JPH03248704A - Adjustable crown roll and rolling mill with it - Google Patents

Abstract

PURPOSE:To obtain an adjustable crown roll which is made into an arbitrary sheet crown by proving an arbor, plural bearings which are obliquely fixed so that chevron parts no less than two are formed into M- or W-shape to the arbor in the direction of the axis of arbor and a device for adjusting arbor angle at the end part of arbor. CONSTITUTION:Five bearings 13, 14, 15 are obliquely fixed into W- or M-shape to the arbor 12 and the vertexes of the chevron parts have the difference of -delta0, +delta0 in level respectively. The oblique fixation of each bearing 13-15 is performed through an eccentric bushing and a sleeve 18 is set outside the bearings 13-15. For executing crown setting, when the arbor 12 is turned by the angle theta with the device for adjusting angle (not shown in the drawing) which is mounted at the axial end, the roll crown in the middle part of arbor can be continuously changed from M-shape to W-shape. That is, the crown can be adjusted into M-shape when the arbor angle is 0 deg., a straight line when 90 deg. and W-shape when 180 deg..

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a crown adjustment roll having a large composite control ability, that is, the ability to control composite elongation such as quarter elongation or middle end elongation of a rolled material, and a crown adjustment roll equipped with the same. This relates to rolling mills.

(Prior Art) In plate rolling, it is an important issue to make the plate profile (width direction plate thickness distribution) rectangular and obtain a good rolling shape, and rolling mills based on various new methods have been developed.

For example, shape/profile improvements require work roll deflection compensation. Work roll bending, backup roll bending, tuffle chock bending, roll skew, roll shift, variable crown roll (hereinafter referred to as hydraulic VC roll), etc. have been developed. No modification is required, just change the roll of the machine to a hydraulic VC roll. Therefore, it is cheaper than other methods and has been effectively used in combination with existing roll benders to improve shape and profile. FIG. 10 shows a conventional example of a hydraulic VC roll, in which a sleeve 12 is attached to an arbor 120.
2 is shrink-fitted, high-pressure oil is introduced into the central pressure receiving chamber 126 of the arbor 120 through the oil supply hole 124, and the amount of crown of the sleeve 122 is adjusted.

However, the hydraulic VC roll has a structure in which the sleeve is shrink-fitted to the arbor and high-pressure oil is introduced into the central pressure-receiving chamber to inflate the sleeve.
Maximum expansion amount is 0.2 with a large roll of about 500a+m
It is approximately 0.4 mm/radius. This amount of bulge is sufficient for controlling normal soft thin plates, but in areas where the plate thickness is large, the amount of control may be insufficient even when combined with a bender. In particular, for roughing mills for hot rolling of aluminum, roughing mills for hot rolling of steel, thick plate rolling mills, etc., it is desirable to have a control capacity two to three times greater than the current level. In addition, even with thin plates, hard materials and special steels have high deformation resistance, and current capacity is insufficient.

On the other hand, although some of the other types of rolling mills mentioned above have high controllability, they have problems such as enormous equipment costs and long-term remodeling. Therefore, it has been desired to develop a new type of roll that is simple and inexpensive, such as a hydraulic VC roll, in which a high-performance rolling mill can be obtained by changing only the roll.

By the way, in Japanese Patent Publication No. 55-35202, a mechanism is adopted in which the sleeve is divided into three parts and loosely fitted into the roll body, and the central axis is made eccentric from the axis of the roll body, thereby changing the roll crown.

However, this roll has a step on the generatrix of the roll, so
When used as a hack-up roll, non-contact parts with the work roll tend to occur, force is concentrated at the corner of the outermost shaft of the backup roll, and the work roll is likely to be damaged. Even if the sleeves on both sides are supported by spherical seats, this problem will only be alleviated slightly, but will not improve the quality of the wood. If an attempt is made to reduce the level difference, it is necessary to divide the sleeve into many parts and reduce the level difference for each sleeve, making the mechanism complicated and maintenance difficult.

In order to solve these problems, Japanese Patent Application Laid-Open No. 63-273504 discloses a round adjustment roll (
100 (hereinafter referred to as mechanical VC roll) has been proposed. In the figure, five bearings 102 and 104 are fixed to the arbor 106 at an angle in a convex or concave manner, and a sleeve 108 is loosely fitted on the outermost surface. In this mechanical VC roll, the amount of crown is secured by the amount of inclination of each bearing.

