JPH0619901U - Rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] In crown control by work rolls,
In addition to having a wide range of control functions, it has a quick response to the conditions that change rapidly in high-speed rolling, and greatly increases the amount of deflection control by work rolls. [Structure] A pair of support rolls 34R, 34L having a short body length in which the upper backup roll is separated in the roll axial direction.
And can be rotated by the backup shaft 32,
And it is attached so that it can slide in the axial direction. These are engaged with guide members 56R and 56L that are movable in the roll axis direction, and the guide members are directly connected to each other by a fluid pressure drive means. By operating the fluid pressure drive means to expand and contract, the guide members move toward and away from each other, the spacing between the support rolls can be adjusted arbitrarily, and the diameter of the lower backup roll 30 does not change in the axial direction. , Larger than 24 diameters.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is used in the field of iron and steel industry and non-ferrous metals, and relates to a rolling mill for passing a plate material such as a steel plate between rolls to perform plastic deformation to obtain a desired plate thickness, and particularly to shape correction and crown correction. A rolling mill provided with means.

[0002]

[Prior art]

 A conventional four-high rolling mill is shown in FIGS. This type of rolling mill is equipped with a pair of work rolls 1 and 2 with a relatively small diameter and backup rolls 3 and 4 with a relatively large diameter that are arranged so as to sandwich these work rolls from the outside. It is formed into a body length and rolls over the entire length, and both necks of the rolls 1, 2, 3 and 4 are supported by bearings 5, 6, 7 and 8 and are mounted in a housing 9. ing. Further, a reduction cylinder 10 is attached to the housing 9, and a reduction force is applied between the work rolls 1 and 2 by reducing the pressure between the bearings 5 to 8 arranged in series.

A strip material having a desired plate thickness is obtained by passing the material to be rolled 11 between the work rolls 1 and 2 of such a rolling mill. The central part of 2 expands, and so-called roll bending occurs in which the passage center side of the rolled material 11 bulges outward from the bearings 5 and 6 on both ends. For this reason, the backup rolls 3 and 4 have a crown shape so as to absorb the roll bending of the work rolls 1 and 2.

However, even when the backup rolls 3 and 4 with crowns are used, the roll bending amount is not uniquely determined due to the properties of the material 11 to be rolled, the difference in the amount of reduction, etc. In addition, there is a difference (= H−h) between the edge thickness h and the central thickness H of the rolled material 11, and the cross-sectional shape of the strip material after rolling has a so-called edge extension on both side edges. The resulting drum-shaped cross section will occur. For this reason, various proposals have been made to obtain strip materials with a rectangular cross section.

A roll bending method is known as a conventional crown control method. In this method, a bending cylinder is attached to the roll neck, and the pressing surface of the work roll is controlled to be flat so that the elastic deformation of the roll crown and the work roll is cancelled, and the crown is corrected. That is, as shown in FIG. 11, a double rod type bending cylinder 12 is disposed between the bearings 5 and 6 mounted on the necks of the work rolls 1 and 2, and the cylinder 12 is expanded and contracted to expand and contract both bearings 5. , 6 can be adjusted, and the crown to be generated in the rolled material 11 is corrected according to the bending amount. This is a work roll bending method, but there is also a backup roll bending method.

[0006] Further, a VC roll method in which an oil chamber is provided in a rolling roll and a hydraulic pressure acting on the oil chamber is adjusted to change the crown of the work roll, or a heat crown method in which the work roll is partially heated and expanded to change the crown. Alternatively, a method is known in which the amount of roll coolant applied is partially adjusted to adjust the amount of expansion.

[0007]

[Problems to be solved by the device]

 However, according to the roll bending method, although the work rolls 1 and 2 are highly responsive and flexible, as shown in FIGS. 14 and 15, the work rolls 1 and 2 are bound to the entire surfaces of the backup rolls 3 and 4. Therefore, it is difficult to give sufficient deflection to the work rolls, and not only the absolute capacity is lacking but also it is necessary to change the crown shape by changing the backup roll depending on the strip width, strength, shape, etc. of the material to be rolled. There are some drawbacks.

Further, the VC roll method is expensive due to the complicated work roll structure, and maintenance is also troublesome. Furthermore, the heat crown method and the roll coolant method have a problem that the response is extremely poor although they are flexible.

