JPH04100612A - Rolling mill and rolling method - Google Patents

Abstract

PURPOSE:To drastically improve working efficiency by making the diameter of an upper rolling roll smaller than that of a lower rolling roll, making the diameters of both rolls unchangeable in the axial directions and arranging the backup roll supporting part large in diameter and circular in section at both ends of the backup roll outside the width of a metal plate. CONSTITUTION:The backup roll 3, the upper rolling roll 31, the lower rolling roll 32 are arranged in this order. The upper rolling roll 31 is made smaller in diameter than the lower rolling roll 32 and the diameters of both rolls 31,32 are unchangeable in the axial directions. The backup roll supporting part 3a larger in diameter than the backup roll 3 and circular in section is arranged as it is abutted freely rotatably on the utter outside wall. In this way, the profiles of the upper rolling roll and the lower rolling roll can be changed easily.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in the fields of iron and non-ferrous metal manufacturing, and relates to a rolling mill and a rolling method having a shape correction and crown correction device for plate materials such as steel plates. be.

[Prior Art] A conventional two-high rolling mill is shown in FIGS. 6 to 9. In the two-high rolling mill shown in Figs. 6 to 9, a pair of upper and lower rolling rolls 1, 2 having a crown shape (the diameter of the rolling rolls 1, 2 is large at the center and becomes smaller at both ends) are used. Both ends are rotatably supported by roll neck bearings 4.5, and a plate material 6 of a constant thickness is passed through a gap in the body of the roll at the center called a roll barrel, and rolled into a strip material 6a of a desired thickness.

During this rolling, when pressure oil is introduced from a pressure oil supply device (not shown) into the reduction cylinder 8 installed inside the housing 1o, as shown in FIG. (This is the force that tries to roll the plate material 6 inserted between the upper and lower rolling rolls 1 and 2) and the rolling force F of the plate material 6 inserted between the rolling rolls 1 and 2. Due to the reaction force R, the plate material 6 after rolling
The shape of a (strip material) is such that there is a difference (H-h) in the thickness of the strip material 6 between the end thickness h and the center thickness H of the strip material 6a, and the feed of the plate material 6 is In a cross-sectional view taken in a direction perpendicular to this direction, the top and bottom shapes of the strip material 6a are not flat.

FIG. 11 shows test results when the plate material 6 was rolled using a conventional rolling mill. Crown-shaped upper and lower rolling rolls 1
, 2 have a diameter of 860 mm, and the rolling force F of the rolling cylinder 8 is 600 tons, the profile of the rolling rolls 1 and 2 exhibits a convex deflection. The strip material 6a is rolled in a so-called corrugated shape, which is thicker and thinner at the ends.

Conventionally, various proposals have been made to prevent the strip material 6a from forming an undulating shape and to roll the strip material 6a so that its upper and lower surfaces are flat.

Some examples are briefly described below.

One method is to provide crowns on the upper and lower rolling rolls 1.2 in advance. In other words, in order to be able to calculate the deflection of the upper and lower rolls 1 and 2 in advance and to correct this deflection, if the middle parts of the upper and lower rolls 1 and 2 are made thick (and medium-high rolls), the rolling When the upper and lower rolling rolls 1.2 are deflected by the load, the upper and lower rolling rolls 1.2 on the side that contacts the plate material 6 become flat, and a strip material 6a of uniform thickness is obtained. It's called a crown.

Further, as the next method, there is a method called a roll bending method in which a roll bending rod 9 engaged with a roll bending cylinder is attached to the upper and lower roll neck bearings 4.5. This method is mainly applied to quadruple rolling mills, and changes the roll crown by forcibly bending the rolls using an external force. This method includes a work roll bending method and a backup roll bending method.

There is also a method called the VC roll method, in which oil chambers are provided in the upper and lower rolling rolls 1 and 2, and the crowns of the upper and lower rolling rolls 1 and 2 are changed by adjusting the hydraulic pressure applied thereto.

Other methods include a heat crown method in which the upper and lower rolling rolls 1.2 are partially biased and bent to change the crown, and a method in which the amount of expansion is adjusted by partially adjusting the amount of roll coolant applied.

[Problems to be Solved by the Invention] As mentioned above, in the method of attaching a crown to the roll in advance, if the rolling load is not always constant, the amount of deflection of the roll will vary, and the roll will vary in the amount of rolling. Proportionate wear is unavoidable and results are unsatisfactory.

