JPH0471705A - Rolling mill and rolling method - Google Patents

Abstract

PURPOSE:To surely, easily and rapidly control the profile of an upper work roll over a wide range by arranging support rolls with a circular shaped section so as to bring into freely rotatable contact with the upper outer peripheral surface of the upper work roll and arranging a moving means with which the support rolls can be freely advanced and retreated in the axial direction of the upper work roll. CONSTITUTION:Cylinders 14, 15 for moving support roll are arranged in the state that each is protruded on the outside wall of a housing 10 so that the position of the support rolls 6, 7 can be easily moved in the axial direction along the outer peripheral surface of the upper work roll 31 in accordance with the width dimension and shape of a sheet stock 5. When the support rolls 6, 7 are moved in the axial direction of the upper rolling roll 31, support roll bearings with the support rolls 6, 7 are made to slide so as to be movable forwards and backwards along a guide rail 22 by properly feeding pressurized oil to the cylinders 14, 15 for moving support roll.

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 four-high rolling mill is shown in FIGS. 8 to 11. In the figure, a pair of upper and lower work rolls 1.2, which are directly used to roll a strip material of a desired thickness through a plate material of a constant thickness, have work roll bearings 25.2 at both ends thereof, respectively.
It is rotatably supported on a shaft at 26. The diameters of both the upper work roll 1 and the lower work roll 2 are normally unchanged in the axial direction of the work roll 1°2.

A pair of upper and lower backup rolls 3. having a crown shape (the diameter of the backup rolls 3, 4 is large at the center and smaller at both ends) sandwiching the pair of upper and lower work rolls 1, 2. Both ends of 4 are respectively,
It is rotatably supported by backup roll bearings 27 and 28. In addition, the above-mentioned upper and lower backup rolls 3
, 4 are configured to be larger than the diameters of the upper and lower work rolls 1.2, and furthermore, the paired backup rolls 3, 4 or the work rolls 1, 2 both have the same diameter.

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, as shown in FIG.
The lower backup roll bearings 28 at both ends of the roller are pressed upward. The pressing force P from the lower backup roll 4 is transmitted to the small-diameter lower work roll 2 that contacts and rotates in the opposite direction, and becomes a rolling force for the plate material 5 inserted between the upper and lower work rolls 1.2.

Further, due to the reaction force R during rolling of the plate material 5 inserted between the upper and lower work rolls 1.2, the upper work roll 1 is bent into a convex shape, and conversely, the lower work roll 2 is bent into a concave shape. These reaction forces R are generated by a pair of upper and lower work rolls 1,
2 from both upper and lower sides, and is transmitted to backup rolls 3.4 which rotate in the opposite direction while contacting each other,
The backup rolls 3 and 4 have a larger diameter and more rigidity than the work rolls 1.2, and the reaction force R transmitted from the work rolls 1 and 2 is relaxed here. During this rolling, as shown in FIG. 12, a thickness difference (H-h) occurs between the end thickness h and the center thickness H of the plate material 5, and the feed rate of the plate material 5 is In the cross-sectional view taken in the direction perpendicular to the direction, the upper and lower shapes of the strip material 5a rolled from between the upper and lower work rolls 1.2 are not flat, and the thickness of the central part of the strip material 5a is thick ( The strip material 5 has a so-called wavy shape, which becomes thinner at both ends.
It will be rolled into a.

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

One of them is a method called the roll pending method, in which a bending cylinder is attached to the roll neck. This method is mainly applied to quadruple rolling mills, and changes the roll crown by forcibly bending the work roll using an external force. This method includes a work roll pending method and a backup roll pending method.

There is also a method called the VC roll method, in which an oil chamber is provided within the rolling roll and the crown of the work roll is changed by adjusting the hydraulic pressure applied thereto.

In addition, there is a heat crown method in which the work roll is partially expanded under pressure to change the crown, and a method in which the expansion plate is adjusted by partially adjusting the amount of roll crimp applied.

[Problems to be Solved by the Invention] As mentioned above, the roll pending method is a method rich in quick response and a certain degree of flexibility, but
As shown in Figure 13 (a) and Figure 13 (b), since the work roll is restrained by the entire surface of the backup roll, it is difficult to give sufficient deflection to the work roll, which not only lacks absolute capacity but also reduces the width of the plate material. It is necessary to rearrange the backup roll and change the crown of the backup roll depending on strength, shape, etc. Further, in the VC method, work rolls are extremely expensive and maintenance is troublesome.

