JP2006334647A - Rolling method and rolling equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling method and rolling equipment by which the loss of a rolled stock generated in the longitudinal direction is effectively reduced and which are also preferable in respect of the cost of equipment and operating efficiency. <P>SOLUTION: The rolled stock A is rolled with a rolling mill 1 by using the rolling mill 1 and winding reels 3, 4 arranged on the inlet and outlet sides of the mill and performing reciprocating passes. Leader pieces X, Y which are held with the winding reels 3, 4 are joined to the end parts of the rolled stock A, the rolled stock A is rolled with the rolling mill 1 without rolling the leader pieces X, Y and joined places Xc, Yc to the leader pieces while imparting tension from the winding reels 3, 4 through the leader pieces X, Y even in the neighborhoods of the end parts. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The invention according to the claims relates to a rolling method and rolling equipment for rolling by rolling a rolled material (such as a strip) in a reciprocating manner with respect to a rolling mill (reversible rolling mill). Specifically, the longitudinal direction of the rolled material It is intended to reduce the loss that occurs in

  In general, strip rolling (Leverus rolling) using a reversible rolling mill is performed as shown in FIGS. As the equipment, one having an unwinder (payoff reel) 2 on the entry side of the rolling mill 1 and having winders 3 and 4 on the entry side and the exit side, respectively, is used. In addition to providing the cutting machine 14 for the strip A near the rolling mill 1, a strip press 15 is often arranged.

Using such rolling equipment, first, the strip A is unwound from the unwinding machine 2 as shown in FIG. 10 (a) and passed through the rolling mill 1, and as shown in FIG. 10 (b), on the exit side (tip side) of the strip A. When the end portion is held by being wound on the delivery side winder 4 by 2 to 3 rolls, the rolling machine 1 performs rolling down to a predetermined position, and the winder 4 and the rolling machine 1 are used to strip A. After the tension is applied, rolling of the first pass is started. When the rolling of the first pass proceeds and the end portion of the strip A exits from the unwinder 2 as in (c), the strip press 15 is used to rub against the strip A. Rolling is continued while applying tension by braking, and when it advances a little, the inlet side end is held by the inlet side winder 3 according to the same (d).
When the entrance side winder 3 holds the end part by winding 2 to 3 or the like, the second pass is started as shown in FIG. 11 (e), and the exit side winder as shown in FIG. 11 (f). Rolling is advanced until the number of turns on 4 is small (about 2-3 turns). Even in this pass, tension is applied to the strip A by the action of the winder 4 during rolling.
11 (e) and 11 (f) are alternately displayed, and the rolling is repeated by repeating odd-numbered and even-numbered passes, and after a predetermined number of passes for reaching the predetermined thickness of strip A, FIG. The strip A is taken out as a coil as in (g) and (h). The above (g) and (h) are examples in which the coil CF1 is taken out from the entry side winder 3 after an even number of passes. The ends of the strip A on both sides in the longitudinal direction (that is, the entry side and the exit side) include a portion (off-gauge portion) that is not rolled because it is not rolled, but the exit end is the same as in (g) Cut with the cutting machine 14, and remove from the take-up winder as the off-gauge portion Ay according to the same (h) and dispose of it. On the other hand, the off-gauge portion at the end on the entry side remains on the inner circumference of the coil CF1 taken out from the entry-side winder 3, and is disposed on the subsequent line or disposed on the end user. As shown in the drawing, the coil CR2 of the strip for the next rolling is held on the unwinder 2, and the next rolling is started simultaneously with the recovery of the preceding coil CF1.
Although illustration is omitted, when the coil is recovered from the output side winder 4 after an odd number of passes, the off-gauge portion near the end of the input side is cut by the cutting machine 14 and the input side winder is cut. Wind up around machine 3, remove and dispose.

  Since the off-gauge portions generated at the ends on both sides in the longitudinal direction of the rolled material become a loss of the rolled material as described above, it is advantageous in terms of yield to make it as short as possible. Therefore, various ideas have been made so far to reduce the loss.

  FIG. 12 shows an example (pinch roll method) in which pinch rolls 7 and 8 are respectively arranged between the rolling mill 1 and the winding machines 3 and 4 on its entry and exit sides. Even when the end portion of the strip A is not held by the winder 3 or 4, the roll of the rolling mill 1 is rolled down while tension is applied to the strip A using the pinch roll 7 or 8.

