JPH0629704U - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] The changing operation is easy and the positioning of the bending fulcrum is ensured. [Structure] A backup shaft which is rotatably supported by a rolling mill housing, a sleeve which is mounted so as to be slidably movable in the axial direction on the outer periphery thereof and has a hydraulic chamber built therein, and a work roll or an intermediate roll provided on the outer peripheral surface of the sleeve in the previous period. A support roll having a short body width which is brought into rolling contact with is provided, and the backup shaft and the sleeve can be fitted or loosely fitted by adjusting the hydraulic pressure in the hydraulic chamber.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used in the fields of iron and steel and non-ferrous metals, and is used in 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 especially for shape correction and crowning. The present invention relates to a device for making a backup when performing roll bending for correction.

[0002]

[Prior art]

 Generally, various methods have been proposed in order to control the shape of the material to be rolled. For example, a four-high rolling mill has a pair of work rolls of relatively small diameter, and a pair of work rolls arranged so as to sandwich them from the outside. And a backup roll having a relatively large diameter, both of which are formed to have substantially the same cylinder length so as to make rolling contact over the entire length, and a bending cylinder is mounted between the bearings of the work roll.

A strip material having a desired plate thickness is obtained by passing the material to be rolled through such a rolling mill. However, as the material to be rolled passes, the central portion of the work roll is expanded, Since the material to be rolled has a so-called middle-height cross-sectional shape with a thick central part and thin side edges, a crown is formed on the backup roll and the bending cylinders act to expand the work roll necks mutually. The work roll is adjusted in such a way that the pressure lower surface of the work roll becomes flat, and shape control is performed to correct the crown generated in the material to be rolled.

[0004]

[Problems to be solved by the device]

 However, in the above conventional rolling mill, since the work rolls and intermediate rolls are constrained on the entire surface of the backup rolls, it is difficult to give sufficient roll bending to the work rolls, and the absolute ability of shape control is lacking. Not only that, but especially in a four-high rolling mill, there is a drawback in that it is necessary to change the backup roll to change the crown shape depending on the strip width, strength, shape, etc. of the material to be rolled. In addition, since the work roll and the backup roll rolling on the intermediate roll come into full contact with each other, the backup fulcrum cannot be changed arbitrarily and the shape cannot be controlled at any position. Moreover, it is necessary to polish the entire surface of the backup roll in terms of maintenance, and there is a drawback in that sufficient space space is required on the side of the rolling mill due to the difficulty of maintenance and the shift mechanism of the intermediate roll.

An object of the present invention is to pay attention to the above-mentioned conventional problems, and to have a quick response to a condition that is constantly changing in high-speed rolling, and to significantly increase the work roll bending control amount. A rolling mill that can quickly set the roll bending fulcrum in the strip width direction of the material to be rolled to an arbitrary position to have a good shape control function, and can easily perform the changing operation and ensure the positioning of the bending fulcrum. To provide a back-up roll device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a backup roll device for a rolling mill according to the present invention comprises a backup shaft rotatably supported by a rolling mill housing, an outer periphery of the backup shaft which is slidably movable in an axial direction, and a hydraulic chamber. A pair of support rolls with a short body width are provided on the outer peripheral surfaces of a pair of built-in sleeves and are in rolling contact with a work roll or an intermediate roll, and backup oil is adjusted by adjusting the pressure oil to the hydraulic chamber. The shaft and the sleeve can be fitted or loosely fitted together.

[0007]

[Action]

 According to the above configuration, the function of each back-up roll that suppresses the work roll deflection that directly rolls down the material to be rolled is that the pair of support rolls that are rolled on the work roll or the intermediate roll and separated in the roll axial direction It is demonstrated by the attached back up shaft and supports the work roll rolling force. A pair of axially movable sleeves are provided on the outer peripheral surface of the backup shaft. Further, a separation support roll is provided on the outer peripheral surface of each sleeve. The bending moment fulcrum is changed by moving the position of the separating support roll, and the amount of roll bending can be adjusted by the bending means provided on the work roll neck or the intermediate roll neck. Therefore, the overall amount of bending is controlled by the position movement of the support roll, the shape of the rolled material such as the crown can be controlled, and the bending moment fulcrum can be changed arbitrarily, so that the shape control ability is greatly improved. Improve to.