The object of the present invention is to pay attention to the above-mentioned conventional problems, and in particular, to have a quick response capable of coping with the condition that changes momentarily in high-speed rolling, and to have a wide range of work roll crown control function. In particular, it is to provide a rolling mill capable of significantly increasing the amount of work roll deflection control.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the rolling mill according to the present invention comprises a pair of work rolls for rolling down the rolled material and a pair of backup rolls for rolling contact with each work roll, and the bearings at both ends of each roll are attached to the housing. At the same time, in a rolling mill in which a pressurizing means for adjusting the bearing spacing between the pair of work rolls and performing crown control is installed in the housing, a short cylinder length in which the one backup roll is separated in the roll axial direction is used. It is composed of a pair of support rolls and is constructed by being attached to a backup shaft that rotatably supports and axially slidably supports, and moves to a guide shaft that is arranged in parallel with the backup shaft. A guide member that is mounted so that it can be engaged with each of the separation roll bodies is attached, and the coaxial arrangement is also possible. The paired guide members are connected to each other by a fluid pressure driving means having a rod that expands and contracts along the sliding direction, and the separation roll interval coaxially arranged by the fluid pressure driving means can be adjusted. The backup roll has a shape similar to that of the above work roll and has a larger diameter than the work roll diameter.

[0011]

[Action]

 According to the above configuration, each backup roll, which suppresses the deflection of the work roll that directly rolls down the material to be rolled, is composed of a pair of support rolls separated in the roll axial direction. Supports rolling force. These separation support rolls are movable in the axial direction, and by moving their positions, the bending moment fulcrum changes, and the roll bending amount by the pressing means of the work roll neck can be adjusted. it can. Such a position movement of the separation support roll is caused by the rod expansion and contraction operation of the fluid pressure drive means that interconnects the guide members engaged with each of the pair of separation support rolls coaxially arranged in the upper backup roll. Done. That is, the distance between the pair of guide members is directly changed by expanding and contracting the rod of the fluid pressure driving means, and the distance between the pair of separating rolls engaged with the guide member is adjusted accordingly. A roll having a diameter larger than the roll diameter is arranged.

Therefore, the roll bending fulcrum set by the pair of separation support rolls is changed by the expansion / contraction operation by the fluid pressure driving means provided on the upper backup roll, and the pressurizing means interposed between the bearings of the work roll is changed. The roll bending amount can be quickly adjusted independently or in cooperation with the pressing force of the rolling support. On the other hand, in the lower backup roll, it is necessary to select the separation support roll interval according to the width dimension and shape of the material to be rolled. In addition, the lower work roll is pressed downward by the pressing means that performs crown control by adjusting the bearing spacing between a pair of work rolls and pressed against the surface of the lower back-up roll to quickly adjust the roll bending amount. The crown control during rolling can be accurately performed. In particular, since the position movement of the separation roll is directly performed by the fluid pressure drive means, the responsiveness is high and proper position control is possible, and the fluid pressure means is expanded and contracted along the sliding direction of the guide member. Since the support roll moving device is installed in a narrow space, it can be installed and the space can be effectively used.

[0013]

【Example】

 Hereinafter, a specific embodiment of the rolling mill according to the present invention will be described in detail with reference to the drawings accompanying an example in which the rolling mill is applied to a four-high rolling mill.

1 and 2 show the overall configuration of a four-high rolling mill according to an embodiment. As shown in the figure, a pair of upper and lower work rolls 22 and 24 parallel to the gate-shaped housing 20 are horizontally mounted so as to be capable of rolling contact with each other, and the rolled material 26 can be passed between them. On the back side of each of the upper and lower work rolls 22 and 24, an upper backup roll unit 28 and a lower backup roll 30 are also laid horizontally in parallel.

The upper backup roll unit 28 has a backup shaft 32 arranged in parallel with the upper work roll 22, and has a pair of support rolls 34R which are separated into right and left in the roll axial direction and have a short body length. , 34L are mounted so that they can rotate and slide in the axial direction. The pair of support rolls 34R and 34L are rollingly contacted with the upper work roll 22 and serve as a back-up support for the work roll 22 during rolling.

The lower backup roll 30 has an invariable diameter or a crown shape in the axial direction, and is adapted to be in rolling contact with the lower work roll 24 to form a backup support during rolling. The support rolls 34R and 34L are mounted on the backup shaft 32 via a rotary bearing 40, as shown in FIG. 3 and FIG. 44 are arranged and mounted.

