JPH0381004A - Five-high rolling mill, multiple roll mill, skin pass rolling mill and rolling method of multiple roll mill - Google Patents

Abstract

PURPOSE:To improve a surface quality and to constrain the edge wrinkle of the plate width end by forming the barrel length of an intermediate roll larger than the maximum plate width of a rolled stock and providing a bending device at the respective roll ends of upper and lower work rolls and the intermediate roll. CONSTITUTION:In a five-high rolling mill equipped with an intermediate roll 5, the barrel length of the intermediate roll 5 is formed larger than the maxi mum plate width of a rolled stock, 1st roll bending device 10, 11 and 12 are provided at the respective roll ends of upper and lower work rolls 1, 2 and a 2nd roll bending device 13 is provided at the roll end of the intermediate roll 5. Since the roll bending action is effected on the intermediate roll 5 over its roll whole body thereby, the rolled stock is adjustable at its plate thickness as well over it whole plate width. Consequently, the surface quality of the rolled stock can be improved because of its multiple shape control capacity being excellent, the unrolling part of the plate width end vicinity is reduced and the generation of the edge wrinkle can be constrained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-high rolling mill in which the number of upper and lower rolls of rolled material is different, and is particularly suitable for adjustment rolling or aluminum rolling.
The present invention relates to a high rolling mill, a multi-high rolling mill, an adjustment rolling mill, and a rolling method for a multi-high rolling mill.

[Conventional technology]

In general, a temper rolling mill, which is an example of a rolling mill with a small rolling reduction and rolling load, has traditionally been equipped with bending devices on upper and lower work rolls, as shown in Japanese Patent Application Laid-Open No. 48-22344. Four-high rolling mills equipped with supporting upper and lower reinforcing rolls are often used.

However, the shape control ability of this four-high rolling mill was not sufficient, and work rolls with a large number of clarans were alternately used to cope with the problem. Therefore, the special public official
A six-high rolling mill with a large shape control ability as shown in Japanese Patent No. 84 has been proposed. This six-high rolling mill has upper and lower intermediate rolls arranged between upper and lower work rolls of equal diameter and two lower reinforcing rolls 3 and 4, and a roll bending device is attached to each of the work rolls and intermediate rolls. Both bending devices have the ability to control composite shapes. In this 6-high rolling mill, in the case of light rolling such as in a temper rolling mill, unrolled parts remain at the width edges of the rolled material, and therefore it is insufficient to suppress the occurrence of selvage wrinkles at the width edges of the rolled material. There was a problem.

By the way, as a conventional multi-high rolling mill in which the number of upper and lower roll pairs of rolled material is different, especially a 5-high rolling mill, the Japanese Patent Publication No. 62-46
There are rolling mills disclosed in Japanese Patent Publication No. 245 and Japanese Patent Publication No. 60-48242, but these five-high rolling mills use small diameter rolls as upper work rolls in order to obtain a large rolling reduction with a small rolling load. The premise is that the mill is a 5-high rolling mill equipped with upper and lower work rolls of different diameters. and 5
In order to make full use of the plate crown control ability of the corrugated rolling mill, bending devices are installed on both the intermediate roll and the large-diameter lower work roll, making it possible to control the plate crown from simple concavity to convexity over the entire width of the rolled material. That is.

However, i) rolling where both the rolling reduction and the rolling load are small;
ii) Excellent plate shape control capable of complex shape control, and
i) In the case of a rolling mill that requires the suppression of edge wrinkles at the edge of the sheet width, such as a temper rolling mill, if the upper and lower work rolls have different diameters as in the above-mentioned 5-high rolling mill, the surface of the work roll will be roughened. There are problems in that the life of the dull roll becomes extremely short, or the rolled material tends to warp. Furthermore, since the work rolls have a small diameter, there is a problem in that cross buckling or squeezing is likely to occur during rolling.

Furthermore, as a five-high rolling mill in which upper and lower work rolls have the same diameter, Japanese Patent Laid-Open No. 54-39349 and Japanese Patent Publication No. 53-3478
Japanese Patent No. 9 discloses a five-high rolling mill in which upper and lower work rolls of equal diameter are provided with a bending device, and an intermediate roll having the same body length as the width of the rolled material is provided.

However, in this five-high rolling mill, the intermediate roll must be replaced every time the width of the rolled material is changed.

Since the rolling operation is stopped each time, it is extremely unproductive and cannot be put to practical use. In particular, in the case of a temper rolling mill installed in a continuous annealing line, rolled materials of different strip widths are continuously supplied, so the above five-high rolling mill cannot be used for practical use at the side bottom. do not have.

Further, Japanese Patent Application Laid-Open No. 56-151103 discloses a five-high rolling mill in which upper and lower work rolls have the same diameter, and each of the upper and lower work rolls and a small-diameter intermediate roll is provided with a bending device. However, in this 5-high rolling mill, the intermediate roll has a small diameter and is in contact with the reinforcing roll and the work roll over the entire length of the roll, so the control characteristics of the intermediate roll bending are similar to those of the upper work roll. Therefore, there is a problem in that it is basically impossible to realize both complex shape control and control to suppress edge wrinkles at the edge of the sheet width.

