JPH03146207A - Crown adjusting roll - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a crown adjustment roll used in a vertical roll arrangement type multi-stage rolling mill.

(Prior Art) In plate rolling, it is important to rectify the temporary profile (width direction plate thickness distribution) to obtain a good rolling shape, and various new rolling mills have been developed. In order to improve the shape and profile of the strip, it is necessary to prevent work roll deflection. Therefore, work roll bending, backup roll bending, double chock bending, roll skew, roll shift, variable crown roll (hereinafter referred to as "vC roll"), etc. 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 used for

However, the VC roll has a structure in which a sleeve is fired in an arbor, high pressure oil is introduced into a central pressure receiving chamber, and the sleeve is inflated. Therefore, due to the limit of sleeve stress, a diameter of 15
Maximum expansion amount is 0.2~ with a large roll of about 00m+w
It is approximately 0.4 mm/radius. This maximum swelling amount is
This is sufficient for controlling the thickness of ordinary soft thin plates in the width direction. However, in areas where the plate thickness is large, is there any restriction even when combined with a bender? Ii may become insufficient. In particular, in rough rolling mills for aluminum hot rolling, rough rolling mills for steel hot rolling, plate rolling mills, etc.
It is desirable to have a control capacity two to three times that of a C roll, and even with thin plates, hard materials and special steel have high deformation resistance, so the 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 huge equipment costs and long-term modification requirements, so they cannot be easily introduced. It has been desired to develop a simple and inexpensive new type of roll that can easily provide a high-performance rolling mill by changing only the roll.

Therefore, the present applicant has previously disclosed a method in Japanese Unexamined Patent Publication No. 63-273504 or Japanese Patent Application No. 63-275108, in which a plurality of bearings are eccentrically fixed or tilted to the arbor and attached to the ends of the arbor. We proposed a crown adjustment roll equipped with an arbor angle adjustment device. A schematic cross-sectional view of an example of the device according to this proposal is shown in FIG.
In the figure, a plurality of (fourth
In the example shown in the figure, 5 bearings 1 to 5 are connected to the arbor 1.
The arbor 11 is fixed eccentrically or tilted through a plurality of pushers 36 to 38 fitted and fixed to the arbor 11.
By changing the angle (rotational position) of the work roll, it is possible to mechanically give a desired crown to the work roll. Therefore, according to the device according to this proposal, it is possible to give a very large round to the work roll, and as shown in FIG.
By loosely fitting the bearings, it is possible to eliminate the difference in level between the bearings, and it is also possible to reliably prevent the occurrence of uneven gloss or wear on the surface of the rolled material.

(Problems to be Solved by the Invention) As described above, according to the crown adjustment roll proposed in Japanese Patent Application Laid-Open No. 63-273504 or Japanese Patent Application No. 63-275108, compared to the conventional VC roll described above, It has a great effect on plate crown profile control.

However, according to the inventor's subsequent study, this patent publication No. 63-273504 or Japanese Patent Application No. 63-275
The maintainability of the crown adjustment roll proposed by No. 108 during actual rolling operations was not necessarily sufficient.

That is, for example, if a bearing installed in a roll is peeled off, seized, or damaged, or if only one bearing out of multiple bearings installed in a roll has an abnormality as described above, Destruction of rolls,
There is a risk of causing damage to the sleeve, leading to a major accident. Therefore, it is necessary to take some measures to avoid such dangers. However, with this crown adjustment roll, it is only possible to take countermeasures such as stopping the line and replacing the bearings according to the shortest lifespan of each of the plurality of incorporated bearings. For this reason, the frequency of roll maintenance work, that is, the removal and assembly of each bearing, has increased.
It was necessary to spend an extremely large amount of effort and time.

An object of the present invention is to provide a crown adjustment roll that can eliminate the drawbacks of the crown adjustment roll proposed in Japanese Patent Application Laid-Open No. 63-273504 or Japanese Patent Application No. 63-275108. More specifically, since the life spans of the multiple bearings used in the crown adjustment roll proposed in Japanese Patent Application Laid-open No. 63-273504 or Japanese Patent Application No. 63-275108 can be made approximately equal, maintenance work for the bearings can be made more or less uniform. An object of the present invention is to provide a crown adjustment roll that can significantly reduce the labor involved.

