JP3067386B2 - Horizontal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, the requirements for the thickness accuracy of a rolled product in the sheet width direction have become increasingly severe. Generally, a hot coil has an intermediate height in the plate width direction. To correct the thickness distribution so as to cancel this, a method of attaching an initial crown to the work roll in advance, or a method of bending the work roll is used. It has been known.

However, in the case of a method of attaching a crown to a work roll, a number of rolls corresponding to a rolling condition such as a plate width and a thickness of a plate material are held, and a different crown is set every time the rolling condition changes. The work roll has to be replaced, and this causes a problem of lowering the operation rate. On the other hand, in the case of bending the work roll, the work roll may be added to the work roll due to the strength of the roll neck. Since the bending force is limited, there is a problem that a sufficient ability to correct the thickness distribution in the plate width direction cannot be obtained.

Therefore, as shown in FIG. 4, the upper work roll 1 and the upper backup roll 3 and the lower work roll 2 and the lower backup roll 4 are arranged in parallel while keeping their axes horizontal, and the upper pair rolls are respectively arranged. A pair-roll cross type rolling mill has been developed in which the plate material 5 is rolled while the lower and upper pair rolls are configured so that the axes of the upper and lower pair rolls intersect in a horizontal plane (JP-A-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 crossing angle (cross angle) of the upper and lower pair rolls, so that a product having a uniform thickness can be rolled. It is.

[0005]

However, in the case of the above-mentioned roll mill of the pair roll cloth type, there is a problem that an excessive thrust force is generated in the work rolls because the rolls are rolled while being inclined in a horizontal plane. This thrust force is 1 of the rolling load.
It has been confirmed that approximately 0% occurs. Therefore, unless a mechanism such as a bearing for supporting a thrust load is made to be considerably large, the thrust receiving mechanism may be damaged, leading to a serious equipment accident. In the case of a pair roll cloth type rolling mill, the crown control is effective for the original purpose in that it has a so-called crown control capability of correcting the thickness distribution in the sheet width direction by canceling the bending of the roll. The drawback is that the capacity is large for wide materials but small for narrow materials.

Accordingly, the present invention prevents the need for increasing the size of the thrust receiving mechanism by preventing the generation of an excessive thrust force on the work roll, and greatly enhances the crown control capability for a narrow plate material. It is an object of the present invention to provide a horizontal cross-rolling mill that can be expanded to a minimum.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises an upper and lower work roll and an upper and lower backup roll for supporting the upper and lower work rolls. At both ends of the roll, a small-diameter portion that gradually becomes smaller toward both ends is formed, and at both ends of the upper and lower backup rolls, the upper and lower work rolls gradually correspond to the small-diameter portions of the lower work roll toward both ends. A large diameter portion having a large diameter is formed, and only the upper and lower work rolls are arranged to intersect in a horizontal plane.

[0008]

When the small-diameter portion of the work roll and the large-diameter portion of the backup roll correspond to each other, the axial positions of both rolls are mechanically connected, so that the thrust acting between the work roll and the backup roll is obtained. Forces can approach zero. In addition, since only upper and lower work rolls each having a small-diameter portion formed at both ends are crossed, the crown control ability for a narrow plate material is expanded.

[0009]

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 and 2 and the upper and lower work rolls 1
In the horizontal rolling mill provided with the upper and lower backup rolls 3 and 4 for supporting the work rolls 2, the tapered small-diameter portions 1a and 2a are formed at both ends of the work rolls 1 and 2 so as to gradually decrease in diameter toward both ends. And large diameter portions 3a, 4a having diameters gradually increasing toward both ends are formed on both ends of the backup rolls 3, 4, respectively.
2 are formed so as to correspond to the small diameter portions 1a, 2a, and only the upper and lower work rolls 1, 2 are arranged so as to intersect in a horizontal plane with a rolling line L through which the plate material 5 passes.

