JP2013018034A - Method for changing roller of rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make work rollers be dismounted simply while a rolling stock is passed through, in a rolling apparatus provided with a multistage rolling mill.SOLUTION: In the method for changing the rollers of the rolling mill, when changing the work rollers 5 while the rolling stock is passed through by stretching the rolling stock W over an unwinding reel 3 and a take-up reel 4, in a rolling apparatus 2 which includes: a multistage rolling mill 1 having a pair of upper and lower work rollers 5 for rolling the rolling stock W; the unwinding reel 3 for delivering the rolling stock W to the multistage rolling mill 1; and the take-up reel 4 for taking up the rolling stock W rolled with the multistage rolling mill 1, the horizontal position of the rolling stock W is adjusted so that the pass line of the rolling stock W which is passed through the work rollers 5 and, after that, the work rollers 5 are dismounted from the multistage rolling mill 1 or incorporated in the multistage rolling mill 1.

Description

  The present invention relates to a roll changing method for a rolling mill.

As is well known, when rolling a rolled material such as a foil material, a multi-stage rolling mill in which a plurality of rolls are combined is used. As an example of this multi-stage rolling mill, there is a “cluster-type multi-stage rolling mill” that expands in a fan-like manner when the intermediate roll supporting the work roll and the backup roll supporting the intermediate roll are viewed from the side. Are known.
In general, when rolling with a multi-high rolling mill, it is necessary to replace the work roll in accordance with the type of rolled material, the thickness of the final product, and the like. However, particularly in the case of a cluster type multi-high rolling mill, a plurality of intermediate rolls, backup rolls, and the like are provided around the work roll, and the roll arrangement is often complicated. Therefore, when rearranging a work roll or the like, methods as shown in Patent Documents 1 to 3 have been adopted.

  For example, Patent Document 1 discloses that a multi-stage rolling mill raises the upper housing and raises the upper work roll to form a gap between the upper and lower work rolls. The upper fork part that supports the lower outer peripheral surface of the upper work roll is advanced along the axis, and the upper work roll is loaded on the upper fork part by releasing the holding relation of the upper work roll with respect to the upper housing. Disclosed is a roll changing method for a multi-stage rolling mill in which the upper work roll is pulled out by moving the upper fork section out of the multi-stage rolling mill, or the upper work roll is inserted by performing these reverse procedures. Yes.

  Further, in Patent Document 2, a roll support member that supports a rolling roll (work roll) of a multi-stage rolling mill from below along its axis, and a rolling roll supported by the roll support member are provided to the multi-stage rolling mill. When a rolling roll of a multi-stage rolling mill equipped with a moving mechanism for moving the roll support member to be inserted or removed and an inclination mechanism capable of tilting the roll support member in the vertical direction, the roll support member is rolled. Insert the roll in a downward direction to a position almost below the roll, place it on the roll support member so that it rolls up, then return it to a substantially horizontal position and pull it out of the multi-high rolling mill while maintaining the substantially horizontal state. A roll changing method for a multi-high rolling mill is disclosed.

The roll reassignment method of these patent documents 1 and patent documents 2 inserts a fork part and a roll support member under the work roll, and pulls the roll to the side of the rolling mill while being placed on these members. It is possible to rearrange only work rolls without removing rolls such as intermediate rolls and backup rolls.
On the other hand, Patent Document 3 includes a horizontal holding roller that has bearing boxes at both ends of a work roll (work roll) and holds the work roll horizontally, and a strip guide guide that extends parallel to the work roll axis. A method for changing a work roll of a six-stage multi-high rolling mill having the same is disclosed. Thereby, at the time of roll replacement, the horizontal holding roller is retracted and the strip guide is advanced, and the bearing box of the work roll can be supported at the tip.

  The roll changing device of Patent Document 3 temporarily retracts an intermediate roll or a backup roll to a position away from the vicinity of the work roll, and secures a space for moving the roll around the work roll. The work rolls are removed and rearranged by horizontally moving each of the bearing boxes.

