JP5773789B2 - Multi-stage rolling mill - Google Patents

Description

The present invention relates to a multi-high rolling mill used for rolling a thin plate.

As is well known, a multi-stage rolling mill is used when cold rolling a rolled material such as stainless steel, titanium, special steel, or copper. As a multi-high rolling mill, a “cluster type multi-high rolling mill” is generally used in which a group of rolls that support a work roll spreads in a fan-like manner.
In such a cluster type multi-high rolling mill, for example, if a 12-high rolling mill is taken as an example, an intermediate roll is placed up and down so as to come into contact with the work roll outside the pair of upper and lower work rolls for rolling the rolled material. A total of four are deployed, two each. Then, outside these intermediate rolls, six backup rolls are arranged in total, three in the vertical direction so as to come into contact with the intermediate rolls.

  In rolling a thin plate using such a multi-stage rolling mill, a good flat shape is required, and an acoustic wave such as simple middle elongation is corrected by a mechanical control means such as roll bending or a shift mechanism, The compound elongation such as quarter elongation is corrected by controlling the thermal crown with spot coolant. In addition, measures are taken to prevent plate breakage by extending the end in the plate width direction by these shape control means to create an ear wave.

  For example, Patent Document 1 discloses a method of measuring the shape of a work roll and changing the roll crown of the work roll based on the measured shape of the work roll. Patent Document 2 discloses a method of measuring the shape of a rolled material, not the shape of the work roll, and changing the roll crown of the work roll based on the measured shape of the rolled material. The methods described in these documents change the roll crown by directly injecting cooling water or coolant to the work roll. In this document, a plurality of methods are provided along the axial direction of the rolling roll. A roll cooling device that supplies cooling water or coolant to an arbitrary place on a work roll is disclosed.

  In Patent Document 3, oil set to a temperature higher than the temperature of the work roll is injected to the end of the work roll, and oil set to a temperature lower than the temperature of the work roll is injected to the center of the work roll. A shape control means for preventing excessive generation of an acoustic wave in the rolled material by causing the roll crown of the work roll to be further greatly changed by caulking is disclosed.

JP-A-55-42161 JP 2004-66310 A JP-A-3-297507

  By the way, in the multi-high rolling mill, a plurality of intermediate rolls, backup rolls and the like having a larger diameter than the work roll are provided outside the small-diameter work roll, and a space in which the roll cooling device and the shape detector described above can be installed. However, it is often impossible to secure around the work roll. In particular, in multi-stage rolling mills equipped with strip guides that perform functions such as rolling material rolling prevention, thread guide, roll coolant injection, etc., there may be no installation space around the work roll due to the strip guide being in the way. Many.

Moreover, in the multistage rolling mill of patent documents 1-3, since it has the structure which controls the shape of a rolling material by adjusting the temperature of work roll itself, the heated work roll is directly on the surface of a rolling material. It comes in contact, and gloss unevenness is likely to occur in the rolled material.
Furthermore, a large amount of work roll lubricating oil or the like is supplied to the surface of the work roll in contact with the rolled material. Therefore, even if heated or cooled oil is supplied around the work roll where there is a large amount of lubricating oil, the oil and lubricating oil are mixed together, and heating and cooling effects on the work roll are obtained. There was also a problem that it was difficult to get.

The present invention has been made in view of the above problems, and is a multi-stage rolling mill capable of greatly changing the roll crown of a work roll without being restricted by installation space or causing uneven gloss. The purpose is to provide.

In order to achieve the above object, the shape control method of the multi-high rolling mill according to the present invention employs the following technical means.
That is, the shape control method for a multi-high rolling mill according to the present invention provides the support for the multi-high rolling mill in which a support roll for supporting the work roll is provided outside the pair of upper and lower work rolls for rolling the rolled material. By heating the roll locally, the roll crown of the work roll contacting the support roll is changed, and the rolling shape of the rolled material rolled between the work rolls is controlled.

Further, the multi-high rolling mill according to the present invention is a multi-high rolling mill in which a support roll for supporting the work roll is arranged outside the pair of upper and lower work rolls for rolling the rolled material,
In order to change the roll crown of the work roll in contact with the support roll, a heating means for locally heating the support roll is provided.

