JP4615261B2 - Butt joining device for strip metal sheet - Google Patents

Description

  The present invention is installed in a processing line that continuously performs rolling, heat treatment, and surface treatment of a strip metal sheet, or a press line that continuously produces various products such as lead frames and chassis from the strip metal sheet. The present invention relates to the improvement of a butt-joining device for a strip-shaped metal thin plate that joins the leading end of a trailing strip-shaped metal thin plate to the rear end of a preceding strip-shaped thin metal plate flowing over by butt welding. The present invention relates to a butt-joining apparatus for a strip-shaped metal thin plate in which the rear end of the strip-shaped metal thin plate and the leading end of the trailing strip-shaped metal thin plate are joined by butt welding.

In general, in a processing line that continuously performs rolling or heat treatment of a strip metal sheet, the rear end of the preceding strip metal sheet that is passed on the line in order to improve productivity, stabilize quality, etc. In addition, the tip of the trailing strip metal sheet is joined by butt welding, and the strip metal sheet is continuously processed.
In addition, when supplying processed strip-shaped metal sheets to customers as products, the strip-shaped metal sheets are joined together by butt welding so that the strip-shaped metal sheets have a predetermined length, and wound into a coil shape. Has been done.

  Conventionally, laser welding using a heat source with high energy density has been used for butt welding of strip metal sheets. In this laser welding, the amount of heat input is small, the penetration depth per unit heat input is large, the welded part is not deformed by thermal stress, and the coarsening of crystal grains in the heat affected zone is also reduced. There is an advantage that a high-quality weld can be obtained. Therefore, a laser welding apparatus is widely used for butt welding of an electromagnetic steel sheet having a very thin plate thickness.

However, the laser welding apparatus is extremely expensive and the apparatus itself becomes large, and has many problems in terms of maintenance and safety.
Also, during butt welding of a strip metal sheet using a laser welding device, the operator manually performs a butt contact between the trailing end of the preceding strip metal sheet and the leading end of the trailing strip metal sheet. There is a problem that the butt force of the strip-shaped metal thin plates is not always constant, or a partial gap is formed between the two strip-shaped metal thin plates, so that the butt of the two strip-shaped metal thin plates cannot be reliably and accurately performed. In such a state, if butt welding of the preceding strip metal sheet and the trailing strip metal sheet is performed by laser welding, a partial penetration failure may occur in the welded portion, the thickness unevenness of the welded portion, perforation, or bending of the welded portion. And so on.
In particular, the work of accurately butting a wide and thin strip-shaped metal thin plate is an extremely difficult work and requires considerable experience and skill, so that the above problem appears more remarkably.

  On the other hand, the present inventors use TIG welding instead of laser welding, so that even a very thin strip metal plate can be butt welded with high quality and beautifully. Butt joining devices have been developed and disclosed as Japanese Patent Laid-Open Nos. 11-347792 and 2001-47281. Since this butt-joining apparatus uses TIG welding, it is low in price and superior in operability, workability, handling, and the like as compared with a laser welding apparatus.

By the way, the butt-joining device is adapted to butt the end faces of the band-shaped metal plates using the bending and elastic force of the band-shaped metal thin plates. The end surfaces of the strip metal sheet can be easily and accurately abutted using the elastic force or the like of the strip metal sheet.
However, when a wide band-shaped metal thin plate is butted or when a band-shaped metal thin plate with a small elastic force is butted, the rear end of the preceding band-shaped metal thin plate and the front end of the subsequent band-shaped metal thin plate are not completely butted, There arises a problem that a partial gap is generated at the abutting portion of the belt-shaped metal plate, or the abutting force between the preceding belt-shaped metal thin plate and the trailing belt-shaped metal thin plate is not always constant. As a result, when the strip-shaped metal thin plates are butt welded, a partial penetration failure occurs in the welded portion, thickness unevenness of the welded portion, perforation, bending of the welded portion, or the like occurs.
Japanese Patent Laid-Open No. 11-347792 JP 2001-47281 A

  The present invention has been made in view of such problems, and its purpose is to provide a rear end of the preceding strip-shaped metal sheet and a leading end of the trailing strip-shaped sheet metal regardless of the width and thickness of the strip-shaped sheet metal. It is an object of the present invention to provide a belt-shaped metal sheet butt-joining apparatus capable of reliably and accurately performing butt-contacting.

