JP2750210B2 - Multi-high rolling mill - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-high rolling mill provided with a work roll bending mechanism.

(Prior Art) A multi-high rolling mill such as a 6-high, 12-high or 20-high type rolling mill is used for rolling a thin rolled material. In this type of multi-high rolling mill, there is a work roll bending mechanism as one of the functions of correcting the shape of a material to be rolled.

This work roll bending mechanism is disclosed in
No. 6011, JP-A-58-50108, JP-A-58-50111
As disclosed in JP-A-58-53311 and JP-B-58-53311, both ends of a drive side and a work side of a pair of upper and lower work rolls arranged vertically with a rolled material interposed therebetween are supported by upper and lower work roll chocks. At the same time, between the upper and lower work roll chocks on the drive side and the work side, cylinder mechanisms incorporated on the lower work roll chock side are provided on the entrance side and the exit side of the material to be rolled, respectively. During the rolling of the material to be rolled, the interval between both end portions of the pair of upper and lower work rolls is expanded by a cylinder mechanism to adjust the shape of the material to be rolled.

On the other hand, when replacing a pair of upper and lower work rolls,
Raise the upper housing that supports the roll group such as the upper intermediate roll and support roll, remove the roll load, place a spacer between the upper and lower work roll chocks at both ends, and leave the pair of upper and lower work rolls stacked The method of drawing out to the working side is adopted. Therefore, when there is a material to be rolled between the work rolls, the work roll cannot be replaced.

(Problems to be Solved by the Invention) Conventionally, large-sized work roll chocks incorporating a cylinder mechanism for work roll bending are provided at both ends of the drive side and the work side, respectively. However, a multi-high rolling mill in which work rolls are frequently changed is not practical in operation. In particular, in sheet rolling in which strict quality is required for the surface properties (scratch, gloss, shape), the work rolls have a small diameter and the frequency of replacement is large, and also between rolling passes (the material to be rolled exists between the upper and lower work rolls). It is necessary to change the work roll in step (1), but such a change is practically impossible. Therefore, quality is sacrificed. Further, conventionally, since the cylinder mechanism is provided on both the entrance side and the exit side at both ends on the driving side and the working side, the number of cylinder mechanisms, hoses, etc. increases, and maintenance and work are difficult.

In view of the above, the present invention provides a multi-high rolling mill capable of simplifying the work roll exchange work, simplifying and miniaturizing the structure of the cylinder mechanism, further reducing manufacturing costs, and facilitating maintenance work. The purpose is to provide.

(Means for Solving the Problems) The present invention provides, as a first means for achieving this, a material to be rolled 3
A pair of upper and lower work rolls 1 and 2 arranged one above the other
The upper and lower work rolls chocks 4, 5 provided at both ends of the upper and lower work rolls 1, 2
In a multi-high rolling mill provided with a work roll bending mechanism for expanding the shape of the material to be rolled 3 while being expanded during rolling by a cylinder mechanism 11 provided on the upper and lower work rolls 1, 2, The upper and lower work roll chocks 4 and 5 are projecting portions 9 and
A cylinder mechanism 11 is provided between the projecting portions 9 and 10 of the pair of upper and lower work roll chocks 4 and 5 for expanding the interval between the projecting portions 9 and 10 of the pair. Things.

Further, according to the present invention, as a second means, in addition to the first means, a cylinder mechanism 11 for expanding the interval between the protruding portions 9 and 10 is provided in the operating direction of the cylinder mechanism 11 and the longitudinal direction of the work rolls 1 and 2. It is provided so as to be rotatable about a shaft 18 in a direction orthogonal to any of the directions.

Further, according to the present invention, as a third means, in addition to the first means, two pairs of upper and lower work roll chocks 4, 5 provided at both ends of the upper and lower work rolls 1, 2 are provided. The cross-sectional area is smaller than the cross-sectional area in the radial direction of, and a cylindrical shape concentric with the work rolls 1 and 2, and the protruding portions 9 and 10 are formed by cutting the cylinder. is there.

According to the present invention, as a fourth means, in addition to the third means, the upper work roll chock 4 has a balancer 19 which balances the upper work roll chock 4 with its protruding portion 9 facing upward.

(Operation) During rolling, the cylinder mechanism is operated to increase the distance between the upper and lower protruding parts, and to provide a bending action to the upper and lower work rolls 1 and 2. Cylinder mechanism 11 is upper and lower work roll chock
Since it is between the protruding portions 9 and 10 protruding from 4 and 5, the moment arm becomes large and one cylinder mechanism 11 can bend sufficiently, so that the structure is simple and compact.

Since the cylinder mechanism 11 is rotatable around the axis 18, no excessive force acts on the cylinder mechanism 11 during rolling, and the size of the cylinder mechanism 11 can be reduced.

