JP2530463Y2 - Rolling mill - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a rolling mill that performs rolling of a plate (strip) while performing shape control (control of thickness distribution in a plate width direction).

[Prior Art] In the rolling of a plate, the thickness may be uneven in the width direction of the plate due to the deflection of the rolling roll. However, the thickness may be made uniform or controlled to an aimed shape (thickness distribution). Or in the axial direction (that is, in the sheet width direction) with respect to the roll axis.
The sleeve may be fitted at a variable position. Such a rolling mill is disclosed, for example, in the following publications.

1) Japanese Utility Model Publication No. 59-40083: This publication describes a hydraulic cylinder and a sleeve provided on a rolling mill housing (frame) after a cylindrical sleeve is fitted to a roll shaft for a backup roll supporting a work roll. Are connected via a bearing member, and the cylinder is used to move the sleeve in the axial direction. The sleeve is fixed to the roll shaft by fitting it with an interference margin, and its position is fixed. By supplying a pressurized fluid between the fitting surfaces (so-called oil injection is performed), the sleeve is easily moved by the cylinder. ing. Since the deflection curve of the work roll changes by changing the position of the sleeve on the backup roll, the shape of the rolled plate can be controlled.

2) Japanese Unexamined Patent Publication No. 55-57308: The rolling mill described therein is characterized in that a cylindrical sleeve is fitted on a roll shaft and that a pressurized fluid supply means is provided with a clearance between the two. Is the same as 1) above, except that a hydraulic cylinder or the like is provided near the end of the roll body as a device for moving the sleeve in combination with the above means, thereby changing the position of the sleeve during non-rolling operation. It is.

3) JP-A-63-60007: The sleeve moving on the roll axis for controlling the shape of the plate has a special crown instead of a simple cylindrical shape, and its outer diameter changes continuously in the axial direction. Rolling mill is disclosed. This rolling mill is also provided with a pressure fluid supply means similar to the above as necessary, but as a means for moving the sleeve, a drive screw is provided by engaging with the end of a roll shaft and a chock (bearing box). The screw is screwed to the end of the sleeve that extends beyond the chock position to near the end of the roll shaft. When the screw is turned by a motor or the like, the sleeve screwed to the screw moves in the axial direction. Since the shape of the roll cap (distribution of the gap dimension in the axial direction) is positively determined and changed depending on the contour of the crown, the controllability of the plate shape is high.

[Problems to be Solved by the Invention] The rolling mills described in the above publications 1) to 3) have problems in the following points.

1) Rolling mill disclosed in Japanese Utility Model Publication No. Sho 59-40083: Since the sleeve moving device (hydraulic cylinder) is fixed to the housing, when the roll is replaced, the device is separated from the housing, and the roll is connected again after the replacement. And complicated work. In addition, providing a frame for mounting the apparatus in the vicinity of a work roll or the like is not practical because it increases the size and complexity of the rolling mill.

2) Rolling mill disclosed in Japanese Patent Application Laid-Open No. 55-57308: Since the moving device of the sleeve is provided near the end of the roll body instead of the housing, the device of the moving sleeve can be used for rolls other than the backup roll. The control ability of the shape of the sheet together with the rolling mill of 1) is not always sufficient. The deflection curve (i.e., the roll gap shape) of the roll can be freely determined only by the position of the end of the sleeve on the roll axis with respect to the end of the plate to be rolled. This is not necessarily the case.

3) Rolling mill disclosed in JP-A-63-60007: Since the roll gap shape can be positively determined, the plate shape control ability is much better than the rolling mills described in 1) and 2) above. There is room for improvement in the moving mechanism and the like.
That is, in the rolling mill of 3), it is necessary to a) elongate the sleeve from the position of the chocks to the vicinity of the end of the roll shaft. B) At the position of the chocks, the sleeve is fitted with the sleeve. The life of the bearing tends to be shortened based on the gap between the mating surfaces because the roll shaft is supported by the bearing. C) The mounting of a drive screw or motor, and the formation of a thread at the end of the sleeve In this respect, there is a disadvantage that the sleeve moving mechanism is not easily configured.

An object of the present invention is to provide a rolling mill that has a high plate shape control ability, a simple sleeve moving mechanism, a movable sleeve can be applied without selecting a roll, and the roll can be easily replaced. It is to be.