FIG. 13 is an example described in Patent Document 1 below. When the detector 19 disposed near the rolling mill 1 detects the tip Ae of the strip A, the roll gap of the rolling mill 1 is immediately closed and a rolling load is applied. A tension is applied to the strip A after the front end portion Ae is held by the output side winder 4, but the strip A is rolled without tension. Even when the tail end portion of the strip Ae leaves the entry side winder 3, the roll gap of the rolling mill 1 is kept closed and rolling is continued. In other words, in this example, since the end of the strip A is not held by the winders 3 and 4 and thus the strip A is not subjected to any tension, rolling is performed, so that the off-gauge portions generated at the ends on both sides Shorter.
Japanese National Patent Publication No. 11-500065

FIG. 14 is an example in which a coil preparation section CP is arranged adjacent to a rolling section CRM composed of a rolling mill 1 and winding machines 3 and 4 on both sides of the rolling mill 1. is there. In the coil preparation section CP, the ends of the strip A are welded together to lengthen the strip A, or the dummy material (leader piece) Y is welded to both ends of the strip A, and the roll of the rolling mill 1 Grind the weld to make it smooth. If the strip A is made long, the ratio (weight ratio, off-gauge rate) of the off-gauge portion formed near both ends becomes small. Moreover, if the leader piece Y is welded to both ends, the loss generated from the rolled material as a raw material is reduced. In the example of FIG. 14, as the winder 3 disposed on the side close to the preparation section CP (entry side), a two-shaft type that can be switched in position is used.
Japanese Patent Laid-Open No. 11-342402

  When the strip A is rolled by the method shown in FIGS. 10 and 11, off-gauge portions are generated at both ends in the longitudinal direction of the strip A, and the material is lost as described above. Further, the off-gauge portion Ay needs to be cut and disposed as shown in FIG. 11 (h), so that it takes a considerable amount of time for banding or unloading to prevent it from being unwound. And labor loss.

  In the case of the method shown in FIG. 12, the off-gauge portions at both ends are shortened, but it is necessary to squeeze the strip A fairly strongly with the pinch rolls 7 and 8, so there is a risk that the strip A will be deformed inappropriately.

  The method shown in FIG. 13 is one in which the vicinity of both ends of the strip A is rolled without tension, so that the vicinity of the strip A cannot always be rolled well. That is, there is a risk that the feeding of the strip A becomes unstable, such as meandering, or the rolling load increases and the accuracy of the shape and thickness of the strip A deteriorates. If the accuracy such as thickness is poor, the portion cannot be used as a product, and the loss reduction benefit may not be obtained. In addition, even if the loss length is shortened, the tensionless rolling needs to be performed at a low speed, so that the productivity is unavoidably reduced.

  Furthermore, since the example of FIG. 14 is provided with the coil preparation section CP adjacent to the original rolling equipment, the equipment cost is high and a wide (long) installation area is required. Regarding the welding of the end portions of the strip A or between the strip A and the leader piece Y, since the grinding process is performed so as not to bend the roll of the rolling mill 1, it is necessary to employ a flash butt welding method or the like. As a result, the cost of the welding machine increases and the time required for welding increases.

  The invention according to the claims aims at solving such problems, and effectively reduces the loss generated in the longitudinal direction of the rolled material, and also provides a rolling method and rolling equipment that are preferable in terms of equipment cost and work efficiency. It is to provide.

The rolling method according to the claims is a rolling mill (one or a plurality of stands. That is, it refers to a group of at least one rolling mill, regardless of the type, number of rolls, etc.) and its inlet and outlet sides. A rolling method in which a rolled material is rolled with a rolling mill by using reciprocating passes (odd or even passes),
-Join the leader piece held by the winder (winding machine on the entry side or exit side or both sides) to the end of the rolled material (end side on the entry side, exit side or both sides),
The above-mentioned rolled material is rolled by the above rolling mill without rolling the leader piece and the joining portion with the leader piece while applying tension from the winder through the leader piece even near the end portion. To do.
The “entry side” refers to the side where the coil is first attached and the rolled material is unwound, and the “exit side” refers to the side opposite to the entry side across the rolling mill. The term “joining” as used herein refers to joining by various means including welding, various types of bonding, sewing, hooking, bending, and the like.

