JP6303800B2 - Steel plate welding apparatus, steel plate cutting method and steel plate welding method - Google Patents

Description

  The present invention relates to a steel plate welding apparatus that welds the tail end of a preceding steel plate and the tip of a subsequent steel plate.

  Some steel plate production lines are equipped with a steel plate welding apparatus for welding a preceding steel plate and a succeeding steel plate in order to realize continuous sheet passing. Among steel plate welding apparatuses, laser welding apparatuses used for supplying to pickling processes, cold rolling processes, and the like are known. The laser welding apparatus cuts the preceding steel plate and the succeeding steel plate, abuts the tail end of the cut preceding steel plate and the tip of the succeeding steel plate, and irradiates the abutted portion with a laser so that the tail end of the preceding steel plate The tip of the subsequent steel plate is welded.

  Patent Document 1 discloses a metal plate butt welding apparatus including an output side clamp, an input side clamp, a lower shear, an upper shear, a welding apparatus for laser welding, and the like. In the metal plate butt welding apparatus, when passing a steel plate, the lower shear is located below the pass line of the steel plate and the upper shear is located above the pass line of the steel plate so as not to contact the steel plate. On the other hand, when welding steel plates, the lower shear moves up to the pass line, the output side clamp and the input side clamp clamp the steel plate at the position of the pass line, and then lowers the upper shear to follow the preceding steel plate. Cut the steel plate. After cutting, the entry side clamp brings the succeeding steel plate closer to the exit side clamp so that the preceding steel plate is brought into contact with the preceding steel plate, and a current is passed between the preceding steel plate and the succeeding steel plate to make a temporary connection. After the temporary connection, the welding device moves the carriage carrying the lower shear, upper shear, welding device, grinding device, etc. in the plate width direction, and the welding device lasers the abutting part between the tail end of the preceding steel plate and the tip of the subsequent steel plate. Welding by irradiating

  Patent Document 2 discloses a laser beam welding apparatus including an output side clamp, an input side clamp, a lower cutting part, an upper cutting part, a cutting displacement suppression mechanism, a processing head, and the like. In the laser beam welding apparatus, when a steel plate is passed, the upper cutting portion and the lower cutting portion are positioned apart from each other up and down from the pass line. On the other hand, when the steel plate is cut, the lower cutting device rises to the rising end, and then the upper cutting device is lowered to cut the preceding steel plate and the subsequent steel plate at the same time. Subsequently, the cut end surface of the preceding steel plate and the cut end surface of the succeeding steel plate are brought into contact with each other and welded by irradiating a laser beam.

JP 2000-158189 A JP 2013-237057 A

  In order to obtain good welding, the butt portion between the tail end of the preceding steel plate and the tip of the following steel plate is always located within the beam diameter when the laser irradiation device moves in the plate width direction together with the carriage. Is essential. On the other hand, in general, a laser irradiation apparatus used in a laser welding apparatus is set so that a beam diameter at an irradiation point is extremely small (for example, 0.5 mm) in order to concentrate a laser output. Therefore, in order to always position the butt portion within the beam diameter, the preceding steel plate and the following steel plate are cut linearly along the plate width direction without being inclined with respect to the plate width direction, The cut end surface with the row steel plate is required to be perpendicular.

  However, in the metal plate butt welding apparatus disclosed in Patent Document 1 described above, it is difficult to cut the preceding steel plate and the succeeding steel plate in a straight line along the plate width direction or to cut the end surface at a right angle. There is a problem that. Specifically, the metal plate butt welding apparatus described above has an elevating mechanism that raises and lowers the lower shear, and when the steel plate is cut, cutting is performed at a position where the elevating mechanism raises the lower shear to the pass line. In order to raise and lower the lower shear by the elevating mechanism, play is required in the elevating mechanism. Therefore, the reaction force at the time of cutting when the upper shear moves down and cuts the steel sheet affects the lifting mechanism, so that the lower shear is inclined with respect to the plate width direction or the lower shear is submerged. Therefore, the tail end of the cut | disconnected preceding steel plate and the front-end | tip of a succeeding steel plate will incline with respect to a plate width direction, or the cut end surface will become diagonal.

On the other hand, the laser beam welding apparatus disclosed in Patent Document 2 described above includes a cutting displacement suppression mechanism that restrains the lower cutting device that has been raised to the rising end during cutting.
The cutting displacement suppression mechanism includes a first output pad provided on the lower cutting device side and an output side having a second output pad provided on the output clamp support frame side and in contact with the first output pad. A fixing means, and a first inlet pad provided on the lower cutting device side and an inlet side fixing means having a second inlet pad provided on the inlet clamp support frame side and in contact with the first inlet pad; ,have. In this displacement restraining mechanism during cutting, after the lower cutting device is lifted, the entry side clamp support frame is moved forward, so that the first exit pad and the second exit pad and the first entrance pad and the first The two entry-side pads are brought into contact with each other to restrain the lower cutting device. However, this displacement control mechanism at the time of cutting requires a cylinder to advance the entry side clamp support frame, which complicates the structure, or has a strength that can withstand the pressing force when the entry side clamp support frame advances. Manufacturing costs. Further, when the lower cutting device is lifted, the cutting displacement suppression mechanism presses the first outgoing pad with a guide roller in order to prevent interference between the first outgoing pad and the second outgoing pad. Therefore, the structure is further complicated, and there are problems in operability and maintainability.

  The present invention has been made in view of the above-described problems, and prevents tilting with respect to the plate width direction or slanting of the cut end surface, and the preceding steel plate and the succeeding steel plate are made to have a plate width. It aims at providing the steel plate welding apparatus which can perform favorable welding by cut | disconnecting linearly along a direction.

