JPS6366603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill that can be easily changed from a large-diameter work roll to a small-diameter work roll in-line.

When rolling a rolled material, it is required to increase the amount of rolling reduction in the previous rolling pass (first stage pass) and to increase the rolling load per unit area in the second stage rolling pass (finishing pass). Therefore, it is preferable to use a large-diameter work roll in the first rolling pass and to use a small-diameter work roll in the second finishing pass.

However, if the same rolling mill, such as reverse rolling, is used to perform everything from pre-stage rolling to finish rolling, and if large and small work rolls are used differently for the pre-stage pass and the finishing pass, the work roll replacement becomes troublesome and production efficiency decreases. . For this reason, work rolls of the same diameter are used from the first stage of rolling to the final rolling.
If all passes are rolled with a large-diameter work roll, the rolling load per unit cannot be increased in the finishing pass, which increases the number of finishing passes, and if all passes are rolled with a small-diameter work roll, the number of finishing passes increases. However, there is a problem that the reduction amount cannot be obtained in the rolling pass of the previous stage, and the number of rolling passes of the previous stage increases, and the production efficiency cannot be improved no matter which method is used.

The present invention has been made to solve the above problem, and includes a rotating shaft box provided inside the shaft box of the work roll, and a rotating arm extending from the rotating shaft box in a direction perpendicular to the work roll axis. Additionally, an axle box provided at the shaft end of the small-diameter work roll is supported by the rotating arm, and a drive device is coupled to the rotating axle box so that the small-diameter work roll can be rotated to a desired position. That is.

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

1 to 4 show a first embodiment of the present invention, 1 and 2 are upper and lower back-up rolls, 3 and 4 are axle boxes of the back-up rolls, 5 is an upper work roll, and 6 7 is the lower work roll, 7 is the small diameter work roll, 8 is the shaft box of the upper work roll 5, 9
1 is an axle box of the lower work roll 6, and 10 is a rotating axle box.

A rotary arm 11 extends from the rotary shaft box 10 in a direction away from the central axis of the upper work roll 5 and is shaped so as to enter the center of the rolling mill, and its tip is bifurcated. The axle box 12 of the small-diameter work roll 7 is fitted onto the forked portion 13 so as to be slidable in a direction perpendicular to the axis of the work roll 5.
A locking fitting (not shown) is provided to prevent it from falling off.
Next, the rod tip of the cylinder 16, which is pivotally connected to the housing 15, is pivotally connected to the prong 14.

When performing preliminary rolling, the cylinder 16 is shortened and the rotary shaft box 10 is rotated to raise the small diameter work roll 7 to the state shown in Fig. 3, and when finishing rolling is performed, the cylinder 16 is extended. Then, the small-diameter work roll 7 is pushed down to the state shown in FIG. 4, so that the rolled material 17 can be rolled between the small-diameter work roll 7 and the lower work roll 6.

By doing the above, the diameter of the work roll that presses against the rolled material can be changed in-line in the same rolling mill.

In the above example, the small diameter work roll 7 is provided only for the upper work roll 5, but it goes without saying that the small diameter work roll 7 may be provided for the lower work roll 6 as well.

In the first embodiment, the rotary shaft box 10 was rotated by the cylinder 16, but various mechanisms for rotating the shaft box 10 can be considered, and a second embodiment is shown in FIG.

A gear 18 is provided at the outer end of the rotating shaft box 10, and a pinion 19 is meshed with the gear 18. The pinion 19 is pivotally attached to the tip of a shaft 20 that passes through the axle box 8.
The small-diameter work roll 7 is rotated by the drive of a motor 21 coupled to the rotary shaft box 10, which rotates the rotating shaft box 10 via a pinion 19 and a gear 18, thereby moving the small-diameter work roll 7 to a desired position.

Furthermore, the shape of the rotating shaft box is not limited to the first and second embodiments.

The shape of the rotating shaft box in the first and second embodiments is such that the rotating arm 11 and the housing of the rolling mill do not interfere with each other due to the rotation of the rotating shaft box 10.
If the shape of the housing is devised to ensure a rotating space for the rotating arm 11, the rotating shaft box 10' will have a simple rectangular shape as shown in FIG.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various changes can be made.

As described above, according to the present invention, the diameter of the work roll can be changed in-line according to the rolling conditions of pre-rolling, finish rolling, and rolling, thereby significantly improving rolling efficiency.

[Brief explanation of drawings]

1 to 4 are schematic illustrations of a first embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a perspective view, FIGS. 3 and 4 are operational views, and FIG. The figure is a schematic front view of the second embodiment of the present invention, and FIG. 6 is a schematic front view of the third embodiment. 5 is the upper work roll, 6 is the lower work roll,
8 and 9 are axle boxes, 10 is a rotating axle box, 11 is a rotating arm,
12 is an axle box, 16 is a cylinder, and 21 is a motor.

Claims (1)

[Claims] 1 A rotating shaft box is provided inside the shaft box of the work roll, and a rotating arm extends from the rotating shaft box in a direction perpendicular to the work roll axis, and the rotating arm is provided with a shaft box provided at the shaft end of the small diameter work roll. is supported on the rotary arm, and a drive device is coupled to the rotary shaft box so that the small diameter work roll can be rotated to a desired position.