In this rolling method, since the leader piece is joined to the longitudinal direction end portion (that is, the portion difficult to roll by applying tension) of the rolled material, many portions of the rolled material can be rolled, Loss can be reduced. In addition, since it rolls while applying tension from the winder using a leader piece, the feed of the rolled material is stable, such as no meandering, the product shape is good, the thickness accuracy is high, and there is no need for low-speed processing The following advantages are brought about. Prior to rolling, it is not necessary to perform a difficult task of sending a rolled material with a considerable thickness to the winder and holding the end of the rolled material on the winder. Therefore, there is an advantage that the preparation time before the start of rolling is shortened and the productivity is improved.
Since the leader piece and the joining portion between the leader piece and the rolled material are not rolled, there is no risk of wrinkles on the roll of the rolling mill or the like regardless of the surface state of the leader piece or the joining portion. Therefore, it is possible to reduce the cost of the leader piece, and it is possible to employ a low-cost joining means between the leader piece and the rolled material, and it is not necessary to grind the surface of the joining portion. In other words, the cost required for the preparation and handling of the leader piece is greatly reduced.

For the rolling method of the invention, the leader piece is separated from the rolled material before and / or at the end of the final pass, and the leader piece is used repeatedly (that is, held in the winder as described above). It is preferable to join the end of the rolled material).
In this way, the cost required for the leader piece can be reduced, and rolled material that has been rolled and wound in a coil shape can be delivered to the next process without attaching the leader piece. There is no need to remove pieces.
It should be noted that the “final pass” may of course include an odd-numbered pass toward the exit-side winder or an even-numbered pass toward the entry-side winder. In addition, in the “separation” here, in addition to unbonding the leader piece and the rolled material, the leader piece or the rolled material is cut and separated in the vicinity of the joined portion (the portion adjacent to the joined portion, etc.). It is also included.

Join the leader piece to the exit end of the rolled material on the exit side of the rolling mill, and make the reciprocating pass and then the even-numbered pass to the entrance side winder as the final pass, at the end of the final pass, It is particularly preferable to separate the leader piece joined to the outlet end.
For example, as shown in FIGS. 1 (b) and 1 (c), the leader piece Y is joined to the exit end of the rolled material A, and even-numbered passes toward the entry-side winder 3 as shown in FIG. 5 (a). At the end of the final pass, the leader piece Y joined to the outlet end is separated.
If it does so, the loss which arises in the exit side edge part vicinity of a rolling material reduces, and there is an effect that efficient operation can be performed. The leader piece joined to the exit side end should be always held by the exit side winder, and used while being joined to the exit side end of the next rolled material while remaining on the winder. Because it can be done. That is, since it is not necessary to remove the leader piece from the output side winder or to hold it again on the winder (winding shaft), this is extremely advantageous in terms of operation efficiency. This means that, after joining the leader piece to the exit end, and when the final pass is the odd number of passes toward the exit side winder, the leader piece is not attached to the rolled material. In contrast to repeated use, the leader piece must be removed from the exit winder. In addition, the example of FIGS. 1-7 shall join a leader piece to the outgoing side edge part and incoming side edge part of a rolling material, and also when making an even number of times the last pass and making an odd number of times the last pass. As shown, there is no need to remove the leader piece from the take-up winder if the leader piece is joined only to the exit end of the rolled material and rolling is performed with an even number of passes as the final pass. The above-mentioned advantages are always realized.

Alternatively, the leader piece is joined to the entry side end of the rolled material at the entry side of the rolling mill, and after making a reciprocating pass, the odd-numbered pass to the take-up winder is taken as the final pass, and the end of the final pass Sometimes, it is also possible to separate the leader piece joined to the entry end.
For example, as shown in FIGS. 2 (c) and 2 (d), the leader piece X is joined to the entrance side end of the rolled material A, and the odd number of times toward the exit side winder 4 as shown in FIG. 6 (d). At the end of the final pass, which is a pass, the leader piece X joined to the entrance end is separated.
If it does so, not only the loss which arises near the entrance side edge part of a rolling material will decrease, but efficient operation will be attained. The leader piece joined to the entry side end should be always held by the entry side winder, and used while being joined to the entry side end of the next rolled material while remaining on the winder. Because it can. That is, it is not necessary to remove the leader piece from the inlet side winder or to hold it again on the winder (winding shaft), which is extremely advantageous in terms of operation efficiency. In addition, the example of FIGS. 1-7 shall join a leader piece to the outgoing side edge part and incoming side edge part of a rolling material, and may make an even number of times a final pass and may make an odd number of times a final pass. However, it is not necessary to remove the leader piece from the take-up winder if the leader piece is joined only to the inlet end of the rolled material and rolling is always performed with the odd number of times as the final pass. The advantages described above are always realized.