[Problem to be solved by the invention]

All of the above-mentioned conventional techniques are intended to improve the shape modification ability, but they do not satisfy the performance that requires low rolling reduction and rolling load and excellent surface quality, such as in temper rolling, for example. .

That is, the characteristics of temper rolling are listed as examples: i) The rolling reduction is several percent or less, and the rolling load is less than half that of normal cold rolling.

ii) A dull roll with a roughened surface is often used for one work roll in order to give the product a satin finish.

m) Since the material to be rolled after annealing is rolled, if an unrolled portion is formed at the width end of the material, surface roughness (edge wrinkles) will occur due to stretcher strain.

K) In many cases, final products are produced immediately after temper rolling, and a plate shape with excellent surface quality is required.

Based on the above characteristics, we will discuss the characteristics required for a skin pass rolling mill.

First, considering the diameter of the work roll, the work roll must have a relatively large diameter in order to prevent cross buckling and squeezing during temper rolling. In addition, from the viewpoint of the life of the dull of one work roll and prevention of sheet warping after temper rolling, it is desirable that the work rolls have the same diameter on the top and bottom (in practice, the same diameter).

When considering shape control of a rolled material to obtain a plate shape with excellent surface quality, a complex shape control ability that corrects both edge elongation and mid-elongation is required.

The last important thing is to reduce the edge width of the unrolled portion at the width end of the sheet. Since this edge crease is removed in a subsequent process as a defective part, reducing the width of the edge crease has a significant effect on improving yield.

The above is a summary of the characteristics of a rolling mill that are desirable for temper rolling.

1) The work roll must have a practically equal diameter and a relatively large diameter.

2) Two types of control means with different control characteristics are required for complex shape control that achieves excellent surface quality.

3) In order to reduce ear wrinkles, a third control means other than the above composite shape control means is required.

The first object of the present invention is to provide a five-high rolling mill that can realize a plate shape with excellent surface quality even under light rolling reduction and light rolling load, and can suppress edge wrinkles at the width edges of the plate. be.

The second object of the present invention is to provide a multi-high rolling mill capable of suppressing defects such as cross buckling during light reduction rolling, exhibiting the ability to control the composite shape of rolled material, and suppressing edge wrinkles at the edge of the sheet width. The purpose is to propose the following.

The third and third object of the present invention is to provide a skin pass rolling mill that has a compact structure, realizes a plate shape with excellent surface quality, and can suppress the occurrence of edge wrinkles at the width edges of the plate.

A fourth object of the present invention is to provide a rolling method using a multi-high rolling mill that can exert the ability to control the composite shape of a rolled material during light reduction rolling and suppress the occurrence of edge wrinkles at the width edges of the strip. .

[Means to solve the problem]

In the first invention, the above-mentioned object is a five-high rolling mill equipped with an intermediate roll having a diameter larger than the upper and lower work rolls and smaller in diameter than the upper and lower reinforcing rolls, which are approximately the same, and the body length of the intermediate roll is the same as that of the rolled material. This is achieved by forming the roll bending device to be larger than the maximum width of the upper and lower work rolls, providing a first roll bending device at each roll end of the upper and lower work rolls, and providing a second roll bending device at the roll end of the intermediate roll.

In addition, as a means for improving the roll bending effect in order to obtain a rolled material with better surface quality, it is preferable that the reinforcing roll that directly supports the intermediate roll has a contact length with the intermediate roll that is equal to or less than the body length of the intermediate roll. or the reinforcing roll that directly supports the intermediate roll is formed so that its contact length with the intermediate roll is greater than the minimum plate width of the rolled material and smaller than its maximum plate width; Alternatively, the intermediate roll bending device and the work roll bending device supported by the intermediate roll are provided with at least an increase bender mechanism, and the work roll bending device directly supported by the reinforcing roll is provided with at least a decrease bender mechanism. By doing so, the bending effect can be increased and achieved.

In the second invention, the above object is a multi-high rolling mill in which upper and lower work rolls of approximately equal diameter are supported by different numbers of support rolls, and the number of roll pairs is different between the second part and the lower part of the rolled material, A mathematical formula expressing the degree of change in the plate crown of a rolled material that can be adjusted by a roll bending device provided on a support roll that directly supports the work roll constituting the pair of rolls with a larger number of rolls. A certain control order is configured to be different between the upper and lower roll pairs.

Each work roll of the pair of upper and lower rolls is provided with a roll bending device, and the order of control of the plate crown that can be adjusted by each roll bending device is also different for the upper and lower work rolls, and the order of control by each roll bending device is The value of is set so that it gradually increases in the following order: the support roll that makes up one roll pair that has a larger number of rolls, the work roll that also makes up one roll pair, and the work roll that makes up the other roll pair that has a smaller number of rolls. achieved by doing.

