JP2001252707A - Rolling device and rolling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling device and rolling method for effectively compensating the deformation of a roll due to temperature distribution. SOLUTION: This device is provided with a cooling water header 3 for performing spray cooling to the surface of the part where a material W to be rolled is passed through a work roll 1 with cooling water 5 jetted from spray nozzles 4 and shielding walls 10 which are provided on the surface of the work roll in the side of the end parts of the material to be rolled and with which the infiltration of the cooling water 5 to non-cooling local of the surface of the work roll is prevented and fluid jet streams are spouted out in a film like state in the direction of roll width from the side wall 10b of the shielding walls 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rolling apparatus and a rolling method, and more particularly to a rolling apparatus and a rolling method for correcting a thermal crown of a rolling roll while rolling a material to be rolled.

[0002]

2. Description of the Related Art In hot rolling of a material to be rolled such as a metal plate or a metal strip, when a material to be rolled having the same width is continuously rolled,
Since the work roll and other rolling rolls are heated and heat is conducted toward the end of the roll at the end of the roll, the temperature at the end of the roll is lower than the temperature at the center of the roll. In other words, a non-uniform plate thickness is formed by a phenomenon called a thermal crown in which the rolling roll becomes smaller (narrower) toward the end of the material to be rolled, which is a problem in quality.

As a solution to this phenomenon, Japanese Patent Application Laid-Open No. Hei 9-85312 discloses a method of actively cooling a threaded portion of a rolling roll. This is because, as shown in FIG. 9, when spraying the cooling water 101 a toward the surface of the rolling roll 100 from the spray nozzles 101 arranged in a row in the roll axis direction of the rolling roll 100, the spraying range thereof is The number of the spray nozzles 101 for injecting the cooling water 101a is limited by controlling the respective electromagnetic valves so that the number of the spray nozzles 101 for injecting the cooling water 101a is limited so as to be equivalent to the plate width of the material W (passing portion).
The position of a pair of left and right partition plates 103 movable in the roll axis direction by the actuator 102 is controlled.

Further, Japanese Patent Publication No. 7-8370 discloses a method of positively heating a non-sheet passing portion of a rolling roll. This is because, as shown in FIG. 10, the pair of left and right side guides 106 is moved by the side guide width adjusting device 105 in accordance with the plate width of the material W to be rolled, and the threaded portion thermally expands by hot rolling. A steam jet 107 is applied to the non-sheet passing portion of the rolling roll 100 by a spray nozzle 107 over a predetermined width.
a is sprayed and heated.

[0005]

However, in the above-mentioned method of actively cooling the threaded portion of the rolling roll,
Since the cooling area by the cooling water injection is limited only by the partition plate 103, the injected cooling water 101a is
In some cases, the portion that does not need to be cooled after passing through the rolls may be cooled, and the amount of thermal deformation caused by the temperature distribution associated with the heat conduction on the roll has not been sufficiently compensated.

Further, in the method of positively heating the non-threaded portion of the rolling roll 100, cooling is performed over the entire width of the rolling roll 100 after a half rotation of the rolling roll 100 after coming into contact with the material W to be rolled. , SteamJet 1 mentioned above
Since the heating part by 07a is also cooled, the amount of heating becomes excessive, and there is a problem that a heating device with a large output is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rolling apparatus and a rolling method capable of effectively compensating for roll deformation due to temperature distribution.

[0008]

According to the present invention, there is provided a rolling apparatus comprising: a cooling water header for spray cooling a surface of a rolling roll at a portion where a material to be rolled passes; And a shielding wall provided on one of the rolling roll surface portions and capable of preventing the cooling water from entering a non-cooling local portion of the rolling roll surface.

Further, the shielding wall has a vertical wall for limiting the spray cooling range and a horizontal wall extending in the roll width direction corresponding to a non-cooling local portion of the surface of the rolling roll.

[0010] Further, the shielding wall blows a fluid jet in a film shape in a roll width direction on the horizontal wall portion.

Further, the fluid jet is blown at an acute angle to the surface of the rolling roll.

