JPH0318412A - Profile control device for rolled stock - Google Patents

Abstract

PURPOSE:To enable to control continuously the profile of plate at the outlet of the rolling mill on the downstream side by varying the pattern of tension in the just neighborhood of the inlet of the rolling mill on the downstream side and varying the distribution of rolling pressure in the lateral direction of plate under rolling. CONSTITUTION:After the thickness in the lateral direction of a rolled stock 12 which is rolled with the rolling mill 112 on the downstream side is measured with a thickness meter 13, plate profile value P1 is determined with a plate profile arithmetic means 14 based on the measurement of plate thickness. After that, in an arithmetic and control means 16 for roll position, first, plate profile value P1 is compared with target profile value P0 in a profile comparison part 15 and, after the positions of changing skew rolls 17a, 17b according to the deviation are determined, the position signal is led to a control device 18 for roll position and the control signal for roll position is sent out from here. Then, when the control signal of roll position is received with a driving source, the skew rolls 17a, 17b which are divided in two are changed its position so as to be made into a reverse figure of V to the rolling mill side on the downstream side or upstream side. Thereby, the pattern of tension distribution of the stock 12 to be rolled at the inlet side of the rolling mill on the downstream side is continuously varied and the plate profile is obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a plate profile control device for a rolled material used in a rolling facility that rolls a rolled material using a plurality of rolling mills. In particular, the present invention relates to a plate profile control device for a rolled material that varies the tension distribution pattern in the width direction of the rolled material across a plurality of adjacent rolling mills to obtain a rolled material with an appropriate profile.

(Prior art) Generally, when rolling a material using a rolling mill, if all factors that affect the rolling of the material are uniformly applied in the width direction, the The thickness of the rolled material in the width direction should be constant. However, the rolled material actually obtained by rolling with a rolling mill has a convex plate crown (distribution in the width direction) in which the central part of the plate is thicker than the edge parts of the plate, as shown in FIG.

The main causes of such plate crowns are as follows.

■ Elastic strain of the roll due to the rolling force during rolling of the material to be rolled This includes elastic deformation and shear deflection of the roll due to external force, as well as strain caused by contact deformation between the roll and the material to be rolled.

■ Thermal crown of the rolling roll This occurs due to the temperature distribution of the rolling roll caused by the heat of the heated material to be rolled, heat generated by processing work to plastically deform the material, and heat generated by friction. This is because a thermal expansion distribution occurs and a difference in diameter occurs between the center and end portions of the rolling roll.

■ Wear of the rolling rolls The wear of the rolling rolls changes in a complex manner depending on not only long-term use but also the frequency of use, the material, temperature, and dimensions of the material to be rolled.

In addition, the plate crown has a close relationship with the plate shape resulting from the distribution in the plate width direction. If the rolling reduction ratio is not the predetermined rolling ratio, for example, if the rolling reduction ratio at the edge of the plate is large, or if the rolling reduction ratio at the center of the plate is large, there is a problem that shape defects called so-called edge elongation and mid-elongation occur. For example, regarding edge elongation, when the rolling reduction rate of the rolling mill is in the relationship of plate edge rolling rate> plate center rolling rate, the thickness of the edge of the rolled material in the width direction becomes thinner than the thickness of the central part. However, at this time, the elongation in the rolling direction at the edge of the plate is larger than that at the center of the plate, so the 9th
As shown in the figure, the shape of the plate end becomes uneven. FIG. 4 is a diagram when looking diagonally downward from the front, and the width of the plate appears to decrease as it moves away from the front.

t in the figure is the plate thickness.

Therefore, conventionally. When controlling the sheet crown and sheet profile as described above, the mechanical crown of the rolls is used as a method to distribute the roll gap between the two work rolls that make up the rolling mill, that is, the two rolling rolls, in the sheet width direction. A control method and a control method using coolant are used.

The former method of controlling the mechanical crown includes a method that utilizes the elastic deflection of the roll (roll bender), a method that utilizes the expansion of the roll sleeve, a method that controls the crown using a multi-segment support shaft, and a method that intersects the roll axes. is used.

On the other hand, the latter control method using coolant is a method of controlling the thermal crown of the roll by injecting cooling water from a cooling nozzle to vary the expansion of the roll at the contact portion of the roll.