In order to achieve the above object, the invention of claim 1 of the present invention is a belt-like metal sheet in which the rear end of the preceding strip-shaped metal sheet (W1) and the tip of the trailing strip-shaped metal sheet (W2) are joined by butt welding. A butt-joining device, the butt-joining device comprising a cabinet body (1) arranged in a posture orthogonal to the traveling direction of the preceding strip-shaped metal thin plate (W1) flowing on the line, and a cabinet body (1 ) And a preceding work table (3) for supporting and placing the rear end portion of the preceding strip-shaped metal thin plate (W1), and traveling of both strip-shaped metal thin plates (W1) and (W2) on the cabinet body (1). Is arranged so as to be movable in the direction and the width direction, and supports and places the leading end of the trailing strip metal sheet (W2), and the leading end of the trailing strip metal sheet (W2) is behind the leading strip metal sheet (W1). Subsequent work table (4 When both strip sheet metal (W1), cantilevered over the mounting plate (23) to the upper jig for clamping the abutting portion near the vertical (W2) (5 ') and the leading side working table (3) Clamp mechanism (5) composed of an attached lower jig (5 "), and a preceding band-shaped metal disposed in a slit-like gap formed at the center of the lower jig (5") so as to be movable up and down. TIG welding that butt welds the center plate (6) for positioning the rear end of the thin plate (W1) and the front end of the trailing strip metal thin plate (W2) and the butt portion of both strip metal thin plates (W1) and (W2). And a rear end portion of the preceding strip-shaped metal thin plate (W1) supported and mounted on the upper surfaces of the preceding work table (3) and the succeeding work table (4), and a device (7). Each work by the magnetic force at the tip of the trailing strip metal sheet (W2) Tables (3) and (4) Electromagnets (2) attracted and held on the upper surface are arranged in two rows along the width direction of both strip metal thin plates (W1) and (W2). The feature is that the tip of the welding electrode rod (27) of (7) is formed in a sharp conical shape, and the arc length during butt welding is set to a length that does not cause magnetic blowing.

In the invention of claim 2 of the present invention, the upper jig of the clamp mechanism is disposed in an opposing manner in a posture along the width direction of the two strip-shaped metal thin plates, and abuts on the upper surface in the vicinity of the butt portion of the two strip-shaped metal thin plates. It consists of left and right upper clamps made of copper and made of copper material that can swing in the vertical direction , and the left and right upper clamps are divided into a plurality of block bodies in the width direction of both strip-shaped metal thin plates. It is characterized in that the tip is elastically brought into contact with the upper surface in the vicinity of the abutting portion of both belt-like metal thin plates by an elastic body.

The butt-joining apparatus according to claim 1 of the present invention includes a rear end portion of a preceding strip-shaped metal thin plate and a front end portion of a trailing strip-shaped metal thin plate supported and mounted on the upper surfaces of the preceding-side work table and the succeeding- side work table. Are arranged in two rows along the width direction of the two strip metal plates, so that they are supported and mounted on the preceding work table and the succeeding work table. It is possible to securely and firmly hold the rear end of the preceding strip-shaped metal thin plate and the tip of the trailing strip-shaped metal thin plate placed on the upper surface of each work table. As a result, the butt-joining device of the present invention reliably prevents the two strip-shaped metal thin plates from shifting or floating when the rear end of the preceding strip-shaped metal thin plate and the tip of the trailing strip-shaped metal thin plate are brought into contact with each other. Even a wide strip metal sheet can be reliably and accurately matched.
Further, the butt welding apparatus of the present invention is configured so that the trailing work table can be moved and adjusted in the running direction and the width direction of the strip metal sheet, so that the rear end of the preceding strip metal sheet and the trailing strip metal sheet can be adjusted. By adjusting the movement of the trailing work table in the running direction and the width direction of the strip metal sheet when abutting with the tip, both strip metal sheets can be butted more reliably and accurately, and the leading strip metal sheet The rear end and the front end of the trailing metal strip can always be brought into contact with each other with a constant pressing force.
Furthermore, in the butt welding apparatus of the present invention, the tip of the tungsten electrode rod is formed in a sharp conical shape to concentrate the arc, and the arc length during butt welding is set to a length that does not cause magnetic blowing. Therefore, the arc is not affected by the magnetic field, and magnetic blowing during welding can be prevented. In other words, the butt-joining device of the present invention is capable of TIG welding even if an electromagnet is used to hold the leading strip metal sheet and the trailing strip metal sheet on the upper surface of the leading work table and the trailing work table. By using this method, butt welding of both strip metal sheets can be performed reliably and satisfactorily.