  If the inventor locally heats or cools a roll other than the work roll (support roll such as an intermediate roll or a backup roll) instead of the work roll, the installation space is less restricted and the roll is contacted. It was thought that the occurrence of uneven gloss could be suppressed by eliminating the temperature difference on the roll surface. And it was found that the roll crown of the work roll can be changed more greatly when the support roll having a larger diameter is used than when the work roll is used, and the rolling shape of the rolled material can be controlled better. Thus, the present invention has been completed.

  In addition, it is preferable that the said heating means is arrange | positioned along the axial center direction of the said support roll. Further, as such a heating means, there are provided an induction coil for generating an induction current on the surface of the support roll, and a coolant injection means for injecting a temperature-controlled coolant on the surface of the support roll. Or a device provided with air injection means for injecting temperature-adjusted air onto the surface of the support roll.

  The multi-stage rolling mill of the present invention includes not only a cluster type but also a vertical type. For example, when an intermediate roll that contacts the work roll is provided outside the work roll and a backup roll is provided outside the intermediate roll so as to contact the intermediate roll, An intermediate roll and / or a backup roll may be the support roll.

Further, when a backup roll that supports the work roll is provided outside the work roll as in a four-stage vertical rolling mill that does not include an intermediate roll, the backup roll is supported by the support roll. It may be a roll.
Moreover, the most preferable form of the multi-high rolling mill according to the present invention is provided with two intermediate rolls in contact with the work rolls on the outer sides of the pair of upper and lower work rolls for rolling the rolled material. on the outside of the roll, a larger diameter than the intermediate rolls, a multi-high rolling mill in which three of the backup roll to be in contact with the intermediate roll is deployed, the work rolls in contact with the intermediate rolls In order to change the roll crown, heating means for locally heating the intermediate roll through the rolling material side of the backup roll and facing the outer peripheral surface of the intermediate roll is provided in the axial direction of the intermediate roll. It is characterized by being provided along.
Preferably, the heating means includes an induction coil that generates an induced current on the surface of the intermediate roll.
In addition, Preferably, the said heating means is good to provide the coolant injection means which injects the coolant of which temperature was adjusted to the surface of the said intermediate | middle roll.
In addition, Preferably, the said heating means is good to provide the gas injection means which injects the gas by which temperature adjustment was carried out on the surface of the said intermediate | middle roll.

According to the multi-high rolling mill of the present invention, the roll crown of the work roll can be greatly changed without being restricted by the installation space or causing uneven gloss.

It is a front view of the multi-high rolling mill of the present invention. It is a front view which shows the shape control means of 1st Embodiment. It is a perspective view which shows arrangement | positioning of the shape control means of 1st Embodiment. It is a side view of the multistage rolling mill of 1st Embodiment. It is a front view which shows the shape control means of 2nd Embodiment. It is a perspective view which shows arrangement | positioning of the shape control means of 2nd Embodiment. It is a front view which shows the shape control means of 3rd Embodiment. It is a perspective view which shows arrangement | positioning of the shape control means of 3rd Embodiment. It is a perspective view which shows arrangement | positioning of the shape control means of 4th Embodiment. (A) is a rolling shape when the shape control method of the present invention is performed, and (b) is a rolling shape when the conventional shape control method is performed. (A) is a front view which shows the shape control means provided in the backup roll of the conventional multi-high rolling mill, (b) is a figure which shows the shape control method performed using the conventional shape control means. Moreover, (c) is a figure which shows the shape control means of 5th Embodiment of this invention.

“First Embodiment”
Hereinafter, the shape control method of the multi-high mill 1 and the embodiment of the multi-high mill 1 according to the present invention will be described with reference to the drawings. First, the multi-stage rolling mill 1 of the present invention will be described by taking a cluster-type multi-high rolling mill to which the shape control method of the present invention is applied as an example.
As shown in FIG. 1, the multi-high rolling mill 1 includes a plurality of work rolls 2, intermediate rolls 3, and backup rolls 4 (hereinafter, the intermediate rolls 3 and backup rolls 4 are collectively referred to as support rolls 12 in the present embodiment). It is composed of this combination, and a combination of a plurality of rolls looks just like a bunch of straw and is called a cluster type multi-high rolling mill. The illustrated multi-high rolling mill 1 has a 12-stage configuration of two work rolls 2, four intermediate rolls 3, and six backup rolls 4, and is horizontally spanned with stainless steel, titanium, and special rolls. It is used when rolling (particularly cold rolling) a plate-like rolled material W made of steel, copper or the like.

