KR0144670B1 - Five high rolling mill, multi high rolling mill skinpass rolling mill, and rolling method of multi-high rolling mill - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a five-stage rolling mill capable of realizing a plate shape with excellent surface quality even under a light reduction rate and a light rolling load, and preventing end wrinkles at the plate width end. A mutual work roll having a top and bottom work rolls, a top and bottom reinforcement roll having a diameter larger than the diameter of the work rolls, and a work roll of any one of the top and bottom reinforcement rolls and the reinforcement rolls, and having a diameter of the work rolls. And a middle roll having a larger diameter and having a diameter smaller than that of the reinforcing roll, wherein the middle roll has a drum length greater than the maximum plate width of the rolled material, and a work roll banding device is provided at each roll end of the upper and lower working rolls. Is provided, the roll end of the intermediate roll is to be provided with an intermediate roll bending device.

Description

Rolling method of 5-stage rolling mill, multi-stage rolling mill, temper rolling mill and multi-stage rolling mill

1 is a fracture front view showing a five-stage rolling mill according to an embodiment of the present invention

Figure 2 is a broken side view showing an embodiment of a five-stage rolling mill

3 is a schematic diagram showing the operating conditions of the bending force

Figure 4 is a fracture front view showing a five-stage rolling mill according to another embodiment of the present invention

5a and 5b is a schematic view showing a five-stage rolling mill according to another embodiment of the present invention

6 and 7 are broken front and schematic views showing a five-stage rolling mill.

8 is a graph showing the curve of the X value for any force

9 and 10 are diagrams showing the characteristics of the control error (defect) controlled by the roll bending operation.

11 is a diagram showing the side end conditions of the unrolled sheet width.

The present invention relates to a multi-stage rolling machine having a different number of rolls in the upper and lower portions of the rolled material, and in particular, a five-stage rolling mill, a multistage rolling mill, a rolling mill and a multistage rolling mill suitable for skinpass rolling or aluminum rolling. It is about.

In general, a rolling mill having a low rolling rate and a small rolling load, such as a temper rolling mill, includes a top and bottom work roll with a banding device and a top and bottom reinforcement roll supporting the work roll, as disclosed in Japanese Patent Application Laid-Open No. 48-22344. However, many rolling mills have been used conventionally.

Since such four-stage mills do not have sufficient shape control capability, this lack of capability must be compensated for by multiple work rolls with various crowns.

For this reason, a six-stage rolling mill with excellent shape control capability has been proposed and put into practical use (see Japanese Patent Office 57-55484). In this six-stage rolling mill, upper and lower intermediate rolls are installed between the upper and lower work rolls of the same diameter and the upper and lower reinforcement rolls, and roll bending devices are installed on the upper and lower work rolls and the upper and lower intermediate rolls. Can provide great power. In the case of temper rolling with a small reduction ratio, the six-stage rolling mill has a side end portion of the rolling material that remains unrolled, resulting in end wrinkles at the side ends of the rolling material, and there is a problem in that the formation of such end wrinkles cannot be prevented properly. .

Conventional multistage rolling mills (particularly conventional five-stage rolling mills) in which the upper and lower portions of the rolled material have different roll numbers are disclosed in Japanese Laid-Open Patent Publications 60-48242 and 60-46254, respectively. Such a five-stage rolling mill includes upper and lower working rolls of different diameters and has a smaller diameter of the upper working roll. Thereby, a large rolling reduction can be obtained with a small rolling load. In addition, the banding device is installed on the middle roll and the lower diameter work roll, so that the five-stage rolling mill can control the crown of the plate. Therefore, it is possible to control the crown of the singular curved surface (凹 or 凸) throughout the width of the rolled material, thereby reducing the rolling load and consequently improve the bander effect.

On the other hand, i) in the case of both small rolling operations in which the rolling rate is small in both the reduction ratio and the rolling load, ii) in the rolling operation requiring excellent ability to control the surface of the plate so that the composite shape control is possible, iii) In the case of rolling, e.g., temper rolling, which is necessary to prevent the formation of wrinkles, the life of a roll roll having a rough surface, i.e., the work roll of the above-mentioned five-stage rolling mill including upper and lower work rolls of different diameters. This extremely short and tends to cause bad warping in the rolled material. In addition, when the diameter of the work roll is small, there is another problem that cross buckle or folding is likely to occur during the rolling operation.