Further, the shielding wall is movable in at least a roll width direction and a direction orthogonal to the roll width direction.

[0013] A local heating device for heating an uncooled local portion of the surface of the rolling roll is provided near the shielding wall.

According to the rolling method of the present invention for achieving the above object, the surface of the rolling roll where the material to be rolled passes is spray-cooled and provided on the surface of the rolling roll on the side of the end of the material to be rolled. The rolling is performed while preventing the cooling water from entering a non-cooling local portion of the surface of the rolling roll by a shielding wall.

[0015] Further, the invention is characterized in that rolling is performed while heating a non-cooled local portion of the surface of the rolling roll by a local heating device provided near the shielding wall.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rolling apparatus and a rolling method according to the present invention will be described in detail with reference to the drawings using embodiments.

[First Embodiment] FIG. 1 is a plan view of a rolling mill according to a first embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an enlarged side sectional view thereof, and FIG. 9 is a graph showing a comparison of the correction amounts of rolls that have caused the above.

As shown in FIGS. 1 and 2, a workpiece W such as a hot-rolled steel sheet is hot-rolled by upper and lower work rolls 1 and a backup roll 2.

A cooling water header 3 is disposed in parallel with the upper work roll 1, and cooling water (spray water) 5 sprayed from spray nozzles 4 attached in the longitudinal direction (roll axis direction) of the cooling water header 3 causes the upper work to be cooled. The portion to be heated by the material W to be rolled (rolling range E) of the roll 1 is cooled. The cooling water header 3 is similarly arranged for the lower work roll 1, but since the upper and lower work rolls 1 have the same configuration, the description of the lower work roll 1 will be omitted.

The cooling water header 3 is rotatably supported by header mounting portions 6 at both ends thereof, and each spray nozzle 4 attached to the cooling water header 3 is provided.
Is controlled on / off by a solenoid valve to cool only the passing area E of the material W to be rolled. A roll cooling water pipe 7 for supplying cooling water into the cooling water header 3 is connected to the header mounting portion 6.

The cooling water header 3 includes the cooling water 5.
A pair of right and left shielding walls 10 for blowing out a fluid jet 9 to block overflow water 8, which will be described later, is attached movably in the longitudinal direction (roll axis direction).

That is, the shielding wall moving device 11 for driving the shielding wall 10 is provided with a plurality of rollers 1 which can roll the header protrusion 3a protruding around the cooling water header 3 and on the roll side.
The cooling water header 3 is mounted on a slide box 13 provided with a cooling water header 2 and can be driven in a longitudinal direction by remote control. The slide box 13 is driven by a motor of the shielding wall moving device 11 and moves by receiving force transmitted by a rack and pinion.

Then, the shielding wall 1 is connected to the slide box 13 via a connecting rod 14 and a fine adjustment and expansion / contraction device 15.
0 is supported. Therefore, the header mounting portion 6 described above is used.
With this rotation (tilt), the slide box 13 also rotates integrally, whereby the shielding wall 10 is adjusted to the moving direction corresponding to the wear of the upper work roll 1 and the change in the thickness of the material W to be rolled. Further, by remotely controlling the fine adjustment and expansion / contraction device 15, it is possible to adjust the clearance between the shielding wall 10 and the work roll 1 and to displace the shield wall 10 in the plane perpendicular to the axis on the order of several tens of mm. In FIG. 2, reference numeral 16 denotes a bellows provided on a telescopic slide portion of the fine adjustment and telescopic device 15 for preventing dust adhesion.

As shown in FIG. 3, the shielding wall 10
It is formed in a box shape having a pair of left and right vertical walls 10a and a pair of upper and lower horizontal walls 10b, and inside the pair of upper and lower horizontal walls 10b, flat and flat fluid passages 17A and 17B are formed. Then, the fluid jets 8 are blown obliquely upward from the fluid passages 17A and 17B to the upper work roll 1 in the case of the fluid passage 17A and obliquely downward in the case of the fluid passage 17B at an acute angle θ. In addition, the above-mentioned overflow water 8 and cooling water 5 are prevented from flowing into a region of the work roll 1 that has not been heated by the material W to be rolled. 1 and 2, reference numeral 18 denotes the fluid passage 17;
A, a fluid conduit leading to a fluid supply source (not shown) to supply fluid to 17B.