The steel plate welding apparatus of the present invention cuts the tail end of the preceding steel plate and the tip of the succeeding steel plate, and welds the butted portion of the cut tail end of the preceding steel plate and the cut tip of the succeeding steel plate. An inlet side fixed shear part fixed to the base part below the entrance side of the pass line through which the steel plate passes, and the base part fixed below the exit side of the pass line cut and arranged exit side fixed shear portion, the front Symbol trailing steel between the inlet side fixed Shah unit by lifting upward or found the entry-side fixing Shah portion of the inlet side of the pass line And an exit-side movable shear that cuts the preceding steel plate between the entrance-side movable shear portion and the exit-side fixed shear portion by moving up and down from the exit side of the pass line toward the exit-side fixed shear portion. and parts, by the exit-side fixing shear part and the exit-side movable shear section When cutting the serial preceding steel sheet, and the outlet side clamp portion for clamping the preceding steel sheet at the position of the upper end of the exit-side fixing shear portion, the cutting of the trailing steel sheet by the entry-side fixing Shah portion and the inlet-side movable shear section sometimes, the inlet side clamp portion for clamping the trailing steel sheet at the position of the upper end of the inlet-side fixed shear section, have a, the outlet side clamp portion has an exit-side lower clamp, the exit-side lower clamp And the exit-side fixed shear portion are formed with inclined surfaces at opposing positions, and the entrance-side clamp portion includes an entrance-side lower clamp, and the entrance-side lower clamp and the entrance-side fixed shear portion The inclined surface is formed at each facing position, and when the output side clamp portion clamps the preceding steel plate, the inclined surface of the output side lower clamp is in contact with the inclined surface of the output side fixed shear portion, The trailing steel plate has the entry side clamp portion. When the lamp, the inclined surface of the entering-side lower clamp is characterized in that contact with the inclined surface of the entering-side fixing shear section.
Further, the said outlet-side fixed shear section and the inlet side fixed shear portion, a outer cutter which is spaced apart in the sheet passing direction, the exit-side movable shear portion and entering-side movable shear section steel It is an inner blade which enters between the said exit side fixed shear part and the said entrance side fixed shear part at the time of cutting | disconnection.
Further, after cutting the steel plate by the exit side movable shear part and the exit side fixed shear part , and the entrance side movable shear part and the entrance side fixed shear part , the exit side clamp part and the entrance side clamp part are: Each of the steel plates to be clamped is moved up and down to the pass line, and at least one of the outlet side clamp part and the inlet side clamp part moves in the plate passing direction, and the tail end of the preceding steel sheet and the following steel sheet It is characterized by abutting the tip.
Also, a lower side of the inlet-side fixed shear portion and the outlet-side fixed shear portion, the mounting surface of the base portion, the exit-side fixing shear part and the exit-side movable shear section, and, entering-side movable It has the collection | recovery part which collect | recovers the fragments of the steel plate cut | disconnected by the shear part and the said entrance side fixed shear part .
In addition, the laser irradiation device for welding a butt portion between the tail end of the preceding steel plate and the tip of the succeeding steel plate, the laser irradiation device, the outlet fixed shear portion and the inlet fixed shear portion It is provided in the carriage part which moves in the plate width direction through the gap.
The carriage portion is a space that avoids interference between the carriage main body passing between the outlet fixed shear portion and the inlet fixed shear portion and the preceding steel plate and the following steel plate when moving in the plate width direction. And a mounting portion for mounting the laser irradiation device, which is connected to the carriage main body via the.
Moreover, the cutting method of the steel plate by the steel plate welding apparatus of the present invention cuts the tail end of the preceding steel plate and the tip of the succeeding steel plate, the tail end of the cut preceding steel plate and the tip of the succeeding steel plate cut A steel plate cutting method using a steel plate welding device for welding a butt portion, wherein the steel plate welding device is fixed to a base portion below an entrance side of a pass line through which a steel plate passes, and an entrance side fixed shear portion And an output-side fixed shear portion fixed to the base portion below the exit side of the pass line, and ascending and descending from the entrance side of the pass line toward the entrance-side fixed shear portion. The entrance-side movable shear portion that cuts the subsequent steel plate between the entrance-side fixed shear portion and the exit-side fixing by moving up and down from the exit side of the pass line toward the exit-side fixed shear portion. Cutting out the preceding steel plate with the shear part A movable shear portion, an output-side clamp portion that clamps the preceding steel plate at an upper end position of the output-side fixed shear portion when the preceding steel plate is cut by the output-side movable shear portion and the output-side fixed shear portion; An entry-side clamp part that clamps the succeeding steel sheet at the position of the upper end of the entry-side fixed shear part when the succeeding steel sheet is cut by the entry-side movable shear part and the entry-side fixed shear part, The output side clamp part has an output side lower clamp, and the output side lower clamp and the output side fixed shear part are formed with inclined surfaces at opposing positions, respectively, and the input side clamp part is an input side The inlet side lower clamp and the inlet side fixed shear part have inclined surfaces formed at opposing positions, respectively, and the outlet side clamp part clamps the leading steel plate when the outlet side clamp part clamps the leading steel plate. The inclined surface of the lower side clamp and the above A step in which the inclined surface of the side fixed shear portion is in contact, and an inclined surface of the inlet side lower clamp and an inclined surface of the inlet side fixed shear portion are in contact with each other when the incoming clamp portion clamps the subsequent steel plate. The step, the inclined surface of the exit-side lower clamp and the inclined surface of the exit-side fixed shear portion are in contact, and the inclined surface of the entrance-side lower clamp and the inclined surface of the entrance-side fixed shear portion are in contact, Cutting the preceding steel plate and the succeeding steel plate.
Furthermore, in addition to the cutting method described above, the welding method of the steel plate of the present invention includes a tail end of the clamped and cut preceding steel plate and a tip end of the clamped and cut subsequent steel plate on a pass line. They are connected by laser welding with each other.

  According to the present invention, it is possible to prevent tilting with respect to the plate width direction or oblique cutting of the end surface, and it is favorable by cutting the preceding steel plate and the succeeding steel plate linearly along the plate width direction. Welding can be performed. In particular, the cutting method of the present invention is excellent as a cutting method for performing butt welding by laser welding, and the steel plate welded by the welding method or welding apparatus of the present invention is excellent in continuous sheeting in a steel plate production line. .

It is a perspective view which shows the outline of a structure of the laser welding apparatus of 1st Embodiment. It is a figure which shows the outline of a structure of a laser welding apparatus. It is a figure for demonstrating the cutting clamp process by a laser welding apparatus. It is a figure for demonstrating the cutting process by a laser welding apparatus. It is a figure for demonstrating the cutting process by a laser welding apparatus. It is a figure for demonstrating the butt clamp process by a laser welding apparatus. It is a figure for demonstrating the welding process by a laser welding apparatus. It is a figure for demonstrating the drive mechanism of the clamp part by a laser welding apparatus. It is a figure which shows the outline of a structure of the laser welding apparatus of 2nd Embodiment. It is a figure for demonstrating the cutting process by a laser welding apparatus. It is a figure for demonstrating the butt clamp process by a laser welding apparatus.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. Here, the case where the laser welding apparatus as a steel plate welding apparatus is used is demonstrated.
<First Embodiment>
First, the outline of the laser welding apparatus 1 according to the present embodiment will be described with reference to FIG.
FIG. 1 is a perspective view showing the configuration of the laser welding apparatus 1.
The laser welding apparatus 1 includes a base portion 10, a clamp portion 20, a shear portion 30, a carriage portion 40, and the like. The base unit 10 is a casing as a structure that is fixed to the installation surface of the laser welding apparatus 1 and supports the clamp unit 20, the shear unit 30, and the carriage unit 40. The clamp part 20 waits in a position where it does not come into contact with the steel plate 2 being conveyed in the sheet passing direction (F direction shown in FIG. 1) in normal times, and the tail end of the preceding steel plate and the tip of the subsequent steel plate are to be cut. Then, the preceding steel plate and the succeeding steel plate are clamped. The shear unit 30 cuts the preceding steel plate and the subsequent steel plate clamped by the clamp unit 20. Moreover, the clamp part 20 butts the tail end of the cut | disconnected preceding steel plate, and the front-end | tip of the cut | disconnected succeeding steel plate. The carriage unit 40 is equipped with a laser irradiation device 42 and moves in the plate width direction (direction perpendicular to the plate passing direction F). At this time, the laser irradiation device 42 welds the preceding steel plate and the succeeding steel plate by irradiating the laser at the abutting portion between the tail end of the preceding steel plate and the tip of the succeeding steel plate.