Japanese Patent Laid-Open Publication No. 54-39349 and Japanese Patent Laid-Open Publication No. 53-34789 disclose a five-stage rolling machine having a banding device installed on a vertical work roll of the same diameter and having an intermediate roll having the same drum length as the sheet width of the rolled material. .

In the case of using this rolling mill, it is necessary to replace the intermediate roll with a new one every time the plate width of the rolling material is changed, and the rolling operation is stopped every time, so that the productivity of the rolling mill is considerably lowered and not practical. In particular, in the case of the temper rolling mill provided in the continuous annealing line, since the rolling materials having different plate widths are continuously supplied, the five-stage rolling mill described above is impossible to apply practically.

In addition, Japanese Laid-Open Patent Publication No. 56-15113 discloses a five-stage rolling machine in which a banding device is provided on top and bottom work rolls (same diameter) and intermediate rolls smaller in diameter than the work rolls, respectively. However, in this five-stage rolling mill, the intermediate roll has a small diameter, has the same drum length as the reinforcing roll and the work roll, and is in contact with the reinforcing roll and the work roll over the entire length of the roll, so that the control characteristics of the middle roll are the upper work. It is similar to the control characteristics of the roll, and as a result, there is a problem in that it is not possible to perform the control to realize the complex shape control and to prevent the wrinkle of the plate width end.

Although all of the conventional rolling mills described above attempt to improve the shape correcting ability, both the reduction ratio and the rolling load cannot satisfy the performance required for temper rolling, which requires small and excellent surface quality.

Examples of the characteristics of the temper rolling are as follows.

i) The reduction ratio is several percent or less and the rolling load is less than half of the usual cold rolling.

ii) Dull rolls of rough surfaces are sometimes used as work rolls, and the surface of the product is like a pear shell.

iii) If the side ends of the rolled material are not rolled, the surface nonuniformity (wrinkles at the ends) is formed due to the stretcher strain. This is because the rolled material has been previously annealed.

iv) The tempered rolled material is often the final product as it is, it is necessary to have a good surface quality. With reference to these characteristics, the condition of the rough mill is reviewed.

First, the diameter of the workpiece is to be described. It is necessary for the roll to have a relatively large diameter in order to prevent crossbuckles or folding during temper rolling. In addition, it is preferable that the upper and lower work rolls have the same diameter (actually the same diameter) from the viewpoint of preventing twisting of the plate after temper rolling and the life of the work roll.

In shape control of a rolled material for obtaining a plate material of excellent surface quality, the rolling mill needs to have a composite shape control ability to correct both the wrinkles at the ends and the buckle at the center portion.

Finally, it is very important to reduce the width of the unrolled side ends of the plate, which is the part where end pleats are formed. Since the part having the end wrinkles will be cut into the defective part in the next process, the recovery rate can be effectively improved by reducing the width of the wrinkled part.

The characteristics of the rolling mill suitable for temper rolling are as follows.

1) The work rolls are substantially the same and have a relatively large diameter.

2) Two types of control means having different control characteristics are required to realize complex shape control that provides excellent surface quality.

3) In addition to these means for complex shape control, a third means for reducing wrinkles at the end of the sheet is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a five-stage rolling machine capable of realizing a plate shape having excellent surface quality even under a small rolling rate and a small rolling load, and preventing end wrinkles at the plate width end.

It is still another object of the present invention to provide a multi-stage rolling machine which prevents defects such as cross buckles and the like during the rolling under light pressure, fully exhibits the combined shape control ability of the rolled material and prevents end wrinkles at the plate width side ends.

It is still another object of the present invention to provide a temper rolling mill which realizes a plate shape of excellent surface quality with a compact structure and prevents occurrence of end wrinkles at the side ends of the plate width.

Another object of the present invention is to provide a rolling method of a multi-stage rolling machine that exhibits the composite shape control capability of the rolled material at the time of rolling under light pressure and prevents the occurrence of end wrinkles at the plate width end.

In order to achieve the above object, the present invention has a middle roll having a diameter larger than the vertical working roll of the same diameter and smaller than the upper and lower reinforcing roll, the drum length of the intermediate roll is formed larger than the maximum width of the rolled material and the upper and lower Provided is a five-stage rolling mill provided with a first roll bending device at each roll end of the work roll and a second roll bending device at the roll end of the intermediate roll.

