JPH0471706A - Rolling mill and rolling method - Google Patents

Abstract

PURPOSE:To surely, easily and rapidly control the profile of an upper rolling roll over a wide range by making both diameters of the upper rolling roll and lower rolling roll equal, also making the profile of the upper rolling roll constant in the axial direction and making the profile of the lower rolling roll into a crown shape such that the roll diameter of the middle part is larger and the roll diameters of both ends are smaller or into a flat shape. CONSTITUTION:Both the diameters of the upper rolling roll 31 and lower rolling roll 32 are made equal, also the profile of the upper rolling roll 31 is axially made constant, the profile of the lower rolling roll 32 is made into a crown shape such that the roll diameter of the middle part is larger, the roll diameters of both ends are smaller, or into a flat shape and a support roll with the circular shaped section is arranged so as to bring into freely rotatable contact with the upper outer peripheral surface. When using the rolling mill 20, the upper rolling roll 31 is freely adjustable from convex to concave by bending force and this mill possesses the extremely wide range of the capacity of shape control and crown control.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used in the fields of iron and non-ferrous metals 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.

[Conventional technology] A conventional two-high rolling mill is shown in FIGS. 7 to 10.

In the two-high rolling mill shown in FIGS. 7 to 10, 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 small at both ends) are used. Both ends are rotatably supported by roll neck bearings 3 and 4, and a plate material 5 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 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 10, the roll neck bearings 4 at both ends of the lower rolling roll 2 are connected to each other as shown in FIG. (This is the force that tries to roll the plate material 5 inserted between the upper and lower rolling rolls 1.2) and the rolling force F of the plate material 5 inserted between the upper and lower rolling rolls 1.2. Due to the reaction force R, the plate material 5 after rolling
The shape of a (strip material) is such that there is a difference (H-h) in the thickness of the strip material 5 between the end thickness h and the center thickness H of the strip material 5a, and the feed of the plate material 5 is In a cross-sectional view taken in a direction perpendicular to this direction, the top and bottom shapes of the strip material 5a are not flat.

FIG. 12 shows test results when the plate material 5 was rolled using a conventional rolling mill. Crown-shaped upper and lower rolling rolls 1
, 2 has a diameter of 860 mm, and the rolling force F of the rolling cylinder 8 is 6 oO tons, the profile of the rolling roll 1.2 exhibits a convex deflection. The strip material 5a is rolled in a so-called wavy shape, which is thick and thinner at the ends.

Conventionally, various proposals have been made to prevent the strip material 5a from forming an undulating shape and to roll the strip material 5a so that its upper and lower surfaces are flat.

Some examples are briefly described below.

One of them is a method in which the upper and lower rolling rolls 1 and 2 are crowned in advance. In other words, if the deflection of the upper and lower rolls 1.2 is calculated in advance and the center part of the upper and lower rolls 1.2 is made thicker so that this deflection can be corrected, and the rolls are made into medium-height rolls, the rolling load can be reduced. When the upper and lower rolling rolls 1 and 2 are deflected, the upper and lower rolling rolls 1 and 2 on the side that contacts the plate material 5 become flat, and a strip material 5a of uniform thickness is obtained. This kind of crown is generally called an initial 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 bending cylinder is attached to the upper and lower roll neck bearings 3.4. This method is mainly used in quadruple rolling mills, and changes the roll crown by forcibly bending the rolling rolls using an external force. This method includes a work roll bending method and a backup 6-rupending 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.

In addition, there is a heat crown method in which the upper and lower rolling rolls 1.2 are partially loaded and expanded 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 deflection to the rolling roll, and it is absolutely Lacking ability.

In addition, in method (2) C, the 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 rolled strip material 5a conforms to the desired shape or not, the crown control is performed severely, so 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.

In other words, the side diameters of the upper and lower rolls are the same, the profile of the upper roll remains unchanged in the axial direction, and the profile of the lower roll has a larger roll diameter at the center and a smaller diameter at both ends. A support roll having a reduced crown shape or a flat shape and having a circular cross section is disposed in rotatable contact with the upper outer peripheral surface of the upper rolling roll, and further, an axis of the upper rolling roll, which is the support roll. The configuration includes a moving means that can move forward and backward in the center direction, and further uses the contact surface of the upper rolling roll and the support roll as a fulcrum to control the support roll position and roll bending according to the shape of the rolled product sheet. The bending moment of the upper rolling roller is controlled by controlling the amount of working fluid introduced into the roll bending cylinder engaged with the roll bending rod.

[Operation] Depending on the shape of the product to be rolled, the position of the support roll is moved back and forth in the axial direction of the upper rolling roll by a moving means,
Further, by adjusting the amount of working fluid introduced into the roll bending cylinder, the roll pending force to the upper rolling roller can be adjusted as appropriate. In this way, the shape of the rolled product sheet can be easily and quickly corrected, and a 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 6 show one embodiment of the present invention, FIG. 1 is a front view of a two-high rolling mill, FIG. 2 is a side view taken from ■-■ in FIG. 1, and FIG. FIG. 4 is an enlarged cross-sectional view of the main parts of the rolling mill seen from rV-IV in FIG. 1, and FIGS. The configuration of the two-high rolling mill of the present invention will be described with reference to FIGS. 1 to 6, which show profiles related to control of rolling rolls of the rolling mill.

