JP4489285B2 - Seam welding apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seam welding apparatus and a method for seam welding end portions of two blanks, and can be used when the thicknesses of the two blanks are different.
[0002]
[Background]
When seam welding is performed between the overlapping ends of two blanks, these blanks are set in a seam welding apparatus with the ends overlapped, and a seam welding machine provided in the seam welding apparatus is provided. By advancing back and forth, the ends are seam welded. Then, the finished product produced from the two blanks is transported to another place, and the finished products produced sequentially by the seam welding apparatus are laminated at this place.
[0003]
[Problems to be solved by the invention]
In the above, when the two blanks have different thicknesses, when a large number of finished products are laminated, a portion where a thick blank is laminated and a blank with a small thickness are laminated. In the portion, a difference in height corresponding to the total difference in thickness of the blank is generated.
[0004]
According to this, when a large number of finished products are sequentially sucked and transported from the uppermost finished product to the pressing process etc. by the transport means having the suction tool, the entire finished product is not horizontal, Since there is a difference in height between the blank portion having a large thickness and the blank portion having a small thickness, there is a possibility that a plurality of suction tools provided in the conveying means corresponding to these portions cannot be sucked as predetermined.
[0005]
The object of the present invention is to seam weld the ends of two blanks having different thicknesses, and when the finished products produced thereby are laminated, Almost horizontal The present invention provides a seam device and a method thereof that can be laminated with each other.
[0006]
[Means for Solving the Problems]
The seam welding apparatus according to the present invention is capable of moving forward and backward, and in the seam welding apparatus having a seam welding machine that seams welds the overlapping ends of two blanks by the forward and backward movement, Protrusions for forming protrusions on the blanks with the small thickness of the two blanks in the areas where the thicknesses of the blanks are seam welded by the seam welder. The forming means is arranged.
[0007]
According to this seam welding apparatus, projections are formed by projection forming means on a blank having a small thickness forming a finished product in the welding area. Therefore, when a large number of finished products are stacked, Among them, the thick blank portion and the thin blank portion can have the same or almost the same height, and the entire finished product is in a horizontal state or a substantially horizontal state. Can be sucked and conveyed sequentially from the top finished product.
[0008]
In this seam welding apparatus, the projection forming means may operate each time a finished product is produced from two blanks by seam welding with a seam welding machine, and a predetermined number of finished products are produced from the two blanks. May be activated every time.
[0009]
Assuming the latter, a multi-layered finished product has a protrusion formed and a protrusion not formed, and a protrusion is formed between the finished products with protrusions. Since the finished product is not present, even if the protrusion protrudes downward and the upper surface is depressed, it is possible to prevent the protrusions from fitting together and lowering the height position of the blank portion having a small thickness.
[0010]
In the seam welding method according to the present invention, the thickness of the two blanks is different in the seam welding method in which the end portions of the two blanks overlapped with each other by a seam welding machine that moves forward and backward. The seam welding is completed by the advanced seam welder, and the seam welder is moved to return to the retracted position to the blank having the small thickness among the two blanks clamped by the clamping device. The protrusions are formed by the protrusion forming means when in contact.
[0011]
According to this seam welding method, since the seam welding by the advanced seam welder is completed and the seam welder returns to the retracted position, the protrusion is formed into a thin blank by the protrusion forming means. Thus, effective use of the work time is achieved, and the overall work time does not become longer. Further, since the two blanks are clamped by the clamping device at the time of forming the protrusion, the protrusion can be formed at a predetermined position of the finished product made of these blanks.
[0012]
Also in this seam welding method, the formation of protrusions by the protrusion forming means may be performed every time a finished product is produced from two blanks by seam welding with a seam welding machine, and a predetermined number of finished products from two blanks. May be performed each time the is produced.
[0013]
A large number of finished products produced by seam welding of two blanks are stacked in an area different from the area where the seam welding was performed, and the protrusions formed on the blank having a small thickness by the protrusion forming means protrude downward. If the upper surface is depressed, the protrusions are formed by the protrusion forming means every time a predetermined number of finished products are produced.
[0014]
Thereby, it can eliminate that protrusions fit and the height position of the blank part with small thickness in a finished product falls.
[0015]
In the present invention described above, the protrusion forming means may generate a driving force for forming protrusions on a thin blank with a cylinder or with a solenoid, and its structure, type, etc. are arbitrary. is there.