In the third invention, the above object is a rolling mill that is provided with an intermediate roll on either one of the upper and lower work rolls and the upper and lower reinforcing rolls, each having a large diameter and approximately the same diameter. A roll bending device is provided at the roll end of the intermediate roll, and a roll bending device is also provided at each roll end of the upper and lower work rolls. This is achieved by equipping the roll bending device for the lower work roll with at least a decrease bender function to configure a skin pass rolling mill.

In the fourth invention, the above-mentioned object is to provide upper and lower work rolls having approximately equal diameters, upper and lower reinforcing rolls that respectively support the work rolls, and intermediate work rolls disposed between either the upper or lower work roll and the reinforcing roll. In a multi-high rolling mill equipped with rolls, the rolled material is rolled by operating both the roll bending device installed on the intermediate roll and the roll bending device installed on the work roll on the opposite side of the roll where the intermediate roll is installed. Adjust the composite plate crown over the entire plate width, and operate the roll bending device provided on the work roll that is directly supported by the reinforcing roll to adjust the plate crown at the plate width end of the rolled material, thereby This is achieved by configuring the rolling method of the multi-high rolling mill to control both the composite shape of the rolled material and the unrolled width of the strip width end.

[Effect]

In the first invention, in a five-high rolling mill equipped with intermediate rolls, the body length of the intermediate roll is larger than the maximum width of the rolled material, and a first roll is provided at each roll end of the upper and lower work rolls. By providing a bending device and a second roll bending device at the roll end of the intermediate roll, the roll bending action extends over the entire length of the intermediate roll, so that the rolled material is also rolled over its entire width. Thickness can be adjusted. Further, since roll bending acts near the roll end of one of the work rolls in contact with the intermediate roll, the width of the rolled material can also be adjusted near the end of the plate. By combining these two types of roll bending actions, composite plate-like control of the rolled material can be realized, making it possible to roll a plate shape with excellent surface quality even under light rolling and light normal rolling loads. Furthermore, since the other work roll that is not in direct contact with the intermediate roll has a large roll bending effect on the roll end, it is possible to reliably roll the width end of the rolled material, resulting in creases on the width end of the sheet. A rolling mill that can suppress this will be realized.

Further, in the second invention, in a multi-high rolling mill configured such that the number of roll pairs is different between the upper and lower parts of the rolled material, the work rolls constituting the roll pair with a larger number of rolls are directly supported. *71i is a mathematical formula that expresses the degree of change in the temporary crown of a rolled material that can be adjusted by a roll bending device provided on a support roll that is
The first order is configured to be different between the upper and lower roll pairs, and each work roll of the upper and lower roll pairs is provided with a roll bending device, so that the control order of the sheet crown that can be adjusted by each roll bending device is also different between the upper and lower work rolls. The control order value of each roll bending device is configured to be different, and the value of the control order by each of the roll bending devices is the support roll constituting one roll pair with a larger number of rolls, the work roll of one roll pair, and the other one with a smaller number of rolls. Since the work rolls constituting the roll pair are set to gradually increase in size, the bending action of the support roll with the smallest control order adjusts the bending of the support roll over its entire length, and the rolled material The thickness of the entire board width can be adjusted.

In addition, due to the bending action of one of the work rolls with the next highest control order and the largest number of rolls, the vicinity of the end of the work roll is bent and adjusted, making it possible to adjust the thickness of the rolled material in the vicinity of the width end of the rolled material. The combination of two types of roll bending actions with different orders fully exhibits the composite shape control ability of the rolled material, and also makes it possible to suppress the occurrence of defects such as cross buckling even during light reduction rolling. Furthermore, due to the bending action of the other work roll, which has the lowest number of rolls with the highest control order, the end of the work roll is largely bent and adjusted, and the thickness of the width end of the rolled material is sufficiently adjusted and the thickness of the end of the sheet is reduced. Since the number of rolled parts is reduced, it is possible to suppress the occurrence of edge wrinkles at the width ends of the plate.

In other words, the above effects can be achieved by appropriately combining three types of roll bending actions each having a different order of control.

Further, in the third invention, in a rolling mill equipped with an intermediate roll formed to have a diameter larger than that of one work roll, the body length of the intermediate roll is set to be longer than the maximum plate width of the rolled material and shorter than the body length of the work roll. A roll bending device is provided at the roll end of the intermediate roll, a roll bending device is also provided at each roll end of the upper and lower work rolls, and the roll bending device of the lower work roll is provided with at least a decrease bender function. Since the contact length of the intermediate roll with the reinforcing roll is greatly reduced, the rolling load acting on the intermediate roll from the end of the reinforcing roll is reduced. Since the bending action of the roll greatly adjusts the bending of the intermediate roll over the entire length of the roll, the thickness of the rolled material is also adjusted over the entire width of the sheet. In addition, since the upper work roll that is in direct contact with this intermediate roll has a short body length, the roll bending action is more effectively applied to the vicinity of the roll end of the work roll, and the roll bending action is more effectively applied to the vicinity of the width of the rolled material. Thickness is adjusted. Therefore, by combining these two types of roll bending actions, it is possible to control the shape of the composite plate of the rolled material, so that skin pass rolling with excellent surface quality can be achieved. Furthermore, since the lower work roll is equipped with a roll bending device equipped with a decrease bending function, rolling can be carried out by effectively utilizing the decrease bending action that greatly bends the end of the lower work roll toward the rolled material. It is possible to roll the width end portion of the material, thereby reducing the unrolled portion at the width end of the rolled material, thereby realizing a temper rolling mill that can sufficiently suppress the occurrence of edge wrinkles.

