JPH04172108A - Rolling mill - Google Patents

Abstract

PURPOSE:To control the profiles of upper and lower work rolls over a wide range by arranging upper and lower support rolls which can be freely moved back and forth in the direction of the axial center of the upper and lower work rolls with a moving means. CONSTITUTION:Rolls are arranged in order of the upper support roll 6, upper work roll 1, lower work roll 2 and lower support roll 18 from the upper part towards the lower part. The diameters of the upper and lower work rolls 1, 2 are made constant in the direction of the axial center of roll, the cross sections on the outer circumferential surfaces of both working rolls 1, 2 are circular and also each pair of the support rolls 6, 18 which are situated on the out sides from the width of metal plate 5 are arranged while abutting on each other. The upper support rolls 6 are provided on the tip of the piston rods 14a of cylinders 14 with bearings 11, also arranged so as to be freely movable back and forth in the direction of the axial center of the upper working roll 1, the lower support rolls 18 are inserted into a back-up shaft 33 which is spanned between the housings 10 and the moving means 21 which can be freely moved back and forth in the direction of the axial center of the lower work roll 2.

Description

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

[Prior Art] A conventional four-high rolling mill is shown in FIGS. 9 to 14. In the figure, a pair of upper and lower work rolls 1.2 that are directly used for rolling a strip material 5a of a desired thickness through a plate material 5 of a constant thickness are rotatably supported at both ends by work roll bearings 25 and 26, respectively. has been done. 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.

The pair of upper and lower backup rolls 1 and 2 are sandwiched together in a crown shape (the diameter of the backup rolls 3 and 4 is large at the center and the diameter is small at both ends). 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 larger than the diameters of the upper and lower work rolls 1.2, and furthermore, the paired backup rolls 3.4 or 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 IO, the lower backup roll 4 is moved 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 applied to a pair of upper and lower work rolls 1.
Although it is transmitted to backup rolls 3 and 4 which sandwich 2 from above and below and rotate in opposite directions while contacting each other,
The backup rolls 3 and 4 have a larger diameter and more rigidity than the work roll 1.2, so that the reaction force R transmitted from the work roll 1.2 is alleviated here. During this rolling, as shown in FIG. 13, 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 a cross-sectional view cut in a 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 portion of the strip material 5a is thick. , so-called wave-like strip material 5 that is 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.

Other methods include a heat crown method in which the work roll is partially heated 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, the roll pending method is a method that is quick to respond and has a certain degree of flexibility, but the problem shown in FIG.
As shown in a) and FIG. 14(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 by 1. 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 coolant applied are extremely flexible, but have a 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 view of the above points, in the present invention, the upper support roll, upper work roll, lower work roll, and lower support roll are arranged in this order from above to below, and the diameters of the upper work roll and the lower work roll are centered on the axis of the roll. Each pair of support rolls, which are fixed in the direction, have a circular cross section on the upper outer circumferential surface of the upper work roll and the lower outer circumferential surface of the lower work roll, and are located outside the width of the plate material, are rotatable. The upper support roll is arranged in contact with the cylinder, and the upper support roll is arranged at the tip of the piston rod engaged with the cylinder via a support roll bearing. The roll is configured to have a moving means that can freely move forward and backward in the axial direction of the lower work roll, which is inserted through a backup shaft suspended between housings housing bearings.

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

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.

Figures 1 to 8 show one embodiment of the present invention, with Figure 1 being a front view of a four-high rolling mill, Figure 2 being a side view taken from ■-■ in Figure 1, and Figure 3 being a side view of a four-high rolling mill. Fig. 4 is an enlarged cross-sectional view of the main parts of the rolling mill seen from IV-IV in Fig. 2, and Fig. 5(a) is a longitudinal sectional view taken from m--■ in Fig. 2. Figure 5 (b) is an enlarged sectional view of the main part of the support roll viewed from the side.
FIG. 6 is an enlarged sectional view of the main part of the roll pending device taken from Vl-Vl in FIG. 4, and FIGS. 7 and 8 show the present invention applied thereto. I did 4
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 8.

The rolling mill 20 according to the present invention includes a work roll 1.2, a reduction cylinder 8, a roll pending device 9, a housing 10, an upper support roll adjustment device 19, a lower support roll adjustment device 21, work roll bearings 25, 26,
It is composed of a backup shaft 33 and a backup shaft bearing 38. In addition, the code|symbol 5 shows a board material.