  Next, specific configurations of the base body portion 10, the clamp portion 20, the shear portion 30, and the carriage portion 40 will be described with reference to FIGS. FIG. 2 is a diagram illustrating a state of the laser welding apparatus 1 when the steel plate 2 is being passed. FIG. 2A is a diagram of the laser welding apparatus 1 viewed from the plate direction. FIG. 2B is a cross-sectional view taken along the line II of FIG. FIG.2 (c) is the II-II sectional view taken on the line of Fig.2 (a). Hereinafter, a side where the steel plate 2 is carried into the laser welding apparatus 1 is referred to as an entry side, and a side where the steel plate 2 is carried out from the laser welding apparatus 1 is referred to as an exit side. The plate width direction orthogonal to the plate passing direction F is simply referred to as the width direction.

  The base portion 10 includes a base 11 (11a, 11b), a support column 12 (12a to 12d), and a top portion 13. The base 11 (11a, 11b) is fixed to the installation surface G. In the present embodiment, two bases 11a and 11b are arranged apart from each other in the plate passing direction. The support column 12 is erected on the base 11. In this embodiment, the columns 12a and 12b are erected from both sides of the base 11a, and the columns 12c and 12d are erected from both sides of the base 11b. The top 13 is fixed to the upper ends of the columns 12a to 12d. Further, as shown in FIG. 2B, the base portion 10 has a recovery portion 14 that recovers a piece of steel plate described later. The collection unit 14 is formed on the installation surface G between the base 11a and the base 11b, for example. Further, as shown in FIG. 2B, the base portion 10 has a guide portion 15 when the carriage portion 40 moves in the width direction within the base portion 10. Here, the guide part 15 is arrange | positioned above the bases 11a and 11b.

The clamp unit 20 includes an output side clamp unit 21 and an input side clamp unit 24.
The output side clamp part 21 has an output side upper clamp 22 and an output side lower clamp 23. The output-side upper clamp 22 and the output-side lower clamp 23 can be moved up and down by a drive mechanism 50 described later, and can advance and retreat in the plate passing direction. The exit-side upper clamp 22 and the exit-side lower clamp 23 are separated above and below the pass line (PL shown in FIGS. 2B and 2C) through which the steel plate 2 passes so as not to contact the steel plate 2 when passing. Wait at position. The exit-side upper clamp 22 and the exit-side lower clamp 23 clamp the preceding steel plate 3 from above and below and move the preceding steel plate 3 to a predetermined cutting position when cutting.
The entry side clamp portion 24 has an entry side upper clamp 25 and an entry side lower clamp 26. The entry-side upper clamp 25 and the entry-side lower clamp 26 can be moved up and down by a drive mechanism 50 described later, and can advance and retreat in the plate passing direction. The entrance-side upper clamp 25 and the entrance-side lower clamp 26 stand by at a position apart above and below the pass line through which the steel plate 2 passes so as not to contact the steel plate during passing. The entry-side upper clamp 25 and the entry-side lower clamp 26 clamp the trailing steel plate 4 from above and below, and move the trailing steel plate 4 to a predetermined cutting position when cutting.

Here, a drive mechanism 50 that raises and lowers the output side clamp portion 21 and the input side clamp portion 24 in the vertical direction and advances and retracts in the plate passing direction will be described with reference to FIG. Here, only the drive mechanism 50 of the output side clamp part 21 will be described, but the drive mechanism 50 of the input side clamp part 24 can be similarly configured. FIG. 8A is a view of the drive mechanism 50 of the output side clamp portion 21 as viewed from the plate passing direction. FIG. 8B is a cross-sectional view taken along line IV-IV.
The drive mechanism 50 of the output side clamp part 21 has a frame part 51, an upper lifting / lowering driving part 52, a lower lifting / lowering driving part 53, and a forward / backward driving part 54. The frame portion 51 is formed in a hollow rectangular shape that opens in the plate passing direction. The frame portion 51 is configured to be movable along the plate passing direction with respect to the base body portion 10. For example, by forming the base 11a so as to extend to the exit side, the frame portion 51 can move while being guided along the plate direction through the upper surface of the base 11a. Further, an upper lifting drive unit 52 is coupled to the upper side of the frame portion 51, and a lower lifting drive unit 53 is coupled to the lower side of the frame portion 51. Further, an advance / retreat drive unit 54 is coupled to the lower side and the outgoing side of the frame unit 51.
In the figure, for the sake of simplicity, each of the upper and lower drive units 52, the lower drive unit 53, and the advance / retreat drive unit 54 is provided, but a plurality of each may be provided.

The up / down drive unit 52 is, for example, a moving cylinder, and raises / lowers the output-side upper clamp 22 up and down. Moreover, the lower raising / lowering drive part 53 is a cylinder for a movement, for example, Comprising: The exit lower clamp 23 is raised / lowered up and down. The exit-side upper clamp 22 and the exit-side lower clamp 23 can be raised and lowered while being maintained in a horizontal state by being guided along the frame portion 51.
The advance / retreat drive unit 54 is, for example, a moving cylinder, and is fixed to the base unit 10. For example, the advancing / retreating drive unit 54 can be installed on the upper surface of the base 11a by forming the base 11a so as to extend outward. The advance / retreat drive unit 54 can move the output side upper clamp 22 and the output side lower clamp 23 forward and backward in the plate direction by moving the frame portion 51 in the plate direction. In order to raise and lower the exit-side upper clamp 22 and exit-side lower clamp 23 and advance and retract the frame portion 51 smoothly and precisely, a guide groove or the like may be formed in each.