The butt-joining device according to claim 2 of the present invention can further exhibit the following effects in addition to the above effects.
That is, the butt-joining apparatus according to claim 2 of the present invention divides the left and right upper clamps that hold the vicinity of the butt portion of the two strip metal sheets into a plurality of block bodies in the width direction of the two strip metal sheets, and Is elastically brought into contact with the upper surface in the vicinity of the abutting portion of both strip metal sheets by the elastic force of the elastic body. The upper surface of the tool can be uniformly pressed, and the two metal strips can be butt-matched with high accuracy.

  1 to 3 show a strip metal thin plate butt joining apparatus according to an embodiment of the present invention. The butt joint apparatus performs rolling, heat treatment, and surface treatment of a wide strip metal thin plate such as a magnetic steel sheet. It is installed in a continuous processing line or a press line that continuously produces various products such as lead frames and chassis from a strip-shaped metal sheet, and a wide preceding strip-shaped sheet metal W1 flowing on the line. Similarly, the leading end of the wide strip-like thin metal plate W2 is joined to the rear end by butt welding so that the trailing strip-like thin metal plate W2 can be supplied onto the line following the preceding strip-like thin metal plate W1.

  That is, the butt-joining device is provided in the cabinet body 1 having a long and narrow box shape arranged in a posture orthogonal to the traveling direction of the preceding strip-shaped metal thin plate W1 flowing on the line, The leading work table 3 provided with the electromagnet 2 on which the rear end portion of the belt-like metal thin plate W1 is supported and placed, and the cabinet body 1 are arranged so that the movement of both the belt-like metal thin plates W1, W2 can be adjusted in the traveling direction and the width direction. The trailing work table 4 provided with the electromagnet 2 on which the leading end of the trailing strip metal thin plate W2 is supported and placed, and the vicinity of the abutting portions of the leading strip metal thin plate W1 and the trailing strip metal thin plate W2 are viewed from above and below. A clamping mechanism 5 composed of an upper jig 5 'and a lower jig 5 "to be held, and a rear band-like metal thin plate and a trailing belt-like metal thin plate W1 disposed at the center of the lower jig 5" so as to be movable up and down. Beyond W2 Is composed of a center plate 6 that performs positioning, a TIG welding device 7 that butt welds the butted portions of both strip metal thin plates W1 and W2, an operation panel 8 with a monitor that sets welding conditions, electrode positions, and the like. Yes.

  Specifically, as shown in FIG. 2 and FIG. 3, the cabinet body 1 is a box-like shape disposed in a position perpendicular to the preceding strip-shaped metal thin plate W1 at a position below the preceding strip-shaped thin metal plate W1 flowing on the line. 1A, and a box-shaped rear cabinet portion 1B disposed at a rear position of the front cabinet portion 1A (right side position of the front cabinet portion 1A shown in FIGS. 2 and 3). A gas cylinder for welding, a power supply device for welding, and the like (both not shown) are stored.

As shown in FIGS. 1 and 2, the preceding work table 3 and the succeeding work table 4 are in a horizontal posture and opposed to a lifting platform 9 provided on the upper surface of the front cabinet portion 1A of the cabinet body 1 so as to be lifted and lowered. As the elevator 9 moves up and down, it moves up and down at lower positions than the pass lines of the preceding strip-shaped metal thin plate W1 and the trailing strip-shaped metal thin plate W2. The lifting platform 9 is supported on the upper surface of the front cabinet portion 1A through a plurality of vertical support shafts 10 so as to be movable up and down, and extends and contracts a plurality of fluid pressure cylinders 11 provided in the front cabinet portion 1A. Therefore, it moves up and down.
Further, on the upper surface of the preceding work table 3 and the succeeding work table 4, the rear end portion of the preceding belt-like metal thin plate W1 and the tip portion of the succeeding belt-like metal thin plate W2 supported and mounted thereon are magnetically operated. The electromagnets 2 that are attracted and held on the upper surfaces of the tables 3 and 4 are provided. As shown in FIGS. 1 and 6, the electromagnets 2 are arranged in two rows on the upper surfaces of the preceding work table 3 and the succeeding work table 4 along the width direction of the two strip metal thin plates W1 and W2, respectively. Has been.