The two-high rolling mill 20 in the present invention includes rolling rolls 31,
32, roll neck bearings 3, 4, reduction cylinder 8, roll bending cylinder 9, housing 10. and a support roll adjusting device 21. In addition, the code|symbol 5 shows a board 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 are provided slightly apart from each other by the rolling cylinder 8 in order to roll the plate material 5 to a desired thickness. Reference numeral 3.4 indicates the upper and lower rolling rolls 3.
1.32 are rotatably supported, and both ends of the upper rolling roll 310 are supported by a pair of roll neck bearings 3 installed inside the housing 10 erected on both sides of the rolling mill 20. It is rotatably supported.

Further, both ends of the lower mill roll 32 are rotatably supported by roll neck bearings 4 similarly to the upper mill roll 1.

Next, the support roll adjusting device 21 of the present invention will be explained. The support roll adjusting device 21 includes a support roll 6.7, support roll bearings 11, 12, and a support roll movement cylinder 14.15.

A pair of support rolls 6.7 having a circular shape are each supported by a support shaft 6 by a support roll bearing 11.12.
It is rotatably supported by shafts a and 7a, and during rolling, the support roll 6.7 and the outer peripheral surface of the upper rolling roll 31 are in contact with each other and rotate in opposite directions. In addition, depending on the width dimension of the plate material 5 and the way the ear waves are formed,
．． Support roll moving cylinders 1 are provided in a manner protruding from the outer wall of the housing 10 so that the positions of the support rolls 7 and 7 can be easily moved in the axial direction along the outer peripheral surface of the upper rolling roll 31.
4.15 is installed. The support roll moving cylinder 14.15 and the support roll bearing 11.12 are:
Bin support shafts 11a and 15a are supported via cylinder rods 14a and 15a for moving the support rolls, and the support rolls 6
．． 7 in the axial direction of the upper rolling roll 31, support roll moving cylinders 14 and 15 (not shown) are used.
When a suitable amount of pressurized oil is supplied to the support roll 6.7, the support roll bearing having the support roll 6.7 can slide forward and backward along the guide rail 22.

Reference numeral 13 denotes an upper joint material, which is stretched between the housings 10, and maintains a constant distance between the pair of upright housings 10, and also prevents the convex shape of the upper rolling roll 31 during rolling. To prevent this, the support roll 6.7 is moved against the upper rolling roll 31 against the reaction force of the upper rolling roll 31.
The guide rail 22 is provided adjacent to the guide rail 22 so as to provide a stable pressing force in the radial direction.

Reference numeral 9 denotes 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. The roll neck bearing 3 is pushed upward,
A bending moment acts on the contact surface between the so-called support roll 6.7 and the upper rolling roll 31 as a fulcrum, and the upper rolling roll 31 has a flat shape.
The profile is corrected during rolling so that it changes from a convex shape to a flat shape.

Reference numeral 8 indicates a reduction cylinder 8, and a reduction cylinder head 8a is disposed in the reduction cylinder 8 so as to be able to move up and down by engaging with the reduction cylinder 8. During rolling, a pressure oil supply device (not shown) is provided. When pressurized oil is introduced into the rolling cylinder, 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 5a.

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

Before rolling the plate material 5, the position of the support roll 6.7 is determined in advance according to the width of the plate material 5, and a flat or crown-shaped lower rolling roll 32 is set depending on the desired shape of the strip material 5a. Attach it so that it can be rolled.

When a series of preparations for the rolling mill 2o are completed, the plate material 5 is inserted between the upper rolling roll 31 and the lower rolling roll 32. When passing between a pair of upper and lower rolling rolls 31 and 32,
The plate material 5 is a strip material 5 having a desired upper and lower flat surface.
It is rolled into a. At this time, the shape of the strip material 5a is judged by visual inspection as in the past, but it eliminates individual differences and
In order to improve inspection accuracy, a contact method using a sensor roll or a non-contact method using light or magnetism can also be used. By sliding the support roll 6.7 back and forth in the axial direction of the upper rolling roll 1 so that the shape of the strip plate material 5a becomes a desired shape, the ear wave (
It is possible to prevent the strip plate material 5a from being thick at the center and thin at both ends) and elongation (the strip plate material 5a is thin at the center and thick at both ends).

FIG. 5 and FIG. 5 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 5 is rolled using the rolling mill 20 of the present invention described above. It is shown in Figure 6.

In Fig. 5, the upper and lower rolling rolls 31.32 diameter is 700 mm, the rolling force is 600 TON, and the distance between the support rolls 6.7 is 14.
00mm and the roll pending force is adjusted from OTON to 150TON.
shows changes in the profile of

In FIG. 6, the upper rolling roll 31 has a diameter of 700 mm.