Japanese Patent No. 3416251 Japanese Patent No. 4226457 JP 61-42407 A

  By the way, when rolling a material with a short length (short material), a leader material is used to supplement the length of the short material, and the leader material is connected to both ends of the rolled material by welding or the like. Is extended. However, when rolling such a short material, if the aforementioned connecting portion (welded portion between the rolled material and the leader material) is brought into contact with the deflector roll as it is, wrinkles may occur in the deflector roll. .

Therefore, when rolling a short rolled material, rolling can be performed with the deflector roll kept away from the rolled material so as not to damage the deflector roll, in other words, with the deflector roll removed from the pass line. Conceivable.
In such “rolling without using a deflector roll”, a situation occurs in which the work roll is replaced by using the techniques of Patent Documents 1 to 3 described above while rolling is interrupted and the rolled material is passed through. obtain.

In this case, since the height position of the take-up reel and the take-up reel is constant, it is rare that the height of the coil unwind position and the work roll height and the height of the coil take-up position are horizontal. In this case, an inclination (inclination of the rolling pass line) occurs in the rolled material from the unwinding reel through the work roll to the take-up reel.
If you try to move the work roll to the side while the rolled material is passed through in a state inclined to the horizontal direction, the inclined rolled material becomes an obstacle when removing or attaching the work roll, and workability As well as damage to the rolled material or work roll. If the tension of the rolled material is temporarily reduced to zero, the rolled material hangs down and the inclination of the rolled material becomes stronger, and the work roll replacement operation may become more difficult.

  The present invention has been made in view of the above-mentioned problems, and even when the pass line of the rolled material passing through the work roll is not horizontal, the rolled material is allowed to pass between the work rolls. It aims at providing the roll rearrangement method of a rolling mill which can perform the rearrangement of a work roll easily.

In order to achieve the above-described object, the present invention takes the following technical means.
The roll changing method for a rolling mill according to the present invention includes a multistage rolling mill having a pair of work rolls for rolling a rolled material, an unwinding reel for feeding the rolled material to the multistage rolling mill, and the multistage rolling mill. In a roll reassigning method of a rolling apparatus provided with a take-up reel that winds up the rolled material, the work roll is re-set while the rolled material is passed over the unwinding reel and the take-up reel and passed through. The horizontal position of the rolled material is adjusted so that the pass line of the rolled material passing between the pair of work rolls is substantially horizontal, and then the work roll is inserted into and removed from the multi-stage rolling mill. And

  Preferably, between the unwinding reel and the work roll, a deflector roll on the unwinding side that changes the conveying direction of the rolled material unrolled from the unwinding reel is provided so that the position can be adjusted in the vertical direction. Between the work roll and the take-up reel, a deflector roll on the take-up side that changes the conveying direction of the rolled material unwound from the work roll is provided so as to be vertically adjustable, and the unwind side And by changing the vertical height of the deflector roll on the winding side, the horizontal position of the rolled material is adjusted so that the pass line of the rolled material passing between the pair of work rolls is substantially horizontal. Good.

  More preferably, at least one deflector roll on the unwinding side and the winding side is composed of a pair of upper and lower upper deflector rolls and lower deflector rolls arranged to face each other with the rolled material interposed therebetween. By changing the height, the horizontal position of the rolled material may be adjusted so that the pass line of the rolled material passing between the pair of work rolls is substantially horizontal.

  According to the roll changing method for a rolling mill according to the present invention, the rolled material is passed between the work rolls even when the pass line of the rolled material passing between the pair of work rolls is not horizontal. The work rolls can be easily rearranged.

It is the front view which showed the rolling apparatus provided with the multistage rolling mill. It is the figure which showed the roll rearrangement method in case the pass line of a rolling material is convex. It is the figure which showed the roll rearrangement method in case the pass line of a rolling material is concave shape. It is the figure which showed the roll rearrangement method at the time of inclining so that the pass line of a rolling material may become high as it goes to the winding side from the unwinding side. It is the figure which showed the roll rearrangement method at the time of inclining so that the pass line of a rolling material may become low as it goes to the winding side from the unwinding side.