[Means for Solving the Problems] The rolling mill of the present invention uses a sleeve formed with a continuous change in the outer diameter in the axial direction with respect to an arbitrary pair of rolls of a pair of rolls, on a roll shaft. A pressurized fluid supply means is provided between the fitting surfaces, and the expandable actuator for axially moving the sleeve is rotatably supported on both sides of the sleeve by the roll shaft in the fixed housing. Attached to the two chocks, a push plate that comes into contact with each end face of the sleeve is attached to the telescopic end of the actuator, and the actuator including the push plate is extended infinitely in the direction supported by the housing (in the direction parallel to the axis). Face)
Attached inside each other. The change in the outer diameter of the sleeve (that is, the shape of the outer peripheral surface) may be in accordance with, for example, the roll shape disclosed in JP-A-63-20106.

[Operation] The plate shape control in the rolling mill of the present invention is basically performed as follows. That is, when the sleeve fitted to the roll shaft as described above is applied with fluid pressure (for example, subjected to oil injection) between the fitting surfaces by the pressurized fluid supply means, it becomes easy to move, and in this state, It is moved in the axial direction by an actuator.
However, the present rolling mill is characterized by the following three points.

The first point is that, as described above, the sleeve is formed with a continuous change in the outer diameter in the axial direction,
That is, appropriate crowning is applied to the outer peripheral surface of the sleeve. Operationally, therefore, the profile of such sleeves on a pair of rolls defines the roll gap where the plate fits, and changes the thickness distribution of the gap by moving the sleeves of the pair relatively axially. And shape control can be performed over a wide range with high accuracy.

The second point is that the above-mentioned sleeve is moved by each actuator attached to the two chocks on both sides of the sleeve as described above. When one of the actuators is extended in a state where the pressure fluid supply means is operated as described above, the sleeve is pushed by the actuator and moves. As an actuator, for example, a hydraulic cylinder may be provided in a direction parallel to the roll axis, and the chocks are provided on any of the rolls. You can configure it. A push plate is attached to the expansion and contraction end of the actuator, and the plate is brought into contact with each end surface of the sleeve.Thus, the thrust of the actuator is widely dispersed by the contact area to affect the end surface of the sleeve, and the deformation of the sleeve is prevented. Can be prevented.

The third point is that, as described above, each actuator including the push plate is mounted inside the supported surface of the chock by the fixed housing. The chock is built into the rolling mill with the front and rear surfaces (front and rear in the plate feeding direction) in the frame of the housing, that is, the actuator and the push plate do not protrude before and after the chock. For this reason, together with the fact that the actuator is fixed to the chock instead of the housing as described above, it is possible to pull out the roll shaft and the sleeve together with the chock from the housing in the axial direction with the actuator attached to the chock, Roll exchange can be performed quickly and easily.

Embodiment FIG. 1 and FIG. 2 are drawings relating to a first embodiment of the present invention. 2 (a) and 2 (b) are operation explanatory views schematically and generally showing a rolling mill 1 for a steel plate (strip) a, and FIG. 1 (a) is incorporated in the rolling mill 1. (B) and (c) of FIG.
It is an arrow view and cc sectional drawing.

As shown in FIG. 2 (a), the rolling mill 1
Rolling is performed by sandwiching the steel plate a between the rolling roll 10 incorporated into the housing (reference numeral 70 in FIG. 1 (b)) through the roll and the rolling roll 20 incorporated through the chocks 24 and 25. . In order to perform shape control on the thickness distribution in the sheet width direction, each roll axis of rolls 10 and 20
11 ・ 21 has a sleeve 12 ・ 22 so that it can move in the axial direction.
Are fitted to each other. In the following, the sleeve 12 of the roll 10 and the structure for mounting and moving the roll 10 will be described first with reference to FIG. The description is omitted because there is no difference.

As shown in FIGS. 1 (a) to 1 (c), the roll 10 has the following configuration.

A sleeve 12 having a continuous change in outer diameter in the axial direction,
The roll shaft 11 was fitted to the roll shaft 11 by interference fit (fitting with interference such as press fitting or shrink fit). The continuous change in the outer diameter referred to above means that the outer peripheral surface of the sleeve 12 is made into a smooth curved surface, and the outer diameter dimension takes a local minimum value at one place and a local maximum value at one place as shown in the figure (the figure shows the maximum value). Exaggerating the changes)
(The resulting crown is commonly referred to as CVC), the effect of which is described below. The sleeve 12 is fitted on the roll shaft 11 between the chocks 14 and 15 and is usually fixed by an interference fit. In addition, the length is chock 14.
Slightly shorter (ie, at least as far as you can go) than 15 intervals.