When replacing the upper and lower work rolls 1 and 2,
The upper and lower work rolls 1 and 2 are attached and detached in the longitudinal direction without overlapping. Therefore, the replacement operation can be easily performed in a short time. At this time, since the cross-sectional area of the upper and lower work roll chocks 4, 5 is smaller than that of the work rolls 1, 2, and the upper and lower work roll chocks 4, 5 are cylindrical, the work roll chocks 4, 5 rotate during replacement work. However, the material to be rolled 3 is not damaged. Since the upper work roll chock 4 has a balancer 19, the work roll chock 4,
5 can be prevented from rotating, and the cylinder mechanism 11 can be easily mounted and dismounted.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 1, 1 is an upper work roll, 2 is a lower work roll, and these upper and lower work rolls 1 and 2 It is arranged vertically above and below. A pair of upper and lower work rolls 1,
2 is rotatably supported by two pairs of upper and lower work roll chocks 4 and 5 provided at both ends on the driving side and the working side. Two pairs of upper and lower work roll chocks 4 and 5
As shown in FIG. 5 to FIG. 5, the upper and lower work rolls 1 and 2 are formed in a bottomed cylindrical shape having a smaller cross-sectional area than the radial cross-sectional area and concentric with the upper and lower work rolls 1 and 2. The upper and lower work roll chocks 4 and 5 are rotatably inserted through needle bearings 6, thrust bearings 7, ball bearings 8, and the like. Projections 9, 10 extending in the longitudinal direction of the upper and lower work rolls 1, 2 are provided at the outer ends of the two pairs of upper and lower work rolls 4, 5 by cutting out a part thereof. Reference numeral 11 denotes a cylinder mechanism for expanding the interval between the pair of upper and lower projecting portions 9 and 10, between the pair of upper and lower projecting portions 9 and 10 formed on the two pairs of upper and lower work roll chocks 4 and 5 on the driving side and the working side. The work rolls 1 and 2 are provided so as to be detachable in the longitudinal direction. As shown in FIG. 2, FIG. 3, FIG. 4, and FIG.
2, a piston 13, a piston rod 14, and a spring 14B.
15 is provided, and a hydraulic hose 16 for supplying pressure oil to a cylinder chamber therein is connected. The upper end of the piston rod 14 is formed as a spherical surface 14A, and the spherical surface 14A contacts the upper protrusion 9. Meanwhile, for the moment 15
Is also formed as a spherical surface 15A, and the lower protrusion 10
Is in contact with

The cylinder body 12 is fitted on the U-shaped portion of the thrust block 17 and has an axis 18 that is perpendicular to both the operating direction (vertical direction) of the cylinder mechanism 11 and the longitudinal direction of the work rolls 1 and 2. And are rotatably supported.
Each thrust block 17 is attached to a roll cover (not shown) on the driving side and the working side. As shown in FIGS. 2 and 5, the upper work roll chock 4 is provided with a balancer 19 that balances with the protruding portion 9 facing upward. The balancer 19 is formed by pouring lead from an inlet 20 into a cavity formed in the upper work roll chock 4.

In the present embodiment, the balancer 19 is formed by pouring lead. However, lead may be screwed, or conversely,
The upper work roll chock 4 may be formed by providing a light-weight portion such as a cavity.

In the present embodiment, the cylinder mechanism 11 is
Although it is a single-acting cylinder having B, it goes without saying that it may be a double-acting cylinder.

In the above configuration, during rolling of the material 3 to be rolled, pressurized oil is supplied to the cylinder chamber of each cylinder mechanism 11, and the operation of the cylinder mechanism 11 expands the interval between the upper and lower protruding portions 9 and 10 up and down. A bending action is applied to the upper and lower work rolls 1 and 2 to shape the material 3 to be rolled. In this case, since the cylinder mechanism 11 is located between the projecting portions 9 and 10 of the upper and lower work roll chocks 4 and 5 and is separated from the internal bearings 6, 7 and 8, the moment arm becomes large and one small Sufficient bending action can be obtained only by providing the cylinder mechanism 11, so that the structure of the cylinder mechanism 11 can be simplified and reduced in size. Further, since only one cylinder mechanism 11 is provided on each of the driving side and the working side, the structure can be simplified, so that the manufacturing cost can be reduced and maintenance such as replacement work can be simplified. Further, even when the work rolls 1 and 2 are bent during rolling, or when the thickness of the material 3 to be rolled is different at the left and right ends, and the upper work roll 1 is inclined, the cylinder mechanism 11 is not rotated.
Since it can be rotated around 18, no excessive force acts on the cylinder mechanism 11.

When exchanging the upper and lower work rolls 1 and 2, first pull the working-side thrust block 17 toward the working side in the direction indicated by the arrow a, and the cylinder mechanism 11 supported by the thrust block 17 is moved upward and downward.
Get out of ten. Of course, the pressure oil of the cylinder mechanism 11 is drained before this. At this time, since the cylinder mechanism 11 has the spring 14B, the piston rod 14 is retracted and can be removed simply by removing the pressure oil.