Using both of the above methods, the leader piece is joined to the exit end of the rolled material on the exit side of the rolling mill, and the leader piece is joined to the entrance end of the rolled material on the entry side of the rolling mill. A rolling method is also preferable in which the above-described leader pieces joined to the exit end and the entrance end are separated after starting and at the end and before the end of the final pass.
In this method, since the leader piece is joined to the end portions on the entry side and the exit side of the rolled material to perform rolling, off-gauge portions are reduced on both sides in the longitudinal direction of the rolled material, and the generated loss is extremely effective. Reduced. In this case, in order to repeatedly use the leader piece without attaching the leader piece to the rolled rolling material (coil), either the exit side or the entry side before the start of the final pass. One piece of leader must be removed from the winder. That is, when the even-numbered pass is the final pass, it is an entry side winder (see, for example, FIGS. 4A to 4C), and when the odd-numbered pass is the final pass, the output side winder is used. (See, for example, FIGS. 6 (a)-(c)), it is necessary to remove the leader piece (and then attach it to the winder).

The joining between the leader piece and the rolled material is advantageously performed by spot welding.
Spot welding, unlike the flash butt welding described above, requires less equipment costs and increases the production efficiency because the time required for welding is short. It is more efficient if spot welding is performed simultaneously at a plurality of locations. In addition, in the rolling method of the invention, since the joint portion between the leader piece and the rolled material is not rolled, there is no fear that the rolls of the rolling mill will be wrinkled even if spot welding is performed and finishing such as grinding is not performed at all.

  The rolling equipment according to the claims is the rolling equipment provided with a winder on the entry side and the exit side of the rolling mill (one or a plurality of stands as described above, regardless of the type or number of rolls). A joining machine capable of joining the rolled material and the leader piece and a separator for separating the leader piece from the rolled material are arranged between the winder on the side, the exit side or both sides and the rolling machine. And The meanings of “joining” and “separation” are as described above.

According to this rolling equipment, each of the above rolling methods is carried out by using a winder and a rolling machine on both sides after joining the leader piece held by one of the winders to the end of the rolled material. can do. If the above-mentioned joining machine and separator are arranged between the output side winder and the rolling machine, or between the inlet side winder and the rolling machine, or between the winder and the rolling machine on both sides. This is because, as described above, it is possible to join the leader piece to any one end of the rolled material and to separate the leader piece at the end of the final pass or the like.
In this rolling equipment, the joining machine and the separator are arranged in the rolling equipment itself, and another coil preparation section or the like is not provided and arranged there. The feature of this rolling equipment is that it can be rolled without reducing productivity because it can adopt an advantageous method of use while joining the leader piece to the rolled material in the same rolling equipment. . Since no separate coil preparation section or the like is provided, the entire necessary equipment can be configured compactly, and the equipment cost can be reduced.

As said joining machine, it is good to arrange | position the spot welding machine which can join several places of a board width direction simultaneously.
If it does so, the above-mentioned rolling method can be implemented and the installation cost required as a joining machine can be reduced. Moreover, productivity can be improved because the time required for welding is short. Since a device capable of simultaneously joining a plurality of locations in the plate width direction is arranged, it is not necessary to move the welding machine in the plate width direction to perform welding a number of times, and the welding time is further shortened, which is more efficient.

For the winder on the entry side or the exit side or on both sides of the rolling mill, a processing device that can once remove the leader piece on the winder from the winder and hold it again on the winder is attached. preferable.
When using the above rolling equipment, in order not to attach the leader piece to the rolled coil and to use the leader piece repeatedly, remove the leader piece from either winder before the start of the final pass. It may have to be removed. That is, as described above, a) a case where a leader piece is joined to the exit end of the rolled material, and the leader piece is separated at the end of the final pass with the even-numbered pass as the final pass; Remove the leader piece from one of the winders, except when joining the leader piece to the side edge and separating the leader piece at the end of the final pass with the odd number of passes as the final pass. It needs to be attached to the winder again.
When the processing apparatus is attached as described above, such removal and reattachment of the leader piece can be easily performed. That is, for example, the processing apparatus having the reference numerals 17 and 18 in FIG. 4 is arranged, and the leader piece X or Y on the winder 3 or 4 is temporarily removed (FIGS. 4A to 4C or 6A). ) To (c)) and then reattaching to the winder 3 or 4 (FIG. 5 (g) or FIG. 7 (f)), the even-numbered or odd-numbered pass is the final pass. Even in the case of rolling, rolling with less loss using the leader piece can be performed smoothly. 4 to 7 and the like include a main body arm tilting mechanism, a main body arm shifting mechanism perpendicular to the drawing sheet, and a holder mechanism clamping mechanism.

