JPS5956909A - Bender for work roll in multi-stage rolling mill - Google Patents

Abstract

PURPOSE:To enable exertion of bending force on work rolls in a multi-stages rolling mill by interposing wedges between the chocks of the upper and lower work rolls and moving forward and backward the wedges by means of cylinders. CONSTITUTION:The wedges 11a, 11b interposed between chocks 5a and 5b of upper and lower work rolls 2a, 2b ar moved forward or backward respectively by the extending operation of hydraulic cylinders 10a, 10b and are inserted into the space between the chocks 5a, 5b to open the upper and lower chocks 5a, 5b in a vertical direction. The rolls 2a, 2b are thus forcibly bent to generate bending force. The rate of correcting the shape of a rolling material is set by the bending force for forcing and opening the rolls 2a, 2b to be generated when the wedges 11a, 11b are inserted between the chocks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work roll bending device in a multi-high rolling mill.

As a method for modifying the shape of a rolled material in a multi-high rolling mill, a work roll bending method, a crown control method, etc. are often used.

However, conventional work roll bending devices cannot be installed in multi-high rolling mills due to space constraints. Further, the crown control device cannot fully demonstrate its function in a rolling mill with a low rolling reduction ratio.

The present invention was made in view of the above circumstances, and is designed to provide bending to the work roll by interposing a wedge between the chocks of the upper and lower work rolls and moving this wedge forward and backward with a cylinder. It is an object of the present invention to provide a work roll bending device for a multi-high rolling mill, which can be applied to a rolling mill where crown control cannot be performed in terms of speed, or a multi-high rolling mill without space constraints.

Next, the present invention will be explained according to the drawings which are one embodiment.

In the drawing, the bending device according to the present invention is applied to a work roll. The work rolls and first intermediate rolls of a multi-high rolling mill are shown, with upper and lower work rolls 2a, 2b placed above and below the pass line 1, and first intermediate rolls 3a, 3b, 3C, 3cl placed outside thereof. Consisting of The drive and work side roll neck portions 4a at both ends of the upper and lower work rolls 2a, 2+) are respectively chocks 5a and 5b.
It is therefore supported in the roll stand 9.

FIG. 1 shows the chock S a 5FfJS on the drive side (work side) of the partial work roll 2a, but the lower work roll 2! ] The chock 5b also has the same structure.

In the illustration, a thrust bearing needle roller bearing 6a is inserted into the chock 5at of the upper work roll 2a.
The bearing (thereby rotatably supports the roll neck portion 4a; 7a is a spacer).

The needle roller bearing 6a is particularly designed without an inner ring, thereby reducing the size of the chock 5a and increasing the size of the first
It is made so as not to interfere with the intermediate rolls 3a and 3b. The thrust loads of these upper and lower roll chocks 5a and 5b are received by the roll cover 8. A work roll bending device shown in FIG. 2 is installed on each drive side of the upper and lower work rolls 2a and 2b and on the work side yokes 5a and 5b.

Roll chocks 5a, 5 from the inner wall surface of the roll stand 9
BL A pair of hydraulic cylinders 10a and 10b are protruded parallel to the pass line 1 so as to face each other, and wedges lla and llb having wedge-shaped tips are attached to the ronds of both cylinders. A liner 12 is fixed to the upper and lower surfaces of the tip of each wedge with mounting fittings.

Both wedges lla and llb are connected to hydraulic cylinder 1, respectively.
By the extension operation of 0a and 10b, the tip wedge portion 1
1a, jlb move forward and upper and lower roll chocks 5a, 5b
It is inserted into the gap and forcibly bends the upper and lower wax bars 2a, 2b to generate a pending force. The amount of shape modification of the rolled material is determined by the wedge I.
It is set by the amount of push-opening of the work roll by inserting la and llb.

Since the present invention is configured as described above, even when the crown control method cannot be implemented at a low rolling reduction rate, the work roll 1
The shape side S1 of the rolled material can be performed by applying this bending force.

Moreover, since this venting device has upper and lower work rolls, there is no need for a thrust block.When threading, this wedge pushes up the upper work roll and closes the roll gap. Since it can be held in the open position, the operator does not have to do complicated work such as pulling out the upper work roll.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view of a work roll chock portion according to the present invention, and Fig. 2 is a cross-sectional view taken along arrows - -■ in Fig. 1.
Parts 2a, 2b=-Upper and lower work rolls, 3a, 3b, 3△c, 3d... 1st middle 1-bi roll, 5a, 5b... Upper and lower work roll chocks, 6a... Needle roller bearing, 8.
...Roll cover, 10a, 10b...Hydraulic cylinder,
11a, llb...wedge, 12...liner.

Claims (1)

[Claims] (1) A pair of cylinders are arranged facing each other on both sides of the chocks of the upper and lower work rolls and at positions parallel to the pass line, and a wedge provided at the end of each cylinder rod of the pair is placed between the upper and lower roll chocks. A bending device for work rolls in a multi-high rolling mill, characterized in that