[0016]
In the present invention described above, the seam welding by the seam welding machine may be mash seam welding that crushes the overlapping ends of two blanks or may be normal seam welding that does not crush.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The seam welding apparatus according to this embodiment is for producing a finished sheet metal product to be a part of a car body of an automobile by joining a plurality of blanks by mash seam welding.
[0018]
FIG. 1 is a conceptual plan view showing the arrangement position of each area forming each part of the seam welding apparatus in order to explain the overall configuration of the seam welding apparatus according to the present embodiment. A standby area B is provided adjacent to the side of the welding area A for seam welding a plurality of blanks until the blanks are fed into the welding area A. Areas C and D are provided at positions before and after the standby area B and deviated from the position next to the welding area A. Of these, the area C is an advance area of the blank supply cart, D is the forward area of the finished product dispensing cart. The blank supply carriage advance area C is connected to the blank supply carriage retreat areas E and F in a positional relationship perpendicular to the area C, and the finished product dispensing area D is also perpendicular to the area D. Are connected to the retreat areas G and H of the finished product dispensing cart.
[0019]
The standby areas B are provided at two locations on the left and right sides of the welding area A, and a plurality of blanks to be seam welded from these standby areas B are alternately fed into the welding area A. Area C, area D, area E, F, and areas G, H are also arranged at two locations that are symmetrical with respect to welding area A. Accordingly, two areas B to H except for the welding area A are provided.
[0020]
FIG. 2 is a plan view of the entire seam welding apparatus according to the present embodiment having the respective areas shown in FIG. 1, and the blank and finished product moving means in the areas B to H are each one side of the welding area A. The same applies to these areas B to H provided in pairs.
[0021]
Explaining this moving means, between the area C and the areas E and F, two blank supply carts 10 are guided by the rails 11 and are reciprocally arranged, and are joined by seam welding in the areas E and F. A large number of blanks W1 and W2 forming a set of two powers are separated from each other and loaded on the carriage 10 and the carriage 10 advances to the area C, so that the blanks W1 and W2 are supplied to the advance area C. The configuration of the carriage 10 is shown in FIGS. 3 and 6. On the carriage 10 that has reached the area C, the transport body 30 is reciprocally arranged in the arrangement direction of the area C, the area B, and the area D, and the transport body 30 moves from the area C side to the area D side. The blanks W1 and W2 are conveyed to the standby area B, and the finished product Y produced from the blanks W1 and W2 in the area A and returned to the standby area B is conveyed to the area D. The structure of the conveyance body 30 is shown in FIGS. Between the area D and the areas G and H, two finished product delivery carts 20 are guided by the rails 21 so as to be freely reciprocated. When the cart 20 moves forward to the area D, the cart 20 is moved from the carrier 30 to the cart 20. When the finished product Y is delivered to the vehicle and the carriage 20 moves back to the areas G and H, the finished product Y is carried out of the carriage 20 to another place. The configuration of the carriage 20 is shown in FIGS. 3 and 6.
[0022]
Between the standby area B and the welding area A, a transfer table 70 is disposed so as to reciprocate horizontally. When the transfer table 70 reaches the standby area B, blanks W1, W2 are transferred from the carrier 30 to the transfer table 70. When supplied and the transfer table 70 moves to the welding area A, these blanks W1 and W2 are seam welded by a seam welder 130 that can move forward and backward with respect to the welding area A. Mash seam welded. Thereby, the finished product Y in which the thickness of the welded portion is smaller than the total thickness of the blanks W1 and W2 is produced. When the transfer table 70 returns to the original standby area B, the finished product Y is returned from the welding area A to the standby area B, and the finished product Y is transported to the area D by the transport body 30. The transfer table 70 is shown in FIG. The seam welder 130 is shown in FIGS.
[0023]
FIG. 3 is a side view of the seam welding apparatus. The blank supply carriage 10 and the finished product dispensing carriage 20 travel on the rails 11 and 21 by wheels 12 and 22. This traveling is performed by the drive device 13 mounted on the carts 10 and 20, and FIG. 6 shows this drive device 13. The drive device 13 includes a servo motor 14, a rotary shaft 18 connected to a drive shaft of the servo motor 14 via a sprocket 15, a chain 16, and a sprocket 17, a pinion 19 fixed to the rotary shaft 18, The rack 23 is engaged with the pinion 19. The rotating shaft 18 is rotatably held by a bearing member 25 connected to the carriages 10 and 20 by a connecting member 24, and the rack 23 extending in the running direction of the carriages 10 and 20 is slightly away from the running track position of the carriages 10 and 20. It is attached to a guide member 27 that is fixed to the upper end of a plurality of columns 26 that are set apart from each other. A roller 28 that abuts on the back surface of the guide member 27 is rotatably attached to the connecting member 24, and the pinion 19 reliably meshes with the rack 23 when the roller 28 abuts against the guide member 27. For this reason, the carriages 10 and 20 travel by the rotation of the pinion 19 driven by the servo motor 14.