Further, in a fourth invention, in a multi-high rolling mill equipped with intermediate rolls, a roll bending device provided on the intermediate roll, and a roll bending device provided on a work roll on the opposite side of the roll on which the intermediate roll is provided. and to adjust the crown of the composite plate over the entire width of the rolled material, and by operating the roll bending device provided on the work roll that is directly supported by the reinforcing roll, the edge of the width of the rolled material is adjusted. The rolling method is configured to control the composite shape of the rolled material as well as the unrolled width at the ends of the rolled material by adjusting the crown of the strip at the end of the strip. By appropriately combining the bending action of an intermediate roll that can adjust the bending over the entire length, and the bending action of the work roll on the opposite side of the roll on which the intermediate roll is installed, which can adjust the bending near the end of the roll, the rolling material can be Since the thickness of the plate can be freely adjusted over the entire width of the plate, a rolling method that can exert the ability to control the composite shape of the rolled material even during light reduction rolling can be realized. The bending action of the work roll on the rolling side greatly bends the end of the work roll, effectively adjusting the plate thickness at the width end of the rolled material and reducing the unrolled width. This makes it possible to realize a rolling method that can sufficiently suppress the occurrence of edge wrinkles.

〔Example〕

Before explaining the present invention in detail, the principle of the rolling mill according to the present invention will be explained.

The present invention aims to realize a multi-high rolling mill that has excellent ability to control complex shapes to improve the surface quality of rolled materials and can suppress edge wrinkles at the edge of the width of the strip. In this method, a roll bending device is used for a multi-stage rolled material in which an intermediate roll whose body length is larger than the maximum sheet width of the rolled material is provided between either one of the upper and lower work rolls having approximately the same diameter and a reinforcing roll. They are provided on the upper and lower work rolls and the intermediate roll, respectively, and the control characteristics for changing the plate crown of the rolled material by these roll bending devices are configured to have different properties.

The intermediate roll bender and the work roll bender on the side with the intermediate roll mainly control the composite shape of the rolled material.
By improving the surface quality of the rolled material and controlling the unrolled width at the edge of the rolled material using the work roll bender on the side without intermediate rolls, the unrolled area at the edge of the strip can be significantly reduced, resulting in less selvage. It is something that can restrain me.

The rolling mill according to the present invention has three types of roll benders: an intermediate roll bender, a work roll bender on the side with the intermediate roll (hereinafter referred to as the 6H side), and a work roll bender on the side without the intermediate roll (hereinafter referred to as the 4H side). A work role vendor exists;
Each of these has a different order of shape control in the characteristics for adjusting the plate crown of the rolled material, and it is possible to control the edge width as well as the composite shape control. For example, the diameter of the work roll is 4-7511w1, which is a typical roll size for a temper rolling mill. Intermediate roll diameter 53
Table 1 shows the calculation of the control order of each bender for a 5-high rolling mill with a diameter of 011W, a reinforcing roll diameter of 1000 mm, a roll surface length of each roll of 2050 am, and a plate width of 1880 wn.

Table 1 Control order by roll bending In Case 1, case 1 represents the control order when only the roll bender of the work roll on the 4H side directly supported by the reinforcing roll acts, and case 2 shows the control order when the work roll is supported by the intermediate roll. Case 3 represents the control order when only the roll bender of the work roll on the 6H side acts, Case 3 represents the M order when only this intermediate roll acts, and Case 4 represents the control order when only the roll bender of the work roll on the 6H side acts.
This represents the average control order when both J(side and 6H@ work roll benders are applied).

In the above coating 1, the work roll bender on the 4H side that constitutes the 5-high rolling mill is in contact with the reinforcing roll, which has extremely high bending rigidity, over its entire length, so its effect is difficult to reach the center of the strip width, and the control order is high. Become. On the other hand, the work roll bender on the 6H side is more effective in producing sheets with medium widths due to the presence of intermediate rolls, and its control order is lower than on the 4H side. The intermediate roll bender essentially operates at the center of the sheet width and therefore has the lowest control order.

Here, we will consider errors in shape control, that is, shape defects.

Considering the case where the shape disturbance Xβ is controlled by one type of bender having order m, the error after shape correction is expressed by the following equation.

y=xβ-ax" Here, the coefficient a can be changed by the bender force, but the order m remains unchanged.Even if the bender force is optimally selected, that is, the coefficient a is optimized, unless β=m in this case, the above y does not become zero over the entire plate width, and an error remains as shown in Fig. 9. In this case, there are extreme values at two locations, and if these are designated as δl and δ2, the maximum value δ can be found by the following equation.

