JPH05228510A - Paired cross rolling mill - Google Patents

Abstract

PURPOSE:To reduce a thrust force acting on a work roll and to miniaturize the thrust bearing mechanism. CONSTITUTION:Upper and lower pair rolls I, II are formed from upper and lower work rolls 1, 2 and upper and lower support rolls. The upper pair roll I and the lower pair roll II are arranged on the cross on the horizontal surface. Projecting parts 1a, 2a or recessed parts are provided on the outer peripheral surfaces of the upper and lower work rolls 1, 2. Recessed parts or projecting parts are formed by the projecting parts 1a, 2a or the recessed parts of the upper and lower work rolls 1, 2 on the plate material 5 and the thrust force generated on the upper and lower work rolls 1, 2 is cancelled by engaging the projecting parts respectively with the recessed parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair cross rolling machine for rolling a plate material by arranging rolls in a horizontal plane parallel to the plate material.

[0002]

2. Description of the Related Art In recent years, the requirements for the thickness accuracy of rolled products in the plate width direction have become more and more strict. Generally, the hot coil has a middle height in the plate width direction, so in order to correct the thickness distribution to cancel this, a method of attaching an initial crown to the work roll in advance, or a method of bending the work roll, etc. It has been known.

However, in the case of a method in which the work rolls are provided with crowns, the number of rolls corresponding to the rolling conditions such as the plate width and thickness of the plate material is held, and the crowns are different each time the rolling conditions change. Therefore, there is a problem that the operation rate is lowered, and in the case of the method of bending the work roll, it may be added to the work roll due to the strength of the roll neck of the work roll. Since the bending force is limited, there is a problem that it is not possible to obtain sufficient thickness distribution correction ability in the plate width direction.

Therefore, as shown in FIG. 4, an upper work roll 1 and an upper backup roll 3 and a lower work roll 2 and a lower backup roll 4 are arranged in parallel with their axes kept horizontal and are respectively placed in upper pair rolls. And a lower pair roll, and a pair roll cross type rolling machine has been developed in which the plate material 5 is rolled in a state where the axes of the upper and lower pair rolls intersect in a horizontal plane (Japanese Patent Laid-Open No. 55-649).
08). In this rolling mill, the thickness distribution in the width direction of the plate material 5 can be controlled by adjusting the intersection angle (cross angle) of the upper and lower pair rolls, and a product having a uniform plate thickness can be rolled. Is.

[0005]

However, in the case of the above-mentioned pair roll cross type rolling mill, there is a problem that an excessive thrust force is generated in the work roll because the roll is tilted in the horizontal plane for rolling. This thrust force is one of the rolling load
It has been confirmed that about 0% occurs. Therefore, unless the mechanism such as the bearing that supports the thrust load is made considerably large, the thrust receiving mechanism may be damaged, leading to a serious facility accident. Further, in the case of a pair roll cross type rolling mill, this crown control is effective in its original purpose in that it has so-called crown control capability of canceling the bending of the rolls and correcting the thickness distribution in the strip width direction. The capacity is large for wide width materials but small for narrow width materials.

On the other hand, in order to solve the problem of the thrust force acting on the roll as described above, in a rolling mill of the pair roll cross system, a system in which the work roll is inclined by a minute angle has been proposed (Japanese Patent Laid-Open No. 59-137104). issue). However, in the case of this system, there is no improvement in the drawback unique to the roll cloth system that the crown control capability is small when the plate material is narrow.

Therefore, the present invention makes it possible to prevent an excessive thrust force from being generated in the roll and eliminate the need to increase the size of the thrust receiving mechanism, and to significantly increase the crown control capability for a narrow plate material. The purpose is to provide a pair cross rolling machine that can be expanded.

[0008]

In order to solve the above-mentioned problems, the present invention forms an upper pair roll by an upper work roll and an upper support roll arranged in parallel, and a lower work roll and a lower support arranged in parallel. A lower pair roll is formed by the roll, the upper pair roll and the lower pair roll are arranged to cross each other in a horizontal plane, and a convex portion or a concave portion is provided on the outer peripheral surfaces of the upper and lower work rolls.

[0009]

Since the upper and lower work rolls are provided with the protrusions or recesses, the plate members are provided with recesses or protrusions corresponding to the protrusions or recesses, and the concavo-convex portions are engaged with each other. The thrust force that acts is canceled.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
Upper and lower work rolls 1, 2 and upper and lower work rolls 1,
2 as upper and lower backup rolls 3 and 4 as support rolls arranged in parallel with each other, and upper and lower pair rolls I and II are formed. And the concave portions 3a and 4a corresponding to the convex portions 1a and 2a are formed on the outer peripheral surfaces of the central portions of the backup rolls 3 and 4, and the convex portions 1a and 2a are formed into the concave portions 3a and 4a in the roll kiss portion. And the upper and lower pair rolls I and II are cross-arranged so as to intersect each other in the horizontal plane with the rolling line L through which the plate material 5 passes sandwiched therebetween.