  In addition, let the upper and lower sides on the paper surface of FIG. 1 be the upper and lower sides when describing the multi-high rolling mill 1. Moreover, the left and right on the paper surface of FIG. 1 are the left and right when the multi-high rolling mill 1 is described. Moreover, let the paper surface penetration direction of FIG. 1 be the width direction at the time of explaining the multistage rolling mill 1. FIG. These directions coincide with the directions when the multi-high rolling mill 1 is viewed from the drive side (drive side). Moreover, in the following description, the same code | symbol is attached | subjected to the same components. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

First, various rolls constituting the multi-high rolling mill 1 will be described.
As shown in FIG. 1, the work roll 2 is a roll having a smaller diameter than other rolls, and is formed to have a diameter of about 20 to 100 mmφ in the case of equipment for cold rolling a stainless rolled material W. Yes. The work roll 2 is composed of a pair of upper and lower sides, and is arranged so that a rolling load can be applied to the rolled material W while sandwiching the rolled material W between the upper and lower rolls.

Next, the support roll 12 that supports the work roll 2 will be described.
The support roll 12 of this embodiment is provided outside the work roll 2 and is in contact with the work roll 2. The backup roll 4 is provided outside the intermediate roll 3 and is in contact with the intermediate roll 3. have.
The intermediate rolls 3 are arranged on the outer sides of the respective work rolls 2 (in the case of the upper work roll 2, the upper side of the upper work roll 2, and in the case of the lower work roll 2, the lower work roll 2 Furthermore, two rolls are provided for each work roll at a distance in the horizontal direction. The intermediate roll 3 is a roll having a diameter larger than that of the work roll 2, and is arranged such that the outer peripheral surface is in contact with the outer peripheral surface of the work roll 2. In the illustrated example, the upper intermediate roll 3 is brought into contact with the outer peripheral surface of the upper work roll 2, and the lower intermediate roll 3 is brought into contact with the outer peripheral surface of the lower work roll 2. It is deployed in contact. These intermediate rolls 3 are connected to a universal spindle (not shown) at their shaft ends, and are configured to rotate by being transmitted with a driving force generated by a motor via the universal spindle.

  The backup roll 4 is a roll provided outside each intermediate roll 3, and all of them are formed to have a larger diameter than the intermediate roll 3. These backup rolls 4 are arranged at a distance from each other in the horizontal direction. The backup rolls 4 are arranged such that their outer peripheral surfaces are in contact with the outer peripheral surface of the intermediate roll 3 and can be supported while pressing the intermediate roll 3 from the outside. It has a configuration.

  The strip guide 5 is a plate-like member that plays a role of preventing rolling of the rolled material W, passing plate guides, and roll coolant spraying, and is disposed on the upper side and the lower side of the rolled material W that is horizontally stretched. ing. The strip guide 5 is provided in the horizontal direction so as to be spaced apart from the rolled material W in the vertical direction and along the rolled material W. These strip guides 5 have a width substantially equal to the rolled material W in the width direction. The strip guide 5 is provided on each of the left side (upstream side) and the right side (downstream side) of the work roll 2, and the work roll 2 rolls a part of the outer peripheral surface between the left and right strip guides 5. It protrudes toward the material W side.

  By the way, the multistage rolling mill 1 is provided with a shape control means 6 for correcting a shape defect such as quarter elongation in the rolled material W. Such shape control means 6 is configured to control the shape of the rolled material W rolled by the work roll 2 by changing the roll crown of the work roll 2, and locally heats the work roll 2. Or heating means 7 for changing the roll crown (thermal crown) by cooling or cooling. The heating means 7 employs a method of injecting coolant or the like heated (cooled) on the work roll 2 or a method of inductively heating the work roll 2. Either method heats a member such as an injection nozzle or an induction coil. (Cooling) It must be deployed around the work roll 2 that is the target.

  However, in the multi-high rolling mill 1, as described above, the intermediate roll 3 and the backup roll 4 are provided so as to surround the work roll 2 on the outside of the work roll 2, and the shape control means 6 is attached above and below the work roll 2. Often the installation space cannot be secured. Further, if the strip guide 5 having the functions of preventing rolling of the rolled material W, passing plate guide, and roll coolant injection is provided, it is not possible to secure an installation space for attaching the shape control means 6 to the left and right sides of the work roll 2. End up.