Particularly, in this invention, a hydraulic chamber is provided in the sleeve, and by adjusting the pressure in the hydraulic chamber, the gap between the sleeve and the backup shaft and the gap between the sleeve and the separation support roll can be adjusted. It is possible to facilitate the axial movement of the support roll and to reliably position the support roll by fitting or loosely fitting. In this case, regardless of the position of the support roll, a uniform fixed load is applied to the inner peripheral surface of the support roll, and the support roll can be stably held, thereby reliably setting the bending fulcrum. be able to.

Here, in order to move the position of the support roll, a guide rod is provided in parallel with the backup shaft, and a bracket-shaped guide member for holding each support roll is not interfered with the backup shaft. The guide members can be moved by attaching them to the. The pair of guide members may be driven simultaneously in the direction of approaching or moving apart in accordance with the plate width of the material to be rolled, but they can also be moved independently. As a driving method, a suitable method such as a method using a screw rod or a method using a hydraulic cylinder can be adopted.

[0010]

【Example】

 Hereinafter, a specific embodiment of a backup roll device for a rolling mill according to the present invention will be described in detail with reference to the drawings.

4 to 5 show the overall configuration of a rolling mill including a backup roll device according to the embodiment. In this rolling mill, as shown in the drawing, a pair of upper and lower work rolls 21 and 22 which are parallel to a gate-shaped housing 20 are horizontally mounted so as to be capable of rolling contact with each other. It is possible. A pair of intermediate rolls 24 and 26 which are in rolling contact with the upper and lower work rolls 21 and 22 in parallel with each other so as to sandwich them from above and below are horizontally mounted on the housing 20. The intermediate rolls 24 and 26 are formed to have a diameter larger than that of the work rolls 21 and 22 to transmit the rolling force. Especially, the body length is set to be equal to or larger than the plate width of the material 23 to be rolled, and The work rolls 21 and 22 are set to be shorter than the body length. Therefore, when the intermediate rolls 24 and 26 are in full contact with the work rolls 21 and 22 in the state of being assembled in the housing 20, the end portions of the work rolls 21 and 22 are, as shown in FIG. It is set so as to protrude from the end of 26 by a predetermined length.

In addition to such a row of rolls, an upper backup roll device 28 and a lower backup roll device 30 are also laid horizontally in parallel so that the intermediate rolls 24 and 26 are sandwiched between them. .

The upper backup roll device 28 has a back-up shaft 32 arranged in parallel with the intermediate roll 24, which is separated into right and left in the roll axial direction and has a body length shorter than the plate width of the material 23 to be rolled. A pair of formed support rolls 34R, 34L are attached so as to be slidably movable in the axial direction. The pair of support rolls 34R, 34L are rolled on the upper intermediate roll 24 and serve as a backup support for the work roll 21 and the intermediate roll 24 during rolling. Similarly, the lower back-up roll device 30 also has a backup shaft 36 and a pair of left and right support rolls 38R and 38L attached to the backup shaft 36. I am trying to provide backup support.

As shown in FIG. 5, the neck portions of the upper and lower work rolls 21 and 22 and the intermediate rolls 24 and 26, and the neck portions of the backup shafts 32 and 36 of the upper and lower backup roll devices 28 and 30, as shown in FIG. Bearings 46, 47, 48, 49, 50, 52 are mounted and mounted in the housing 20 in tandem. Further, a rolling-down cylinder 54 is provided at a lower position of the housing 20, and a predetermined rolling pressure is generated between the work rolls 21 and 22 by driving the rolling-down cylinder 54.

A specific configuration of the backup roll device 28, 30 according to the present embodiment in such a rolling mill will be described with reference to FIGS. 1 to 3. 1 is a partially cut front view of the upper backup roll device, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a main part of the upper backup roll unit. FIG. 1 shows an upper backup roll device 28. Separation support rolls 34R, 34L of this device 28 are attached to taper sleeves 1R, 1L to adjust the pressure oil in the hydraulic chambers in the sleeves 1R, 1L. By this, the position can be adjusted by slidingly moving the backup shaft 32 in the axial direction while adjusting the clearance between the sleeves 1R and 1L and the backup shaft. For this position movement, the roll guides 56R and 56L as driving members are engaged with the sleeves 1R and 1L.