Similarly, when the shape disturbance Xβ is controlled by two types of benders having orders of m and n, the error after shape control is expressed by the following equation (FIG. 10).

y=xβ−(a x”+b x”) Here, the coefficients a and b can be changed depending on the bender force. Even if the bending force is optimally selected as before, β= m
, or an error remains unless β=n.

In this case, there are three extreme values, and the maximum value δ is determined by the following equation.

When there are two types of vendors, the error is significantly smaller than when one type of vendor is used for control. Table 2 shows this numerically.

Table 2 Error in shape control For example, when the second-order disturbance is controlled with one type of 2.2-order, the error is 2.6%, and when this is controlled with 1.8- and 2.2-order, the error is 0. .16% (1/16.3 of 2.6%
) and become very small.

Next, consider a case where there are two types of shape disturbances, that is, orders of βl and β2, and these are controlled by two types of control means m and n. In this case, it is not necessary to control the disturbance of βl with order m and the disturbance of β2 with order n, and it is sufficient to control the disturbance as follows. In other words, the disturbance of β1 is controlled by orders m and n, and this error is reduced to δ
^, and the disturbance of β2 is controlled with the same orders m and n. Let this error be δB, and this is possible if the vendor has the ability. Therefore, δ^=max(xβt-(atx”+b1xrl))δ
B=IIIax(xβz−(azx"+bzx")), and the total shape defect (= error) is δ=δ^+δB, but since each error δ^ and δB are very small, the total shape In the rolling mill according to the present invention, as described above, there are three types of benders with mutually different control orders, for example, in the above example, the intermediate roll bender has a control order of 1.8.

The work roll bender on the 6H side can perform 2.2-order control, and the work roll bender on the 4H side can perform 2.8-order control. Therefore, the composite shape control and the selvedge width control can be performed simultaneously. Ideally, the intermediate roll bender and the work roll bender on the 6H side would control the composite shape of the rolled material, and the work roll bender on the 4H side would control the edge width at the edge of the width of the rolled material. In reality, if the work roll bender on the 4H side is applied, the shape will be disturbed, so it is necessary to slightly change the bender force of the intermediate roll bender and the work roll bender on the 6H side.

Table 3 shows the simulation results regarding the relationship between bender force and shape.
By changing from to 1001.

It can be seen how the unrolled portion at the width end of the rolled material can be changed. In this case, the bending forces of the intermediate roll bender and the work roll bender on the 6H side are slightly different so as not to disturb the shape of the central part of the sheet width.

As described above, according to the five-high rolling mill according to the present invention, the width of the edge wrinkle can be made very small while maintaining the shape of the rolled material well. This was not possible with a conventional five-high rolling mill.

What is important here is that it is desirable that the control orders m and n be as different as possible; that is, the work roll bender on the 4H side has a high order value, for example, close to 3rd order, and the intermediate roll bender order has a low order value of 2 Next, it is appropriate to use the value of the nearest b11th order, and for the work roll bender on the 6H side, the value of the solidification of each order of the work roll bender on the 4H side and the intermediate roll bender, for example, the value of the second order, which is close to the first order.

In order for this to be true, the intermediate roll needs to have a larger diameter than the work roll. This control order m.

The fact that the values of n are close to each other means that there is no difference from the case of one type of vendor, and therefore, a large shape defect occurs.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rolling mill according to an embodiment of the present invention will be explained below with reference to the construction drawings, FIG. 2, and FIG. 3. In the figure, numerals 1 and 2 indicate upper and lower work rolls, the diameters of which are set to approximately the same value. 3 and 4 are upper and lower reinforcing rolls, and 5 is an intermediate roll, one of which is a work roll.A guard is provided between the work roll 1 and the upper reinforcing roll 3. Project block 1 that guides the bearing box 7 of the upper work roll 1 on the 6H side
At 7, there is a bending cylinder 10 for the upper work roll 1.

Also, in the same project block 17 that guides the bearing box 8 of the lower work roll 2, there is an increase bending cylinder 11 for the lower work roll 2. and day grease bending cylinders 12 are provided, and these bending cylinders 10, 11, 12 apply a pending force to each bearing box 7, 8 of the upper and lower work rolls 1, 2, and the 5 work rolls are 0 by controlling the deflection of 1 and 2
Ru.

Further, the intermediate roll 5 has a structure in which a bending cylinder 13 installed on a project block 19 that guides the bearing box 9 applies a pending force to the bearing box 9, thereby bending the intermediate roll 5.

By configuring a 5-high rolling mill with the above structure.

