JP2013006187A - Apparatus and method for rolling short size material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably perform rolling of a short size material without degrading productivity while preventing a deflector roll or the like provided to a rolling mill from being scratched.SOLUTION: The rolling apparatus 1 includes: the rolling mill 2 having work rolls 5 for rolling a rolled stock W which is made into a short size; an uncoiling reel 3 for uncoiling the rolled stock W to the rolling mill 2; and a coiling reel 4 for coiling the rolled stock W which is rolled by the rolling mill 2. The uncoiling reel 3 and the coiling reel 4 or the rolling mill 2 are arranged so that all of three positions of an unwinding position P1 which is a position where the rolled stock W is uncoiled from the uncoiling reel 3, a rolling reduction position P2 by the work rolls 5, and the coiling position P3 which is a position where the coiling reel 4 coils the rolled stock W are lined up nearly on a horizontal line.

Description

  The present invention relates to a rolling apparatus and a rolling method that enable rolling of a short rolled material.

As is well known, in plate rolling, plate rolling machines such as 2, 4, and 6 stages, and in some cases, 12 and 20 stages are used. As a coil rolling mill for plates, a general 2-stage, 4-stage, 6-stage rolling mill or a cluster in which an intermediate roll supporting a work roll and a backup roll supporting an intermediate roll spread like a bun There is a type of multi-stage rolling mill.
Patent Document 1 shows an example of a cluster type multi-high rolling mill.

  Now, consider rolling a short rolled material using such a multi-high rolling mill. The “short length” here means that the length of the rolled material (initial length) is shorter than the distance between the take-up reel and the unwind reel provided on the upstream and downstream sides of the multi-stage rolling mill. This is a typical example. The length of the rolled material is also referred to as “short” when it is sufficiently wound around the take-up reel and the unwind reel so that proper tension cannot be applied.

  As a technique for rolling such a short rolled material (short material), there are those disclosed in Patent Document 2 and Patent Document 3. The apparatuses disclosed in these patent documents move a rolled material on a table such as a roller conveyor with a rolling roll interposed therebetween.

JP 2010-89113 A JP-A-6-262222 JP-A-6-277736

By the way, when rolling a short material using a multi-stage rolling mill, the following rolling methods can be employed.
One is rolling with the short length of material, and it is made to bite into the rolling roll without applying tension to the tip of the short length material, and then the rear end is also rolled in a tensionless state. is there. The other is to connect another long plate for introduction (leader material) to the leading end and rear end of the short material by welding, etc., and the length of the rolled material as a whole to the take-up reel and unwinding reel. In this method, the rolled material is rolled to such an extent that it can be wound.

  Patent Document 1 does not describe any method for rolling the front end portion and the rear end portion in a tension-free state with a short material. Even in the rolling mills of Patent Documents 2 and 3, productivity is reduced because rolling at high speed and high pressure is difficult in tensionless rolling, and in particular, the length in the plate width direction and the plate crown at the front and rear end portions change. The portion cannot be made into a product, yield decreases, and it is difficult to ensure quality such as plate thickness accuracy in the plate longitudinal direction.

On the other hand, if it is a method of connecting the leader material to the short material by welding or the like and extending the length of the rolled material, it is possible to perform rolling while applying tension to the front end portion and the rear end portion of the short material. In addition, it is possible to perform rolling with an ordinary plate coil rolling mill as in Patent Document 1 and avoid the above-described no-tension state.
However, the connecting portion between the short material and the leader material must pass through the deflector roll, guide roll, pinch roll, etc. of the rolling mill. There are concerns about inconvenience such as the occurrence of wrinkles.

  For example, a conventional rolling apparatus 101 (four-high rolling mill) will be described with reference to FIG. 3 schematically illustrating a connecting portion between the short material S and the leader material L during the rightward rolling (black arrow). It is highly possible that B ′ passes through the left deflector roll 107 and wrinkles are generated in the deflector roll 107. Similarly, during leftward rolling (open arrow), the connecting portion A ′ passes through the deflector roll 107 on the right side, and there is a high possibility that wrinkles are generated in the deflector roll 107. If wrinkles occur in the deflector roll 107, the wrinkles are transferred to the rolled material W, and the quality of the rolled material W is degraded.