(Means for Solving the Problems) In order to solve the above problems, the present inventor first developed a crown adjustment roll 4111 using five double-row cylindrical roller bearings of the same size as shown in FIG. When applied as a backup roll of a mill, the magnitude of the load that each bearing 1 to 5 receives during rolling was measured by attaching a strain gauge to the inner surface of the inner ring of the bearing. The results are shown in Figures 5 and 6. Figure 5 shows the magnitude of the load received by the rollers of each bearing in the central bearing (1 in Figure 4).
), intermediate bearing (3.4 in Figure 4), end bearing (2.5 in Figure 4), and Figure 6 shows the load distribution per roller row for each roller. It shows. The rolling loads are both 600 tons and 1200 tons.
Three levels were set: (2000 tons). As is clear from Figures 5 and 6, even when the overall rolling load changes, the load received by the bearing located at the longitudinal center of the arbor is extremely large. It has been found that the lifespan of bearings located in the center is significantly degraded compared to bearings located outside the center of the direction. Therefore, if rolling is carried out continuously,
Only the bearing located in the center must be replaced frequently, and the line stoppage, labor, time, etc. that occur due to the replacement result in a very large loss.

Therefore, the present inventors conducted further studies.

Generally, the bearing dynamic load rating C is given by the following equation.

Here, f: Coefficient related to the pitch circle of the roller raceway Roller diameter i: Number of rows lo; Length of the roller (distance N between planes perpendicular to the center axis of the roller that are in contact with both end faces of the roller) Z: Roller The number of Dw S roller diameter and bearing life are given by the following formula.

n: Rotational speed C: Dynamic load rating P: Load acting on the bearing Therefore, from equations (1) and (2), the bearing life is The smaller the load P acting on the line, the longer it becomes.

By the way, in the crown adjustment roll shown in Fig. 1, the length of the bearing roller! . When the bearing outer ring width is changed, the contact condition with the work roll via the sleeve changes, and therefore the load P acting on each bearing changes.

In other words, if the length 111 of the rollers of the central bearing is increased, the load on the central bearing will also increase, but as a result of repeated studies, the inventors have determined the optimal value for the width of the outer ring of the bearing. It has been found that by selectively increasing the length of the rollers, it is possible to extend the life of the central bearing, and as a result, it is possible to equalize the life of multiple bearings.

In addition, if the dimensions of the inner and outer rings of the bearing are kept the same and the width of the outer ring of the bearing is increased, that is, the length of the rollers is increased, the life calculated by equation (2) will increase, but the rollers will not be able to withstand uneven loads. It was discovered that skew, which is tilted with respect to the normal rotation axis, is more likely to occur. In other words, since the skinny rollers cause abnormal rotation of the bearing, it was discovered that there is an appropriate range for the outer ring width, and that the value must be within this range.

In this way, as a result of repeated studies to solve the above-mentioned problems, the present inventor proposed the dimensions of a bearing to be incorporated into a crown adjustment roll as proposed in Japanese Patent Application Laid-Open No. 63-273504 or Japanese Patent Application No. 63-275108. The present invention was completed based on the knowledge that by limiting the range to a certain range, the lifespan of each bearing can be made generally uniform, and the above problems can be solved.

Here, the gist of the present invention is to provide a plurality of bearings each comprising a straight taper, an inner ring with a tapered wall thickness, and an outer ring of equal thickness, and the inner ring is fixed to the taper;
A crown adjusting roll comprising a taper angle adjusting device attached to an end of the taper, wherein an outer ring width Wc of a bearing located at the longitudinal center of the taper satisfies the following formula.

1.15W≦WC≦2.26x(d e-d 1)/2
Here, W=Σ Wi/n where n: Number of bearings Wi: Outer ring width of each bearing (m+g) (i=1...
・tn) do: Bearing outer diameter (mm) dl: Bearing inner diameter (-) Furthermore, the crown adjustment roll according to the present invention described above is
Furthermore, it is preferable that a cylindrical sleeve is loosely fitted over the entire outer ring.

