JPS6336844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll cross rolling mill equipped with a top roll balancing device.

In rolling mills, in order to reduce the cumulative clearance between the rolls due to the weight of the rolling mill components and further improve the positioning accuracy of the rolls, a top roll balance device is used that lifts the rolls vertically upwards with a force greater than the weight of the component parts. is provided.

A conventional top-roll balance device is shown in FIG. A roll balance cylinder 1 is fixed to a top separator 2 at the top of the rolling mill, and a pedestal 4 is placed on a rod 3 of the roll balance cylinder 1. At the tip of this rod 3 is a spherical seat 3'.
is attached, and the flat portion of the pedestal 4 comes into contact with this spherical seat 3', so that the pedestal 4 can be balanced. An assembly of a roll 7 and a chock 8 is suspended from this pedestal 4 via a hanger bar 5 and a hanger beam 6. By moving this rod 3 up and down, the roll 7 can be moved up and down.

In a rolling mill equipped with such a top roll balance device, when rolling is performed by the roll cross rolling method that controls the thickness of the strip in the width direction, the central part O of the roll 7 is adjusted as shown in FIG. The roll 7 and chock 8 are rotated by a minute angle in a horizontal plane with the rotation center at . In this case, the chock 8 is hanging from the hanger beam 6 as shown in Figure 1, so
When the roll 7 and the chock 8 are rotated, a relative slip occurs at the contact surface A between the hanger beam 6 and the chock 8. Since the weight of the roll 7 and chock 8 is directly applied to this contact surface A, frictional resistance is large, and not only does it lack quick response, but the contact surface A is also damaged by wear and tear, and the four contact surfaces A are not in the same horizontal plane. If it becomes worn out, it will take a considerable amount of time and man-hours to repair it.

Therefore, an object of the present invention is to eliminate such drawbacks and provide a roll cross rolling mill equipped with a top roll balance device that does not cause slippage at the contact surface between the hanger beam and the chock when rotating the rolls and chock. . The structure of the present invention to achieve such an object is such that a plurality of hanger bars surrounding the roll balance cylinder are rotatably supported in a horizontal plane on rods protruding from the upper part of the roll balance cylinder, and rolls are attached to the hanger bars. support,
The hanger bar is characterized in that a liner is provided on the outer periphery of the roll balance cylinder, and a rotation guide is provided on the hanger bar so as to be engaged with the liner and restrained from vertical movement, and also to be slidable and rotatable.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In addition, since the present invention is a partial improvement of the conventional roll cross rolling mill, the same parts are given the same reference numerals, and only the different parts will be explained.

The present invention has a structure in which the pedestal is simply supported by a spherical seat at the tip of the rod, and the pedestal can be rotated in a horizontal plane. It is designed to be able to rotate as a unit.

As shown in FIG. 2, a donut-shaped clamp 12 is attached to the outer periphery of the roll balance cylinder 1. A groove is provided on the outer periphery of the clamp 12, and an annular liner 11 having an L-shaped cross section is fixed via two upper and lower annular bottom plates each having an L-shaped cross section. On the other hand, the rotation guide 10 is attached to the hanger bar 8.
can be installed. A bush 13 is fitted into the rotary guide 10 and is rotatable and slidable in the longitudinal direction of the hanger bar 5. A guide frame 9 is attached around the roll balance cylinder 1 to prevent the rotation guide 10 from moving upward along the hanger bar 5, and together with the liner 11, restrains the rotation guide 10 from moving in the vertical direction. The above parts can also be attached to the upper part of the roll balance cylinder 1, but in this case also the clamp 1
2 and the guide frame 9 are fixed to the roll balance cylinder 1.

The operation of such a roll cross rolling mill will be explained. When the rod 3 is moved up and down, the rotation guide 10 itself is restrained from vertical movement by the guide frame 9 and liner 11, so the hanger bar 5 slides within the bush 13 of the rotation guide 10 and moves up and down. The assembly of roll 7 and chock 8 also moves up and down. Furthermore, when a horizontal rotational force is applied to the pedestal 4, the rotation guide 10 moves along with the hanger bar 8 to the liner 1.
The hanger bar 5 moves using the outer periphery of the hanger bar 5 as a guide surface.
The roll 7 and chock 8 attached to the roll balance cylinder 1 rotate in a horizontal plane centered directly below the roll balance cylinder 1. At this time, since no relative force is applied between the hanger beam 6 and the chock 8, there is no slippage between these contact surfaces. It doesn't wear out either.

In addition, in this example, there was no need to make the hanger bar freely rotatable because it was a cross-roll rolling mill with a roll balance device that had a pedestal placed on the rod via a spherical seat. A rolling mill that cannot be moved must be equipped with a mechanism that allows it to rotate freely.

As described above with reference to the embodiments and drawings, according to the present invention, the chock itself is structured to rotate, so there is no relative slippage due to roll rotation at the contact surface between the chock and the hanger beam.
Therefore, no wear damage occurs on the contact surfaces. The force required for roll rotation is reduced by the amount of frictional resistance generated between the chock and hanger beam compared to the case where the rolls slide between them. Replacement is easy and these parts are inexpensive. In addition, since it is provided with a rotation guide on which the roll balance force does not directly act, it does not affect the followability of the functions of the top roll balance device.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional roll cross rolling mill.
FIG. 2 is an explanatory diagram of a roll cross rolling mill according to the present invention, and FIG. 3 is an explanatory diagram showing the rotation center position of the rolls. In the drawings, 1 is a roll balance cylinder, 3 is a rod, 5 is a hanger bar, 7 is a roll, 10 is a rotation guide, and 11 is a liner.

Claims (1)

[Claims] 1 A plurality of hanger bars that surround the roll balance cylinder are rotatably supported in a horizontal plane on rods protruding from the upper part of the roll balance cylinder, and rolls are supported on the hanger bars, A roll cross rolling mill characterized in that the hanger bar is provided with a liner, and a rotation guide is provided on the hanger bar so as to be engaged with the liner and restrained from vertical movement, and also to be slidable and rotatable.