JPH04200807A - Rolling mill - Google Patents

Abstract

PURPOSE:To drastically increase the controlled variable of deflection of work rolls by making the profile of a lower work roll into crown shape and combining a pair of support rolls with short barrel length. CONSTITUTION:The position movement of back-up support rolls 34R, 34L for a work roll 22 are made adjustable. Thus, accurate crown control can be executed rapidly and in a wide area. Especially, by this invention, the movement of the support rolls is done with a wrapping connector driving device and the moving speed of the interval between a pair of separated rolls which are coaxially arranged can be increased. Further, the driving part of the wrapping connector driving device can be provided in an arbitrary place by extending a wrapping means and it is especially an effective structure in the case of limitation in the height direction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in the non-ferrous field of the steel industry, and is used to make a plate material such as a steel plate into a desired thickness by passing it between rolls and plastically deforming it. The present invention relates to a rolling mill for rolling mills, and particularly to a rolling mill provided with shape correction and crown correction means.

[Conventional technology]

A conventional two-high rolling mill is shown in FIGS. 8 to 10.

In this type of rolling mill, a pair of work rolls 1.2 are formed to have approximately equal lengths and are rolled in contact over the entire length, and each
Both neck portions of the l-rues 1 and 2 are supported by bearings 5 and 6, and these are mounted on a housing 9 L7. Further, a reduction cylinder 10 is provided in the housing 9, and a reduction cylinder 10 is provided between the work rolls 1 and 2 by pressing down between the bearings 5 and 6 arranged in tandem.

The material to be rolled 1 is placed between the work rolls 1 and 2 of a rolling mill.
1 to obtain a strip material of a desired thickness.
．． 2 is widened, and a so-called roll bending occurs in which the center of passage of the rolled material 11 bulges outward from the both end bearings 5 and 6 side. As shown in Fig. 11, there is a difference (=H-h) between the end thickness (i) and the center thickness (I) of the rolled trA11, and the cross-sectional shape of the strip material after rolling is So-called ear elongation occurs on both side edges, resulting in a drum-shaped cross section.

FIG. 12 shows the results of rolling the material 11 to be rolled using a conventional rolling mill. When the diameter of the crown-shaped upper and lower work rolls 1 and 2 is 700 mm, and the rolling force F of the rolling cylinder 10 is 600 tons, the profile of the work roll 1.2 exhibits a convex deflection. Therefore, the thickness of the material to be rolled 11 is thicker at the center and thinner at the ends, so that a so-called wave-shaped slip material is rolled.

Conventionally, various methods have been developed to prevent such slip material from forming an undulating shape and to ensure that the bottom surface of the strip material is rolled flat.

Some examples are briefly summarized below.

One method is to attach crowns to the upper and lower work rolls 1 and 2 in advance. That is, in order to be able to calculate the deflection of the upper and lower work rolls 1 and 2 in advance and correct this deflection, -1 - lower work roll 1 is calculated in advance.
．． A pair of lower work rolls 1.2 with a thicker center part, a larger middle part, and a smaller one at both ends.
5. Roll neck bearings at both ends. (The roll material is rotatably supported at J, and a material to be rolled 11 of a certain thickness is passed through a gap in the body of the roll at the center called a roll barrel 7, and rolled into a strip material of a desired thickness.

During this rolling, when pressure oil is introduced from a pressure oil supply device (not shown) into the reduction cylinder 10 installed inside the housing 9, the lower workpiece 111-2 is rolled as shown in FIG.
The rolling force F that presses the roll neck bearings 6 at both ends to a force (this is the force between the upper and lower work rolls 1.2 C, which is the force that tries to roll the rolled material 11 that has been inserted) and the work rolls. Due to the reaction force R at the time of rolling + and i'ii inserted between 1 and 2, the shape of the strip material after rolling is as follows:
The difference in thickness (l-1) between the edge thickness h and the center thickness width ■1
-h) has occurred, and in the cross section cut in the direction perpendicular to the feeding direction of the rolled material 11, -L of the strip material
The bottom shape is no longer flat 1U.

In addition, as a next method, upper and lower roll neck bearings 5, (j
There is a method called the roll bending method in which a roll bending rod is attached to a bending cylinder. 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 bending method and a backup roll bending method.