  Therefore, the shape control means 6 provided in the multi-high rolling mill 1 of the present embodiment uses the intermediate roll 3 (support roll 12) instead of the work roll 2 as a target to be locally heated or cooled. Specifically, the shape control unit 6 of the present embodiment includes a heating unit 7 that locally heats the intermediate roll 3, and the intermediate roll 3 is heated locally by the heating unit 7, whereby the intermediate roll 3 is heated. 3 is provided with a roll crown (thermal crown), and the roll crown of the work roll 2 is indirectly adjusted via the intermediate roll 3. In the shape control means 6 and the shape control method of the present embodiment, what heats the intermediate roll 3 locally is referred to as “heating means 7”. Needless to say, the “heating means 7” includes the intermediate roll 3 locally. A cooling means for cooling may be attached.

Next, the multi-high rolling mill 1 provided with the shape control means 6 of 1st Embodiment is demonstrated using FIGS. 1-4. The shape control means 6 of the present embodiment has a heating means 7 that locally heats the intermediate roll 3 that contacts the work roll 2, and the heating means 7 of the first embodiment has an induced current on the surface of the intermediate roll 3. An induction coil for generating
As shown in FIG. 2, the heating means 7 includes a heater body 8 having an induction coil therein, and a support frame body 9 that supports the heater body 8. The heater body 8 is a plate-like member having an induction coil built therein, and is attached to a position separated from the outer peripheral surface of the intermediate roll 3 by a certain distance. The support frame body 9 is a frame member for attaching the heater body 8 at a constant distance from the intermediate roll 3, and wiring for supplying electric power to the heater body 8 is housed inside.

  As described above, the heating means 7 is provided at four locations corresponding to each of the four intermediate rolls 3 provided in total. For example, the heater body 8 is positioned so as to face the lower left outer peripheral surface of the intermediate roll 3 with respect to the upper left intermediate roll 3, and the lower right of the intermediate roll 3 with respect to the upper right intermediate roll 3. The heating means 7 is mounted in such a manner that the mounting direction is reversed on the left and right so that the heater body 8 is located facing the outer peripheral surface.

As shown in FIG. 3, in the first embodiment, the heating means 7 is provided at two positions on both end sides in the width direction (direction along the axis), and each moves in the width direction of the intermediate roll 3. This is possible, and any position in the width direction can be locally heated.
In the heating means 7, high-frequency magnetic field lines are radiated from the induction coil of the heater body 8 into the intermediate roll 3 so that a magnetic field can be formed inside the intermediate roll 3. When a magnetic field is generated inside the intermediate roll 3 in this way, an eddy current is generated inside the intermediate roll 3, Joule heat is generated due to the electric resistance of the eddy current, and only the portion where the magnetic lines of force in the intermediate roll 3 are radiated. Is heated in a non-contact state.

  As shown in FIG. 3 and FIG. 4, in the heating means 7, the closer the distance from the heating means 7, the stronger the magnetic field is generated inside the intermediate roll 3, and the generation of larger Joule heat becomes possible. In the example, both end portions 3a of the intermediate roll 3 provided with the heating means 7 have a higher temperature than the central portion 3b. As a result, by using such a heating means 7, a roll crown can be imparted to the intermediate roll 3 such that both end portions 3 a are thermally expanded from the central portion 3 b and have a large diameter. The work roll 2 is also affected by the roll crown of the intermediate roll 3, so that both end portions 2a have a larger diameter than the central portion 2b, and the shape of the rolled material W rolled by the work roll 2 can be controlled. It becomes.

  As described above, the heating means 7 of the first embodiment is attached to the intermediate roll 3 instead of the work roll 2 to locally heat the intermediate roll 3. For example, if it demonstrates using FIG. 2, the strip guide 5 is arrange | positioned to the side of the work roll 2, and the installation space which can attach the heater main body 8 cannot be ensured. However, if it is the lower right side of the intermediate roll 3, a space for installing the heater body 8 can be sufficiently secured, and the heating means 7 can be provided without being restricted by the installation space.

  Further, when the surface temperature of the work roll 2 in contact with the rolled material W is increased, the friction coefficient between the work roll 2 and the rolled material W may be slightly changed to cause uneven gloss in the rolled material W. However, in the heating means 7 of the first embodiment for heating the intermediate roll 3, the work roll 2 is not provided with the heating means 7, and the surface temperature of the work roll 2 is higher as the intermediate roll 3 is directly heated. There is no. Therefore, it is possible to suppress or prevent the occurrence of uneven glossiness than when the work roll 2 is heated.

