JP2001232402A - Mill and method for rolling metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform rolling suitable to hard materials and extra thin materials by supporting small-diameter work rolls with high reliability even under transient conditions such as the starting time of rolling work and completing time of the rolling work. SOLUTION: Non-driven both-end supporting rolls 9, 10, 11, 12 are installed at both ends on the outside of the region where sheets having the maximum width Wmax of the work roll 3 are passed through so as to be faced to each other on the inlet and outlet sides of each end part and the work rolls are pressed and supported by them. Hydrostatic bearings 21, 23 are installed in the middle part on both sides of the barrel of the work rolls 3, the work rolls 3 are floated by forming clearances between the hydrostatic bearings 21, 23 and the work rolls 3 by supplying fluid such as oil to the bearing parts from fluid pressure supply ports 25, 26 and supported in the horizontal direction in non-contact state. The proper floating height and supporting force are set or controlled by changing the supplying pressure of the fluid which is supplied to the hydrostatic bearings 21, 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet rolling machine, and more particularly to a sheet rolling machine and a sheet rolling method suitable for high-quality rolling of hard materials and ultra-thin materials using small-diameter work rolls.

[0002]

2. Description of the Related Art Conventionally, small diameter work rolls have been used for rolling hard materials such as stainless steel and ultra-thin materials. When the diameter of the work roll is reduced, the bending rigidity of the roll is naturally reduced, and the deflection in a horizontal plane is a problem. This horizontal deflection causes deterioration of the shape (flatness) of the plate material.

In view of the above, a cluster type multi-high rolling mill such as a sendzimir mill and a Japanese Patent Application Laid-Open No. 60-18 / 1985.
No. 206, a rolling mill having a horizontal deflection preventing mechanism for supporting a body portion of a work roll from a horizontal direction by a support roll has been developed. But,
In these rolling mills, since the support is carried out by using the divided support rolls in the length direction of the work roll, there is a problem that the transfer mark by the divided support rolls deteriorates the surface property of the sheet material.

In order to cope with this, a sliding bearing pad is provided which comes into direct sliding contact with the horizontal entry and exit sides of the work roll without using a split roll, and is pressed to control the horizontal displacement to control the displacement of the plate material. A method for controlling the shape is disclosed in
No. 262005.

According to this method, since the bearing pad and the work roll are supported by sliding, if the lubrication state is poor, the work roll surface is directly scratched by the sliding,
A burn-in phenomenon occurs, and these scratches are transferred to the surface of the plate material to deteriorate the plate quality.

[0006] As a method of solving such a problem, a horizontal support mechanism for supporting the work roll by a hydrostatic bearing via an idle roll instead of directly supporting the work roll by a slide bearing pad. A rolling mill with
JP-A-2-147108 and JP-A-10-2303
No. 08 discloses this.

[0007] At the start of the rolling operation (when the plate material is engaged)
Under such discontinuous conditions, there is a problem that a force that causes the work roll to bend greatly is applied to the hydrostatic bearing, and the gap between the hydrostatic bearing and the idle roll becomes small and eventually comes into contact. There is. JP-A-11-34
In order to prevent this, Japanese Patent Application Laid-Open No. 7607 discloses a technique of "providing a stopper means for preventing a gap between a hydrostatic bearing and a work roll or an idle roll supported by the hydrostatic bearing from becoming less than a predetermined value". Have been.

In this publication, the stopper means is constituted by a gap defining roll which comes into contact with the work roll from a substantially horizontal direction at a position axially outside a region corresponding to the maximum plate width of the plate material, and comprises a hydrostatic bearing. And the gap between the idle roll and the idle roll is prevented from becoming smaller than a predetermined value.

On the other hand, Japanese Patent Application Laid-Open No. 9-285804 discloses that a work roll having only the same contact position as that of the above-mentioned gap defining roll is supported only on the outside of the work path (outside of the maximum sheet width of the work sheet) at both ends. There is disclosed a technique for horizontally supporting by pressing.

[0010]

However, in the technique disclosed in Japanese Patent Application Laid-Open No. 11-347607, the rolls defining the gaps at both ends basically serve only as a stopper for preventing horizontal movement of the work roll. In the state where the work is not performed, the gap defining roll is in a state in which a small interval exists or is in light contact between the two ends of the work roll without applying a pressing force to both ends thereof.

