JPH01186204A - Roll for adjusting crown - Google Patents

Abstract

PURPOSE:To smoothly generate a roll crown with no step by supporting a sleeve being put on an arbor at both ends of the arbor to be freely rotatable and installing a mechanism bearing thrust force of the sleeve, and sealing both the arbor ends. CONSTITUTION:The inner ring of large and thin bearings 21, 22 is fixed on the outside of sleeves 71, 72 having a tapered outside face putted on an arbor 1. Both end parts of a cylindrical sleeve 3 covering the outside ring and the total periphery of the bearings 22, 23 are supported by bearings 41, 42 so that the sleeve 3 is freely rotatable and thrust force of the sleeve 3 is supported by thrust bearings 51, 52. An oil hole 8 is bored in the arbor 1 to supply lubrication oil for rotation of the bearings 21, 22, the outside ring of the bearings 21, 22, and the inside face of the sleeve 3. The supplied oil is sealed by sealing mechanisms 91-94. When rolling loads are transferred from a work roll, the sleeve 3 is brought into contact with the outside rings of the bearings 21, 22 by elastic deformation to integrally rotate to control a roll crown.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a crown adjusting roll, particularly to a crown adjusting roll used in a vertically arranged multi-roll rolling mill.

(Conventional technology) In plate rolling, rectangularizing the plate profile (width direction plate thickness distribution) to achieve a good rolling shape, that is, shape control, is an important issue, and various new methods have been developed for the purpose of shape control. A rolling mill has been developed. In other words, to improve the shape and profile, it is necessary to prevent work roll deflection. Work roll bending, back unroll bending, double chock bending, roll skinny, roll shift, variable crown roll (hereinafter referred to as VC
) have been developed.

Among these, VC rolls do not require any modification, just change the rolls of existing rolling mills to VC rolls. Therefore, they are cheaper than other methods, and are effective in improving shape and profile when combined with existing roll benders. It has been utilized.

However, the VC roll has a structure in which a sleeve is shrink-fitted to an arbor, and high-pressure oil is introduced into a central pressure receiving chamber to inflate the sleeve. Therefore, due to the limit of sleeve stress, the maximum amount of expansion for a large roll with a diameter of about 1500+n is 0.2.
~0.4 was/radius.

This is sufficient for controlling ordinary soft thin plates.

However, in areas where the plate thickness is large, the amount of crown control may be insufficient even when combined with a bender.

In particular, for roughing mills for hot rolling aluminum, roughing mills for hot rolling steel, thick plate rolling mills, etc., it is desirable to have a crown control capacity two to three times the current level. Steel has high deformation resistance, and the amount of crown control is insufficient at the current capacity.

Some of the other types of rolling mills mentioned above have a high shape control ability, but they have problems such as huge equipment costs and a long period of time required for modification. Therefore, it has been desired to develop a new type of roll that is simple and inexpensive, such as the VC roll, which can provide a high-performance rolling mill by changing only the roll.

In response to such demands, a crown control system that utilizes roll eccentricity is used in Sendzi-Mya mills, variable speed multi-stage rolling mills, and the like. However, all of these are multi-high rolling mills that receive the load from a large number of rolls, and they have not been put into practical use in the vertically arranged multi-high rolling mill, which is mainly a four-high roll vertically arranged rolling mill that always receives the entire load from a single roll. Not yet. Furthermore, all of these methods are aimed at shape control in cold rolling, and are not used in shape control technology for hot rolling.

For example, in Senzimyamir, Figures 6 and 7
As shown in the figure, an eccentric ring 3 is provided on a final stage backup roll (As-U roll) 2 that supports a small-diameter work roll 1 to perform crown adjustment.

In addition, in a multi-stage rolling mill with different circumferential speeds,
As shown in the figure, by changing the tension control priddle roll 4 to an eccentric roll, changing the angle of the shaft 5, and changing the outer diameter envelope crown from concave to convex, the tension distribution in the rolled material can be changed and the workpiece A method is used to adjust the horizontal deflection of the roll.

Furthermore, in the rolling mill disclosed in Japanese Patent Publication No. 55-35202, the sleeve is divided into three parts, which are loosely fitted into the roll body, and the center axis is offset from the axis of the roll body, thereby changing the roll crown. It has a mechanism.

