JPS62156009A - Apparatus and method for controlling shape of cold rolled steel sheet - Google Patents

Abstract

PURPOSE:To easily correct the shape of sheets having any intricate shapes with a titled apparatus in which thermal and mechanical control means are used in combination by making selective control according to the region where the output signal of a shape detector enters the region of the above-mentioned control means. CONSTITUTION:Cooling water injection nozzles 3, 4 are provided near the front and rear surfaces of the steel sheet 2 to be rolled by a rolling section consisting of work, intermediate shift, and back up rolls 1a, 1b, 1c on the inlet side of said sheet 2 and the transverse shape detector 5 for the sheet 2 is provided on the outlet side. Either of the regions A2, A4 where the shape detection signal 5a from the detector 5 enters is discriminated in the discrimination part of an automatic shape control part 6. The sheet has an intricate shape if the signal 5a does not enter the above-mentioned region. A spot cooling operation is then executed in a cooling water flow rate control part 7. Work roll bending and intermediate roll shifting are started (symbol 6c) and the shape control of the sheet 2 is executed when the signal enters the above-mentioned region (symbol 6b).

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a shape control device and method for cold-rolled steel sheets,
In particular, the present invention relates to a novel improvement for uniformizing the shape in the width direction of the plate by selectively using mechanical control means and thermal control means in accordance with a shape detection signal.

b. Conventional technology Conventionally, the means to control the shape of thin sheet products in the width direction include work roll benders, moving intermediate rolls in six-stage mills, and changing the crown near the center of the silo barrel by hydraulic pressure as in vO flow. Mechanical control means, such as mechanical crowns of work rolls, and thermal control means for controlling the flow rate of cooling water injection nozzles have been put into practice.

In general, mechanical control means are very effective in modifying shapes such as simple mid-length extensions and ear waves, but they are not very effective for complex shapes where mid-length extensions and ear waves occur together, or local extensions. The possibility of thermal control is attracting attention for modifying shapes such as complex shapes and local elongation.

Under the above-mentioned circumstances, as shown in FIG.
There is one disclosed in Japanese Patent No. 27708.

That is, cooling water injection nozzles 3 and 4 are arranged on the inlet and outlet sides of the steel plate 2 passing between the roll parts 1, and the shape detector 5
The control unit 7 calculates the difference between this detected shape and a preset target shape, and calculates the absolute value of the difference at each position in the width direction of the workpiece. While calculating the amount of operation of each machine and machine so that The intersection points between this reference value and the predicted shape are calculated, and the areas where the predicted shape is larger than the reference value are found between each intersection sequentially from one plate edge, and the difference between the predicted shape and the reference value in each area is calculated. The nozzle flow rate corresponding to the position with the maximum value is maximized, and the nozzle flow rate corresponding to the position with a lower value is determined by multiplying the maximum flow rate by a coefficient of 1 or less depending on the shape of the cooling water injection nozzle. This method was designed to control the flow rate.

In addition, as another method, a combination of thermal control means and mechanical control means has been used on a trial basis.

Problems to be Solved by the C0 Invention Since the conventional steel plate shape control method is configured as described above, firstly, in the former case, a large number of cooling water injection nozzle groups with variable flow rates are required; In order to predict the shape, extremely complicated prediction calculations and complicated and delicate control of the amount of coolant ejected are required.In order to actually perform such control, a large-capacity control electric circuit device, This required complicated adjustment work after setting, resulting in an extremely high cost.

In addition, sufficient monitoring is required for after-care after setting, which increases maintenance costs. In addition, in the case of the latter method, since there is no appropriate control means between the thermal control area and the mechanical control area, a nching phenomenon occurs due to reciprocation between the thermal control area and the mechanical control area, making it impossible to effectively control the shape. .

It is an object of the present invention to promptly solve the above-mentioned problems and to provide an apparatus and method for extremely simple and highly accurate shape control by using both mechanical control means and thermal control means. shall be.

Means for Solving Problem d1 The shape control device for a cold rolled steel plate according to the present invention includes a rolling mill comprising a plurality of rolls for cold rolling a steel plate, and a cooling water disposed near the steel plate. an injection nozzle, a shape detector disposed on the exit side of the roll for detecting the shape of the steel sheet in the width direction, a cooling water flow rate control section connected to the cooling water injection nozzle, and the shape an automatic shape control section connected to a detector, wherein the automatic shape control section selectively controls the operation of the cooling water injection nozzle or the roll according to the output signal of the shape detector, and The configuration is such that the shape in the board width direction is controlled to be a predetermined shape. In addition, in another invention, a method for controlling the shape of a cold-rolled steel sheet, a cooling water injection nozzle is disposed near the steel sheet rolled by a roll, and the shape of the steel sheet in the width direction is detected on the exit side of the roll. In a cold rolling mill equipped with a shape detector, a step of comparing and determining an output signal from the shape detector with a thermal control region pattern and a mechanical control region pattern stored in advance in an automatic shape control section; This method includes the steps of controlling the operation of the roll using an output signal from the automatic shape control section, and controlling the flow rate to the cooling water injection nozzle using the output signal from the automatic shape control section.