Then, as shown in FIG. 4, the rear work table 4 is mounted on a movable table 13 supported on the upper surface of the lifting / lowering table 9 via a guide rail 12 so as to be reciprocally movable in the width direction of the strip metal thin plates W1 and W2. It is arranged, and is reciprocated in the width direction of the strip-shaped metal thin plates W1 and W2 by a driving device 14 provided between the lifting platform 9 and the movable platform 13. As shown in FIGS. 4 and 9, the driving device 14 is attached to the elevating table 9 on the lower surface side of the moving table 13 and the screw shaft 14 a that is rotatably supported in the posture along the width direction of the strip-shaped metal thin plates W <b> 1 and W <b> 2. And a block nut 14b into which the screw shaft 14a is screwed, a motor 14c that is attached to the lifting platform 9 and rotates the screw shaft 14a forward and reverse, and a transmission mechanism 14d that interlocks and connects the screw shaft 14a and the motor 14c. The screw shaft 14a is rotated forward / reversely by the motor 14c, and the block nut 14b and the movable table 13 are moved along the screw shaft 14a, whereby the trailing work table 4 is reciprocated in the width direction of the strip metal thin plates W1 and W2. It can be made to.
Further, as shown in FIGS. 4 and 6, the trailing work table 4 is supported on the upper surface of the movable table 13 through a guide rail 15 so as to be reciprocally movable in the traveling direction of the strip metal thin plates W1 and W2. By extending and contracting a plurality of fluid pressure cylinders 16 interposed between the moving table 13 and the following work table 4, the belt-like metal thin plates W1 and W2 are reciprocated in the traveling direction.

  As shown in FIG. 3, the clamp mechanism 5 is disposed in the upper position of the cabinet body 1 so as to be horizontally movable in the front-rear direction, and holds the upper surface in the vicinity of the abutting portion of the preceding strip-shaped metal thin plate W1 and the trailing strip-shaped metal thin plate W2. The upper jig 5 'is disposed between the preceding work table 3 and the succeeding work table 4, and is moved up and down synchronously with the two work tables 3 and 4 between the upper jig 5'. The lower jig 5 ″ that holds the vicinity of the abutting portions of the strip-shaped metal thin plates W1 and W2 is moved forward. After the upper jig 5 ′ is advanced and moved to a position above the lower jig 5 ″, the lower jig 5 ″ is moved. By raising the tool 5 ″, the vicinity of the butt portion of the two strip-shaped metal thin plates W1 and W2 can be tightly and firmly held and fixed between the upper jig 5 ′ and the lower jig 5 ″. Yes.

That is, as shown in FIGS. 3 and 4, the upper jig 5 ′ is slightly in a posture along the width direction of the two strip-like metal thin plates W <b> 1 and W <b> 2 on the lower surface of the support frame 17 provided on the upper surface of the rear cabinet portion 1 </ b> B. It consists of long upper and lower clamps 5a made of copper material, which are arranged oppositely with a small gap between them and can come into contact with the upper surface in the vicinity of the abutting portion of both strip-shaped metal thin plates W1 and W2. This is intended to concentrate the arc energy to the abutting portions of the two strip-shaped metal thin plates W1 and W2 while blocking the spread of.
The left and right upper clamps 5 a are divided into a plurality of block bodies 5 a ′ in the width direction of the strip-shaped metal thin plates W 1, W 2, and each block body 5 a ′ swings up and down via a shaft 18 on the lower surface of the support frame 17. It is supported freely.
Further, as shown in FIG. 4, the left and right upper clamps 5a are urged downward by an elastic body 19 (compression spring) interposed between the support frame 17 and each block body 5a '. A tip portion formed in a thin plate shape of 5a 'is configured to elastically abut on the upper surfaces of both strip-shaped metal thin plates W1 and W2.
Further, as shown in FIG. 4, the left and right upper clamps 5a are rocked downward by a stopper member 20 (comprising bolts and nuts) inserted and supported by a part of the support frame 17 and each block body 5a '. It is regulated.
The support frame 17 for supporting the upper jig 5 'is formed on the upper surface of the rear cabinet portion 1B via the guide rails 21 as shown in FIGS. It is arranged so as to be horizontally movable in the direction, and can be reciprocated in the width direction of both strip-shaped metal thin plates W1 and W2 by a driving device 22 comprising a rack 22a, a pinion 22b and a motor 22c. By reciprocating the support frame 17, the upper jig 5 ′ is placed on the clamp position (solid line position in FIG. 2) located above the lower jig 5 ″ to be described later and the stand-by located above the rear cabinet portion 1 </ b> B. The position (the one-dot chain line position in FIG. 2) can be taken.