Two parallel 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 mounting the backup shaft 32 and the guide shaft 58 on the common bearing 50, the parallelism between the shafts 32, 58 is maintained. The roll guides 56R and 56L are attached to the guide shaft 58. The slide guides 60R and 56L penetrate the guide shaft 58 and are formed so as not to interfere with the sleeves 1R and 1L and the support rolls 34R and 34L. , 60L. The slide casings 60R and 60L are extended toward both end surfaces of the sleeves 1R and 1L, and a pair of sleeve casings 1R and 1L are provided so as to straddle the end surfaces of the sleeves 1R and 1L so that they can contact the end surfaces of the sleeves 1R and 1L. Supports 62, 64 are attached. Each of the supports 62 and 64 is formed in a bifurcated manner so as not to interfere with the backup shaft 32, and the slide casings 60R and 60L are moved to press the end surfaces of the sleeves 1R and 1L, thereby supporting them in the axial direction. The rolls 34R and 34L can be moved. Such a configuration is also the same in the lower backup roll device 30.

Here, a drive means for appropriately moving the position of the support rolls 34R, 34L, 38R, 38L is provided for each backup roll device 28, 30. This is because the position of the pair of separation support rolls 34R, 34L (38R, 38L) is set along the outer peripheral surface of the intermediate roll 24 (26) in the axial direction depending on the width dimension of the material 23 to be rolled and the plate shape. To approach or separate from. The upper back-up roll device 28 will be described as a representative. As shown in FIG. 1, a pair of screw rods 70R positioned in the middle of the pair of guide shafts 58 and rotatably supported by the bearings 50 at both ends. , 70L, which are threadedly inserted into the slide casings 60R, 60L of the left and right roll guides 56R, 56L, respectively. In this embodiment, one screw rod 70R is screwed into the right slide casing 60R, and the other screw rod 70L is screwed into the left slide casing 60L, whereby the screw rods 70R can be individually moved in the axial direction. It is like this. The drive motors 72R, 72L for rotationally driving the screw rods 70R, 70L are attached to one bearing 50 of the backup shaft 32 so as to give a predetermined rotation to the screw rods 70R, 70L.

Of course, a single screw rod configuration may be used, and the screw may be cut into a reverse screw with the central portion sandwiched therebetween so that the coaxial support rolls 38R and 38L are simultaneously moved toward or away from each other. In this case, the screw fitting portions of the slide casings 60R and 60L also have a reverse female screw structure adapted to the screw of the screw rod. Therefore, when the screw rod is rotated, the roll guides 56R and 56L screwed to the screw rod are moved toward or away from each other.

As described above, the pair of sleeves 1R and 1L are slidable along the backup shaft 32. In order to allow their movement and to position them when they move to a predetermined position, Support rolls 34R and 34L are formed on the outer peripheral portions of the sleeves 1R and 1L as follows.

As shown in FIG. 1, the backup shaft 32, the sleeves 1R and 1L, and the support rolls 34R and 34L are coaxially fitted and arranged. Inside the sleeves 1R and 1L, there are provided elongated hydraulic chambers 2R and 2L engraved in the axial direction, and it is possible to supply pressure oil from a hydraulic supply device (not shown) via a rotary joint 85. There is.

The inner diameters of the sleeves 1R and 1L are made slightly larger than the outer diameter of the backup shaft 32. The outer diameters of the sleeves 1R and 1L are made slightly smaller than the inner diameters of the support rolls 34R and 34L. When high-pressure oil is supplied to the hydraulic chambers 2R, 2L in the sleeves 1R, 1L, the sleeves 1R, 1L expand in the radial direction and the sleeves 1R, 1L are fitted to the backup shaft 32.