That is, the bearing 102 is
．． By fixing the slope of 104, the height difference δ is obtained. Gives only a mechanical crown. Assuming that the rotation angle of the arbor 106 is θ, by changing this, the amount of crown at the center of the arbor is +δ. It is possible to change continuously from a convex crown of -60 to a concave crown of -60.

Therefore, by introducing this mechanical VC roll into a rolling mill, a larger control amount can be obtained compared to the conventional hydraulic VC roll.

Furthermore, in Japanese Patent Publication No. 63i1641, the center portions of the arbor 130 and the sleeve 132 are shrink-fitted as shown in FIG. Arbor 130
A ring 134 is provided at the open end of an annular space 131 formed between the ends of the annular space 131 to make the annular space liquid-tight. A T-roll, a P-roll, and a roll having a liquid-tight chamber 138 formed on the side and a pressurized liquid supply passage 140 communicating with the liquid-tight chamber are also proposed.

According to this, by adjusting the hydraulic pressure to both liquid-tight chambers 138, the annular space 131, which is a taber ring or stepped portion provided at the end of the arbor, is moved in the longitudinal direction of the arbor,
This mechanically changes the roll crown.

In this specification, the rolls shown in FIG. 11 are referred to below as T and P.
, called a roll.

On the other hand, in recent rolling, the well-known literature "Plasticity and Processing"
“Analysis method of plate shape characteristics and control function of conventional rolling mill”, v
As shown in OL, 23, N (1263 (1982-12)), there is a desire for a significant improvement in the composite control function.In other words, although roll deflection due to rolling load is quadratic, The plate crown of rolled material generally has high orders of 2nd and 8th orders, and the heat crown that occurs on the work roll during rolling is generally trapezoidal and has a sudden change part near the edge of the plate. Heat Crown also has higher-order components.

Therefore, if the control means of the rolling mill can only compensate for the secondary component of roll deflection, compound elongations such as quarter elongation or mid-end elongation will occur in the rolled material, resulting in a dead flat plate. In order to obtain this, it is necessary to have another control means that can control these composite elongations.

(Problem to be Solved by the Invention) Since the control effect of the above-mentioned hydraulic VC roll, mechanical VC roll, or T, P, roll is almost a quadratic component, roll deflection can be compensated for, but complex shape control This is not sufficient from the viewpoint of performance, and there has been a desire for a control means that further enhances the ability to control complex shapes.

Therefore, the present invention has been made in view of the above-mentioned problems, and its object is to provide a crown adjustment roll with a large ability to control complex shapes, and a rolling mill equipped with the same.

Yet another object of the present invention is not to compensate for roll deflection (secondary component), but to be able to freely control compound elongation, especially quarter elongation or mid-end elongation. It is to provide.

(Means for Solving the Problems) The present inventors have made various studies to achieve the above object, and have obtained the following findings, leading to the present invention.

That is, instead of the conventional convex or concave roll crown, a roll crown formed by arranging a plurality of bearings so that two or more chevrons are formed in the arbor axis direction in an M-shape or W-shape is used. The present invention was completed based on the knowledge that the above object can be achieved by the crown adjusting roll having the present invention.

In addition, the present inventors have realized a rolling mill with high composite elongation control ability by using the crown adjustment roll alone or in combination with a second crown adjustment roll having the conventional ability to control secondary components. After learning that this could be done, he completed the present invention.

Here, the gist of the present invention is to provide an arbor and a plurality of hair rings that are tilted and fixed to the arbor in an M-shape or W-shape such that two or more chevrons are formed in the arbor axis direction. and an arbor angle adjusting device attached to an end of the arbor.

In addition, from another aspect, the present invention includes an arbor, a plurality of bearings eccentrically fixed to the arbor in an M-shape or W-shape, and an arbor angle adjustment device attached to an end of the arbor. This is a crown adjustment roll characterized by the following features:

According to a preferred embodiment of the present invention, the above-mentioned crown adjustment roll may be configured to include a cylindrical sleeve loosely fitted to the outermost periphery of the roll.

In this way, a rolling mill may be constructed by including at least one crown adjusting roll obtained by the present invention.