  In order to avoid such wrinkling, it is possible to take measures such as wrapping non-woven fabric around each roll or performing a curing treatment on the roll surface, but it is currently impossible to expect a certain effect is there. In addition, it may be possible to avoid wrinkling of the rolling roll by preventing the connecting portion from passing through the rolling roll, but if the connecting portion does not pass through the deflector roll, the guide roll, etc., the rolling material is not rolled. The part becomes long and contributes to a decrease in productivity.

  In view of the above problems, the present invention has an object to provide a rolling device and a rolling method for a short material that can reliably roll the short material in rolling using a rolled material in which a leader material is connected to the short material. And

In order to achieve the above-described object, the present invention takes the following technical means.
A rolling device for a short material according to the present invention includes a rolling mill having a pair of work rolls for rolling a rolled material having a connecting portion in which a leader material is connected to the short material, and unwinding for unwinding the rolled material to the rolling mill. A rolling device comprising a reel and a take-up reel that winds up the rolled material rolled by the rolling machine, wherein the rolling material is unwound from the unwinding reel, and a work roll The unwinding reel, the take-up reel and the rolling mill are arranged so that all three positions of the reduction position and the take-up position where the take-up reel takes up the rolled material are arranged on a substantially horizontal line. It is characterized by that.

Preferably, between the work roll and at least one of the take-up reel or the take-up reel, when the connecting portion of the short material and the leader material passes, the connecting portion does not contact the rolling pass line. A separable deflector roll may be provided.
Preferably, between the work roll and at least one of the take-up reel or the take-up reel, when the connecting portion of the short material and the leader material passes, the connecting portion does not contact the rolling pass line. A pinch roll that can be separated is preferably provided.

  Moreover, the rolling method of the short material which concerns on this invention is a rolling mill which has a pair of work roll which rolls the rolling material which has the connection part to which the leader material was connected to the short material, and unwinds a rolling material to the said rolling mill When rolling a short material using a rolling device provided with an unwinding reel and a winding reel that winds up the rolled material rolled by the rolling mill, the rolling material is unwound from the unwinding reel. The unwinding reel and the winding reel are arranged so that all three positions of a certain unwinding position, a roll-down position by a work roll, and a winding position where the winding reel winds up the rolled material are aligned on a substantially horizontal line. A reel and a rolling mill are arranged, and the short material is rolled under a situation where only the work roll is in contact with the short material.

Preferably, a rolling mill having a pair of work rolls for rolling a rolled material having a connection portion in which a leader material is connected to a short material, an unwinding reel for unwinding the rolled material to the rolling mill, and rolling by the rolling mill When rolling a rolled material in which a leader material is connected to a short material using a rolling device having a take-up reel that winds up the rolled material, the following steps (i) to (iii) are performed: It is good to do.
(i) The leading end of the rolled material is wound around the take-up reel from the rolling pass line side, and the trailing end of the rolled material is wound around the unwinding reel from the rolling pass line side.
(ii) After performing the step (i), while the length of the short material is shorter than the interval between the unwinding reel and the take-up reel, the short material Roll.
(iii) After the step (ii), when the length of the short material is longer than the distance between the take-up reel and the take-up reel, the tip of the rolled material is anti-rolled with respect to the take-up reel. Wrap from the pass line side and wind the rear end of the rolled material around the unwinding reel from the anti-rolling pass line side, and then roll the rolled material with deflector rolls arranged on the entry side and the exit side of the work roll. The short material is rolled with the work roll while being supported.