However, among the above control methods, it is difficult to dynamically control the mechanical crown of the roll due to constraints such as the placement position of the bender and the shape of the roll to obtain a desired crown. In this method, a cooling liquid is injected from a cooling nozzle to achieve a predetermined roll expansion, which causes a large time delay and poor reproducibility.

Furthermore, factors related to the plate profile include the tension distribution pattern of the rolled material extending between adjacent rolling mills. Conventionally, in a normal rolling state, the profiles of rolls la (2a) and lb (2b) during rolling are in a concave decline state as shown in FIG. As shown in the figure, upstream rolling mill 1
A looper 4 is used to apply uniform tension to the material 3 to be rolled extending between the rolling mill 2 and the downstream rolling mill 2.

By the way, in the rolling equipment having the tension applying mechanism as described above, the tension distribution in the stationary part of the rolled material between the two rolling mills 1 and 2, that is, the position away from the downstream rolling mill entry side, is as follows.
As shown in (a) of the figure, the material is almost uniform in the width direction, but near the downstream rolling mill entry side
As is clear from Fig. 10, b is in a state of decline, so as shown in Fig. 11 (b), a convex tension distribution where the tension at the center of the plate width is higher than at the edge of the plate is created. It becomes. The tension distribution pattern near the downstream side of the rolling mill is determined by the roll profile and the tension distribution in the steady section.
It is affected by the rolling reduction distribution in the width direction of the rolled material during roll rolling. Incidentally, when the tension distribution pattern near the downstream side of the rolling mill becomes convex as shown in (b) in Figure 11, the rolling reduction distribution in the width direction of the plate becomes convex as shown in (c) in Figure 11. is small. It has a concave shape that becomes larger at the edge of the plate. Furthermore, in the case of the rolling reduction distribution shown in FIG. 11(c), the plate profile of the rolled material 3' on the outlet side of the downstream rolling mill is thicker at the center of the plate and thicker at the edge of the plate, as shown in FIG. 11(d). It becomes a convex crown that becomes thinner. As a result, the elongation at the edge of the plate is greater than that at the center of the plate, resulting in a rolled material with edge elongation as shown in FIG.

Conventionally, in normal rolling conditions, the tension distribution pattern on the downstream side entering the rolling mill is changed by applying an external force in the direction of arrow (A) using a roll bender to change the roll profile toward the increase side. In this way, the plate profile of the rolled material 3' on the outlet side of the downstream rolling mill is improved.

(Problem to be Solved by the Invention) However, when the roll profile is changed to the increase side using a roll bender as described above, although the shape of the rolled material on the outlet side of the downstream rolling mill can be improved, the roll bender It is difficult to control the plate so that it has a predetermined crown due to the capacity of the roll and the shape and dimensions of the roll.

The present invention has been made in view of the above-mentioned circumstances, and allows the tension distribution pattern in the width direction of the rolled material to be varied continuously and over a wide range according to the state of the plate profile of the rolled material, and allows the desired plate profile to be obtained. It is an object of the present invention to provide a plate profile control device for a rolled material that can easily obtain a rolled material of.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention continuously rolls a rolled material using a plurality of rolling mills to obtain a rolled material with a predetermined plate profile. In the plate profile control device for the rolled material obtained,
A plate in which a plate thickness gauge is placed on the outlet side of the downstream rolling mill of two adjacent rolling mills to measure the plate thickness of the rolled material in the plate width direction, and the plate profile value is calculated based on this plate thickness measurement value. A roll position calculation control means is provided which compares the plate profile value obtained by the plate profile calculation means with a preset target plate profile value and outputs a roll position control signal according to the deviation thereof. ing. Further, a skew roll divided into two in the width direction of the rolled material is disposed in contact with the lower surface of the material to be rolled extending between the two adjacent rolling mills, and the two skew rolls are divided into two in the width direction of the material.
A structure provided with a roll position control mechanism that controls the tension distribution pattern of the material to be rolled by controlling the position of the divided skew rolls on the downstream rolling mill side or the upstream rolling mill side so as to form, for example, an inverted V-shape. It's 戊.