Hereinafter, an embodiment of a roll changing method for a rolling mill according to the present invention will be described with reference to the drawings.
In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
FIG. 1 shows a rolling device 2 provided with a cluster-type multi-high rolling mill 1 (hereinafter simply referred to as multi-high rolling mill 1) used in the roll changing method of the present invention. 1 is a 12-stage type, the number of stages of the multi-stage rolling mill to which the present invention is applied is not limited to 12. A multi-high rolling mill such as a 4-stage, a 6-stage, or a 20-stage may be used.

The multi-stage rolling mill 1 rolls a rolled material W made of a metal material such as stainless steel or special steel into a plate material or the like, and has a pair of work rolls 5 arranged vertically.
Each work roll 5 is supported by a plurality (two) of intermediate rolls 9, and the intermediate roll 9 is supported by a plurality (three) of backup rolls 10 positioned on the outermost side. The intermediate roll 9 and the backup roll 10 are arranged in a fan-shaped manner (cluster type) like a bunch of straws up and down with the work roll 5 as a center.

The outermost backup roll 10 is rotatably supported by the mill housing 12 via a shaft support portion 11 incorporating a bearing and the like. A driving mechanism composed of a motor or the like is connected to the intermediate roll 9 and transmits a rotational force to the work roll 5.
The mill housing 12 includes an upper mill housing 12U that supports the upper backup roll 10 and a lower mill housing 12D that supports the lower backup roll 10. A column 13 is provided between the upper mill housing 12U and the lower mill housing 12D to connect them. The upper mill housing 12U can be moved up and down with respect to the lower mill housing 12D.

An unwinding reel 3 for unwinding the rolled material W is provided on the left side of the multistage rolling mill 1, and a take-up reel 4 for winding the rolled material W is provided on the right side of the multistage rolling mill 1. With respect to the unwinding reel 3 and the take-up reel 4, the rolled material W is unwound on the upper side and is wound on the upper side.
The multi-stage rolling mill 1 performs rolling while feeding the rolled material W to the right (in the direction of the black arrow in the figure), and then switches the rolling direction to the left (in the direction of the white arrow in the figure) to perform the next rolling. As is done, reverse rolling can be performed while switching the rolling direction between forward and reverse alternately.

  In reverse rolling, when the rolling direction is rightward, the reel on the left side of the multi-high rolling mill 1 becomes the unwinding reel 3 and the reel on the right side becomes the take-up reel 4. When the rolling direction is leftward, the left reel of the multi-high rolling mill 1 is the take-up reel (4), and the right reel is the unwind reel (3). That is, the left and right reels alternately serve as the unwinding reel 3 and the take-up reel 4.

The unwinding reel 3 and the winding reel 4 can apply tension to the rolled material W by adjusting the unwinding / winding speed. That is, it has a function as a tension reel.
Further, between the multi-high rolling mill 1 and the unwinding reel 3, a deflector on the unwinding side for feeding the rolled material W to the work roll 5 while changing the conveying direction of the rolled material W unwound from the unwinding reel 3. A roll 6 is provided. Further, between the multi-stage rolling mill 1 and the take-up reel 4, a take-off side deflector that sends the rolled material W to the take-up reel 4 while changing the conveying direction of the rolled material W unwound from the work roll 5. A roll 7 is provided.

Specifically, the deflector roll 6 on the unwinding side is provided above the rolled material W so as to be in contact with the upper surface of the rolled material W, and faces the upper deflector roll 6U, and the rolled material. The lower deflector roll 6 </ b> D is provided below the W and can contact the lower surface of the rolled material W.
The deflector roll 7 on the winding side is provided above the rolled material W so as to be in contact with the upper surface of the rolled material W, and faces the upper deflector roll 7U and below the rolled material W. And a lower deflector roll 7D which can be brought into contact with the lower surface of the rolled material W.

