JP3254904B2 - Horizontal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a pair of upper and lower work rolls and a pair of upper and lower support rolls for supporting the work rolls. The present invention relates to a horizontal rolling mill, a so-called work roll cross mill, which is installed so as to be rotatable about a portion as a rotation center and a support roll is installed without rotating.

[0002]

2. Description of the Related Art In order to accurately control a sheet crown of a sheet material manufactured by being rolled by a horizontal rolling mill, a work roll bending apparatus or a method of providing an initial crown on a work roll in advance and performing rolling has been conventionally used. I have been.

In recent years, there has been a demand for a technique capable of further expanding the crown control amount of the work roll obtained by these techniques. The upper work roll and the upper backup roll, and the lower work roll and the lower backup roll are each paired to form a vertical roll. A horizontal rolling mill has been proposed that performs rolling by arranging the work rolls so as to cross in a horizontal plane. This means that one or both of the upper work roll and the upper backup roll, the lower work roll and the lower backup roll of the horizontal rolling machine are inclined at an appropriate angle in the horizontal plane, and the central axes of the upper and lower work rolls facing each other are parallel. Rolling is performed so as to prevent the work rolls from being crowned, thereby increasing the crown control amount of the work roll.

[0004] However, since a large thrust force in the roll body length direction acts on the work roll of this horizontal rolling mill, it is necessary to reduce the thrust force. Therefore, various proposals regarding the improvement of such a horizontal rolling mill have been made.

For example, Japanese Utility Model Publication No. Sho 60-32881 discloses that a work roll cloth receives a thrust force acting on a work roll, so that at least one of a pair of upper and lower work rolls is applied to a roll cylinder in a horizontal plane. There has been proposed a horizontal rolling mill provided with a plane arc-shaped stepped portion for displacing upper and lower roll chocks in an arc shape with a center in a longitudinal direction as a rotation center.

In Japanese Utility Model Publication No. 3-44324, a shift function is added to a work roll of a horizontal rolling mill in which upper and lower work rolls are arranged to cross in a horizontal plane by sandwiching the work rolls with a shiftable cross beam. Horizontal rolling mills have been proposed.

Furthermore, Japanese Patent Publication No. 63-17001 proposes a horizontal rolling mill in which upper and lower work rolls are connected with respective work roll chocks in order to reduce the thrust force generated by a work roll cloth.

However, a horizontal rolling mill in which upper work rolls and upper backup rolls, lower work rolls and lower backup rolls are respectively paired and arranged so that upper and lower work rolls cross in a horizontal plane is a rolling mill. The complexity of the structure of each part (especially the backup roll chocks), the increase in equipment costs associated with this complexity, and the control of the thickness drop (edge drop) at both ends in the width direction of the material to be rolled. There is a problem that it is not easy, and there has been a need for a horizontal rolling mill capable of sufficiently securing the crown control capability and suppressing an increase in equipment costs as much as possible.

Particularly, in a horizontal rolling mill proposed in Japanese Patent Publication No. 63-17001, a rolling mill is used to connect work roll chocks to each other, for example, to avoid interference with an already installed work roll bending device. There has been a problem that the configuration of each part is considerably complicated.

Therefore, the present applicant has previously proposed a horizontal rolling mill in which only a work roll is inclined in a horizontal plane and a backup roll is not inclined (hereinafter, referred to as a "work roll cross mill" in the present specification). .

[0011]

However, in the work roll cross mill, the thrust force acting in the work roll body length direction when the work rolls are crossed is inclined in the same direction with the work roll and the backup roll as a pair. There is a problem that the size becomes larger than the above-mentioned horizontal rolling mill.