  Furthermore, in the multi-high rolling mill 1, the intermediate roll 3 is generally larger in diameter than the work roll 2, and the roll crown of the work roll 2 changes more greatly when the large-diameter intermediate roll 3 is heated and thermally expanded. The rolling shape of the rolled material W can be changed more significantly. For example, the amount of thermal expansion ΔL of the roll is expressed as ΔL = α × L × ΔT using the roll diameter L, the linear expansion coefficient α, and the temperature change ΔT. When the work roll 2 and the intermediate roll 3 are formed of a material having the same linear expansion coefficient, the larger the roll diameter L, the larger the amount of thermal expansion ΔL with respect to the temperature change ΔT. Heating the intermediate roll 3 can change the roll crown more greatly.

  It is known that the deflection deformation generated in the small-diameter work roll 2 shows a cross section represented by a high-order change curve. Accordingly, since the work roll 2 bends like a roll crown applied to the intermediate roll 3, the roll gap changes at the position in the width direction corresponding to the roll crown of the intermediate roll 3. It is possible to change the shape at the position in the width direction corresponding to the heating position (as in the case of local heating).

In addition, since the induction heating type heating means 7 shown in the first embodiment does not use a coolant that may ignite as in the second embodiment described later, the intermediate roll 3 is heated to a higher temperature and the workpiece is heated. A large roll crown can be imparted to the roll 2.
“Second Embodiment”
Next, the shape control means 6 of 2nd Embodiment is demonstrated.

The shape control means 6 of the second embodiment includes an injection-type heating means 7 that injects a temperature-adjusted coolant instead of the induction heating-type heating means 7 described in the first embodiment.
As shown in FIG. 5, the heating unit 7 of the second embodiment includes a coolant injection unit 10 (injection nozzle) that injects coolant onto the surface of the intermediate roll 3, and a pipe 11 that supplies the coolant to the coolant injection unit 10. It has. The pipe 11 is connected to a temperature regulator (not shown), and the temperature regulator can be adjusted to a predetermined temperature by heating or cooling the coolant.

The coolant injection means 10 is an injection nozzle for injecting the temperature-adjusted coolant onto the surface of the intermediate roll 3, and is attached at a position spaced apart from the outer peripheral surface of the intermediate roll 3, and the coolant is predetermined. It is the composition which can inject with the strength (flow rate) of.
As shown in FIG. 6, in the heating means 7 of the second embodiment, only the intermediate roll 3 in the injection portion is locally heated or cooled by the coolant injected from the coolant injection means 10 toward the surface of the intermediate roll 3. Thus, a roll crown can be imparted to the intermediate roll 3.

  Moreover, the heating means 7 is provided so that it can move to the width direction of the intermediate roll 3 at two positions on both ends in the width direction, and any position in the width direction of the intermediate roll 3 can be localized. It can be heated. For example, when a coolant heated to a temperature higher than the surface temperature of the intermediate roll 3 is sprayed from the heating means 7 shown in FIG. 6 to both ends of the intermediate roll 3, both ends of the intermediate roll 3 become hotter than the center. As a result, similarly to the heating means 7 of the first embodiment, the intermediate roll 3 can be provided with a roll crown whose both end portions are thermally expanded from the central portion to have a large diameter, and comes into contact with the intermediate roll 3. The shape of the rolled material W rolled by the work roll 2 can be controlled.

The shape control means 6 of the second embodiment employs the injection-type heating means 7 having a simple structure as compared with the induction heating-type heating means 7 of the first embodiment, so that the price of the apparatus can be kept low. Maintenance is also easy and can be easily added to existing equipment.
In addition, if the coolant is cooled to a temperature lower than the surface temperature of the intermediate roll 3 by the temperature regulator and the cooled coolant is injected to the intermediate roll 3, the diameter of the injected intermediate roll 3 can be reduced. Become. Therefore, in the shape control means 6 of the second embodiment, it is possible to give more various roll crowns to the work roll 2 and more precisely control the shape of the rolled material W.
“Third Embodiment”
Next, the shape control means 6 of 3rd Embodiment is demonstrated.