For this reason, under a transient condition such as at the start of the rolling operation (when the plate material is engaged), when a load is suddenly applied from a state where the gap defining roll is not rotating, the working roll and the gap defining roll slip. There have been various problems such as the occurrence of scratches and transfer to each roll, and the sudden shock load occurring at the moment when the gap defining roll comes into contact with the work roll, causing the bearing portion to be damaged.

Further, since the gap defining roll does not share and support the horizontal load generated on the work roll during rolling, the hydrostatic bearing bears all the rolling load, and only when the rolling work is started (when the plate material is engaged). However, even at the end of the rolling operation (when the plate material passes through), there is a problem that the idle roll is likely to come into contact with the hydrostatic bearing due to a sudden shock load.

On the other hand, in the technology disclosed in Japanese Patent Application Laid-Open No. 9-285804, since no static pressure bearing is provided, all horizontal load forces generated on the work rolls are applied to both ends provided in a relatively narrow area outside the plate path of the work rolls. Since the support rolls are supported only by the support rolls, there are problems such as the life of the bearings of the support rolls at both ends.

It is an object of the present invention to provide a method for preventing scratches from being generated due to slippage between rollers even under transitional conditions such as at the start of a rolling operation and at the end of a rolling operation. An object of the present invention is to provide a sheet rolling machine and a sheet rolling method suitable for obtaining a high-quality hard material or ultra-thin material by reliably supporting a small-diameter work roll without damaging a bearing portion of the roll.

[0015]

According to the present invention, there is provided at least a pair of upper and lower work rolls for rolling a sheet material, and a work driving roll supported by the work rolls in a vertical direction. In a plate rolling mill provided with at least a pair of reinforcing rolls, the outer ends of the width of the plate on which the maximum width of the plate passes on the body of the work rolls, and at least one pair of the both ends are horizontally opposed to each other. Support rolls at both ends to press and hold, at least the entrance side of the center of the body of the work roll,
And a hydrostatic bearing for supporting one of the outlet sides in a substantially horizontal direction by fluid pressure.

[0016] Thus, the horizontal deflection of the work roll, which occurs during rolling transitional conditions such as at the start of the rolling operation and at the end of the rolling operation, is effectively shared by both means of the rolls at both ends and the hydrostatic bearing, thereby ensuring reliable support. You can do it.

(2) To achieve the above object,
According to the present invention, in a plate rolling mill provided with at least a pair of upper and lower work rolls for rolling a plate and at least a pair of reinforcing rolls for supporting the work rolls in the vertical direction and applying a rolling driving force, Both ends of the outer side of the width of the maximum plate width of the plate material on the part, both ends support rolls pressing and sandwiching at least one pair in the horizontal direction facing each other,
A static pressure bearing is provided which supports at least one of the entrance side and the exit side at the center of the body portion of the work roll in a substantially horizontal direction by fluid pressure through at least one or more idle rolls.

Thus, the horizontal deflection of the work roll can be effectively shared by both means of the both-end support roll and the hydrostatic bearing so that reliable support can be performed. Further, even if the diameter of the work roll is changed by grinding, the work roll can be secured. Appropriate support by the hydrostatic bearing is always possible through contact with the idle roll.

(3) In the plate rolling mill according to the above (1) or (2), preferably, the whole support device integrally configured with the support portion of the both-ends support roll and the support portion of the hydrostatic bearing is provided. The work roll can be adjusted horizontally as the reference side on either the entry side or the exit side, and the work roll can be pressed horizontally against the reference side as the pressing side on the opposite side of the work roll. It shall be installed in

Thus, the relative positional relationship with the hydrostatic bearing can be easily set accurately by simply setting the positional relationship between the rolls at both ends with respect to each of the overall supporting devices, and appropriate support is possible. Becomes

(4) In the plate rolling mill according to the above (1) or (2), preferably, the support by the hydrostatic bearing is supported on the side receiving the load against the load by rolling, and the opposite side is contactless or It shall be supported by light contact.

[0022] Thus, it is possible to suitably support the work roll without applying an extra load to the hydrostatic bearing on the side receiving the load due to the rolling.

(5) In the sheet rolling mill according to any one of the above (1) to (4), preferably, at least one of the both-end support rolls on the entrance side or the exit side and at least one support portion of the hydrostatic bearing. It is assumed that a load force detecting means is provided.

Thus, the horizontal position can be set and controlled so that the hydrostatic bearing can be supported with an appropriate supporting force.