On the other hand, the lower jig 5 ″ is disposed between the preceding work table 3 and the succeeding work table 4 as shown in FIGS. It consists of left and right lower clamps 5b made of copper material that can come into contact with the lower surface, and absorbs excess heat when butt-welding the belt-like metal thin plates W1, W2, so that the beads are melted or perforated. In addition to preventing thermal distortion and the like of the strip-shaped metal thin plates W1 and W2, a shield gas is allowed to flow behind the butted portions of the strip-shaped metal thin plates W1 and W2 to prevent oxidation of the welded portion.
The left and right lower clamps 5b are arranged between the preceding work table 3 and the succeeding work table 4 so that the upper surfaces thereof are flush with the upper surfaces of the preceding work table 3 and the succeeding work table 4. And is attached to the preceding work table 3 via a plurality of attachment plates 23.
In addition, a slit-like gap is formed between the left and right lower clamps 5b so that a center plate 6 (described later) is inserted in a loosely fitted state, and a slit-like gap is formed on the upper surface between the left and right lower clamps 5b. A shallow groove having a width of 1 mm is formed so as to flow through a shield gas such as argon gas.

  The center plate 6 is formed in a long plate shape by a thin steel plate having a thickness of 0.5 mm as shown in FIGS. 4, 7, and 8, and is formed in a slit shape formed between the left and right lower clamps 5b. It is arranged in the gap in a vertical posture and freely movable up and down. The center plate 6 is attached to the rods of a plurality of fluid pressure cylinders 24 attached to the lifting platform 9 via attachment fittings 25. When the fluid pressure cylinder 24 is shortened, a slit shape is formed between the left and right lower clamps 5b. When the fluid pressure cylinder 24 is extended, the tip of the fluid pressure cylinder 24 protrudes upward by about 5 mm from the upper surface of the left and right lower clamps 5b.

The TIG welding apparatus 7 is disposed on a support frame 17 provided in the cabinet body 1 and is drawn forward together with the support frame 17 when welding the butted portions of the strip-shaped metal thin plates W1 and W2, Is moved along the width direction of the strip-shaped metal thin plates W1, W2.
That is, as shown in FIG. 4, the TIG welding apparatus 7 includes a traveling table 26 that is disposed on the upper surface of the support frame 17 via a guide rail 31 so as to be reciprocally movable in the width direction of the strip metal thin plates W1 and W2. A torch comprising a welding torch 28 with a tungsten electrode rod 27 inserted and a servo motor for raising and lowering the welding torch 28 while being supported by the table 26 so as to be movable up and down, and flowing a shielding gas such as argon gas from the tip. A vertical motion drive device (not shown), a monitoring camera (not shown) for checking the welding situation (consumption of the tungsten electrode rod 27, arc condition, etc.) and the abutting situation of the strip metal thin plates W1, W2, and the carriage 26 A laser sensor 29 which is attached and automatically measures the width of the leading strip metal sheet W1 and the trailing strip metal sheet W2, the electrode and the strip metal sheets W1, W before the start of welding. The electrode contact detection device (not shown) that immediately detects a contact accident between the electrode and the strip-shaped metal thin plates W1, W2 during welding, and the width direction of the strip 26 in the width direction of the strip-shaped thin metal plates W1, W2 And the like, and is pulled out forward together with the support frame 17 when welding the abutting portions of the strip-shaped metal thin plates W1 and W2, and the tip of the welding torch 28 is automatically raised. The welding torch 28 is adjusted and linearly moves along the abutting portions of the strip-shaped metal thin plates W1 and W2 at a predetermined speed.
Further, as shown in FIG. 2, the drive device 30 is attached to a screw shaft 30 a that is rotatably supported on the upper surface of the support frame 17 in a posture along the width direction of the strip-shaped metal thin plates W <b> 1 and W <b> 2, and the traveling platform 26. A block nut 30b into which the screw shaft 30a is screwed, and a motor 30c attached to the support frame 17 and interlocked and connected to the screw shaft 30a to rotate the screw shaft 30a in the forward and reverse directions. By rotating and moving the block nut 30b and the traveling base 26 along the screw shaft 30a, the traveling base 26 and the welding torch 28 supported by the traveling base 26 are reciprocated in the width direction of the strip-shaped metal thin plates W1 and W2. Can be done.
In this TIG welding apparatus 7, the tip of the welding electrode rod 27 is formed in a sharp conical shape so that the arc is concentrated, and the arc length during butt welding is magnetic blown (the arc is affected by the magnetic field). The length is set so as not to cause a phenomenon of deflection upon receiving. In this embodiment, the distance between the tip of the tungsten electrode rod 27 and the butted portions of the two strip metal thin plates W1 and W2 at the time of butt welding is set to be 0.3 mm to 0.7 mm.

