JP2506394B2 - Work roll horizontal support device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work roll horizontal support device for a plate rolling mill, and more particularly to a work roll horizontal support device suitable for coping with a change in diameter of the work roll.

[Conventional technology]

When rolling a hard material or a difficult-to-process material, a rolling mill is used that reduces the diameter of the work roll and reduces the rolling load. In this type of rolling mill, it is necessary to prevent the work roll having a small diameter from bending in the horizontal direction, and therefore a work roll horizontal support device is installed.

This work roll horizontal support device generally includes an idle roller that supports a horizontal component force of the work roll, a support bearing that supports the idle roller, and a positioning device that supports the horizontal force from the idle roller and the support bearing. In the prior art, the idle roller and the supporting bearing have been so arranged that their positions can be adjusted in a substantially horizontal direction by a positioning device as described in JP-A-61-186112.

[Problems to be solved by the invention]

By the way, in recent years, in this type of rolling mill, various rolling materials can be rolled by one rolling mill. Therefore, the working rolls are replaced with working rolls having different diameters, and the working rolls having the optimum diameters corresponding to the rolling materials are used. Is desired to be selectable. However, in the rolling mill equipped with the above-mentioned conventional work roll horizontal direction supporting device, no consideration is given to changing the work roll diameter drastically, and for a large diameter change such as replacement of the work roll. There was a problem that it was difficult to deal with.

That is, in the conventional work roll horizontal direction supporting device,
By adjusting the horizontal position of the idle roller and the support bearing, it is possible to cope with wear of the work roll and diameter change of about 10 to 15% which is the polishing amount, but 1.5 to 2.0 times as much as when replacing the work roll. Since it was originally not designed for such a large diameter change, it would be structurally impossible or it would be necessary to replace members other than the work roll.
It was difficult to handle.

An object of the present invention is to provide a horizontal support device for a work roll of a rolling mill, which can easily cope with a large change in diameter of the work roll.

[Means for solving problems]

The purpose is to install the idle roller and support bearing
It is achieved by a work roll horizontal direction supporting device characterized in that the work roll horizontal support device is provided with a moving means capable of moving in a direction having a greater gradient than a gradient with respect to a pass line in a direction of a load applied from the work roll to the idle roller.

[Action]

When the idle roller and the support bearing are moved in a direction having a gradient larger than the gradient with respect to the pass line in the direction of the load applied from the work roll to the idle roller, the geometry of the work roll and the idle roller and the support bearing is The scientific conditions can be made almost constant regardless of the work roll diameter. Therefore, the work roll can always be stably supported even if the diameter of the work roll changes significantly. Further, since it is possible to cope with a large change in diameter of the work roll only by adjusting the positions of the idle roller and the support bearing, the work roll can be replaced easily and in a short time.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 and 2 show a work roll horizontal support device for a rolling mill according to a first embodiment of the present invention.

In FIG. 1, the rolling mill is a 6-high rolling mill having a work roll 1, an intermediate roll 2 and a reinforcing roll 3. The working roll 1 is a path of rolled material with respect to the axial center positions of the intermediate roll 2 and the reinforcing roll 3. It is arranged with a predetermined offset in the direction of the line L. Most of the rolling load generated between the upper and lower work rolls 1 is transmitted to the reinforcing roll 3 in the vertical direction via the intermediate roll 2 and is supported by the housing 4. Since the work roll 1 has a small diameter, it is necessary to prevent the work roll 1 from bending in the horizontal direction. For this purpose, the work roll horizontal support device 5 of the present invention is installed for each work roll 1.

In FIG. 1, in order to make it easy to understand the correspondence to the diameter change of the work roll 1 described later, the case where the work roll 1 has a large diameter is shown above the pass line L through which the rolled material passes, and the work roll 1 is shown below. The case of a small diameter is shown.