At the same time, the support rolls 34R, 34L and the sleeves 1R, 1L are also fitted. That is, the support rolls 34R and 34L and the sleeves 1R and 1L can be fixed to the backup shaft 32 by supplying high-pressure oil to the hydraulic chamber. The magnitude of this fitting force can be adjusted by the pressure of hydraulic oil or the like. On the contrary, by lowering the hydraulic pressure in the hydraulic chambers 2R, 2L, the fitting force acting on the support rolls 34R, 34L, the taper sleeves 1R, 1L and the backup shaft 32 is released, and each part elastically returns to its original state. It returns to the state with a gap. Reference numerals 5R and 5L indicate lock nuts.

The above-described configuration is similarly configured in the lower backup roll device 30.

A work roll bending device 110 and an intermediate roll bending device 120 are incorporated in the rolling mill housing 20. The work roll bending device 110 has an upper roll bending rod 112 and a lower roll bending rod 114, which can be brought into and out of contact with the upper work roll bearing 46 and the lower work roll bearing 47, and are bent by hydraulic pressure. I am trying to do. The intermediate roll bending device 120 has an upper roll bending rod 122 and a lower roll bending rod 124, which can be brought into contact with the intermediate roll bearings 48 and 49, respectively, to independently perform the bending action.

In FIG. 5, reference numeral 54 is a reduction cylinder 54, which is used to raise the head 130. The operation of the head 130 pushes up the back-up shaft bearing 52 of the lower backup roll device 30, and the reduction force is the lower support rolls 38R and 38L, the lower intermediate roll 26, the lower work roll 22, the upper work roll 21, and the upper intermediate roll. 24, the upper support rolls 34R and 34L, the upper backup shaft bearing 50, and the housing 20 to transmit a desired rolling force.

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

Before rolling, the positions of the support rolls 34R, 34L and 38R, 38L are determined in advance according to the width of the material 23 to be rolled. Next, the pressure in the hydraulic chambers 2R, 2L is set to a low pressure, the sleeves 1R, 1L are freed from the backup shafts 32, 36, the roll guides 56R, 56L are moved left and right by the drive motors 72R, 72L, and the support rolls 34R, 34L, 38R and 38L are moved to arbitrary positions on the backup shafts 32 and 36. After moving to the predetermined position, the pressure in the hydraulic chambers 2R, 2L is set to a high pressure to immovably fix the sleeves 1R, 1L to the backup shaft 32, and the support rolls 34R, 34L also move to the sleeves 1R, 1L. Fixed. As a result, the interval between the pair of upper and lower support rolls 34R, 34L and 38R, 38L is set to a desired interval.

After this initial setting is completed, the rolled material 23 is passed between the work rolls 21 and 22. As a result, the material 23 to be rolled is rolled to a desired plate thickness and emerges as a strip material. This shape determination is performed visually or by a contact method using a sensor roll or a non-contact method using light or magnetism. If ear or middle stretch occurs due to this determination, the support rolls 34R, 34L and 38R, 38L are moved to positions close to or away from each other, and the work rolls 21 through the intermediate rolls 24, 26, It is possible to obtain a rectangular strip material by adjusting the amount of bending moment acting on 22 to control the occurrence of abnormal shape. At this time, since the bending amount of the intermediate rolls 24, 26 is controlled by adjusting the bending force of the intermediate roll bending device 120, the interaction with the position movement amounts of the support rolls 34R, 34L and 38R, 38L is controlled. This makes it possible to exert a large shape correction function. That is, the correction area can be adjusted by moving the positions of the support rolls 34R, 34L and 38R, 38L, and the correction amount can be adjusted by the intermediate roll bending device 120.

When the rolled material 23 has edge drops, the bending force of the work rolls 21 and 22 by the work roll bending device 110 is controlled. Since both ends of the work rolls 21 and 22 are protruded from the intermediate rolls 24 and 26, by supplying pressure oil to the work roll bending device 110, the rods 112 and 114 are protruded from the end edges of the intermediate rolls 24 and 26. The protruding part is largely bent mainly and acts to control the edge drop. Of course, since the work rolls 21 and 22 also have rigidity, the bending force is transmitted to the intermediate rolls 24 and 26.

