JPS62161413A - Rolling mill - Google Patents

Abstract

PURPOSE:To prevent a work roll of a small diameter from breaking by providing stripper guides in front and in rear of the work roll of a small diameter and disposing a supporting mechanism of a horizontal bending for the work roll of the small diameter at the inside of stripper guide. CONSTITUTION:The upper stripper guides 9 to guide the rolling material S are provided in front and in rear of the work roll 1 of a small diameter and the lower stripper guides 10 are disposed before and behind the work roll of a large diameter. A supporting block 15 for a pad is disposed on the guide 9 with a prescribed interval in the longitudinal direction through a sim 24 to fit the pad 17 on the opposed surface to the roll 1 of the block 15. In this case, the clearance between the pad 17 and the roll 1 is set adjustably. When the roll of the small diameter 1 is deflected horizontally, the deflection is supported by the guide 9 through the pad 17. Therefore, the excess deflection of the roll 1 is checked to prevent the breaking of the roll 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling mill capable of preventing bending of small-diameter work rolls due to horizontal force in the longitudinal direction of a rolled material.

[Prior Art] Examples of conventional rolling mills in which upper and lower work rolls have different diameters are shown in Figs. 8 and 9, with Fig. 8 showing an example of a 4-high rolling mill, and Fig. 9 showing an example of a 5-high rolling mill. be.

In Fig. 8, 1 is a small-diameter work roll, 2 is a large-diameter work roll, 3 and 4 are backup rolls that reinforce work rolls 1 and 2, S is a rolled material, and the rolled material S is a small-diameter work roll 1 and a large-diameter work roll. It is rolled by work rolls 2.

In FIG. 9, an intermediate roll 5 is interposed between the small-diameter work roll 1 and the backup roll 3, and the intermediate roll 5 and the large-diameter work roll 2 can be driven by a drive motor 6.7.

[Problems to be Solved by the Invention] However, in the rolling with different diameter rolls shown in FIG. A horizontal force in the offset direction acts on the roll 1, and this horizontal force causes the small diameter work roll 1 to be largely deflected in the longitudinal direction of the rolled material, resulting in a change in the thickness of the rolled material or the risk of the small diameter work roll breaking. However, in the case of reverse rolling, horizontal force is necessarily generated, so the risk of plate thickness variation or small diameter work roll breakage is even greater.

In addition, in the rolling with different diameter rolls shown in Fig. 9, the small diameter work roll 1 is offset in the rolling material progressing direction so that the horizontal force Fr acting on the small diameter work roll 1 due to the rolling force and the horizontal force Ft due to the drive torque are balanced. However, even in this case, there are times when the balance cannot be maintained due to rolling force disturbances, unsteady torque response speeds such as during biting, etc. In this case, the small diameter work roll 1 has excessive roll deflection. There is a risk that the thickness of the rolled material may change or the small diameter work roll may break.

Furthermore, in order to prevent the small-diameter work roll from deflecting in the horizontal direction, there is a cluster-type rolling mill in which the small-diameter work roll is held down by a large number of presser rolls, but this rolling mill has a complicated structure. There's a problem.

In view of the above-mentioned circumstances, the present invention has been made with the objective of reducing bending due to horizontal force in the longitudinal direction of the rolled material of the small-diameter work roll with a simple structure when rolling is performed using the small-diameter work roll.

[Means for Solving the Problems] The present invention provides a rolling mill in which at least one of a pair of upper and lower work rolls is a small-diameter work roll, in which a stripper guide disposed before and after the small-diameter work roll is provided with a small-diameter work roll. The structure includes a horizontal bending support mechanism that supports horizontal bending of the rolled material in the longitudinal direction.

[Function] Horizontal force acts on the small-diameter work roll in the longitudinal direction of the rolled material due to the rolling force, and the horizontal force causes horizontal bending of the small-diameter work roll. Supported by a bending support mechanism.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 to 4 show one embodiment of the present invention, in which the same reference numerals as those shown in FIGS. 8 and 9 are given the same reference numerals. 8 is a roller table for feeding the rolled material S;
9 is an upper stripper guide arranged before and after the small diameter work roll 1 to guide the rolled material S; 10 is a lower stripper guide arranged before and behind the large diameter work roll 2 to guide the rolled material S. It is.

The upper stripper guide 9 has a beam shape with an abbreviated cross-sectional shape, and has protrusions 1 at both ends in the width direction of the rolled material S.
1 is fixed to the axle box 12, which rotatably supports the small-diameter work roll 1. The axle box 12, which rotatably supports the small-diameter work roll 1, is fitted into the window portion of the housing 13 so as to be movable up and down. The protrusion 11 is fitted, and the protrusion 1
The upper stripper guide 9 is positioned by dropping the stripper guide 1 into the groove 14, or by dropping the stripper guide 9 into the groove 14 and then fixing it with a screwdriver or the like.

In the longitudinal direction of the upper stripper guide 9, pad support blocks 15 having a U-shaped planar shape are disposed at required intervals via shims 24, and the pad support blocks 15 and shims 24 are connected to the upper stripper by bolts 18. A small diameter work roll 1 fixed to a guide 9 and a pad support block 15
A pad 17 is fitted on the surface facing the pad 17.
can be fixed and positioned relative to the pad support block 15. Further, the pad 17 protrudes from the pad support block 15 toward the small-diameter work roll 1 so that it can come into contact with the outer periphery of the small-diameter work roll 1.