As shown in FIG. 2, bearings 46, 48 and 50 are attached to the neck portions of the upper and lower work rolls 22 and 24 and the neck portion of the backup shaft 32 of the upper backup roll unit 28. Bearings 52 are attached to the neck portion of the lower backup roll 30 and are mounted in the housing 20 in tandem. Further, a rolling down ring 54 is installed at a lower position of the housing 20, and a predetermined rolling pressure is generated between the work rolls 22 and 24 by driving the rolling down ring 54.

In such a configuration, the separation support rolls 34R and 34L of the upper backup roll unit 28 described above can be adjusted in position by moving in the roll axial direction, and the lower backup roll 30 can be moved to the upper and lower work rolls 22 and 24. It has a similar shape and cannot be adjusted according to the width dimension and shape of the material 26 to be rolled. Roll guides 56R and 56L as guide members are engaged with the support rolls 34R and 34L to adjust the positions of the separation support rolls 34R and 34L of the upper backup roll unit 28.

3 and 4 show an example of attachment to the upper backup roll unit 28. As shown in the figure, two guide shafts 58, which are bridged between the bearings 50 at both ends of the backup shaft 32, are attached in parallel with the backup shaft 32. By attaching the backup shaft 32 and the guide shaft 58 to the common bearing 50, the parallelism between the shafts 32 and 58 is maintained. The roll guides 56R and 56L are attached to the guide shaft 58, and the slide guides 60R and 56L are formed so as to penetrate the guide shaft 58 and not interfere with the support rolls 34R and 34L. ing.

The slide casings 60R, 60L are extended to the both end faces of the support rolls 34R, 34L, and thrust bearing supports for holding the thrust bearings 42, 44 attached to the both end faces of the rolls 34R, 34L. 62 and 64 are attached. As shown in FIG. 4, the thrust bearing supports 62 and 64 are formed by a donut disc-shaped pressing plate 66 that directly contacts the thrust bearings 42 and 44, and a bracket 68 that reinforces and supports the pressing plate 66 from the outer surface. The retainer plate 66 penetrates the backup shaft 32 so as not to interfere with it. Therefore, the support rolls 34R and 34L slide the support rolls 34R and 34L in the axial direction of the backup shaft 32 as the roll guides 56R and 56L move axially along the guide shaft 58. be able to.

Here, the upper backup roll unit 28 is provided with drive means for appropriately moving the positions of the upper support rolls 34R, 34L. This is to move the positions of the pair of separation support rolls 34R, 34L toward or away from each other in the axial direction along the outer peripheral surface of the work roll 22 according to the width dimension of the material to be rolled 26 and the plate shape. A hydraulic cylinder device 80 as a pressure driving means is interposed between a pair of separating support rolls 34R and 34L and is connected to each other.

FIG. 3 shows a sectional view of the upper backup roll unit 28 equipped with the hydraulic cylinder device 80. As shown in the figure, the hydraulic cylinder device 80 incorporates a pair of pistons 84R and 84L inside the cylinder 82, and a center hydraulic chamber partitioned between the left and right hydraulic chambers 86R and 86L and the pistons 84R and 84L. 86C is formed. Rods 88R and 88L having the same axis are attached to the pistons 84R and 84L, and these rods project from the opposite end faces of the cylinder 82, respectively. To drive this, pressure oil is supplied from a pressure oil supply device (not shown), but by supplying pressure oil to the center hydraulic chamber 86C, the rods 88R and 88L are projected to the left and right hydraulic chambers 86R and 86L. Is contracted by simultaneous supply of. At this time, the left and right hydraulic chambers 86R and 86L are supplied and discharged through a common pipe so that the expansion and contraction amounts of the rods 88R and 88L are common.

The hydraulic cylinder device 80 configured as described above is attached so that the extending and contracting directions of the rods 88R and 88L are parallel to the axial directions of the guide shaft 58 and the backup shaft 32. That is, it is located between the shafts 58 and 32, and is arranged at an intermediate position between the pair of roll guides 56R and 56L. The tips of the rods 88R and 88L projecting from both end surfaces are respectively set to the roll guides 56R and 56L. It is installed by connecting to the side wall surface. Thus, by supplying hydraulic pressure to the hydraulic cylinder device 80, the rod guides 88R and 88L are expanded and contracted by the same amount, so that the roll guides 56R and 56L, and thus the pair of support rollers 34R and 34L are separated from each other. , Or can be approached.