The work roll horizontal direction support device 5 includes an idle roller 6 that supports the horizontal component force of the work roll 1 and a support bearing 7 that supports the idle roller 6, and the support bearing 7 is rotatably supported by a frame 8. In addition, the idle roller 6 is held on the frame 8 by springs 9 (see FIG. 2) at both ends thereof as an example. As a result, the idle roller 6, the support bearing 7 and the frame 8 constitute a support unit 10 that integrally supports the horizontal component force of the work roll 1.

The support bearing 7 is composed of a plurality of divided rollers 7a and a plurality of divided rollers 7b whose axes are separated from each other, which are alternately arranged in a zigzag pattern in the vertical direction. The idle roller 6 is divided into the divided rollers 7a and the divided rollers 7a. It is supported on the valley bottom between the roller 7b. This enables a stable support of the idle roller 6 with a compact structure. The structure of the support bearing 7 is the same as the prior application Japanese Patent Application No. 61-18.
It was disclosed as an invention in 5121, and for details, refer to it.

The support unit 10 including the idle roller 6, the support bearing 7 and the frame 8 is positioned by the positioning device 11 and is supported by the horizontal force thereof. Positioning device
11 is a support beam 12 loaded in the housing 4 of the rolling mill
And a screw-type drive device 13 mounted on the support beam 12, and a linear motion bearing 15 composed of a circulating ball bearing is mounted on the tip of the threaded rod 14 of the drive device 13 for the purpose described later, The horizontal force support of the support unit 10 is carried out via this linear motion bearing 15.

Further, on the frame 8 of the supporting unit 10, the idle roller 6 and the supporting bearing 7 are moved in a direction having a larger gradient than the gradient of the direction W of the load applied from the work roll 1 to the idle roller 6 with respect to the pass line L. A moving means 16 enabling it is provided. This transportation 16
Consists of guide rails 17 installed in the housing 4 of the rolling mill and a plurality of circulating ball bearings mounted on both end faces of the frame 8 of the support unit 10 and movably fitted on the guide rails 17. It consists of linear motion bearings 18. As a result, the support unit 10 can be moved accurately along the guide rails 17, and the friction coefficient is reduced to reduce the hysteresis. Further, such a movement of the support unit 10 causes a displacement between the positioning device 11 and the support unit 10. This displacement is absorbed by the linear motion bearing 15 described above.

The moving means 16 preferably includes the support unit 10, contact points of the upper and lower work rolls 1, the work roll 1 and the idle roller 6.
The guide rail 17 can move in a direction substantially along a straight line connecting the contact point of the guide rail 17 and the guide rail 17, and therefore, the guide rail 17 is inclined in the same direction. As an example, the gradient is about 50 degrees with respect to the pass line L.

Next, the operation principle of the work roll horizontal direction supporting device 5 configured as described above will be described with reference to FIG.

In FIG. 3, the x-axis shows the pass line L, and the y-axis is a line connecting the axial centers of the upper and lower work rolls 1. Therefore, the origin O of this coordinate system serves as a contact point between the upper and lower work rolls 1. The solid line shows the case of a small-diameter work roll, and the dotted line shows the case of exchanging a small-diameter work roll for a large-diameter work roll while maintaining the geometrical conditions of the work roll, the idle roller and the support bearing constant. The radius of the small-diameter work roll 1 is set to rA, the radius of the large-diameter work roll 1 is set to rB, and the gradient between the line passing through the axis of the work roll 1 and the idle roller 6 and the x-axis is set to θ. The contact point between the small-diameter work roll 1 and the idle roller 6 is A, and the large-diameter work roll 1 and the idle roller 6 are
Let B be the contact point with. The coordinates of the points A and B are expressed by the following equations.

Ax = rAcosθ Ay = rA (1 + sinθ) Bx = rBcosθ By = rB (1 + sinθ) This is a series expansion.

A similar equation holds for the coordinates of the point B, and the gradient of the straight line connecting the O point and the A point and the gradient of the straight line connecting the O point and the B point are both represented by the following equations regardless of the radius of the work roll. The gradient becomes α.