[0024]
The conveyance body 30 is shown in FIGS. 4 is a cross-sectional view taken along line S4-S4 of FIG. 3, and FIG. As shown in FIG. 3, horizontal beams 32 supported by a plurality of support columns 31 are constructed from area C to area D, and the horizontal beams 32 are arranged on both the left and right sides of the carrier 30 as shown in FIG. 4. ing. The conveyance body 30 has cross beams 30A extending to the horizontal beams 32, and the vertical beams 30B coupled to both ends of the cross beams 30A provided in the moving direction of the conveyance body 30 include: Rollers 35 and 36 sandwiching the guide rail 34 fixed to the upper surface of the horizontal beam 32 made of H-shaped steel from both the left and right sides, a roller 37 mounted on the upper surface of the guide rail 34, and the lower surface of the upper flange of the horizontal beam 32 An abutting roller 38 is rotatably attached. The conveyance body 30 can reciprocate between the area C and the area D while receiving the positioning action and the conveyance body weight support action by the rollers 35 to 38.
[0025]
A cylinder 39 is horizontally attached to the side surface of the horizontal beam 32 shown in FIG. 3, and a rack 41 is coupled to a piston rod 39 </ b> A of the cylinder 39 via a connecting member 40. The rack 41 extending in the moving direction of the transport body 30 is supported horizontally by a guide member 42 also shown in FIG. 4, and when the piston rod 39A of the cylinder 39 expands and contracts, the rack 41 also reciprocates horizontally. The rack 41 is engaged with a pinion 43 rotatably attached to the horizontal beam 32, and a pinion 45 is connected to the pinion 43 by a connecting shaft 44, and these pinions 44 and 45 rotate synchronously. The pinion 45 meshes with a rack 46 that is attached to the lower surface of the stringer 30 </ b> B of the transport body 30 so as to extend in the moving direction of the transport body 30. For this reason, the movement of the conveying body 30 along the horizontal beam 32 is performed by the rotation of the pinions 44 and 45 due to the expansion and contraction of the piston rod 39A of the cylinder 39.
[0026]
As shown in FIG. 5, the transport body 30 includes a downward-facing cylinder 49, and a large frame 50 is coupled to the piston rod 49 </ b> A of the cylinder 49, and the large frame 50 is expanded and contracted by the piston rod 49 </ b> A of the cylinder 49. Thus, the guide bar 51A moves up and down while being guided by the inserted guide member 51. Near the end of the large frame 50 on the area C side, a plurality of suction tools 52 are arranged in the moving direction of the carrier 30 and in the horizontal direction perpendicular to the moving direction. These suction tools 52 are vacuum suction tools, and suck and release the blanks W1 and W2 and the finished product Y by suction action by a suction device (not shown). Further, a downward cylinder 53 is attached to the end of the large frame 50 on the area D side, and a small frame 54 is coupled to the piston rod 53A of the cylinder 53. The small frame 54 moves up and down while being guided by the guide member 55 in which the guide bar 55A is inserted with respect to the large frame 50 by the expansion and contraction of the piston rod 53A. Also in this small frame 54, a plurality of suction tools 56 are arranged in the moving direction of the carrier 30 and in the horizontal direction perpendicular to the moving direction. These suction tools 56 are also vacuum suction tools.
[0027]
Each of the adsorbers 52 and 56 is provided at the lower end of a vertically movable rod 57 that is locked to the large frame 50 and the small frame 54 by a locking portion 57A at the upper end and whose lower limit is determined. A coil spring 58 is wound around 57.