Instead of attaching a processing device as described above, as a winding machine on the entry side or exit side of the rolling mill or on both sides, it has a plurality of winding shafts (mandrels) and switches the position of the winding shaft It is good to arrange what can be used.
In this case, when the leader piece is separated before the start of the final pass, the separated leader piece and the rolled material can be wound on each winding shaft of a winder that is used by switching. When the leader piece is used again, it is not necessary to hold it again on the winder, and it is sufficient to unwind from the same winding shaft whose position is changed, so that handling becomes extremely easy.

  According to the rolling method which concerns on a claim, the loss which arises in the longitudinal direction of a rolling material can be decreased. In addition to the stable feeding of the rolled material, there are advantages that a rolled product with excellent shape and thickness accuracy can be obtained and that the production efficiency is high. Since the leader piece and the joint portion between the leader piece and the rolled material are not rolled, there is an advantage that the cost required for the preparation and handling of the leader piece is greatly reduced.

  According to the rolling equipment concerning a claim, the above-mentioned rolling method can be carried out smoothly, and the above-mentioned effect is brought about. Further, since no separate coil preparation section or the like is provided, the entire necessary equipment can be configured compactly, which is advantageous in terms of equipment cost.

  Embodiments relating to the embodiment of the invention are introduced in FIGS. These drawings are conceptual diagrams showing a rolling method and rolling equipment for reducing the off-gauge portion.

  As shown in FIG. 1 (a) and the like, this rolling equipment is provided with an unwinder (payoff reel) 2 on the inlet side of the cold rolling mill 1, and on the inlet side and the outlet side, respectively, 4 is arranged. A joining machine (spot welder) that joins a leader piece (leader strip) X to the end of the rolled material (strip) A by spot welding at a plurality of locations between the winding machine 3 on the entry side and the rolling mill 1. ) 11 and a separator 13 that separates the rolled material A and the leader piece X in the vicinity of the joint. Similarly, a joining machine 12 that joins a leader piece (leader strip) Y to the end of the rolled material A by spot welding at a plurality of locations between the take-up winder 4 and the rolling mill 1, A separator 14 for separating the rolled material A and the leader piece Y is provided in the vicinity of the joining portion. Also, in the vicinity of the winding machines 3 and 4 on the entry side and the exit side, the small coils of the leader pieces X and Y wound on the winding shafts of the winding machines 3 and 4 are once removed and then restored to the original. Small coil processing devices 17 and 18 that can be held on the winding shaft are arranged. In addition, as shown in FIG. 2, a strip press 15 is provided between the rolling mill 1 and the inlet-side separator 13, and a straightening machine 5 for the rolled material is provided at the tip of the unwinding machine 2. .

  1 (a) to 1 (d), 2 (e) to (h), and 3 ((i) to (k)) show a rolled material from a coil (hot coil) CR1 mounted on the unwinder 2. A procedure of unwinding A and lever rolling the rolled material A between the rolling mill 1 and the winding machines 3 and 4 is shown.

First, FIG. 1A shows an initial state in which the rolled material A starts to be unwound from the unwinder 2. Each of the winding machines 3 and 4 on the entry side and the exit side holds the leader pieces X and Y, respectively, and sends the end portion (the end portion on the side joined to the rolling material A) toward the rolling mill 1. deep.
When the rolled material A is fed in a state where the rolls of the rolling mill 1 are opened, and its end (exit end) reaches the position of the joining machine 12 as shown in FIG. 1 is overlapped on the end portion of the leader piece Y which has been unwound from, and both are spot-welded by the joining machine 12 as shown in FIG.
Thereafter, the joint Yc by spot welding is returned to the vicinity of the rolling mill 1 as shown in FIG. 1 (d), where the roll of the rolling mill 1 is closed and the first pass rolling is started. In the rolling, the rolled material A is squeezed by the rolling mill 1 from a location very close to the joining location Yc as shown in FIG. 1 (d) so as not to roll the leader piece Y and the joining location Yc. The process is performed while applying tension to the rolled material A.

  When the tail end of the rolled material A comes off from the unwinder 2 as shown in FIG. 2 (e) in the final stage of rolling in the first pass, a tension is generated in the rolled material A by using a strip press 15. Continue rolling. Then, as shown in FIG. 2 (f), the tail end is cut by the cutting machine 5, and the tail end (entrance end) after the cut is sent to the position of the joining machine 11. On the other hand, by sending out the leader piece X from the entry side winder 3, the tip of the leader piece X reaches the position of the same joining machine 11 as shown in FIG. After the rolled material A and the leader piece X are overlapped, the leader piece X is joined to the entrance end portion of the rolled material A using the joining machine 11 as shown in FIG.