In addition, the roll bending method is a method that is quick to respond and has a certain degree of flexibility, but because the rolling roll is restrained by the entire surface of the backup roll, it is difficult to give sufficient bending to the rolling roll, and it is difficult to Lacking ability.

Furthermore, in the VC method, rolling rolls are extremely expensive and maintenance is troublesome.

Furthermore, the heat crown method and the method of partially adjusting the amount of roll coolant applied are extremely flexible, but have a major problem of poor responsiveness.

Various conventional methods have been explained above, but as is clear from the examination of these conventional techniques, the important points in crown control are the ability to quickly respond to the ever-changing conditions of high-speed rolling, and the ability to vary over a wide range. It is important to have the ability to

However, since the crown control is strictly performed to check whether the rolled strip material 6a conforms to the desired shape, the upper and lower rolling rolls 1.
It has major drawbacks, such as the fact that it takes a lot of time to select and replace the parts.

[Means for Solving the Problems] The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and is configured to be able to respond quickly and respond to a wide range of changes in conditions. The purpose of this paper is to provide a shape control method and a crown control method in a rolling mill.

FIG. 10 is an enlarged cross-sectional view of the main parts of the machine; FIG. 10 is an exaggerated principle diagram showing the state of rolling of a plate material; and FIG. 11 is a profile relating to the control of the rolling rolls of the two-high rolling mill.

l, 31... Upper rolling roll, 2.32... Lower rolling roll, 3... Backup roll, 3a... Backup roll support part, 4...
Upper roll neck bearing, 5...Lower roll neck bearing, 6...Plate material, 6a...
Strip material, 7... Backup roll bearing, 8... Rolling cylinder, 9... Rod for roll bending, 10...
...housing, 20...rolling mill.

Patent applicant: Ube Industries, Ltd. The supporting position of the rolling roll is changed by replacing it with the roll. Further, by adjusting the amount of working fluid introduced into the roll bending cylinder, the roll pending force applied to the upper rolling roll can be adjusted as appropriate.

In this way, the shape of the rolled product plate can be easily modified, and
It is carried out quickly and the desired rolled product sheet can be obtained.

[Example] Next, the present invention will be explained in more detail with reference to an example shown in the drawings.

1 to 5 show one embodiment of the present invention, FIG. 1 is a front view of the rolling mill, FIG. 2 is a side view taken from ■-■ in FIG. 1, and FIG. Longitudinal cross-sectional view seen from ■-m, No. 4
5 and 5 show profiles related to control of rolling rolls of a rolling mill to which the present invention is applied. The configuration of the rolling mill of the present invention will be explained using FIGS. 1 to 5.

The rolling mill 20 in the present invention includes rolling rolls 31, 32,
It is composed of a backup roll 3, roll neck bearings 4 and 5, a backup roll bearing 7, a reduction cylinder 8, a roll bending rod 9, and a housing 10. Note that 6 indicates a plate material.

Reference numerals 31 and 32 indicate a pair of upper and lower rolling rolls, and the upper rolling roll 31 and the lower rolling roll 32, which have a smaller diameter than the lower rolling roll 32, are slightly spaced apart by the rolling cylinder 8 in order to roll the plate material 6 to the desired thickness. It is provided.

Reference numerals 4 and 5 are roll neck bearings for rotatably supporting the upper and lower rolling rolls 31 and 32, and both ends of the upper rolling roll 31 are installed inside a housing 10 that stands up on both sides of the rolling mill 20. It is rotatably supported by a pair of roll neck bearings 4. Further, both ends of the lower roll 32 are rotatably supported by lower roll neck bearings 5 similarly to the upper roll 1.

Next, the backup roll 3 of the present invention will be described. The backup roll 3 is rotatably supported by a pair of backup roll bearings 7 provided inside a housing 10 that stands on both sides of the rolling mill 20 . Moreover, backup roll support parts 3a having a diameter larger than that of the backup roll 3 and having a circular cross section are arranged at both ends of the backup roll 3.
It rotates while constantly coming into contact with the outer peripheral surface of 1.32.

Also, the backup roll support portion 3a is always located outside the board width! Therefore, the backup roll 3 can be freely replaced depending on the width of the board.