[0028]
Therefore, when the piston rod 49A of the cylinder 49 is extended and the large frame 50 is lowered, the suction tools 52 and 56 are lowered and pressed against the blanks W1 and W2 and the finished product Y by the elastic force of the coil spring 58. As a result, the blanks W1 and W2 and the finished product Y are adsorbed by the adsorbing tools 52 and 56, and the rod 57 rises relative to the large frame 50 and the small frame 54, thereby reducing the amount of lowering of the piston rod 49A. The difference from the height positions of the blanks W1, W2 and the finished product Y is absorbed. Further, as will be described later, even if there is a large difference between the height position of the blanks W1 and W2 sucked by the suction tool 52 and the height position of the finished product Y sucked by the suction tool 56, the cylinder 53 This difference is also absorbed by the piston rod 53 </ b> A extending and the small frame 54 being lowered with respect to the large frame 50.
[0029]
There are two pillars 31 on the area D side shown in FIG. 3, the area B side and the area A side. The horizontal member 31 </ b> A installed between these pillars 31 has an arm 60 extending to the area B side. The base end portion is joined, and a rust preventive oil jet nozzle 61 is attached downward at the tip. As shown in FIG. 4, the nozzle 61 is arranged at the center position of the four suction tools 56 in the small frame 54 arranged in parallel in the horizontal direction perpendicular to the moving direction of the transport body 30. For this reason, the end portions of the blanks W1 and W2 are joined together by seam welding in the welding area A to produce a finished product Y, and the finished product Y is sucked by the suction tool 56 of the carrier 30 in the area B. When the finished product Y is transported to the area D by moving the cylinder 30 by the cylinder 39, the finished product Y can be sent to the area D while spraying the rust preventive oil ejected from the nozzle 61 to the seam welded portion of the finished product Y. It is like that.
[0030]
FIG. 7 is a plan view showing the two transfer tables 70 shown in FIG. These transfer bases 70 are reciprocally mounted on a guide rail 71. The guide rail 71 passes through the welding area A and extends horizontally continuously to the standby areas B provided on both sides of the welding area A. It is installed. Therefore, the guide rail 71 is common to the two transfer tables 70. Each transfer table 70 is connected to a piston rod 72A of a cylinder 72 attached to a guide rail 71. The transfer table 70 reciprocates on the guide rail 71 by the expansion and contraction of the piston rod 72A. The reciprocating range of one transfer table 70 is between one standby area B and the welding area A, and the reciprocating range of the other transfer table 70 is between the other standby area B and the welding area A. .
[0031]
The two transfer stands 70 have the same structure. That is, the outer shape of each transfer table 70 is formed by an outer frame 70A, and two plate-like jig members 73 and 74 for placing the blanks W1 and W2 are provided inside the outer frame 70A. These jig members 73 and 74 are horizontally supported by a support member 75. One jig member 74 does not move in its horizontal posture, but the other jig member 73 is rotatable upward about a hinge 76. A plurality of temporary clamping devices 80 for temporarily clamping the blanks W1 and W2 and a plurality of push devices 90 for pushing out the blanks W1 and W2 are arranged on the upper surfaces of the jig members 73 and 74, respectively. . The temporary clamping device 80 is shown in FIG. 13, and the push device 90 is shown in FIG.
[0032]
The temporary clamping device 80 of FIG. 13 is rotatable up and down around a cylinder 81, a fulcrum member 82 having a base end connected to the cylinder 81 and extending forward, and a fulcrum shaft 82A at the distal end of the fulcrum member 82. A claw member 83, a shaft 84 that rotatably connects the piston rod 81 </ b> A of the cylinder 81 and the claw member 83, and an attachment member 85 that is coupled to the fulcrum member 82. The temporary clamping device 80 is attached to the upper surfaces of the jig members 73 and 74 by coupling the attachment member 85 to the jig members 73 and 74 with bolts 86. Further, the claw member 83 rotates up and down around the fulcrum shaft 82A by the expansion and contraction of the piston rod 81A of the cylinder 81, and when the piston rod 81A is extended and operated, the claw member 83 moves the blanks W1 and W2 The clamp members 73 and 74 are pressed and temporarily clamped.
[0033]
14 includes a cylinder 91, a bracket 92 attached to the piston rod 91A of the cylinder 91, and a roller 93 attached to the bracket 92. The push device 90 is attached to the jig members 73 and 74 by coupling the cylinder 91 to the jig members 73 and 74 with bolts 94. Further, when the piston rod 91A of the cylinder 91 is extended and operated, the roller 93 pushes the end surfaces of the blanks W1 and W2, thereby pushing the blanks W1 and W2 forward.