A pressure fluid supply means 13 is provided so that oil injection (applying hydraulic pressure) can be performed between the fitting surfaces of the roll shaft 11 and the sleeve 12. As the same means 13, an annular pressurizing space 13a is formed on the outer peripheral surface of the roll shaft 11 at a place where the sleeve 12 is fitted, and as an oil supply passage having an opening in the space 13a and communicating with the end of the roll shaft 11. Branch hole 13
b. A main hole 13c is formed in the roll shaft 11, a rotary joint 13d is interposed at an end of the main hole 13c, and a hydraulic pipe (not shown) is connected. When the means 13 is actuated and oil injection is performed, the sleeve 12 slightly expands to loosen the fitting with the roll shaft 11 and facilitate movement in the axial direction.

Hydraulic cylinders 16 and 17 (four each) shown in FIGS. 1 (a) and 1 (b) are respectively attached to two chocks 14 and 15 as actuators for moving the easily movable sleeve 12 by a desired amount. Attached. That is, each cylinder 16
・ 17, fix the body to chocks 14 ・ 15,
Extendable rods 16a and 17a parallel to the roll shaft 11 in the holes provided in 15
, And the telescopic ends are arranged toward the sleeve 12, respectively. Then, push plates 18 and 19 as shown in the figure are attached to the respective telescopic ends of the cylinders 16 and 17. Chockes 14 and 15 are provided with bearings (14a
The roll shaft 11 is rotatably supported via a roller shaft 11 and the like. When the roll is replaced, the roll shaft 11 is carried out / in from the housing 70 integrally with the roll shaft 11 and the sleeve 12. To facilitate such a roll change, each actuator, that is, the cylinders 16 and 17 and the push plates 18 and 19 are shown in FIG.
As shown in (c), the chocks 14 and 15 are housed inside the left and right side surfaces (the surfaces supported by the housing 70) as viewed in the axial direction. Therefore, in the rolling mill 1, the roll can be changed without removing the cylinders 16 and 17 from the chocks 14 and 15. Needless to say, the same applies to a case where a screw-type expansion / contraction mechanism (not shown) is provided as an actuator in place of the cylinders 16 and 17, for example.

FIG. 1 (a) shows the rolling roll 10 when the sleeve 12 is fitted and fixed on the roll shaft 11 with the pressurized fluid supply means 30 in a rest state. Although the push plates 18 and 19 are separated from the end face of the sleeve 12, the movement of the sleeve 12 from this state is performed according to the following procedure.

Extend cylinders 16 and 17 slightly and push plate
18 and 19 are brought into contact with the end face of the sleeve 12, respectively.

Oil injection is performed by applying hydraulic pressure from a pipe connected to the joint 13d to the pressurizing space 13a.

The position of the sleeve 12 is adjusted by extending the cylinder 16 when moving the sleeve 12 to the right in the drawing and extending the cylinder 17 when moving the sleeve 12 to the left.

When the sleeve 12 moves to the appropriate position,
Reduce oil pressure to 13a to stop oil injection,
The position of the sleeve 12 is fixed. After that, cylinders 16 and 17
Is slightly contracted to release the contact with the sleeve 12.

In the rolling mill 1 shown in FIG. 2 provided with the rolling rolls 10 and 20 having the above-described configuration and function, FIG.
The shape control of the steel plate a can be performed in the manner exemplified in FIG. That is, the respective sleeves 12 and 22 on the roll shafts 11 and 21 are moved in the axial direction to change the shape of the roll gap between their outer peripheral surfaces sandwiching the steel plate a. (A) of the figure is a reference state in which the gap dimension is uniform in the axial direction (board width direction), and (b) of the figure is a state in which the gap dimension is small (thin) near the center. During actual operation with rolling force applied between rolls 10 and 20, roll 10
Since the action of the flexure of 20 is added, the thickness of the steel plate a is often uniform when the sleeves 12 and 22 are close to the positional relationship of (b).

By the way, if the actuator for moving the sleeve is attached to the chock of the roll, in a rolling mill having a plurality of pairs of rolls (that is, four, six, or more rolls), the sleeve and its movement can be moved with respect to any roll. Means can be provided. Such examples are shown in FIGS. 3, 4 and 5, and
A fourth embodiment will be described below.