FIG. 3 is an explanatory view showing a simplified situation when rolling is performed by the work roll cross mill 40. As shown in FIG.
Considering the upper work roll 41 when rolling is performed without crossing the upper and lower backup rolls 43 and 44 while crossing only the roll 2, the thrust force acting in the roll body length direction is equal to the rolled material 45. a thrust force P ₁ to generate a contact portion as a starting point, a thrust force generates a contact portion between the upper backup roll 43 as a starting point P
There are a _2, these thrust forces P ₁ and P ₂ act in opposite directions. Also, the thrust forces P ₁ and P ₂
There is a marked difference in the magnitude of P ₂ >> P ₁ .

Of course, in the work roll cross mill 40 as shown in FIG.
In order to reduce the thrust force acting on the upper work roll 41 and the upper backup roll 43, and between the lower work roll 42 and the lower backup roll 44, lubrication is sufficiently performed. The thrust force acting on the work rolls 41 and 42 of the work roll cross mill 4
The thrust forces acting on the upper and lower work rolls 41 and 42 cannot be suppressed to an allowable level. for that reason,
At present, the work roll cross mill 40 has not been put to practical use.

The present invention has been made in view of the above-mentioned problems of the prior art. In a work roll cross mill, the thrust force acting on the work roll when the work roll is crossed is adjusted to an allowable level. It is an object of the present invention to provide a horizontal rolling mill that can be reduced.

[0015]

A horizontal rolling mill according to the present invention comprises a pair of upper and lower work rolls, and a pair of upper and lower support rolls for supporting these work rolls. The work roll is a horizontal rolling mill that is installed rotatably around the center of the work roll body length direction and the support roll is installed without rotation, and the work roll cylinder is used when the work roll chock rotates. At least one of the upper and lower work rolls, or at least one of the upper and lower support rolls, is provided on at least one of the upper and lower support rolls along a circular locus whose center of rotation is the center of rotation. The support member, at least one of the upper and lower support rolls, or the upper and lower work rolls. Without even one in which the support member provided on one of the work roll chocks is characterized in that it comprises a connecting member constituted by the fittable groove.

[0016]

According to the horizontal rolling mill of the present invention, by connecting at least one of a combination of four work roll chocks and four support roll chock, the work roll and the support roll chock are connected to each other. In order to provide a connecting member that indirectly connects the support roll in the roll body length direction, when rolling is performed by crossing the work roll,
By connecting at least one work roll chock and the support roll chock and connecting the work roll and the support roll in the roll body length direction, all the thrust force acting on the work roll can be received by the support roll chock via the work roll chock. As a result, the two thrust forces acting in opposite directions in the roll body length direction can be canceled out.

That is, in FIG. 3, the thrust force P acting on the work roll 41 after the upper work roll 41 is connected to the upper backup roll 43 as a supporting roll via respective roll chocks by a connecting member is P.
= P ₂ −P ₁ , and has the same direction as the thrust force P ₂ generated starting from the contact portion with the support roll, and the magnitude thereof is | P ₂ −P ₁ |.

The thrust acting this way, according to the horizontal rolling mill to the present invention, together with it is possible to a small value by P ₁ than conventional thrust force acting on the support roll chocks, the work roll chocks You will be able to dissolve your power.

In the horizontal rolling mill according to the present invention, specifically, the following two connecting member modes, namely, a work roll chock and a circle centered on the center of the work roll body length direction when the work roll rotates, are used as rotation centers. A mode in which an arc-shaped support member that can be put in and taken out along an arc-shaped locus is provided, and an arc-shaped groove portion in which the support member can be fitted is provided in the support roll chock. This embodiment shows an aspect in which an arc-shaped support member that can be freely inserted and removed along an arc-shaped trajectory whose center of rotation is the center of the longitudinal direction is provided, and an arc-shaped groove that allows the support member to be fitted to a work roll chock is provided.

In each of these two embodiments, the work roll and the support roll are moved in the roll body length direction of the work roll and the support roll via the work roll chock and the support roll chock when the work rolls of the work roll cross mill are crossed. To be connected, the horizontal rolling mill according to the present invention has,
Both the thrust force reducing action of the support roll chock and the thrust force eliminating action of the work roll chock are exhibited.