(Function) Therefore, by taking the above measures, the present invention has the following advantages:
After measuring the plate thickness in the plate width direction of the rolled material rolled by the downstream rolling mill with a plate thickness meter, a plate profile calculation means calculates a plate profile value based on the plate thickness measurement value. After that, the roll position calculation control means first compares the plate profile value and the target plate profile value in the profile comparison section, determines the position for changing the skew roll according to the deviation, and then uses the position signal to compare the plate profile value with the target plate profile value. The control device sends a roll position control signal from there. Therefore, when the drive source that is part of the roll position control mechanism receives the roll position control signal, the skew roll divided into two parts is positioned so as to form an inverted V shape toward the downstream rolling mill or the upstream rolling mill. change. Then, by changing the position of the skew roll, the tension distribution pattern of the rolled material on the downstream rolling mill entry side changes continuously, and as a result, a desired plate profile of the rolled material can be obtained.

(Example) In describing the examples of the present invention, first, the relationship between the tension distribution pattern in the plate width direction of the material to be rolled and the plate profile will be explained. Generally, when rolling a material to be rolled, a difference in rolling pressure occurs in the width direction of the material depending on the initial crown of the roll, the profile of the material at the downstream side of the rolling mill, and the deformation resistance of the material to be rolled during rolling. The effects of the roll bender interposed therein are synergistic, and the roll profile during rolling changes from time to time. Then, the tension distribution pattern in the strip width direction immediately adjacent to the downstream rolling mill entry side changes according to this roll profile and the tension distribution in the strip width direction from the downstream rolling mill entry side to the upstream position. This means that by varying the tension distribution in the strip width direction from the downstream rolling mill entry side to the upstream position, the tension distribution pattern immediately adjacent to the downstream rolling mill entry side is changed, and the strip widthwise rolling during rolling is changed. By changing the pressure distribution, it becomes possible to continuously control the plate profile on the outlet side of the downstream rolling mill.

The present invention has been realized based on the principle described above, and one embodiment thereof will be described below with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of the apparatus of the present invention. That is, this device includes a plurality of rolling mills 1i, 112, . . .
are arranged at a predetermined interval, and each rolling mill 111, 112 . ...
The rolled material 12' is continuously rolled in the same manner as in FIG. Please note that this is for convenience of explanation.
11. of the two adjacent rolling mills 1111112 as needed. is called an upstream rolling mill, and 112 is called a downstream rolling mill.

Therefore, in the rolling equipment, the rolled material 12 rolled by the downstream rolling mill 112 is located near the outlet side of the downstream rolling mill 112.
To measure the sheet profile in the sheet width direction of
3 is placed. The plate thickness gauge 13 is, for example, a radiation thickness gauge, and the rolled material 1 moves in the direction of the arrow in the figure.
The plate thickness distribution in the plate width direction is measured while scanning at a predetermined speed in the plate width direction of 2', and this plate thickness distribution measurement value is sent to the plate profile calculating section 14. This plate profile calculation section 1
Step 4: After sequentially taking in the measured values of the plate thickness distribution in the plate width direction, the plate profile value Pl is determined using the average value of the plate thickness at the center of the plate or the plate width distribution measurements or various conventionally known methods. Reference numeral 15 denotes a profile comparison unit which compares the plate profile value P1 obtained by the plate profile calculation unit 14 with the target profile value Po, calculates the deviation ΔP”Po−P1, and sends it to the roll position calculation unit 16. Position calculation unit 1
6 calculates a position signal indicating how much to change the position of the skew roll looper 17 toward either the downstream rolling mill 112 or the upstream rolling mill 11l according to the deviation, and then introduces it into the roll position control device 18. . This roll position control device 18 sends a position control signal according to the position signal from the roll position calculation section 16 to the roll position control mechanism 20.

This roll position control mechanism 20 has two parts as shown in FIG.
Skew roll bearings 21.2 are arranged at intervals wider than the width of the rolled material 12, for example, in the direction perpendicular to the conveyance line of the rolled material 12 spanning between the rolling mills 11, 112.
1 is installed and divided into two skew rolls 17a and 1 between these two skew roll bearings 21 and 21.
7b are connected and supported by a universal joint type shaft joint 22. This skew roll bearing 21, 21
For example, a self-aligning type bearing or a structure in which the bearing itself can be rotated is used.