9. The VC roll method, which changes the crown of the work roll by providing an oil chamber inside the rolling roll and adjusting the hydraulic pressure acting on it, and the VC roll method, which changes the crown by partially heating and expanding the work roll. Alternatively, a method is known in which the amount of expansion is determined in detail by partially adjusting the amount of roll coolant applied.

[Problems to be Solved by the Invention] However, although the roll bending method is highly responsive and flexible, the work roll is constrained by the entire surface of the backup roll, so It is difficult to give sufficient deflection, and not only does it lack absolute ability, but it also increases the focus on the width, strength, and shape of the material to be rolled! - There are disadvantages such as the need to rearrange the wheels and change the crown shape.

Further, in the VC roll method, the work roll structure becomes complicated, making it expensive and requiring troublesome maintenance. Furthermore, although the heat crown method and roll coolant method are flexible, they have a problem of extremely poor responsiveness.

An object of the present invention is to focus on the above-mentioned conventional problems, and to provide quick response that can respond to constantly changing conditions, especially in high-speed rolling, and to provide a wide range of work roll crown control functions. =An object of the present invention is to provide a rolling mill that can significantly increase the amount of work roll deflection control.

[Failure to solve the problem]

In order to achieve the above object, a rolling mill according to the present invention includes a work roll that rolls down a rolled material and a backup roll that rolls into contact with the work roll, and has bearings at both ends of each roll attached to a housing, and In a rolling mill in which a pressurizing means for adjusting the bearing interval between the work rolls and performing crown control is incorporated in the housing, the diameter measurement of the soil part work roll and the lower work roll are made the same, and the profile of the upper work roll is made to be the same. is unchanged in the axial direction, and the profile of the lower work roll has a thicker roll diameter at the center (it has a crown shape with smaller roll diameters at both ends, and the above-mentioned 8" up roll It is formed by a pair of separated sabot rolls with a short body length, and is attached to a backup shaft that rotatably supports the separated sabot 1.1 call and supports it so as to be slidable in the axial direction, and is parallel to the backup shaft. A guide member which is movably mounted and engages with the separating roll body is attached to the guide shirt 1 disposed in the guide shirt 1, and a screw rod having a counterclockwise thread is screwed into each of the pair of guide members. In cooperation with
Place the driven car on either of the pair of guide members or screw rods mentioned above, attach the driving car to the fixed side of the housing, etc., and wrap the driven car and the driving car together.6J
Rotation can be transmitted through means, and the interval between the coaxially disposed separation rolls can be adjusted.

[For production]

According to the above configuration, each backup roll that suppresses the deflection of the upper work roll that directly rolls down the material to be rolled is composed of a pair of sabot 1-rolls separated in the roll axis direction, and each of the backup rolls is partially connected to the work roll. Rotate and press the reduction blade. In the upper backup roll, the separation Zaport roll is movable in the axial direction, and by moving its position, the bending moment I and the fulcrum change.
It is possible to adjust the amount of roll bending by the pressure means of the work roll neck. The separation roll is moved in position by rotating a drive wheel attached to a fixed side of the housing, etc., which rotates the driven wheel via the winding means.

Further, the + work roll is brought into rolling contact with the + backup roll, and the diameter of the - work roll is kept unchanged in the axial direction, so that roll bending does not occur.

Further, in the upper backup roll, the driven wheel is formed into a sleeve shape, is screwed onto the screw rod, and is rotatably attached to the guide member. A pair of guide members can be moved toward or away from each other by winding and connecting one stage of windings such as the bell 1 to this sleeve-shaped driven wheel. By screwing the pair of guide members onto the screw rod in a reverse thread relationship, the pair of guide members can be moved closer to each other by the rotated screw rod.
A separation movement can be performed.

In this way, the distance between the pair of guide members is changed, and thereby the distance between the pair of separation rolls engaged with the guide members is adjusted. Therefore, the roll bending fulcrum set by the pair of separated Zaport rolls is changed,
The amount of roll bending can be quickly adjusted independently or in cooperation with the pressing force of the pressing means interposed between the bearings of the work rolls, and the crown control during high-speed rolling can be performed accurately. In particular, since the position of the separation roll is moved by the winding transmission means, it is possible to quickly and accurately control the position, and even when there is no space available for installing the position control drive unit, the winding means can be extended. You can select any location.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the rolling mill according to the present invention will be described in detail below with reference to the drawings, in which the rolling mill is applied to a two-high rolling mill.