Each of these four deflector rolls 6U, 6D, 7U, and 7D is provided with a lifting mechanism 8 that moves (lifts and lowers) the deflector roll in the vertical direction. For example, a hydraulic cylinder or a screw jack can be used as the lifting mechanism 8.
In the embodiment shown in FIG. 1, a total of four upper and lower deflector rolls are provided on the unwinding side and the winding side, but only one of the upper and lower deflector rolls may be provided. Further, a plurality of deflector rolls on the unwinding side and the winding side may be arranged in the rolling material traveling direction.

  By the way, it is most desirable to adjust the horizontal position of the rolled material using a deflector roll in constructing the apparatus, but the present invention is not limited to this. For example, when the rolling device 2 is provided with a pinch roll, the pinch roll may function as the upper deflector rolls 6U and 7U. Moreover, you may use another roll, for example, a bridle roll and a wiper roll, for raising / lowering a rolling material.

The roll changing method of the present invention performed by the rolling apparatus 2 described above will be described.
In the roll changing method of the present invention, when the work roll 5 is removed while the rolled material W is passed over the unwinding reel 3 and the take-up reel 4 in the rolling device 2 described above, the rolled material W is removed. The horizontal position of the rolling material W is adjusted so that the upstream and downstream pass lines of the work roll 5 are substantially horizontal, and then the work roll 5 is subjected to multi-stage rolling. It is inserted into and removed from the machine 1.

Here, “substantially horizontal” means that the horizontal position of the rolled material W is substantially horizontal, and does not need to be completely horizontal. In inserting and removing the work roll, it is only necessary that the rolled material W is horizontal so as not to affect the work roll.
The level adjustment of the pass line is necessary for the following reason.
As shown in FIG. 1, when rolling a short material S (a material to be rolled with a short length), a leader material L is used to supplement the length of the short material S, and the rolled material W and the leader material L are Connected by welding. However, if the connecting portions A and B between the rolled material W and the leader material L are brought into contact with the deflector rolls 6 and 7 as they are, wrinkles are generated in the deflector rolls 6 and 7. For this reason, when rolling the rolled material W including the short material S, the deflector rolls 6 and 7 are kept away from the rolled material W so as not to bend the deflector rolls 6 and 7, in other words, the deflector roll 6 and Rolling is performed in a state in which the rolled material W is passed over the unwinding reel 3 and the take-up reel 4 using only the unwinding reel 3 and the take-up reel 4 while keeping 7 in a state removed from the pass line. .

  In such a rolling operation, it is necessary to replace the work roll 5 while interrupting the rolling operation and passing the rolled material W. In such a case, depending on the position where the rolling is interrupted, the difference between the winding diameter of the winding reel 3 and the winding diameter of the winding reel 4 becomes large, and the winding reel 4 passes from the winding reel 3 through the work roll 5. An inclination may occur in the pass line of the rolled material W toward the surface. Further, depending on the installation position of the take-up reel 3 and the take-up reel 4 and the size of the reel used, the pass line of the rolling material W from the work roll 5 toward the take-up reel 3 or the take-up reel 4 is inclined. May end up.

  Thus, if the work roll 5 is removed or incorporated while the rolling pass line is tilted with respect to the horizontal direction, the rolled material W tilted during loading and unloading becomes an obstacle. In particular, when the work roll 5 is pulled out to the side, the tension of the rolled material W is temporarily made zero or very small (no tension) so that a part of the tension is not applied as a frictional force. Then, the inclination of the rolled material W becomes stronger and the work of replacing the work roll 5 becomes more difficult.

Therefore, in the roll reassigning method of the present invention, after the tension of the rolled material W is set to the non-tensioned state, the horizontal direction of the rolled material W is set so that the upstream and downstream pass lines of the work roll 5 face the horizontal direction. The position is adjusted.
Specifically, the inclined state of the rolled material W may be as shown in FIGS. 2 (a) to 5 (a). In the roll changing method of the present invention, the rolled material W is adapted to each inclined state. The pass line is adjusted almost horizontally.