According to the rolling mill equipped with the backup roll devices 28 and 30 of the above embodiment, the bending fulcrums of the work rolls 21 and 22 or the intermediate rolls 24 and 26 can be freely changed, so that the conventional full contact type The roll bending effect can be fully exerted without being restricted by the backup rolls. Further, since the positions of the upper and lower support rolls 34R, 34L and 38R, 38L can be individually changed, the shape can be controlled at any position in the plate width direction. Therefore, in addition to shape defects such as medium elongation and edge elongation of the material to be rolled, it is possible to obtain an advantage that it is possible to control not only the shape defect of composite elongation that is a composite of the two.

In addition, in the above-mentioned embodiment, an example in which it is applied to the 6-high rolling mill provided with the intermediate rolls 24 and 26 is shown, but it can be applied to the backup roll of the 4-high rolling mill shown in FIG. 6 (1). It is also applicable to the work rolls 21 and 22 having a larger diameter than the intermediate rolls 24 and 26 as shown in FIG. Further, it can be applied to the backup rolls of the cluster rolling mill as shown in FIGS. 3 (3) and 4 (4). Of course, although not shown, it is needless to say that the present invention can be applied to any rolling mill having other special structure, such as a rolling mill having the backup roll device of the embodiment only on the upper portion.

Further, in the above embodiment, the hydraulic oil is supplied to the hydraulic chambers 2R, 2L, but the hydraulic oil is not limited to the hydraulic oil, and gas such as gas or other pressure medium may be used. Further, in the above embodiment, an example of application of the pair of support rolls 34R, 34L and 38R, 38L is shown, but the present invention is not limited to this, and three or four support rolls 34R, 34L are equally distributed on the upper or lower part, respectively. You may set it up. Further, although the intermediate roll bending and the work roll bending are used together in this embodiment, only the work roll bending or the intermediate roll bending may be operated. Further, the sleeves 1R, 1L and the support rolls 34R, 34L, 38R, 38L may be shrink-fitted from the beginning.

[0033]

[Effect of device]

 As described above, the backup roll device for a rolling mill according to the present invention includes a backup shaft that is rotatably supported by the rolling mill housing, is mounted so as to be slidably movable in the axial direction on the outer periphery thereof, and has a built-in hydraulic chamber. A pair of short-width support rolls, which roll on the work roll or intermediate roll, are provided on the outer peripheral surfaces of the pair of sleeves, and the backup shaft and the sleeve are adjusted by adjusting the pressure oil to the hydraulic chamber. By adopting a configuration in which the spaces can be fitted or loosely fitted, the support roll can be reliably positioned and the support roll can be easily moved in the axial direction. Moreover, regardless of the position of the support roll, a uniform fixed rolling load is applied to the inner peripheral surface of the support roll, and the support roll can be held stably, which ensures that the bending fulcrum is set. You can

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of a backup shaft device for a rolling mill according to an embodiment.

FIG. 2 is a side view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view of an essential part of an upper backup roll unit.

FIG. 4 is a front view of a rolling mill equipped with the backup roll device of the embodiment.

FIG. 5 is a side view of FIG.

FIG. 6 is an example of another rolling mill in which the backup roll device according to the embodiment can be mounted.

[Explanation of symbols]

 1R, 1L Sleeve 2R, 2L Hydraulic chamber 20 Housing 21, 22 Work roll 24, 26 Intermediate roll 23 Rolled material 28, 30 Backup roll device 32, 36 Backup shaft 34R, 34L, 38R, 38L Support roll 46, 47, 48 , 49, 50, 52 Bearing 54 Roll-down cylinder 56R, 56L Roll guide 58 Guide shaft 60R, 60L Slide casing 70R, 70L Screw rod 72R, 72L Drive motor 110 Work roll bending device 120 Intermediate roll bending device

Claims (1)

[Scope of utility model registration request] 1. A work roll on the outer peripheral surface of a backup shaft which is rotatably supported by a rolling mill housing, and a pair of sleeves which are mounted so as to be slidably movable in the axial direction on the outer periphery of the backup shaft and contain a hydraulic chamber. Alternatively, a pair of short-body-width support rolls rollingly contacting the intermediate rolls are provided, and the backup shaft and the sleeve can be fitted or loosely fitted by adjusting pressure oil to the hydraulic chamber. Backup roll device for rolling mill.