  Preferably, in the step (iii), when the leading end or the trailing end of the rolled material is wound around the take-up reel or the unwinding reel from the counter rolling pass line side, the rolled material is applied to the deflector roll and the deflector roll. When cutting the short material and the leader material in a state where the rolled material is sandwiched between the pinch rolls in a position facing each other and winding the end portion of the short material after cutting around the winding reel or the unwinding reel Good.

  The step (i) described above corresponds to FIGS. 2A to 2B described later. Step (ii) corresponds to the rolling operation in the state of FIG. Step (iii) corresponds to FIGS. 2C to 2E described later. However, it goes without saying that the present invention is not limited to these drawings.

  By using the rolling device and rolling method of the short material of the present invention, it is possible to roll the short material without reducing productivity while reliably suppressing wrinkling on each roll provided in the rolling device. it can.

It is the figure which showed typically the rolling apparatus of this invention. It is a continuous view for demonstrating the rolling method of this invention. It is the figure which showed the conventional rolling apparatus typically.

Hereinafter, embodiments of a rolling apparatus and a rolling method 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 apparatus 1 according to the present invention.
The rolling device 1 includes a rolling mill 2 (four-stage rolling mill), an unwinding reel 3 for unwinding the rolling material W around the rolling mill 2, and a winding for winding the rolling material W rolled by the rolling mill 2. And a reel 4.

The rolling mill 2 is a reverse rolling mill. When rolling rightward (the black arrow in FIG. 1), the reel arranged on the left side of the rolling mill 2 is arranged on the unwinding reel 3 and on the right side of the rolling mill 2. The reel becomes the take-up reel 4. In the case of leftward rolling (the white arrow in FIG. 1), the reel provided on the right side of the rolling mill 2 becomes the unwinding reel 3, and the reel provided on the left side of the rolling mill 2 becomes the take-up reel 4. .
The rolling device 1 of the present embodiment rolls a short rolled material W mainly made of metal such as steel or stainless steel to a plate material or the like, and in particular, rolls the short rolled material W. The “short length” here is one typical example in which the initial length of the rolled material is shorter than the distance between the take-up reel 4 and the unwind reel 3 arranged on the upstream and downstream sides of the rolling mill 2. . In addition, it includes cases where the length of the rolled material is longer, and includes cases where the rolled material cannot be sufficiently wound around the take-up reel and the unwinding reel, or the length is such that an appropriate tension cannot be applied even if it can be wound. As a specific length, a rolled material having a total length of about 1 meter to about 20 meters is suitable for the present invention, but is not limited to this length.

When rolling such a short rolled material W (short material S), another introduction long plate (leader material L) is connected to the front end portion and the rear end portion of the short material S by welding or the like. The rolled material W is longer as a whole, and the rolled material W is stretched from the unwinding reel 3 to the take-up reel 4 and coil-rolled.
Hereinafter, the detail of the rolling device 1 of this embodiment is demonstrated.

  As shown in FIG. 1, the rolling mill 2 provided in the rolling apparatus 1 is a four-high rolling mill, and has work rolls 5 and 5 arranged in a pair of upper and lower sides. Each work roll 5 is supported by a pair of upper and lower backup rolls 6 and 6. The work roll 5 and the backup roll 6 are rotatably supported by the mill housing via a shaft support portion incorporating a bearing and the like. The work roll 5 is driven by a drive motor.

In addition, the rolling mill 2 of this embodiment is not limited to four stages. A two- or six-high rolling mill may be used, or a cluster-type multi-high rolling mill having 12 to 20 stages may be used. Further, the roll drive is not limited to the work roll but may be an intermediate roll or a backup roll.
The rolled material W passes between the pair of work rolls 5 and 5 from one side to the other side (or from the other side to one side) and is rolled in the thickness direction by the work rolls 5 and 5. An unwinding reel 3 for unwinding the rolled material W including the short material S and a take-up reel 4 for winding the rolled material W after rolling are provided on the entry side and the exit side of the work roll 5, respectively. The take-up reel 3 and the take-up reel 4 can apply necessary tension to the rolled material W by setting the take-up / winding tension. That is, it has a function as a tension reel.