Further, at least one second crown adjustment roll may be further provided.

According to a preferred embodiment of the present invention, the second crown adjustment roll can be selected from the following:

(2) A mechanical VC roll comprising an arbor, a plurality of bearings tilted and fixed to the arbor in a convex (concave) manner, and an arbor angle adjustment device attached to the end of the arbor.

■Shrink fit the sleeve to the arbor and introduce it into the central pressure receiving chamber,
Hydraulic VC roll that adjusts the crown of the sleeve.

■A sleeve is fitted to the arμ, and at least one of the arbor end and the sleeve end is made into a stepped shape, and the annular space formed between the sleeve end and the tapered end is provided with a ring at the open end. A T, P, roll having a ring spacer fitted in the annular space, a liquid-tight chamber formed on the end surface side of the ring spacer, and a flow path for supplying pressure liquid communicating with the liquid-tight chamber.

In the case of the mechanical VC roll (2), a cylindrical sleeve loosely fitted to the outermost portion of the roll may be further provided.

(Operation) The configuration and operation of the present invention will be explained in more detail based on the accompanying drawings. In addition, each drawing is iii! ,; the same reference numerals represent the same members.

FIG. 1 is a partial sectional view showing an embodiment of the crown adjustment roll 10 according to the present invention, in which five hair rings 13, 14, 15 are fixed to the arbor 12 at an angle in a W-shape or an M-shape. The apex of the chevron-shaped portion of the W-shaped portion or the M-shaped portion, which is located at approximately a quarter of the board width with respect to the center portion, is −δ. , +δ. There is only a step. The tilting fixation of each bearing takes place via an eccentric bush 16.

In the illustrated example, a sleeve 18 is fitted onto the outside of the hair ring 13, 14, 15.

What rotates during rolling in this crown adjustment roll is
These are the sleeve 18, the outer rings of the bearings 13 to 15, the thrust bearing 20, and the thrust receiver 22.

To set the crown according to the rolling conditions, set the arbor 1.
2 is rotated by a rotation angle θ by an angle adjustment device (not shown) attached to the shaft end. This makes it possible to continuously change the roll crown at the center of the arbor from an M-shape to a W-shape. That is, in the illustrated example,
Changes in the arbor axis direction of the roll crown are shown in Figure 4 (a).
As shown in , the arbor rotation angle is O'' in an M-shape, 90''.
It can be adjusted in a straight line at 180°, and in a W-shape at 180°.

FIG. 2 similarly shows an embodiment of the present invention, in which four bearings 14, 15 are tilted and fixed to the arbor 12 in a W-shape or an M-shape. In this case as well, -δ is achieved by adjusting the rotation angle θ of the arbor I2 as in the previous example. From +δ. It is possible to control the quota section up to. For the roll crown change at this time, see also Fig. 4~).

The number of bearings may be appropriately selected depending on the ratio of the roll body length to the roll diameter, and of course, the number of bearings may be five or more, for example.

Even if a large number of bearings are used and there are two or more, for example four, chevron-shaped portions in the arbor axis direction, it is sufficient that the overall shape is a repeating M-shape or W-shape.

FIG. 3 shows another embodiment of the crown adjustment roll according to the present invention, in which the bearing 3 is
1, 32, and 33 are each eccentrically fixed in a W-shape (CM-shape). In FIG. 3, a sleeve 18, a sleeve end thrust receiver 22, and a thrust bearing 20 are arranged at the outermost periphery of the roll as in the case of FIG. 1.

In this case as well, the roll crown can be changed continuously by rotating the arm μ 12 by the rotation angle θ using an angle adjustment device (not shown) attached to the shaft end. As shown in FIG. 4(C), in this case as well, it becomes M-shaped when θ=0, and becomes W-shaped when θ-180''.

Incidentally, FIG. 4(d) shows, for reference, changes in the amount of crown of the conventional convex (concave) mechanical VC roll shown in FIG.

With the rolls shown in Figures 1 and 2, in which the bearings are fixed at an angle, the level difference between each bearing can be reduced to 0, which alleviates the stress concentration at the end of each bearing. It is advantageous from this point of view.

