JPS59153504A - Rolling mill - Google Patents

Abstract

PURPOSE:To control rolling to make the cross-sectional shape of a rolling plate excellent by attaching roll chocks for supporting divided work rolls and roll chocks exclusively used for work roll bending to the axes of the work rolls respectively so as to move the chocks in one body with the work rolls. CONSTITUTION:Upper and lower work rolls 6, 7 are shifted in their axial directions by shifting devices 17, 18 to make the distance (l) between the rolls 6, 7 in the longitidinal direction of their cylindrical parts approximately equal to the width of a rolling plates S. In this case, roll chocks 8 for work rolls and chocks 19, 20 used exclusively for work roll bending are moved in one body. And, at the times of biting and running out of the plate S, the rolls 6, 7 are held to be in a prescribed distance by actuating roll balancing pistons 11, 12. Further, the rolls 6, 7 are deflected to prescribed forms through the roll chocks 19, 20 to control the shape of the plate S.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill that can be made in one unit and that can improve the cross-sectional shape of a rolled plate.

In a conventional rolling mill, as shown in FIG. 1, the upper and lower work rolls a and b are arranged vertically symmetrically with respect to the bus line, and are not shifted in the axial direction. For this reason, when the rolled plate S of the same width is continuously rolled, the upper and lower work calls a,
Step wear progresses in b. Therefore, when rolling a wide plate after this, marks of step wear will be left on the plate, degrading the quality of the rolled plate.

On the other hand, as shown in FIG. 2, the upper and lower work rolls a, b
A hydraulic piston C applies a load vector as shown by the arrow f to the axle boxes c and d at both ends, and roll pending is applied to the two lower work rolls a and b, and the thickness distribution in the width direction of the rolled plate S is A method of controlling is generally used. However, in this method, when the width of the rolled plate S becomes narrow, the work rolls a and b and the backing rolls h and i in contact with the work rolls a and b are
If the rolled plate S has a narrow width, the effect of roll pending cannot be fully exerted because the "contact part" becomes a hindrance.

Therefore, as one of the methods to solve such problems, the third method is proposed.
As shown in FIG. A system in which unnecessary contact portions of the hold-up rolls h, 1 are eliminated has been proposed for fM in order to increase the effectiveness of work roll pending.

However, in the case of this method, 1) The axle box for one work roll benzo ink and the axle box for supporting the work roll are used together, and the axle box c
, d must be arranged 5Q close to the stepped portions of the work rolls a and b, so the bending firm length Q of work roll bending becomes small, and therefore the work roll bending effect is not sufficiently large.

ii) The roll benzo ink load may be large or small depending on the rolling conditions. Therefore, in the case of increase benzo ink and the roll benzo ink load is small, or in the case of day crease benzo ink, the axle box for the work roll benzo ink and the axle box for supporting the work roll are also used as mentioned above. , it is not possible to maintain the necessary roll balance load immediately after the bottom of the rolled plate S is pulled out, or when the rolled plate S is bitten or pulled out. Therefore, it is necessary to switch the hydraulic pressure as the rolled plate S is bitten or pulled out, making the operation complicated.

1ii) The thrust bearing built into the axle box, which also serves as a bearing, is subjected to rolling thrust, so it is inherently loaded with a large load.Furthermore, if a large load necessary for roll bending is applied, the life of the thrust bearing will be significantly shortened.

There are some drawbacks such as.

In addition to these shortcomings, there are various other shortcomings, but these shortcomings are fundamentally caused by the fact that the same axle box serves as both the work roll support axle box and the work roll bending axle box. There is.

In the above explanation, the roll balance load is used to provide mutual tension between the upper and lower work rolls to maintain a specified distance between the rolls and to prevent slips between the backing roll and the work roll. The constant tensile force between the rolls has been provided in the 4HI rolling mill since before the advent of roll bending equipment.

On the other hand, roll bending refers to changing the roll benzo ink load in the positive and negative directions at the roll neck in order to vary the roll deflection depending on the shape of the rolled plate, and has been carried out for several years. This is a method that

In this case, the roll bending load is used while varying its magnitude depending on the shape of the plate, so there is no need to keep a constant load as in roll balance. The roll balance load is not used on the shape side j10, but the roll benzo ink load is the bending variable control ill load m for the shape control Jl].