  A deflector roller 7 is installed between the rolling mill 2 and the unwinding reel 3 (left reel). As shown in FIG. 3, in a conventional general plate rolling mill, the pass line is kept horizontal by the left and right deflector rollers 107 and the work roll 105 of the rolling mill 102, and the rolling material W is wound around the deflector roller 107. It is wound around a take-out reel 103 and a take-up reel 104.

Further, in a general plate rolling machine, a pinch roll 8 may be provided above the deflector roll 7 with the rolled material W interposed therebetween so that the rolled material W can be conveyed.
A deflector roll 7 and a pinch roll 8 having a similar configuration are also provided between the rolling mill 2 and the take-up reel 4 (right reel).
The characteristic configuration of the present embodiment includes a position P1 (unwinding position) where the rolled material W is unwound from the unwinding reel 3, a reduction position P2 (rolling position) by the work roll 5, and the take-up reel 4 is a rolled material. That is, all three points of the position P3 (winding position) for winding W are arranged on a substantially horizontal line. Here, “substantially horizontal line” does not mean horizontal with geometrical strictness. It means a situation that can be regarded as horizontal in comparison with a rolling pass line in a general multi-high rolling mill 101 shown in FIG. In other words, in the present invention, the rolling pass line does not need to be maintained strictly level, and may be inclined at a slight angle from the horizontal line, or may be slightly convex upward or convex downward. Good.

  Further, in the rolling apparatus 1 of the present embodiment, at the time of rolling, the deflector roll 7 is lowered and the pinch roll 8 is also raised to separate these rolls from the rolling pass line. Avoid contact with the rolled material W. By setting it as such a structure, the short material S can be rolled, suppressing the wrinkle to each roll 7 and 8 with which the rolling apparatus 1 was equipped reliably.

A series of usage modes when rolling the short material S using the rolling apparatus 1 described above will be described with reference to FIG. 2 which is a continuous view for explaining the rolling method of the present invention.
First, the leader material L is connected to the front-end | tip part and rear-end part of the short material S which is rolling object by welding etc., and the rolling material W in which the full length was extended is prepared.
First, as shown in FIG. 2A, this rolled material W is fed out and passed between work rolls so as to reach the take-up reel 4 (right reel). When the rolled material W is fed out, the rolled material W or the leader material L is sandwiched between the deflector roll 7 and the pinch roll 8 and the pinch roller 8 is rotated. However, when the connecting portions A and B (that is, the welding points) of the short material S pass through the left pinch roll 8 and the deflector roll 7, the left pinch roll 8 is raised and the deflector roll 7 is lowered to the right side. When passing the pinch roll 8 and the deflector roll 7, the right pinch roll 8 is raised and the deflector roll 7 is lowered so that the connecting portions A and B do not come into contact with each roll. Moreover, when the connection parts A and B of the short material S pass between the pair of work rolls 5, the interval between the work rolls 5 is widened or the work roll 5 is not in the line. Thereafter, after the tip of the rolled material W reaches the take-up reel 4, the rolled material W is wound around the take-up reel 4 from the upper side (rolling pass line side).

After that, as shown in FIG. 2B, the rear end of the rolled material W is wound around the unwinding reel 3 (left reel) from the upper side (rolling pass line side). After that, the work roll 5 has a reduced position (roll gap amount) and is subjected to reverse rolling, whereby the thickness of the short material S is gradually rolled into a thin plate material.
At this time, the raised state of the pinch roll 8 and the lowered state of the deflector roll 7 are maintained so that the connecting portions A and B do not contact the rolls 7 and 8. The connecting portion A between the leading end of the short material S and the leader material L is positioned on the right side of the work roll 5, and the connecting portion B between the rear end portion of the short material S and the leader material L is the work roll 5. Position it on the left side. When the rolled material W is fed to the right by reverse rolling, the short material S can be rolled until the connection portion B is in the immediate vicinity of the work roll 5. When the rolled material W is fed leftward, the short material S can be rolled until the connection portion A is in the immediate vicinity of the work roll 5.