From the left and right ends of the pair of upper and lower lateral walls 10b, the fluid jet 9 is supplied to the fluid passages 17A and 17B.
Guide vanes 20 accommodated together with a plurality of support pieces 19
(This may be formed integrally with the fluid passages 17A and 17B.) It is directed so as to be blown outward in the roll width direction of the upper work roll 1. In addition, the fluid jet 9
In particular, it need not be a liquid such as water, but may be a gas. Alternatively, a fibrous material may be stuck to the roll-facing end surfaces of the vertical wall 10a and the horizontal wall 10b, and this may be slid on the roll surface to assist in preventing inflow.

The shielding wall 10 extends from the side end of the material to be rolled W outward in the roll width direction by 5 mm to 70 mm, preferably 1 mm.
It is provided as close as possible to about 0 mm, and is provided at a distance of 2 mm to 10 mm, preferably about 3 mm from the roll surface in the roll radial direction.

The shield wall 10 is arranged in the roll circumferential direction on the plate exit side of the upper work roll 1 and the fluid jet 9 is arranged so as to cover substantially the entire exposed surface of the roll. Although not shown, a tray for collecting the cooling water 5 from each spray nozzle 4 is disposed directly above the material W to be rolled on the plate exit side of the upper work roll 1.

With this configuration, during hot rolling, the cooling water 5 injected from the spray nozzle 4 of the cooling water header 3 to the upper work roll 1 rides on the rotation of the upper work roll 1. It moves to the upper part and becomes overflow water 8 and flows outward in the roll width direction.

At this time, in the conventional apparatus, the upper work roll 1
Because the falling force of the overflow water 8 cannot be prevented only by the turning force of
It also flows down to a portion other than the region heated by the material W to be rolled of the upper work roll 1, causing a problem that the region not actively cooled is cooled. The cooling water 5 injected into the upper work roll 1 contains the upper work roll 1.
Some of them may flow down without rotating, and there is a risk that they may enter the area where cooling is not desired.

However, in the present embodiment, the shielding wall 10
Of the fluid jet 9 obliquely upward from the fluid passage 17A,
A fluid jet 9 is blown obliquely downward from the fluid passage 17B in a film-like manner and at an acute angle θ.

Thus, the overflow water 8 flows outward between the upper work roll 1 and the upper backup roll 2 without flowing down to the upstream side of the roll rotation by the fluid jet 9 from the fluid passage 17A. Go. On the other hand, the fluid jet 9 from the fluid passage 17B also prevents the cooling water 5 flowing down without riding on the rotation of the upper work roll 1 from entering the region where cooling is not desired.

As a result, a wide dry roll surface can be ensured, and the cooling region is limited to cool only the region heated by the material to be rolled W. Therefore, the effect of correcting the thermal crown of the upper work roll 1 can be reduced. Can be improved.

FIG. 4 shows the rolling method of the present embodiment as a thermal crown correction behavior of a work roll during steel plate rolling. Curve A shows the change in the outer surface of the roll due to the thermal crown. When this roll is provided with only a partition plate, the curve is shown by a curve D. Next, a curve B shows the result of correction by providing the shielding wall 10 having the fluid jet mechanism, which is the rolling method of the present embodiment. From this, it can be seen that the correction of the thermal crown is sufficiently improved as compared with the conventional method.

In the above embodiment, the effect of correcting the thermal crown is further improved by controlling the opening amount of the spray nozzle 4 by using an electromagnetic valve so as to reduce the amount of cooling water near the width end of the material W to be rolled. Can be better.

[Second Embodiment] FIG. 5 is a plan view of a rolling mill according to a second embodiment of the present invention, FIG. 6 is a side view thereof, FIG. 9 is a graph showing a comparison of the correction amounts of rolls that have caused the above.

