JPS6313841Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rolling mill in which an intermediate roll is interposed between a work roll and a back-up roll.

In this type of rolling mill, an intermediate roll is placed between a work roll and a back-up roll with its center shifted, and a pushing device pushes this intermediate roll between the work roll and the back-up roll. There are some that are made to press into contact with each other. Then, by the action of the pushing device, the magnitude of the force pressing the intermediate roll is changed, and the intermediate roll is pushed between the work roll and the back-up roll while being bent horizontally and in the axial direction. , the shape and crown of the rolled material are controlled by applying deformation of the work roll in the axial direction of the work roll commensurate with the deformation of the work roll due to the rolling force during rolling. Note that this effect is increased by using it in combination with work roll bending.

However, since such intermediate rolls have conventionally been solid, there is a limit to their elastic deflection in the horizontal direction, and they have not been able to exert sufficient effects on shape control and crown control. Moreover, in order to efficiently generate this effect, it is better to make the diameter of the intermediate roll small, but conversely, if the diameter is made small, the contact area between the work roll and the back-up roll becomes smaller.
There was a problem that the contact surface pressure increased, and there was a limit to reducing the diameter due to the surface pressure strength.

This idea was made in view of the above circumstances,
By using an intermediate roll having a hollow part, the amount of elastic deflection in the horizontal direction along the axial direction can be partially increased, thereby effectively controlling the shape and crown of the rolled material. By increasing the concave deformation of the roll, the contact area between the work roll and the back-up roll can be increased and the contact surface pressure can be reduced, eliminating the restriction of diameter reduction and achieving more efficient shape control and crown control. The purpose is to provide a rolling mill that can be realized.

This invention will be explained below based on the drawings.

FIGS. 1 and 2 show an embodiment of this invention, in which reference numeral 1 denotes a pair of work rolls located above and below a rolled material. Backup rolls 2 are arranged above and below this work roll 1.
Furthermore, an intermediate roll 3 is interposed between the upper work roll 1 and the backup roll 2.

The feature of this invention is that this intermediate roll 3 has a hollow section 4.
The hollow portion 4 is formed between the rotating shaft 5 and the outer circumferential portion 6, and the outer circumferential portion 6 is fixed to the rotating shaft 5 at the center.

The intermediate roll 3 is arranged such that its rotation center O is off the line connecting the rotation centers P and Q of the work roll 1 and the backup roll 2. That is, the intermediate roll 3 is disposed so as to be interposed laterally between the work roll 1 and the back-up roll 2, and is brought into pressure contact with the work roll 1 and the back-up roll 2 by the pushing device 7. This applies the horizontal component of the rolling force generated from the rolled material to the intermediate roll 3, adjusts the magnitude of the resultant force with the horizontal force from the pushing device 7 in the axial direction of the intermediate roll 3, and This is because it is possible to effectively control the shape and crown by adjusting the horizontal deflection distribution of the work roll 1 and the deflection distribution in the thickness direction of the rolled material of the work roll 1.

This pushing device 7 includes a roll 8 that rolls into contact with the intermediate roll 3, and a hydraulic cylinder 9 that pushes it out.
The intermediate roll 3 is pushed between the work roll 1 and the back-up roll 2 by operating as shown by arrow A. In addition, in this embodiment, two pushing devices 7 are arranged in the axial direction of the intermediate roll 3, and a moving cylinder 10 is attached to the pushing device 7, and the pushing device 7 is arranged in the direction of the axial length of the intermediate roll 3.
It is configured so that it can move in the axial direction of the intermediate roll 3 as shown in FIG.

However, in a rolling mill configured in this way,
As in the conventional case, the intermediate roll 3 is brought into pressure contact with the work roll 1 and the back-up roll 2 while being bent in the horizontal direction by the pushing device 7, whereby the horizontal component of the rolling force is matched. The pressing force is adjusted to control the shape and crown of the rolled material, but since the intermediate roll 3 is provided with a hollow part 4, it has a lower width in the horizontal direction than a solid roll of the same diameter. The amount of elastic deflection can be significantly increased, and the control range can be widened to make the control more effective. Further, in this case, the intermediate roll 3 having the hollow portion 4 is deformed so that the free side surface portion bulges outward when subjected to rolling load, but the swollen portion is pushed inward by the pushing device 7. Alternatively, the amount of vertical deformation of the intermediate roll 3 can be adjusted by pressing the portion that is about to expand with the pushing device 7. Therefore, by changing the amount of deformation in the axial direction, crown control or shape control can be effectively performed. That is, shape control or crown control is effectively performed by two elements: horizontal deflection and vertical deformation (deformation of cross section) of the intermediate roll 3. Further, since the concave deformation of the cross section of the intermediate roll 3 increases, the pressure contact area (contact area) can be relatively large even if the diameter is small, and the contact surface pressure can be reduced. Therefore, it is possible to realize a smaller diameter, which is limited by the surface pressure strength.
The above control can be performed more efficiently.

In the above embodiment, the intermediate roll 3 is arranged between the upper work roll 1 and the backup roll 2, and furthermore, on the upstream side in the flow direction of the rolled material, but the present invention is not limited to this. do not have.

Further, the hollow part 4 of the intermediate roll 3 is not limited to the above embodiment, but may be formed by fixing the rotating shaft 5 and the outer peripheral part 6 at both ends as shown in FIG. 3, or may be formed into a hollow shape. You can also do it.

Further, the pushing device 7 is not limited to the roll type of the above embodiment, but may be any device that presses the intermediate roll 3. It may also be provided with one or more devices, or with a fixed bar as shown in FIG. It may be attached to 11.

Alternatively, as shown in FIG. 4, the work roll 1, intermediate roll 3, and back-up roll 2 may be arranged linearly, and the pushing device may not be provided.

Furthermore, in the above configuration, in order to effectively perform shape control and crown control, it is of course possible to use work roll bending in combination. 11,1 in the figure
1' is a work roll bending device for doing this, and 12 is a work roll chock.

As explained above, in the rolling mill of this invention, an intermediate roll having a cavity is interposed between the work roll and the back-up roll, and the intermediate roll is pushed between the work roll and the back-up roll by a pushing device. Therefore, the intermediate roll can be sufficiently deflected, a small diameter intermediate roll can be used, and the shape and crown of the rolled material can be effectively controlled.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing one embodiment of this invention, FIG. 2 is a partial sectional view showing the main parts of the same embodiment, and FIG. 3 is a partial sectional view showing another embodiment of the same main parts. FIG. 4 is a schematic side view showing still another embodiment. 1... Work roll, 2... Backup roll, 3... Intermediate roll, 4... Hollow portion, 7... Pushing device.

Claims (1)

[Scope of utility model registration request] a pair of upper and lower work rolls; a pair of upper and lower back-up rolls disposed above and below the work rolls; and a rotation center interposed between at least one of the work rolls and the back-up rolls, the center of rotation of which is located between the work rolls and the back-up rolls. and a rolling mill comprising: an intermediate roll arranged offset from a line connecting rotation centers of the back-up rolls; and a pushing device for pushing the intermediate roll between the work roll and the back-up roll. A rolling mill characterized by having a hollow section.