Further, regardless of the cross angle between the upper and lower work rolls, the connecting member and the groove are always in surface contact, so that the thrust force acting on the work roll can be reliably received.

Further, since the connecting member can be freely taken in and out of the installed work roll chock or the supporting roll chock, when it is necessary to pull out a work roll such as a roll change from the rolling mill body, the connecting member is retracted and connected. Can be performed after canceling, and it becomes very easy to respond.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the horizontal rolling mill according to the present invention is applied to a four-stage horizontal rolling mill 1 will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a work roll cross mill 4.
Regarding the step-type horizontal rolling mill 1, a pair of upper and lower work rolls 3, 4, backup rolls 5, 6 as a pair of upper and lower support rolls, and upper and lower work roll chock 7, 8, 9, and 10, which are the bearing boxes. FIG. 2 is a perspective view extracting and showing upper and lower backup roll chocks 11, 12, 13 and 14.

In FIG. 1, upper backup roll chocks 11 and 12 and lower backup roll chocks 1 and 12 are provided inside a pair of left and right rolling mill housings (not shown) which are installed on opposite sides of the rolled material 2 in the width direction.
3 and 14 are incorporated.

Upper backup roll bearings (not shown) are respectively built in the upper backup roll chocks 11 and 12 located on the left and right with respect to the center in the width direction of the material 2 to be rolled. 5 roll necks 5
a and 5a are supported to support a thrust force acting on the upper backup roll 5. Lower backup roll bearings (not shown) are built in the left and right lower backup roll chocks 13 and 14, respectively. The lower backup roll bearings rotatably support the roll necks 6a and 6a of the lower backup roll 6. 6 is supported.

Upper left and right backup roll chocks 1
Near the center of the bottom of each of the bases 1 and 12 has a U-shape, and hollow portions 23 and 24 are formed by the U-shape portions. In addition, the vicinity of the upper center of the left and right lower backup roll chocks 13 and 14 has a U-shape, respectively, and hollow portions 25 and 26 are formed by the U-shaped portions.

Left and right upper work roll chocks 7 and 8 are incorporated in the left and right hollow portions 23 and 24, respectively. Upper work roll bearings (not shown) are respectively built in the upper work roll chocks 7 and 8, and the roll necks 3a and 3a of the upper work roll 3 are respectively supported by these two upper work roll bearings. And
The upper work roll 3 is in contact with and supported by the upper backup roll 5.

On the other hand, the left and right lower work roll chocks 9 and 10 are incorporated in the left and right hollow portions 25 and 26, respectively. Lower work roll bearings (not shown) are respectively built in the lower work roll chock 9, 10, and the roll necks 4a, 4a of the lower work roll 4 are respectively supported by these two lower work roll bearings. Then, the lower work roll 4 contacts and is supported by the lower backup roll 6.

The horizontal rolling mill 1 shown in this embodiment is a work roll cross mill in which only the work rolls can be inclined in a horizontal plane parallel to the material 2 to be rolled. The work rolls 4 are independently and rotatably mounted on a horizontal plane about the center in the roll body length direction in the horizontal plane. Hereinafter, the rotation mechanism will be described. However, since the rotation mechanism itself is completely the same for the upper and lower work rolls 3 and 4, the description will be made using the upper work roll 3 as an example.

The rotating mechanism of the upper work roll 3 is provided with a hollow 2
Upper work roll chock 7, 8 is provided inside upper backup roll chock 11, 12 located on both sides of 3, 24.
Are sandwiched from both sides in the rolling direction (longitudinal direction of the rolled material 2).
The upper work roll rotation cylinders 15 and 16 are connected to the side surface of the upper work roll chock 7, and the upper work roll rotation cylinders 17 and 18 are connected to the side surface of the upper work roll chock 8, respectively. Then, the upper work roll rotating cylinders 15, 16, 17, and 18 incorporated in the left and right upper backup roll chocks 11 and 12 are connected to the control device 27, and a control signal from the control device 27 is transmitted to the upper work roll rotation. Working cylinders 15 and 16, 1
7 and 18, the upper work roll rotation cylinders 15, 16 and 17 built in the left and right upper backup roll chocks 11 and 12, respectively.
And work 18 to activate upper work roll chock 7, 8
Are operated in opposite directions, respectively.