Further, the heat crown method and the method of partially adjusting the amount of roll crown application 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

[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 support roll, upper work roll, lower work roll, and lower backup roll are arranged in this order from the top to the bottom, and the diameters of the upper work roll, lower work roll, and lower backup roll are generally constant in the axial direction of each roll. Further, a support roll having a circular cross section is rotatably disposed in contact with the upper outer peripheral surface of the upper work roll, and a moving means is provided that allows the support roll to move forward and backward in the axial direction of the upper work roll. In addition to controlling the support roll position and the amount of working fluid introduced into the roll pending cylinder engaged with the roll pending rod according to the shape of the product plate, the upper work roll and the support roll are in contact with each other. The profile of the upper work roll is made variable using the contact surface as a fulcrum.

[Operation] Depending on the shape of the product plate to be rolled, the support roll position is moved back and forth in the axial direction of the upper work roll by the moving means. Furthermore, by adjusting the amount of working fluid introduced into the roll pending cylinder, the profile of the upper work roll is appropriately adjusted by the roll pending force.

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.

, FIGS. 1 to 7 show one embodiment of the present invention, and a first embodiment of the present invention is shown in FIGS.
The figure is a front view of the four-high rolling mill, Figure 2 is a side view taken from ■-■ in Figure 1, Figure 3 is a vertical cross-sectional view taken from m--■ in Figure 1, and Figure 4 is a side view taken from FIG. 5 is an enlarged sectional view of the main parts of the rolling mill seen from rV-rV in the figure, FIG. 5 is an enlarged sectional view of the main parts of the roll pending device, and FIGS. 6 and 7 are
2 shows a profile related to control of rolling rolls of a high rolling mill. The configuration of the rolling mill of the present invention will be explained using FIGS. 1 to 7.

The rolling mill 20 in the present invention includes work rolls 31, 32
, lower backup roll 33, work roll bearing 25
, lower backup roll bearing 28, reduction cylinder 8,
It is composed of a roll pending cylinder 9, a housing, and a support roll adjustment device 21. In addition,
5 indicates a plate material.

Reference numerals 31 and 32 indicate work rolls that are directly used for rolling the plate material 5, and the upper work roll 31 and the lower work roll 32 have a flat shape in which the diameters are generally unchanged in the axial direction. The upper work roll 31 and the lower work roll 32 are adjusted by a reduction cylinder 8 in order to roll the plate material 5 to a desired thickness.

Reference numerals 25 and 26 indicate work roll bearings for rotatably supporting the upper and lower work rolls 31 and 32, and both ends of the upper work roll 31 are installed inside the housing 10 that stands on both sides of the rolling mill 20. It is rotatably supported by a pair of upper work roll bearings 25. Further, both ends of the lower work roll 32 are also connected to the upper work roll 31.
Similarly, it is rotatably supported by a lower work roll bearing 26.

Reference numeral 33 denotes a lower backup roll 33, which rotates in the opposite direction while contacting the lower backup roll 32 so that the rolling force from the lower work roll 32 is easily transmitted during rolling. Further, the lower backup roll 33 has a larger diameter than the lower work roll 31 in order to have rigidity.

Reference numeral 28 is a lower backup roll bearing for rotatably supporting the lower backup roll 33;
Both ends of the lower backup roll 33 are connected to the work roll 3
1.32, it is rotatably supported by a pair of lower backup roll bearings 28 installed inside the housing 10 erected on both sides of the rolling mill 200.

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 circumferential surface of the upper work roll 31 are in contact with each other and rotate in opposite directions. In addition, depending on the width dimension and plate shape of the plate material 5, the support roll 6.7
Support roll moving cylinders 14 are provided projecting from the outer wall of the housing 10 so that the positions of the support roll moving cylinders 14 can be easily moved in the axial direction along the outer peripheral surface of the upper work roll 31.
．． 15 are arranged. The support roll moving cylinder 14.15 and the support roll bearing 11.12 are supported by pin support shafts 11a and 12a via the support roll moving cylinder rods 14a and 15a, and the support roll 6.
7 in the axial direction of the upper rolling roll 31,
When appropriate pressure oil is supplied to the cylinders 14-15 for moving the support rolls (not shown), the support roll bearings with the support rolls 6-7 move forward along the guide rails 22.
It is designed to slide so that it can be moved backwards.

Reference numeral 13 denotes an upper joint material, which is stretched between the housings 10, maintains a constant distance between the pair of upright housings 10, and maintains the convex shape of the upper work roll 31 during rolling. The support roll 6.7 is provided adjacent to the guide rail 22 so that a stable rolling force is applied to the support roll 6.7 in the radial direction of the upper work roll 31 against the reaction force of the upper work roll 31. There is.