Due to the presence of the intermediate roll, the bending action of the upper work roll 1 on the 6H side extends only to the vicinity of the end of the work roll 1. Therefore, the bending action of the upper work roll 1 on the 6H side extends only to the vicinity of the end of the work roll 1. Therefore, the vicinity of the end of the work roll is axially bent, and the plate at the width end of the rolled material is bent. It becomes possible to adjust the thickness. Further, the bending action of the intermediate roll 5 extends over the entire length of the roll, and therefore, by adjusting the axial deflection over the entire length of the roll via the work roll 1, it is possible to adjust the dependent thickness over the entire width of the rolled material. Become. Therefore, by appropriately combining these two types of roll bending actions, composite plate-like control of the rolled material can be realized, allowing for light rolling.

This makes it possible to roll a plate shape with excellent surface quality even under light rolling loads.

On the other hand, the bending action of the lower work roll 2 on the 4H side is
It does not reach the center of the lower work roll, and the axial deflection at the end of the work roll is largely adjusted, so that the unrolled part at the width end of the rolled material can be rolled effectively. It is possible to suppress the wrinkles in the ears.

In particular, for the unrolled portion at the width end of the plate in temper rolling, the day fleece bender 12 is a roll bending device provided on the work roll 2 on the 4H side.

By bending only the width end of the work roll 2 toward the rolled material and pressing it against the surface of the sheet, the unrolled portion at the width end of the rolled material is significantly reduced, and edge wrinkles are suppressed (see Figure 11). .

That is, the rolling method in the multi-high rolling mill according to the present invention will be explained as follows.

That is, the upper and lower work rolls 1, 2 having approximately the same diameter, the upper and lower reinforcing rolls 3.4 that support the work rolls 1, 2, respectively, and the space between either the upper or lower work rolls 1, 2 and the reinforcing rolls 3, 4. In a rolling method of a multi-high rolling mill equipped with an intermediate roll 5 arranged in Roll bending equipment W11
A roll bending device provided on the work roll 2 which is directly supported by the reinforcing roll 4 and which adjusts the crown of the composite plate over the entire width of the rolled material 6 by operating both the 0 and 0! 11 to adjust the plate crown at the plate width end of the rolled material 6, thereby controlling both the composite shape of the rolled material and the unrolled width at the plate width end. Therefore, an intermediate roll bending action that allows bending adjustment over the entire length of the roll, and a work roll on the opposite side of the roll on which the intermediate roll, which has different control characteristics and that allows bending adjustment near the roll end, are provided. By applying and combining the bending action, the thickness of the rolled material can be freely adjusted over the entire width of the material, so it is possible to realize a rolling method that can exert the ability to control the composite shape of the rolled material even during light reduction rolling. It is. Furthermore, by the roll bending action of the work roll 2 directly supported by the reinforcing roll 4, the end of the work roll 2 is largely bent and adjusted, and the thickness of the width end of the rolled material 6 is effectively adjusted. Since the unrolled width is reduced, it is possible to realize a rolling method that can sufficiently suppress the edge wrinkles that occur at the width edges of the rolled material.

By the way, in the above description of the rolling mill, the work roll bender 10 and the intermediate roll bender 13 on the 6H side are only increased, but when the shape disturbance is large, for example, the rolling load is large, or the change in the plate crown is large. Needless to say, in such cases, this can be dealt with by providing a de-fleece bender in addition to the increase bender to widen the control range of deflection. As shown in the figure, the effective trunk length of the reinforcing roll 3 on the 6H side is made smaller than the maximum width of the rolled material.

That is, in FIG. 5, if the effective trunk length and maximum plate width Bmax of the reinforcing roll 4 on the 417 side are the effective trunk length a of the reinforcing roll 3 on the 6H side, then L>Bmax>a, or the reinforcing roll 4 By attaching an appropriate high-order roll crown to the 6H side, the bending effect of the work roll 1 and the intermediate roll 5 on the 6H side can be expanded without changing the control order.

Further, the trunk length 2 of the intermediate roll 5 is formed to be larger than the maximum plate width Bax of the rolled material 6, and the intermediate roll 5
If the reinforcing roll 3 that directly supports the intermediate roll 5 is formed so that its contact length with the intermediate roll 5 is larger than the minimum plate width B win of the rolled material and smaller than its maximum plate width B wax, the reinforcing roll 3 directly supports the work roll and the intermediate roll 5. The roll bending effect of both rolls can be expanded without changing the control order.

Next, the rolling mill according to the present invention can also be expressed as follows. In other words, upper and lower work rolls 1 and 2 having approximately the same diameter, and support rolls with different numbers of rolls that support each of the work rolls 1 and 2, respectively, are provided so that the number of roll pairs is different between the upper and lower parts of the rolled material. A multi-high rolling mill configured,
A roll bending device 13 is provided on the support roll 5 that directly supports the work roll t constituting the roll pair with the larger number of rolls, and the degree of change in the plate crown of the rolled material that can be adjusted by the roll bending device 13. The upper and lower roll pairs are configured to have different control orders, which are mathematical expressions representing The control order of the plate crown, which can be adjusted, is also configured to be different between the upper and lower work rolls 1 and 2, and the value of the control order by each roll bending device 13, 10, 11 is the same as that of the one with the larger number of rolls. This is a multi-high rolling mill in which the support rolls 5 constituting a roll pair, the work rolls 1 of one roll pair, and the work rolls 2 constituting the other roll pair with a smaller number of rolls are set to gradually increase in size in this order.

