JP2015085371A - Cold rolling method for steel plate coil and cold rolling facility therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold rolling method for a steel plate coil by which generation of a portion as an off-gage is suppressed and improvement of a yield can be achieved, and a cold rolling facility for the method.SOLUTION: In a cold rolling method by which steel plate coils fed by a pay-off reel 4 are wound around an outlet side tension reel 2 and an inlet side tension reel 3 respectively, and are repeatedly depressed by a rolling mill 1, after cold rolling, a residual wound steel plate coil which remains at the inlet side tension reel 3 is removed from the inlet side tension reel 3, a new steel plate coil is loaded onto the pay-off reel 4, then the residual wound steel plate coil and the new steel plate coil are joined with each other, the residual wound steel plate coil is taken up by the pay-off reel 4, further the new steel plate coil which is continuous to the taken-up residual wound steel plate coil positioned at the beginning is fed by the pay-off reel and is wound between the outlet side tension reel 2 and the inlet side tension reel 3, and a next cold rolling is started.

Description

  The present invention relates to a cold rolling method for a steel sheet coil suitable for cold rolling a steel sheet coil using a reversible rolling mill, and a cold rolling facility suitable for carrying out the method.

  The steel sheet coil sent out by the payoff reel is wound around the exit side tension reel and the entrance side tension reel, respectively, and the steel sheet coil is alternately repetitively moved in a reciprocating rolling mill disposed between them. In a cold rolling line that performs cold rolling by rolling, in the final rolling pass, the steel sheet coil is cut by a shear disposed on the exit side of the rolling mill before the tail end of the steel sheet coil comes off from the entry side tension reel. The steel sheet coil is completely wound up by the delivery-side tension reel and then paid out.

  By the way, in the cold rolling method, the remaining winding coil remaining on the entry-side tension reel is a part that becomes an off-gauge (unrolled part), and is usually carried out as scrap. This was a cause of a decrease in yield.

  As a prior art for reducing the generation of scrap that has been unavoidable in cold rolling using a reversible rolling mill, Patent Document 1 provides a thickness gauge and a speedometer on the entrance and exit sides of the rolling mill. When the speedometer on the delivery side of the rolling mill is reached, rolling is started by setting the roll gap of the rolling mill to a predetermined value, and the rolling is performed by winding the tip of the strip as it is on the take-up reel on the delivery side of the rolling mill. In addition, at the end of rolling, the rolling mill is pulled out while rolling the tail end of the strip, and based on the rolling method of winding around the take-up take-up reel, multiple passes of rolling are repeated by the same operation, and a predetermined plate is obtained. Methods have been proposed for producing thick strips.

Japanese Patent Laid-Open No. 10-263613

  However, in the rolling method disclosed in the above-mentioned prior art document 1, since the tail end is pulled out while rolling in a state where no tension is applied to the strip, the thickness variation is unavoidable, and the strip is not passed through. There is also a problem that the plate becomes unstable, and there is still room for improvement.

  An object of the present invention is to provide a cold rolling method of a steel sheet coil and its cold rolling equipment, which can suppress the occurrence of an off-gauge portion as much as possible and can improve the yield by increasing the length of a product portion. Proposed.

  In the present invention, steel sheet coils delivered by payoff reels are respectively wound around an output side tension reel and an input side tension reel, and the steel sheet coils are reciprocally moved by a rolling mill disposed between them, and alternately repeated. In the cold rolling method of the steel sheet that performs cold rolling by rolling, after the cold rolling is finished, the remaining wound steel sheet coil remaining on the entry side tension reel is removed from the entry side tension reel, and the payoff A new steel plate coil is loaded on a reel, and then the remaining steel plate coil and the new steel plate coil are connected to each other, and the remaining steel plate coil is wound on the payoff reel. The new steel sheet coil connected to this is sent from the payoff reel with the wound steel sheet coil at the head. It is both cold rolling method of steel plate coils, characterized in that wound around between each other of the outlet-side tension reel and the entering-side tension reel starts next cold rolling.

  In the cold rolling method of the steel sheet coil having the above-described configuration, the joining of the remaining steel sheet coil and the new steel sheet coil before the cold rolling is performed by cutting the end of each steel sheet coil with a shear. It is preferable as a specific means for solving the problem that the butt joining is performed by joining the cut end faces to each other.