1 and 2 show the overall configuration of a two-high rolling mill according to an embodiment. As shown in the figure, a pair of upper and lower work rolls 22, 24 parallel to the concave housing 20 are horizontally suspended so that they can roll into contact with each other, and a material to be rolled 26 can be passed between them. . The upper work roll 22 and the lower work roll 24 have the same diameter, and the diameter of the upper work roll 22 is unchanged in the axial direction, and the lower work roll 24 has a crown shape. ing. On the back side of such upper and lower work rolls 22, 24, an upper pack-up roll unit 1-28 is also horizontally suspended in parallel.

The upper backup roll unit 28 is the work roll 22
has a backup shaft 32 arranged parallel to the
A pair of support rolls 34R and 34L, which are separated into left and right sides in the roll axis direction and have short body lengths, are attached to this so that they can rotate and slide in the axial direction. The pair of support rolls 34R, 34L are in rolling contact with the upper work roll 22, and serve as a backup support for the work roll 22 during rolling. Further, the support rolls 34R, 34L are connected to the upper unit 2 as shown in FIG.
8, the rotating bearing 40
It is attached to the backup shaft 32 via a thrust ring 42, 44 on both end faces.

The neck portions of the upper and lower work rolls 22 and 24 mentioned above,
As shown in FIG. 2, bearings 46, 48, and 50 are attached to the neck portion of the backup shaft 32 of the upper backup roll unit 28, and these are connected to the housing 2.
0 in group row and installation number. A rolling down cylinder 54 is provided at the lower part of the housing 20, and by driving this, a predetermined rolling pressure is generated between the work rolls 22 and 24.

In such a configuration, the separation support rolls 34R, 34L of the above-mentioned upper backup 1 call unit 28
The position can be adjusted by moving in the direction of the roll axis. For this position adjustment, roll guides 56R, 56L as guide members are engaged with the support rolls 34R, 34L in each unit 28.

FIG. 3 shows an example of attachment to the backup roll unit 28. As shown in the figure, two guide shafts 58 are attached between the bearings 50 at both ends of the backup shaft 32 in parallel to the pack-up shirt I-32. By attaching the -C backup shaft 32 and the guide shaft 58 to a common bearing 50, the parallelism of both shafts 1-32.58 is maintained. The roll guides 56R and 56L are attached to the guide shaft 58, and the guide shaft 58 is passed through the support roll 34R134L.
The slide casing 6 is formed so as not to interfere with the
Equipped with 0R and 60L. The slide casings 60R, 60L have thrust bearings 42.44 extending toward both end surfaces of the support rolls 34R, 34L and attached to both end surfaces of the rolls 34R, 34L.
Thrust bearing supports 62 and 64 are attached to sandwich the . As shown in FIG. 3(b), the thrust bearing supports 62 and 64 each include a donut-shaped presser plate 66 that directly abuts the thrust bearings 42 and 44, and a bracket 68 that reinforces and supports this from the outside. It is formed.

The presser plate 66 passes through the backup shaft 32 without interfering with it. Therefore, each support roll 34R, 34L has a roll guide 56R, 56L, respectively.
By moving the support rolls 34R and 34L in the axial direction along the guide shaft 58, the support rolls 34R and 34L can be slid in the axial direction of the backup shaft 32.

Here, the upper and lower backup roll unit 28 is provided with a driving means for appropriately moving the positions of the double-bottom rolls 34R and 34L. This is done by changing the positions of the pair of separating thebort rolls 34R and 34L relative to the work rolls 2 and 3 according to the width machining method and plate shape of the material to be rolled 26.
2 (a hydraulic cylinder device 70 as a hydraulic drive means that is moved toward and away from the axial direction along the circumferential surface and is attached to the housing 20 and an opener that opens and closes the legs due to dirt) It is constituted by a leg link mechanism 72. That is, the upper backup roll unit 28
As shown in FIG. 3(a), the housing 2
A drum 91 as a driving wheel is installed in the center of the single beam member 0, and a motor 92 is connected to one end of the drum 91.