The shaft joint 22 is connected via a bearing (not shown) to a pedestal 24 that moves in the direction of the arrow (b) in the figure by the drive of the roll position changing hydraulic device 23. Therefore, this roll position control mechanism 20 is similar to the roll position control device 18.
For example, by receiving a position control signal input from the hydraulic device 23 and moving the arm 23a forward, as shown in FIG. 2(a).
from the illustrated position to the position illustrated in FIG. 17b to the downstream rolling mill 11
It can be set to have an inverted V-shape 1 so as to protrude in the direction of 2, or it can be set to protrude in the opposite direction.

Next, before explaining the operation of the above device, the basic principle of the device of the present invention will be explained with reference to FIGS. 3 and 4 to facilitate understanding of the device. Figure 3 shows the skew roll louver 17 with the distance from the pass line to the top surface of the skew roll louver 17, that is, the looper height H, being constant.
The solid line in the figure shows when the skew roll looper 17 has changed the position of the two rolling mills 11, 112.
The broken line in the figure shows the state in which the skew roll looper 17 is located in the center of two rolling mills 11. , 112 is moved slightly downstream from the center of the rolling mill 112.

If other rolling work conditions are the same, the position of the looper in FIG.
The tension applied to becomes larger. The reason for this is that two rolling mills 11. ．． This can be explained from the length of the rolled material 12 that spans between and between the rolling materials 112. Figure 4 shows two rolling mills 11. , 112 and the skew roll louver 17. When the length of the material to be rolled between the two rolling mills 111 and 112 is D, the following A formula like this is established.

In the above formula, X is the upstream rolling mill 11. The horizontal distance from to the skew roll louver 17, y1 is the upstream rolling mill 11
．． y2 is the distance from the skew roll looper 17 to the downstream rolling mill 112.゛Then, this equation (1) can be replaced with the following equation.

Therefore, the value obtained by adding yl and y2 in equation (2) becomes the distance D of the rolled material 12.

That is, D-y1+y2- (x"+H2)"+ ((L-x)
2+H21" = 13) Here, the upstream rolling mill 11
．． Horizontal distance Jllt from to skew roll louver 17
Differentiating with respect to x, (dD/dx) = (x2+
H2)-'+l(L-x)2+H21-'(x-L)
-(4). Therefore, from the above equation (4), the horizontal distance X and the differential value (d D / d x ) can be expressed in a relationship as shown in the table below.

? That is, when the position of the skew roll looper 17 is at the center position between both rolling mills 111 and 112, that is, x-(
2/L), the length D of the rolled material 12 is the minimum.

On the other hand, the position of the looper 17 is on the upstream side of the rolling mill 1 from the center position.
1■ Or the closer to the downstream rolling mill 112 the rolled material 1
2 is longer.

However, in the actual rolling state, the rolled material 12 located between the two rolling mills 111 and 112 is rolled between the two rolling mills 111 and 112. , 112, the relationship between the louver position and the tension acting on the rolled material 12 in the rolling state is such that when the louver height H is constant, the position of the skew roll looper 17 is The closer to the downstream rolling mill 112 from the center of the material 12, the greater the tension acting on the rolled material 12 as shown in the table above, and conversely, the farther away from the downstream rolling mill 111, the smaller the tension.

Therefore, when setting a convex tension distribution pattern that is higher at the center of the plate of the material to be rolled 12 based on the above-described principle, the apparatus of the present invention is capable of using the ski two rolls as shown in FIG. 5(a). If 17a and 17b are set in an inverted V shape so as to approach the downstream rolling mill 112 side, the tension distribution pattern acting on the rolled material 12 becomes convex as shown in FIG. 5(b),
On the other hand, when the rolled material 12 is set to have a concave shape that lowers the central part of the plate, as shown in FIG. 6(a), the skew roll 17a.
If 17b is set in an inverted V shape so as to approach the upstream rolling mill 111 side, the tension distribution pattern acting on the material to be rolled 12 can be made concave as shown in FIG. 6(b).

In addition, as mentioned above, the skew roll 17 due to the angle change
Although the distance change between a, 17b and the rolling mills 11l, 112 is slight, it effectively acts on the rolled material 12 when tension is applied, and the tension distribution pattern is continuously changed according to the angular change. Moreover, it can be easily controlled.