Next, a description will be given of a case where the wide preceding strip metal thin plate W1 and the wide trailing strip metal thin plate W2 are joined by butt welding using the butt joining apparatus for the strip metal thin plates W1 and W2.
The welding conditions such as welding current, arc length, supply amount of inert gas, traveling speed of the welding torch 28, tip shape of the tungsten electrode rod 27, etc. are the materials, plate thickness, width, etc. of the strip metal thin plates W1, W2. It is a matter of course that the optimum conditions are set according to the above.

  First, the rear end portion of the preceding strip-shaped metal thin plate W1 and the front end portion of the trailing strip-shaped metal thin plate W2 are cut in a straight line in the width direction by a cutting device (not shown), and then the center plate 6 is moved by the fluid pressure cylinder 24. The tip of the center plate 6 is raised to project upward from the upper surfaces of the left and right lower clamps 5b.

Next, the rear end portion of the preceding strip-shaped metal thin plate W1 is placed on the upper surface of the preceding work table 3, and the rear end of the preceding strip-shaped metal thin plate W1 is manually abutted against one side surface of the center plate 6, and in this state The electromagnet 2 provided on the preceding work table 3 is turned on, and the rear end of the preceding strip-shaped metal thin plate W1 is attracted and held on the upper surface of the preceding work table 3 by magnetic force (see FIG. 10A). . At this time, a part of the rear end (welding start end) of the preceding strip-shaped metal thin plate W1 is displayed on the monitor of the operation panel 8 by the monitoring camera.
Subsequently, the leading end of the trailing strip metal sheet W2 is placed on the upper surface of the trailing work table 4, and the leading end of the trailing strip metal sheet W2 is manually abutted against the other side surface of the center plate 6, and in this state. The electromagnet 2 provided on the trailing work table 4 is turned on, and the leading end of the trailing belt-like metal thin plate W2 is held and fixed to the upper surface of the trailing work table 4 by a magnetic force (see FIG. 10A). Also at this time, a part of the rear end (welding start end) of the preceding strip-shaped metal thin plate W1 is displayed on the monitor of the operation panel 8 by the monitoring camera.

  Thereafter, the center plate 6 is lowered by the fluid pressure cylinder 24 and stored between the left and right lower clamps 5b, and the trailing work table 4 is advanced by the fluid pressure cylinder 16 so that the leading end of the trailing belt-like thin metal plate W2 is moved to the leading metal. It abuts on the rear end of the thin plate (see FIG. 10B). In this state, the trailing work table 4 is moved and adjusted by the drive device 14 in the width direction of the strip-shaped metal thin plates W1, W2, and the deviation in the width direction of the preceding strip-shaped metal thin plate W1 and the trailing strip-shaped metal thin plate W2 is corrected. The widthwise ends of the strip-shaped metal thin plates W1, W2 are matched. At this time, since the belt-like metal thin plates W1 and W2 are securely and firmly attracted and held by the electromagnet 2 on the work tables 3 and 4, the belt-like metal thin plates W1 and W2 are displaced at the time of abutting the belt-like metal thin plates W1 and W2. The wide band-shaped metal thin plates W1 and W2 can be reliably and accurately matched with high accuracy. Further, since the trailing work table 4 is advanced by the fluid pressure cylinder 16 so that the leading end of the trailing strip metal sheet W2 is abutted against the trailing end of the preceding strip metal sheet W1, both strip metal sheets W1, W2 are used. The end surfaces of the sheet metal are always brought into contact with each other in a pressurized state and are in close contact with each other, and the rear end of the preceding strip-shaped metal thin plate W1 and the front end of the trailing strip-shaped metal thin plate W2 can always be butted together with a constant pressing force. .