Next, the shear part 30 has an upper shear part 31 and a lower shear part 34. In the shear portion 30 of this embodiment, only the upper shear portion 31 is raised and lowered, and the lower shear portion 34 is fixedly disposed on the base portion 10. That is, in the present embodiment, the upper shear portion 31 corresponds to a movable shear portion, and the lower shear portion 34 corresponds to a fixed shear portion.
The upper shear portion 31 is arranged to be movable up and down via a moving cylinder (not shown) fixed to the top portion 13 of the base portion 10. The upper shear portion 31 has an outgoing upper blade 32 that cuts the preceding steel plate 3 and an incoming upper blade 33 that cuts the subsequent steel plate 4. In this embodiment, at the time of cutting, the upper shear portion 31 cuts the steel sheet by entering (inner side) between an output-side lower shear portion 35 and an entry-side lower shear portion 37 described later of the lower shear portion 34. Therefore, the upper shear portion 31 is configured as an inner blade.
The upper shear portion 31 is positioned above the pass line so as not to come into contact with the steel plate 2 at the time of passing, and the leading steel plate 3 and the subsequent steel plate 4 are moved down to the lower shear portion 34 over the pass line at the time of cutting. Disconnect.

On the other hand, the lower shear portion 34 is fixed to the base portion 10. That is, unlike the conventional welding apparatus, the lower shear portion 34 of the present embodiment is disposed so as not to be lifted and lowered with respect to the base body portion 10. Specifically, the lower shear portion 34 includes an exit-side lower shear portion 35 and an entry-side lower shear portion 37. The outgoing lower shear portion 35 has an outgoing lower blade 36 that cuts the preceding steel plate 3. Further, the outlet lower shear portion 35 is fixed on the base 11 a of the base portion 10. The entry-side lower shear portion 37 has an entry-side lower blade 38 that cuts the subsequent steel plate 4. The entry-side lower shear portion 37 is fixed on the base 11 b of the base body portion 10. In the present embodiment, the outgoing lower shear portion 35 corresponds to the outgoing fixed shear portion, and the incoming lower shear portion 37 corresponds to the incoming fixed shear portion. Further, when cutting, the lower shear portion 34 cuts the steel sheet by the upper shear portion 31 entering between the outgoing lower shear portion 35 and the incoming lower shear portion 37. Accordingly, the lower shear portion 34 is configured as an outer blade.
As described above, since only the upper shear portion 31 is raised and lowered, and the lower shear portion 34 is fixed to the base body portion 10, a lifting mechanism for the lower shear portion 34 is not necessary. Therefore, the reaction force when the upper shear portion 31 descends and cuts the preceding steel plate 3 and the succeeding steel plate 4 can be received by the base body portion 10 as a structure via the lower shear portion 34. That is, when the preceding steel plate 3 and the succeeding steel plate 4 are cut, no play occurs in the lower shear portion 34. Therefore, the preceding steel plate 3 and the succeeding steel plate 4 can be accurately cut linearly.
Further, the lower shearing portion 34 is arranged below the pass line so that it does not come into contact with the steel plate 2 when passing.

  In addition, the outgoing lower shear portion 35 and the incoming lower shear portion 37 are independently fixed to the base portion 10. Therefore, a large space 39 can be formed vertically between the exit-side lower shear portion 35 and the entry-side lower shear portion 37. Such a large space 39 not only allows the upper shear portion 31 to enter during cutting, but also secures a passage when the carriage portion 40 moves in the width direction during welding.

Next, the carriage unit 40 includes a mounting unit 41 and a carriage body 43. The carriage unit 40 is configured to be movable in the width direction via an advancing / retreating mechanism (not shown). As shown in FIG. 2A, the carriage portion 40 is connected to the mounting portion 41 and the carriage main body 43 at one end side when viewed from the plate passing direction, and between the mounting portion 41 and the carriage main body 43. The space 45 is substantially C-shaped. The space 45 is a space for avoiding interference with the preceding steel plate 3 and the following steel plate 4 that are abutted by the output side clamp portion 21 and the input side clamp portion 24 when the carriage portion 40 moves in the width direction during welding. is there.
The mounting unit 41 includes a laser irradiation device 42. As shown in FIG. 2A, the laser irradiation device 42 is attached to the base portion 10 side of the mounting portion 41 and is attached to the center of the mounting portion 41 in the plate passing direction as shown in FIG. Yes. The laser irradiation device 42 is set in advance so that the laser beam is irradiated downward and the irradiation point is at the height of the pass line. The laser irradiation device 42 is not limited to being attached to the center of the mounting portion 41 in the plate passing direction, and may be attached at a fixed position.

  The carriage body 43 is formed with a guided portion 44. The guided portions 44 are formed so as to protrude from both sides of the carriage body 43 in the plate passing direction. The guided portion 44 is guided by the guide portion 15 formed along the width direction of the base portion 10. Therefore, when the carriage unit 40 moves in the width direction during welding, the carriage unit 40 accurately moves linearly along the width direction by the guided portion 44 and the guide unit 15. Therefore, the laser irradiation point irradiated by the laser irradiation device 42 can also be moved linearly along the width direction.

Two rollers 46 and 47 are supported on the mounting portion 41 and the carriage body 43, respectively. The two rollers 46 of the mounting portion 41 are supported at a position below the mounting portion 41 and spaced apart in the plate passing direction with the laser irradiated by the laser irradiation device 42 interposed therebetween. On the other hand, the two rollers 47 of the carriage body 43 are supported at positions separated in the sheet passing direction with the laser interposed therebetween. The roller 46 and the roller 47 press the preceding steel plate 3 and the succeeding steel plate 4 from above and below while rotating when the carriage unit 40 moves in the width direction during welding. Therefore, the so-called corrugation of the steel plate, which occurs when the preceding steel plate 3 and the subsequent steel plate 4 are cut by the shear portion 30, can be suppressed, and the steel plate can be welded satisfactorily.
Further, in this embodiment, since the shear part 30 is attached to the base body part 10, it is not necessary to mount the shear part 30 on the carriage part 40.

Next, processing from cutting the preceding steel plate 3 and the succeeding steel plate 4 to welding by the laser welding apparatus 1 configured as described above will be described with reference to FIGS.
(Cutting clamp process)
The tail end of the preceding steel plate 3 is stopped at the entry side of the outgoing lower shear portion 35, and then the tip of the subsequent steel plate 4 to be welded to the preceding steel plate 3 is stopped at the exit side of the entry lower lower shear portion 37.
The exit-side upper clamp 22 and the exit-side lower clamp 23 are lifted and lowered from the top and bottom, respectively, from a position apart from the top and bottom across the pass line. Similarly, the entry-side upper clamp 25 and the entry-side lower clamp 26 are moved up and down from the standby state apart from the top and bottom of the pass line, and sandwich the succeeding steel plate 4 from above and below.