The shape control means 6 of the third embodiment is a gas such as air or gas whose temperature is adjusted instead of the induction heating type heating means 7 and the coolant injection type heating means 7 described in the first embodiment (hereinafter referred to as gas). Gas injection type heating means 7 for injecting.
As shown in FIG. 7, the heating means 7 of the third embodiment supplies a gas injection means 15 (injection nozzle) that injects gas onto the surface of the intermediate roll 3 and a temperature-controlled gas to the gas injection means 15. The gas piping 16 is provided. The gas pipe 16 is connected to a temperature regulator (not shown), and the temperature regulator can be adjusted to a predetermined temperature by heating or cooling the gas.

The gas injection means 15 is an air nozzle for injecting a temperature-adjusted gas onto the surface of the intermediate roll 3, and is spaced from the outer peripheral surface of the intermediate roll 3 in the same manner as the coolant injection means 10 of the second embodiment. It is attached to the position where the gas can be injected at a predetermined flow rate.
As shown in FIG. 8, in the heating means 7 of the third embodiment, only the intermediate roll 3 on which the gas is sprayed is heated locally by the gas sprayed from the gas injection means 15 to the surface of the intermediate roll 3. It is cooled and a roll crown can be imparted to the intermediate roll 3.

  The shape control means 6 of the third embodiment is greatly characterized in that the medium sprayed on the surface of the intermediate roll 3 is a gas, compared to the coolant injection type heating means 7 of the second embodiment. That is, unlike the case of the second embodiment, there is no concern that the coolant contacts the surface of the intermediate roll 3, and therefore there is no concern that gloss unevenness will occur on the intermediate roll 3 or the work roll 2.

In addition, since the other structure and effect which the shape control means 6 of 3rd Embodiment have are the same as 2nd Embodiment, description with respect to them is abbreviate | omitted.
Moreover, in the shape control means 6 of 3rd Embodiment, although the example which sends gas to the gas injection means 15 after heating or cooling gas to predetermined temperature with the temperature regulator was given, for example, a heater is added to the gas injection means 15 If the built-in one is used, the temperature of the gas can be adjusted only by the gas injection means 15.
“Fourth Embodiment”
Next, the shape control means 6 of 4th Embodiment is demonstrated.

  As shown in FIG. 9, the shape control means 6 of the fourth embodiment includes the same heating means 7 as the induction heating type heating means 7 of the first embodiment, but is different from the first embodiment. A plurality of induction heating type heating means 7 are arranged at equal intervals in the axial direction (roll width direction) of the intermediate roll 3, and only a predetermined position of the plurality of arranged heating means 7 is operated to operate the intermediate roll 3. Only a part in the roll width direction can be heated.

In addition, in the shape control means 6 of 4th Embodiment, although the induction heating type is employ | adopted as the heating means 7, the heating means 7 is the jet type demonstrated in 2nd Embodiment, or the hot-air heating demonstrated in 3rd Embodiment. An expression may be adopted.
In the shape control means 6 of the fourth embodiment, the heating pattern of the intermediate roll 3 can be changed in the width direction depending on which position in the roll width direction of the plurality of heating means 7 is operated. it can. For example, in the illustrated example, the gray heating means 7 is heated, and both end portions 3a in the width direction of the intermediate roll 3 are heated and expanded with respect to the central portion 3b. If it does in this way, since delicate adjustment with respect to the roll crown of the work roll 2 is attained, the rolling shape of the rolling material W can be adjusted more precisely.
“Fifth Embodiment”
The first to fourth embodiments described above are examples in which the shape control means 6 is provided on the intermediate roll 3 of the cluster type multi-high rolling mill. On the other hand, in the multi-high rolling mill 1 of the fifth embodiment, the shape control means 6 is provided on the backup roll 4 of the cluster-type multi-high rolling mill to heat the backup roll 4.

  In the conventional shape control means shown in FIG. 11A, the backup roll 4 includes a bearing 13 (divided roll) divided in the width direction and a plurality of saddles 14 that rotatably support the shaft of the bearing 13. And have. The saddle 14 can be individually moved to the work roll 2 side using means such as hydraulic pressure or an electric motor. If the saddle 14 moves to the work roll 2 side, the shaft end of the bearing 13 supported by the saddle 14 is supported. Also moves to the work roll 2 side.

  When the shape is controlled using the conventional shape control means described above, when one of the plurality of saddles 14 is moved to the work roll 2 side as shown in FIG. 11B, the saddle 14 is adjacent in the width direction. The shaft ends of the two bearings 13 are moved to give a roll crown to the backup roll 4, and the roll crown can be given to the work roll 2 via the intermediate roll 3.