  Further, the present invention has an exit side tension reel and an entrance side tension reel, and a rolling mill that performs cold rolling by alternately repetitively reducing the steel sheet coil wound between them while reciprocating, A payoff reel that is arranged adjacent to the entry side tension reel of the rolling mill, and that is loaded with a new steel plate coil before cold rolling and sends the new steel plate coil before cold rolling toward the exit side tension reel. A cold-rolling facility comprising: a remaining steel plate coil removed from the entry-side tension reel and a new steel plate coil before cold rolling loaded on the pay-off reel at an adjacent portion of the pay-off reel. Are joined to each other, and the joining device includes a cradle roll for rewinding the remaining coil and a clad An end of a remaining steel plate coil that is arranged between a roll and the payoff reel and is rewound by the cradle roll, and an end of a new steel plate coil before rolling that is rewound by the payoff reel are respectively cut. A steel sheet coil cold rolling facility comprising a shear and a welding machine that butt-joins the cut end faces of each steel sheet coil cut by the shear.

  In the above cold rolling equipment, the shear and the welding machine have both of them placed thereon, and have moving means capable of reciprocating between the cradle roll and the payoff reel. On the exit side and the entry side, the end vicinity region of the remaining wound steel sheet coil and the end region of the new steel sheet coil before rolling that has been rewound by the payoff reel are individually clamped in the upper and lower sides, respectively, The clamp has a clamp that abuts the cut end faces with each other by moving the remaining coil and the new coil before rolling rolled back by the payoff reel along the longitudinal direction while maintaining the holding posture. It is preferable as a specific means for solving the problem.

  According to the cold rolling method of the steel sheet coil of the present invention, after the cold rolling is finished, the remaining coil steel coil remaining on the entry side tension reel is temporarily removed from the entry side tension reel, and a new steel sheet is added to the payoff reel. The coil is loaded, and then the remaining steel sheet coil and a new steel sheet coil are connected to each other, and the remaining steel sheet coil is wound on the payoff reel. Since the new cold steel rolling is started by winding a new steel sheet coil that leads to this between the outgoing tension reel and the incoming tension reel, the portion that was off-gauge in the previous rolling was reused. As a result, the product portion of the steel sheet coil to be used for the next rolling is extended, and the yield can be improved.

  Further, according to the cold rolling method of the steel sheet coil of the present invention, the joining of the remaining rolled steel sheet coil and the new steel sheet coil before the cold rolling is performed by cutting the end of each steel sheet coil with a shear. Since the cut end faces are butt joined to join each other, the steel sheet coil can be smoothly fed and rolled.

  Further, according to the cold rolling facility of the present invention having the above-described configuration, the cold rolling facility has an output side tension reel and an input side tension reel, and reciprocates a steel sheet coil wound between them. A rolling mill that performs cold rolling by alternately and repeatedly rolling while moving, and an adjacent tension reel of the rolling mill, and a new steel plate coil before cold rolling is directed toward the outlet tension reel. A pay-off reel to be fed out, and a remaining steel plate coil removed from the entry-side tension reel and a new steel plate coil before cold rolling loaded in the pay-off reel at adjacent portions of the pay-off reel. There is provided a joining device for joining together, and the joining device is connected to a cradle roll for rewinding the remaining coil, and the cradle roll and the payoff roller. A shear that is disposed between the end of the remaining coil and the end of a new steel sheet coil before rolling that has been rewound by the payoff reel. Since it consists of the welding machine which mutually butt-joins the cut end surfaces of each steel plate coil cut | disconnected by the shear, efficient joining of steel plate coils and rapid rolling of the joined steel plate coil are attained.

  Further, according to the cold rolling equipment of the present invention, the shear and the welder are mounted together and have moving means capable of reciprocating between the cradle roll and the payoff reel. The end portion can be cut without moving the steel sheet coil itself, and accurate butt joining can be performed at the cut end face.

  Furthermore, according to the cold rolling equipment of the present invention, the end of the new steel sheet coil before rolling that has been rewound by the payoff reel and the area near the end of the remaining steel sheet coil on the outlet side and the inlet side of the welding machine. The upper and lower parts of the coil are individually clamped at the top and bottom, and the remaining coil and the new coil before rolling that has been rewound by the payoff reel are moved along the longitudinal direction while maintaining the clamping posture. Thus, since the clamps for abutting the cut end faces to each other are provided, the cut end faces can be abutted accurately when the steel sheet coils are joined to each other.