Reference numeral 9 denotes a roll-pending device, which is composed of an upper roll-pending rod 9a, a lower roll-benzo ink rod 9b, a roll-pending cylinder block 9C, and a roll-pending head 9d.

The lower end of the upper roll pending rod 9a is fixed to the piston 9d, and the upper end is attached to the upper work roll bearing 2.
It is arranged so that it can freely come into contact with and separate from 5. Further, the lower roll pending rod 9b has a piston 9d fixed to its upper end, contrary to the upper roll pending rod 9a.
The lower end portion is arranged so as to be able to freely come into contact with and separate from the lower work roll bearing.

A small diameter communication hole 9e is provided in the center of the roll pending cylinder 9C, and when pressure oil is introduced here from a pressure oil supply device (not shown), the upper and lower roll pending rods engaged with the roll pending cylinder 9C 9
a and 9b are separated from each other and form a roll pending rod 9a.

The respective tips of 9b will press against the upper and lower work roll bearings.

During pressing, the cylinder block 9 for roll pending
A liner 9f is attached to the upper and lower work roll bearings 2526 side of the outer peripheral wall of c.
5.26 roll pending cylinder block 9C
Since the liner 9g is attached to the side outer peripheral surface, the upper work roll bearing 25 is pushed upward along the contact surface 9h of the liners 9f and 9g, and the support roll 6.7 and the upper workpiece A bending moment is easily applied using the contact surface with the roll 31 as a fulcrum, and the upper work roll 31 has a small diameter and a flat shape.
The profile is corrected during rolling so that it changes from a convex shape to a flat shape. On the other hand, the lower work roll 32 is configured to rotate in the opposite direction while being pressed against the surface of the lower backup roll 33.

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 pressure oil is introduced into the reduction cylinder, as the reduction cylinder head 8a rises, the tip of the reduction cylinder head 8a contacts and presses the lower part of the lower backup roll bearing 28, causing the lower backup roll 33 to move upward. It is used as a rolling force for correcting the strip material 5a via the lower work roll 32 which rotates in the opposite direction while being in contact with the lower work roll 32.

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.

When a series of preparations for the rolling mill 20 are completed, the plate material 5 is inserted between the upper work roll 31 and the lower work roll 32. When passing between a pair of upper and lower work rolls 31 and 32, the plate material 5 is a strip material 5a having a desired upper and lower flat surface.
rolled into At this time, the shape of the strip material 5a is determined by the conventional visual method, but in order to eliminate individual differences and improve inspection accuracy, a contact method using a sensor roll or a non-contact method using light or magnetism is used. It can also be done by

By sliding the support roll 6.7 back and forth in the axial direction of the upper work roll 31 or controlling the pressure of the roll pending rods 9a and 9b so that the shape of the strip plate material 5a becomes a desired shape. , ear wave (the center part of the strip material 5a is thicker and both ends are thinner) and medium elongation (
This can prevent the strip material 5a from being thin at the center and thick at both ends.

FIG. 6 shows test results summarizing how the profiles of the upper and lower work rolls 31 and 32 change 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. and shown in FIG.

Figure 6 shows a roll diameter of 600 mm, a rolling force of 600 TON,
Set the distance between support rolls 6.7 to 1400mm,
It shows the change in the profile of the upper work roll 31 when the roll pending force is adjusted from OTON to 125TON.

Figure 7 shows a roll diameter of 600 mm and a rolling force of 600 TON.
, shows the change in the profile of the upper work roll when the distance between the support rolls 6.7 is set to 1600 mm and the roll pending force is adjusted from OTON to 1257 ON.

As is clear from FIGS. 6 and 7, according to the rolling mill 20 of the present invention, the upper work roll 31 can be freely adjusted from a convex shape to a concave shape depending on the pending force and the position of the support roll 6.7. It can be seen that this method has a very wide range of shape and crown control capabilities.

In the present invention, from the top to the bottom of the rolling mill 20, a support roll 6.7, an upper work roll 31, a lower work roll 32, and a lower backup roll 33 are provided.
However, contrary to this, the rolling mill 20
From the top to the bottom of the lower backup roll 3
3. The lower work roll 32, the upper work roll 31, and the support roll 6.7 may be arranged in this order.

Moreover, the said roll pending rod 9a.

Although the case has been described in which pressurized oil is used as the working fluid when moving the motor 9b forward and backward, compressed gas such as air or nitrogen gas may also be used.

Furthermore, the support roll 6.7 is attached to the upper work roll 31.
When moving in the axial direction of the support roll, a pressure oil type cylinder was used to supply pressure oil to the cylinders 14 and 15 for moving the support rolls. Other transportation means may also be used.