00 action The output signal from the shape detector is compared with the thermal control area pattern and the mechanical control area pattern stored in advance in the automatic shape control section to determine whether the output signal is within the thermal control area pattern. If there is, perform shape control with thermal control means and check that it enters the mechanical control area pattern,
When this output signal enters the mechanical control area pattern, the shape control is performed by the mechanical control means to make the shape in the width direction of the board uniform.

f. Examples Hereinafter, preferred embodiments of the apparatus and method for controlling the shape of a cold-rolled steel sheet according to the present invention will be described in detail with reference to the drawings.

1 to 6 are for illustrating a shape control device and method for a cold rolled steel sheet according to the present invention. In the shape control device shown in FIG. , WR), a pair of intermediate shift rolls 1
b (hereinafter referred to as ■MR) and backup roll 1c
In FIG. 1, only one rolling mill is shown for simplicity. Cooling water injection nozzles 6 and 4 for performing spot cooling are disposed on the inlet side of the steel plate 20 rolled by the roll part 1 at positions close to the front and back sides of the steel plate 20. A shape detector 5 for detecting the shape of the steel plate 2 in the width direction is disposed on the exit side.

The shape detection signal 5a, which is the output of the shape detector 5, is input to the A2 and A4 determination section 6aVC of the automatic shape side m section 6,
It is determined whether the shape detection signal 5a falls into the area A2 or A4. The above-mentioned A2 and A4 are parameters representing the shape of the rolled steel plate, and the spot cooling control range and the existing ASC! shown in FIG.
(Automatic shape control) This is an element that serves as basic data for determining the control/range, and has already been proposed and is well known. That is, A2 represents the extension of the plate end portion of the steel plate 2, and A4 represents the extension of the plate width at an arbitrary point in the plate width direction (plate width X-, l).The relationship between the extensions of A2 and A4 is When 1A41<1,421, the plate shape shows a simple elongated shape or a shape close to an ear wave.Furthermore, when the shape detection signal 5a does not fall within the above-mentioned region, the plate shape is complex. The spot cooling operation is performed by the cooling water flow rate control unit 7, and when the above-mentioned region is entered (indicated by reference numeral 6b), the work roll pend and intermediate roll shift, which are the existing ASO controls, are performed. Start (code 6c
) to control the shape of the steel plate 2.

The configuration shown in FIG. 2 shows the main parts of the configuration shown in FIG. 1 more specifically, and a tank 9 in which cooling water 8 is stored is provided with a pump 1o. The cooling water 8 is connected to a number of spot cooling parts 33 to 3e (through the first valve 11, the second valve 12, and the third valve 16), and the control signal 7a of the cooling water flow rate control part 7 is transmitted to the Kishu 11. .12 and 16, these valves 11-13
By performing individual opening/closing control, it is possible to control the injection flow rates of the spot cooling parts 6a to 3e.

Next, a specific method for controlling the shape of the steel plate 2 based on the above configuration will be described using FIGS. 3 to 6.

In addition, in this embodiment, the spot cooling section 6 of 5 zones
The case of spot cooling system control using a to 6e will be explained.

In step 1 in FIG. 3, the shape detector 5 captures 712 and /14 in order to recognize shape parameters. In step 2, in order to determine the control range of the cooling spot based on this detection signal, l,/
141>1421X (A is a value appropriately determined by each control capability of the mechanical control means and the thermal control means) and
A: +A', ) B (B is the value that determines the control dead band area)
It is determined which range of the SC control range (mechanical control means) the data belongs to.The control range shown in FIG. 4 is the spot cooling control range where the dotted area is the thermal control range. 14, the white area is the existing ASC control range 15 which is the mechanical control area.In other words, in the A4 direction indicated by the vertical axis in FIG. A complex shape, which is a complex state in the ear in which the two occur at the same time, is shown in a schematic diagram, and furthermore, in the A2 direction, a simple shape in the middle and an ear wave are shown in a schematic diagram.

Therefore, if the above-mentioned determination is in the 11G state at the stage of step 2, it is determined that the board has a simple shape and the existing A
It is determined that it is within the SO control range, and mechanical control means such as WR bending and mechanical MR shift are performed, and the plate shape is mechanically controlled. In other words, the existing ASO control range 1 in Fig. 4
It is 5.

In addition, if the determination in step 2 is OK, it is determined that the plate shape is complicated, and in step 3, the flow rate is calculated for the deviation of A2, and in step 4, the flow rate is calculated for the deviation of A4. After that, in step 5, the plate shape and pattern of spot cooling selection zones are selected as shown in FIG. That is,
As the pattern is shown in FIG. 5, the relationship between the spot cooling selection zone and the shape parameter is shown, and the five spot cooling sections 15a to 1
5e, DS, -DS, CENTER
, -yes, and WS are set, and the number of selected zones and the number of non-selected zones are set according to each shape parameter.