  Compared to the above-described conventional roll crown control using the saddle 14 provided on the backup roll 4 and the crown control of the method in which an eccentric ring is inserted in the backup roll bearing and the position of each bearing is changed by hydraulic pressure or the like. 11 (c), in the shape control means 6 of the fifth embodiment, the above-described heating means 7 is provided so as to be spaced from the backup roll 4 and movable in the width direction of the backup roll 4, and the bearing 13 Further, it is possible to control a part of the roll crown more locally by heating the part.

Since the shape control means 6 of the fifth embodiment can change the roll crown slightly as compared with the control of the roll crown by the saddle 14 described above, it is used in combination with the control of the roll crown by the saddle 14 and is auxiliary. By using the roll crown, the roll crown can be controlled more precisely than the conventional one.
In addition, although the injection-type heating means 7 is used for the shape control means 6 in FIG. 11C, it goes without saying that the shape control means 6 of the fifth embodiment is of the induction heating type or hot air heating type described above. The heating means 7 can also be used.
“Sixth Embodiment”
The first to fifth embodiments described above are examples in which the shape control means 6 is provided in the intermediate roll 3 and / or the backup roll 4 provided in the cluster type multi-high rolling mill. However, the multi-high rolling mill 1 provided with the shape control means 6 of the present invention includes not only a cluster type but also a vertical rolling mill. Next, the multi-high rolling mill of this embodiment will be described by taking a vertical four-high rolling mill or a six-high rolling mill provided with the shape control means 6 described above as a sixth embodiment.

The vertical four-high rolling mill is provided with backup rolls 4 on the outer sides of the pair of upper and lower work rolls 2 (the upper side of the upper work roll 2 and the lower side of the lower work roll 2).
In the case of this four-high rolling mill, each backup roll 4 is provided with the heating means 7 described above, and by operating this heating means 7, the backup roll 4 can be locally heated in the width direction. . As a result, the roll crown of the work roll 2 can be finely adjusted via the backup roll 4, and the rolled shape of the rolled material W can be adjusted more precisely.

  In the case of a 6-high rolling mill, the backup roll 4 is provided outside the pair of upper and lower work rolls 2 via the intermediate roll 3, so that the heating means 7 described above may be provided on the intermediate roll 3. Alternatively, the backup roll 4 may be provided with the heating means 7. Of course, the heating means 7 can be provided on both the intermediate roll 3 and the backup roll 4.

Next, how the shape of the rolled material W changes when shape control is performed using the shape control means 6 of the present invention will be described in detail using Examples and Comparative Examples.
FIG. 10 shows a rolled material when a stainless steel foil having a width of 500 mm and a plate thickness of 50 μm is used as a rolled material W, and this rolled material W is rolled by a multistage rolling mill 1 having a roll barrel length of 600 mm and a work roll 2 of 50 mmφ at the top and bottom. The difference in elongation (I-unit) based on the center in the width direction generated in W is compared between the example and the comparative example.

The multi-high rolling mill 1 includes a pair of intermediate rolls 3 each having a roll barrel length of 650 mm and approximately 70 mmφ on the outside of the work roll 2 described above. In the embodiment, the coolant is evenly sprayed in the range of 155 to 220 mm from the center in the roll width direction to both ends of the intermediate roll 3. Moreover, a comparative example sprays a coolant equally in the range of 155-220 mm from the center of a roll width direction to the both ends side with respect to the work roll 2. FIG. In addition, the coolant injected to the intermediate roll 3 and the work roll 2 is prepared as one heated to 40 ° C. and one heated as 60 ° C., and the coolant is not injected for comparison. The difference in elongation rate (I-unit) with respect to the center of the direction is determined by dividing the rolled material W into a plurality of strips in the width direction and measuring the length of each strip as the reference length. is the L _0, when the difference in elongation between the larger strip and the reference length L ₀ of the fastest growing and [Delta] L, elongation difference with reference to the width direction center (I-unit) is, ΔL / L ₀ × 10 It is represented by ⁵ .

FIG. 10A shows the result of the example in which the intermediate roll 3 was heated, and FIG. 10B shows the result of the comparative example in which the work roll 2 was heated. 10A and 10B show the difference in elongation of the rolled material W according to the distance from the center in the roll width direction.
Looking at the result when the coolant injection is not performed in FIG. 10 (a) (results indicated by solid diamonds in the figure), there is a region where the elongation ratio is less than 0 in the region of 155 mm to 220 mm from the center in the width direction. Existing.