A roll bending device 100 is incorporated in the housing 20, and as shown in FIG. 5, an upper roll bending rod 102, a lower roll bending rod 104, a roll bending cylinder 106, and a piston. It is composed of 108.

A lower end portion of the upper roll bending rod 102 is fixed to the piston 108, and an upper end portion thereof is disposed so as to be able to come into contact with and separate from the upper work roll bearing 46. On the contrary, the lower roll bending rod 104 has its upper end fixed to the piston 108 and its lower end freely contactable with and separable from the lower work roll bearing 48. A small diameter communication hole 110 is provided in the center of the cylinder 106. When pressure oil is introduced from a pressure oil supply device (not shown), the rod bending rods 102, 104 separate from each other, and the upper and lower work rolls 22, The bearings 46 and 48 of 24 are pressed against the bearings 50 and 52 of the upper backup roll unit 28 and the lower backup roll 30.

Liners 112 and 114 are attached to the sliding surfaces of the roll bending cylinder 106 and the upper and lower work roll bearings 46 and 48, respectively. The work roll bearings 46 and 48 are pushed open to make the bending moment easy to act with the contact point between the support roll 34 and the work roll 22 as a fulcrum. As a result, the work roll rolling surface profile at the time of rolling by the work rolls 22 and 24 is adjusted so as to be a flat surface.

As shown in FIG. 6, the reduction cylinder 54 has a built-in head 116, and the pressure 116 is introduced into the reduction cylinder 54 from a pressure oil supply device (not shown) at the time of rolling. I am trying to raise it. The operation of the head 116 pushes up the bearing 52 of the lower backup roll 30, and this rolling force is applied to the lower backup roll 30, lower work roll 24, bearing 48, roll bending device 90, bearing 46, upper work roll 22, upper part. It is transmitted to the support rolls 34R, 34L, the upper backup shaft bearing 50, and the housing 20 to generate a desired rolling force.

The operation of the rolling mill configured as described above is as follows.

Before rolling, the positions of the support rolls 34R and 34L are determined in advance according to the width of the material 26 to be rolled. In this case, the rolling position of the support roll 34 to the work roll 22 is set to a position where it does not overlap with the material 26 to be rolled. This initial setting first drives the reduction cylinder 54 to raise the lower backup roll 30, The work rolls 22, 24 and the support roll 34 are lightly contacted with each other. Then, after that, the hydraulic cylinder 80 for position adjustment of the support roll 34 is driven to move it to a preset position. As a result, the distance between the pair of support rolls 34R and 34L is set to the desired distance. In this state, the contact position of the support roll 34 is deviated from the rolling region of the material 26 to be rolled.

After the initialization is completed, the material 26 to be rolled is passed between the work rolls 22 and 24. As a result, the material to be rolled 26 is rolled to a desired plate thickness and comes out as a strip material, but this shape determination is performed by visual observation, a contact method using a sensor roll, or a non-contact method using light or magnetism. If the edge extension or middle extension occurs due to this determination, in the upper backup roll unit 28, pressure oil is supplied to and discharged from the hydraulic cylinder 80 mounted on the housing 20, and the rod 88R projected from both end surfaces thereof. , 88L are expanded and contracted to move the pair of support rolls 34R, 34L so as to be close to or away from each other, and in the lower backup roll 30, similar to the upper and lower work rolls 22, 24. However, by attaching a roll having a larger diameter than the upper and lower work rolls 22 and 24, the amount of bending moment acting on the work rolls 22 and 24 is adjusted to suppress the occurrence of shape abnormality, and the rectangular strip material is used. Obtainable.

7 to 8 show the experimental results of how the profiles of the upper and lower work rolls 22 and 24 change depending on the magnitude of the bending force due to the position adjustment of the support rolls 34 and 38. FIG. 7 shows changes in the profile of the upper work roll 22 when the roll diameter is 600 mm, the rolling force is 600 tons, the distance between the support rolls is 1400 mm, and the roll bending force is adjusted to 0 to 125 tons. FIG. 8 shows changes in the profile of the upper work roll 22 when the roll diameter is set to 600 mm, the rolling force is set to 600 tons, the support roll distance is set to 1600 mm, and the roll bending force is adjusted to 0 to 125 tons.