In one aspect of the present invention, as a means for improving the roll bending effect in order to obtain a rolled material of better surface quality, preferably the reinforcement roll that directly supports the intermediate roll is a drum of the intermediate roll has a contact length Formed to be shorter than the length, or the reinforcement rolls supporting the intermediate rolls are formed so that the contact length with the intermediate roll is larger than the minimum plate width of the rolled material and smaller than the maximum plate width, or in the banding device and the intermediate roll of the intermediate roll The banding device of the supported work roll is equipped with at least a decrease bender mechanism and the working roll banding device directly supported by a reinforcement roll has at least a decrease bander mechanism to increase the banding effect.

The present invention is also a multi-stage rolling mill having different sets of rolls at the top and bottom of the rolled material by supporting up and down work rolls of approximately the same diameter with different numbers of support rolls, and directly forming a work roll constituting a roll set having a larger number of rolls. The roll bending device is installed on the supporting roll, and the control degree indicating the degree of change of the plate crown of the rolled material which can be controlled by the roll bending device is configured to be different for each of the upper and lower roll sets. The control orders of the plate crowns that can be controlled by each roll bending device by installing roll banding devices on each work roll of the roll set are also configured so that the upper and lower work rolls are different from each other, and this control order generated by each roll bending device The values are in order of the supporting rolls that constitute the roll set with the larger number of rolls, the work rolls in the same roll set, and the work rolls that constitute the other roll set with the smaller number of rolls. Gradually and provides a multi-stage rolling mill set such that the control order to zoom.

In addition, the present invention is a rolling mill having an intermediate roll between any one of the upper and lower work rolls having approximately the same large diameter and one of the upper and lower reinforcement rolls, the drum length of the middle roll is longer than the maximum plate width of the rolling material and Shorter than the drum length, the roll bending device is installed at the edge of the middle roll, the roll bending device is installed at the roll edge of each of the upper and lower work rolls, and the roll bending device of the lower work roll has at least a decrease bander function. Provide a rough mill.

In addition, the present invention is a rolling method using a multi-stage rolling machine having an upper and lower work rolls of approximately the same diameter, and an intermediate roll disposed between one of the upper and lower occupation rolls and the reinforcement rolls. By operating both sides of the roll bending device installed on the work roll on the side of the roll set, the plate crown is controlled in combination throughout the entire width of the rolled material and installed on the work roll directly supported by the reinforcement roll. A rolling method using a multi-stage rolling mill to control the plate crown of the plate width end of the rolled material by operating the roll bending device, thereby realizing the composite shape control of the rolled material and the unrolled width control of the side end width of the rolled material. To provide.

The principle of the rolling mill of the present invention is explained.

The present invention can provide a multi-stage rolling mill excellent in the composite shape control ability to improve the surface quality of the rolled material can prevent the end wrinkles of the side end of the rolled material. To this end, the rolling mill of the present invention includes an intermediate roll between any one of the upper and lower work rolls having substantially the same diameter and the reinforcement roll, and the drum length of the intermediate roll is formed larger than the maximum plate width of the rolled material. The intermediate rolls are each provided with a roll bending device having different control characteristics for changing the plate crown of the rolled material.

According to the present invention, the intermediate roll bender and the work roll bender having the intermediate roll mainly control the complex shape of the rolled material to improve the surface quality of the rolled material, and to the other work roll in which the intermediate roll is not arranged. By controlling the unrolled side end portion of the rolled material, it is possible to significantly reduce the unrolled portion of the judging portion and to suppress the end wrinkles.

In the rolling mill of the present invention, three kinds of roll benders, that is, a middle roll bander, a work roll bender on the side where the middle roll is arranged (hereinafter referred to as 6H side) and a work roll on the side where the middle roll is not arranged (hereinafter referred to as 4H side) Vendor is installed. Since these roll benders have shape control orders so that the respective characteristics of controlling the plate crown of the rolled material are different, not only the complex shape control but also the width of the side end portions having the end wrinkles can be controlled. For example, in the case of a five-stage rolling mill having a typical roll size of a temper rolling mill, the working roll has a diameter of 475 mm, the middle roll has a diameter of 530 mm, the reinforcing roll has a diameter of 100 mm, and the roll surface of each roll has a length of 2050 mm and a plate width of 1880. In the 5-stage rolling mill of mm, the calculation results of the control orders of the respective vendors are shown in Table 1. In this case, the control order represents the change of the plate crown of the rolled material which can be controlled by the roll bending device.

