore, in the past, meandering detection devices were installed at various locations in the continuous annealing equipment, and based on the signals received, the hearth rolls at appropriate positions were tilted or changed direction to actively move the plate toward the center of the rolls. There is. However, even with these measures, it is not possible to completely prevent meandering, and when the meandering becomes severe, the running speed of the plate is reduced at the expense of work efficiency, and the plate is brought to the center of the roll. However, reducing the running speed of the plate material, for example in a continuous annealing furnace, will cause the plate material to stagnate in the furnace, and if this continues, it will overheat and there is a risk of melting, especially if it is a thin material, so it is not necessary to lower the furnace temperature. It's coming. However, it is difficult to lower the furnace temperature immediately, and so far no practical immediate method has been developed.

Therefore, the conventional method has the disadvantage of reducing productivity. In addition, although it was well known that there is a close relationship between the shape of the hearth roll and the shape of the plate being conveyed, it has been found that the shape of the hearth roll varies depending on the shape of each position in the length direction of the plate after rolling. It was considered difficult to control.

This situation is the same even when the subsequent device is a continuous plating device, and the significant meandering of the plate material in these devices hinders the connection between the rolling device and the processing device.

This invention was made to solve the above-mentioned problems in continuous plate processing equipment, and aims to provide a method that can control the meandering of a plate over a wide range with high precision. be.

That is, the present invention focuses on the fact that a continuous processing device is installed in the vicinity of a rolling mill, and the present invention has been developed to solve the problem of hearth, which was previously considered difficult in relation to the shape of the plate material after rolling and the amount of meandering of the plate material in the continuous processing device. It is possible to control the meandering of rolls, etc. by adjusting the shape of the material to be rolled, and its gist is that the cold rolling mill and continuous plate annealing equipment or continuous plating equipment and temper rolling mill are directly connected. In the line, the amount of meandering of the plate material is detected in the continuous annealing device or the continuous plating device, the shape of the plate is adjusted in the cold rolling machine so as to suppress the meandering according to the detected amount of meandering, and the adjusted plate is The purpose is to correct the shape using the temper rolling mill.

In this invention, the amount of meandering of the plate material is detected in the continuous processing device, and the shape of the plate is adjusted in accordance with the detected amount of meandering in the rolling process prior to the continuous processing so as to suppress the meandering. To detect the amount of meandering, conventionally used industrial television methods, magnetic methods, etc. are used. Adjustment of the plate shape is carried out by rolling the plate material so that the end portion on the side that is offset from the rolls is elongated to one side. When the plate shape is adjusted in this way, the plate material moves to the opposite side from the side where it is stretched one side, so that the plate material can be brought to the center of the roll. For rolling to adjust the plate shape, a rolling mill equipped with a roll bender whose work roll crown can be adjusted is used. roll crown,
Therefore, in order to accurately adjust the plate shape over a wide range, a rolling mill equipped with intermediate rolls that can adjust the rolling pressure distribution (see, for example, Japanese Patent Publication No. 19510/1983)
Alternatively, a rolling mill equipped with an intermediate sleeve (for example, see Japanese Patent Publication No. 55-4002) is used.

The change in the plate shape moves the plate in the roll axis direction to a greater extent than the inclination of the roll supporting the plate.
According to the method of the present invention, it is possible to control the meandering of the plate material with higher accuracy than the conventional method. Furthermore, by using a roll inclination means in combination with the control of the plate shape, it becomes possible to control the meandering of the plate material over a wider range.

By adopting the meandering control method of the present invention, the meandering of the plate material in the continuous processing equipment can be quickly controlled over a wide range, so the continuous processing equipment can be operated and controlled with high reliability. This made it possible to connect rolling equipment and continuous processing equipment.

Examples of the present invention will be described below.

FIG. 1 is a drawing schematically showing equipment in which the method of the present invention is implemented, in which a continuous cold rolling device 1 is followed by a continuous annealing device 3. The continuous cold rolling apparatus 1 includes a plurality of rolling mills 2, for example, four rolling mills 2 arranged in tandem. The rolling mill 2 is a rolling mill as described above in which the roll crown of the work rolls can be adjusted. The continuous annealing apparatus 3 is divided into a heating zone 5, a soaking zone 6, a cooling zone 7, and an overaging zone 8 in this order from the input side, and is equipped with loopers 4 and 9 on the input and output sides, respectively. Here, the looper is also considered as part of the continuous annealing device. A large number of hearth rolls 1 arranged vertically in a continuous annealing device 3
1 is rotationally driven and supports and guides the plate S.

The material discharged from an unwinding reel (not shown) is rolled to a desired size by a continuous cold rolling device 1 and subsequently annealed by a continuous annealing device 3. It is also possible to provide a welding machine or the like between the unwinding reel and the continuous cold rolling apparatus 1 to connect materials with different widths back and forth to perform continuous rolling.
The plate material S rolled in the continuous annealing device 3 is supported by a group of hearth rolls 11, and is pulled forward by a bridle roll (not shown) provided on the outlet side of the device.

A meandering amount detector 12 detects a deviation in the position of the plate material S supported by the hearth roll 11 with respect to the center of the roll. The meandering amount detector 12 is, for example, an industrial television camera, an optical width detector, a tension meter, etc. It is mainly provided at the front stage. The reason why the meandering amount detector 12 is provided at such a position is that correcting the deviation of the plate material S at an early stage is effective in preventing meandering.