Row number 9 is a roll bending rod, which is installed alongside the roll neck bearing 4. During rolling, when pressure oil is supplied into the cylinder engaged with the roll bending rod 9, the roll bending rod 9 moves forward. As a result, the roll neck bearing 4 is pushed upward,
A bending moment is applied using the contact surface between the so-called backup roll support part 3a and the upper rolling roll 31 as a fulcrum, and the profile of the upper rolling roll 31 having a flat shape is corrected during rolling and becomes convex. It is configured so that it changes from a shape to a flat shape.

Reference numeral 8 denotes a reduction cylinder, and a reduction cylinder head 8a is disposed inside the reduction cylinder 8 so as to be able to move up and down by engaging with this reduction cylinder 8. During rolling, the reduction cylinder head 8a is provided with a pressure oil supply device (not shown). When pressure oil is introduced into the rolling cylinder 8, as the rolling cylinder head 8a rises, the tip of the rolling cylinder head 8a comes into contact with and presses the lower part of the roll neck bearing 4, resulting in a crown-shaped lower part rolling. The roll 32 is pushed upward and is used as a rolling force for correcting the strip material 6a.

The operation of the rolling mill configured as above will be explained.

Before rolling the plate material 6, according to the width and shape of the plate material 6,
The backup roll 3 is replaced with a backup roll 3 having a pair of backup roll support parts 3a located outside the width of the plate material 6.

When a series of preparations for the rolling mill 20 are completed, the plate material 6 is inserted between the upper rolling roll 31 and the lower rolling roll 32. When passing between the pair of upper and lower rolling rolls 31 and 32, the plate material 6 is rolled into a strip material 6a having a desired upper and lower flat surface. At this time, the shape of the strip material 6a is determined by the conventional visual inspection method, but in order to eliminate individual differences and improve inspection accuracy, a contact method using a sensor roll,
It can also be performed by a non-contact method using light or magnetism.

In order to make the shape of this strip plate material 6a a desired shape, the support position with respect to the rolling roll 31 is changed by replacing it with the backup roll 3, and the profile of the rolling roll 31 is adjusted by the pending force. (The central part of the strip material 6a is thick and both ends are thin) and elongation (the central part of the strip material 6a is thin and both ends are thick) can be prevented.

FIG. 4 and FIG. 4 show test results summarizing how the profile of the upper rolling roll 31 changes depending on the magnitude of the pending force when the plate material 6 is rolled using the rolling mill 20 of the present invention described above. It is shown in Figure 5.

Figure 4 shows a roll diameter of 600 mm and a rolling force of 600 TON.
, the distance between the back up roll support parts 3a is 1400 mm.
and set the roll pending force from OTON to 125.
The change in the profile of the upper rolling roll 31 when adjusted to TON is shown.

Figure 5 shows a roll diameter of 600 mm and a rolling force of 600 TON.
, backup roll 3. Backup roll support part 38
The figure shows changes in the profile of the upper rolling roll 31 when the distance between the rolls is set to 1600 mm and the roll pending force is adjusted from OTON to 125TON.

As is clear from FIGS. 4 and 5, according to the rolling mill 20 of the present invention, the upper rolling roll 31 is moved by the pending force and the position of the backup roll support part 3a.
It can be seen that it can be freely adjusted from convex to concave, and has an extremely wide range of shape control ability and crown control ability.

Further, when the roll bending rod 9 is moved back and forth, the case has been described in which pressure oil is used as the working fluid introduced into the roll bending cylinder, but compressed gas such as air or nitrogen gas may also be used. good.

Furthermore, an upper rolling roll 31 and a lower rolling roll 32
Although the case in which the diameters of the rolls are unchanged in the axial direction has been described, similar results can be obtained by using a crown-shaped rolling roll with a slight center height.

Alternatively, the lower rolling roll 32, the upper rolling roll 31, and the backup roll 3 may be arranged in this order from above to below the rolling mill 20.