  When the rear end of the preceding strip metal thin plate W1 and the leading end of the trailing strip metal thin plate W2 are abutted, the support frame 17 moves forward so that the left and right upper clamps 5a are positioned above the butting portions of the strip metal thin plates W1 and W2 ( To the clamp position) (see FIG. 11A). In this state, the lifting platform 9 is raised by the fluid pressure cylinder 11, and the work tables 3, 4 and the lower clamp 5b are raised so that their upper surfaces are substantially at the same height as the lower surface of the tip of the upper clamp 5a ( (See FIG. 11B). Thereby, both strip | belt-shaped metal thin plates W1 and W2 are tightly and firmly clamped and fixed between the upper clamp 5a and the lower clamp 5b in a state where the end faces are completely butted. At this time, the left and right upper clamps 5 a are divided into a plurality of block bodies 5 a ′ in the width direction of both strip metal thin plates W 1, W 2, and the end of each block body 5 a ′ is formed by the elastic force of the elastic body 19. , W2 is elastically brought into contact with the upper surface in the vicinity of the abutting portion, so that even in the case of the wide belt-like metal thin plates W1, W2, the entire end portion extends to the upper surface of the left and right lower clamps 5b across the width direction. It is possible to press evenly, and it is possible to butt both the strip-shaped metal thin plates W1 and W2 with high accuracy.

When the butted portions of the two belt-like metal thin plates W1 and W2 are clamped and fixed by the clamp mechanism 5, the traveling platform 26 on the support frame 17 is advanced by the driving device 30, and the laser sensor 29 provided on the traveling platform 26 is moved to the belt-shaped metallic thin plate W1. , W2 are automatically measured, and the butt portions of both strip metal thin plates W1, W2 are butt welded by the TIG welding device 7 according to a predetermined program.
That is, the electromagnets 2 provided on the preceding work table 3 and the succeeding work table 4 are turned off, and the welding torch 28 is lowered so that the tips of the tungsten electrode rods 27 are connected to the strip metal thin plates W1 and W2. An arc is generated between the tip of the tungsten electrode rod 27 and the strip metal thin plates W1 and W2 at the end of the butt portion. Thereafter, the traveling table 26 is moved backward by the driving device 30 to cause the welding torch 28 to travel along the abutting portions of the strip-shaped metal thin plates W1 and W2 to butt weld the abutting portions. At this time, the tip of the tungsten electrode rod 27 is formed in a sharp conical shape to concentrate the arc, and the arc length at the time of butt welding is set to a length that does not cause magnetic blowing. As shown in FIG. 5, the butt-welding can be satisfactorily and surely performed even with the strip-shaped metal thin plates W1 and W2 having the insulating film formed on the surface, and the influence of the residual magnetism generated on the electromagnet 2 and the strip-shaped metal thin plates W1 and W2 The magnetic blow during welding can be prevented without receiving. That is, even if the electromagnet 2 is used to hold the leading strip metal thin plate W1 and the trailing strip metal thin plate W2 on the upper surfaces of the leading work table 3 and the trailing work table 4, both of them are formed using the TIG welding method. Butt welding of the strip metal thin plates W1 and W2 can be performed reliably and satisfactorily.

  Note that when the end portions of the preceding strip-shaped metal thin plate W1 and the trailing strip-shaped metal thin plate W2 were cut by the cutting device, the ends were not cut at right angles to the longitudinal direction, but the strip-shaped metal thin plates W1, W2 were butted together. Even when only the welding start end is sometimes abutted, due to shrinkage deformation that occurs as the welding progresses, the welding end sides of both belt-like metal thin plates W1 and W2 are sequentially abutted, so that butt welding is ensured and It can be done well.

  Then, when the butt welding of the two strip metal thin plates W1 and W2 is completed, the electromagnet 2 is turned on to hold the two strip metal thin plates W1 and W2 on the upper surfaces of the work tables 3 and 4, and in this state. After both the work tables 3 and 4 and the lower clamp 5b are lowered and the support frame 17 and the upper clamp 5a are subsequently retracted, the electromagnet 2 is turned off to open the two strip-shaped metal thin plates W1 and W2. Thus, the trailing strip metal sheet W2 joined to the rear end of the leading strip metal sheet W1 is supplied onto the line following the preceding strip metal sheet W1.