However, from the point of view of manufacturing the roll, the eccentric structure roll shown in Figure 3 is easier, and when the load is low or the amount of control is small, the roll shown in Figure 3 is sufficient for practical use. obtain.

Next, FIG. 5 shows an embodiment of an arbor angle adjustment device for performing crown adjustment of a crown adjustment roll according to the present invention.

FIG. 5 shows an arbor angle adjusting device 50 having a hydraulically driven rack and pinion mechanism, in which a central pinion shaft 52 is connected to the end of the arbor 12 shown in FIGS. The arbor angle adjustment device 50 includes a frame 5
4 to a chock (not shown).

Therefore, by applying hydraulic pressure, Ranokrond 5
6 is movable, and its movement is transmitted to the arbor 12 via the pinion shaft 52, so that the rotation angle of the arbor can be adjusted.

Note that the angle adjustment device 50 shown in FIG. 5 is only one embodiment of the present invention, and any device may be used as long as it is capable of adjusting the angle to the arch and maintaining the angle. It may also be an electric type. Alternatively, a mechanism using a worm and a worm wheel may be used.

By incorporating at least one of the above-mentioned crown adjustment rolls according to the present invention into a rolling mill, and preferably combining them with conventional control means having the effect of controlling secondary components, a high-precision mill with large composite control capabilities can be realized. can do.

Figures 6(a) to (j) show some embodiments of crown adjustment roll combinations in such a rolling mill.

In the figure, the shaded rolls are crown adjustment rolls according to the present invention, and at least one roll may be provided.

According to another aspect, at least one of the second crown adjustment rolls described above may be further provided, particularly in combination with the mechanical VC roll or the T, P, roll, which has a large effect of controlling secondary components. This allows a very large combined control capability to be obtained, making it suitable for even high-load mills. However, in general, in skin bath mills etc., it is sufficient to combine the conventional hydraulic VC roll and the roll of the present invention in terms of capacity, and it is sufficient to ensure the necessary control amount according to each mill.

The benefit of making the second crown adjustment roll convex or concave is that it is possible to simultaneously adjust the normal medium elongation, ear wave, and composite elongation generated by the deflection (secondary component) of the roll.

Furthermore, it is possible to attach a shape sensor to a rolling mill line incorporating the crown adjustment roll according to the present invention, and to control each control means online based on the signals from the shape sensor.

Next, the present invention will be explained in more detail with reference to Examples.

EXAMPLE The crown adjustment roll according to the present invention shown in FIGS. 1 to 3 was incorporated into a backup roll (hereinafter referred to as BUR) of a 4Hi mill as shown in FIG. The shape control ability was investigated using the AQ indentation test. In addition, only conventional mechanical VC rolls, T and P
, the effects of only the roll and only the hydraulic VC roll were shown as comparative examples.

The evaluation of shape control ability is based on the above-mentioned well-known document "Plasticity and Processing""Analysis method of plate shape characteristics and control function of conventional rolling mill", vo.
This was done according to the shape plane shown in J. I., 23, Nl 1263 (1982). That is, as shown in Fig. 7, the plate width, the difference v1 between the center plate thickness and the plate thickness at 0.45W (W: plate width), and the difference ν2 between the center plate thickness and the plate thickness at 0.9W were measured and plotted on a shape plane with vl as the vertical axis and v2 as the horizontal axis.

The results are shown graphically in FIGS. 8(a), (b), and (C).

Example Nα4.6.8 is a comparative example, and the others are examples of the present invention.

The larger the area of the control range shown on the shape plane, the greater the ability to freely create any plate crown, and it can be said that the rolling mill has excellent composite control capabilities. Example 4.6.8
It can be seen that the area of the control range is larger in all of the examples of the present invention than in the case of .

In other words, as can be seen from the results of Examples 4 and 6.8, the control ability of the secondary component is better than that of the conventional mechanical VC roll, T
Even in the case of P roll and WR bending, as shown in Figure 8, it is sufficient, but the combined elongation of quarter elongation and middle end elongation! jJ jB ability is relatively small.

On the other hand, if one crown adjustment roll according to the present invention is incorporated in conjunction with these rolls, the area representing the control range will be approximately 5 to 6 times larger, and the center elongation and quarter elongation will be increased. The ability to control compound elongation is also greatly improved.