In the above control order, as shown in Table 1, the value of the control order by each roll bending device is a first order value close to second order for the support roll 5 constituting one roll pair with a larger number of rolls, e.g. 1.8 Neighborhood value Similarly, work roll 1 of one roll pair has a quadratic value close to linear, for example 2.
Three different control orders are set, such that the work roll 2 constituting the other roll pair with a smaller number of rolls is set to a second-order value close to third order, for example, a value near 2.8. An important requirement is to have a control means that has the following characteristics.

Another example of expanding the effect of roll bending in the rolling mill of the present invention is to increase the body length of the roll 5 in the middle of the 6H side as much as possible within a range greater than the maximum width of the rolled material 6, as shown in FIGS. 6 and 7. The idea is to make it smaller. In other words, reducing the surface length of the intermediate roll 5 eliminates contact with the large-diameter reinforcing roll 3 at the end of the roll, which increases not only the bender effect of the intermediate roll 5 on the 6H side but also the bender effect of the upper work roll 1. I will do it. The reason for making it larger than the maximum board width is because
If the surface length of the intermediate roll is smaller than the plate width, the surface roughness of one work roll will change between the contact and non-contact areas of the intermediate roll.
This is because the roughness of the plate surface changes as a result, impairing the surface quality of the plate. This is especially true when the work roll is a dull roll.

As described above, in the 5-high rolling mill of the present invention, the characteristics of the 6-high rolling mill where the roll bending action is easily effective up to the center of the strip width, and the characteristics of the 4-high rolling mill where the roll bending action is easy to be effective at the edges of the strip width. It is possible to provide a multi-high rolling mill that can provide diversity in the control of deflection of work rolls, has good shape controllability, and has few edge wrinkles.

In addition, the effective trunk length of the reinforcing roll on the 6H side of the rolling mill according to the present invention is made smaller than that of the intermediate roll, or the 5-high rolling mill with a relatively large roll crown is attached to the reinforcing roll under rolling conditions with a large rolling load. In the case of application, it is convenient to oscillate the intermediate roll with a stroke of about ±ioam, since it is possible to prevent the eyebrow mark of the reinforcing roll from being transferred to the board.

Although the above explanation was made regarding a temper rolling mill, if the rolling mill of the present invention is applied to a rolling mill for non-ferrous metals such as copper and aluminum with a small rolling load, a wide range of complex shape control can be achieved and the effect can be improved. It's big.

〔Effect of the invention〕

According to the present invention, since the composite shape control ability is excellent, the surface quality of the rolled material can be significantly improved, and the occurrence of edge wrinkles can be suppressed by reducing the unrolled portion near the width edge of the sheet. A rolling mill has become possible, and its effects are significant.

[Brief explanation of drawings]

The construction drawing is a schematic configuration diagram showing a partially sectional view of an embodiment of a five-high rolling mill of the present invention, FIG. 2 is a partial sectional view thereof, and FIG. A schematic configuration diagram, FIG. 4 is an approximate m8M diagram showing a partial cross section of a rolling mill which is another embodiment of the present invention, and FIGS. 5(A) and (B)
6 and 7 are schematic diagrams showing a rolling mill according to still other embodiments of the present invention, respectively, and FIG. 8 is a schematic diagram showing a rolling mill according to still other embodiments of the present invention. Figure 5 shows the power curve of
FIG. 1 is a diagram showing the state of the unrolled portion at the width end of the sheet. 1... Upper work roll, 2... Lower work roll, 3...
- Upper reinforcing roll, 4... Lower reinforcing roll, 5... Intermediate roll, 10... Work roll bending cylinder,
11... Increase bending cylinder, 12.
Day-free suspending cylinder, 13... Intermediate port - Fig. 1 Fig. Fig. l Fig. Fig. (4) Fig. 6 Fig. P' Fig. 0

Claims (1)