In addition, from another aspect, the present invention includes a curved taper, a plurality of bearings each having an inner ring and an outer ring of equal thickness, the inner rings being fixed to the taper, and a taper angle adjusting device attached to an end of the taper. A crown adjusting roll comprising: an outer ring width WC of a bearing located at the longitudinal center of the taper, which satisfies the following formula.

1.15W≦Wc≦2.26X(do-d1)/2 where W is Σ Wi/n where n: Number of bearings Wi: Outer ring width of each bearing (IIIll) (+=1.
...+n) do: Bearing outer diameter (llIm) d: Bearing inner diameter (wm).

Furthermore, the crown adjustment roll according to the present invention described above,
Furthermore, it is preferable that a cylindrical sleeve is loosely fitted over the entire outer ring.

From another aspect, the present invention includes a straight arbor, a plurality of pushers fitted and fixed to the arbor, a plurality of rolling bearings having inner rings fitted and fixed to the pushes, and an outer ring of the rolling bearings. A roll comprising a cylindrical sleeve loosely fitted into the cylindrical sleeve, means for receiving thrust force acting on the cylindrical sleeve at both ends of the cylindrical sleeve, and an inclined spacer inserted into at least one gap between the bearings, The inner and outer circles of the central push are eccentric to each other, and the center axes of the inner and outer circles of the push are parallel to each other, and the other pushes are eccentric to each other. The circle and the outer circumferential circle are eccentric to each other at both ends of each push, and the other end on the axial extension of the maximum thickness part at one end is thinner than the maximum thickness part, and the vertical cross section at the center of the roll is A crown adjustment roll whose vF characteristic is that it is fitted into the arbor symmetrically around the center,
The crown adjustment roll is characterized in that the outer ring width Wc of the bearing located at the longitudinal center of the arbor satisfies the following formula.

1.15W≦Wc≦2.26×(d0-d 1)/2 where W=Σ Wi/n where n: Number of bearings Wi: Outer ring width of each bearing (n+m) (1=1...
・+n) d,: Bearing outer diameter (mm) d, j Bearing inner diameter (-) (Function) As mentioned above, the crown adjustment roll according to the present invention is disclosed in Japanese Patent Application Laid-Open No. 63-273504 or Japanese Patent Application No. 1983
This method is characterized in that the dimensions of the bearing incorporated in the crown adjustment roll proposed in No. 275108 are limited to a certain range. Therefore, first of all, Japanese Patent Application Laid-Open No. 63-273504 or Japanese Patent Application No. 63-27
The crown adjustment roll proposed in No. 5108 will be briefly explained.

In the crown adjustment roll of the present invention, the outer ring of the bearing tilted and fixed to the arbor functions as a rotating sleeve. Although not shown in FIG. 1, an arbor angle adjusting device (normally used for presetting) provided at the journal end of the Taber shaft 11 is an inexpensive arbor angle adjusting device consisting of a worm wheel, a worm, and a drive device for the worm. ) to change the roll crown by changing the angle of rotation of the arbor.

To further smooth the crown, a cylindrical sleeve 10 may be fitted loosely over the outer ring of the bearing, as shown in FIG.

In the present invention, at least one backup roll is introduced into a vertical roll arrangement type multi-stage rolling mill (if the roll in direct contact with the rolled material is the work roll, all rolls other than the work roll are the backup rolls), Control the shape and profile by combining with an existing roll bender. Alternatively, in the 2Hi mill, it is introduced as a work roll.

In the roll of the present invention, which will be described in detail below, a large amount of roll crown can be obtained.For example, in a roll with a diameter of 1500 m+a, a roll crown amount of +1.0 to -1.0 (mm) can be easily obtained. That of VC role is 0.2~0
．． 4 (mm/radius), the amount of change is 4 to 5 times greater.

Bankano roll of vertically arranged multi-stage rolling mill;
Alternatively, at least one crown adjustment roll of the present invention may be introduced in accordance with the work row, and the angle of this roll in the arbor circumferential direction may be adjusted to adjust the outer diameter generatrix of the sleeve to any crown within the range of concave crown to convex crown. The rolling material is combined with a roll bender, and the shape and/or profile of the rolled material is controlled in accordance with signals from the detector.