(6) In the sheet rolling mill according to any one of the above (1) to (5), preferably, the horizontal support force of the reference-side both-end support roll support portion is between the work roll and the both-end support roll. It is controlled so as to be larger than the slip generation limit value and smaller than the support limit value of the both-end support roll, while the pressing force of the both-end support roll on the pressing side is larger than the slip generation limit value between the work roll and the both-end support roll, The control is to be made as large as possible within the support limit value of the support roll or less.

As a result, it is possible to prevent the occurrence and transfer of scratches due to slippage between the rolls, and to prevent the bearing of each roll from being damaged by a high load, thereby supporting the work roll with high reliability.

(7) In the sheet rolling mill according to any one of the above (1) to (6), preferably, there is provided a means for variably controlling the effective length of the hydrostatic bearing to be substantially equal to the sheet width. Shall be provided.

[0028] Thereby, the pressing and supporting force on the work roll is minimized, so that the deflection of the work roll is suppressed to the minimum, and the reaction force direction of the support portions at both ends is constant without reversing. It improves the stability of the support.

(8) Using the plate rolling machine of (1) or (2) above, the work roll is supported horizontally by both means of a roll at both ends and a hydrostatic bearing to perform rolling.

According to this method, the horizontal deflection of the work roll generated during the rolling transitional conditions such as at the start of the rolling operation and at the end of the rolling operation is effectively shared by both means of the rolls at both ends and the hydrostatic bearing so that the support is ensured. Can be performed.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part of the plate rolling mill 1 according to the first embodiment of the present invention, and FIG. 2 is a horizontal sectional view of a main part of the plate rolling mill 1. In these figures, work rolls 3 and 4 installed as a pair of upper and lower so as to roll the plate material 2 are vertically supported by intermediate rolls 5 and 6 and reinforcing rolls 7 and 8, and the intermediate rolls 5 and 6 Is connected to a motor (not shown), and the work rolls 3 and 4 are driven by the intermediate rolls 5 and 6.

At both ends outside the region where the plate of the maximum work width Wmax of the upper work roll 3 passes, non-driven both-end support rolls 9, 10, 11, and 12 face each other at the entrance and exit sides of each end. It is installed as follows.

Here, in this embodiment, the rolling pass direction of the plate 2 is from left to right, and
The left side is set as the rolling path position setting side of the work roll 3 (hereinafter referred to as the reference side), and the opposing right side is set as the pressing side.

The support rolls 10, 12 on both sides of the reference side are provided.
Are mounted on both end supporting roll position setting devices 13 and 14 located in the horizontal direction of the work roll, and the both end supporting roll position setting devices 13 and 14 are fixed to housing posts 16 and 18.

In this embodiment, the both-end support roll position setting devices 13 and 14 are of a screw type driven by a motor, but may be of another type such as a fixed type or a hydraulic cylinder having a position adjusting function.

Both ends support force detecting device 19, which is one of the load force detecting means for detecting the load force from work roll 3,
Reference numeral 20 is installed on both end support roll position setting devices 13 and 14 so that the sum of the load force generated at both ends of the work roll 3 and the pressing force from the opposite end support rolls 9 and 11 can be detected. It is.

Hydrostatic bearings 23, 24 are installed at the center of the reference side body of the work rolls 3, 4, and a fluid such as oil is supplied from the fluid pressure supply port 25 to the bearings, and the hydrostatic bearings 23, 24 are provided.
The work roll 3 is floated by forming a gap between the work roll 3 and the work roll 3 in a non-contact manner. Hydrostatic bearing 2
By changing the supply pressure of the fluid to be supplied to 3 and 24, it is possible to set or control an appropriate floating amount and supporting force.

The hydrostatic bearings 23 and 24 are respectively mounted on beams 29 and 30 having high rigidity.
9 and 30 are further installed on hydrostatic bearing position setting devices 33 and 34 fixed to the housings 16 and 18.

The hydrostatic bearing position setting devices 33 and 34 set and control the gap between the hydrostatic bearing 23 and the work roll 3 so as to appropriately support the work roll horizontal force generated during the rolling operation. Further, the static pressure bearing position setting devices 33 and 34 are provided with static pressure support force detection devices 35 and 36 so that the support force of the static pressure bearing 23 can be detected.

On the other hand, on the pressing side (the right side in FIG. 2) opposite to the position (reference side) of the work roll 3 in the rolling pass direction, both-end supporting roll pressing devices 37 and 38 fixed to the housings 15 and 17. The supporting rolls 9 and 11 on the pressing side, which can be pressed by this, are installed at positions opposite to the positions of the supporting rolls 10 and 12 on the reference side.