[0034]
Moreover, as shown in FIG. 7, each transfer stand 70 is provided with a lap device 100 for stacking a predetermined amount of the end portions of the blanks W1, W2 to be seam-welded. The lap device 100 is attached to long support members 101 and 102 disposed below the jig members 73 and 74.
[0035]
FIG. 8 is a cross-sectional view taken along line S8-S8 of FIG. The lap device 100 is coupled to a first cylinder 104 mounted upward on a support member 101 with a bracket 103 and a tip of a piston rod 104A of the first cylinder 104, and a guide bar 105A is inserted by expansion and contraction of the piston rod 104A. A lifting member 106 that moves up and down while being guided by the guide member 105, a stop member 108 that is coupled to the tip of the lifting member 106 via a shim 107, and a lifting member that is located behind the stop member 108. 106, a push-up member 109 provided on 106, a second cylinder 111 attached upward to the support member 102 with a bracket 110, and a piston rod 111A of the second cylinder 111 are coupled to the tip of the piston rod 111A. Guy with guide bar 112A inserted An elevating member 113 which moves up and down while being guided by the members 112, made of the stop member 114. which is bolted to the front end of the lifting member 113. The stop members 108 and 114 that face each other are disposed directly below the gap 115 between the jig members 73 and 74.
[0036]
Note that, as shown in FIG. 8, of the two blanks W <b> 1 and W <b> 2, the blank W <b> 1 placed on the jig member 74 is a thick plate having a large thickness T <b> 1 and is placed on the jig member 73. The blank W2 is a thin plate having a small thickness T2.
[0037]
9-12 has shown the operation | work which overlaps the edge part W1A of the blank W1 and the edge part W2A of the blank W2 with the lapping apparatus 100 according to the order. After the blanks W1, W2 are placed on the upper surfaces of the jig members 73, 74 with a space therebetween, before these blanks W1, W2 are temporarily clamped by the temporary clamp device 80, first, as shown in FIG. When the piston rod 111A of the second cylinder 111 is extended and operated, the elevating member 113 rises and the stop member 114 protrudes from the gap 115 above the jig members 73 and 74 and the blanks W1 and W2. Next, as shown in FIG. 10, the blank W <b> 2 is pushed toward the blank W <b> 1 by the push device 90, so that the end W <b> 2 </ b> A hits the stop member 114. 11, as the piston rod 104A of the first cylinder 104 extends, the elevating member 106 is raised and the end of the jig member 73 is pushed up by the push-up member 109, whereby the jig member 73 is The stop member 108 pushes up the end W2A of the blank W2 while rotating slightly upward about the hinge 76 shown in FIG. Further, by the contraction operation of the piston rod 111 </ b> A of the second cylinder 111, the elevating member 113 and the stop member 114 are lowered, and the blank W <b> 1 is pushed toward the blank W <b> 2 by the push device 90, so that the end W <b> 1 </ b> A becomes the stop member 108. I hit it.
[0038]
Thereafter, as shown in FIG. 12, when the piston rod 104A of the first cylinder 104 is contracted, the elevating member 106, the stop member 108, and the push-up member 109 are lowered. As a result, the jig member 73 is moved back to the original position. While returning to the horizontal posture, the end W2A of the blank W2 rides on the end W1A of the blank W1, and the ends W1A and W2A overlap each other. Next, the blanks W1, W2 are temporarily clamped by the temporary clamp device 80 while maintaining this positional relationship.
[0039]
Note that the wrap amount (overlap width) between the end portions W1A and W2A of the blanks W1 and W2 is determined by the interval between the stop members 108 and 114. For this reason, as shown in FIG. 8, by preparing a plurality of shims 107 having different thicknesses interposed between the elevating member 106 and the stop member 108 and exchanging these shims, the end portions W1A, W2A are prepared. The amount of lap between each other can be arbitrarily set to an appropriate size for seam welding according to the thicknesses of the blanks W1 and W2.
[0040]
As shown in FIG. 7, the electrode roller riding member 120 is disposed on the upper surface of the jig member 74 that is stationary among the jig members 73 and 74. The electrode roller climbing member 120 is formed by attaching the upper electrode roller to the jig before seam welding the end portions W1A and W2A of the blanks W1 and W2 on which the upper and lower electrode rollers of the seam welding machine 130 are overlapped by the lapping apparatus 100. This is for climbing from the upper surface of the member 74 to a height position that is the same as or substantially the same as the total thickness of the end portions W1A and W2A. The electrode roller climbing member 120 is formed of a material having good electrical conductivity that does not cause seam welding due to heat generation even when energized between the upper and lower electrode rollers.