Case 1 in Table 1 indicates the control order when only the roll vendor acts on the 4H work roll directly supported by the reinforcement roll, and this control order generally has a value of 2.6 to 3.3. Case 2 indicates the control order when only the roll bender acts on the 6H work roll supported by the intermediate roll, and this control order generally has a value of 2.0 to 2.5. Case 3 displays the control order when only the roll bender is acting on the intermediate roll, which generally has a value between 1.7 and 1.9. Case 4 also displays the control order when both roll venders act on the 4H side and 6H side work rolls.

As shown in Table 1, the 4H work roll bender in the case of constructing a five-stage rolling mill has a large bending stiffness and is in contact with a large reinforcing roll through the entire length, and thus its influence is hardly affected in the center of the plate width. The result is a higher degree of control. On the other hand, the 6H side roll bender is easily effective in the center of the plate width because the work roll is in contact with the middle roll, and the control order is lower than that of the 4H side bander. The intermediate roll bender will have the smallest control order since it will always have an effect in the center of the rolled material.

Shape disturbances in the temper rolling method include a change in the rolling load, a change in the plate crown and a change in the heat crown of the work roll. Among them, the change of the rolling load and the change of the plate crown become almost equal secondary curves, and the hot crown (for the crude rolling method) changes over time and shows a curve of the order of 1.8 to 2.5. As a result, complex shape control is required to obtain a desirable shape, and two types of shape control means are required for this compound formation control, and the control order is preferably in the range of 1.8 to 2.5.

Now consider the shape control error, that is, the shape defect.

When the shape disturbance x ^β is controlled by one kind of bender having the order m, the error after the shape correction can be expressed by the following equation.

Here, the coefficient a can be changed by the bander force but the order m will not be changed. Even if the bander force is not properly selected, that is, the coefficient a does not have an optimal value, if β is not equal to m, the y value will not be zero over the full width of the rolled material, so the resulting error is As indicated by the dashed lines. This error has two extreme values, and when expressed as δ ₁ and δ ₂ , the maximum value δ can be derived from the following equation.

Similarly, when shape disturbance x is controlled by two types of vendors having orders m and n, the error after shape correction is expressed by the following equation (indicated by the dotted line in FIG. 10).

In this case, the coefficients a and b can be changed by the bander force. In this way, even if the bander force is properly selected, an error remains if β is not equal to m or β is not equal to n. This error has three extremes and the maximum value δ can be derived from

From Equations (2) and (4), it can be clearly seen that the error in the case of controlling with two types of banders is significantly smaller than the error in the case of controlling with one type of banders. The numerical value is shown in Table 2.

For example, if the second disturbance is controlled by one type of vendor with a degree of 2.2, the error is 2.6%, and the error is greatly reduced to 0.16% when controlling it with two types of vendor with 1.8 and 2.2 degree. (Equivalent to 1 / 16.3 of 2.6%).

Next, the case where two types of shape disturbances having orders of β ₁ and β ₂ are controlled by two types of vendors having orders m and n will be considered. In this case, it is not necessary to necessarily control the disturbance of the order β ₁ by the vendor of order m and the disturbance of the order β ₂ by the vendor of the order n, and the following process may be performed. In other words, the disturbance of order β ₁ is controlled by a bander having orders m and n, and the error is expressed as δ _A. The disturbance of order β ₂ is also controlled by the same vendor with orders m and n. The error is expressed as δ _B. This operation can be performed if the vendors are equipped for that purpose.

In this case, the overall shape defect (that is, the error) may be expressed as δ = δ _A + δ _B , and the overall shape defect may be very small because each error δ _A and δ _B is extremely small. As described above, in the rolling mill according to the present invention, three kinds of vendors having different control orders can control each other. For example, in the above embodiment, the middle roll bender performs 1.8 orders of control, the 6H work roll bender performs 2.2 orders of control, and the 4H work roll bender performs control of 2.8 orders. Therefore, the composite shape control and the width control on the end of the corrugated side can be simultaneously performed. Ideally, the composite roll control of the rolled material is performed by the intermediate roll bender and the 6H work roll bender, and the corrugated width of the sheet width end of the rolled material is controlled by the 4H work roll bender. In practice, if the 4H side roll bender is operated, the shape will be disturbed. Therefore, it is necessary to slightly change the intermediate roll bender force and the 6H side roll bender force. Table 3 shows the simulation results for the relationship between the bander force and the shape. By changing the bending force of the 4H side work roll from -30 $ to 100 $, we can see how the unrolled end width of the rolled material changes. In this case, in order not to disturb the shape of the center part of the rolling material, the bending force of the intermediate roll and the bending force of the work roll of the 6H side are slightly changed.