After the selected zone is determined using one of the patterns in step 5 described above, the flow rate of each selected zone is calculated in step 6, the flow rate of each non-selected zone is calculated in step 7, and the flow rate of each non-selected zone is calculated in step 6. In step 8, the total flow rate of each zone is calculated. Further, in step 9, board width correction is performed for the flow rate of both end zones, and the spot cooling flow rate output of each zone from Ql to Q5, that is, the spot cooling parts 13a to 13e described above, is accordingly adjusted to the operation in step 9 described above. Based on each spot cooling part 162L~1
3e, when the shape of the steel plate 2 is detected by the shape detector 5, A2 and A4 are the second
If the step conditions are not satisfied, it is determined that the plate shape has changed from a complex shape to a simple shape, and the existing ASC control, which is a mechanical control means, is performed.

Furthermore, the characteristic diagram shown in Fig. 6 shows the online sterilization state of the spot cooling system using four rolling mills, and shows the ear waves, middle rolls, and
A2 and A4 are detected for the quarter buckle and ear/inside, and at the same time, each cooling hole) 13a-13
The opening degrees of the six valves are controlled for e, and the WR bending operation is shown, and at the stage of the fourth rolling mill, the spot cooling operation, which is a thermal control means, is almost completed, and the mechanical control It has been found that only the WR bending operation can be achieved by means.

g1 Effects of the invention The cold rolled steel sheet shape control device and method according to the invention are as follows:
With the above configuration, process, and operation, the output signal detected by the shape detector installed on the exit side of the rolling mill is judged, and if the plate shape is a composite shape, thermal control is performed. The coolant that is the means is injected, and the output signal is 1.1
After confirming that 41 < 1 "121 With this, it is possible to very easily correct a plate of any composite shape, and the hardware configuration of the control system is also simplified, resulting in effects such as being able to significantly reduce all costs.

[Brief explanation of drawings]

1 to 6 are for illustrating the shape control device and method for cold-rolled steel sheets according to the present invention. FIG. 1 is a block diagram showing the overall configuration of the device, and FIG. A configuration diagram showing the main parts in detail, FIG. 3 is a flow diagram showing the steps as a method for performing spot cooling control and mechanical control,
Figure 4 is an explanatory diagram showing the range of spot cooling control and existing ASC control, Figure 5 is a pattern diagram showing the relationship between the plate shape and spot cooling selection zone, and Figure 6 is a waveform configuration diagram showing the online control state. , FIG. 7 is a block diagram showing a conventional device. 1 arm-roll part, 1a...work roll, 1b...intermediate shift roll, 1C...backup roll, 2...preparation, 6, 4...cooling water injection nozzle, 5...shape detector, 6 . . . automatic shape control section; 7. . . cooling water flow rate control section. Figure 1 6c 6b Figure 4 Figure 5-1 Non-remains 2

Claims (4)

[Claims] (1) A rolling mill consisting of a plurality of rolls for cold rolling a steel plate, a cooling water injection nozzle disposed near the steel plate, and a cooling water injection nozzle disposed on the exit side of the roll for rolling the steel plate. A shape detector for detecting the shape in the board width direction, a cooling water flow rate control section connected to the cooling water injection nozzle, and an automatic shape control section connected to the shape detector; A configuration in which the automatic shape control section selectively controls the operation of the cooling water injection nozzle or the roll according to the output signal of the detector, so that the shape of the steel sheet in the width direction is controlled to be a predetermined shape. A shape control device for a cold-rolled steel sheet, characterized by: (2) A comparison pattern for specifying the output signal from the shape detector is stored in the automatic shape control section, and the output signal is a required simple shape signal or a required complex shape signal. The shape control device for a cold-rolled steel sheet according to claim 1, characterized in that the device is configured to determine whether or not the shape of a cold-rolled steel sheet exists. (3) In a cold rolling machine in which a cooling water injection nozzle is arranged near the steel plate being rolled by the rolls, and a shape detector is installed on the roll exit side to detect the shape of the steel plate in the width direction. , a step of comparing and determining an output signal from the shape detector with a thermal control region pattern and a mechanical control region pattern stored in advance as comparison patterns in an automatic shape control section; and an output signal from the automatic shape control section. A method for controlling the shape of a cold-rolled steel sheet, comprising the steps of: controlling the operation of the rolls according to the automatic shape control section; and controlling the flow rate to the cooling water injection nozzle using an output signal from the automatic shape control section. (4) a step of determining that the output signal from the shape detector is a simple shape signal and activating the roll by determining that the pattern is the mechanical control region pattern; and a step in which the output signal from the shape detector is a complex shape Claim 3, further comprising the step of determining that the pattern is the thermal control region pattern if the pattern is a signal, controlling the cooling water injection nozzle, and then operating the roll. The method for controlling the shape of a cold-rolled steel sheet.