Next, as shown in FIG. 7, the upper and lower work rolls 4, 5 are chucked by the chuck device 22 of the pulling cart 21, and then the pulling cart 21 is moved in the direction of arrow a to move the upper and lower work rolls 1, 2. Pull out in the longitudinal direction. Then, since the cylinder mechanism 11 on the drive side is left out of the space between the protruding portions 9 and 10, the upper and lower work rolls 1,
2 can be extracted with the top and bottom stacked.
At this time, since the cross-sectional area of the upper and lower work roll chocks 4 and 5 is smaller than the cross-sectional area of the work rolls 1 and 2, the upper and lower work roll chocks 4 and 5 on the driving side interfere with the material 3 to be rolled, and Does not scratch the surface. The upper work roll chock 4 has a balancer 19, which is balanced with the protruding portion 9 facing upward, so that the position does not shift in the rotating direction, and especially when the upper and lower work rolls 1 and 2 are loaded. In addition, the operation for inserting the cylinder mechanism 11 between the protrusions 9 and 10 is easy. Therefore, the work of replacing the upper and lower work rolls 1 and 2 can be easily performed in a short time. Also hydraulic hose 16
There is no need to attach or remove the. Further, since the upper and lower work roll chocks 4 and 5 are cylindrical and have a smaller diameter than the work rolls 1 and 2, the material 3 to be rolled is changed by the upper and lower work roll chocks 4 and 5 during the replacement of the upper and lower work rolls 1 and 2. No damage.

(Effects of the Invention) According to the present invention, two pairs of upper and lower work roll chocks 4, 5 provided at both ends of each of the upper and lower work rolls 1, 2 are provided.
Have projecting portions 9 and 10 extending in the longitudinal direction of the work rolls 1 and 2, and between the projecting portions 9 and 10 of the pair of upper and lower work roll chocks 4 and 5, the projecting portions 9 and 10 forming the pair. Since the cylinder mechanism 11 that expands the interval between them is detachably provided, the work of exchanging the upper and lower work rolls 1 and 2 can be facilitated, and the cylinder mechanism 11 can be simplified and reduced in size. Maintenance work can be simplified.

Further, in the present invention, the cylinder mechanism 11 for expanding the interval between the protruding portions 9 and 10 has the axis 1 that is perpendicular to both the operating direction of the cylinder mechanism 11 and the longitudinal direction of the work rolls 1 and 2.
Since it is provided rotatably as 8, the cylinder mechanism 1
No excessive force acts on 1.

Furthermore, according to the present invention, two pairs of upper and lower work rolls chock 4, provided at both ends of the upper and lower work rolls 1, 2, respectively.
5 is a cylindrical shape whose cross-sectional area is smaller than the radial cross-sectional area of the work rolls 1 and 2 and which is concentric with the work rolls 1 and 2, and whose projections 9 and 10 cut the cylinder. Upper and lower work roll chock when replacing because it was formed by chipping
Even if 4 and 5 rotate around the axis, the rolled material 3 is not damaged.

Further, in the present invention, since the upper work roll chock 4 has the balancer 19 that balances with the protruding portion 9 thereof up, the upper work roll 1 does not rotate at the time of replacement, and the mounting and dismounting of the cylinder mechanism 11 is facilitated. Can be.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a front view, and FIG.
The figure is a partially cutaway front view of the main part, and FIG. 3 is III-III in FIG.
FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2, and FIG.
FIG. 6 is a front view of a cylinder mechanism portion, and FIG. 7 is an explanatory diagram when a work roll is replaced. 1. Upper work roll, 2. Lower work roll, 3.
Rolled material, 4 ... Upper work roll chock, 5 ... Lower work roll chock, 9, 10 ... Protrusion, 11 ... Cylinder mechanism, 18 ... Shaft, 19 ... Balancer.

Claims (4)

(57) [Claims] An interval between both ends of a pair of upper and lower work rolls (1) and (2) arranged vertically above and below a material to be rolled (3) is determined by adjusting the distance between each of the upper and lower work rolls (1) and (2). Two pairs of upper and lower work roll chocks provided at both ends (4)
In a multi-high rolling mill equipped with a work roll bending mechanism that expands during rolling by a cylinder mechanism (11) provided in (5) and adjusts the shape of the material to be rolled (3), the upper and lower work rolls (1) and (2) Two pairs of upper and lower work roll chocks (4) and (5) provided at each end,
The work rolls (1) and (2) have protrusions (9) and (10) extending in the longitudinal direction, and are provided between the protrusions (9) and (10) of the pair of upper and lower work roll chock (4) (5). A multi-high rolling mill, wherein a cylinder mechanism (11) for expanding the interval between the pair of projecting portions (9) (10) is detachably provided. 2. A cylinder mechanism (11) for increasing the distance between the projections (9) and (10) is provided in any one of the direction of operation of the cylinder mechanism (11) and the longitudinal direction of the work rolls (1) and (2). 2. The multi-high rolling mill according to claim 1, wherein the second rolling mill is rotatably provided about a direction orthogonal to the axis. 3. A pair of upper and lower work roll chocks (4) and (5) provided at both ends of each of the upper and lower work rolls (1) and (2) is provided with a radial cut of the work rolls (1) and (2). It has a cylindrical shape whose cross-sectional area is smaller than the area and is concentric with the work rolls (1) and (2), and its protruding portions (9) and (10) are formed by cutting out the cylinder. The multi-high rolling mill according to claim 1, wherein: 4. The multi-high rolling mill according to claim 3, wherein the upper work roll chock (4) has a balancer (19) that balances with the projection (9) thereof up.