The both-end supporting roll pressing devices 37 and 38 include a both-end pressing force detecting device 39 which is one of load force detecting means so as to detect the pressing force of the pressing-side both-end supporting roll.
40 are installed.

In FIG. 2, both end supporting roll pressing device 3
Numerals 7 and 38 show examples of cylinders, but they may be of a fixed type or a screw type. In that case, it is necessary to use a load cell or the like as the pressing force detecting devices 39 and 40 at both ends.

Hydrostatic bearings 21 and 22 are provided at the center of the press-side body of the work rolls 3 and 4, and a fluid such as oil is supplied from the fluid pressure supply port 26 to the bearings, and the hydrostatic bearings 21 and 22 are provided.
The work roll 3 is floated by forming a gap between the work roll 3 and the work roll 3 and is pressed and supported in a horizontal direction without contact.

The hydrostatic bearings 21 and 22 are mounted on beams 27 and 28 having high rigidity.
Are mounted on hydrostatic bearing position setting devices 31 and 32 fixed to the housings 15 and 17. The static pressure bearing position setting devices 31 and 32 are provided with static pressure pressing force detecting devices 41 and 42 so that the pressing support force of the static pressure bearings 21 and 22 can be detected.

In FIG. 2, the hydrostatic bearing position setting devices 31, 32 are shown.
Shows an example of a screw type, but a cylinder type may be used. In addition, the static pressure detecting devices 41, 4
Reference numeral 2 may be a means for directly detecting pressure other than the load cell.

Next, the rolls 9, 10, 11, 12 supported on both ends are provided.
The effectiveness of supporting the work roll 3 with both the bearings and the hydrostatic bearings 21 and 23 will be described below. The horizontal force S applied to the work roll 3 is as shown in FIG. S = Ft + (Tb−Tf) / 2 where Ft is a driving tangential force due to torque T of the intermediate roll 5 that supports the work roll 3 in the up-down direction, Tb is an input-side tension applied to the plate material 1, and Tf is an output-side tension. is there. Normally, the front and rear tensions Tb and Tf are set to substantially the same value, so that the above equation is usually S = Ft.

FIG. 4 (a) shows a model in which the horizontal deflection generated on the work roll 3 due to rolling in this case is supported by modeling the first embodiment as an example. FIG. 4B illustrates the amount of deflection δ occurring in No. 3. The distance between both ends is L, the length Lb of the hydrostatic bearing is 0.83L, and the width W is 0.83L (a
₀ , corresponding to a), 0.67L (corresponding to b), 0.5L
(Corresponding to c and c ′) Axial deflection δ for three cases
FIG. 5 shows the calculation result of the reaction force Rc (corresponding to the load side) of the fulcrum at both ends at that time, and FIG. 6 shows the calculation result as a ratio to the value (a ₀ ) in the case of simple support at both ends.

In FIGS. 5 and 6, the configuration of simple support at both ends corresponds to the case disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-285804, in which only the area outside the work roll plate is pressed and supported by the support rolls at both ends. It is clear that the deflection is large and the load on the supporting portion is large.

On the other hand, when the support is supported only by the hydrostatic bearings 21 and 23, the posture of the work roll 3 becomes unstable under rolling transition conditions such as at the start of the rolling operation and at the end of the rolling operation, and
It is already clear from the prior art that a stable support state cannot be ensured.

Both ends of the work roll 3 are supported by both end support rolls 9, 10, 11, and 12, and a central portion is a hydrostatic bearing 2
5 and 6, (a), (b), and (c) of FIGS. 5 and 6 show a state where the deflection δ is suppressed to a small value and the reaction force of both end supporting portions is a problem. It was evident that it was as small as possible.

Further, when the plate width W is narrow (c), the direction in which the reaction force is applied is reversed. This means that it is necessary to apply a pressing force equal to or greater than a certain value to the support portions at both ends, and to secure the work roll 3 by sandwiching it from both sides.

Further, according to FIG. 6, since it is clear that the load exerted on the both ends by the work roll 3 is relatively small, there is no problem in strength even if the pressing force is applied to the support portions at both ends.