- On the left and right side, the guide shaft 58 passes through the slide casings 60R and 60L of the left and right 1 call guides 56R and 56L, and a screw rod 93 is similarly passed through in parallel with the slide casings 60R and 60L of the left and right 1 call guides 56R and 56L. - It is rotatably supported by a bearing 50. The screw rod 93 has reverse threads cut into the right half and the left half, and a pair of sleeve nuts 94R and 94L are screwed into each threaded portion. These sleeve nuts l-94R, 94L are attached to the screw rod through holes in the slide casings 60R, 60L.
It is rotatably attached to R and 60L, but the axial direction Q
It is attached so that it cannot be moved. Both sleeve pads 94R, 94L are extended toward the center and protrude from the end faces of the slide casings 60R, 601-, and these extensions have a boot IJ95R, which serves as a driven vehicle.
95L is integrally formed. Ropes 96R, 96L are wound between each of these pulleys 95R, 951, and the drum 91, and are rotated with the rotation of the rotary drum 91 driven by two motors. . For this reason, each sleeve nut 94R, 94L
are rotated, and apply force to the slide casings 60R360L to move them toward or away from each other along the threading direction of the screw rod 93. Along with this, the roll guides 56R, 561-1 and the pair of sabots 1
- The rolls 34R, 34L can be moved away from each other or closer to each other.

Further, the housing 20 includes a roll bending device 10.
As shown in FIG. 4, it is composed of an upper roll bending rod 102, a roll bending cylinder 106, and a piston 108.

The lower end of the upper roll bending rod 102 is fixed to the piston 108, and the upper end is arranged so as to be movable toward and away from the upper work roll bearing 46.

An introduction hole 110 is provided in the center of the cylinder 106, and when pressure oil is introduced here from a pressure oil supply device (not shown), the roll bending rod 102 connects each bearing 46 of the upper work roll 22 to the huck-up roll unit. 1-2
8 to press against the bearing 50 side.

Further, on the sliding surfaces of the roll bending cylinder 106 and the upper and lower work roll bearings 46, liners 112,
114 is attached, and when pressurized oil is supplied to the cylinder 106, it slides on this sliding surface, pushes open the work roll bearing 46, and uses the contact point between the sabot 1-1 call 34 and the work roll 22 as a fulcrum. This makes it easier for bending moments to act.

As a result, the work roll rolling surface profile during rolling by the work rolls 22 and 24 is corrected and adjusted to become a flat surface.

As shown in FIG. 5, the reduction cylinder 54 has a built-in head 116, and during rolling, the head 116 is raised by introducing pressure oil into the reduction cylinder 54 from a pressure oil supply device (not shown). I try to let them do it. The operation of the head 116 pushes up the bearing 48 of the lower work roll 24, and this rolling blade pushes up the lower work roll 24, the bearing 48.
, the roll bending device 100, the bearing 46, the L part work roll 22, the upper support rolls 34R, 34L, the upper backup shaft bearing 50, and the nozzing 20, thereby generating a desired rolling force.

The operation of a rolling mill configured like this is as follows.

Before rolling, the boat roll 34 is rolled according to the width of the material to be rolled 26.
The positions of R and 34L are determined in advance.

In this case, the work roll 22- of the boat roll 34 is
The rolling contact position of F is set to a position where it does not overlap the material to be rolled 26, but this initial setting is made by first driving the rolling down cylinder 54.
While ascending the work crawl 24, the work crawl 22
Then, rotate the rotary drum 91 for adjusting the position of the first roll 34 in the forward direction or in the reverse direction by 4 degrees, and connect the rotary drum 91 through the ropes 96R and 96L to the IJ95R.

Each time the 95I7 is rotated, it is moved to a preset position. As a result, the distance between the pair of first rolls 34R and 34L is set to a desired distance. In this state, the contact position of the roller 10-roll 34 is set so as to be away from the rolling area of the material 26 to be rolled.

After this initial setting is completed, the work roll 22°24
A material to be rolled 26 is passed between the two. As a result, the rolled material 26
is rolled to the desired thickness and released as strip material,
This shape determination is performed visually, by a contact method using a sensor roll, by using light or magnetism, or by a non-contact method. If edge elongation or middle elongation occurs as a result of this determination, the rotary drum 91 attached to the housing 20 is rotated to rotate the sleeve collar 1-, the slit J, and the uron 1'.

In this operation, the paired Zabo-Troll 34R,3
4I- are moved close to each other or away from each other, so the amount of bending [-men 1-] that acts on the work roll 22 is adjusted to suppress the occurrence of shape abnormalities 1,
A rectangular strip of material can be obtained.

FIGS. 6 and 7 show experimental results of how the profile of the upper work roll 22 changes depending on the magnitude of the pending force caused by adjusting the position of the upper F roll 34.