Here, the gradient θ between the line passing through the axis of the work roll 1 and the idle roller 6 and the x-axis is determined by the interference between the idle roller 6 and the intermediate roll 2 and the pass line side split roller of the support bearing 7 and the pass line L. Work roll 1 without interference
It is determined from the minimum diameter. If this θ is set as θ ≒ 0.2 (radian), That is, if the support unit 10 is moved in accordance with the gradient of α = 1.22 (radian) = 50 degrees, the diameter change of the work roll 1 remains constant while the geometric conditions of the work roll 1, the idle roller 6, and the support bearing 7 remain constant. Can correspond to.

In the work roll horizontal support device 5 of this embodiment, when the work roll 1 is replaced, for example, when the small diameter roll on the lower side in FIG. Is moved to the side opposite to the work roll 1, the support unit 10 moves in the direction in which the linear motion bearing 16 is guided by the guide rail 17 and has a slope of about 50 degrees. Therefore, according to the above-mentioned principle, it is possible to cope with the diameter change of the work roll 1 while the geometrical conditions of the work roll 1, the idle roller 6 and the support bearing 7 remain constant, and the diameter of the work roll 1 changes greatly. However, the work roll 1 can always be stably supported.

Further, since it is possible to cope with a large diameter change of the work roll 1 only by adjusting the position of the support unit 10 without replacing the components of the work roll horizontal direction supporting device 5, the work roll can be easily replaced. It can be carried out in a short time.

A second embodiment of the present invention will be described with reference to FIG.
In the above-described embodiment, the moving direction of the positioning device 11 by the driving device 13, that is, the load supporting direction and the direction of the horizontal force supported by the supporting unit 10 are substantially aligned with each other.
The load-supporting direction may be matched with the moving direction of the supporting unit 10, and FIG. 4 shows such an embodiment.

That is, the positioning device 20 of this embodiment includes a support beam 21.
Away from the pass line L, and the threaded rod of the drive unit 22
23 is arranged so that it has almost the same slope as the guide rail 24,
Its tip is directly attached to the frame 8 of the support unit 10. In this case, the horizontal force transmitted from the work roll 1 to the support unit 10 is supported not only by the positioning device 20 but also by a part thereof by the guide rail 24. For this reason, in this embodiment, the guide rail 24 is made thicker and stronger than the guide rail 17 of the first embodiment, and among the circulating ball bearings constituting the linear motion bearing 25, the one on the horizontal force supporting side 25a.
Has a structure with a larger load capacity than the other side 25b.

FIG. 5 shows a work roll horizontal support device according to still another embodiment of the present invention. In the above embodiment,
The moving means 16 is configured such that the movement of the support unit 10 is performed linearly by the guide rails 17 and 24.
However, the moving direction of the support unit 10 does not necessarily have to be a strictly linear direction, and may be an arc,
FIG. 5 shows an embodiment provided with such a moving means.

That is, in this embodiment, the moving means 30 is composed of an arm 31 mounted on the frame 8 of the supporting unit 10 and a fulcrum 32 for rotatably supporting the arm 31, and the fulcrum 32 is provided on the housing 4 of the rolling mill. It is provided. This allows
The contact point between the idle roller 6 and the work roll 1 moves on a curve indicated by g, and the inclination of the curve g with respect to the pass line L is approximately 50 degrees.

As can be seen from the figure, the upper arm 31 and the fulcrum
32 pivots the lower support unit 10 and lowers the lower arm 31
And the fulcrum 32 pivots the upper support unit 10,
The upper and lower arms 31 and 32 are configured and arranged with their phases shifted so as not to interfere with each other. Also positioning device
The tip 35 of the threaded rod 34 of the drive device at 33 is rounded and engages the frame 8 of the support unit 10 with the curved surface of the radius, and the rotation between the threaded rod 34 and the support unit 10 due to the pivoting of the support unit 10. It absorbs the angular deviation of.