[Claims] 1. Upper and lower work rolls having approximately the same diameter, and upper and lower reinforcing rolls that support the upper and lower work rolls and have a larger diameter than the work rolls;
In a five-high rolling mill equipped with an intermediate roll disposed between either an upper or lower work roll and a reinforcing roll and having a diameter larger than that of the work roll and smaller than that of the reinforcing roll, the body length of the intermediate roll is equal to that of the rolled material. The roll bending device is formed to have a larger amplitude than the maximum amplitude, and is characterized in that a first roll bending device is provided at each roll end of the upper and lower work rolls, and a second roll bending device is provided at the roll end of the intermediate roll. corrugated rolling machine. 2. Upper and lower work rolls having approximately the same diameter, and upper and lower reinforcing rolls that support the upper and lower work rolls and have a larger diameter than the work rolls;
In a five-high rolling mill equipped with an intermediate roll disposed between either an upper or lower work roll and a reinforcing roll, the body length of the intermediate roll is formed to be larger than the maximum amplitude of the rolled material, and the intermediate roll is The reinforcing roll that is directly supported is formed so that its contact length with the intermediate roll is shorter than the body length of the intermediate roll, and a first roll bending device is provided at each roll end of the upper and lower work rolls, and A 5-high rolling mill characterized in that a second roll bending device is provided at the end of the intermediate roll. 3.Equipped with upper and lower work rolls of approximately equal diameter, upper and lower reinforcing rolls that support the upper and lower work rolls and have a larger diameter than the work rolls, and an intermediate roll disposed between the upper work roll and the upper reinforcing roll. In the five-high rolling mill, a first roll bending device and a second roll bending device are provided at the roll ends of the upper work roll and the lower work roll, respectively, and a third roll bending device is provided at the roll end of the intermediate roll. , a first roll bending device provided on the upper work roll and a third roll bending device provided on the intermediate roll are provided with a common increase bender mechanism; and a second roll bending device provided on the lower work roll. A 5-high rolling mill characterized in that it is equipped with a co-day crease bender mechanism. 4. The five-high rolling mill according to claim 3, wherein the first to third roll bending devices are configured to be able to operate individually. 5. Upper and lower work rolls of approximately equal diameter, upper and lower reinforcing rolls that support the upper and lower work rolls and have a larger diameter than the work rolls, and an intermediate roll disposed between either the upper or lower work roll and the reinforcing roll. In the five-high rolling mill equipped with the above, the body length of the intermediate roll is formed to be larger than the maximum plate width of the rolled material, and the reinforcing roll that directly supports the intermediate roll has a contact length with the intermediate roll that is the minimum width of the rolled material. The roll bending device is formed to be larger than the sheet width and smaller than the maximum sheet width, and first and second roll bending devices are provided at the roll ends of the upper work roll and the lower work roll, respectively, and the roll bending devices are formed so as to be larger than the sheet width and smaller than the maximum sheet width. A five-high rolling mill characterized in that a third roll bending device is provided at the top. 6. In a multi-high rolling mill configured to have upper and lower work rolls of approximately equal diameter and support rolls with different numbers of rolls supporting each of the work rolls, so that the number of roll pairs differs between the upper and lower parts of the rolled material. , a mathematical formula expressing the degree of change in the plate crown of a rolled material that can be adjusted by a roll bending device provided on a support roll that directly supports the work roll constituting the pair of rolls with a larger number of rolls. The upper and lower roll pairs are configured to have different control orders, and each work roll of the upper and lower roll pairs is provided with a roll bending device, so that the control order of the sheet crown that can be adjusted by each roll bending device is also different for the upper and lower work rolls. The control order value of each roll bending device is configured to be different for each roll, and the value of the control order by each roll bending device is the support roll constituting one roll pair with a larger number of rolls, the work roll of the same roll pair, and the work roll with a smaller number of rolls. A multi-high rolling mill characterized in that the work rolls constituting the other pair of rolls are set to gradually increase in size in the order of the work rolls. 7. The value of the control order by each roll bending device is such that the support roll constituting one roll pair with the larger number of rolls has a first order value close to second order, and similarly the work roll of one roll pair has a first order value The work rolls constituting the other pair of rolls with fewer rolls are close to tertiary 2.
A multi-high rolling mill characterized in that the following values are set respectively. 8. Upper and lower work rolls with a large diameter and approximately the same diameter, upper and lower reinforcing rolls that respectively support the work rolls, and disposed between the upper work roll and the upper reinforcing roll, and the roll diameter between these rolls. In a rolling mill equipped with an intermediate roll, the intermediate roll has a body length longer than the maximum sheet width of the rolled material and shorter than the body length of the work roll, and roll bending is performed at the roll end of the intermediate roll. 5-stage temper rolling, characterized in that a roll bending device is also provided at each roll end of the upper and lower work rolls, and the roll bending device of the lower work roll is equipped with at least a decrease bender function. Machine. 9. The two-stage temper rolling mill according to claim 8, wherein the roll diameter of the upper and lower work rolls is set to 450 mm or more. 10. The five-high adjustable rolling mill according to claim 8, wherein the upper reinforcing roll that directly supports the intermediate roll has a body length shorter than that of the intermediate roll. 11. A multi-stage rolling mill equipped with upper and lower work rolls having approximately the same diameter, upper and lower reinforcing rolls that respectively support the work rolls, and an intermediate roll disposed between either the upper or lower work roll and the reinforcing roll, The composite plate crown over the entire amplitude of the rolled material is adjusted by operating both the roll bending device provided on the intermediate roll and the roll bending device provided on the work roll on the opposite side of the roll on which this intermediate roll is provided. , the roll bending device provided on the work roll directly supported by the reinforcing roll is operated to adjust the plate crown at the width end of the rolled material, thereby controlling the composite shape of the rolled material and A rolling method using a multi-high rolling mill characterized by controlling both the unrolled width of the strip width end. 12. The rolling method using a multi-high rolling mill according to claim 11, wherein the roll bending device is operated during rolling with a light reduction amount and under a light rolling load.