First, FIG. 3 shows a four-stage rolling mill 100 including work rolls 110 and 120 and backup rolls 130 and 140. The work rolls 110 and 120, which are in direct contact with the plate a, are not provided with a sleeve. The roll axis
Fitted on 131 and 142 respectively. Although not shown, pressure rollers are provided for the rolls 130 and 140, and actuators for moving the sleeves 132 and 142 are attached to the chock. ) Are the same as in the first embodiment described above.

Even if the work rolls 110 and 120 do not have a crown, they are the sleeves 132 and 142 on the backup rolls 130 and 140
Same figure (the curve is also exaggerated)
Thus, by moving the sleeve in the axial direction, effective shape control can be performed on the plate a as in the first embodiment.

The rolling mill 200 shown in FIG. 4 has work rolls 210 and 220 and backup rolls 250 and 260, as well as intermediate rolls 230 and 2
This is a six-stage rolling mill having 40, in which sleeves 232 and 242 with a crown are fitted to roll shafts 231 and 241 of intermediate rolls 230 and 240. The intermediate rolls 230 and 240 have the same configuration as the rolls 10 and 20 of the first embodiment and the rolls 130 and 140 of the second embodiment. If the deflection of each roll at the time of rolling is exaggerated as shown in the figure, the shape of the plate a can be controlled also in the rolling mill 200.

The same sleeve as described above can be provided on two or more pairs of rolls, but FIG. 5 shows an example. Rolling machine 30 in the figure
In the work rolls 310 and 320, the intermediate rolls 330 and 340, and the backup rolls 350 and 360, the crowned sleeves are fitted on the roll shafts respectively, and the plate a Again, highly accurate shape control can be performed.

As described above, four embodiments have been introduced according to the drawings.However, the present invention can be carried out with respect to any number of rolling mills other than those shown in the drawings, and it is possible to equip a movable sleeve without selecting a roll,
It is clear from the above description. In addition, the so-called roll bending method of controlling the shape of a rolled sheet by giving an elastic bending deformation to a roll with a force applied to a chock, the so-called roll bending method is used in the rolling mill according to the present invention (in addition to any rolls). ) Can be applied. Further, it goes without saying that the rolling target of this rolling mill covers a wide range of plates, including the steel plates described in the embodiments.

[Effects of the Invention] The rolling mill of the present invention has the following effects.

1) The ability to control the plate shape is high.

2) Since the moving mechanism of the sleeve is simple, it can be configured at low cost.

3) Since the movable sleeve can be equipped without selecting a roll, it is possible to provide optimal plate shape control characteristics according to the type of plate to be rolled and the structure unique to the rolling mill.

4) Since the roll exchange is easy, the maintenance work time can be shortened by that much and the productivity can be improved.

5) The push plate attached to the expansion and contraction end of the actuator can distribute the force on the sleeve and prevent the sleeve from being deformed.

[Brief description of the drawings]

1 and 2 are views showing a first embodiment of the present invention. FIG. 1 (a) is a side view of a rolling roll (the left chock is shown by a section in FIG. 1 (b)), and FIGS. 1 (b) and 1 (c) show the same in FIG. 1 (a), respectively. The bb arrow view and the cc sectional view. 2 (a) and 2 (b) are operation explanatory views schematically showing the entire rolling mill having the rolls. FIGS. 3, 4, and 5 are schematic views of rolling mills as second, third, and fourth embodiments of the present invention, respectively. 10 ・ 20 …… Roll roll, 11 ・ 21 …… Roll axis, 12 ・ 22…
... Sleeve, 13 ... Pressure fluid supply means, 14/15 ... Chock, 16/17 ... Hydraulic cylinder (actuator), 18
・ 19 …… Push plate, a …… Steel plate.

Claims (1)

(57) [Scope of request for utility model registration] A sleeve formed with a continuous change in outer diameter in the axial direction is fitted to a roll shaft, and a pressure fluid supply means is provided between the fitting surfaces to move the sleeve in the axial direction. The telescopic actuator is fixed to two chocks that rotatably support the roll shaft inside the fixed housing on both outer sides of the sleeve,
A rolling mill, comprising: a push plate that is in contact with each end face of a sleeve; and an actuator including the push plate, which is attached to a telescopic end of the actuator, and the actuator including the push plate is mounted inside a surface supported by the housing.