As can be understood from these results, it is found that the bending amount of the work roll can be arbitrarily changed by the roll bending force and the position of the support roll, and thus the cross-section adjustment of the strip material is possible. . Therefore, it is possible to provide crown control capability that allows shape control over a wide range.

[0033]

[Effect of device]

 As described above, according to the present invention, the crown control can be performed quickly and in a wide range by arbitrarily changing the backup support part of the work roll, and the product shape can be easily corrected. You can Particularly, in the upper backup roll unit of the present invention, the position movement of the separation support rolls, which serves as a backup during rolling, is performed by the fluid pressure driving means connected to the pair of guide members engaged with these support rolls. As a result, the position can be moved accurately and the moving speed can be increased. Also, in the lower backup roll, the lower work roll can be bent downward by the pressing means and pressed against the surface of the lower backup roll to quickly adjust the roll bending amount, so that the shape correction function can be performed quickly and the precision can be improved. The crown control by position control can be performed, and since the fluid pressure drive means is directly connected to the guide member, it can be installed in a narrow space, which is high while effectively utilizing the narrow space of the rolling mill. The effect that the crown control is possible is obtained.

[Brief description of drawings]

FIG. 1 is a front view of a rolling mill showing an embodiment of the present invention.

FIG. 2 is a side view of a rolling mill showing an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part of an upper support roll part showing an embodiment of the present invention.

FIG. 4 is a side sectional view of FIG.

FIG. 5 is a cross-sectional view of a roll bending apparatus showing an embodiment of the present invention.

FIG. 6 is a sectional view of a housing in which a bearing of a rolling mill according to an embodiment of the present invention is mounted.

FIG. 7 is a characteristic diagram of a roll deflection amount according to a position movement of a support roll showing an embodiment of the present invention.

FIG. 8 is a characteristic diagram of a roll deflection amount according to a position movement of a support roll showing an embodiment of the present invention.

FIG. 9 is a front view of a four-high rolling mill showing a conventional example.

FIG. 10 is a side view of a four-high rolling mill showing a conventional example.

FIG. 11 is a sectional view of a main part of a housing in which a bearing of a rolling mill according to a conventional example is mounted.

FIG. 12 is a sectional view of a roll bending apparatus showing a conventional example.

FIG. 13 is a schematic view showing roll bending according to a conventional example.

FIG. 14 is a schematic diagram showing an increasing state and a decreasing state of crowns showing a conventional example.

FIG. 15 is a schematic diagram of a crown increasing and decreasing state showing a conventional example.

[Explanation of symbols]

 20 Housing 22,24 Work Roll 26 Rolled Material 28 Upper Backup Roll Unit 30 Lower Backup Roll 32 Backup Shaft 34R, 34L Support Roll 40 Rotating Bearing 42,44 Thrust Bearing 46,48,50,52 Bearing 54 Reduction Roller Cylinder 56R, 56L Roll guide 58 Guide shaft 60 Slide casing 80 Hydraulic cylinder device 82 Cylinder 84R, 84L Piston 88R, 88L Rod 100 Roll bending device

Claims (1)

[Scope of utility model registration request] 1. A pair of work rolls for rolling down a rolled material and a pair of backup rolls rollingly contacting each work roll are provided, both end bearings of each roll are mounted on a housing, and a bearing gap between the pair of work rolls is provided. In a rolling mill in which a pressurizing unit for adjusting the crown and controlling the crown is installed in the housing, the one backup roll is formed by a pair of support rolls having a short cylinder length and separated in the roll axial direction, and the separation support roll is formed. Is rotatably supported and axially slidably supported on a backup shaft, and is mounted on a guide shaft arranged in parallel with the backup shaft so as to be movable in position and engaged with each of the separation roll bodies. The guide member is mounted and the sliding direction between the pair of coaxially arranged guide members is Is connected by a fluid pressure drive means having a rod that expands and contracts along the axis, and the separation roll interval arranged coaxially by the fluid pressure drive means can be adjusted, and the other backup roll has a shape similar to that of the work roll and A rolling mill characterized by having a diameter larger than the roll diameter.