In the present invention, in the crown adjustment roll proposed in Japanese Patent Application Laid-Open No. 63-273504 or Japanese Patent Application No. 63-275108, the outer ring width Wc of the bearing located at the longitudinal center of the arbor is set to 1.15W.
≦Wc≦2.26 :Limited to bearing inner diameter. The reason for this is that if -6 is less than 1.1511, the life extension effect of the bearing located at the longitudinal center of the arbor will not be recognized;
This is because if it exceeds 2, roller skew tends to occur due to unbalanced loads as described above.

By limiting in this way, it is possible to prevent the occurrence of skew of the rollers due to unbalanced loads, and to make the life of each bearing extremely uniform over all bearings. therefore,
The timing for replacing each bearing can be centralized, and the frequency of bearing removal and installation operations can be significantly reduced.

Further, the present invention will be described in detail using Examples, but these are merely illustrative of the present invention and are not intended to limit the present invention.

Example A first example of the structure of the crown adjustment roll according to the present invention is shown below.
In the crown adjustment roll shown in FIG. 1, the bearings 1 to 5 are fitted onto the arbor 11 at an angle. Inner ring 21-2
5 is fixed to the pushers 36 to 38 by shrink fitting, and the pushers 36 to 38 are further fixed to the arbor 11 by shrink fitting. The load is transmitted from the work roll or intermediate roll, and the outer rings 31 to 3 of bearings 1 to 5 rotate during rolling.
It is 35. During rolling, the arbor 11 does not rotate and the outer ring 31
~35 only rotate.

The inclination angle of the inner rings 21 to 25 with respect to the Taber shaft 11 is α,
The width of the sloped part! Then, the crown amount δ=2·α. If there is a work roll above FIG. 1, there will be a convex crown δ, and if the arbor 11 is rotated by 180@, -
The crown amount is δ. Therefore, the roll crown can be adjusted within the range of 2δ from +δ to −δ by adjusting the circumferential angle of the arbor 11.

However, if the outer rings 31 to 35 are brought into direct contact with the work roll, the gloss and wear condition of the work roll will not be uniform, and the surface quality and gloss may become partially insufficient.

Therefore, it is preferable to insert the cylindrical sleeve 10 outside the bearings 1 to 5. When the rolling load is transmitted from the work roll, the cylindrical sleeve 10 is elastically deformed and comes into contact with the bearing outer rings 31 to 35 at the position where it contacts the work roll, and the cylindrical sleeve 10 rotates together with them. Therefore, as described above, a roll crown from +δ to -δ is obtained. Furthermore, since the work roll and the cylindrical sleeve are in full contact with each other, gloss and uneven wear of the work roll are eliminated.

Although the crown adjustment roll shown in FIG. 1 has been described using a straight Taber shaft 11, the present invention is not limited to this embodiment.

For example, as described in Japanese Unexamined Patent Publication No. 63-273504, the arbor may have a structure in which blood is removed in the axial direction or in a bent structure.

Then, the crown adjustment roll shown in FIG. 1 was incorporated into the 4th mill as a backup roll and rolling was carried out continuously. The dimensions of this crown adjustment roll are shown in Table 1, and the rolling load occurrence frequency conditions are shown in FIG. 2. In FIG. 2, the height of the bar graph indicates the occurrence frequency of the rolling load value.

Table 1 (mm) Figure 3 shows the results of rolling and determining the life of each bearing. The bearing life was determined by X-ray analysis of the inner raceway surface.

In roll size 4, in which the outer ring widths of the five bearings assembled in the roll are all the same width, the life of the center bearing is extremely short, being about 173 times longer than the life of the end bearings.

Furthermore, it has been found that in the case of the roll block 5 in which the outer ring width is wider than the range of the present invention, skew occurs in the rollers of the central bearing, resulting in a longer (reduced) life.