Although not shown, the difference between the stroke direction of the upper work roll rotation cylinders 15, 16, 17, and 18 and the rotation direction of the upper work roll chocks 7, 8 is compensated for so that the upper work roll 3 can be smoothly moved. In order to rotate the upper work roll rotating cylinders 15 and 1
Joints are provided at the connection portions between the tip portions of 6, 17, and 18 and the side surfaces of the upper work roll chock 7, 8.

Thus, the horizontal rolling mill 1 shown in FIG.
In this case, the upper work roll 3 is installed so as to be rotatable about the center in the roll body length direction in the horizontal plane, and the upper backup roll 5 is installed without rotating.

Such a rotating mechanism is also used for the lower work roll 4 for the lower work roll rotating cylinders 19 and 2.
0, 21 and 22 are employed in exactly the same way. Therefore, the upper and lower work rolls 3 and 4 are independent of each other,
In a horizontal plane which is a plane parallel to the material 2 to be rolled, it is installed so as to be rotatable about a center portion in the roll body length direction in the center of rotation.

Further, in the horizontal rolling mill 1 shown in FIG. 1, the upper backup roll chock 11 and the upper work roll chock 7, the upper backup roll chock 12 and the upper work roll chock 8 are replaced with the roll body lengths of the upper work roll 3 and the upper backup roll 5, respectively. The connection members 32a and 32b that connect in the directions connect the lower backup roll chock 13 and the lower work roll chock 9, the lower backup roll chock 14 and the lower work roll chock 10 in the roll body length direction of the lower work roll 4 and the lower backup roll 6, respectively. Connecting members 32c and 32d are installed respectively. In FIG. 1, for convenience of explanation, the connection member 3
Only 2a is drawn out. Hereinafter, the connection member 32
The specific configuration of each of the connection members 32a to 32d will be described in detail with reference to FIGS. 1 and 2. However, since the configurations of the connection members 32a to 32d are completely the same,
This will be described with reference to a.

FIG. 2 is an explanatory view showing an engagement state of the upper backup roll chock 11 and the upper work roll chock 7 in the horizontal rolling mill 1 according to the present invention shown in FIG. 1, and FIG. 2 (b) is a front view with a part omitted, and FIG. 2 (c) is an AA of FIG. 2 (a).
It is a horizontal sectional view in a part.

FIG. 1 and FIGS. 2 (a) to 2 (c)
In the upper backup roll chock 11 located above the hollow portion 23, support member driving cylinders 30a and 31a are built in, and the center portion of the work roll body length direction when the upper work roll 3 rotates is rotated. An arc-shaped support member 28a along an arc-shaped locus centered on is built in so as to be flush with the bottom surface of the upper backup roll chock 11, and the support member driving cylinders 30a and 31a are connected to the support member 28a, The support member 28a is supported so that it can be freely inserted and removed. Therefore, by operating the support member driving cylinders 30a and 31a, the support member 28a is pushed out from the bottom surface of the upper backup roll chock 11 toward the upper surface of the upper work roll chock 7 located below, and the support member 28a is It is configured to be able to return to a position on the same plane.

Further, on the upper surface of the upper work roll chock 7, an arc-shaped groove 29a into which the extruded support member 28a is completely fitted is provided. The groove 29a is formed in an arc shape so as to fit the arc-shaped support member 28a, and is provided at a position where the support member 28a extruded by the support member driving cylinders 30a and 31a can be accommodated.