The pad support block 15 is provided with a taper facing in the vertical direction on the side opposite to the pad, and a block 25 having a taper that comes into contact with a part of this taper is inserted between the pad support blocks 15 and is connected to the taper of the block 25. By abutting against each other, the clearance between the pad 17 and the small diameter work roll 1 can be adjusted. That is, an elongated hole 26 extending in a direction parallel to the traveling direction of the rolled material S is provided on the surface of the pad support block 15, and the contact adjustment between the taper part of the block 25 and the taper part of the pad support block 15 is performed using shims. This can be done by adjusting the thickness of 24.

The block 25 can be fixed in position relative to the upper stripper guide 9 by bolts 27.

Note that the material of the pad 17 is a bearing metal, a sintered alloy, a synthetic resin metal, or the like.

During rolling, a clearance is provided between the small-diameter work roll 1 and the pad 17, and the clearance can be set by setting the clearance C on both sides as shown in FIG.
+, C2 (see FIG. 3) is set to C+ =02-C, and the clearance C3 at the center is set to C3=C+δ. When rolling is performed after setting the clearance in this way, a horizontal force acts on the small diameter work roll 1 in the offset direction due to the rolling force, and the small diameter work roll 1 is bent in the longitudinal direction of the rolled material S due to horizontal bending. However, once the outer periphery of the small-diameter work roll 1 comes into contact with the pad 17, the small-diameter work roll 1 does not deform in the horizontal direction any more. Therefore, the deflection due to the horizontal bending of the rolled material S in the longitudinal direction of the small diameter work roll 1 becomes a constant curve, and the shape of the rolled material S can be controlled, and excessive deflection can be prevented, so the small diameter work roll 1
There is also no risk of it breaking.

If the diameter of the small-diameter work roll 1 changes due to modification, the height of the pad support block 25 is adjusted using the shim 24 so that the center of the pad 17 and the center of the small-diameter work roll 1 are aligned.

6 and 7 are examples of the upper stripper guide applied to the rolling hall of the present invention. In this embodiment, recesses 19 are provided at required intervals in the longitudinal direction of the upper stripper guide 9. A groove 20 extending vertically is provided in the side wall of the recess 19, and a shaft 22 rotatably supporting a support roll 21 parallel to the small-diameter work roll 1 is fitted into the groove 20, and the shaft 22 is positioned by falling. has been done.

A liner 23 made of bearing metal, sintered metal, synthetic resin metal, etc. is interposed between the lower outer circumference of the support roll 21 and a part of the recess 19 of the upper stripper guide 9. It can be supported on the upper stripper guide 9 via the liner 23. Also, the rotation center Ch of the support roll 21 is the small diameter work roll 1.
When the support roll 21 receives a horizontal force from the small-diameter work roll 1, the support roll 21 is pushed downward and hits the liner 23 without jumping upward. It is now accessible.

During rolling, a horizontal force in the offset direction acts on the small-diameter work roll 1 due to the rolling force, and the small-diameter work roll 1 is bent in the longitudinal direction of the rolled material S due to horizontal bending, and the outer periphery of the small-diameter work roll 1 is bent to the support roll 21. The horizontal force that abuts and is transmitted to the support roll 21 is transmitted from the liner 23 to the upper stripper guide 9 and supported. In this way, horizontal bending of the small-diameter work roll 1 due to horizontal force may be supported via the support roll 21.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can also be applied to rolling mills with 4-high or 5-high switching (horizontal bending of small-diameter work rolls of 4-high or 5-high switching rolling mills). When installing a stripper guide to catch the rolling mill, the small diameter work roll and stripper guide will be inserted in the position where the large diameter work roll is installed when the mill is used as a 4-high rolling mill, so make sure to have enough space. (the length of the stripper guide in the longitudinal direction of the rolled material can be increased), it can also be applied when small-diameter work rolls are installed below the rolling line or both, and within the scope of the gist of the present invention. Of course, various changes may be made.

[Effects of the Invention] According to the rolling mill of the present invention, even if a horizontal force acts on the small-diameter work roll in the longitudinal direction of the rolled material and the small-diameter work roll undergoes horizontal bending, the deflection due to the horizontal bending is avoided by the stripper guide. Since the small diameter work roll is supported by
Furthermore, since the horizontal bending curve of the small-diameter work roll can be adjusted, variations in plate thickness can be controlled and plates with good shapes can be obtained, and various other excellent effects can be obtained.

[Brief explanation of drawings]

Figure 1 is a detailed explanatory diagram of the present invention, Figure 2 is a detailed diagram of an example of a stripper guide for the small diameter work roll portion of the rolling mill in Figure 1, Figure 3 is a plan view of Figure 2, and Figure 4. is a detailed view of section IV in Figure 3, Figure 5 is an explanatory diagram of the clearance formed between the small diameter work roll and the stripper guide in the rolling mill of Figure 1, and Figure 6 is a diagram used in the rolling mill of the present invention. FIG. 7 is a detailed view of another example of a stripper guide for a small-diameter work roll portion that is
9 and 9 are explanatory diagrams of a conventional rolling mill. In the figure, 1 is a small diameter work roll, 2 is a large diameter work roll, and 9
10 is an upper stripper guide, 10 is a lower stripper guide, 15 is a pad support block, 17 is a pad, 21 is a support roll, and 23 is a liner. Front 2 Figures 4 Figure 5 -, 1 position Figure 3

Claims (1)

[Claims] 1) In a rolling mill in which at least one of a pair of upper and lower work rolls is a small-diameter work roll, horizontal bending of the small-diameter work roll in the longitudinal direction of the rolled material is supported by stripper guides arranged before and after the small-diameter work roll. A rolling mill characterized by being equipped with a horizontal bending support mechanism.