  The remaining rolling is continued while applying tension by the entrance side winder 3, and rolling is performed until the joint Xc between the rolled material A and the leader piece X reaches the vicinity of the rolling mill 1 as shown in FIG. When proceeding, the rolling of the first pass is finished. In the even-numbered pass such as the second pass, the rolled material A is sent and rolled down by the rolling mill 1 while applying the tension by the output side winder 4, and as shown in FIG. And the leader piece Y is performed until the joining portion Yc reaches the vicinity of the rolling mill 1. The odd-numbered passes such as the third pass are performed while applying tension to the rolled material A in the same manner as described above until the joining point Xc reaches the vicinity of the rolling mill 1 again as shown in FIG. By repeating the odd-numbered and even-numbered passes in this way, reciprocating (lever) rolling is performed until the rolled material A has a predetermined thickness.

  4 (a) to 4 (d) and FIGS. 5 (e) to 5 (h) are conceptual diagrams showing work when rolling of a certain rolled material A is finished with an even-numbered pass as a final pass.

Before starting the final pass that is the even number, first, as shown in FIG. 4A, the leader piece X and the rolled material A are separated by the separator 13 on the entry side (for example, the leader near the joint Xc). Cut piece X). And the leader piece X is wound up by the entrance side winder 3, and it is made into a small coil, and it is made from the winder 3 by the entrance side small coil processing apparatus 17 like FIG.4 (b) * (d). Pull out and hold outside the winder 3. The small coil processing device 17 swings and displaces around a support shaft 17a and can grasp the small coil of the leader piece X by an openable holder 17b, and the whole can move in a direction perpendicular to the drawing sheet. is there. The small coil is extracted from the winder 3 by swinging from the standby position to the functional position, opening and closing, grasping the small coil, and moving in a direction perpendicular to the paper surface. In addition, the small coil can be held on the winder 3 again by operating in the opposite manner.
On the entrance side winder 3 from which the small coil of the leader piece X is extracted, the entrance side end portion of the rolled material A is held as shown in FIG. Do. The rolling is performed while applying tension to the rolled material A until the joining portion Yc between the outlet end and the leader piece Y reaches the vicinity of the rolling mill 1 as shown in FIG.

When the joining point Yc reaches the separator 14 in the vicinity of the rolling mill 1, the rolling mill 1 is opened and the leader piece Y and the rolled material A are separated by the separator 14 as shown in FIG. The leader piece Y is cut in the vicinity of the location Yc). After that, the rolled material A is wound up as a coil CF1 by the entry side winder 3, and is discharged as a product as shown in FIGS. 5 (f) and 5 (g). The coil CF1 is hardly accompanied by leader pieces X and Y.
At this time, a new rolled material A is unwound from the unrolled hot coil CR2 newly prepared on the unwinding machine 2, and rolling is started as shown in FIG. While the entrance side winder 3 is not yet used for the new rolled material A, the leader piece X is placed on the winder 3 by a small coil processing device 17 as shown in FIGS. It is good to hold | maintain and to send out a front-end | tip part to the rolling mill 1 side.

  On the other hand, if the rolling of the rolled material A is finished with the odd-numbered pass as the final pass, the final pass is performed according to FIGS. 6 (a) to (d) and FIGS. 7 (e) to (g).

In that case, before the start of the final pass, first, as shown in FIG. 6 (a), the leader piece Y and the rolled material A are separated by the separator 14 on the exit side (for example, the leader piece Y in the vicinity of the joint Yc). Cut). Then, the leader piece Y is taken up by the take-up winder 4 to form a small coil, which is extracted from the winder 4 by the take-out small coil processing device 18 as shown in FIGS. And held outside the winder 4. The small coil processing device 18 has the same structure as the small coil processing device 17 described above, and can swing and displace and open / close to grasp the small coil of the leader piece Y, and is perpendicular to the paper surface of the drawing. It is an apparatus which can extract a small coil from on the winder 4 by moving in any direction. By performing the reverse operation, the small coil can be held on the winder 4 again.
The output side winder 4 from which the small coil of the leader piece Y is extracted holds the output side end of the rolled material A as shown in FIG. . While applying tension to the rolled material A as well, rolling is performed until the joining point Xc between the entry side end and the leader piece X reaches the vicinity of the rolling mill 1 as shown in FIG.