It is the figure which showed typically embodiment of the cold rolling equipment according to this invention. It is the figure which showed typically the principal part structure of the welding machine which comprises a joining apparatus. (A) (b) is the figure which showed the structural example of the joining position adjustment clamp installed in the welding machine, (a) is the figure shown by making the side into a cross section, (b) is the front FIG. (A)-(e) is the figure which showed the joining condition of a remaining volume steel plate coil and a new steel plate coil. It is the figure which compared and showed the case where it cold-rolled according to the conventional method, and the case where it cold-rolled according to this invention. (A) (b) is the figure which showed the structure of the side guide typically, (a) is a top view, (b) is a front view.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a diagram schematically showing a cold rolling facility suitable for use in carrying out the method according to the present invention.

  In the figure, reference numeral 1 denotes a reversible rolling mill (hereinafter simply referred to as a rolling mill), 2 denotes an exit side tension reel disposed on one side (dispensing side) of the rolling mill 1, and 3 denotes the other side of the rolling mill 1 (steel plate). The entry side tension reel 4 arranged on the coil supply side 4 is arranged in the immediate vicinity of the entry side tension reel 3 and is loaded with the steel plate coil C carried in from the pickling line or the like. This is a payoff reel for sending out toward the outgoing tension reel 2.

  The steel plate coil C delivered from the payoff reel 4 is wound around the entry tension reel 3 after its tail end is disengaged from the payoff reel 4, and the exit tension reel 2 and the entry tension reel The steel sheet coil C is rolled back to a predetermined thickness by repeatedly rolling down by the rolling mill 1 while reciprocating the steel sheet coil C between the three.

Reference numeral 5 denotes a shear which is provided in the immediate vicinity of the delivery side of the rolling mill 1 (the side where the delivery side tension reel 2 is installed) and cuts the steel sheet coil C after the end of cold rolling. The cutting of the steel plate coil C is performed before the tail end of the steel plate coil C is detached from the entry side tension reel 2, and the steel plate coil left on the entry side tension reel 2 by the cutting of the steel plate coil C remains. a wound steel plate coil _{C 1.}

Further, 6 is provided at an adjacent portion of the payoff reel 4, the tip of the remaining wound steel plate coil C ₁ removed from the entry side tension reel 2, and a new steel plate coil before cold rolling loaded on the payoff reel 4. This is a joining device that connects the tips of C to each other.

Joining device 6 is provided between the cradle rolls 6a rewind it with placing the remaining wound steel coil C _1, and the cradle rolls 6a and payoff reel 4, unwound by the cradle rolls 6a remaining and Shah 6b for cutting wound steel plate coil C ₁ tip and before rolling unwound by payoff reel 4 the tip of a new steel sheet coil C respectively, the cut end faces of the steel plate coil is cut by the shear 6b And a welding machine (a welding machine for performing TIG welding or the like is applied) 6c.

As shown in FIG. 2, the welding machine 6 c expands its main part, and the front end of the remaining steel plate coil C ₁ and the front end of the new steel plate C before rolling that has been rewound by the payoff reel 4 are pressing the backing metal 6c ₁ for receiving respectively at a lower surface, a torch 6c ₂ for TIG welding which performs position to welding the cut end faces of the steel plates _C 1, C directly on the backing metal 6c _1, each steel plate _C 1, C Then, a member provided with a pressing member 6c ₃ that stably holds the butted state of the cut end faces is applied.

As the pressing member 6c _3, for example, holds the main body _{6c 31} forming a main body of the pressing member 6c ₃ at such elastic members _{6c 32} of the leaf spring (the right of the center line in FIG. 2), the air gas such as inflating the tube _{6c 33} by filling presses the respective steel plates _C 1, C against the front end of the main body _{6c 31} to repulsive force of the elastic member _{6c 32} back metal 6c ₁ (left reference center line of FIG. 2 ) Can be used.

  Reference numeral 7 denotes a moving means for placing the shear 6b and the welding machine 6c and reciprocally moving between the cradle roll 6a and the payoff reel 4. As this moving means 7, for example, there is one comprising a base 7a having a rail installed toward the cradle roll 6a to the payoff reel 4 and a carriage 7b having wheels rolling along the rail of the base 7a. Applied. In addition, about the moving means 7, what is necessary is just to be able to move the shear 6b smoothly with the welding machine 6c, and it is not limited to what is comprised from the combination of the base 7a and the trolley | bogie 7b.

