JPS60238005A - Rolling mill - Google Patents

Abstract

PURPOSE:To improve a bending effect, etc. by supporting rolling rolls with fearings by means of inside journal boxes and outside journal boxes and applying horizontal bending to the outside journal boxes with the inside journal boxes as fulcrum. CONSTITUTION:Both ends of upper and lower work rolls 1, 2 are supported respectively by the inside journal boxes 3, 3', 4, 4' and the outside journal boxes 5, 5', 6, 6'. The boxes 3, 3', 4, 4' are disposed slidably in the vertical direction and in the axial direction of the work rolls in the window part 8 of a housing 7. The upper work roll 1 curves horizontally with the boxes 3, 3' as fulcrum as shown by broken lines A if the piston rods 15, 15' of bending cylinders 11, 11' are projected and the piston rods 14, 14' of cylinders 10, 10' are retracted. The lower work roll 2 can be similarly curved. The large bending effect is obtd. with a slight force and the accuracy in the control of the sheet shape is improved by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling mill that can easily apply a horizontal pending force to rolling rolls.

[Conventional technology]

Since the rolling roll is bent by the rolling load, rolling it as it is will result in a medium-high plate, and it will not be possible to obtain a plate with good plate thickness accuracy and plate shape (flatness), which are the main qualities.

Therefore, as shown in FIG. 1, a vertical pending force is applied to the work roll (a) to correct the vertical deflection of the work roll (a).

However, since there is a backup roll (b) with a large diameter outside the work roll (α), the work roll (α)
Even if an attempt is made to increase the distance between the axle boxes of the upper and lower work rolls (α) by installing a bending cylinder between the axle boxes, the vertical bending amount of the work roll (α) will be limited, and the work roll (α) The bending effect could only be obtained near the edges of the work roll (α), and the bending effect did not extend to the center of the work roll (α).

In addition, as shown in Fig. 2, an intermediate roll (c) is interposed between the work roll (α) and the backup roll in a crossed state to reduce the restraint of the work roll (a) and obtain a large amount of bending. There is an example of doing so.

However, with this, the work roll (α) and the intermediate roll (c
) rotate in an intersecting state, a large thrust force acts on the work roll (α), and the movement of the work roll (a) in the axial direction causes the plate to meander and twist. .

[Problem that the invention seeks to solve]

In view of the above-mentioned conventional situation, the present invention aims to provide a rolling mill that can obtain a large bending effect over the entire width of the rolling roll without generating thrust force.

[Failure to solve the problem]

The present invention supports the rolling rolls by bearings on an inner shaft box and an Nll shaft box, respectively, and is provided with a bending device that applies horizontal bending to the outer shaft box using the inner shaft box as a fulcrum. This applies to a rolling mill that is designed to produce a very large bending effect over the entire width of the rolling roll.

〔Example〕

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

Figures 3 and 4 show an embodiment of the present invention, in which both ends of the upper and lower work rolls (]) (2+) are connected to the inner shaft box (3) (3), respectively.
, (41 (41 and outer axle box (5) (!5'), (6
1 (+3') respectively support the heel and each inner axle box (3) (3
'), (4) (4 pieces are connected to the window part (
8), and benzoin bean cylinders (10) (16 (+ 1) (l ])
, (12) (1z (13) (13) horizontal direction needle stroke rod 04) 0 (a) (1!H] 5), (+6)
(16) (17) (+7) is each outer shaft box (5
) (F5), (6) are arranged so as to be able to come into contact with the side surfaces of (6), respectively.

In the figure, (+8) 0914 up and down back up roll, (
20) (2]) H shows the upper and lower backup roll shaft boxes.

With the above configuration, the bending cylinder (I
+) (] ])) If the piston rod (15) (extends the lower part and retracts the piston rod (14) (14) of the benzene cylinder aO) (+$), as shown by the broken line A in Fig. 4, The upper work roll (1) is bent horizontally using the inner shaft box (31 (31) as a fulcrum, and the piston rod (14) of the bending cylinder 001 (10)
affi+ and bending cylinder (11
) (16 piston rolls 1
) curves horizontally in the opposite direction.

In addition, the lower work roll (2) also has the upper work roll (1),
, l can be curved horizontally as in the case.

Here, since the horizontal bending of the upper and lower work rules (II2) is not restrained by the upper and lower backup rolls (18) 091, a large bending effect can be obtained with a small amount of pending force.

Furthermore, the left and right bending cylinders OoJ Ql) H
H piston lot resistance +40 + (g) 06) a By changing the protrusion amount of the force appropriately, the desired roll bending curve can be given to the upper and lower work rolls (]II2, and the upper and lower work rolls (1) and (2) can be individually bent. It is also possible to provide a roll bending curve of 100 mm, making it possible to control the plate shape with high precision.

Note that the rolling mill of the present invention is not limited to the above-described embodiments, and may apply horizontal pending force only to at least one of the upper and lower work rolls or the upper and lower intermediate rolls. A vertical bending cylinder is installed in addition to a horizontal bending cylinder to apply a vertical pending force to the outer shaft box, and it is also applicable to rolling mills in which the axes of either or both of the upper and lower work rolls are offset. Of course, various modifications may be made without departing from the spirit of the present invention.

〔Effect of the invention〕

As described above, the rolling mill of the present invention exhibits various excellent effects as described below.

(I) The axle box that supports the rolls is divided into an inner and outer axle box, and the outer axle box is moved horizontally using the inner axle box as a fulcrum, so a horizontal pending force can be applied to the rolls.

(II) Since horizontal bending is used, there is less restraint on the upper and lower backing rolls, etc., so a great bending effect can be obtained, and the pending force can be applied to the center of the rolling rolls.

(Ill) Since the axle box of the roll is divided into inner and outer parts and the outer axle box is moved horizontally using the inner axle box as a fulcrum, no thrust force is generated on the roll, so there is little risk of meandering of the plate.

(IV) Since it is possible to apply a pending force to the lower work roll separately, and also to form a left-right asymmetric narrow roll pending curve, the ability to control the shape of the plate is significantly improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example of a conventional rolling mill, FIG. 2 is an explanatory diagram of another example of a conventional rolling mill, FIG. 6 is an explanatory diagram of an embodiment of the rolling mill of the present invention, and FIG. 4 is an explanatory diagram of an example of a conventional rolling mill. 3 is a view taken along the line IV-IV in FIG. 3. FIG. (1) (2) are upper and lower work rolls, (3) (3) is inner axle box, (51 (51 (61 is outer axle box, (9) is bending block, (10100) (I ]) old) (
1 (13) indicates a bending cylinder. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. -ri1-

Claims (1)

[Claims] 1) A rolling mill characterized in that a rolling roll is supported by bearings on an inner shaft box and an outer shaft box, respectively, and a bending device is provided for applying horizontal bending to the outer shaft box using the inner shaft box as a fulcrum. Machine.