As described so far, according to the five-stage rolling mill of the present invention, the width of the corrugated side end portion can be greatly reduced while maintaining the rolled material in a predetermined shape. This could not be achieved with a conventional five-stage rolling mill.

The gist of the present invention is that the control orders m and n are as different as possible, that is, the control order of the 4H side roll bender has a value of, for example, 2.6 to 3.3, and the order of the middle roll bender is intermediate to that of the 4H side roll. The value between the roll bender's is, for example, 2.0 to 2.4. In order for this relationship to hold, the intermediate roll needs to have a larger diameter than the working roll. When the control order m is close to the control order n, it is not significantly different from the effect of controlling with one type of bender, resulting in a large shape defect.

Hereinafter, a rolling mill according to an embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. Reference numerals 1 and 2 in these figures designate upper and lower work rolls configured to have approximately the same diameter. Reference numerals 3 and 4 denote upper and lower reinforcement rolls, and reference numeral 5 denotes one work roll, that is, an intermediate roll disposed between the upper work roll 1 and the upper reinforcement roll 3. An increment bending cylinder 10 for the upper work roll 1 is provided on the protruding block 17 to support the bearing box 7 of the 6H side work roll. In addition, the incline banding cylinder 11 and the decrement banding cylinder 12 for the lower work roll 2 each support the same projecting block 17 so as to support the bearing box 8 of the lower work roll 2. Is provided. These bending cylinders 10, 11 and 12 act on the bending forces of the bearing boxes 7 and 8 of the up and down work rolls 1 and 2 to control the bending order of the work rolls 1 and 2. With respect to the intermediate roll 5, the bending cylinder 13 provided in the protruding block 19 for supporting the bearing box 9 is arranged so that the bending force acts on the bearing box 9 so that the intermediate roll 5 Banding.

Since the five-stage rolling mill has the structure described above, the bending effect of the 6H side upper roll 1 reaches only near the end of the upper work roll 1 only because of the presence of the intermediate roll, and the thickness of the side end portion of the rolling material 6 is It can be controlled by bending the shaft of the work roll 1 near the end. In addition, since the bending effect of the intermediate roll 5 extends over its entire length, it is possible to control the axial banding of the intermediate roll at the entire length over the work roll 1, thereby controlling the thickness of the rolled material over the entire width. . Therefore, by combining these two kinds of roll bending effects properly, the composite shape control of the rolling material can be realized, and as a result, the rolling material having excellent surface quality can be rolled under the condition of small rolling load and small rolling rate.

On the other hand, since the bending effect of the 4H side lower work roll 2 does not reach the center of the lower work roll 2, the axial bending at the end of this work roll is greatly controlled, so that the conventional unrolled rolled material The side ends can be rolled effectively, and as a result, end wrinkles can be prevented from occurring in the side ends of the rolled material.

In particular, the decreasing bander 12 serving as a roll bending device provided on the 4H side work roll 2 allows the side ends of the work roll 2 to be bent toward the rolling material 6 and compressed to the surface of the rolling material. It is possible to significantly reduce the unrolled side ends of the rolled material 6 and consequently to prevent the formation of end wrinkles.

In the foregoing description of the rolling mill, the 6H side work roll bender 10 and the middle roll bender 13 are merely incremental benders. However, if the shape is largely disturbed, for example, when the rolling force is large or the change in the plate crown is large, the above-mentioned installation may be carried out by installing a decrease bander to expand the control range of the banding in addition to the increse bander. One shape disturbance can be handled. Furthermore, in order to raise the effect of this invention, the effective drum length of the 6H side reinforcement roll 3 is comprised so that it may be smaller than the maximum width of the rolling material 6 shown to FIG. 4, 5a and 5b. In other words, as shown in FIG. 5B, the effective drum length of the 4H side reinforcement roll 4 is indicated by L, the maximum plate width is indicated by B _max , and the effective drum length of the 6H side reinforcement roll 3 is indicated by L. If they do, they become LB _max l. Alternatively, as shown in FIG. 5A, when the reinforcement roll 4 is properly provided with a high degree of roll crown, the 6H side work roll without changing the control order of the intermediate roll 5 and the work roll 1. The banding effect of (1) and the intermediate roll 5 can be improved. When the effective drum length of the 6H side reinforcement roll becomes smaller than the length of the middle roll, or in the case of a five-stage rolling mill including the 6H side reinforcement roll with a relatively large roll crown, when the rolling conditions of a large rolling load are applied ± When the intermediate roll is vibrated with a stroke of about 10 mm, it is possible to prevent defects caused by the shoulder of the reinforcement roll from remaining in the rolled material.