As described above, in the present embodiment, the lower shear portion 34 is fixed to the base portion 10 and does not move up and down. Therefore, in the present embodiment, as shown in FIG. 3, the output-side upper clamp 22 and the output-side lower clamp 23 are moved below the pass line in a state where the preceding steel plate 3 is sandwiched, and the preceding steel plate 3 is moved to the output side. It clamps by contacting the position of the lower shear part 35, specifically, the upper end of the outgoing lower shear part 35. Similarly, the entry-side upper clamp 25 and the entry-side lower clamp 26 move the trailing steel plate 4 below the pass line in a state where the trailing steel plate 4 is sandwiched, and the trailing steel plate 4 is moved to the position of the entry-side lower shear portion 37, specifically To the upper end of the entry-side lower shear portion 37 to be clamped.
In this way, the output side clamp portion 21 clamps the preceding steel plate 3 at the upper end of the lower shear portion 34, and the entry side clamp portion 24 clamps the subsequent steel plate 4 at the upper end of the lower shear portion 34, thereby lowering the lower shear portion. It is possible to shift to the cutting process without moving up and down 34.

  In the cutting clamp process, it is preferable that the output side lower clamp 23 and the output side lower shear portion 35 are in contact with each other, and the input side lower clamp 26 and the input side lower shear portion 37 are in contact with each other. Specifically, as shown in FIG. 3, the inclined surface 23 a and the inclined surface 35 a formed at positions where the output-side lower clamp 23 and the output-side lower shear portion 35 face each other are in contact with each other. Similarly, the inclined surface 26a and the inclined surface 37a, which are respectively formed at positions where the inlet-side lower clamp 26 and the inlet-side lower shear portion 37 face each other, are in contact with each other.

(Cutting process)
Next, as shown in FIG. 4, the upper shear portion 31 descends from above the pass line toward the lower shear portion 34. Accordingly, the preceding steel plate 3 is cut by the exit upper blade 32 of the upper shear portion 31 and the exit lower blade 36 of the exit lower shear portion 35, and the succeeding steel plate 4 enters the entrance upper blade 33 of the upper shear portion 31. It is cut by the entry side lower blade 38 of the side lower shear part 37. At this time, the reaction force when cutting the preceding steel plate 3 and the succeeding steel plate 4 is received by the base body portion 10 which is a structural body via the lower shear portion 34, so that the lower shear portion 34 is inclined with respect to the width direction. Or sinking. Therefore, the shear portion 30 can accurately cut the preceding steel plate 3 and the succeeding steel plate 4 in a straight line along the width direction so that the end surfaces of the preceding steel plate 3 and the succeeding steel plate 4 are at right angles. Can be cut.

Further, when the preceding steel plate 3 and the subsequent steel plate 4 are cut, a force pulled in the horizontal direction by the upper shear portion 31 acts on the preceding steel plate 3 and the succeeding steel plate 4. At this time, since the preceding steel plate 3 is clamped in a state in which the inclined surface 23a of the exit-side lower clamp 23 and the inclined surface 35a of the exit-side lower shear portion 35 are in contact with each other, the preceding steel plate 3 is pulled in the horizontal direction. Can be supported. Similarly, the succeeding steel plate 4 is clamped in a state where the inclined surface 26a of the entry-side lower clamp 26 and the inclined surface 37a of the entry-side lower shear portion 37 are in contact with each other. Can support being pulled.
Further, the broken pieces of the preceding steel plate 3 and the broken pieces of the succeeding steel plate 4 fall through the space 39 and are collected by the collecting unit 14. At this time, since the space 39 is formed to be large in the vertical direction, it is possible to secure a capacity that can sufficiently receive the fragments that have fallen on the collection unit 14. Next, as shown in FIG. 5, the upper shear portion 31 rises to the standby position above the pass line, and the process proceeds to the next butt clamp process.

(Butt clamp process)
Next, as shown in FIG. 6, the output side upper clamp 22 and the output side lower clamp 23 raise the preceding steel plate 3 to the pass line. Similarly, the entry-side upper clamp 25 and the entry-side lower clamp 26 raise the trailing steel plate 4 to the pass line.
Next, the exit-side upper clamp 22 and the exit-side lower clamp 23 move the preceding steel plate 3 toward the entry side while maintaining the height of the pass line. At the same time, the entry-side upper clamp 25 and the entry-side lower clamp 26 move the trailing steel plate 4 toward the exit side while maintaining the height of the pass line. That is, the exit side clamp part 21 moves the preceding steel plate 3 to the entry side, and the entry side clamp part 24 moves the succeeding steel plate 4 to the exit side. Therefore, the clamp portion 20 can abut the tail end of the preceding steel plate 3 and the tip of the succeeding steel plate 4 at the center of the length in the sheet passing direction in the space 39. The clamp portion 20 is not limited to the case where the tail end of the preceding steel plate 3 and the tip end of the succeeding steel plate 4 are abutted at the center of the length in the sheet passing direction in the space 39, and may be abutted at a certain position. For example, the clamp unit 20 moves only one of the output side clamp unit 21 and the input side clamp unit 24 in the plate passing direction and does not move the other, so that the tail end and the trailing end of the preceding steel plate 3 are moved. The front end of the steel plate 4 may be abutted.

Here, as described above, the preceding steel plate 3 and the succeeding steel plate 4 are cut linearly along the width direction. Therefore, when the clamp portion 20 abuts the tail end of the preceding steel plate 3 and the tip of the succeeding steel plate 4, the abutting portion between the tail end of the preceding steel plate 3 and the tip of the succeeding steel plate 4 extends along the width direction. The gap between both ends can be minimized and positioned in a straight line.
In addition, you may make the output side clamp part 21 move diagonally by performing simultaneously the operation | movement which raises the preceding steel plate 3 to a pass line, and the operation | movement which moves to the entrance side. Similarly, the entry side clamp part 24 may be moved obliquely by simultaneously performing the movement of raising the trailing steel plate 4 to the pass line and the movement of moving it to the exit side. Thus, the downtime can be shortened by moving it diagonally.