Although the gradient of the support unit 10 in the moving direction is set to 50 degrees in the above embodiments, the present invention is not limited to this. As described with reference to FIG. 3, the inclination is 50 degrees, and the inclination θ between the line passing through the axis of the work roll 1 and the idle roller 6 and the x-axis is 0.2 and the angle is below. This θ
When the work roll 1 is used in a relatively large diameter range, it can be changed because of the space.
In particular, in the case of the swivel type as in the embodiment of FIG. 5, θ can be reduced as the work roll diameter increases.

The movement direction of the support unit 10 is the upper and lower work rolls 1
Is preferably in the direction along a straight line connecting the contact point of the work roll 1 and the contact point of the work roller 1 and the idle roller 6, but the direction W of the load applied from the work roll 1 to the idle roller 6
(Work roll 1 and idle roller 6 that define the above θ
If it is possible to move in a direction having a greater gradient than the direction of the line passing through the axis of the work roll, it is possible to cope with a change in the work roll diameter to a considerable extent.

〔The invention's effect〕

As is clear from the above, according to the present invention, it is possible to cope with a large diameter change of the work roll only by adjusting the positions of the idle roller and the support bearing, so that the work roll can be easily replaced in a short time. It is possible to easily select the optimum work roll diameter.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a work roll horizontal direction support device according to an embodiment of the present invention, FIG. 2 is a plan view of the work roll horizontal direction support device, and FIG. 3 is a motion work roll. FIG. 4 is a schematic view for explaining the operation principle of the horizontal direction supporting device, FIG. 4 is a partial sectional side view showing a work roll horizontal direction supporting device according to another embodiment of the present invention, and FIG.
FIG. 6 is a partial sectional side view showing a work roll horizontal direction supporting device according to still another embodiment of the present invention. Explanation of symbols 1 ... Work roll 5 ... Work roll horizontal support device 6 ... Idle roller, 7 ... Support bearing 8 ... Frame, 10 ... Support unit 11 ... Positioning device, 16 ... Movement device 17 ...... Guide rails, 18 …… Linear motion bearings

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Yasuda 502 Jinrachicho, Tsuchiura-shi, Ibaraki Prefecture Machinery Research Laboratory, Hitachi, Ltd. In-house (72) Inventor Takao Sakanaka 3-1-1 Sachimachi, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory (56) References JP-A-61-186112 (JP, A)

Claims (7)

(57) [Claims] 1. A rolling mill comprising: an idle roller for supporting a horizontal component force of a work roll; a support bearing for supporting the idle roller; and a positioning device for supporting the horizontal force from the idle roller and the support bearing. In the work roll horizontal direction support device, provided is a moving means for moving the idle roller and the support bearing in a direction having a gradient larger than a gradient with respect to a pass line in a direction of a load applied from the work roll to the idle roller. A horizontal support device for work rolls. 2. A moving direction of the moving means is a direction substantially along a straight line connecting a contact point between the upper and lower work rolls and a contact point between the work roll and the idle roller. The horizontal support device for the work roll according to the item. 3. The work roll horizontal direction supporting device according to claim 1, wherein the moving direction of the supporting means is a direction in which the gradient is approximately 50 degrees. 4. The moving means comprises a guide rail installed in a housing of a rolling mill and a linear motion bearing mounted on a frame supporting the support bearing and moving on the guide rail. The work roll horizontal direction supporting device according to claim 1. 5. The work roll horizontal direction supporting device according to claim 4, wherein the positioning device is installed so that a load supporting direction thereof substantially coincides with a direction of the horizontal force. . 6. The positioning device is installed so that a load supporting direction thereof substantially coincides with the moving direction, and a part of horizontal force of the positioning device is supported by the guide rail. The work roll horizontal direction support device according to item 4. 7. The apparatus according to claim 1, wherein the moving means comprises an arm mounted on a frame for supporting the support bearing, and a fulcrum for rotatably supporting the arm. Work roll horizontal support device.