Here, the reference-side both-end support rolls 10, 1
2 is at least the minimum force that does not cause a slip between the work roll 3 and the both-end support rolls 10 and 12 and the both-end support rolls 10 and 12 on the reference side.
Is set to be equal to or less than the strength allowable load. Further, the pressing force of the pressing-side both-end supporting rolls 9 and 11 against the both-end supporting portions may be set to be as large as possible below the allowable load of the pressing-side both-end supporting rolls 9 and 11.

The above setting and control are based on the supporting force and the pressing force detected using the reference side supporting roller supporting force detecting devices 19 and 20 and the pressing side supporting roller pressing force detecting devices 39 and 40, respectively. Done.

The actual setting and control is performed by adjusting the fluid pressure supplied to the roll position setting devices 13 and 14 and the hydrostatic bearing position setting devices 33 and 34 and the hydrostatic bearing 23 on the reference side. On the other hand, on the pressing side, the adjustment is performed by adjusting the fluid pressure supplied to the both-end supporting roll pressing devices 37 and 38, the static pressure bearing position setting devices 31 and 32, and the static pressure bearing 21.

Further, as shown in FIG. 7, two or more support rolls 9, 9 ′, 11, 11 ′ are installed on one side of each end of the work roll 3 to support the work roll 3. -Since the pressing can be more reliably performed, it is possible to further suppress the shaft deflection.

Further, as for the support of the hydrostatic bearings 21 and 23 at the center of the work roll 3, if it is attempted to support the opposite side of the load receiving side, the force is also added to the load receiving side, so that the shaft deflection is large. In addition, the burden is large. Therefore, only the side receiving the load is used as the hydrostatic bearings 21 and 23, and the hydrostatic bearing on the opposite side is not used or is supported with a small force so that the bearing on the side receiving the load is not burdened. There is a need. This is also possible because each end of the work roll 3 is pressed and sandwiched between the reference-side both-end support rolls 10 and 12 and the press-side both-end support rolls 9 and 11 that are opposed to each other, and is securely supported. Things.

It should be noted that the load receiving side can be changed to both the incoming side and the outgoing side in the rolling pass direction depending on the offset amount of the work roll 3 described later and other rolling conditions. It is necessary to determine the hydrostatic bearing to be used.

As can be seen from FIG. 5, when the plate width is narrow (c), the deflection curve of the work roll 3 becomes W-shaped. This is because the driving tangential force Ft that the work roll 3 receives from the intermediate roll 5 is effectively received only in the plate width region, and in the region outside the plate width, the support force from the hydrostatic bearing 23 on the opposite side is more greatly affected. This may adversely affect the rolling operation such as the shape of the plate material 2.

On the other hand, (c ′) is the length Lb of the hydrostatic bearing.
Is calculated as the same as the plate width W, but the deflection curve becomes smooth, and the reaction direction of the support portions at both ends is stabilized without reversing. Therefore, in the hydrostatic bearings 21 and 23, it is desirable to change the effective support length according to the plate width W of the plate material 2 and set it near the plate width.

As a specific configuration for realizing this, for example, as shown in FIG.
In another method, the fluid pressure circuit 44 for supplying the fluid pressure to the nozzle 3 is set as a separate path in the width direction, the pocket 43 is selected by means of a valve or the like according to the plate width W, and the supply of the fluid pressure is distributed.

The present invention can be similarly applied to a case where the work roll 3 and the intermediate roll 5 which supports the work roll 3 from above and below are offset in the rolling pass direction. That is, when there is no offset amount, the horizontal force S applied to the work roll 3 is S = Ft + (Tb−Tf) / 2, whereas when the offset amount y is set as shown in FIG. By considering the horizontal component Fp of the rolling load P as in S = Ft−Fp + (Tb−Tf) / 2, the rest can be handled in the same manner as without offset.

Next, FIG. 10 is a longitudinal sectional view of a main part of a sheet rolling mill 46 according to a second embodiment of the present invention, and FIG. 11 is a horizontal sectional view of a main part of the sheet rolling mill 46. In these figures, the difference from the first embodiment is that in the first embodiment, the hydrostatic bearings 21, 22, 23, and 24 directly support the central portions of the work rolls 3 and 4 in the horizontal direction. In this embodiment, the work rolls 3, 4 and the hydrostatic bearings 21, 22, 2,
Idle rolls 47, 48 between 3 and 24,
49, 50, and these idle rolls 47, 48,
The point is that the work rolls 3 and 4 are supported via 49 and 50. In the rolling operation, the work rolls 3 and 4 may be ground and reused.
Changes in diameter. On the other hand, the hydrostatic bearings 21, 22, 23, 2
In the case of No. 4, since the bearing inner diameter and dimensions do not change because of continuous use, the gap between the work rolls 3 and 4 and the bearing changes, making it difficult to secure an appropriate floating amount and supporting force, and there is a practical difficulty. This embodiment is more desirable.