As shown in FIGS. 5 to 7, this embodiment is an example in which a local heating device 30 of an induction heating system is integrally housed inside a pair of left and right shielding walls 10 in the first embodiment. . And this local heating device 30
From the side end of the roll to the outside in the roll width direction by about 10 mm to 70 mm, preferably about 50 mm.

Although not shown, the power supply of the local heating device 30 is set to 40 KH in view of ease of output and penetration depth of generated heat.
60KH from _{Z Z} C., preferably a high frequency power source 50KH _Z, conductors are to hard structure resulting leakage currents and electromagnetic sealing and water-cooled conduit 31.

The local heating device 30 has a circumferential angle range of about 200 mm in circumferential length and 100 mm in axial direction.
The surface of the roll can be heated strongly by the induced current and the inside of the roll can be heated weakly. Thereby, the temperature distribution of the roll material heated by the local heating device 30 is considered to be equal to the temperature distribution heated by the rolling of the material W to be rolled.

According to this embodiment, the synergistic effect of the shielding wall 10 having the fluid jet mechanism and the local heating device 30, that is, the region other than the region heated by the material W to be rolled,
While the positive cooling effect of the cooling water 5 is avoided, the heating is effectively performed by the local heating device 30, and the effect of correcting the thermal crown of the upper work roll 1 can be further improved.

FIG. 8 shows the rolling method of the present embodiment as the thermal crown correction behavior of the work roll during the rolling of the steel sheet. Curve A shows the change in the outer surface of the roll due to the thermal crown. This roll is provided with a shielding wall 10 having a fluid jet mechanism, and about 130 KW outside by about 50 mm from the end of the rolled steel sheet by a local heating device 30.
Curve B shows the result corrected by heating with the output of. Curve D shows the result of correction with the same input power when no fluid jet mechanism was provided. From this, it can be seen that the thermal crown can be corrected with a low output. It has been calculated that 230 KW is required to achieve the same effect.

The present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0042]

As described above in detail, the rolling apparatus according to the first aspect of the present invention comprises: a cooling water header for spray-cooling a roll surface of a portion where a material to be rolled passes; And a shielding wall provided on the surface of the rolling roll on the side of the end to prevent the cooling water from entering the uncooled local portion of the surface of the rolling roll. A wide area can be secured and the cooling area is limited to cool only the area heated by the material to be rolled, so that the effect of correcting the thermal crown of the rolling roll can be improved, and high flatness rolling can be performed.

According to a second aspect of the present invention, in the rolling apparatus, the shielding wall includes a vertical wall for limiting the spray cooling range and a horizontal wall extending in the roll width direction corresponding to a non-cooling local portion of the rolling roll surface. Therefore, the effect of claim 1 can be obtained with a simple shielding wall structure.

The rolling device according to claim 3 of the present invention is characterized in that the shielding wall blows out a fluid jet in the form of a film in the roll width direction on the side wall portion, so that the rolling jet is more reliably performed by the fluid jet. It is possible to prevent the cooling water from entering the uncooled local portion of the roll surface.

The rolling apparatus according to claim 4 of the present invention is characterized in that the fluid jet is blown at an acute angle with respect to the surface of the rolling roll, so that the range of the fluid jet is extended in the roll circumferential direction. It is expanded to.

In a rolling apparatus according to a fifth aspect of the present invention, the shielding wall is movable in at least a roll width direction and a direction orthogonal to the roll width direction.
The shielding wall can be easily adjusted in the moving direction corresponding to the change in the width of the material to be rolled, the abrasion of the rolling roll, and the change in the thickness of the material to be rolled.

The rolling device according to claim 6 of the present invention is characterized in that a local heating device for heating an uncooled local portion of the surface of the rolling roll is provided close to the shielding wall. The effect of correcting the thermal crown of the rolling roll can be further improved by the synergistic effect of (1).