(Welding process)
Next, as shown in FIG. 7, the carriage unit 40 moves in the base unit 10 along the width direction. FIG. 7A is a diagram illustrating a state where the carriage unit 40 is moving along the width direction. FIG.7 (b) is sectional drawing which cut | disconnected the III-III line | wire of Fig.7 (a).
The laser irradiation device 42 irradiates the laser downward while the carriage unit 40 moves along the width direction at a predetermined moving speed. At this time, since the carriage part 40 is guided by the guide part 15 and the guided part 44, it moves linearly along the width direction of the base part 10. Further, as described above, the abutting portion between the tail end of the preceding steel plate 3 and the tip of the subsequent steel plate 4 is linearly positioned along the width direction. Therefore, the laser irradiation device 42 that moves in conjunction with the carriage unit 40 always matches the abutting portion between the tail end of the preceding steel plate 3 and the tip of the subsequent steel plate 4 and the laser irradiation point along the width direction. Can be irradiated. Therefore, the laser irradiation apparatus 42 can weld the preceding steel plate 3 and the succeeding steel plate 4 well over the entire width of the preceding steel plate 3 and the succeeding steel plate 4. Moreover, since the end surface of the tail end of the preceding steel plate 3 and the tip of the succeeding steel plate is cut at a right angle, the end surfaces are the plates at the abutting portion between the tail end of the preceding steel plate 3 and the tip of the succeeding steel plate 4. Contact is made at any position in the thickness direction. Therefore, when the laser is irradiated by the laser irradiation device 42, the preceding steel plate 3 and the succeeding steel plate 4 can be welded well over the thickness direction of the butted portion.

  After the laser irradiation device 42 is welded over the entire width of the preceding steel plate 3 and the succeeding steel plate 4, the carriage unit 40 returns to the position shown in FIG. Moreover, the exit side clamp part 21 and the entrance side clamp part 24 cancel | release the clamp of a steel plate, and return to the position shown in FIG.2 (b). Thus, by returning the carriage part 40 and the clamp part 20, the laser welding apparatus 1 can be let through without contacting the welded steel sheet, and can be prepared for the next welding.

As described above, according to the present embodiment, only the upper shear portion 31 is raised and lowered, and the lower shear portion 34 is fixed to the base body portion 10, so that the lifting mechanism for the lower shear portion 34 is not necessary. That is, the reaction force when the upper shear portion 31 descends and cuts the preceding steel plate 3 and the subsequent steel plate 4 can be received by the base body portion 10 which is a structure through the lower shear portion 34. Accordingly, when the preceding steel plate 3 and the succeeding steel plate 4 are cut, the lower shear portion 34 does not tilt or sink with respect to the width direction. Can be cut along a straight line. By cutting in a straight line, the abutting portion between the tail end of the preceding steel plate 3 and the tip of the succeeding steel plate 4 can be made linear along the width direction. The preceding steel plate 3 and the succeeding steel plate 4 can be welded satisfactorily.
The steel plate welded by the welding process of the present invention has no danger due to welding unevenness or fracture, and has characteristics such as a small heat-affected zone which is an advantage of laser welding. Excellent boardability.

<Second Embodiment>
In the first embodiment described above, a case has been described in which only the upper shear portion 31 is raised and lowered, and the lower shear portion 34 is fixed to the base body portion 10. In the present embodiment, the case in which the upper shear portion 31 and the lower shear portion 34 of the first embodiment are turned upside down, the upper shear portion 131 is fixed to the base body portion 110, and only the lower shear portion 136 moves up and down will be described. To do. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted.
FIG. 9 is a diagram showing a configuration of the laser welding apparatus 101 of the present embodiment.

The laser welding apparatus 101 includes a base portion 110, a shear portion 130, and the like.
The base portion 110 has a base 111, a support column 112, and a top portion 113.
The shear portion 130 of this embodiment has an upper shear portion 131 and a lower shear portion 136. In the shear part 130 of this embodiment, the upper shear part 131 is fixed to the base part 110 and only the lower shear part 136 is raised and lowered. That is, in this embodiment, the lower shear part 136 corresponds to a movable shear part, and the upper shear part 131 corresponds to a fixed shear part.

  The upper shear part 131 has an exit-side upper shear part 132 and an entry-side upper shear part 134. The exit-side upper shear part 132 has an exit-side upper blade 133 that cuts the preceding steel plate 3. Further, the exit upper shear portion 132 is fixed to the exit side on the lower surface of the top portion 113. The entry-side upper shear part 134 has an entry-side upper blade 135 that cuts the subsequent steel plate 4. The entry-side upper shear part 134 is a lower surface of the top part 113 and is fixed to the entry side. In the present embodiment, the output-side upper shear part 132 corresponds to the output-side fixed shear part, and the input-side upper shear part 134 corresponds to the input-side fixed shear part. Further, at the time of cutting, the upper shear part 131 cuts the steel sheet by the lower shear part 136 entering between the outgoing upper shear part 132 and the incoming upper shear part 134. Therefore, the upper shear part 131 is configured as an outer blade.

On the other hand, the lower shear portion 136 is arranged to be movable up and down via a moving cylinder (not shown) fixed to the base 111 of the base body portion 110. The lower shear portion 136 has an output-side lower blade 137 that cuts the preceding steel plate 3 and an entry-side lower blade 138 that cuts the subsequent steel plate 4. In this embodiment, the lower shear part 136 cuts the steel sheet by entering between the outlet upper shear part 132 and the inlet upper shear part 134 (inside) of the upper shear part 131 at the time of cutting. Therefore, the lower shear portion 136 is configured as an inner blade.
The lower shear portion 136 is positioned below the pass line so as not to contact the steel plate 2 when passing, and the leading steel plate 3 and the subsequent steel plate 4 are moved up to the upper shear portion 131 over the pass line when cutting. Disconnect.

  Thus, since only the lower shear part 136 is raised and lowered, and the upper shear part 131 is fixed to the base part 110, the raising and lowering mechanism of the upper shear part 131 is unnecessary. Therefore, the reaction force when the lower shear portion 136 is raised and the preceding steel plate 3 and the subsequent steel plate 4 are cut can be received by the base body portion 110 that is a structural body via the upper shear portion 131. That is, when the preceding steel plate 3 and the succeeding steel plate 4 are cut, no play occurs in the upper shear portion 131, so that the preceding steel plate 3 and the succeeding steel plate 4 can be accurately cut linearly.

