JPS60210306A - Cross rolling mill - Google Patents

Abstract

PURPOSE:To prevent the uneven wear of roll by installing a moving device for moving a work roll in its axial direction in a roll chock to make the work roll movable in its axial direction. CONSTITUTION:A rolling material 1 is rolled by upper and lower work rolls 2a, 2b which are crossing each other at a prescribed cross angle and upper and lower backup rolls 3a, 3b which are in contact with the outsides of rolls 2a, 2b respectively. Both ends of said rolls 2a, 2b are freely rotatably supported by a pair of roll chocks 4a, 4b and are mounted so as to be vertically movably in a housing 6. Further, the roll 2b is supported freely movably in its axial direction by the chock 4b, and a moving device for moving the roll 2b in its axial direction is also housed in the chock 4b. Thus, the uneven wear of roll is prevented by this device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross-roll rolling mill, in which uneven wear of the rolls is prevented by moving the rolls in the axial direction.

The widthwise thickness of a plate rolled by a conventional rolling mill is thicker at the center due to the deflection of the rolls.

To prevent this, a cross-roll rolling mill has been developed in which rolling is performed by making the axes of the upper roll group and the axes of the lower roll group cross each other at a predetermined angle in a horizontal plane. For example, JP-A-55-6490
Publication No. 8).

However, when rolling a rolled material with a cross-roll rolling mill, especially when performing so-called four-tread rolling, which involves rolling a large amount of rolled material with a constant width, local wear may occur on the surface of the work roll that is in direct contact with the rolled material. (uneven wear) occurs. For this reason, there are problems such as it is often necessary to rearrange the rolls in order to grind the roll surface, or it is necessary to regulate the rolling order by sequentially changing the rolling order on the rolling side from wide to narrow. This was a hindrance to improving production efficiency. On the other hand, in order to solve this problem of uneven wear,
A method of shifting the position of the rolled material in contact with the work roll by moving the work roll in the axial direction was disclosed in a patent application filed in 1983.
It is proposed in No. 318.

By the way, although the purpose of the movement is different, there is a device disclosed in Japanese Patent Publication No. 18162/1983 as a device for moving the rolls of a rolling mill in the axial direction. Two cylinders are installed in each roll chock that supports the roll at symmetrical positions with respect to the roll axis, and one end of the piston installed in each cylinder projects from the end face of the roll chock and is attached to a bracket attached to the housing. When the cylinders are in contact with each other, the pistons press the brackets of the How Song and move the roll chocks and rolls in their axial directions. However, although the moving device having this structure can be applied to a normal rolling mill in which the axes of the upper and lower rolls are arranged in parallel, it is difficult to apply it to the above-mentioned cross-roll type rolling mill.

That is, in a cross-roll rolling mill.

The roll chock is supported so as to be tiltable relative to the housing so that the roll can be tilted within a horizontal plane at a predetermined angle, and a jack attached to the housing is engaged with the roll chock as a driving means for tilting the roll chock.

Further, during cross-roll rolling, a large thrust force acts in the roll axis direction, so a thrust receiving mechanism is generally provided on the end face of the roll chock to cope with the thrust force. Therefore, in order to move the roll in the axial direction, the roll chock is moved relative to the howong,
Moreover, when the above-mentioned conventional moving device, in which the piston protrudes from the end face of the roll chock and contacts the housing, is applied to a cross-roll rolling mill, the structure becomes extremely complicated, making it virtually impossible to use. .

The present invention has been made in view of the above points, and an object of the present invention is to provide a cross-roll type rolling mill equipped with a roll axial movement device whose structure is simplified.

The configuration of the cross-roll rolling mill according to the present invention that achieves this object is that the cross-roll rolling mill has an upper roll group and a lower roll group that cross at a predetermined cross angle, and both ends of the work rolls are At least one of a pair of roll chocks rotatably supports the work roll in an axially movable manner, and a moving device for moving the work roll in the axial direction is housed in the roll chock. shall be.

An embodiment of the present invention will be described below in detail with reference to the drawings. Figures 1 and 2 are a schematic front view of a cross-roll rolling mill according to an embodiment of the present invention, and A in Figure 1, respectively. -A
FIG. still.

In FIG. 2, the members on the drive side are shown with (') attached to the reference numerals.

As shown in the figure, this rolling mill has upper and lower work rolls 2a that directly pinch and roll the rolling material 1 from above and below.

2b, and upper and lower backup rolls 3a and 3b circumscribing the work rolls 2a and 2b.

Each of these rolls is a roll chock 4a.

Both ends are rotatably supported by 4b, 5a, and 5b, and installed in the window portion of the housing 6 so as to be movable up and down. On the other hand, the upper end of the upper backup roll chock 5a is connected to a rolling device fli7 and is provided with a rolling blade, and the lower backup roll chock 5b is connected to a lifting device 8 and is provided with a pressing blade. .

In addition, the housing 6 includes a jack 9a for the roll crawler,
9b, 10a, and 10b are installed, and each of them serves as a roll chock 4a.

4b, 5a, 5b are engaged with both side surfaces (front and rear surfaces in the rolling direction 20), and are sown 9a, 9b.

By operating the roll chocks 10a, 10b' back and forth, the roll chocks 4a, 4b, 5a, 5b't: are tilted to cross the upper roll groups 2a, 3a and the lower roll groups 2b, 3b to each other at an arbitrary cross angle θ in a horizontal plane. It is now possible to do so.

Furthermore, each roll chock 4a on the work side W.

4b, 5a, and 5b are thrust receiving mechanisms 11a.

11b, 12a, 12b are provided, and roll chocks 4a, 4b,
5a and 5b are restrained from moving in the axial direction within the housing song 6.