[Effects of the Invention] As is clear from the above, according to the present invention, the backup roll, the upper rolling roll, and the lower rolling roll are arranged in this order from the top to the bottom, and the diameter of the top rolling roll is smaller than the diameter of the lower rolling roll. However, the diameter of the upper rolling roll and the diameter of the lower rolling roll remain unchanged in the axial direction, and a backup roll having a larger diameter than the backup roll and having a circular cross section is installed at both ends of the backup roll located outside the width of the plate material. By disposing the supporting part in rotatable contact with the upper outer peripheral surface of the upper rolling roll, the profiles of the upper and lower rolling rolls can be reliably, easily, and quickly controlled over a wide range, making it possible to roll and modify plate materials. can also be done easily. In addition, conventionally, a large number of rolling rolls and backup rolls with different initial crown shapes were prepared depending on the sheet width, but this is no longer necessary, and only a small number of rolling rolls and backup rolls are needed, greatly improving product cycles. do.

In addition, the rolling roll support position is changed according to the product sheet shape and sheet width, and the amount of working fluid introduced into the roll bending cylinder engaged with the roll bending rod is controlled. By using the contact surfaces of the back-up roll supports as fulcrums, the upper rolling roll is pushed upward and the lower rolling roll is pushed and bent downward, thereby making it easy to shape the profiles of the upper rolling roll and the lower rolling roll. Accordingly, rolling and modification of the plate material can be done easily and quickly. In addition, conventionally, the entire surface of the expensive backup roll was polished, but with the present invention, only the support part of the backup roll that comes into contact with the rolling roll needs to be polished.
Furthermore, if the backup roll support part is always arranged outside the board width, polishing of the backup roll support part itself becomes unnecessary, and work efficiency is greatly improved.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a front view of the rolling mill, FIG. 2 is a side view taken from ■-■ in FIG. 1, and FIG. Longitudinal cross-sectional view seen from ■-m, No. 4
5 and 5 show profiles related to control of the upper rolling roll of a rolling mill to which the present invention is applied. Furthermore, FIGS. 6 to 11 show conventional examples similar to the present invention, in which FIG. 6 is a front view of a two-high rolling mill, FIG. 7 is a side view taken from ■-■ in FIG. Figure 8 is a longitudinal sectional view taken from ■-■ in Figure 6, and Figure 9 is a rolling view taken from IX-IX in Figure 7, that is,
The backup roll, upper roll roll, and lower roll roll are arranged in this order from the top to the bottom, and the diameter of the top roll is made smaller than the diameter of the bottom roll, so that the diameter of the top roll and the diameter of the bottom roll remain unchanged in the axial direction. At both ends of the backup roll located outside the width of the plate material, backup roll support parts having a diameter larger than that of the backup roll and having a circular cross section are arranged in rotatable contact with the upper outer peripheral surface of the upper rolling roll. The structure is such that the contact surface between the upper rolling roll and the backup roll supporting part is used as a fulcrum, and the position of the backup roll supporting part and the roll bending rod engaged with the roll bending rod are set according to the shape of the rolled product sheet. The bending moment of the upper mill roll is controlled by controlling the amount of working fluid introduced into the cylinder. [Function] Depending on the shape of the product to be rolled and the width of the plate material, a backup LIr with a backup roll support part is used. Figure 6 VIII - ■ Figure 8 Figure 7 Figure 9

Claims (2)

[Claims] (1) A pair of upper and lower rolling rolls are disposed vertically opposing each other, and the upper roll neck bearing bearing the upper rolling roll and the lower roll neck bearing bearing the lower rolling roll are arranged between the upper and lower rolling rolls. Arranged at both ends,
Furthermore, a roll bending rod that is attached to the lower roll neck bearing and presses the upper roll upward is disposed between the upper roll neck bearing and the lower roll neck bearing, and a plate material is passed between the upper roll neck and the lower roll. In a rolling mill for obtaining rolled strip material,
The backup roll, upper roll roll, and lower roll roll are arranged in this order from the top to the bottom, and the diameter of the top roll is made smaller than the diameter of the bottom roll, so that the diameter of the top roll and the diameter of the bottom roll remain unchanged in the axial direction. At both ends of the backup roll located outside the width of the plate material, backup roll support parts having a diameter larger than that of the backup roll and having a circular cross section are arranged in rotatable contact with the upper outer peripheral surface of the upper rolling roll. A rolling mill characterized by: (2) In the rolling method using the rolling mill according to claim 1, the contact surface of the upper rolling roll and the backup roll supporting part is used as a fulcrum, and depending on the shape of the rolled product sheet,
Rolling characterized in that the bending moment of the upper rolling roll is controlled by controlling the position of the backup roll support and the amount of working fluid introduced into the roll bending cylinder engaged with the roll bending rod. Method.