Next, processing from cutting the preceding steel plate 3 and the succeeding steel plate 4 to welding with the laser welding apparatus 101 configured as described above will be described with reference to FIGS. Note that description of processing similar to that of the first embodiment is omitted as appropriate.
(Cutting clamp process)
In the present embodiment, the output-side upper clamp 22 and the output-side lower clamp 23 are moved upward from the pass line in a state where the preceding steel plate 3 is sandwiched, and the preceding steel plate 3 is moved to the position of the output-side upper shear portion 132, specifically Are clamped by contacting the lower end of the exit upper shear 132. Similarly, the entry-side upper clamp 25 and the entry-side lower clamp 26 move the succeeding steel plate 4 above the pass line while sandwiching the succeeding steel plate 4 so that the succeeding steel plate 4 is positioned at the position of the entrance upper shear portion 134, specifically To the lower end of the entry-side upper shear section 134 and clamp.

(Cutting process)
Next, as shown in FIG. 10, the lower shear portion 136 rises from below the pass line toward the upper shear portion 131. Accordingly, the preceding steel plate 3 is cut by the outlet upper blade 133 of the upper shear portion 131 and the outlet lower blade 137 of the lower shear portion 136, and the succeeding steel plate 4 is cut by the inlet upper blade 135 and the lower shear portion of the upper shear portion 131. 136 is cut by an entry side lower blade 138. At this time, the reaction force when cutting the preceding steel plate 3 and the succeeding steel plate 4 is received by the base body portion 110 which is a structure through the upper shear portion 131, so that the upper shear portion 131 is inclined with respect to the width direction. And does not float up. Therefore, the shear portion 130 can accurately cut the preceding steel plate 3 and the succeeding steel plate 4 along the width direction so that the end surfaces of the preceding steel plate 3 and the succeeding steel plate 4 are at right angles. Can be cut.

In the cutting process, the preceding steel plate 3 is clamped in a state where the inclined surface 22a of the output-side upper clamp 22 and the inclined surface 132a of the output-side upper shear portion 132 are in contact with each other. It can support being pulled horizontally. Similarly, the succeeding steel plate 4 is clamped in a state where the inclined surface 25a of the entry-side upper clamp 25 and the inclined surface 134a of the entry-side upper shear portion 134 are in contact with each other. It can support being pulled in the direction.
Next, the lower shear part 136 is lowered to the standby position below the pass line, and the process proceeds to the butt clamp process.

(Butt clamp process)
Next, as shown in FIG. 11, the output side upper clamp 22 and the output side lower clamp 23 move the preceding steel plate 3 toward the input side at the height of the pass line. At the same time, the entrance-side upper clamp 25 and the entrance-side lower clamp 26 move the trailing steel plate 4 toward the exit side at the height of the pass line. That is, the output side clamp portion 21 and the input side clamp portion 24 abut the tail end of the preceding steel plate 3 and the tip of the subsequent steel plate 4.

(Welding process)
Next, the carriage unit 40 moves in the base unit 110 along the width direction. The laser irradiation device 42 irradiates the laser downward while the carriage unit 40 moves along the width direction at a predetermined moving speed. In the present embodiment, the upper and lower shear portions 31 and 34 of the first embodiment are turned upside down, but the laser irradiation device 42 is not set to irradiate the laser upward. It is not necessary to turn the carriage part 40 upside down. Accordingly, the laser irradiation device 42 moves along the width direction of the base portion 110 while irradiating the laser downward as in the state shown in FIGS. 2 (a) and 2 (b).
Also in this embodiment, since the preceding steel plate 3 and the succeeding steel plate 4 can be linearly cut along the width direction as in the first embodiment, the tail end of the preceding steel plate 3 and the following steel plate 4 The abutting portion with the tip can be made linear along the width direction, and the preceding steel plate 3 and the succeeding steel plate 4 can be welded well over the entire width of the preceding steel plate 3 and the succeeding steel plate 4.

  Further, in the present embodiment, since the lower shear portion 136 is configured to move up and down, a moving cylinder for moving the lower shear portion 136 up and down is arranged close to the installation surface G. Therefore, the second embodiment is easier to repair the moving cylinder than the case where the moving cylinder for raising and lowering the upper shear portion 31 is arranged on the top portion 113 as in the first embodiment. The maintainability of the laser welding apparatus 101 is excellent.

  Here, 1st Embodiment demonstrated the case where the upper shear part 31 comprised as an inner blade was raised / lowered, 2nd Embodiment demonstrated the case where the lower shear part 136 comprised as an inner blade was raised / lowered. . Table 1 summarizes the first embodiment and the second embodiment.

  In both the first embodiment and the second embodiment, only the movable shear portion is raised and lowered, and the fixed shear portion is fixed to the base portion, so that the lifting mechanism for the fixed shear portion is unnecessary. Therefore, the reaction force when the movable shear portion moves up and down and cuts the preceding steel plate 3 and the subsequent steel plate 4 can be received by the base body portion which is a structure through the fixed shear portion. Therefore, when the preceding steel plate 3 and the succeeding steel plate 4 are cut, the fixed shear portion does not tilt or rise and sink with respect to the width direction, so that the preceding steel plate 3 and the following steel plate 4 are aligned along the width direction. Can be cut straight.

  Note that, as in the first embodiment, only the upper shear portion 31 is raised and lowered, and the lower shear portion 34 is fixed to the base portion 10, so that the fragments of the preceding steel plate 3 and the subsequent steel plate 4 that have been cut. It is more preferable to apply the first embodiment because it is possible to secure a wide capacity of the collecting unit 14 that collects the water.

As mentioned above, although this invention was demonstrated by embodiment mentioned above, this invention is not limited only to embodiment mentioned above, It changes within the range of this invention, or combines embodiment mentioned above suitably. May be.
For example, in the first embodiment, the case where the collection unit 14 is formed on the installation surface G between the base 11a and the base 11b has been described, but the installation surface G between the base 11a and the base 11b is described. A collection container as a collection unit may be installed.
The preceding steel plate 3 and the succeeding steel plate 4 are not limited to the same thickness, and the thickness may be different. In this case, in the above-described clamp part process, the exit-side upper clamp 22 and the exit-side lower clamp 23 position the center of the plate thickness of the preceding steel plate 3 at the height of the pass line, and the entry-side upper clamp 25 and the entry-side lower clamp. No. 26 positions the center of the thickness of the succeeding steel plate 4 at the height of the pass line, so that the preceding steel plate 3 and the succeeding steel plate 4 can be favorably welded in the welding process.