Furthermore, since the load level is low in skin bath rolling, a practically sufficient control ability can be obtained by combining the conventional hydraulic VC roll and the roll of the present invention.

Next, actual cold rolling was carried out using the rolling mills of Examples 1 to 8, shape control was performed in each mill, and the effect thereof was investigated.

The results are shown in Table 2.

Table 2 Rolling Results Note: Umbrella Comparative Example As is clear from the results shown in Table 2, the shape steepness when actual cold rolling was performed using each of the rolling mills shown in Examples 1 to 8 was When the crown adjustment roll according to the invention was used, the flatness was about 173 compared to the conventional one, and a significant improvement in flatness was obtained.

(Effects of the Invention) As shown above, the effect of the crown adjustment roll according to the present invention is very large, and the effect can be achieved by replacing only the roll of a conventional rolling mill. Facility reinforcement can be easily carried out. In addition, although the effect in the case of a 4Hr mill was shown in the example, a similar great effect can be obtained even if a crown adjustment roll for other types of rolling mills is introduced.

Furthermore, the effects of the present invention are not limited only to cold rolling, but are also exhibited in hot rolling, and the present invention has great significance in today's situations where hardening, widening, etc. are actively sought.

[Brief explanation of drawings]

1, 2, and 3 are explanatory diagrams showing one embodiment of the crown adjustment roll according to the present invention, respectively. Fig. 5 is an explanatory diagram of the crown pattern of each roll shown in Figs. ~(j) is an explanatory diagram of the type of rolling mill to which the crown adjustment roll according to the present invention is applied; FIG. 7 is an explanation of the vertical axis v1 and the horizontal axis v2 in the shape plane used to express the rolling mill control ability. Figures; Figures 8(a), (b), and (C) are graphs showing the effects of the embodiments of the present invention; Figure 9 is an explanatory diagram of a known mechanical VC roll; Figure 10 is An explanatory diagram of a known hydraulic roll: and FIG. 11 are explanatory diagrams of a known example of T, P, and rolls. 10: Crown adjustment roll 13.14.15: Bearing 18: Sleeve 20: Thrust hair ring 12: Arbor 16: Eccentric bush 22 Ni-thrust receiver

Claims (9)

[Claims] (1) an arbor, a plurality of bearings that are tilted and fixed to the arbor in an M-shape or W-shape so that two or more chevrons are formed in the axial direction of the arbor; and a plurality of bearings that are attached to the ends of the arbor. A crown adjustment roll comprising an arbor angle adjustment device. (2) an arbor, a plurality of bearings eccentrically fixed to the arbor in an M-shape or W-shape such that two or more chevrons are formed in the axial direction of the arbor; and a plurality of bearings attached to the ends of the arbor. A crown adjustment roll comprising an arbor angle adjustment device. (3) The crown adjustment roll according to claim 1 or 2, further comprising a cylindrical sleeve loosely fitted to the outermost peripheral portion of the roll. (4) A rolling mill comprising at least one crown adjustment roll according to any one of claims 1 to 3. (5) The rolling mill according to claim 4, further comprising at least one second crown adjustment roll. (6) The second crown adjustment roll is a mechanical device comprising an arbor, a plurality of bearings tilted and fixed to the arbor in a convex or concave manner, and an arbor angle adjustment device attached to an end of the arbor. The rolling mill according to claim 5, which is a VC roll. (7) The rolling mill according to claim 6, wherein the second crown adjustment roll further includes a cylindrical sleeve that is loosely fitted to the outermost periphery of the second crown adjustment roll. (8) The second crown adjustment roll is a hydraulic VC roll that shrink-fits the sleeve to the arbor and adjusts the crown of the sleeve by introducing high pressure oil into the central pressure receiving chamber of the arbor. The mentioned rolling mill. (9) The second crown adjustment roll fits a sleeve onto the arbor, has at least one of the arbor end and the sleeve end in a stepped shape, and is formed between the sleeve end and the arbor end. A ring is provided at the open end of the annular space to make the annular space liquid-tight, a ring spacer is fitted in the annular space, a liquid-tight chamber is formed on the end surface side of the ring spacer, and a pressurized liquid is supplied to the liquid-tight chamber. T. with which the supply flow path was communicated. P.
The rolling mill according to claim 5, which is a roll.