In the present invention, tapered small diameter portions 1a, 2a formed at both ends of upper and lower work rolls 1, 2 are provided.
Rolling work is performed in a state where the tapered large diameter portions 3a, 4a formed at both ends of the upper and lower backup rolls 3, 4 correspond to each other. The generation of force can be prevented.
That is, the small diameter portions 1a, 2 of the upper and lower work rolls 1, 2
a and large diameter portions 3a, 4 of upper and lower backup rolls 3, 4
a and the lower and upper work rolls 1 and 2 are engaged with the upper and lower backup rolls 3 and 4, respectively, so that the positions in the axial direction are mechanically connected. Work rolls 1 and 2
And the thrust force acting between the upper and lower backup rolls 3 and 4 can be set to zero or a value close to zero. As a result, it is not necessary to equip a large thrust receiving mechanism, and the thrust receiving mechanism Can be reduced in size.

Since the tapered small-diameter portions 1a and 2a are formed at both ends of the work rolls 1 and 2, the plate material 5 between the upper and lower work rolls 1 and 2 has a large thickness at both ends. ,
Rolling is performed at the central portion so that the plate thickness is reduced. Accordingly, as the speed distribution shown in FIG. 2 accompanies this, the feed speed of the plate material 5 becomes slower toward the width end portion than the center portion, so that the upper and lower work rolls 1 and 2 are correspondingly reduced. The thrust force acting between the plate member 5 and the plate member 5 is also reduced.

Further, in the present invention, as described above,
In addition to forming the small-diameter portions 1a and 2a at both ends of the work rolls 1 and 2, the upper and lower work rolls 1 and 2 are made to cross each other. However, it is possible to improve the shortage of the crown control ability for the narrow plate material 5 which is a drawback of the conventional roll cloth method, and to greatly expand the crown control ability for the narrow width material.

Next, FIG. 3 shows another embodiment of the present invention. In the same configuration as shown in FIG. 1, tapered small-diameter portions 1a and 2a are used instead of tapered small-diameter portions 1a and 2a. The smooth curved small-diameter portions 1b and 2b are formed at both ends of the upper and lower work rolls 1 and 2 and correspond to the small-diameter portions 1b and 2b instead of the tapered large-diameter portions 3a and 4a. The upper and lower backup rolls 3 and 4
4 are formed at both ends.

In the embodiment shown in FIG. 3, the same operation and effect as those in the embodiment shown in FIG. 1 can be obtained.

It should be noted that the present invention is not limited to only the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0017]

As described above, according to the horizontal rolling mill of the present invention, the both ends of the upper and lower work rolls are provided with a small diameter portion having a gradually decreasing diameter toward both ends, and both ends of the upper and lower backup rolls. The large-diameter portion corresponding to the small-diameter portion was formed in the portion, and only the upper and lower work rolls were horizontally arranged so as to intersect. Therefore, the work roll and the backup roll were mechanically connected in the axial direction at both ends. State, thereby preventing the generation of excessive thrust force on the work roll, eliminating the necessity of increasing the size of the thrust receiving mechanism. Due to the presence of the small-diameter portions at both ends of the roll, excellent effects such as the ability to control the crown for a narrow plate material can be greatly improved are exhibited.

[Brief description of the drawings]

FIG. 1 shows an outline of an embodiment of a horizontal rolling mill according to the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 2 is a diagram showing a velocity distribution of a plate material.

FIG. 3 is a schematic diagram of another embodiment of the present invention.

FIG. 4 is a schematic view showing an example of a conventional roll cloth rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper work roll 1a, 1b Small diameter part 2 Lower work roll 2a, 2b Small diameter part 3 Upper backup roll 3a, 3b Large diameter part 4 Lower backup roll 4a, 4b Large diameter part

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21B 13/14 B21B 27/02 B21B 29/00 B21B 1/22

Claims (1)

(57) [Claims] 1. A small-diameter portion comprising upper and lower work rolls and upper and lower backup rolls for supporting the upper and lower work rolls, and having a diameter gradually reduced toward both ends at both ends of the upper and lower work rolls. And forming a large-diameter portion gradually increasing toward both ends corresponding to the small-diameter portion of the upper and lower work rolls at both ends of the upper and lower backup rolls, and A horizontal rolling mill having a configuration in which only work rolls are arranged to intersect in a horizontal plane.