It is a partial notch front view of the butt joining apparatus of the strip | belt-shaped metal thin plate which concerns on embodiment of this invention. It is a partially cutaway side view of a butt joining apparatus. It is a top view of a butt-joining apparatus. It is a longitudinal cross-sectional view of the principal part of a butt-joining apparatus. It is a longitudinal cross-sectional view of the drive device which reciprocates a support frame and a support frame. It is a top view of a preceding work table and a succeeding work table. It is a top view of a center plate and an elevator stand part. It is a longitudinal cross-sectional view of a state in which the support frame, the upper clamp, and the like are moved to the upper positions of the preceding work table and the succeeding work table. It is a longitudinal cross-sectional view of an elevator stand and a moving stand. The operating state of the butt-joining device is shown. (A) positions the preceding strip-shaped metal sheet and the trailing strip-shaped metal sheet by the center plate, and holds both strip-shaped metal sheets on the leading-side work table and the succeeding-side work table by the electromagnet. (B) is a longitudinal cross-sectional view of a state in which the trailing end work table is moved and adjusted so that the rear end of the preceding strip-shaped metal thin plate and the leading end of the trailing strip-shaped metal thin plate are brought into contact with each other. The operating state of the butt-joining device is shown, (A) is a longitudinal sectional view of the state where the upper jig etc. are moved to the upper position of both strip-shaped metal thin plates, (B) is the both work table, lower jig, etc. It is a longitudinal cross-sectional view of a state in which the vicinity of the butted portion of both belt-like metal thin plates is clamped and fixed by the upper jig and the lower jig.

Explanation of symbols

  2 is an electromagnet, 3 is a leading work table, 4 is a trailing work table, 5 is a clamp mechanism, 5 'is an upper jig, 5 "is a lower jig, 5a is a left and right upper clamp, and 5a' is a block body. , 6 is a center plate, 7 is a TIG welding apparatus, 19 is an elastic body, W1 is a preceding strip-shaped metal thin plate, and W2 is a trailing strip-shaped metal thin plate.

Claims (2)

A belt-shaped metal sheet butt joining device for joining the rear end of the preceding belt-shaped metal sheet (W1) and the tip of the trailing band-shaped metal sheet (W2) by butt welding,
The butt joining device includes a cabinet body (1) arranged in a posture orthogonal to the traveling direction of the preceding strip-shaped metal thin plate (W1) flowing on the line,
A preceding work table (3) disposed on the cabinet body (1) for supporting and placing the rear end portion of the preceding strip-shaped metal thin plate (W1);
The cabinet body (1) is disposed so as to be movable and adjustable in the running direction and width direction of the two strip metal thin plates (W1) and (W2), and supports and mounts the leading end of the trailing strip metal thin plate (W2). A trailing work table (4) for abutting the leading end of the strip-like thin metal plate (W2) with the rear end of the leading strip-like thin metal plate (W1);
It is attached to the upper jig (5 ') and the preceding work table (3) for holding the vicinity of the abutting portion of both strip-shaped metal thin plates (W1) and (W2) in a cantilever manner via a mounting plate (23). A clamping mechanism (5) comprising a lower jig (5 ″);
Positioning of the rear end of the preceding strip-shaped metal thin plate (W1) and the leading end of the trailing strip-shaped metal thin plate (W2) is disposed in a slit-like gap formed at the center of the lower jig (5 ″). A center plate (6) for performing
And a TIG welding device (7) for butt welding the butt portions of both strip metal thin plates (W1) and (W2),
On the upper surfaces of the preceding work table (3) and the succeeding work table (4), the rear end portion of the preceding belt-like metal thin plate (W1) and the tip of the succeeding belt-like metal thin plate (W2) supported and mounted thereon. The electromagnets (2) for attracting and holding the work parts (3) and (4) on the upper surface of each work table by magnetic force are arranged in two rows along the width direction of both strip metal thin plates (W1) and (W2), respectively. ,
Furthermore, the tip of the welding electrode rod (27) of the TIG welding apparatus (7) is formed in a sharp conical shape, and the arc length during butt welding is set to a length that does not cause magnetic blowing. Butt joining device for strip metal sheet. The upper jig (5 ') of the clamp mechanism (5) is disposed in a posture along the width direction of both strip metal thin plates (W1), (W2) and in an opposing manner, so that both strip metal thin plates (W1), ( W2) The upper and lower upper clamps (5a) are made of a copper plate and are made of a long plate that can swing in the vertical direction and can be brought into contact with the upper surface in the vicinity of the butting portion. The thin plates (W1) and (W2) are divided into a plurality of block bodies (5a ′) in the width direction, and the ends of the respective block bodies (5a ′) are formed by the elastic bodies (19) to form both strip metal thin plates (W1) and (W2). The apparatus for butt-joining strip metal sheets according to claim 1, wherein the butt-joining apparatus is elastically brought into contact with the upper surface in the vicinity of the butting portion.

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