Reference numeral 1.2 indicates a work roll that is directly used for rolling the plate material 5, and the upper work roll 1 and the lower work roll 2 have a flat shape in which the diameters are generally unchanged in the axial direction. The upper work roll 1 and the lower work roll 2 are adjusted by a reduction cylinder 8 in order to roll the plate material 5 to a desired thickness.

Reference numerals 25 and 26 denote work roll bearings for rotatably supporting the upper and lower work rolls 1.2, and both ends of the upper work roll 1 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 upper work roll bearings 25. Further, both ends of the lower work roll 2 are rotatably supported by lower work roll bearings 26 similarly to the upper work roll l.

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 1 during rolling. In order to prevent this, the upper support roll 6 is moved against the reaction force of the upper work roll l.
The guide rail 22 is provided adjacent to the guide rail 22 so as to provide a stable rolling force in the radial direction.

Reference numeral 33 designates a backup shaft, and both ends thereof are supported by backup shaft bearings 38 installed between housings 10 erected on both sides of the rolling mill 20 .

Next, the upper support roll adjustment device 19 and the lower support roll adjustment device 21 of the present invention will be explained.

Note that the upper support roll adjustment device 19 in the present invention
is disposed above the upper work roll l, and the lower support roll adjusting device 21 is disposed below the lower work roll 2. The upper support roll adjusting device 19 includes an upper support roll 6, a support roll bearing 11, and a cylinder 14 for moving the support roll.

A pair of upper support rolls 6 having a circular shape are rotatably supported by support roll bearings 11 on support shafts 6a, respectively, and during rolling, the outer peripheral surfaces of the upper support roll 6 and the upper work roll l contact each other. are in contact with each other and rotating in opposite directions. Further, depending on the width dimension and plate shape of the plate material 5, protrusions are provided on the outer wall of the housing IO so that the position of the upper support roll 6 can be easily moved in the axial direction along the outer peripheral surface of the upper work roll 1. A support roll moving cylinder 14 is disposed in this manner.

The support roll moving cylinder 14 and the support roll bearing 11 are the support roll moving cylinder rod 14.
The upper support roll 6
When moving the upper work roll L in the axial direction, if appropriate pressure oil is supplied to the support roll moving cylinder 14 (not shown), the support roll bearing 11 having the upper support roll 6 moves forward along the guide rail 22.・It is designed to slide so that it can be retreated.

The lower support roll adjustment device 21 also includes a lower support roll 18, a support roll bearing 41. It is composed of thrust bearings 42, 43, thrust bearing supports 44, 45, a casing 46, a guide rod 47, a moving screw 48, and an electric motor 49.

A pair of lower support rolls 18 having a circular shape are rotatably supported on the upper work roll l by support roll bearings 41, and during rolling, the lower support rolls 18 and the outer peripheral surfaces of the lower work roll 2 and are rotating in opposite directions while in contact with each other. Thrust bearing 4
2.43 receives the thrust force generated on the lower support roll 18 during rolling.

In addition, the positions of the pair of lower support rolls 18 can be moved toward or away from each other in the axial direction along the outer peripheral surface of the upper work roll 1 according to the width dimension and shape of the plate material 5. It is arranged. As shown in FIG. 5(b), a screw groove is cut in the center area of the casing 46 in which the lower support roll 18 is held, and is inserted in the moving direction of the lower support roll 18. Both ends of the moving screw 48, which is inserted and meshed with the screw groove of the inner hole 46, are rotatably supported by a backup shaft bearing 38 provided inside the housing 10. Moving screw 48 inserted through casing 46
A guide rod 47 is provided on both sides of the housing 10, and is stretched and held between a pair of upright housings 10.

The moving screw 48 is divided into a right screw and a left screw from the center in the axial direction to the left and right. An electric motor 49 is directly connected to one end of the moving screw 48, and the pair of lower support rolls 18 can be moved toward and away from each other by rotating the electric motor 49 in the forward or reverse direction. Electric motor 49 depending on dimensions
It is possible to adjust the distance between the lower support rolls 18 as appropriate by rotating the lower support rolls 18.

Reference numeral 9 denotes a roll-pending device, which includes an upper roll-pending rod 9a, a lower roll-pending rod 9b, and a roll-pending cylinder 9C.
and a piston 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 come into contact with and separate from the lower work roll bearing 26.

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 tip of each of the upper and lower work roll bearings 25.
26 will be pressed.