  In the rolling device 2 shown in FIG. 2A, the upper surface of the unwinding reel 3 and the upper surface of the take-up reel 4 are lower than the upper surface of the lower work roll 5. In such a case, the inclined state of W is convex upward. The situation shown in FIG. 2A can occur when the initial setting position of the take-up reel 3 and the initial setting position of the take-up reel 4 are set lower than the work roll 5 or when a small-diameter reel is used.

  In such a case, as shown in FIG. 2 (b), first, the tension acting on the rolled material W is made substantially zero, and then the take-up reel 3 and the take-up reel 4 are brought into a free state, Both the positions of the lower deflector rolls 6D and 7D on the winding side are raised so that the upper surface height of the deflector rolls 6D and 7D is equal to the height of the work roll 5 (the upper surface height of the lower work roll 5). Adjust so that In other words, the point where the unwinding side deflector roll 6D and the rolling material W are in contact, the point where the winding side deflector roll 7D and the rolling material W are in contact, and the three points of reduction by the work rolls 5 and 5 are on a substantially horizontal line. Both the positions of the lower deflector rolls 6D and 7D on the unwinding side and the winding side are raised so that the other two points are located slightly above the roll-down point by the work rolls 5 and 5.

When the unwinding reel 3 and the take-up reel 4 are in a free state and the deflection of the rolled material W becomes excessive, the unwind reel 3 and the take-up reel 4 are slightly rotated by inching. Then, a slight tension may be applied to the rolled material W.
Thus, if the height of the deflector rolls 6D and 7D and the height of the work roll 5 are made equal, the direction of the pass line of the rolled material W is adjusted to be substantially horizontal. In addition, the upper mill housing 12U is raised with respect to the lower mill housing 12D to secure a space that allows the work roll 5 to move between the upper rolled material W and the upper mill housing 12, and A fork and a roll support member are inserted below the work roll 5, and the upper work roll 5 is pulled out to the side of the multi-high rolling mill 1 while being placed on these members. Similarly, if the lower work roll 5 is removed, it is easy to remove the work roll 5 while the rolled material W is passed through the rolled material W whose pass line is not initially horizontal. And it can be done reliably.

  The same applies to the case where the work roll 5 is attached. The upper surface height of the unwinding and winding deflector rolls 6D and 7D is equal to the upper surface height of the lower work roll 5, and the direction of the pass line of the rolling material W Adjust the to approximately horizontal. Then, the upper mill housing 12U is raised with respect to the lower mill housing 12D to secure a space that allows the work roll 5 to move between the upper rolled material W and the upper mill housing 12, and the lower side. The work rolls 5 and then the upper work roll 5 are inserted in this order.

  On the other hand, in the rolling device 2 shown in FIG. 3A, the upper surface of the unwinding reel 3 and the upper surface of the take-up reel 4 are higher than the upper surface of the lower work roll 5. In such a case, the inclined state of the rolled material W is concave. The situation shown in FIG. 3A can occur when the initial setting position of the take-up reel 3 and the initial setting position of the take-up reel 4 are set higher than the work roll 5 or when a large-diameter reel is used.

  In such a case, as shown in FIG. 3B, the positions of the upper deflector rolls 6U and 7U on the unwinding side and the winding side are lowered, and the height of the lower surface of the deflector rolls 6U and 7U and the work roll 5 (The upper surface of the lower work roll 5) or the other two points may be slightly higher than the height of the upper surface of the lower work roll 5. After that, as described in the example of FIG. 2, the work roll 5 is inserted and removed.