  Reference numeral 8 denotes a magnet type belt conveyor that is arranged between the payoff reel 4 and the joining device 6 and that allows the steel plate coil C to be conveyed while adsorbing the steel plate coil C on its surface. The belt conveyor 8 is supported by, for example, a hydraulic cylinder 8a, and the operation of the hydraulic cylinder 8a causes the end of the joining device 6 to be a fulcrum and the end of the payoff reel 4 to be close to or separated from the payoff reel 4. It can be tilted in the direction to be.

The belt conveyor 8 sends the steel sheet coil (C, C ₁ ) to the payoff reel when the tip of the steel sheet coil C loaded on the payoff reel 4 is sent out toward the shear 6b of the joining device 6 and after the joining is finished. 4 is disposed close to the payoff reel 4 when it is wound on the steel sheet 4, thereby enabling smooth induction of the steel plate coils (C, C ₁ ). The end of the belt conveyor 8 on the payoff reel 4 side can be provided with a non-driving roller that can roll in contact with the outer peripheral surface of the steel sheet coil C loaded on the payoff reel 4. The rollers can stabilize the tilting posture of the belt conveyor 8. The belt conveyor 8 has been described as adsorbing and conveying the steel plate coil C, but other means may be applied as long as the steel plate coil C can be conveyed simply and reliably to the shear 6b of the joining device 6. It is also possible, and it is not limited to a magnet type belt conveyor.

  Further, 9 is a plate alignment fine adjustment clamp (hereinafter referred to as an output side clamp 9) provided on the exit side of the welding machine 6c, and 10 is a plate alignment fine adjustment clamp (provided on the entry side of the welder 6c). Hereinafter, it is referred to as an entry side clamp 10). Here, the side on which the payoff reel 4 is arranged with respect to the welding machine 6c is defined as the exit side of the welding machine 6c, and the side on which the cradle roll 6a is disposed is defined as the entry side of the welding machine 6c.

  The exit-side clamp 9 sandwiches a region near the end of a new steel sheet coil C before rolling that has been rewound by the payoff reel 4 at the top and bottom thereof, and holds the steel sheet coil C in the longitudinal direction while maintaining the sandwiching posture. As shown schematically in FIG. 3, for example, the structure is shown in FIG. 3, for example, sandwiching plates 9a and 9b positioned on the upper and lower surfaces of the steel plate coil C, and the sandwiching plate 9a. The cylinders 9c and 9d that move the 9b and 9b toward and away from each other and the cylinders 9c and 9d are fixed, and can be moved back and forth (longitudinal direction of the steel plate coil C) along the guide g provided on the mount of the welding machine 6c It is composed of a simple gate-shaped frame 9e.

Also, the inlet side clamp 10, the end portion proximity of the unwound residual wound coil C ₁ by the cradle rolls 6a sandwiched at its top and bottom, and the The residue wound coils C ₁ while maintaining the holding orientation It can be moved along the longitudinal direction. Similarly to the above-mentioned exit side clamp 9, the entrance side clamp 10 also fixes a pair of sandwiching plates 10a and 10b, cylinders 10c and 10d that allow the sandwiching plates 10a and 10b to approach and separate from each other, and the cylinders 10c and 10d. The gate frame 10e is movable back and forth along a guide g provided on the frame of the welding machine 6c (see FIG. 3).

After the cutting by the shear 6b, the steel sheet coils C ₁ and C are sandwiched by the above-described output side clamp 9 and the input side clamp 10, and the output side clamp 9 and the input side clamp 10 are held in the longitudinal direction as they are. By appropriately moving them, it is possible to finely adjust the cut end faces accurately. The clamp moving mechanism is not limited to the illustrated one.

  A new steel sheet coil C before rolling, which is carried in from the pickling line and loaded on the payoff reel 4, is wound around the output side tension reel 2 by sending out by the payoff reel 4, and the steel plate coil is output by the output side tension reel 2. Rolling is performed by the rolling mill 1 while winding the coil.

  When the tail end of the steel sheet coil C is detached from the payoff reel 4 in the above rolling, the tail end is wound around the entry side tension reel 3 and is reversed by the rolling mill 1 while winding the steel sheet coil with the entry side tension reel 3. Re-rolling is performed.

  In the reverse re-rolling, rolling is temporarily stopped before the tail end of the steel sheet coil C is detached from the output side tension reel 2, and further, the rolling machine 1 performs normal rotation while winding the steel sheet coil C with the output side tension reel 2. Re-rolling is performed again, and the steel sheet coil C is finished to a predetermined thickness by repeating the above operation a plurality of times.