The drum length of the intermediate roll 5 is larger than the maximum plate width B _max of the rolled material 6, and the reinforcement roll 3 directly supporting the intermediate roll 5 is smaller than the maximum plate width B _max of the rolled material. When formed to contact the intermediate roll 5 over a distance greater than the minimum plate width B _min of the soft material, it is possible to further extend the banding effect of the intermediate roll and the work roll without changing the control order.

The rolling mill of the present invention may be described as follows. That is, in the construction of the multi-stage rolling machine, the upper and lower work rolls 1 and 2 having almost the same diameter, a predetermined number of support rolls, and a different number of support rolls supporting the upper and lower work rolls 1 and 2, respectively. The upper and lower parts of the rolling mill with respect to the rolled material are configured to have different sets of roll sets. The roll bending device 13 is installed on the support roll 5 supporting the work roll 1 directly in a roll set having a larger number of rolls, and the upper and lower roll sets can be controlled by the roll bending device 13. It is configured to have a different control order to display the change in the order of the plate crown of the rolled material, respectively. The roll bending devices 10 and 11 are provided on the work rolls 1 and 2 of the upper and lower roll sets, respectively, so that the control order of the plate crown that can be controlled by the roll bending devices 10 and 11 is also the upper and lower work rolls ( With respect to the control orders by the roll banding devices 13, 10 and 11, which are configured differently with respect to 1 and 2), the supporting rolls 5 in a roll set having a larger number of rolls, this roll set The value of the control order is controlled to increase in the order of the work roll 1 of and the work roll 2 of the other roll set with the smaller number of rolls.

As shown in Table 1, the control order of the roll banding device for the support roll 5 of the roll set with more rolls has a value set close to 2 but smaller than 2, for example, close to 1.8. The control order of the device for the work roll 1 of the roll set is close to 2 but has a value set higher than 2, for example, approximately 2.2, and the work roll of the other roll set with a smaller number of rolls ( The control order of the apparatus for 2) is close to 3 but has a value set smaller than 3, for example close to 2.8, the rolling mill of the present invention includes three types of control means, each having a different control order. Is an important requirement.

6 and 7 show another embodiment for improving the roll bending effect of the rolling mill according to the present invention. The drum length of the 6H side intermediate roll 5 is comprised as small as possible in the range larger than the maximum plate | board width of the rolling material 6 here. In other words, when the drum length of the intermediate roll 5 is small, the end thereof does not come into contact with the reinforcing roll 3 having a large diameter, and as a result, the upper work roll as well as the effect of the bender on the intermediate roll 5 of the 6H side. Improve the effect on the vendor for (1). The reason why the drum length of the intermediate roll in this embodiment is larger than the maximum plate width is that if the drum length of the intermediate roll is smaller than the maximum plate width, the surface roughness of the work roll portion contacting the intermediate roll does not come into contact with it. This is because the roughness is different from the roughness, and as a result, the roughness of the surface of the rolled material changes, thereby damaging the surface quality of the rolled material. This is especially noticeable when the work roll is a dull roll.

In this way, the five-stage rolling mill of the present invention has the characteristics of a six-stage rolling mill in which the roll banding effect is easy to reach the center of the rolling material, and the characteristics of a four-stage rolling mill in which the roll banding effect is likely to occur at the side end of the rolling material. This is elaborately provided. Therefore, the bending control of the work roll can be varied, the shape of the rolled material can be efficiently controlled, and a multi-stage rolling mill capable of preventing the formation of end wrinkles can be provided.

The rolling method of the multi-stage rolling machine of the present invention is described below.