  As shown in FIG. 2C, when the length of the short material S becomes relatively long, the leader material L and the short material S are separated at the connection portion B, and the rear end portion of the short material S is unwound. The roll 3 is wound from below (from the counter-rolling pass line side). In this case, P1 'is the winding position of the unwinding roll 3. In order to prevent the short material S from becoming free (tensile state) at the time of separation, the pinch roll 8 on the side close to the unwinding roll 3 is lowered, the deflector roll 7 is raised, and both rolls 7 8 and 8 so that the leader material L and the short material S are cut at the short material S portion in the vicinity of the connecting portion B, and the leader and the short material can be easily separated. It is preferable because sometimes the work roll is pulled to prevent the work roll from being damaged.

  As shown in FIG. 2D, when the rolling further progresses and the short material S becomes a plate material and becomes long, the leader material L and the short material S are separated from each other at the short material S portion in the vicinity of the connecting portion A, and the short material is obtained. The end of the material S is wound around the winding roll 4 on the lower side. In this case, P2 'is the winding position of the winding roll 4. Note that the short material S is sandwiched between the pinch roll 8 and the deflector roll 7 on the side close to the winding roll 4 in order to prevent the short material S from becoming free (no tension) at the time of separation.

Thereafter, as shown in FIG. 2 (e), reverse rolling is performed on the unwinding reel 3 and the winding reel 4 from the lower side (reverse rolling pass line side), and the short material S is rolled until it becomes a plate material. To do. After the short material S becomes a plate material having a predetermined thickness, the coil is unloaded from the left or right take-up reel 4 by a coil car or the like (not shown) and sent as a product to the next process.
By performing the rolling described above, the connecting portion between the short material S and the leader material L existing in the rolled material W is not in contact with the deflector roll 7, the guide roll, the pinch roll 8, and the like, and the connecting portion is a rolling mill. It becomes possible to perform reverse rolling until it is located immediately before the rolling roll.

  Therefore, it is possible to reliably avoid inconveniences such as wrinkling on the roll and generation of wrinkling of the rolled material W due to the wrinkled roll, and coil rolling can be performed by applying an appropriate tension in each pass. Therefore, compared to sheet rolling, which is usually performed by rolling a short material, high-speed and high-pressure rolling is possible, productivity is improved, and quality such as improvement in yield at the front and rear ends and sheet thickness accuracy is also high quality. There is a big advantage that a simple product can be made.

  The rolling apparatus 1 of the present embodiment described above, that is, the rolling reel W is arranged so that the three points of the unwinding position P1, the rolling position P2, and the winding position P3 of the rolling material W are aligned in a substantially straight line in the horizontal direction. By using the rolling device 1 in which other rolls (a deflector roll 7, a guide roll, etc.) are not in contact with each other between the work roll 5 and the work roll 5, the short material S existing in the rolled material W and the leader material L can be connected. The part does not come into contact with the deflector roll 7 or the like, and it becomes possible to perform reverse rolling until the connecting part is located immediately before the rolling roll of the rolling mill, and the rolled material W can be rolled at high speed and high pressure. Productivity is improved, and a product with high quality such as improvement in yield at the front and rear ends and plate thickness accuracy can be achieved.

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, the form of unwinding / winding with respect to the unwinding reel 3, the winding reel 4, that is, the left reel and the right reel is not limited.

  That is, both the left reel and the right reel may be arranged above the rolled material instead of below, as in the above embodiment, so that the lower reel and the lower reel are taken up. In this case, the position of the deflector roll and the pinch roll may be reversed upside down. Further, the left reel may be lower unwinding / lower winding, and the right reel may be upper unwinding / upward winding. The left reel may be the upper winding / upwinding, and the right reel may be the lower winding / lower winding.