  1: Laser welding device (steel plate welding device) 2: Steel plate 3: Leading steel plate 4: Subsequent steel plate 10: Base portion 14: Collection portion 20: Clamp portion 21: Outlet side clamp portion 22: Outlet side upper clamp 23: Outlet side Lower clamp 24: Input side clamp part 25: Input side upper clamp 26: Input side lower clamp 30: Shear part 31: Upper shear part 34: Lower shear part 35: Outlet lower shear part 37: Input side lower shear part 40: Carriage part 41: Mounting part 42: Laser irradiation apparatus 43: Carriage body 101: Laser welding apparatus (steel plate welding apparatus) 110: Base part 130: Shear part 131: Upper shear part 132: Outer upper shear part 134: Incoming upper part Shear part 136: Lower shear part

Claims (8)

A steel plate welding apparatus for cutting a tail end of a preceding steel plate and a tip of a succeeding steel plate, and welding a butted portion between the tail end of the cut preceding steel plate and the tip of the succeeding steel plate cut,
And the inlet side fixed shear section steel is arranged fixedly to the base portion below the inlet side of the pass line passing plate,
An exit-side fixed shear portion fixed to the base portion below the exit side of the pass line; and
And the entry side movable shear unit for cutting the pre-Symbol trailing steel between the inlet side fixed Shah unit by lifting upward or found the entry-side fixing Shah portion of the inlet side of the pass line,
An exit-side movable shear portion that cuts the preceding steel plate with the exit-side fixed shear portion by moving up and down from the exit side of the pass line toward the exit-side fixed shear portion;
An exit-side clamp portion that clamps the preceding steel plate at an upper end position of the exit-side fixed shear portion when the preceding steel plate is cut by the exit-side movable shear portion and the exit-side fixed shear portion;
Wherein upon cleavage of the trailing steel sheet according to the entry side and the movable shear portion the inlet side fixed shear section, have a, and inlet side clamp portion for clamping in position of the upper end of the trailing steel sheet wherein the entry-side fixing Shah unit,
The exit side clamp portion has an exit side lower clamp,
The outgoing side lower clamp and the outgoing side fixed shear part are formed with inclined surfaces at opposing positions, respectively.
The entry side clamp part has an entry side lower clamp,
The entry side lower clamp and the entry side fixed shear part are formed with inclined surfaces at opposing positions, respectively.
When the output side clamp portion clamps the preceding steel plate, the inclined surface of the output side lower clamp is in contact with the inclined surface of the output side fixed shear portion,
The steel plate welding apparatus , wherein when the entry side clamp portion clamps the succeeding steel plate, the inclined surface of the entry side lower clamp is in contact with the inclined surface of the entry side fixed shear portion . Wherein the exits side fixing shear portion and the inlet-side fixed shear portion, a outer cutter which is spaced apart in the sheet passing direction,
The exit-side movable shear part and the entry-side movable shear part are inner blades that enter between the exit-side fixed shear part and the entry-side fixed shear part when a steel plate is cut. The steel plate welding apparatus according to 1. After cutting the steel sheet by the exit side movable shear part and the exit side fixed shear part , and the entrance side movable shear part and the entrance side fixed shear part ,
The output side clamp part and the input side clamp part move the steel plate to be clamped up and down to the pass line, and at least one of the output side clamp part and the input side clamp part moves in the plate passing direction. , steel welding apparatus according to claim 1 or 2, characterized in that to match the tip of the tail and the rear row steel of the preceding steel sheet. A lower side of the inlet-side fixed shear portion and the outlet-side fixed shear portion, the mounting surface of the base portion, the exit-side fixing shear part and the exit-side movable shear section and the entering-side movable shear section The steel plate welding apparatus according to any one of claims 1 to 3, further comprising a recovery portion that recovers fragments of the steel plate cut by the entry-side fixed shear portion . A laser irradiation apparatus for welding a butt portion between a tail end of the preceding steel plate and a tip of the succeeding steel plate;
The laser irradiation apparatus, one of claims 1 to 4, characterized in that provided on the carriage unit for moving the plate width direction through between the exit side fixing shear part and the entering-side fixing shear section The steel plate welding apparatus of Claim 1. The carriage part is interposed between a carriage body that passes between the outlet fixed shear part and the inlet fixed shear part, and a space that avoids interference between the preceding steel sheet and the following steel sheet when moving in the plate width direction. A steel plate welding apparatus according to claim 5 , further comprising a mounting portion connected to the carriage main body and mounting the laser irradiation device. A steel plate cutting method using a steel plate welding apparatus that cuts a tail end of a preceding steel plate and a tip end of a succeeding steel plate and welds a butt portion between the tail end of the cut preceding steel plate and the tip of the succeeding steel plate. And
The steel plate welding apparatus is
An entry-side fixed shear part fixed to the base part below the entry side of the pass line through which the steel plate passes, and
An exit-side fixed shear portion fixed to the base portion below the exit side of the pass line; and
An entry-side movable shear portion that cuts the subsequent steel plate with the entry-side fixed shear portion by moving up and down from the entry-side upper side of the pass line toward the entry-side fixed shear portion;
An exit-side movable shear portion that cuts the preceding steel plate with the exit-side fixed shear portion by moving up and down from the exit side of the pass line toward the exit-side fixed shear portion;
An exit-side clamp portion that clamps the preceding steel plate at an upper end position of the exit-side fixed shear portion when the preceding steel plate is cut by the exit-side movable shear portion and the exit-side fixed shear portion;
An entry side clamp part that clamps the succeeding steel sheet at the position of the upper end of the entry side fixed shear part when the succeeding steel sheet is cut by the entry side movable shear part and the entry side fixed shear part;
The exit side clamp portion has an exit side lower clamp,
The outgoing side lower clamp and the outgoing side fixed shear part are formed with inclined surfaces at opposing positions, respectively.
The entry side clamp part has an entry side lower clamp,
The entry side lower clamp and the entry side fixed shear part are formed with inclined surfaces at opposing positions, respectively.
A step of contacting the inclined surface of the output side lower clamp and the inclined surface of the output side fixed shear portion when the output side clamp portion clamps the preceding steel plate;
A step in which the inclined surface of the inlet-side lower clamp and the inclined surface of the inlet-side fixed shear portion come into contact with each other when the incoming-side clamp portion clamps the subsequent steel plate;
In the state where the inclined surface of the exit-side lower clamp and the inclined surface of the exit-side fixed shear portion are in contact, and the inclined surface of the entrance-side lower clamp and the inclined surface of the entrance-side fixed shear portion are in contact, the preceding steel plate And a step of cutting the subsequent steel plate. A method of cutting a steel plate by a steel plate welding apparatus. In addition to the steel sheet cutting method according to claim 7 , the tail end of the preceding steel sheet clamped and cut and the front edge of the subsequent steel sheet clamped and cut are butted on a pass line. A method for welding steel sheets, wherein the welding is performed by laser welding.

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