The operation of the apparatus of the present invention will be specifically explained below. The rolled material 12 is continuously rolled by a plurality of rolling mills 111112, . . . to form a rolled material 12' with a desired plate profile.
At this time, the plate thickness meter 13 sequentially measures the plate thickness while scanning the rolled material 12' rolled in the downstream rolling mill 112 in the plate width direction, and calculates the plate profile as the plate thickness distribution measurement value. It is sent to the calculation unit 14. Here, the plate profile calculation unit 14 calculates the average plate thickness based on the plate thickness distribution measurement value, for example, from the total plate thickness of the entire plate width, and then determines this average plate thickness as the plate profile value P1 of the rolled material 12', and determines the average plate thickness as the plate profile value P1 of the rolled material 12'. It is sent to the profile comparison section 15 of.

Since the target profile value Po has already been input to the profile comparison section 15, the target profile value Po and the plate profile value P are compared, and Δp-p. −P, The deviation ΔP with positive and negative polarities is obtained by the calculation.

Therefore, when this deviation ΔP has a value on the negative side, for example, it can be seen that the plate profile of the rolled material 12' is more convex than the desired plate profile (target plate profile value Po), and The degree of convexity can be easily determined by the magnitude of the deviation ΔP. Conversely, when the deviation ΔP has a value on the positive side, for example, it is found that the plate profile of the rolled material 12' is more concave than the desired plate profile (target plate profile value P.), and ,
The degree of concavity can be easily determined by the magnitude of the deviation ΔP.

By the way, in this device, it is determined from the deviation ΔP of the profile comparison section 15 that the central part of the plate of the rolled material 12' is thicker than the edge part of the plate, and when the plate profile is flat and uniform, In this case, the tension distribution pattern on the downstream side of the rolling mill is convex, that is, by changing the position of the skewer rolls 17a and 17b as shown in FIG. 5(a), for example, as shown in FIG. 5(b).
In addition, if the central part of the board is thinner than the end parts of the board and has a concave shape, the skew rolls 17a, 17
It is necessary to change the position of b as shown in FIG. 6(a) to obtain the tension as shown in FIG. 6(b).

Therefore, when the roll position calculation unit 16 receives the deviation Δ from the profile comparison unit 15, it calculates the louver change position (louver change distance) ΔX by performing the following calculation, for example. That is, the louver change position ΔX for generating the tension Δt (z) to make the deviation ΔP zero has the relationship ε−f(ΔX) with the strain ε. Here, since the tension σ(-Δt) is expressed as σ-E●ε-E●f(ΔX), it becomes f(ΔX)-σ/E, and the louver change position can be determined.

However, in the above formula, E is Young's modulus (elastic modulus).

After determining the looper change position ΔX as described above, this louver change position ΔX is supplied to the hydraulic system 23 via the roll position control device WL18. Then, the hydraulic device 23 controls the position of the skew rolls 17a and 17b so that they form an inverted V-shape by moving the arm 23a forward and backward by the required length according to the looper change position ΔX. 12 can be given an appropriate tension distribution pattern, and thus the rolled material 12' can have a desired plate profile.

Incidentally, FIG. 7 shows the plate profile of the rolled material 12' measured by the plate thickness gauge 13, where it is determined that the central part of the plate is thicker than the edge parts of the plate, and the rolled material 12' is defined as a flat plate profile. FIG. That is, in this case, the skew rolls 17a and 17b are moved to the downstream side so that the tension distribution pattern in the steady part of the material to be rolled 12 is high at the center of the plate and low at the edge of the plate, as shown in FIG. 7(a). Rolling mill 11
The position is changed so that it protrudes a predetermined distance to the second side. As a result, the tension distribution pattern near the downstream rolling mill 112 becomes higher at the center of the plate as shown in FIG. 7(b). As a result, the rolling reduction ratio of the rolled material after rolling by the downstream rolling mill 112 is improved to a uniform distribution as shown in FIG. 7(c), and
A rolled material 12' having a good plate profile as shown in d) can be produced.