FIG. 12 is a longitudinal sectional view of a main part of a sheet rolling mill 51 according to a third embodiment of the present invention, and FIG. 13 is a horizontal sectional view of a main part of the sheet rolling mill 51. In these figures, the difference between the second embodiment and the second embodiment is that the second embodiment is different from the first embodiment in that the two-end support roll position setting devices 13 and 14 on the reference side and the two-end support roll pressing devices 37 and 38 on the pressing side are respectively housings 15 and 16. , 17, and 18, whereas in the present embodiment, the reference-side both-end support roll position setting devices 13 and 14 are installed on the reference-side rigid beam 29, and the pressing-side both-end support roll position is pressed. The devices 37 and 38 are installed on the pressing-side rigid beam 27 and are integrally configured as overall support devices 52 and 54, respectively.

Both ends supporting rolls 9, 10, 11, 12 and hydrostatic bearings 27, 29 (or idle rolls 47, 49)
It is necessary to set an appropriate relative positional relationship from the viewpoint of the respective functions between them, and as in the above-described other embodiment, the both-end support rolls 9, 10, 11, 12 and the hydrostatic bearings 21, 23 are provided. If they are installed separately, the relative positional relationship is accurately set from a reference provided separately, which is a complicated operation.

On the other hand, with the configuration as in the present embodiment, the two-sided support rolls 9, 10, 11, and 12 can be easily formed by simply setting the positional relationship with respect to the entire support devices 52 and 54, There is an advantage that the relative positional relationship with the reference numeral 29 can be set.

However, in the load calculation, since the static pressure supporting force detecting devices 35 and 36 detect the total total supporting force (total supporting force) including both end supporting forces, the static pressure bearing 2
In the case of detecting only the static pressure supporting force applied to No. 3, it is necessary to calculate by subtracting both end supporting forces from the total supporting force.

[0068]

According to the present invention, the horizontal deflection of the work roll, which occurs in the transitional rolling condition such as at the start of the rolling operation or at the end of the rolling operation, is effectively shared by both means of the both-end support roll and the hydrostatic bearing. And reliable support can be performed.

Further, according to the present invention, even if the diameter of the work roll changes due to grinding, the appropriate support by the hydrostatic bearing can always be achieved through the contact with the idle roll.

According to the present invention, it is possible to easily and accurately set the relative positional relationship with the hydrostatic bearing simply by setting the positional relationship between the rolls at both ends with respect to each overall supporting device. Support is possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a sheet rolling mill according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of a main part of the plate rolling mill according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a horizontal force S applied to a small-diameter work roll.

FIG. 4A is a model diagram of support of horizontal deflection generated on a work roll by rolling, and FIG. 4B is a diagram illustrating a deflection amount δ generated on a work roll.

FIG. 5 is a diagram showing a change in shaft deflection δ when rolling conditions such as a plate width W and a work roll support method are changed.

FIG. 6 is a diagram showing a calculation result of a reaction force Rc of a fulcrum at both ends when the rolling conditions such as a plate width W and a work roll support method are changed, as a ratio to a value (a ₀ ) in a case of simple support at both ends. It is.

FIG. 7 is a diagram showing a configuration in which two or more two-end support rolls are installed on one side of each end of a work roll.

FIG. 8 is a diagram showing an example of a configuration in which the effective support length of the hydrostatic bearing is changed according to the plate width.

FIG. 9 is an explanatory diagram of a horizontal force S applied to the work roll when there is a positional offset (offset) in the rolling pass direction between the work roll and an intermediate roll supporting the work roll from above and below.

FIG. 10 is a longitudinal sectional view of a main part of a sheet rolling mill according to a second embodiment of the present invention.

FIG. 11 is a horizontal sectional view of a main part of a plate rolling mill according to a second embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of a main part of a plate rolling mill according to a third embodiment of the present invention.

