JPH0471707A - 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 the diameter of the upper rolling roll smaller than that of a lower rolling roll and making the diameters of the upper rolling roll and lower rolling roll constant in the axial direction. CONSTITUTION:The upper rolling roll 31 of which the diameter is smaller than that of the lower rolling roll 32 and the lower rolling roll 32 are provided so as to be separated at a some distance with a screw-down cylinder to roll into a desired thickness of sheet material 5. The sheet material 5 is inserted between the upper rolling roll 31 and the lower rolling roll 32. When the sheet material is passed through between a pair of the upper and lower rolling rolls 31, 32, the sheet material 5 is rolled into a desired strip stock with flat upper and back surfaces. It is made known that, when using the rolling mill 20 of this invention, the upper rolling roll 31 is freely adjustable from convex to concave by bending force and this mill possesses an extremely wide range of the capacity of shape control and crown control, and the deflection of the lower rolling roll is small.

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.

[Prior Art] A conventional two-high rolling mill is shown in FIGS. 8 to 11. In the two-high rolling mill shown in FIGS. 8 to 11, both ends of a pair of upper and lower rolls 1.2 having a crown shape (the diameter of the roll 1.2 is large at the center and smaller at both ends) are used. It is rotatably supported by a roll neck bearing 3.4,
A plate material 5 of a constant thickness is passed through a gap in the center body of the roll 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 1O, the roll neck bearings 4 at both ends of the lower rolling roll 2 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. 13 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 700 mm and the rolling force F of the rolling cylinder 8 is 600 tons. The strip material 5a is rolled into a so-called wave-like strip material 5a that is thicker and thinner at both 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 the upper and lower surfaces thereof are flat.

Some examples are briefly described below.

One method is to crown the upper and lower rolling rolls 1.2 in advance. In other words, the deflection of the upper and lower rolling rolls 1.2 is calculated in advance and the upper and lower rolling rolls 1.2 are crowned so that this deflection can be corrected. If the center portions of the rolling rolls 1 and 2 are made thicker and the rolling rolls are medium and high, when the upper and lower rolling rolls 1.2 are deflected due to rolling load, the upper and lower rolling rolls 1.2 on the side that contacts the plate material 5 will become flat; A strip material 5a having a uniform thickness can be obtained. Such a round 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 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 VQ crawl 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 and 2 are partially forced to expand 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, although the roll bending method is a method with quick response and a certain degree of flexibility, it is difficult to give sufficient deflection to the roll because the roll is restrained by the entire surface of the backup roll. Absolutely lacking in ability.

In addition, in the 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 crown control is strictly performed to check whether the rolled strip material 5a 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.

The diameter of the upper rolling roll is made smaller than the diameter of the lower rolling roll, the diameter of the upper rolling roll and the diameter of the lower rolling roll remain unchanged in the axial direction, and a support roll having a circular cross section is freely rotatable on the upper outer peripheral surface of the upper rolling roll. placed in contact with the
Furthermore, the support roll is configured to include a moving means that can freely move forward and backward in the axial direction of the upper rolling roll, and the rolled product is further provided with a contact surface between the upper rolling roll and the support roll as a fulcrum. The bending moment of the upper rolling roller is controlled by controlling the support roll position and the amount of working fluid introduced into the roll bending cylinder engaged with the roll bending rod according to the plate shape.

[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 applied 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 sectional view of the main parts of the rolling mill seen from rV-rV in FIG. 1, and FIGS. 2 shows a profile related to control of rolling rolls of a type rolling mill. The configuration of the rolling mill of the present invention will be explained using FIGS. 1 to 6.

The rolling mill 20 in the present invention includes rolling rolls (or work rolls) 31, 32 . Roll neck bearing 3, 4
．． Reduction cylinder 8. Cylinder for roll bending9.
Housing 10. and a support roll adjustment device 21.

Note that 5 indicates a plate material.

Reference numerals 31 and 32 denote 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 5 to the desired thickness. It is provided. 3.
4 is a roll neck bearing for rotatably supporting the upper and lower rolling rolls 31 and 32;
Both ends of the housing 1 are erected on both sides of the rolling mill 20.
It is rotatably supported by a pair of roll neck bearings 3 installed inside the roller. 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 adjustment device 21 is composed of a support roll 6.7, a support roll bearing 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.
a,? The support roll 6.7 is rotatably supported on a shaft at a point a, and during rolling, the support roll 6.7 and the outer circumferential surface of the upper rolling roll 31 are in contact with each other and rotate in opposite directions. Further, depending on the width dimension and lug shape of the plate material 5, the support rolls 6 and 7 are provided with protrusions on the outer wall of the housing 10 so that the positions of the support rolls 6 and 7 can be easily moved in the axial direction along the outer peripheral surface of the upper rolling roll 31. Support roll moving cylinder 14.1
5 are arranged. Support roll moving cylinder 1
4.15 and the support roll bearing 11.12 are connected to the bin support shaft 11a via support roll moving cylinder rods 14a and 15a.

12a, the support roll 6.7 is connected to the upper rolling roll 3
1, when appropriate pressure oil is supplied to the support roll moving cylinder 14.15 (not shown), the support roll bearing with the support roll 6.7 moves forward and backward along the guide rail 22. It is designed to be able to slide.