When the plate material 5 is rolled between the upper and lower work rolls 1 and 2, the convex portions 1a and 2 of the upper and lower work rolls 1 and 2 are rolled.
Since the concave portions are formed on the front and back surfaces of the plate member 5 by a, the convex portions 1a and 2a and the concave portions are in mesh with each other. Therefore, upper pair roll I and lower pair roll II
By crossing, the thrust force generated in the upper work rolls 1 and 2 is canceled. That is, when the pair cross rolling mill is operated, a thrust force Q is generated on the upper work roll 1 as shown in FIG.
When a and the recess of the plate member 5 are in mesh with each other, a force (thrust reaction force) for restraining the thrust force Q on the plate member 5
F is generated, and the thrust force of the upper work roll 1 can be zero or a value close to zero. Similarly, the thrust force of the lower work roll 2 can be zero or a value close to that. As a result, it becomes unnecessary to apply a thrust reaction force to the upper and lower work rolls 1 and 2, and the thrust receiving mechanism can be downsized. Furthermore, since no excessive thrust force is generated in the upper and lower work rolls 1 and 2, thrust force is not generated in the upper and lower backup rolls 3 and 4 as well.

Further, in the present invention, as described above, the convex portions 1a and 2a are formed in the central portions of the work rolls 1 and 2, so that the conventional rolls can be used not only for the wide plate member 5. It is possible to improve the defect of the crown control capability for the narrow plate member 5 which is a defect of the cross system, and to greatly expand the crown control capability for the narrow member.

In the above embodiment, the work rolls 1,
2 shows the case where the convex portions 1a and 2a are formed in the central portion of the second roll 2 and the concave portions 3a and 4a are formed in the central portion of the backup rolls 3 and 4, for example, as shown in FIG. 1, 2, concave portions 1b, 2b are formed on both sides of the central convex portions 1a, 2a, and backup rolls 3, 4 are formed with convex portions 3b, 4b on both sides of the central concave portions 3a, 4a. Alternatively, or as shown in FIG. 3B, the work rolls 1 and 2 are provided with concave portions 1b and 2b at positions deviated from the central portion, thereby forming the convex portion 1 at the central portion.
a and 2a are formed, and the backup rolls 3 and 4 are formed with convex portions 3b and 4b corresponding to the concave portions 1b and 2b, thereby forming concave portions 3a and 4a in the central portion and arranging them vertically asymmetrically. Or as shown in (c) of FIG.
A convex portion 1a is formed in the central portion of the upper work roll 1, a concave portion 2b is formed in the central portion of the lower work roll 2, a concave portion 3a is formed in the central portion of the upper backup roll 3, and the central portion of the lower work roll 4 is formed. The work rolls 1 and 2 may be provided with a convex portion 4b, or only the work rolls 1 and 2 may be provided with a concave portion and a convex portion. But, for example, above,
Lower work rolls 1, 2 and upper, lower backup rolls 3,
It is of course possible to employ a rolling mill having a six-stage roll structure in which an intermediate roll is interposed as a support roll between the four rolls, and various changes can be made without departing from the scope of the present invention.

[0015]

As described above, according to the pair cross rolling machine of the present invention, since the cross rolls are integrally arranged with the supporting rolls and the lower work roll is provided with the convex portion or the concave portion, the convex portion or the concave portion is provided. By engaging with the plate material, the thrust force generated in the upper work roll and the support roll can be set to zero or a value close to zero, and it is possible to eliminate the need to increase the size of the thrust receiving mechanism. It can be applied to hot strip rolling mills, hot plate rolling mills, cold rolling mills of relatively thick materials, etc., and also has a configuration in which a convex portion is provided in the central portion of the upper and lower work rolls. As a result, the crown control capability for a narrow plate material can be significantly improved, and other excellent effects are exhibited.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a pair cross rolling mill of the present invention.

FIG. 2 is a schematic diagram showing a relationship between thrust force and thrust reaction force.

FIG. 3 shows another embodiment of the present invention.
(B) and (C) are schematic diagrams showing examples of roll shapes.

FIG. 4 is a schematic view showing an example of a conventional pair cross rolling mill.

[Explanation of symbols]

 I Upper Pair Roll II Lower Pair Roll 1 Upper Work Roll 1a Convex 1b Recess 2 Lower Work Roll 2a Convex 2b Recess 3 Upper Backup Roll (Upper Support Roll) 4 Lower Backup Roll (Lower Support Roll)

Claims (1)

[Claims] 1. An upper pair roll is formed by an upper work roll and an upper support roll which are arranged in parallel, and a lower pair roll is formed by a lower work roll and a lower support roll which are arranged in parallel, and the upper pair roll and the lower pair roll are formed. A pair cross rolling mill having a configuration in which the and are crossed in a horizontal plane, and a convex portion or a concave portion is provided on the outer peripheral surfaces of the upper and lower work rolls.