In the rolling method according to a seventh aspect of the present invention, the surface of the rolling roll through which the material to be rolled passes is spray-cooled, and the shield provided on the surface of the rolling roll on the side of the end of the material to be rolled. Rolling is performed while preventing infiltration of the cooling water into the uncooled local portion of the surface of the rolling roll by a wall, so that a dry roll surface can be widely secured, and a cooling area is limited to heat the rolled material. Only the reduced area is cooled, the effect of correcting the thermal crown of the rolling roll can be improved, and rolling with high flatness can be performed.

The rolling method according to claim 8 of the present invention is characterized in that rolling is performed while heating an uncooled local portion of the surface of the rolling roll by a local heating device provided near the shielding wall. The synergistic effect with the shielding wall can further improve the effect of correcting the thermal crown of the rolling roll.

[Brief description of the drawings]

FIG. 1 is a plan view of a rolling apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged side sectional view of a main part of the same.

FIG. 4 is a graph showing a comparison of correction amounts of rolls having a thermal crown.

FIG. 5 is a plan view of a rolling apparatus according to a second embodiment of the present invention.

FIG. 6 is a side view of the same.

FIG. 7 is an enlarged side sectional view of a main part of the same.

FIG. 8 is a graph showing a comparison of the correction amounts of rolls having a thermal crown.

FIG. 9 is a front view of a conventional rolling device.

FIG. 10 is a plan view of a different conventional rolling device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work roll 2 backup roll 3 cooling water header 4 spray nozzle 5 cooling water 6 header mounting part 7 roll cooling water pipe 8 overflow water 9 fluid jet 10 shielding wall 11 shielding wall moving device 12 roller 13 slide box 14 connecting rod 15 fine adjustment and Telescopic device 16 Bellows 17A, 17B Fluid passage 18 Fluid conduit 19 Support piece 20 Guide vane 30 Local heating device 31 Water cooling conduit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Matsuoka 4-6-22 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Kanji Hayashi 4-chome, Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima No. 6-22 Inside the Mitsubishi Heavy Industries, Ltd.Hiroshima Plant (72) Inventor Kazuo Morimoto 4-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Inside Mitsubishi Heavy Industries, Ltd.Hiroshima Research Institute (72) Inventor Yuji Asahara Nishi-ku, Hiroshima City, Hiroshima Prefecture 4-62 Kannon Shinmachi, Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Kazumasa Mihara 4-2-2 Kanon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd.Hiroshima Works (72) Inventor Keiji Mizuta F-term (reference) 4H024 in Hiroshima Works, Mitsubishi Heavy Industries, Ltd. 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima AA02 AA03 DD04

Claims (8)

[Claims] 1. A cooling water header for spray cooling a surface of a rolling roll where a material to be rolled passes, and a non-cooling local portion of the surface of the rolling roll which is provided on a surface of the rolling roll on the side of the end of the material to be rolled. And a shielding wall capable of preventing the cooling water from entering the rolling mill. 2. The screen according to claim 1, wherein the shielding wall has a vertical wall for limiting a range of the spray cooling and a horizontal wall extending in a roll width direction corresponding to a non-cooling local portion of the surface of the rolling roll. A rolling device as described. 3. The rolling device according to claim 2, wherein the shielding wall blows out a fluid jet in a film shape in a roll width direction on the lateral wall portion. 4. The method according to claim 3, wherein the fluid jet is blown at an acute angle to the surface of the roll.
A rolling device as described. 5. The rolling device according to claim 1, wherein the shielding wall is movable at least in a roll width direction and a direction orthogonal to the roll width direction. 6. The rolling device according to claim 1, further comprising a local heating device for heating a non-cooled local portion of the surface of the rolling roll in proximity to the shielding wall. 7. A rolling roll surface at a portion where a material to be rolled passes is spray-cooled, and a non-cooling local portion of the surface of the rolling roll is provided by a shielding wall provided on a surface of the rolling roll on the side of the material to be rolled. Rolling while preventing the cooling water from entering the rolling method. 8. The rolling method according to claim 7, wherein the rolling is performed while heating an uncooled local portion of the surface of the rolling roll by a local heating device provided near the shielding wall.