However, rolls with such a mechanism have a step on the generatrix of the roll, which tends to cause non-contact parts with the work roll, and force is concentrated at the corner of the outermost shaft of the backup roll, making it more likely that the work roll will be damaged. . Even if the sleeves on both sides are supported by spherical seats, this problem will only be alleviated slightly, but will not be a substantial improvement. If it is desired to reduce the level difference, it will be necessary to divide the sleeve into many parts and reduce the level difference for each sleeve, but the mechanism is complicated and maintenance is troublesome with the serrated structure.

(Problems to be Solved by the Invention) Thus, an object of the present invention is to provide a crown adjustment roll that can smoothly generate a relatively large roll crown without any steps, mainly for hot rolling, in a vertical roll arrangement type multi-high rolling mill. It is about providing.

(Means for Solving the Problem) Here, the present invention fixes an inner ring by tilting a plurality of bearings in a symmetrical manner on a straight arbor, and at the same time fixes an inner ring on a straight arbor. The arbor is fitted with a cylindrical sleeve and is rotatably supported at both ends of the arbor, and a mechanism is provided at both ends to receive the thrust force of the sleeve, and a sealing mechanism is provided at both ends of the arbor. , a roll capable of sealing oil supply from an oil hole provided in the arbor, and a crown adjustment roll further provided with an arbor angle adjustment device attached to an end of the arbor.

Further, in a preferred embodiment of the present invention, the inner surface of the cylindrical sleeve of the crowned m-type roll is chamfered at the position where it contacts the inclined bearing separation part, that is, a recess is provided on the inner surface of the sleeve. good.

In the crown adjustment roll according to the present invention, the outer ring of the bearing fixed to the arbor functions as a concave deformation support for the rotating sleeve. The arbor angle adjustment device changes the rotation angle of the arbor to change the roll crown. In addition, to make the change in the crown even smoother,
The sleeve is loosely fitted onto the outer ring of the bearing, and both ends are supported for rotation.

Here, one feature of the crown adjustment roll of the present invention is that a sealing mechanism is provided between the arbor and the sleeve, which allows the oil supplied inside the sleeve to maintain a higher pressure. , so the following effects can be obtained.

■The frictional force between the inner surface of the sleeve and the outer surface of the bearing is reduced, reducing wear and smoother rotation.

■Effective in preventing seizure and fatigue cracks.

■The durability of the hair ring is further improved.

By the way, the crown adjustment roll of the present invention can be used in the following rolling mills, for example.

That is, in recent years, thin-walled roller bearings have been developed for large rolling mills for rolling thick plates, and the width of this bearing is about 80 hm and can withstand a load of about 2000 mm. Therefore, by applying the present invention to this thin-walled large bearing, a crown adjustment roll that changes from a concave crown to a convex crown can be constructed, and a vertically arranged multi-stage roll type as shown in FIGS. Introduce at least one roll into the bank-and-roll of the rolling mill (if the roll that comes into direct contact with the rolled material is the work roll, all rolls other than the work roll are backup rolls), and combine it with the existing roll bender to create shapes and profiles. control.

In a preferred application example of the present invention, at least one crown adjusting roll according to the present invention is introduced into a backup roll of a vertically arranged multi-stage rolling mill, and the angle in the circumferential direction of the arbor of this roll is adjusted. Adjust the outer diameter generatrix shape to any crown within the range of concave crown to convex crown, combine the roll bender, and control the shape and/or profile of the rolled material according to the signal from the crown detector of the rolled material. That's what I do.

In this way, the roll according to the present invention can have a large roll crown amount, for example, a diameter of 1500 m.
With a roll of m, a roll crown amount of about 1.0 s + w can be easily obtained. That of VC role is 0.2~0
．． 6 It can be seen that the effect of the present invention is remarkable, as the amount of change is 3 to 5 times greater than that of 4m+w.

(Operation) Next, the present invention will be described in more detail with reference to the accompanying drawings.

The basic roll structure of the present invention is shown in FIG.

In the basic roll shown in FIG. 1, a large thin bearing 21.
Fix the inner ring of 2. Sleeves 71, 72 and arbor 1,
The inner ring of the bearing 21.22 and the sleeve 71.72 are fixed together by shrink fitting, cold fitting, tight fitting, keying, or the like.

The load is transmitted from the work roll or the intermediate roll, and what rotates during rolling is the outer ring of the bearing 21, 22 and the sleeve 3 that covers the entire outer periphery of the outer ring. Both ends of the sleeve 3 are rotatably supported by bearings 41 and 42, and thrust force is supported by a thrust bearing 5L 52.