The support member driving cylinders 30a and 31a, 30b and 31b disposed on the left and right upper backup roll chocks 11 and 12 are operated, respectively, so that the support members 28a and 28b are moved to the left and right upper work roll chocks 7 and 8 respectively. The upper work roll chock 7 and the upper backup roll chock 11, the upper work roll chock 8, and the upper backup roll chock 12 arranged on the left and right are connected by fitting into the grooves 29a and 29b provided on the upper surface, respectively.
The upper work roll 3 and the upper backup roll 5 are provided with an upper work roll chock 7, 8 and an upper backup roll chock 11, 12 in the roll body length direction.
Connected via The drawing drawn in a circle in FIG. 1 shows a state in which the support member 28a is fitted in the groove 29a.

Although not shown, the left and right support member driving cylinders 30a and 31a, 30b and 31
Each of b is connected to the control device 27 and is operated by a control signal from the control device 27.

As described above, in this embodiment, the connection member 32
a is a support member driving cylinder 30a, 31a built into the upper backup roll chock 11 and the support member 2
8a and the groove 2 provided in the upper work roll chock 7
8a, and the connecting member 32b is a supporting member driving cylinder 30b, 31b and a supporting member 28b built in the upper backup roll chock 12.
And a groove 28b provided in the upper work roll chock 8
It is composed of

Since the connecting members in this embodiment are both very simple, they can be implemented at low cost and the possibility of equipment failure is low. In addition, since the support member is installed so as to be freely taken in and out, when replacing or repairing the work roll, the connection member can be released by operating the support member by a signal from the control device and then performing the same as before. .

The lower backup roll chock 13 and the lower work roll chock 9 are connected to the lower backup roll chock 14 by a connecting member 32c which is configured in exactly the same manner.
The lower work roll chock 10 and the lower work roll chock 10 are connected to each other by a connection member 32d that is configured in exactly the same manner.

Next, a situation in which the plate material is rolled using the horizontal rolling mill 1 according to the present invention configured as described above will be described. Note that this description is also made by taking the upper work roll 3 as an example, and the description of the lower work roll 4 is omitted.

Prior to rolling, a control signal is output from the control device 27 shown in FIG. 1 to the left and right upper work roll rotating cylinders 15, 16, 17, and 18, so that the left and right upper work roll chocks 7, 8 are output. Are rotated in the opposite directions to tilt the upper work roll 3 in the horizontal plane. Although the inclination angle depends on the width of the material 2 to be rolled, when the sheet width is about 2000 mm at the maximum, it is about ± 2 degrees at the maximum with respect to the center axis of the upper backup roll 5.

Further, a control signal is output from the control device 27, and the left and right support member driving cylinders 30a and 31 are driven.
By actuating a, 30b, and 31b, respectively, the support members 28a, 28b are fitted into the grooves 29a, 29b, respectively. The support members 28a and 28b are formed in an arc shape so as to follow an arc locus about the center of the work roll body length direction when the upper work roll 3 rotates, and the grooves 29a and 29b are also formed in the support member 28.
a, 28b so as to fit into it
The support members 28a, 28b are completely fitted into the grooves 29a, 29b.

By performing rolling in this state, the upper work roll 3 is tilted in a horizontal plane and the upper backup roll 5 is rolled without being tilted, thereby achieving a sufficient crown control effect and the connecting members 32a, 32b.
The upper work roll 3 is connected to the upper backup roll 5 in the roll body length direction by connecting the upper work roll chock 7 and the upper work roll chock 11, the lower work roll chock 8 and the lower backup roll chock 12. The force reduction effect can be obtained at the same time.

[0048]

[Modification] The present embodiment is a case where the present invention is applied to a four-stage horizontal rolling mill, but the present invention is not limited to such an embodiment, and is applied to a multi-stage horizontal rolling mill having four or more stages. It is also possible. For example, when the present invention is applied to a six-stage horizontal rolling mill having an intermediate roll and a backup roll as support rolls, a work roll chock and an intermediate roll chock are connected.