At the time of suppression, a liner 9f is attached to the upper and lower work roll bearings 25.26 side of the outer peripheral wall of the roll pending cylinder 9C, and the liner 9f is attached to the upper and lower work roll bearings 25.2.
Since the liner 9g is attached to the outer peripheral surface of the roll pending cylinder 9C side of No. 6, both liners 9f
, 9g, the upper and lower work roll bearings 25.26 are pushed upward and downward, respectively, and the upper and lower support rolls 6.18
The bending moment is likely to act on the contact surfaces of the upper and lower work rolls 1.2 as fulcrums, and the profile of the small diameter upper work roll 1 having a flat shape is corrected during rolling, resulting in a convex shape. The profile of the lower work roll 2 is configured from a concave 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, a pressure oil supply device (not shown) is provided. When pressure oil is introduced into the reduction cylinder from , as the reduction cylinder head 8a rises, the tip of the reduction cylinder head 8a contacts and presses the lower part of the backup shaft bearing 38, pushing the backup shaft 33 upward. The rolling force is applied as a correction rolling force to the strip material 5a via the lower work roll 2 which rotates in the opposite direction while contacting the lower work roll 2 via the lower support roll 18.

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

Before rolling the plate material 5, the positions of the upper and lower support rolls 6.18 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 1 and the lower work roll 2. When passing between the pair of upper and lower work rolls 1 and 2, the plate material 5 is rolled into a strip material 5a having a desired upper and lower flat surface. 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

In order to obtain the desired shape of the strip material 5a, the upper and lower support rolls 6.18 are slid back and forth in the axial direction of the upper and lower work rolls 1.2, and the upper and lower roll pending rods are 9a
, 9b, the ear waves (strip material 5
It is possible to prevent the strip material 5a from being thick at the center and thin at both ends) and elongation in the middle (where the strip material 5a is thin at the center and thick at both ends).

FIG. 7 shows test results summarizing how the profiles of the upper and lower work rolls 1.2 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 7 shows a roll diameter of 600 mm, a rolling force of 600 TON,
The distance between the upper support rolls 6 is set to 1400mm,
The change in the profile of the upper work roll 1 when the roll pending force is adjusted from OTON to 125TON is shown.

Figure 8 shows a roll diameter of 600 mm and a rolling force of 600 TON.
, shows changes in the profile of the upper work roll 1 when the distance between the upper support rolls 6 is set to 1600 mm and the roll pending force is adjusted from OTON to 1257 ON.

As is clear from FIGS. 7 and 8, according to the rolling mill 20 of the present invention, the upper and lower work rolls 1.2 have a convex to concave shape depending on the pending force and the position of the support roll 6.18. It can be seen that the shape can be freely adjusted up to 100 degrees, and that it has an extremely wide range of shape control ability and crown control ability.

In the present invention, the inner ring 30 of the support roll bearing 41 attached to the backup shaft 33 through which the lower support roll 18 is inserted is moved from side to side. 33 and the inner ring 30 of the support roll bearing 41 may be moved with a gap provided therebetween.

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, when moving the upper and lower support rolls 6.18 in the axial direction of the upper and lower work rolls 1.2, the electric motor 49 for moving the support rolls was used as a drive source, but a hydraulic cylinder, etc. Other transportation means may also be used.

Furthermore, although the case has been described in which the diameters of the upper and lower work rolls 1.2 are unchanged in the axial direction, similar results can be obtained even if crown-shaped rolls with a slight center height are used.

Further, in the present invention, the lower support roll, the upper work roll, the lower work roll, and the upper support roll may be arranged in this order from the top to the bottom.

[Effects of the Invention] As is clear from the above description, according to the present invention, the upper support roll, the upper work roll, the lower work roll, and the lower support roll are arranged in this order from above to below, and the upper work roll and The diameter of the lower work roll remains unchanged in the axial direction of the roll, and each of the upper outer circumferential surface of the upper work roll and the lower outer circumferential surface of the lower work roll has a circular cross section and is located outside the width of the plate material. A pair of support rolls are rotatably arranged in contact with each other, and the upper support roll is arranged at the tip of the piston rod engaged with the cylinder via a support roll bearing, and is moved forward in the axial direction of the upper work roll.・By arranging the lower support roll so that it can freely move backward and forward in the axial direction of the lower work roll, which is inserted into the backup shaft that is suspended between the housings that house the bearings, the upper support roll And since the profile of the lower work roll can be controlled reliably, easily and quickly over a wide range, rolling and modification of the plate material can be easily carried out. 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 support rolls are needed, greatly improving product cycles. do. Also, depending on the shape of the product plate, the position of the support roll and the amount and pressure of working fluid introduced into the roll pending cylinder engaged with the roll pending rod are controlled, and the upper and lower work rolls and support rolls are controlled. By pushing and bending the upper work roll upward using the respective contact surfaces as fulcrums, and pushing and bending the lower work roll downward using the contact surfaces of the lower work roll and support roll as fulcrums, the upper work roll The profile of the work roll and the lower work roll can be easily changed, and accordingly, rolling and modification of the plate material can be done easily and quickly.