Therefore, according to the configuration of the embodiment as described above, two rolling mills, for example 11. . Accordingly, by changing the position of the two divided skew rolls 17a and 17b to the downstream rolling mill side or the upstream rolling mill side so as to form an inverted V shape, the rolled material 12 on the downstream rolling mill side is Since the tension distribution pattern is controlled, it is possible to give an appropriate tension distribution pattern to the material to be rolled 12 according to the plate profile, and since the tension distribution pattern can be continuously varied, the plate can be rolled with high precision. You can control your profile.

In the above embodiment, the average value of the plate thickness was calculated by the plate profile calculation unit 14, but for example, the plate profile value P1 may be calculated by calculating either the plate thickness at the center, the maximum plate thickness in the entire width, or the plate thickness distribution pattern. It may also be used as Also, the position of the looper can be changed using two skew rolls 17a.
Although the connecting portion of 17b is moved, the connecting portion may be fixed and each end portion may be moved. Furthermore, although the hydraulic device 23 is used as a drive source for changing the position of the skew rolls 17a and 17b, the worm is meshed with a gear connected to the rotating shaft of the motor, and the worm is moved horizontally by the rotational drive of the motor. Alternatively, the pedestal 24 may be moved by. Also,
Skew roll divided into two 17g. 17b to form an inverted V-shape, but it may be divided into four parts to form a W-shape, for example.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As explained above, according to the present invention, the tension distribution pattern in the width direction of the rolled material can be continuously varied over a wide range according to the state of the plate profile of the rolled material, and this Accordingly, it is possible to provide a plate profile control device for a rolled material that can reliably obtain a rolled product with an appropriate plate profile.

[Brief explanation of the drawing]

1 to 7 are shown to explain embodiments of the present invention. FIG. 1 is a diagram showing the overall configuration of the device of the present invention, FIG. 2 is a plan view of the roll position control mechanism, and FIG. Figures 3 and 4 are diagrams explaining the relationship between the roll position and the length of the rolled material between both rolling mills, and Figure 5 (a) is a plane view when the skew roll is moved to the downstream rolling mill side. Figure 5 (b
) is a diagram showing the tension distribution pattern of the rolled material when the skew roll is set at the position shown in Figure 6 (a).
Figure 6(b) shows the tension distribution pattern of the rolled material when the skew roll is set in the position shown in Figure 6(a). Figure 7 is a diagram showing the tension distribution at each position when the skew roll is changed, the rolling reduction distribution of the rolled material, and the plate profile of the rolled material, and Figures 8 to 11 explain the conventional example. Figure 8 is a diagram showing the plate profile of a general rolled material after rolling, Figure 9 is a diagram showing the uneven shape that occurs at the edge of the plate due to the difference in rolling reduction in the width direction of the plate. FIG. 10 is a diagram illustrating the roll profile during rolling, and FIG. 11 is a diagram showing the tension distribution at each position in the conventional apparatus, the rolling reduction distribution of the rolled material, and the plate profile of the rolled material. 11. ,112,...rolling machine, 12...he rolled material,
12'... Rolled material, 13... Plate thickness gauge, 14... Plate profile calculation section, 15... Profile comparison section, l6
...Roll position calculation unit, 17... Skew roll looper, 17a, 17b... Skew roll, 18...
- Roll position control device, 20... Roll position control mechanism, 22... Universal joint type shaft coupling, 23.
...Hydraulic device for changing roll position, 24...Universal joint pedestal.

Claims (1)

[Scope of Claims] A plate profile control device for a rolled material that continuously rolls a rolled material using a plurality of rolling mills to obtain a rolled material with a predetermined plate profile, comprising: Among them, a plate profile calculating means for measuring the plate thickness in the plate width direction of the rolled material rolled by the downstream rolling mill and calculating a plate profile value based on this plate thickness measurement value, and a plate calculated by the plate profile calculating means. a roll position calculation control means that compares the profile value with a preset target plate profile value and outputs a roll position control signal according to the deviation; and a lower surface of the material to be rolled extending between the two adjacent rolling mills. a skew roll that is divided into a plurality of parts in the width direction of the plate in contact with the roll; and a roll position control mechanism that controls the position of the skew rolls, which varies the tension distribution pattern of the rolled material by controlling the position of the skew rolls divided into the plurality of parts, and adjusts the rolled material rolled by the downstream rolling mill to a predetermined plate. A plate profile control device for a rolled material, characterized in that it has a profile.