  When the winding diameter of the unwinding reel 3 is small and the winding diameter of the winding reel 4 is large as in the rolling device 2 shown in FIG. 4A, the height of the upper surface of the unwinding reel 3 is lower. The height of the upper surface of the work roll 5 may be lower, and the height of the upper surface of the take-up reel 4 may be higher than the height of the upper surface of the lower work roll 5. That is, the rolled material W that goes from the unwinding reel 3 to the take-up reel 4 through the work roll 5 has an upward slope.

In this case, as shown in FIG. 4B, the position of the lower deflector roll 6D on the unwinding side is raised, the position of the upper deflector roll 7U on the winding side is lowered, and the height of the deflector rolls 6D and 7U and the workpiece It is preferable that the height of the roll 5 (the upper surface of the lower work roll 5) be substantially equal. Thereafter, the work roll 5 is removed or assembled as described with reference to FIG.
Further, when the winding diameter of the unwinding reel 3 is large and the winding diameter of the winding reel 4 is small as in the rolling device 2 shown in FIG. 5A, the height of the upper surface of the unwinding reel 3 is lower. There is a possibility that the height of the upper surface of the work roll 5 becomes higher and the height of the upper surface of the take-up reel 4 becomes lower than the height of the upper surface of the lower work roll 5. That is, the rolling material W heading from the unwinding reel 3 to the take-up reel 4 through the work roll 5 is inclined downward to the right.

  In this case, as shown in FIG. 5B, the position of the upper deflector roll 6U on the unwinding side is lowered, the position of the lower deflector roll 7D on the winding side is raised, and the height of the deflector rolls 6U and 7D and the workpiece are increased. It is preferable that the height of the roll 5 (the upper surface of the lower work roll 5) be equal. In this way, the work roll 5 can be easily reassembled (attached or removed) while the rolled material W is still passed through the rolled material W whose pass line has an inclined state different from that shown in FIG. Can do.

  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.

DESCRIPTION OF SYMBOLS 1 Multi-high rolling mill 2 Rolling device 3 Unwinding reel 4 Rewinding reel 5 Work roll 6D Lower deflector roll on unwinding side 6U Upper deflector roll on unwinding side 7D Lower deflector roll on unwinding side 7U Upper on unwinding side Deflector roll 8 Lifting mechanism 9 Intermediate roll 10 Backup roll 11 Shaft support 12D Lower mill housing 12U Upper mill housing 13 Column A Connection portion B Connection portion L Leader material S Short material W Rolled material

Claims (3)

A multi-stage rolling mill having a pair of work rolls for rolling the rolled material, an unwinding reel for feeding the rolled material to the multi-high rolling mill, and a take-up reel for winding up the rolled material rolled by the multi-high rolling mill In the roll changing method of the rolling device,
When the work rolls are rearranged while the rolled material is passed over the unwinding reel and the take-up reel and passed, the pass line of the rolled material passing between the pair of work rolls is substantially horizontal. A roll changing method for a rolling mill, wherein a horizontal position of the rolled material is adjusted, and then the work roll is inserted into and removed from a multi-stage rolling mill. Between the unwinding reel and the work roll, a deflecting roll on the unwinding side that changes the conveying direction of the rolled material unwound from the unwinding reel is provided so as to be vertically adjustable, and the work roll And a take-up side deflector roll that changes the conveying direction of the rolled material unwound from the work roll is provided between the take-up reel and the take-up reel so that the position can be adjusted in the vertical direction.
By changing the vertical height of the deflector rolls on the unwinding side and the winding side, the horizontal position of the rolling material is adjusted so that the pass line of the rolling material passing between the pair of work rolls is substantially horizontal. The roll changing method for a rolling mill according to claim 1.   At least one deflector roll on the unwinding side and the winding side is composed of a pair of upper and lower upper deflector rolls and lower deflector rolls arranged to face each other with the rolled material interposed therebetween, and changes the vertical height of each deflector roll. The roll change of the rolling mill according to claim 2, wherein the horizontal position of the rolled material is adjusted so that a pass line of the rolled material passing between the pair of work rolls is substantially horizontal. Method.

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