For a portion with such a small elongation ratio, the heated coolant is sprayed from the center in the width direction of the intermediate roll 3 to a region of 155 mm to 220 mm, thereby adjusting the roll crown of the work roll 2 and adjusting the elongation ratio. Can be high.
For example, in the case of injecting the coolant heated to 40 ° C. shown in FIG. 10A (results indicated by white triangles in the figure), the elongation ratio in the region of 155 mm to 220 mm is the maximum at I-unit. It is as high as about 18. In addition, in the case of injecting coolant heated to 60 ° C. (results indicated by crosses in the figure), the difference in elongation with respect to the center in the width direction in the same region is as high as about 50 at I-unit. It has become.

However, in the result of the comparative example (FIG. 10B) in which the heated coolant is directly sprayed from the center in the width direction of the work roll 2 to the region of 155 mm to 220 mm to adjust the roll crown of the work roll 2, the elongation ratio is Is not as high as the result of FIG.
For example, in the case of injecting a coolant heated to 40 ° C., the difference in elongation relative to the center in the width direction is a maximum of about 9 in I-unit, and in the case of injecting a coolant heated to 60 ° C., the elongation ratio is a maximum of 35 The elongation ratio is clearly smaller than when the heated coolant is sprayed onto the intermediate roll 3. Furthermore, when the work roll 2 is directly heated, the heating temperature of the coolant cannot be increased to 60 ° C. in consideration of suppressing the occurrence of uneven glossiness in the rolled material W. Therefore, in the embodiment in which the coolant whose temperature is adjusted is injected to the intermediate roll 3 and the roll crown of the work roll 2 is indirectly adjusted via the intermediate roll 3, the coolant is directly injected to the work roll 2. From the comparative example, it can be seen that the elongation ratio of the rolled material W can be increased and a larger shape control ability can be exhibited.

  From these results, the shape control means 6 of the present invention injects hot coolant onto the intermediate roll 3, thereby changing the exit shape of the rolled material W at a position corresponding to the hot coolant injection position. It is an effective shape control means for the combined elongation, and it can also be used as an effective shape control actuator for preventing plate breakage (as compared with roll bending and shift function) by extending the edge portion. It can be said.

By the way, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
For example, in the above-described embodiment, the shape control method and the shape control means 6 of the present invention have been described by using the induction heating type heating means and the injection type heating means. However, the heating means 7 used in the shape control method and the shape control means 6 of the present invention is a method other than the induction heating type or the injection type, for example, air or gas whose temperature is adjusted to a predetermined temperature is jetted onto the intermediate roll 3. It is also possible to adopt a method of attaching.

DESCRIPTION OF SYMBOLS 1 Multi-high rolling mill 2 Work roll 2a Both ends of work roll 2b Center part of work roll 3 Intermediate roll 3a Both ends of intermediate roll 3b Center part of intermediate roll 4 Backup roll 5 Strip guide 6 Shape control means 7 Heating means 8 Heater Main body 9 Support frame body 10 Coolant injection means 11 Pipe 12 Support roll 13 Bearing 14 Saddle 15 Gas injection means 16 Gas pipe W Rolled material

Claims (4)

Two intermediate rolls that are in contact with the work rolls are provided on the outer sides of the pair of upper and lower work rolls for rolling the rolled material, and the outer diameter of the intermediate rolls is larger than that of the intermediate rolls. A multi-high rolling mill in which three backup rolls are arranged so as to contact the intermediate roll,
Wherein the roll crown of the work rolls in contact with the intermediate rolls in order to change, heating means facing the outer circumferential surface of the intermediate rolls through the rolling material side of the backup roll to heat the intermediate roll locally Is provided along the axial direction of the intermediate roll.   The multi-stage rolling mill according to claim 1, wherein the heating unit includes an induction coil that generates an induced current on a surface of the intermediate roll.   2. The multi-stage rolling mill according to claim 1, wherein the heating unit includes a coolant injection unit that injects a coolant whose temperature is adjusted onto a surface of the intermediate roll.   2. The multi-high rolling mill according to claim 1, wherein the heating unit includes a gas injection unit that injects a temperature-adjusted gas onto a surface of the intermediate roll.