61.62 is mouth, knut.

The arbor 1 is provided with an oil hole 8 for supplying oil, and rotational oiling of the bearing 21.22 and lubrication between the outer ring of the bearing 21.22 and the inner surface of the sleeve 3 are performed. 91.9
2.93.94 is a sealing mechanism that seals the oil supply and is composed of a seal ring, support ring, etc.

IO is a rotary joint for supplying oil from the outside, but it may also be of an oil-tight type.

An arbor angle adjusting device 11 is provided at one end of the arbor 1, and the rotation angle of the arbor, in other words, the roll crown can be arbitrarily selected. The bevel angle of the inner sleeve 71.72 is α,
If the bearing width is 2, the crown will be δ-2α.

If there is a work roll on the lower side of FIG. 1, it will become a concave crown, and if the arbor l is rotated 180 degrees, it will become a convex crown. Therefore, by adjusting the circumferential angle of the arbor 1, the roll crown can be adjusted in the range of approximately 2δ from -δ to +δ.

When the rolling load is transmitted from the work roll, the cylindrical sleeve 3 contacts the bearing outer ring due to elastic deformation at the position where it contacts the work roll, and the cylindrical sleeve 3 rotates together with them, resulting in a roll crown formed by the hair ring outer ring.
Control from δ to +δ becomes possible.

Although Fig. 1 shows a two-part bearing arrangement,
As shown in Fig. 2, the inner sleeve is divided into 3 parts 71, 72, 73 and the bearing 21, 22, 23, and the central bearing 22 is fixed horizontally and the bearings 21 and 23 on both sides are fixed at an angle. +δ to -δ may be formed, or may be further divided into more parts.

Also, the sleeves 71, 72, 73 are omitted, and the bearing 2
It goes without saying that 1.22.23 may be directly fixed to the arm, and in that case, the same effect can be obtained if the inner ring of the bearing 21.23 is machined with a desired inclination.

Furthermore, in a preferred embodiment of the present invention, in the roll structure described above, at a position where the inner surface of the sleeve 3 abuts the separation part, that is, the cut, of the inclined bearing, the surface pressure between the corner part of the bearing and the inner surface of the sleeve becomes abnormally high. , spalling on the inner surface may occur, so please refer to Figure 4.
(It is preferable to chamfer and form a recess at the position where the inner surface of the sleeve contacts the bearing separation part, as shown in bl, to avoid direct contact between the bearing corner part and the inner surface of the sleeve.

Fig. 4 ta+ is an example in which the inner surface of the sleeve at the central separation part of the two-part bearing shown in Fig. 1 is chamfered;
1 is an example in which the inner surface of the sleeve is chamfered at the two separated portions of the three-part bearing shown in FIG.

In addition, as yet another modification, instead of providing the recessed portion on the inner surface of the sleeve as described above, a corner portion of the bearing portion corresponding to the sleeve chamfered portion may be chamfered.

As mentioned above, this rotating sleeve 3 is rotatably supported at both ends by bearings 41 and 42, and is supported by a thrust bearing 51.
．． 52 receives thrust, but as a modification example, a conical roller bearing or a double-row ball bearing is used for the bearings 41 and 42, and the sleeve 3 and the outer ring of the bearing 41 and 42 are fixed to support the rotation of the sleeve. A simple structure that simultaneously has the function of receiving thrust loads and thrust loads is preferable.

In addition, self-aligning bearings are used for the bearings 41 and 42 to simultaneously receive radial and axial loads, and when the sleeve 3 is bent by an external load, the outer ring of the bearing acts to smoothly match the inclination of the sleeve. Structure is desirable.

Thus, in the rolling operation using the roll according to the present invention, at least one of the crown adjusting rolls described above is added to the backup roll of the vertical roll arrangement shown in FIGS. 3(A) to 3(F). The introduced system can be combined with existing roll benders (work roll bending, bank up roll bending, double chock pending, etc.) to control the shape and profile of the board. The rotation angle (crown value), calculate the roll vendor value. Rolling is performed by controlling the angle of the backup roll and the roll pending force so as to achieve this calculated value.