FIG. 13 is a horizontal sectional view of a main part of a plate rolling mill according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate rolling machine of 1st Embodiment 2 Plate 3, 4 Work roll 5, 6 Intermediate roll 7, 8 Reinforcement roll 9, 9 ', 10, 11, 11', 12 Both-end support roll 13, 14 Both-end support roll position setting Devices 15, 16, 17, 18 Housing posts 19, 20 Supporting force detecting devices at both ends 21, 22, 23, 24 Static pressure bearings 25, 26 Fluid pressure supply ports 27, 28, 29, 30 Rigid beams 31, 32, 33, 34 Static pressure bearing position setting device 35, 36 Static pressure supporting force detecting device 37, 38 Both ends supporting roll pressing device 39, 40 Both ends pressing force detecting device 41, 42 Static pressure pressing force detecting device 43 Pocket 44 Fluid pressure circuit 45 Valve 46 Sheet rolling mills 47, 48, 49, 50 idle rolls 51 of the second embodiment Sheet rolling mills 52, 53, 54, 55 of the third embodiment Overall support device Horizontal force applied to work roll Ft Tangent force due to torque of intermediate roll T Torque of intermediate roll Tb Tension applied to plate Tf Outlet tension applied to plate P Rolling load of intermediate roll L Distance between both ends support Lb Static pressure bearing Length W Plate width δ-axis deflection Rc Reaction force at fulcrum at both ends y Offset amount Fp Horizontal force of rolling load

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukio Hirama 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside Power and Electricity Research Laboratory, Hitachi, Ltd. (72) Inventor Minoru Inogari 7-2-1, F-term in Electric Power & Electric Development Laboratory, Hitachi, Ltd. 3J103 AA02 CA52 DA08 FA09 FA26 FA30 GA02 GA15

Claims (8)

[Claims] 1. A sheet rolling machine provided with at least a pair of upper and lower work rolls for rolling a sheet material and at least a pair of reinforcing rolls for supporting the work rolls in a vertical direction and applying a rolling driving force, Both end supporting rolls that press and hold at least one pair of both ends outside the width through which the maximum plate width of the plate material passes on the body at least in pairs in a horizontal direction, and at least an entry side of the center of the body of the work roll. And a hydrostatic bearing for supporting one of the delivery sides in a substantially horizontal direction by fluid pressure. 2. A plate rolling machine provided with at least a pair of upper and lower work rolls for rolling a plate and at least a pair of reinforcing rolls for supporting the work rolls in a vertical direction and applying a rolling driving force, Both end supporting rolls that press and hold at least one pair of both ends outside the width through which the maximum plate width of the plate material passes on the body at least in pairs in a horizontal direction, and at least an entry side of the center of the body of the work roll. And a hydrostatic bearing for supporting one of the delivery sides in a substantially horizontal direction by fluid pressure via at least one or more idle rolls. 3. The plate rolling mill according to claim 1, wherein an overall support device integrally comprising a support portion of said both-ends support roll and a support portion of said hydrostatic bearing is provided on an entrance side of said work roll or On one side of the delivery side, the work roll is installed as a reference side so that the horizontal position of the work roll can be adjusted, and on the opposite side of the work roll, the work roll can be horizontally pressed against the reference side as a pressing side. A sheet rolling mill, which is installed on a plate. 4. The plate rolling mill according to claim 1, wherein the support by the hydrostatic bearing is supported on a load receiving side with respect to a load by rolling, and the opposite side is supported without contact or light contact. A sheet rolling mill characterized by the above-mentioned. 5. A sheet rolling mill according to claim 1, wherein a load force detecting means is provided on at least one of the support rolls of at least one of the inlet and outlet ends and at least one of the static pressure bearings. A sheet rolling mill comprising: 6. The plate rolling mill according to claim 1, wherein a horizontal supporting force of the support roll supporting portion on both sides of the reference roll is a slip between the work roll and the both support rolls. It is controlled to be larger than the limit value and smaller than the support limit value of the both-end support roll, while the pressing force of the both-end support roll on the pressing side is larger than the occurrence limit value of the slip between the work roll and the both-end support roll. A sheet rolling mill, wherein the control is performed so as to be as large as possible within a range equal to or less than a support limit value of the both-end supporting rolls. 7. The plate rolling mill according to claim 1, further comprising means for variably controlling the effective length of the hydrostatic bearing to be substantially equal to the plate width. A sheet rolling mill. 8. The work roll according to claim 1 or 2, wherein the work roll is horizontally supported by both means of the both-end support roll and the hydrostatic bearing to perform rolling. Plate rolling method.