When the joining point Xc reaches the separator 13 in the vicinity of the rolling mill 1, the leader piece X and the rolled material A are separated by the separator 13 as shown in FIG. 6D (for example, the leader in the vicinity of the joining point Xc). Cut piece X). After that, as shown in FIGS. 7E and 7F, the rolled material A is taken up as a coil CF1 by the delivery side winder 4, and is discharged as a product. In this case, the coil CF1 is hardly accompanied by the leader pieces XY.
In order to increase the operation efficiency, a new rolled material A is unwound from the unrolled hot coil CR2 newly prepared on the unwinder 2, and the rolling is started. Furthermore, before the new rolled material A is not wound on the delivery side winder 4, the leader piece X is wound by the small coil processing device 17 as shown in FIGS. 7 (f) and 7 (g). It is good to hold on 4.

  As described above, when the even-numbered pass is used as the final pass and the odd-numbered pass is used as the final pass, according to the illustrated method, almost no off-gauge portion is generated in the hot coil CR prepared as a raw material. . This is because, in the rolled material A, leader pieces X and Y are used in the vicinity of the end portions on the entry side and the exit side that cannot receive rolling by the rolling mill 1. Moreover, since the leader pieces X and Y are repeatedly used in the same rolling equipment, the cost does not increase due to the leader pieces X and Y.

In FIG. 1 to FIG. 7, a rolling facility and a rolling method in which a joining machine and a separating machine are arranged on both the entrance side and the exit side of the rolling mill 1, and any pass of the odd-numbered and even-numbered times is the final pass. Although shown, the invention is not limited to this. It is possible to reduce the loss of rolling material by reducing the off-gauge part even if the joining machine / separator is arranged only on one side of the inlet side and outlet side and the leader piece is joined only on one side of the rolled material. It is. Even if the off-gauge portion cannot be reduced on the side where the leader piece is not used, the off-gauge portion of the rolled material is surely reduced on the side where the leader piece is used.
In particular, when joining the leader piece to the exit end of the rolled material on the exit side and setting the even-numbered pass as the final pass, the off-gauge portion is reduced near the end on the one side (exit side). In addition, there is an advantage related to the ease of operation that the leader piece may be held on the take-up winder (there is no need to take out the leader piece from the winder by a small coil processing device or the like). The same merit is obtained when the leader piece is joined to the entrance end of the rolled material on the entry side and the odd-numbered pass is used as the final pass.

  Tables 1 and 2 show the results of trial calculation of merits by the rolling method using the leader piece as described above. Table 1 shows the case of 4-pass rolling (rolling with the fourth pass as the final pass), and Table 2 shows the 5-pass rolling (rolling with the fifth pass as the final pass). As shown in each table, assuming that the annual production is 250,000 tons, the average weight of the coil (rolled coil) is 18 tons, and the unit price of one hot coil (raw material coil) is 65,000 yen Yes. In the table, “Conventional” indicates the case of the conventional general rolling method shown in FIGS. 10 and 11 (the strip press 15 is not used). In the case of using the strip press 15 in the method of FIG. 11, the “P / R method” indicates the case of the method shown in FIG. “Exit L / S” is for joining the leader piece only on the exit side, “Ingress L / S” is for joining the leader piece only on the entry side, and “Both L / S” is The case where the leader piece is joined to both the entry side and the exit side is shown. When the leader piece is used only on the outgoing side, the even pass is the final pass, and when the leader piece is used only on the incoming side, the odd pass is the final pass. In "pass rolling", "entry side L / S" is not estimated, and in "Table 2" (during 5 pass rolling), "exiting L / S" is not estimated. In the table, “DTR” refers to the outlet winder and “ETR” refers to the inlet winder.

  As shown in each table, depending on the conventional rolling method, an off-gauge part that generates 350 kg or more per coil is about 120 kg (in the case of 4 passes / outgoing L / S) when a leader piece is used on one side or It is about 180kg (in the case of 5 passes / entry L / S) and decreases to the same level as the P / R method. When leader pieces are used on both sides, the weight is significantly reduced to about 50 kg, which is an improvement of about 150 million yen per year compared with the conventional rolling method.