[0041]
15 is an enlarged view of the arrangement position of the electrode roller riding member 120 in FIG. 7, and FIG. 16 is a cross-sectional view taken along line S16-S16 in FIG. A planar L-shaped positioning member 121 is fixed to the end of the jig member 74 facing the gap 115 between the electrode member 73 and the electrode roller riding member 120 in a positioning state pressed against the positioning member 121. Are attached to the upper surface of the jig member 74 by bolts 122, and more than half of the electrode roller riding member 120 protrudes into the gap 115. When the electrode roller riding member 120 is consumed, it can be replaced with a new electrode roller riding member 120 by removing the bolt 122.
[0042]
The temporary clamping device 80, the push device 90, the lap device 100, and the electrode roller riding member 120 described above are arranged on the transfer table 70 shown in FIG. 7, and each of the two transfer tables 70 is a guide. A moving device 125 composed of a rail 71 and a cylinder 72 reciprocates horizontally between the welding area A and the standby area B.
[0043]
FIG. 17 is a side view of the seam welder 130, and FIG. 18 is a front view of the seam welder 130. In the welding area A, there are a base 131, pillars 132 erected at the four corners of the base 131, and two left and right horizontal beams 133 respectively installed between the upper ends of the two front and rear pillars 132. The constructed high strength frame structure 134 is installed. A guide rail 135 that guides the traveling of the seam welder 130 is disposed on the base 131, and a nut member 137 is attached to the traveling base 136 that is the base of the seam welder 130. Since the feed screw shaft 139 rotated by the servo motor 138 installed at the tip of the base 131 is screwed into the nut member 137, the seam welding machine 130 is rotated by the forward rotation and reverse rotation of the servo motor 138. It is guided by the guide rail 135 and moves forward and backward with respect to the welding area A.
[0044]
The seam welder 130 includes a lower bearing device 141 that is guided up and down by a guide member 140 provided on a traveling stand 136, a lower electrode roller 142 supported by the bearing device 141, and a bearing device 141. And an elevating device 143 for elevating and lowering the electrode roller 142. The carriage 136 is provided with an arm member 144 having a base end coupled to the rear end support 136 </ b> A of the carriage 136 and extending forward, and a downward cylinder 146 via a bracket 145 at the distal end of the arm member 144. Are combined. An upper bearing device 147 is attached to the piston rod 146A shown in FIG. 18 of the cylinder 146, and an upper electrode roller 148 that is vertically opposed to the lower electrode roller 142 is supported by the bearing device 147. Yes. As the piston rod 146A of the cylinder 146 expands and contracts, the bearing device 147 and the electrode roller 148 move up and down while being guided by a guide member 145A provided on the bracket 145.
[0045]
When the piston rod 146A of the cylinder 146 is extended and operated, the upper electrode roller 148 is pressed downward, whereby the upper and lower electrode rollers 142 and 148 pressurize the end portions W1A and W2A on which the blanks W1 and W2 are overlapped. Therefore, the cylinder 146 serves as a pressing means for pressing the upper electrode roller 148 downward during seam welding.
[0046]
In addition, as shown in FIG. 17, a power supply device 150 for supplying seam welding power to the upper and lower electrode rollers 142 and 148 by a flexible member 149 having an electric cable is mounted on the traveling stand 136. .
[0047]
As shown in FIG. 18, guide rails 151 extending in parallel with the guide rails 135 on the base 131 are attached to the respective horizontal beams 133 of the frame structure 134, and the guide rails 151 are connected to the guide rails 151. A guide member 152 provided on the bracket 145 is slidably engaged. Therefore, the seam welder 130 travels while being guided by the upper and lower guide rails 135 and 151, and the weights of the cylinder 146, the upper bearing device 147, and the upper electrode roller 148 are supported by the guide rail 151.
[0048]
The guide rail 71 that guides the transfer table 70 shown in FIG. 7 is supported by a column 160 that is erected in the standby area B on both sides of the welding area A as shown in FIG. For this reason, these guide rails 71 are arranged at a position higher than the floor 161 on which the base 131 of the frame structure 134 is installed. In addition, a cradle 162 attached to the base 131 is disposed inside the frame structure 134. As shown in FIG. 18, the cradle 162 is provided on the upper surface of each of the two cradles 162 provided on the left and right. A plate 163 is attached.