In the present embodiment, two work roll driving cylinders connected to the work roll chocks corresponding to the respective backup roll chocks are incorporated as a mechanism for inclining the work roll. However, the horizontal rolling mill 1 according to the present invention includes such a cylinder. The present invention is not limited to the embodiment, and any mechanism that can incline only the work roll in the horizontal plane is equally applicable. For example, a support member that can be freely taken in and out of the work roll chock may be provided, and a groove portion in which the support member fits may be provided in the backup roll chock to constitute a connection member so that the work roll is inclined.

In this embodiment, the means for connecting the connection member between the left and right work roll chock and the upper backup roll chock has been described. However, the connecting member is provided between the left and right work roll chock and the upper backup roll chock. It may be installed. Even if only one is provided, a sufficient thrust force reducing effect can be obtained.

Further, in this embodiment, the connecting members are provided between the upper work roll chock and the upper backup roll chock and between the lower work roll chock and the lower backup roll chock, respectively. When the rotating work roll is one of the upper and lower ones, a work roll chock that supports that work roll and a backup roll that supports this work roll The backup roll chock may be connected.

[0052]

According to the horizontal rolling mill of the present invention, when rolling is performed by crossing work rolls, a work roll chock and a backup roll chock are connected by a connecting member to connect the work roll and the backup roll to each roll chock. Can be connected indirectly through the roll body length direction, so that all the thrust force acting on the work roll can be received by the backup roll chock via the work roll chock, and the two thrusts acting in the opposite direction to the roll body length direction The forces can offset each other.

Therefore, the thrust force acting on the work roll can be received by the backup roll chock, and the thrust force acting on the backup roll chock can be reduced as compared with the conventional case.

Further, according to the horizontal rolling mill of the present invention, since the connecting members can be formed very easily, the horizontal rolling mill of the present invention can be realized at low cost and with less occurrence of failure.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of a horizontal rolling mill 1 according to the present invention.

FIG. 2 is an explanatory view of an upper backup roll chock 1 and an upper work roll chock 2 in the horizontal rolling mill 1 according to the present invention shown in FIG. 1, wherein FIG. 2 (a) is a side view and FIG. Front view, abbreviated, and FIG.
FIG. 2C is a horizontal cross-sectional view taken along the line AA in FIG.

FIG. 3 is an explanatory diagram showing a simplified situation when rolling is performed by a work roll cross mill.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Rolling machine 2 Rolled material 3 Upper work roll 4 Lower work roll 5 Upper backup roll (upper support roll) 6 Lower backup roll (lower support roll) 7, 8 Upper work roll chock 9, 10 Lower work roll chock 11, 12 Upper backup Roll chock 13, 14 Lower backup roll chock 28a to 28d Support member 29a to 29d Groove portion 32a to 32d Connection member

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-23411 (JP, A) JP-A-6-31307 (JP, A) JP-A-5-139113 (JP, A) JP-A-56- 74308 (JP, A) JP-B 63-17001 (JP, B2) JP-B 60-32881 (JP, Y2) JP-B 3-44324 (JP, Y2) (58) Fields surveyed (Int. ⁷ , DB name) B21B 13/14 B21B 31/02

Claims (1)

(57) [Claims] 1. A work roll comprising: a pair of upper and lower work rolls; and a pair of upper and lower support rolls for supporting the work rolls. A horizontal rolling mill that is rotatably installed and the support roll is installed without rotating, and has a circular arc shape around the center of the work roll body length direction when the work roll chock rotates. An arc-shaped support member which is provided on at least one of the upper and lower work rolls or at least one of the upper and lower support rolls along the trajectory, and which is freely movable in and out,
A connecting member provided with at least one of the upper and lower support rolls, the support roll chock, or a groove portion provided on at least one of the upper and lower work rolls, the support member being fitted to the work roll chock. Features horizontal rolling mill.