  After the cold rolling was finished, the steel plate coil C was cut by the shear 5 before the tail end of the steel plate coil C was detached from the entry side tension reel 3, and the winding of the steel plate coil C was finished by the exit side tension reel 2. It is paid out to the next process later.

The remaining coil steel coil C ₁ remaining on the entry side tension reel 3 is removed from the entry side tension reel 3 and conveyed to the cradle roll 6a of the joining device 6, while the payoff reel 4 includes A new steel plate coil C to be used for cold rolling is loaded.

The new steel coil C loaded in the pay-off reel 4 cold rolling when (next rolling) is, first, the remaining wound steel coil C _1, together with the rewound by the cradle rolls 6a, shown in FIG. 4 (a) Thus, the tip is cut over the entire width direction with a predetermined cutting margin by the shear 6b of the joining device 6.

Next, as shown in FIGS. 4B and 4C, the tip of a new steel sheet coil C loaded on the payoff reel 4 is sent to the shear 6b of the joining device 6 through the belt conveyor 8 and cut. the residue wound steel coil C ₁ which is temporarily lift the remaining wound steel coil using superposition and upper state (tiltable flapper table or the like, the leading end of a new steel sheet coil to the underside of the remaining wound steel coil The tip of a new steel plate coil C is cut.

Cutting the remaining wound steel coil C ₁ a new steel plate coil C by Shah 6b takes place at the same position, this cutting, drawing a remaining wound steel cut end surface of the coil C ₁ and the cut end face of the new steel coil C 4 ( As shown in d), the butt is maintained. Here, the cutting of the steel sheet coil according to Shah 6b has been described for the case of cutting the remaining wound steel coil C ₁ new steel coil C after cutting and after cutting the new steel coil C, the remaining wound steel may be cut coil residual wound steel coil C _1, performs this case, cleavage of the remaining wound steel coil C ₁ a new steel coil C after cutting in a state superimposed on the residual wound steel coil C ₁ .

After the steel plate coils C ₁ and C are cut by the shear 6b, as shown in FIG. 4 (e), the welding machine 6c is moved to the butt portion of the steel plate coil by the carriage 7a of the moving means 7, and the output side clamp 9 while sandwiching the new steel coil C by, with sandwiching the remaining winding coils C ₁ through inlet side crank 10, the steel plate coils to each other by the pressing member 6c ₃ against each steel coil back metal 6c ₁ by the welder 6c Are connected to each other. Thereafter, winding the remaining wound steel coil C ₁ with a new steel coil C by payoff reels 4, further wound residual wound steel coil C ₁ a top to the procedure similar to the described above a new steel plate coil C Roll according to the procedure. In addition, when a gap is formed between the steel sheet coils C ₁ and C when the steel sheet coils C ₁ and C are joined, the steel sheet coils C ₁ and C are sandwiched between the output side clamp 9 and the input side clamp 10, and the output side is held. The clamp 9 and the entry-side clamp 10 are appropriately moved along the longitudinal direction thereof, and fine adjustment for plate alignment is performed so that the cut end faces come into contact with each other.

In the cold rolling method according to the present invention, conventionally, the remaining wound steel coil C _1, which has been a scrap, next time reuse to the rolling of a new steel sheet coil C to cold rolling (the winding of the exit side tension reel As a result, the steel sheet coil that is newly cold-rolled can be rolled from its tip, and off-gauge can be reduced.

FIG. 5 shows a case where a steel plate coil having a length required for winding on a reel of 15 m and a remaining winding portion (remaining steel plate coil) of 15 m is cold-rolled according to the conventional method and according to the method of the present invention. It is the figure shown by comparing with the case where it cold-rolls (conformity method). In the present invention, in the following cold rolling, it is possible to utilize the residual wound steel coil C ₁ as parts necessary for winding reels of a new steel sheet coil C, the product become portion is 15m extended.

The welder 6c, but an end portion of a new steel sheet coil C remaining wound steel coil C ₁ has been described the case of providing a holding member 6c ₃ to stifle each at their ends, stable state abutting cut end faces Any other structure can be applied as long as it can be held and can secure a smoothly joined joint, and is not limited to the illustrated one.

Also, when bonding the new steel coil C and the residual wound steel coil C _1, the deviation between the width direction and the center of the width direction of the center of the remaining wound steel coil C ₁ of a new steel sheet coil C is generated If it is, it is also feared that the meandering occurs during the time or cold rolling to a winding of the remaining wound steel coil C _1. For this reason, it is good to provide suitably the side guide which is located in the edge part of the width direction of a steel plate coil, and guide | induces this steel plate coil along the longitudinal direction in the exit side and entrance side of the joining apparatus 6. FIG.