The angle adjustment of the bank unroll using the crown adjustment roll according to the present invention can also be performed sequentially during rolling. However, normally, it is easy to set the value in advance to an appropriate value depending on the dimensions, material quality, temperature, etc. of the rolled material, and mainly control the roll pending force during rolling. It is desirable to simultaneously control the pending force of the roll bender and the amount of crown of the backup roll in order to correct defects in the composite elongation shape of a single cold-rolled product. In this case, an electric motor or a hydraulic device is used so that the movement of the arm angle adjustment device provided at the journal end of arm 1 of the back unroll can follow high-speed rolling, and high-speed, high-precision angle positioning control is performed. Since this device is normally used for presetting, an inexpensive positioning mechanism consisting of a worm and a worm wheel is sufficient.

Next, the effects of the present invention will be confirmed through Examples.

Embodiment The crown adjustment roll according to the present invention shown in FIG.
It was installed as a bank-up roll in a roll vertically arranged multi-stage rolling mill having the structure shown in Figure (A), and rolling was carried out.

Figure 5 shows work roll diameter 760mm, bank up roll diameter 1600mm, barrel length 1800+1f (7
) Sleeve thickness is 50t to 150t for rolling mills.
This is the calculation result of the amount of deflection of the sleeve when a load of 1 ton/piece is applied to a position where the sleeve length is 1500+mm.

If the load level changes, each deflection curve may be shifted in proportion to it. If a crown change of δ-III is desired, the length and inclination angle of the bearings 21, 22 are set so that δ=1 mm. 1-750mm α=
It becomes δ-11 at 0.076°. Rolling load 1 ton/
■At 100t, the center deflection is 1.8ms+, 125t
Since the diameter is 1.2 mm, the inner surface of the sleeve contacts the outer ring of the bearing 21.22, so the sleeve recess is received by the arbor 1. During rolling, the sleeve 3 and the outer ring of the bearing 21.22 rotate, and the arbor Crown control is possible by adjusting the angle in step 1. That is, in this case, the sleeve thickness is desirably 100 to 125 mm.

However, if the rolling load were to be halved to 0.5 ton/ms, the deflection would also be halved, so at 100 to 125 t, the inner surface of the sleeve and the outer ring of the bearing did not come into contact and the sleeve 3
only rotates. Since the internal stress of the sleeve increases, high-quality materials are required, but the sleeve thickness can be reduced to 75 to 85 tons.
If this is done, even at 0.5 ton/++-, the three 7'' will bend and hit the bearing, making the design easier in terms of stress.

Moreover, the provision of a sealing mechanism provides excellent wear resistance and durability, and by forming a recess on the inner surface of the sleeve at a location corresponding to the separation part of the inclined bearing, a significant life extension can be achieved. can.

(Effects of the Invention) As detailed above, according to the present invention, a roll with a large crown control effect can be obtained, and its significance is great because of its remarkable effects.

In particular, compared to the crown adjustment roll proposed in the previous patent application No. 108495 of 1988, the provision of the above-mentioned sealing mechanism improves the roll's durability, abrasion resistance, spalling resistance, and accident resistance. Excellent effects can be obtained, and its significance is great.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a crown adjustment roll according to the present invention; FIG. 2 is a schematic sectional view similar to FIG. 1 of a modified example; FIGS. 3(A) to 3(F) are A schematic explanatory diagram showing the structure of a rolling mill to which the present invention is applied: FIGS. 4(a) and 4(b) are explanatory diagrams showing how the sleeve is chamfered; FIG. 5 shows data in an example Graph; FIG. 6 is a schematic explanatory diagram showing the roll structure of a conventional example; FIG. 7 is a sectional view taken along the Vll-Vll line in FIG. 6; FIG. 8 is a schematic explanatory diagram showing another example. and FIG. 9 are cross-sectional views taken along line IX-IX in FIG. 8. l: Arbor 3: Sleeve 21.22 F Bearing 41.42: Bearing 51.52: Thrust bearing 7L72:
sleeve

Claims (1)

[Scope of Claims] A straight arbor, a plurality of bearings having inner rings fixed to the arbor in a symmetrically inclined manner, and a plurality of bearings fitted onto the outer rings of the bearings and rotatably supported at both ends. , a cylindrical sleeve that freely rotates with respect to the roll axis; a mechanism provided at both ends of the sleeve to receive the thrust force of the sleeve; and an oil hole provided in the arbor between the arbor and the sleeve. A seal mechanism that allows the oil supply to be sealed,
and an arbor angle adjusting device provided at an end of the arbor.