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,
By making the upper rolling roll 31 smaller in diameter than the lower rolling roll 32, a bending moment can easily act on the contact surface between the so-called support roll 6.7 and the upper rolling roll 31 as a fulcrum. The profile of the small-diameter upper rolling roll 31 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 positions of the support rolls 6.7 are determined in advance according to the width of the plate material 5, and the lower rolling roll 32 is mounted so as to be able to roll according to the desired shape of the strip material 5a. oh(.

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°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 (thin at both ends) or elongated in the center (thin at the center at both ends).

The profile of the upper and lower rolling rolls 31 and 32 when the plate material 5 is rolled using the rolling mill 2o of the present invention described above is as follows.
Test results summarizing how the pending force changes depending on the magnitude are shown in FIGS. 5, 6, and 7.

Figure 5 shows the upper and lower rolling rolls 31.32 diameter 600mm, rolling force 600TON, and the distance between the support rolls 6.7 and 140mm.
The change in the profile of the upper rolling roll 31 when the roll pending force is adjusted from OTON to 120TON is shown.

In Fig. 6, the upper rolling roll diameter is 700 mm and the rolling force is 60 mm.
0TON1 support roll 6.7 distance 1600mm
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 7 shows a lower rolling roll diameter of 920 mm and a rolling force of 600 mm.
The deflection of the lower mill roll in the case of TOH is shown.

As is clear from FIG. 5, FIG. 6, and FIG. 7, according to the rolling mill 20 of the present invention, the upper rolling roll 31 can be freely adjusted from a convex shape to a concave shape by the pending force, and has a very wide range of shapes. It is found that the lower rolling roll has the control ability and the crown control ability, and the lower rolling roll
Even when compared with Figure 3, it can be seen that the amount of deflection of the roll is small.

In the present invention, the diameter of the upper rolling roll is made smaller than the diameter of the lower rolling roll, and the support roll 6.7 is rotatably disposed on the upper rolling roll 31 in contact with the upper rolling roll 31. However, on the contrary, the diameter of the upper rolling roll is made larger than the diameter of the lower rolling roll, and the support roll 6.7 is rotatably arranged under the lower rolling roll 32 so as to be in contact with the lower rolling roll 32. It may be configured as follows.

As described above, in the embodiment of the present invention, the roll bending rod 9 is installed together with the roll neck bearing 4 in the housing 1o, but the rod 9 is not limited to this, and may be installed directly on the housing 10. Although it has been described that pressure oil is introduced into the roll bending cylinder when the bending rod 9 moves forward and backward,
Compressed gas such as air or 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, 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.

[Effects of the Invention] As is clear from the above, according to the present invention, the diameter of the upper rolling roll is made smaller than the diameter of the lower rolling roll, and the diameter of the upper rolling roll and the diameter of the lower rolling roll remain unchanged in the axial direction.
A support roll having a circular cross section is rotatably disposed in contact with the upper outer circumferential surface of the upper roll, and a moving means is further provided for moving the support roll forward and backward in the axial direction of the upper roll. With this arrangement, the profile of the upper rolling roll can be reliably, easily, and quickly controlled over a wide range, making it easy to roll and modify the plate material. Furthermore, unlike the conventional method of preparing a large number of rolling rolls with different initial crown shapes depending on the sheet width, this is no longer necessary, and only a small number of rolling rolls are needed, greatly improving the product cycle. Further, the contact surface of the upper rolling roll and the support roll is used as a fulcrum, and the amount of working fluid introduced into the roll bending cylinder engaged with the support roll position and the roll bending rod is determined according to the shape of the rolled product sheet. By controlling the bending moment of the upper rolling roller, the profile of the upper rolling roll can be easily changed, and accordingly, the rolling and modification of the plate material can be done easily and quickly.

[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 rV-IV in FIG. 1, and FIGS. 5, 6, and 7 illustrate the present invention. The profile related to the control of the rolling rolls of the applied two-high rolling mill is shown. 8 to 13 show conventional examples similar to the present invention, in which FIG. 8 is a front view of a two-high rolling mill, FIG. 9 is a side view taken from IX-IX in FIG. 1, and FIG. Figure 10 is a longitudinal sectional view taken from the line x-x in Figure 8, Figure 11 is an enlarged sectional view of the main parts of the rolling mill seen from The principle diagram shown in FIG. 13 shows a profile related to the control of the rolling rolls of the 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... Roll bending cylinder, 1o... Housing, 11.12 ...Support roll bearing, 13...
・・Top joint material, 14.15・・Cylinder for supporting roll movement, 2o
...Rolling mill, 21...Support roll adjustment device. -II Patent applicant Ube Industries, Ltd. Figure 2 Figure 1 Figure 3 Figure 4 Figure 7 Radius of strip material (mm) - Figure 5 Radius of strip material (mm) Figure 6 Figure 8 -X Figure 9 Figure 11 Figure 10 Figure 12 Figure 13 Width of strip material (mm)

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 diameter of the upper rolling roll is made smaller than the diameter of the lower rolling roll, the diameter of the upper rolling roll and the diameter of the lower rolling roll remain unchanged in the axial direction, and a support roll having a circular cross section is freely rotatable on the upper outer peripheral surface of the upper rolling roll. placed in contact with the
Furthermore, the rolling mill is characterized in that a moving means is provided that allows the support roll to 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 that is engaged with the rolling rod.