Furthermore, although the case has been described in which the diameters of the lower work roll 32 and the lower backup roll 33 are unchanged in the axial direction, similar results can be obtained by using crown-shaped rolls with a slight center height.

[Effects of the Invention] As is clear from the above description, according to the present invention, the support roll, the upper work roll, the lower work roll, and the lower backup are arranged in this order from the top to the bottom, and the upper work roll, the lower work roll The roll and lower backup roll diameters remain unchanged in the axial direction of each roll.
Furthermore, a support roll having a circular cross section is arranged in rotatable contact with the upper outer peripheral surface of the upper work roll,
By disposing a moving means that allows the support roll to move forward and backward in the axial direction of the upper work roll, the profile of the upper work roll 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 work 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 work rolls and backup rolls are needed, greatly improving product cycles. do.

In addition, the support roll position and the amount of working fluid introduced into the roll pending cylinder engaged with the roll pending rod are controlled according to the shape of the product plate.
By using the contact surface between the upper work roll and the support roll as a fulcrum, the upper work roll is pushed upward and bent, and the lower work roll is pushed downward and pressed against the surface of the lower backup roll. The profile of the rolls and lower work rolls can be easily changed, making it easy to roll and modify the plate material.
And it can be done quickly.

[Brief explanation of drawings]

1 to 7 show one embodiment of the present invention, FIG. 1 is a front view of a four-high rolling mill, FIG. 2 is a side view taken from ■-■ in FIG. 1, and FIG. Figure 1 is a vertical cross-sectional view taken from ■-m in Figure 1, Figure 4 is an enlarged cross-sectional view of the main parts of the rolling mill seen from IV-rV in Figure 1, and Figure 5 is a roll pending view seen from ■-■ in Figure 4. The enlarged cross-sectional view of the cylinder, FIGS. 6 and 7, show the profile related to the control of the upper work roll of a four-high rolling mill to which the present invention is applied. 8 to 13 show a conventional example similar to the present invention, FIG. 8 is a front view of a four-high rolling mill, and FIG. 9 is a front view of a four-high rolling mill.
10 is an enlarged sectional view of the main parts of the rolling mill seen from xx in FIG. 8, and FIG. 11 is a roll pending cylinder seen from XI-XI in FIG. 10. FIG. 12 is an enlarged cross-sectional view of the roller, FIG. 12 is an exaggerated illustration of the roll deflection due to the pressing force from the rolling cylinder, and FIG. 13 is a schematic diagram showing the increasing and decreasing state of the crown. 1.31... Upper work roll, 2.32... Lower work roll, 3... Upper backup roll, 4.33...
・Lower backup roll, 5...Plate material,
5a... Strip plate, 6.7... Support roll, 8... Reduction cylinder, 9...
... Bearing for roll pending, 11.12 ... Bearing for support roll, 13 ... Upper joint material, 14.15 ... Cylinder for supporting roll movement, 20
...Rolling mill, 21...Support roll adjustment device, 25...
... Upper work roll bearing, 26 ... Lower work roll bearing, 27 ... Upper backup roll bearing, 28 ... Lower backup roll bearing.

Claims (2)

[Claims] (1) An upper work roll bearing, which is arranged in the order of an upper backup roll, an upper work roll, a lower work roll, and a lower backup roll from above to below in opposition to each other, and which connects the upper work roll to both ends, and a lower work roll. A roll pending cylinder is disposed at each end of a lower work roll bearing that supports the roll, and a roll pending cylinder is disposed between the upper work roll bearing and the lower work roll bearing, and the upper work roll bearing engages with the roll pending cylinder. An upper roll pending rod that presses the work roll upward and a lower roll pending rod that presses the lower work roll downward are arranged, and the rolled strip material is passed through a plate between the upper work roll and the lower work roll. In the rolling mill to obtain
The support roll, the upper work roll, the lower work roll, and the lower backup roll are arranged in this order from the top to the bottom, and the diameters of the upper work roll, the lower work roll, and the lower backup roll remain unchanged in the axial direction of each roll, and further, A support roll having a circular cross section is rotatably arranged in contact with the upper outer peripheral surface of the upper work roll, and a moving means is arranged to move the support roll forward and backward in the axial direction of the upper work roll. A rolling mill featuring: (2) In the rolling method using the rolling mill according to claim 1, the position of the support roll and the amount of working fluid introduced into the roll-pending cylinder engaged with the roll-pending rod are controlled according to the shape of the product plate. The upper work roll is pressed and bent upward, and the lower work roll is pressed and bent downward, using the abutting surface of the upper work roll and the support roll as a fulcrum, and is pressed against the surface of the lower backup roll. rolling method.