FIG. 2 is a block diagram of a control system implementing the method of the present invention. The meandering amount a detected by the meandering amount detector is processed by the control computer 14. That is, as the meandering amount a, the control target selection unit 15 first selects the largest meandering amount a detected at each location. The selected signal b is sent to the comparator 16, where the target value d (meandering amount =
0).

The signal e from the comparison section 16 is sent to the target shape calculation section 17.
The target shape f is obtained through calculation processing. The meandering amount is determined by the plate shape (expressed by steepness), the friction coefficient between the plate and the hearth roll (depending on the plate speed), the number of hearth roll passes, the distance between the upper and lower hearth rolls,
Although it is a function of many other factors, the relationship between the amount of meandering and the plate shape is determined in advance using an actual device under required operating conditions. Figure 3 shows meandering amount w and plate shape s.
The subscript W represents the work side of the hearth roll, and the subscript D represents the drive side of the hearth roll. The plate shape s represents one-sided elongation in terms of steepness. In the figure, a portion indicated by the symbol D indicates a portion corresponding to a dead zone in the control system.

On the other hand, the shape of the plate material S rolled on the exit side of the continuous cold rolling apparatus 1 is detected by the shape detector 19. As the shape detector 19, a known detector using a differential tension method, for example, is used. The shape g detected by the shape detector 19 is sent to the comparison section 18, where it is compared with the signal f from the target shape calculation section 17 and subjected to feedback control.

The control operation signal h from the comparator 18 is sent to the controller 20. The roll bending force of the rolling mill 2 or the position of the intermediate roll is adjusted according to the operation amount i from the controller 20 to give the work roll a required roll crown. Then, the plate material S is rolled into a shape that reduces the meandering amount. For example, if the plate material S being threaded is deviated to the work side of the hearth roll and meandered, the shape shown in Figure 3 can be corrected by correcting the shape so that the edge elongates on the drive side of the hearth roll in the rolling mill. The meandering is corrected based on the relationship between the shape of the plate shown and the amount of meandering.

In controlling the amount of meandering, if the amount of meandering is smaller than a certain value, use the conventional method as described above, for example, by tilting the hearth roll to control the amount of meandering, and if the amount exceeds the above value, use the method of the present invention. If applied, meandering can be controlled over a wide range with high precision. Additionally, if the amount of meandering becomes extremely large and cannot be controlled using these methods, for example, if the steepness must be set to 3% or more (as shown by point K in Figure 3), work efficiency will decrease. is the line speed (the forward speed of the plate material)
The amount of meandering can be reduced by reducing the amount of meandering. In FIG. 2, the signal c from the control object selection unit 15 is sent to a drive control device (not shown) for hearth rolls, bridle rolls, etc. in the above case, and reduces the rotational speed of these rolls to increase the line speed. It is something to be dropped.

Furthermore, by applying learning control to the control system, the amount of meandering can be controlled with even higher accuracy. That is, as shown in FIG. 2, the shape signal (j(t-
l/v)) is input to the target shape calculating section 17, where the response of the meandering amount to the plate shape is checked.
Then, based on the results, the meandering amount is controlled while modifying the functional relationship shown in FIG. Here, l
is the length of the plate material from the rolling mill to the meandering amount detection position,
v is the line speed and t is the rolling time.

Note that even if the plate shape is adjusted to control the amount of meandering, the plate shape of the final product will not be impaired. This is due to the fact that the shape is slightly modified due to the tension acting on the plate material while it is being processed in the continuous annealing equipment, and that it is lightly rolled by the temper rolling mill installed on the exit side of the continuous annealing equipment. by.

In the above embodiment, the continuous processing apparatus is an annealing apparatus, but the present invention can also be applied to other apparatuses that continuously process plate materials while supporting and guiding them with a plurality of rolls, such as a continuous plating apparatus.

The present invention provides the following effects. (1) If the cold rolling mill and continuous processing equipment are two separate processes, the plate material after passing through the cold rolling machine is once rolled up, then unwound and enters the continuous processing equipment before it begins to meander. However, the drawback that the meandering cannot be corrected until the processing of one coil is completed is solved. (2) In a direct-coupling process, if a problem occurs in the subsequent process, the previous process will also have to be stopped, but by controlling the meandering of the plate material, the direct-coupling process can operate stably, dramatically improving productivity. (3) Defects in the shape of the plate material that occur in the cold rolling mill are corrected in the subsequent temper rolling mill.

[Brief explanation of the drawing]

Fig. 1 shows an example of equipment to which the method of the present invention is applied, and is a diagram schematically showing the equipment consisting of a rolling machine and an annealing machine, and Fig. 2 shows a control system for implementing the method of the present invention. A block diagram showing one example and FIG. 3 are graphs showing the relationship between the amount of meandering and the plate shape. DESCRIPTION OF SYMBOLS 1... Continuous cold rolling device, 2... Rolling machine, 3... Continuous annealing device, 11... Hearth roll, 12... Meandering amount detection device, 14... Control computer, 19... Shape detector, 20... Controller, S... Plate material .

Claims (1)

[Claims] 1. In a line in which a cold rolling mill and a continuous annealing device for sheet materials or a continuous plating device and a temper rolling mill are directly connected, the amount of meandering of the sheet material is detected in the continuous annealing device or the continuous plating device, and the meandering amount is adjusted to the detected amount of meandering. A meandering control method in a continuous processing apparatus for plate materials, characterized in that the shape of the plate is adjusted by the cold rolling mill so as to suppress meandering accordingly, and the adjusted shape of the plate is corrected by the temper rolling mill.