  6A and 6B are diagrams schematically showing the side guide. The side guide includes a contact plate member 11 that can abut against the width end of each steel plate coil, a slider 12 that holds the contact plate member 11, and the slider 12 together with the contact plate member 11 moves forward and backward in the width direction of the steel plate coil. A guide rod 13 that is configured and a base member 14 that fixes the guide rod 13 can be used. The movement of the contact plate 11 can be manually performed, but may be automatically controlled using a drive source.

Further, when the welding machine 6c and the shear 6b are moved on the base 7a by the carriage 7b of the moving means 7, a gap is formed by the amount of movement of the welding machine 6c and the shear 6b, so that a new steel plate coil C, since also envisaged that it can not to support the remaining winding coils C ₁ stably at the site may be preferably provided with extendable folding type table in accordance with the movement of the carriage 7b.

  According to the present invention, since the off-gauge portion generated in the cold rolling of the steel sheet coil is reused in the next cold rolling, the product portion can be extended and the yield can be improved.

1 Rolling mill (reversible rolling mill)
2 Outgoing tension reel 3 Incoming tension reel 4 Payoff reel 5 Shear 6 Joining device 6a Cradle roll 6b Shear 6c Welding machine 7 Moving means 7a Base 7b Carriage 8 Belt conveyor 9 Outlet clamp 9a Nipping plate 9b Clamping plate 9c Cylinder 9d Cylinder 9e Portal frame 10 Entry side clamp 10a Clamping plate 10b Clamping plate 10c Cylinder 10d Cylinder 10e Portal frame 11 Baffle plate member 12 Slider 13 Guide rod 14 Base member g Guide

Claims (5)

The steel sheet coil delivered by the payoff reel is wound around the output side tension reel and the input side tension reel, respectively, and the steel sheet coil is repetitively moved down and down repeatedly by a rolling mill disposed between them. In the cold rolling method of the steel sheet coil that performs cold rolling by:
After finishing the cold rolling, the remaining wound steel sheet coil remaining on the entry side tension reel is removed from the entry side tension reel, and a new steel sheet coil is loaded on the payoff reel. And the new steel sheet coil are connected to each other, the remaining steel sheet coil is wound up by the payoff reel, and the remaining steel sheet coil wound up is connected to the head of the new wound steel sheet coil. Is fed from the payoff reel and wound between the exit side tension reel and the entry side tension reel to start the next cold rolling.   The joining of the remaining steel sheet coil and the new steel sheet coil is by butt joining in which the ends of each steel sheet coil are cut by a shear and the cut end faces are butted together and joined. A method for cold rolling a steel sheet coil according to claim 1. A rolling mill having an output side tension reel and an input side tension reel, reciprocally moving the steel sheet coil wound between them, and cold rolling the steel sheet coil, and an input side tension reel of the rolling mill A pay-off reel that is arranged adjacently and is loaded with a new steel plate coil before cold rolling and sends the new steel plate coil before cold rolling to wind the steel plate coil around the exit side tension reel and the entrance side tension reel A cold rolling facility equipped with
In the adjacent part of the pay-off reel, a joining device is provided for connecting the remaining wound steel sheet coil removed from the entry-side tension reel and the new steel sheet coil before cold rolling loaded in the pay-off reel to each other,
The joining device includes a cradle roll for rewinding the remaining steel sheet coil, an end of the remaining steel sheet coil and the payoff reel disposed between the cradle roll and the payoff reel, Characterized by comprising a shear that cuts each end of a new steel sheet coil that has been unwound by rewinding, and a welding machine that butt-joins the cut end faces of each steel sheet coil cut by this shear. Cold rolling equipment for steel sheet coils.   The cold shear of the steel sheet coil according to claim 3, wherein the shear and the welder have a moving means for placing both of them together and reciprocally movable between the cradle roll and the payoff reel. Rolling equipment.   The welding machine individually has a region in the vicinity of the end of the remaining wound steel sheet coil and a region in the vicinity of the end of the new steel sheet coil before rolling that has been rewound by the payoff reel. While holding and holding the holding posture, the remaining rolled steel sheet coil and the new rolled steel sheet coil unrolled by the payoff reel are moved forward and backward along the longitudinal direction so that the cut end faces are brought into contact with each other. The cold rolling equipment for steel sheet coils according to claim 3 or 4, characterized by comprising a clamp.

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