Further, when the rolled material is relatively long, only the left and right lead materials may be connected.
Furthermore, there is no restriction | limiting in particular in the shape and number of auxiliary rolls, such as the deflector roll 7 and the pinch roll 8, What is necessary is just to install suitably as needed.
In addition, the rolled material may be taken up and taken out when a predetermined plate thickness is reached, or a rewinding reel (not shown) may be installed to take out the coil from the rewinding reel.

DESCRIPTION OF SYMBOLS 1 Rolling apparatus 2 Multistage rolling mill 3 Unwinding reel 4 Rewinding reel 5 Work roll 6 Backup roll 7 Deflector roll 8 Pinch roll L Leader material S Short material W Rolled material P1 Unwinding position P2 Rolling position P3 Winding position

Claims (6)

A rolling mill having a pair of work rolls for rolling a rolled material having a connecting portion in which a leader material is connected to a short material, an unwinding reel for unwinding the rolled material to the rolling mill, and rolling rolled by the rolling mill A rolling device comprising a take-up reel for winding the material,
All three positions of the unwinding position where the rolled material is unwound from the unwinding reel, the reduction position by the work roll, and the winding position where the winding reel winds the rolled material are all substantially horizontal lines. A rolling device for short materials, wherein the unwinding reel, the winding reel, and a rolling mill are arranged so as to be lined up.   Separating from the rolling pass line so that the connecting portion does not come into contact when the connecting portion of the short material and the leader material passes between the work roll and at least one of the take-up reel or the take-up reel. The short material rolling apparatus according to claim 1, further comprising a deflector roll.   Separating from the rolling pass line so that the connecting portion does not come into contact when the connecting portion of the short material and the leader material passes between the work roll and at least one of the take-up reel or the take-up reel. The short material rolling apparatus according to claim 1, further comprising a pinch roll. A rolling mill having a pair of work rolls for rolling a rolled material having a connecting portion in which a leader material is connected to a short material, an unwinding reel for unwinding the rolled material to the rolling mill, and rolling rolled by the rolling mill When rolling a short material using a rolling device equipped with a take-up reel for winding the material,
All three positions of the unwinding position where the rolled material is unwound from the unwinding reel, the reduction position by the work roll, and the winding position where the winding reel winds the rolled material are all substantially horizontal lines. Arrange the unwinding reel, the take-up reel and the rolling machine so that they line up on top,
A method for rolling a short material, comprising: rolling the short material in a state where only a work roll is in contact with the short material. A rolling mill having a pair of work rolls for rolling a rolled material having a connecting portion in which a leader material is connected to a short material, an unwinding reel for unwinding the rolled material to the rolling mill, and rolling rolled by the rolling mill When rolling a rolled material in which a leader material is connected to a short material using a rolling device provided with a take-up reel for winding the material, the following steps (i) to (iii) are performed. A rolling method of a short material characterized.
(i) The leading end of the rolled material is wound around the take-up reel from the rolling pass line side, and the trailing end of the rolled material is wound around the unwinding reel from the rolling pass line side.
(ii) After performing the step (i), while the length of the short material is shorter than the interval between the unwinding reel and the take-up reel, the short material Roll.
(iii) After the step (ii), when the length of the short material is longer than the distance between the take-up reel and the take-up reel, the tip of the rolled material is anti-rolled with respect to the take-up reel. Wrap from the pass line side and wind the rear end of the rolled material around the unwinding reel from the anti-rolling pass line side, and then roll the rolled material with deflector rolls arranged on the entry side and the exit side of the work roll. The short material is rolled with the work roll while being supported. In the step (iii), when the front end or the rear end of the rolled material is wound around the take-up reel or the unwind reel from the counter-rolling pass line side,
In a state where the rolled material is sandwiched between the deflector roll and a pinch roll at a position facing the deflector roll via the rolled material, the short material and the leader material are cut,
6. The method for rolling a short material according to claim 5, wherein an end portion of the cut short material is wound around the take-up reel or the unwinding reel.

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