In this rolling method, the top and bottom work rolls 1 and 2 having substantially the same diameter, the top and bottom reinforcement rolls 3 and 4 supporting the work rolls 1 and 2, and the top and bottom work rolls 1 and 2, respectively. A multistage rolling mill consisting of an intermediate roll 5 located between one side and its reinforcing rolls 3 and 4 is used. Both of the roll bending device 13 provided on the intermediate roll 5 and the roll bending device 10 provided on the work roll on the roll set on which the intermediate roll is arranged control the composite plate crown over the entire length of the rolling material 6. The roll bending device 11 installed on the other work roll and directly supported by the related reinforcement roll acts to control the plate crown of the side end of the rolled material. In this way, the composite shape control of the rolling material is realized and the width of the unrolled side end of the rolling material is controlled. Therefore, the bending effect of the working roll and the bending control over the entire length of the roll can be performed in the roll set that can control the bending effect near the roll banding portion, that is, the intermediate roll is disposed with the respective control characteristics. By properly combining the intermediate roll banding effect, the thickness of the plate can be freely controlled over the entire width, thereby providing a rolling method that can realize the composite shape control of the rolled material even when rolling under the condition of low rolling ratio. have. Further, due to the bending effect of the work roll directly supported by the reinforcing roll, the end of the work roll is greatly banded so that the thickness of the side end portion of the rolling material 6 can be effectively controlled and the width of the unrolled portion can be reduced. As a result, it is possible to provide a rolling method that effectively prevents end wrinkles from being formed at the side ends of the rolling material.

Although the above description relates to a temper rolling mill, the rolling mill of the present invention is effective in realizing a complex shape control that can cover a wide range when the rolling force is applied to a material such as copper or aluminum except iron, with a small rolling force. You should know that

The present invention is excellent in the composite shape control ability to significantly improve the surface quality of the rolled material, to provide a rolling mill to reduce the unrolled portion near the plate side end to prevent the formation of end wrinkles, thereby bringing a great effect have.

Claims (12)