This two-last receiving mechanism will be explained below. Since the thrust receiving mechanisms 11a and lik for work roll chocks and the thrust receiving mechanisms 12a and 12b for backup roll chocks have similar configurations, the thrust receiving mechanism for work roll chocks 1 and 11b will be explained. A pair of upper and lower protrusions are formed on the end face of the roll chock 4b on the left and right sides, sandwiching the end of the attachment shaft 13 of the work roll 2b protruding from the center thereof, and levers 14 are symmetrically attached to the left and right protrusions by means of pins. The left and right levers 14 are pivotally connected to each other by a pair of connecting plates 15 located above and below, sandwiching the ends of the work roll mounting shaft 13, to form a four-bar link mechanism. On the other hand, wheels 16 each having a built-in self-aligning bearing are connected to the ends of the levers 14, and these wheels are rotatably housed in guide grooves of guides 17 provided in the housing 6 vertically parallel to each other. has been done. Therefore, even if the roll chock 4b is tilted in the horizontal plane, the thrust force acting on the roll chock 4b is transmitted to the wheel 1 through the lever 14 and the connecting plate 15 because the wheel 16 does not move horizontally in the guide groove of the guide 17.
6 and the guide groove at right angles to the contact surface and uniformly.

Note that the guide 17 is a cylinder 18 fixed to the housing 6.
When the rolls are changed, the guide 17 is guided by the guide part 19 protruding from the roll length 6 so that it can slide in the rolling direction. The roll assembly gold housing 6 can be easily removed by retracting the guide 17 and the wheels 16 from each other.
It is now possible to take it out.

Next, the axial movement device for the work rolls 2a and 2b will be described. Since the upper work roll 2a and the lower work roll 2b each have the same configuration, the lower work roll 2b will be explained below with reference to FIG.

Roll chock 4 with thrust receiving mechanism 11b attached
In the work roll 2b, the mounting shaft 13 of the work roll 2b is rotatably supported via a radial bearing 20, and is supported movably in the axial direction. A collar 21 is provided protruding from the outer periphery of the mounting shaft 13, and ring cylinders 22a are arranged concentrically with the mounting shaft 13 on both sides in the axial direction, sandwiching the collar 21 within the roll chock 4b.

22b is formed. Ring cylinders 22a on both sides,
Ring pistons 23a and 23b are attached to the ring pistons 22b, respectively, and the tips of the ring pistons 23a and 23b are attached to thrust bearings 24a, respectively, on the collar 21 of the mounting shaft 13.
, 24b. Further, the ring cylinders 22a and 22b are connected to a working fluid supply and discharge pipe (not shown) at the end opposite to the collar 21, and connected to a known fluid pressure supply source. In FIG. 2, 25 is a seal ring, 26 is a retainer, and 0 is a cross angle.

In such a configuration, one of the ring cylinders, in the illustrated state, the ring cylinder 2 on the working side W
When hydraulic pressure is applied to the ring cylinder 2a and the hydraulic pressure of the ring cylinder 22b on the opposite side, that is, the drive side, is released, the thrust bearing 2
4 & + 24 bs The lower work roll 2b moves toward the drive side along its axial direction together with the roll chock 4b' on the drive side via the collar 21.

On the other hand, if hydraulic pressure is applied in the opposite manner to the above, the work roll 2b
can be moved to the work side W.

The same applies to the upper work roll 2a, and the upper work roll 2a is also moved in the same direction or in the opposite direction as the lower work roll 2b, as appropriate. In the above structure,
Cylinder 22a stored in roll chock 4 b'
, 22b and the pistons 23a, 23b are ring-shaped concentrically with the work row horn 2b, so the pressure receiving area of the piston can be increased, and the device can be made smaller and smaller.
Simplification is possible.

Note that the present invention is not limited to the above-mentioned embodiments.
For example, the work roll 2b may be supported for axial movement in the drive-side roll chock 4b', or an axial movement device for the work roll 2b may be housed therein without departing from the spirit of the present invention. Various modifications are possible within this range.

As described above in detail with reference to one embodiment, according to the present invention, the work roll can be freely moved in the axial direction on at least one of the pair of roll chocks that rotatably support both ends of the work roll. Since the work roll is supported and the axial movement device for the work roll is housed in the roll chock, the work roll can be moved in the axial direction in a cross-roll rolling mill with a simple structure, thereby reducing uneven wear of the work roll. The occurrence of this can be completely prevented.

[Brief explanation of the drawing]

The drawings relate to one embodiment of the present invention, and FIG. 1 is a schematic front view of a cross-roll rolling mill, and FIG. 2 is a sectional view taken along line AA in FIG. 1. In the drawings, 1 is a rolled material, 2a and 2b are work rolls, 3a and 3b are backup rolls, and 4a, 4b, 5a, and 5bao-ruchok. 6 is the Housosig, 13 is the work roll mounting shaft, and 20 is the radial bearing. 21 is a collar, 22a and 22b are ring cylinders, and 23a and 23b are ring pistons. 24a and 24b are thrust bearings. Patent applicant: Mitsubishi Heavy Industries, Ltd. Patent attorney: Shibu Mitsuishi (and 1 other person) Figure 1 Figure 2 D. θ

Claims (1)

[Claims] In a cross-roll rolling mill having an upper roll group and a lower roll group that cross at a predetermined cross angle, the work roll is held in at least one of a pair of roll chocks that rotatably support both ends of the work roll. A cross-roll type rolling mill characterized in that the work roll is supported in an axially movable manner and a moving device for moving the work roll in the axial direction is housed in the roll chock.