Such comparison results are shown in FIG. 8 and FIG. FIG. 8 shows the case of 4-pass rolling, and FIG. 9 shows the case of 5-pass rolling. “One side L / S” indicates a case where the leader piece is joined only on one side, and “Both side L / S” indicates a case where the leader piece is used on both sides.
The off-gauge rate a (weight ratio of the off-gauge portion in the coil), which was about 2% depending on the conventional rolling method, is reduced to about half in “one side L / S” and further reduced in “both side L / S”. Moreover, it can be clearly seen from the figure that the annual improvement costs (vs. conventional method b and vs. S / P method c) due to them are also considerable.

Drawing 1 (a)-(d) is a key map showing a rolling method and rolling equipment as an embodiment about an embodiment of the invention. Drawing 2 (e)-(h) is a key map showing a rolling method and rolling equipment as an embodiment about an embodiment of the invention. Drawing 3 (i)-(k) is a key map showing a rolling method and rolling equipment as an embodiment about an embodiment of the invention. 4A to 4D are conceptual diagrams showing a rolling method and rolling equipment as embodiments relating to the invention. Drawing 5 (e)-(h) is a key map showing a rolling method and rolling equipment as an embodiment about an embodiment of the invention. 6A to 6D are conceptual diagrams showing a rolling method and rolling equipment as embodiments relating to the invention. Drawing 7 (e)-(g) is a key map showing a rolling method and rolling equipment as an embodiment about an embodiment of the invention. It is a diagram which shows a trial calculation result about the merit in the case of performing 4-pass rolling by the rolling method of invention. It is a diagram which shows a trial calculation result about the merit in the case of performing 5-pass rolling by the rolling method of invention. FIGS. 10A to 10D are conceptual diagrams showing conventional general lever rolling. FIG.11 (e)-(h) is a conceptual diagram shown about the conventional general lever rolling. It is a conceptual diagram which shows the conventional lever rolling by the pinch roll method. It is a conceptual diagram which shows the conventional lever rolling described in patent document 1. FIG. It is a conceptual diagram which shows the conventional lever rolling described in patent document 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling machine 2 Unwinding machine 3 Inlet side winder 4 Outlet side winder 11/12 Joining machine 13/14 Separator 17/18 Small coil processing apparatus A Rolled material X / Y Leader piece Xc / Yc Joining location

Claims (10)

A rolling method using a rolling mill and winders disposed on the entry side and the exit side of the rolling material to roll the rolling material with a rolling mill by causing a reciprocating pass,
Join the leader piece held by the winder to the end of the rolled material,
Rolling characterized in that the rolling material is rolled by the rolling mill without rolling the joining portion between the leader piece and the leader piece while applying tension from the winder through the leader piece even near the end portion. Method.   2. The rolling method according to claim 1, wherein the leader piece is separated from the rolled material before the start of the final pass and / or at the end of the final pass, and the leader piece is repeatedly used.   Join the leader piece to the exit end of the rolled material on the exit side of the rolling mill, and make the reciprocating pass and then the even-numbered pass to the entrance side winder as the final pass, at the end of the final pass, The rolling method according to claim 1 or 2, wherein the leader piece joined to the outlet end is separated.   Join the leader piece to the entrance end of the rolling material on the entry side of the rolling mill, and make the reciprocating pass and then the odd-numbered pass to the take-up winder as the final pass, at the end of the final pass, The rolling method according to claim 1, wherein the leader piece joined to the entry end is separated.   Join the leader piece to the exit end of the rolled material on the exit side of the rolling mill and join the leader piece to the entrance end of the rolled material on the entry side of the rolling mill to make a reciprocating pass, and then the final pass 3. The rolling method according to claim 1, wherein each of the leader pieces bonded to the outlet side end and the inlet side end is separated before and at the start.   The rolling method according to claim 1, wherein the leader piece and the rolled material are joined by spot welding. In rolling equipment equipped with a winder on the entry and exit sides of the rolling mill,
A joining machine capable of joining the rolled material and the leader piece and a separator for separating the leader piece from the rolled material are arranged between the winding machine and the rolling machine on the entry side or the exit side or on both sides. Features rolling equipment.   The rolling equipment according to claim 7, wherein a spot welder capable of simultaneously joining a plurality of locations in the plate width direction is disposed as the joining machine.   To the winding machine on the entry side or exit side of the rolling mill or on both sides, a processing device that can once remove the leader piece from the winding machine from the winding machine and hold it again on the winding machine The rolling equipment according to claim 7 or 8, characterized in that 9. The rolling machine according to claim 7, wherein a winding machine having a plurality of winding shafts that can be used by switching the position of the winding shaft is arranged as a winding machine on an entry side or an exit side or both sides of the rolling mill. The rolling equipment described.

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