The present invention is designed to shift an axle box related to a work roll integrally with the work roll, which only supports the work roll and does not have a work roll benzoink effect for shape control.
An axle box for supporting the work roll, which has the function of applying a roll bending load, but does not have the function of supporting the work roll, and a dedicated shaft for work roll bending, which can shift depending on the weight of the work roll. By providing a box, a large roll bending load can be applied and fM
At the same time, the bending arm is lengthened to increase the bending effect during rolling of the narrow plate to give variety to the curves applied to the surface of the work roll, and to improve the cross-sectional shape of the rolled plate. ) i! The purpose of the present invention is to provide a rolling mill that is as impressive as I42.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a front view of the rolling mill of the present invention, and FIG. 6 is a front view of the rolling mill of the present invention.
FIG.

The upper and lower restraint rolls 2 and 3 are rotatably supported by the upper and lower restraint roll shaft boxes 4 and 5, which are fitted in the housing 1 and can slide up and down. 1 and roll balance reaction force: Lower roll 2, 3
The upper and lower work rolls 6.7, which are supported by Wait and install the upper and lower work roll support shaft boxes 8 and 9 that only support the upper and lower work rolls 6 and 7 and do not have a work roll bending action for shape control, and then install the upper and lower work roll support shaft boxes 8 and 9. 1111 housing 1
The blades are fitted so that they can slide in both the upper and lower blade directions and the roll axis direction.

The beam 10 is fixed to the required position of the window part of the housing 1 so as to be placed between the upper and lower work rolls 6.
The roll balance pistons 11 and 12 are fitted into the upper and lower work roll support shaft boxes 8 and 9 that face each other, and the lower ends or upper ends of the roll balance pistons 11 and 12 abut against the beam 10, so that the upper and lower work rolls 6.7 to be able to apply the necessary roll balance load.

Of the left and right upper and lower work roll support shaft boxes 8 and 9, on the sword,
As shown in FIG. 6, the protruding arms 8a and 9a of the rolling mill are fixed, and a screw shaft 13.14 that can be rotated by an appropriate means toward the outside of the housing 1 is provided. A roll shifting device 17.1 consisting of a nut 15.16 etc. which can be moved in the direction of the roll axis force by
8 is arranged, and 1111 upper and lower work roll holding boxes 8 and 9 are installed.
The tips of the arms 8a and 9a attached to the rollers are engaged with the nuts 15 and 16 of the roll shift device 17 and 18.

1111 An axle box 19 exclusively for vertical work roll bending, which has a function of applying a roll bending load to the top and bottom work rolls 6.7, but does not have a function of supporting the top and bottom work rolls 6.7, at a required position of the top and bottom work rolls 6.7. ', 20
are installed so that they can be shifted in the roll axis direction integrally with the upper and lower work rolls 6°7.

Beams 21 are installed at required positions above and below the window portion of the housing 1.
.
, 24 can apply increase bending to the upper and lower work rolls 6.7 by abutting the lower or upper ends of the beams 111 and 24, and +iiJ shaft boxes 19 and 20 exclusively for bending the upper and lower work rolls are provided in opposite directions. The defrozen pending pistons 25 and 26 are fitted into the surface, and the upper and lower ends of the pistons 25 and 26 abut against the beams 21 and 22, so that the upper and lower work rolls 6
,7.

When rolling is carried out in a rolling mill with a cutting edge, the upper and lower work rolls 6.7 are shifted in the roll axis direction by the roll shift device 17.18, and the interval Q1 in the longitudinal direction of the cylindrical length of the upper and lower work rolls 6.7 is adjusted to approximately the rolling plate S. Match the plate width. In this embodiment, as shown in FIG. 6, the shifting of the upper and lower work rolls 6°7 is carried out via the right-hand one of the upper and lower work roll support shaft boxes 8 and 9; The roll support axle boxes 8, 9, and the left and right axle boxes 19.20 dedicated to lower work roll bending also move integrally with the upper and lower work rolls 6.7.