Figure 6 shows a rolling force of 600 mm and a rolling force of 600 mm.
n, Zabo 1 - Shows the change in feel of the work roll 22 when the distance between the rolls is set to 1400 mm and the roll pending force is adjusted from 0 to 125 tons.

Figure 7 shows roll diameter 600TIIIT1. Rolling force 600
This figure shows changes in the profile of the soil 4-part work roll 22 when the distance between the top I and the roll is set to 1600 m+ and the roll pending force is adjusted from 0 to 125 tons.

As can be understood from this result, the roll pending force and the position of the boat roll? - It has been found that this allows the amount of deflection of the work roll to be changed arbitrarily, thereby making it possible to adjust the cross section of the strip material. Therefore, it is possible to provide a crown control ability that allows shape control over a wide range.

Incidentally, in the tenth embodiment, the winding means is constituted by a lobe, but it goes without saying that a bell 1, a chain, etc. can also be used.

〔Effect of the invention〕

As explained above, according to the present invention, quick and wide range control can be performed by arbitrarily changing the position of the work roll.
1. Modifications to the product shape can be realized very easily.

In particular, in the present invention, the position of the separation support rolls that serve as backup during rolling is moved by a winding transmission device, and the distance between the pair of separation rolls arranged coaxially can be adjusted, so that the position can be moved accurately. can be set. Moreover, the movement speed can be increased, so
The shape correction function can be performed quickly, and crown control can be performed using precise position control. Furthermore, the drive section of the winding transmission device can be installed at any location by extending the winding means, and this structure is particularly effective when there is a height restriction.

[Brief explanation of the drawing]

Fig. 1 is a front view of the rolling mill according to the embodiment, Fig. 2 is a side view thereof, Fig. 3(a) is an enlarged cross-sectional view of the main part of the upper sabot roll section, and Fig. 3(b) is the same figure. Side sectional view of (a), 4th
The figure is a cross-sectional view of the roll bending device, Figure 5 is a cross-sectional view of the housing in which the rolling mill bearings are installed, and Figures 6 and 7 are characteristic diagrams of roll deflection stars as the position of the roll moves. , Figure 8 is a front view of a conventional two-high rolling mill.
Fig. 9 is a side view of the same, Fig. 10 is a cross-sectional view of the main part of the housing in which the bearing of the rolling mill is installed, Fig. 11 is a schematic diagram showing roll deflection, and Fig. 12 is a schematic diagram of the increasing and decreasing state of the crown. It is a diagram. 20... Housing, 22. 24... Work roll, 26... Rolling machine, 28... Bank up roll unit I, 32... Hack up shaft, 3
4R. 34L... Zabo 1-roll, 40... Rotating hair ring, 42.44... Thrust bearing, 46,4
8゜50...bearing, 54...pressure cylinder, 56R
, 56I,... Roll guide, 58... Guy L, Shaft I, 60... Slide casing, 90...
Wrap transmission means, 91...rotating drum (drive wheel),
92...Motor, 1]3...Screw rond, 9
5R, 951-... Pulley, 96R, 96L... Lobe, 100... Roll bending device. Figure 3(b) Figure 4

Claims (1)

[Scope of Claims] It is equipped with a pair of work rolls that roll down the rolled material, and a backup roll that rolls into contact with the work rolls, and the bearings at both ends of each roll are attached to a housing, and the bearing spacing between the pair of work rolls is adjusted. In a rolling mill in which a pressure means for crown control is incorporated into the housing, both the upper work roll and the lower work roll have the same diameter, and the profile of the upper work roll is such that the roll diameter is large at the center and the roll diameter at both ends is the same. The backup roll has a crown shape with a smaller roll diameter, and the backup roll is formed by a pair of support rolls with a short body length separated in the roll axis direction, and the separated support roll is rotatably supported and slidable in the axial direction. It is configured by being attached to a backup shaft that supports the
A guide member that is movably mounted on a guide shaft disposed parallel to the backup shaft and engages with the separation roll body is attached, and a screw rod having opposite threads carved in each of the pair of guide members is attached. The driven wheel is attached to either the pair of guide members or the screw rod, the driving wheel is attached to the fixed side of the housing, etc., and the driven wheel and the driving wheel are connected to each other through a winding means such as a belt. A rolling mill characterized in that rotation can be transmitted between the coaxially disposed separation rolls and an interval between the separation rolls can be adjusted.