Upper and lower work rolls 1 and 2 having approximately the same diameter, and upper and lower reinforcement rolls 3 and 4 supporting the upper and lower work rolls 1 and 2 and having a diameter larger than the diameter of the work roll, and the upper and lower work rolls. An intermediate roll disposed between the work roll of any one of (1, 2) and its reinforcement roll 3 and having a diameter larger than the diameter of the work rolls 1 and 2 and smaller than the diameter of the reinforcement rolls 3 and 4; In the five-stage rolling mill including 5), the drum length of the intermediate roll 5 is larger than the maximum plate width of the rolling material 6, and the work roll banding at each roll end of the upper and lower working rolls 1, 2 Apparatus (10, 11, 12) is provided, the roll end of the intermediate roll (5) characterized in that the intermediate roll bending device (13) is provided. Upper and lower work rolls 1 and 2 having approximately the same diameter, and upper and lower reinforcement rolls 3 and 4 supporting the upper and lower work rolls and having a diameter larger than the diameter of the work rolls 1 and 2, and the upper and lower work rolls In a five-stage rolling machine comprising an intermediate roll (5) disposed between one of the working rolls (1, 2) and its reinforcing rolls (3), the drum length of the intermediate roll (5) is a rolled material (6). The reinforcement roll 3, which has a length greater than the maximum plate width, and directly supports the intermediate roll 5, contacts the intermediate roll 5 over a distance smaller than the drum length of the intermediate roll 5, Work roll bending devices 10, 11, and 12 are provided at roll ends of the upper and lower work rolls 1 and 2, and an intermediate roll bending device 13 is provided at the roll end of the middle roll 5, respectively. 5-stage rolling mill, characterized in that. Upper and lower work rolls 1 and 2 having substantially the same diameter, and upper and lower reinforcement rolls 3 and 4 supporting the upper and lower work rolls 1 and 2 and having a diameter larger than the diameter of the work rolls 1 and 2, In a five-stage rolling machine comprising an intermediate roll (5) disposed between one of the upper and lower working rolls (1, 2) and the reinforcement roll (3) thereof, the intermediate roll (5) is directly supported. First and second roll banding devices at roll ends of one of the working rolls 1 and roll ends of the other working rolls 2 of the working rolls directly supported by the reinforcing rolls 4 10, 11, and 12 are provided, respectively, and a third roll bending device 13 is provided at the roll end of the intermediate roll 5, and the first roll disposed on either one of the work rolls. The banding device 10 and the third roll banding device 13 disposed on the intermediate roll 5 are provided with at least an incremental bending mechanism, and are arranged on the other side 2 of the work rolls. The second roll banding device (11, 12) has at least a A five-stage rolling mill, characterized by comprising a crease bender mechanism. The five-stage rolling mill according to claim 3, wherein the first to third roll bending devices (10, 11, 12, 13) can be driven individually. An upper and lower work rolls having substantially the same diameter, a top and bottom reinforcement roll supporting the upper and lower work rolls, and having a diameter larger than the diameter of the work roll, and disposed between any one of the work rolls and the reinforcement rolls thereof. In a five-stage rolling mill including an intermediate roll, the drum length of the intermediate roll is greater than the maximum plate width of the rolled material, and the reinforcement rolls directly supporting the intermediate roll have a distance greater than the minimum plate width of the rolled material and the maximum plate width of the rolled material. The intermediate roll is contacted over a smaller distance, and each roll end of the upper and lower working rolls is provided with first and second roll bending devices, and a roll end of the intermediate roll is provided with a third roll bending device. 5-stage rolling mill. A multi-stage rolling machine comprising an upper and lower work rolls having substantially the same diameter and having a predetermined number of support rolls, wherein the number of roll sets included in the upper and lower parts of the rolling material of the rolling mill is different because the number of support rolls supporting the work rolls is different from each other. In multi-stage rolling mills, a roll banding device is installed on a supporting roll for directly supporting a work roll of a roll set having a larger number of rolls, and a change of the plate crown of the rolled material which can be controlled by the roll banding device. Roll banding on each of the work rolls of the top and bottom roll sets in order to make the control orders indicating the degree different from each other for the top and bottom roll sets, and to vary the control order of the plate crown for the top and bottom work rolls that can be controlled by the respective roll banding devices. By installing the device, the work roll of the side roll set with the larger number of rolls, the work roll of this roll set, the work of the other roll set with the smaller number of rolls A multistage rolling mill characterized by controlling them in such a way that the control orders gradually increase in the order of the rolls. 7. The control band of the roll banding device for the support roll of the roll set having a larger number of rolls has a value set to a value close to 2 but less than 2, wherein The control order of the roll banding device is approximated to 2 but is set to a value greater than 2, and the control order of the roll banding device to the work roll of the other roll set with the smaller number of rolls is approximated to 3, but Multistage rolling mill, characterized in that it has a value set to be small. 8. The method of claim 7, wherein the value of the control order approximating to 2 but less than 2 is set in the range of 1.7 to 1.9, and the value of the control order approximating to 2 but greater than 2 is set in the range of 2 to 2.4, Multistage rolling mill, characterized in that the value of the control order approximating to 3 but smaller than 3 is set to 2.6 or less, and if it exceeds 3, it is set to 3.3 or less. An upper and lower work rolls having substantially the same diameter, a top and bottom reinforcement roll supporting the work rolls respectively, and an intermediate roll disposed between the upper work roll and the upper reinforcement roll with a diameter between the ranges of diameters of the rolls. In the five-stage rolling machine comprising a drum length of the intermediate roll is larger than the maximum plate width of the rolled material and less than the drum length of the work roll, the roll end of the intermediate roll is provided with a roll bending device, respectively, the upper and lower A roll banding device is provided at each roll end of the work roll, and the roll banding device for the lower work roll is provided with at least a decrease banding mechanism. 10. The five-stage regulating rolling mill according to claim 9, wherein the roll diameter of the vertical work roll is set to 450 mm or less. 10. The five-stage rough rolling mill as claimed in claim 9, wherein the drum length of the reinforcing rolls directly supporting the intermediate roll is set smaller than the drum length of the intermediate roll. In the rolling method of a multi-stage rolling machine comprising an up-and-down work roll having substantially the same diameter, an up-down reinforcement roll supporting each of these work rolls, and an intermediate roll disposed between any one of the up-down work rolls and the reinforcement roll, Both the roll banding device installed on the intermediate roll and the roll banding device installed on the work roll of the roll set in which the intermediate roll is disposed are driven to control the composite plate crown of the rolled material over the entire length of the rolled material. The roll banding device installed in the work roll directly supported is driven to control the plate crown of the side end of the rolled material, thereby controlling the complex shape of the rolled material and also controlling the side end width of the unrolled rolled material. Rolling method of multi-stage rolling machine.

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