When the rolled plate S is jammed or the bottom is removed, the roll balance piston 1 attached to the upper and lower roll support shaft boxes 8 and 9 is used.
1.12 is operated by pressure oil to create upper and lower work rolls 6.7
The interval is maintained at a predetermined interval.

The rolled plate S is rolled by upper and lower work rolls 6.7,
The pressure adjusted to a predetermined pressure is sent to the freeze bending pistons 23, 24 or the defroze pending pistons 25, 26, and as a result, the upper and lower work rolls 6.7 are moved to the upper and lower work roll bending shafts. The shape of the rolled plate is controlled by bending (work roll bending) into a predetermined shape through the boxes 19 and 20.The roll axis direction positions of the upper and lower work rolls 6 and 7 and the increase bending pistons 23 and 24 and day crease bending are controlled. Various work roll surface displacement curves can be obtained by variously changing the pressure of the pressure oil supplied to the pistons 25 and 26. Therefore, the rolled plate S may have elongation at the end or a quarter buckle. Good shape control can be achieved even when the shape is complex.

As mentioned above, roll balance is provided via the upper and lower work roll support axle boxes 8 and 9, so the axle boxes 19 and 20 dedicated to upper and lower work roll bending can be controlled independently of the hydraulic system of the roll balance system. Therefore, the number of changes in hydraulic pressure due to the rolling plate S being jammed or pulled out is reduced, and even in the case of switching, the switching time is shortened.

In the embodiments of the present invention, a case has been described in which a balance piston or a benzo ink piston is used to apply roll balance or a roll benzo ink to a work roll. The roll balance device and the roll bending device may be provided at the heel, and the roll balance device and the roll bending device may not be shifted during shifting, and various modifications may be made without departing from the gist of the invention. Of course, changes may be made.

According to the rolling mill of the present invention, since the (+) J: 1 work roll can be shifted in the direction of the axial force, the wear of the upper and lower work rolls can be made uniform in the roll axis direction. Therefore, the product quality of the rF rolled plate is improved, and the life of the upper and lower work rolls is extended, so that equipment costs and operating costs are reduced.

(It) Due to the shift of the upper and lower work rolls, the upper and lower work rolls and the upper and lower backing rolls do not come into contact with each other over their entire length. Because of this, it is easy to give hedding to the upper and lower work rolls, and the effect of the roll benzo ink is improved. This roll benzo ink effect is particularly noticeable on narrow plates.

(] [) Since the piston for roll balance and the piston for roll bending are provided separately, it is possible to stably perform roll bending even in mills where the plate is jammed or the end falls out.

0 Since the effects of 01j (It) and (2) can be simultaneously obtained by rolling a narrow plate in which the roll balance ability due to rolling load is reduced, a large roll bending effect can be obtained stably.

etc., and has various excellent effects.

[Brief explanation of the drawing]

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. 3 is an explanatory diagram of yet another example of a conventional rolling mill, and Fig. 4 is an explanatory diagram of another example of a conventional rolling mill. 3 is a bottom view of FIG. 3, FIG. 5 is an explanatory diagram of an embodiment of the rolling mill of the present invention, and FIG. 6 is a bottom view of the work roll section of FIG. In the figure, 1 is a housing sink, 6 is an upper work roll, 7 is an F work roll, 8 is an upper work roll support shaft box, 9 is a do ('I work roll support shaft box, 11.12 is a roll balance piston, 1
7. 18 is a roll shift MK (, 19 is an axle box exclusively for upper f1 roll bending, 20 is an axle box exclusively for lower work roll bending, 23 and 24 are increase ink pistons, and 25 and 26 are machine creases) Showing the bending piston. Special edition RL, l'i Ishikawajima Harima Heavy Industries

Claims (1)

[Claims] 1) A work roll support shaft box and a dedicated work roll bending shaft box, which are divided into work roll shafts, can be moved integrally with the work roll when the work roll is shifted in the roll axis direction by a roll shift device. A rolling mill characterized by being installed as follows.