In addition, conventionally, the entire surface of an expensive backup roll was polished every time it was used, but in the present invention, only the support roll portion needs to be polished, which greatly reduces the polishing time and reduces work time. .

Furthermore, if the support roll is always located outside the width of the board, even if there is a slight scratch on the support roll, it will not be transferred to the board, so there is no need to polish the support roll.

[Brief explanation of drawings]

Figures 1 to 8 show one embodiment of the present invention, with Figure 1 being a front view of a four-high rolling mill, Figure 2 being a side view taken from ■-■ in Figure 1, and Figure 3 being a side view of a four-high rolling mill. FIG. 4 is an enlarged cross-sectional view of the main parts of the rolling mill seen from IV-IV in FIG. 2, and FIG. 5(b) is a side sectional view taken from A-A in FIG. 5(a), and FIG. 6 is a roll pending device seen from Vl-Vl in FIG. 4. 7 and 8 are enlarged cross-sectional views of essential parts, and show profiles related to control of rolling rolls of a four-high rolling mill to which the present invention is applied. Moreover, FIGS. 9 to 14 show a conventional example similar to the present invention, in which FIG. 9 is a front view of a four-high rolling mill, FIG. Fig. 11 is an enlarged cross-sectional view of the main parts of the rolling mill seen from the cutting edge in Fig. 10, Fig. 12 is an enlarged sectional view of the roll pending cylinder seen from the cutting edge in Fig. 11, and Fig. 13 is an exaggerated view. FIG. 14 is a schematic diagram showing the increase and decrease of the crown. 1... Upper work roll, 2... Lower work roll, 3... Upper backup roll, 4...
・Lower backup roll, 5...Plate material,
5a... Strip plate, 6... Upper support roll, 8... Reduction cylinder, 9... Roll pending device, 11...
... Support roll bearing, 13 ... Upper joint material, 14 ... Support roll movement cylinder, 18
...Lower support roll, 19...Upper support roll adjusting device, 20-...Rolling mill, 21...Lower support roll adjusting device, 25.
...Upper work roll bearing, 26...Lower work roll bearing, 27...Upper backup roll bearing, 28...Lower backup roll bearing, 38...・・・Backup shaft bearing,
47... Guide rod, 48... Moving screw, 49... Electric motor. Patent applicant: Ube Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4 q Figure 5 (b) Figure 6 Figure 7 Figure 8 Radius of strip material (mm) Figure 9 Figure 10° Figure 11 Figure 12

Claims (1)

[Claims] (1) An upper work roll bearing that supports the upper work roll and 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, facing each other, and supporting the upper work roll, and a lower work roll. Lower work roll bearings that support the rolls are arranged at both ends of the upper work roll and the lower work roll, and a roll pending cylinder is arranged between the upper work roll bearing and the lower work roll bearing, and the roll pending cylinder is arranged between the upper work roll bearing and the lower work roll bearing. An upper roll pending rod that engages with the upper work roll to press the upper work roll upward, and a lower roll pending rod that presses the lower work roll downward are respectively disposed, and a plate material is passed between the upper work roll and the lower work roll. In a rolling mill that obtains rolled strip material, the upper support roll, upper work roll, lower work roll, and lower support roll are arranged in this order from above to below, and the diameters of the upper work roll and lower work roll are aligned with the axis of the roll. Each pair of support rolls, which are fixed in the direction, have a circular cross section on the upper outer circumferential surface of the upper work roll and the lower outer circumferential surface of the lower work roll, and are located outside the width of the plate material, are rotatable. The upper support roll is arranged in contact with the cylinder, and the upper support roll is arranged at the tip of the piston rod engaged with the cylinder via a support roll bearing. A rolling mill characterized in that a moving means is provided that can freely move forward and backward in the axial direction of a rear lower work roll, which is inserted through a backup shaft that suspends the roll between housings that accommodate bearings.