Rolling force 600 TON, distance between support rolls 6.7 1
Set it to 600mm and set the roll pending force to OTON.
Upper rolling roll 3 when adjusted from to 125TON
1 shows changes in the profile of No. 1.

As is clear from FIGS. 5 and 6, the rolling mill 2 of the present invention
According to No. 0, it can be seen that the upper rolling roll 31 can be freely adjusted from a convex shape to a concave shape by the pending force, and has an extremely wide range of shape control ability and crown control ability.

As mentioned above, in the embodiment of the present invention, the roll bending rod 9 is installed alongside the roll neck bearing 4 inside the housing 10, but the rod 9 is not limited to this, and may be installed directly on the housing 10. Moreover, although it has been described that pressure oil is introduced into the roll bending cylinder 9 when the roll bending rod 9 is moved back and forth, air is also used.

Compressed gas such as nitrogen gas may also be used.

Furthermore, when moving the support roll 6.7 in the axial direction of the upper rolling roll 31, it was carried out using a hydraulic type cylinder that supplied pressure oil to the support roll movement cylinder 14.15, but an electric motor was used to move the support roll 6.7. Other moving means such as a chain or a rack and binion may be used as the driving source.

Furthermore, although the case where the profile of the upper rolling roll 31 is unchanged in the axial direction has been described, similar results can be obtained even if a crown-shaped rolling roll with a slight center height is used.

[Effects of the Invention] As is clear from the above description, according to the present invention, the side diameters of the upper rolling roll and the lower rolling roll are made the same, and the profile of the upper rolling roll remains unchanged in the axial direction. The profile of the lower rolling roll is such that the diameter of the roll in the center is large, the rolls at both ends are small (crown-shaped or flat-shaped), and the support roll with a circular cross-section on the upper outer peripheral surface of the upper rolling roll is rotatable. By arranging the supporting rolls in contact with each other, and by disposing a moving means that can move the support rolls forward and backward in the axial direction of the upper rolling roll, the profile of the upper rolling roll can be reliably, easily, and quickly changed over a wide range. Because you can control
Rolling and modification of plate materials can be easily performed. Furthermore, conventionally, a large number of rolling rolls with different initial crown shapes were prepared depending on the width of the sheet, but this is no longer necessary, and only a small number of rolling rolls are required, greatly improving the product cycle. Further, using the contact surface of the upper rolling roll and the support roll as a fulcrum, the working fluid is introduced into the roll bending cylinder engaged with the support roll position and the roll bending rod according to the shape of the rolled product sheet. Since the benzo ink moment of the upper rolling roll is controlled by controlling the amount, the profile of the upper rolling roll can be easily changed, and accordingly, the rolling and modification of the plate material can be easily and quickly performed. .

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention, FIG. 1 is a front view of a two-high rolling mill, FIG. 2 is a side view taken from ■-■ in FIG. 1, and FIG. FIG. 4 is an enlarged cross-sectional view of the main parts of the rolling mill seen from IV-IV in FIG. 1, and FIG. 115 and FIG.
2 shows a profile related to control of rolling rolls of a high rolling mill. 7 to 12 show a conventional example similar to the present invention, in which FIG. 7 is a front view of a two-high rolling mill, FIG. 8 is a side view taken from ■-■ in FIG. 7, and FIG. Figure 9 is IX of Figure 7.
Fig. 10 is an enlarged sectional view of the main parts of the rolling mill as seen from XX in Fig. 7, Fig. 11 is an exaggerated principle diagram showing the rolling state of plate material, Fig. 12 shows a profile related to control of rolling rolls of a two-high rolling mill. 1.31... Upper rolling roll, 2,32... Lower rolling roll, 3... Upper roll neck bearing, 4...
Lower roll neck bearing, 5... Plate material,
5a... Strip material, 6.7... Support roll, 8... Reduction cylinder, 9...
Cylinder for roll bending, 10... Housing, 11.12... Bearing for support roll, 13...
...Top joint material, 14.15...Cylinder for supporting roll movement, 20
...Rolling mill, 21...Support roll adjustment device. Patent applicant Ube Industries Co., Ltd. Fig. 2 m Fig. 3 Fig. 4 Fig. 7 Fig. IX Fig. 5 Fig. 6 Radius of strip plate material (mm) Fig. 8 Fig. 9 Fig. 10

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 diameters of the upper and lower rolls are the same, and the profile of the upper roll remains unchanged in the axial direction, while the profile of the lower roll has a larger roll diameter at the center and smaller roll diameters at both ends. A support roll having a crown shape or a flat shape and having a circular cross section is disposed in rotatable contact with the upper outer peripheral surface of the upper rolling roll, and further, the support roll is
A rolling mill characterized by having a moving means that can freely move forward and backward in the axial direction of the upper rolling roll. (2) In the rolling method using the rolling mill according to claim 1, the contact surface of the upper rolling roll and the support roll is used as a fulcrum, and the support roll position and roll bending are adjusted according to the shape of the rolled product sheet. A rolling method characterized in that the bending moment of the upper rolling roller is controlled by controlling the amount of working fluid introduced into the roll bending cylinder engaged with the roll bending rod.