On the other hand, in the example of the present invention, roll Nα1, roll N
For α2 and roll Nα3, the lifespan of each bearing was within ±18% of the average lifespan of all bearings, and the lives were averaged. That is, by increasing the width of the outer ring of the central bearing and lengthening the length of the rollers, the life of the central bearing is improved.

In this embodiment, a crown adjustment roll incorporating five bearings has been explained as an example, but it goes without saying that the same effect can be achieved even when the number of bearings is, for example, three or seven. , Furthermore, in this embodiment, bearing 1 in the center is
All the outer ring widths other than the above are set to be the same width, but of course they may be different widths and there is no need for any restriction.

(Effects of the Invention) According to the present invention, it is possible to equalize the lifespan of a plurality of bearings, and it is possible to reduce the frequency of bearing replacement. This not only shortens line downtime, but also significantly reduces the time required for roll maintenance, resulting in significant cost rationalization.

The significance of the present invention having such effects is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing the crown adjustment roll according to the present invention; FIG. 2 is a graph showing the rolling frequency in the example; FIG. 3 is a graph showing the results of the example; FIG. A schematic sectional view showing the crown adjustment roll proposed in JP-A No. 63-273504; FIG.
A graph showing the magnitude of the load that each bearing receives when rolling is performed using the crown adjustment roll proposed in JP-A No. 273504; and FIG. It is a graph showing the magnitude of the load that each roller receives when rolling is performed using adjustment rolls.

Claims (1)

[Scope of Claims] (1) A plurality of bearings consisting of a straight arbor, a tapered inner ring with a thick wall, and an outer ring of equal thickness, the inner ring being fixed to the arbor, and a plurality of bearings attached to the ends of the arbor. A crown adjusting roll equipped with an arbor angle adjusting device, characterized in that an outer ring width Wc of a bearing located at the longitudinal center of the arbor satisfies the following formula. 1.15W≦Wc≦2.26×(d_0−d_1)/2
Here, W = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ However, n: Number of bearings Wi: Outer ring width of each bearing (mm) (i = 1, ..., n) d_0: Bearing outer diameter (mm) d_1: Bearing inner diameter (mm) (2) The crown adjustment roll according to claim 1, wherein the crown adjustment roll further includes a cylindrical sleeve loosely fitted over the entire outer ring. (3) a curved arbor, and a plurality of bearings consisting of an inner ring and an outer ring of equal thickness, the inner rings being fixed to the arbor;
A crown adjusting roll comprising an arbor angle adjusting device attached to an end of the arbor, wherein an outer ring width Wc of a bearing located at the longitudinal center of the arbor satisfies the following formula. 1.15W≦Wc≦2.26×(d_0−d_1)/2
Here, W = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ However, n: Number of bearings Wi: Outer ring width of each bearing (mm) (i = 1, ..., n) d_0: Bearing outer diameter (mm) d_1: Bearing inner diameter (mm) (4) The crown adjustment roll according to claim 3, wherein the crown adjustment roll further includes a cylindrical sleeve loosely fitted over the entire outer ring. (5) A straight arbor, a plurality of pushers fitted and fixed to the arbor, a plurality of rolling bearings whose inner rings are fitted and fixed to the pushers, and a cylindrical sleeve loosely fitted to the outer ring of the rolling bearing. a means for receiving a thrust force acting on the cylindrical sleeve at both ends of the cylindrical sleeve; and an inclined spacer inserted into at least one gap between the bearings, the roll comprising: The inner and outer circles of the push are eccentric to each other, and the central axes of the inner and outer circles of the push are parallel to each other.For other pushes, the inner and outer circles are eccentric. Both ends of each push are eccentric to each other, and the other end on the axial extension line of the maximum thickness part at one end is thinner than the maximum thickness part, and further symmetrically centered on the vertical cross section of the center of the roll. A crown adjusting roll fitted to an arbor, wherein an outer ring width Wc of a bearing located at the longitudinal center of the arbor satisfies the following formula. 1.15W≦Wc≦2.26×(d_0−d_1)/2
Here, W = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ However, n: Number of bearings Wi: Outer ring width of each bearing (mm) (i = 1, ..., n) d_0: Bearing outer diameter (mm) d_1: Bearing inner diameter (mm)