[0049]
A plurality of brackets 170 are suspended and fixed to each of the left and right horizontal beams 133 constituting the frame structure 134 at regular intervals in the length direction of the horizontal beams 133. A cylinder 171 for the clamp device is connected downward by a pin 172. The rear ends of the upper arm members 173 are connected to the piston rods 171A of the cylinders 171 by pins 174, and the intermediate portion in the longitudinal direction of the upper arm members 173 extending to the welding area A side is attached to the bracket 170 on the shaft 175. It is supported so that it can swing up and down. The lower arm member 176 is fixed to each receiving plate 163 at a position facing the upper arm member 173 in the vertical direction.
[0050]
When the transfer table 70 travels on the guide rail 71 and reaches the welding area A and stops, the piston rod 171A of the cylinder 171 contracts and the tip of the upper arm member 173 descends about the shaft 175. The blanks W1 and W2 placed on the jig members 73 and 74 of the transfer table 70 are clamped by the upper arm member 173 and the lower arm member 176 together with the jig members 73 and 74.
[0051]
For this reason, the cylinder 171, the upper arm member 173, and the lower arm member 176 constitute a main clamping device 180 for main clamping the blanks W <b> 1 and W <b> 2 in the transfer table 70. A plurality of the clamping devices 180 are arranged in the traveling direction of the seam welder 130 on both the left and right sides of the seam welder 130.
[0052]
Further, as shown in FIGS. 17 and 18, a cylinder 181 is attached to the frame structure 134 obliquely by a bracket 182, and a lap amount detection camera 183 is attached to the tip of a piston rod in which the cylinder 181 expands and contracts. ing. These cylinders 181 and cameras 183 are provided at two locations before and after the traveling direction of the seam welder 130 in the welding area A, as shown in FIG.
[0053]
FIG. 19 shows the operation of the two cameras 183 when the transfer table 70 reaches the welding area A from the standby area B. When the transfer table 70 moves to the welding area A and stops, the piston rods of the respective cylinders 181 extend and operate, so that the two cameras 183 are separated from the blanks W1 and W2 in the transfer table 70. It enters the gap 115 between the members 73 and 74 from an oblique direction. As a result, the two cameras 183 photograph the lap state at both ends of the seam welding machine 130 in the traveling direction of the linearly extending ends W1A and W2A of the blanks W1 and W2, and this image data. Is processed by an arithmetic device (not shown) to calculate the lap amounts L1 and L2, and the calculated data is sent to the control device to control the overall operation of the seam welding device.
[0054]
For this reason, the camera 183 serves as detection means for detecting the wrapping amounts L1 and L2 of the end portions W1A and W2A of the blanks W1 and W2 in the seam welding apparatus, and this detection means is applied to the blanks W1 and W2. Non-contact type without contact.
[0055]
As shown in FIGS. 17 and 18, the frame structure 134 in the welding area A has the above-described two blanks W <b> 1 and W <b> 2 placed on the transfer table 70 that has reached the welding area A and stopped. Protrusion forming means 190 for forming protrusions on the thin plate blank W2 is provided. The projection forming means 190 has an upper mold 192 attached to the piston rod of the downward cylinder 191. There are a plurality of cylinders 191 in the length direction of the horizontal beam 133 of the frame structure 134, and each cylinder 191 supports the above-described upper arm member 173 in the bracket 170 provided in the length direction of the horizontal beam 133. It is constructed between the supporting parts 170A. FIG. 23 shows the case where the upper mold 192 forms a projection W2B on the blank W2, and the lower mold 193 corresponding to the upper mold 192 is provided on the jig member 73 on which the blank W2 of the transfer table 70 is placed. When the transfer table 70 reaches the welding area A and stops, the lower mold 193 reaches a position directly below the upper mold 192, and the lower mold 193 has the receiving plate 163 shown in FIGS. It reaches directly above the backup member 194 attached to the upper surface of.
[0056]
When the piston rod of the cylinder 191 is extended and operated, as shown in FIG. 23, a projection W2B is formed on the blank W2 by the upper mold 192 and the lower mold 193 received by the backup member 194. Therefore, the projection forming means 190 is formed by the cylinder 191, the upper mold 192, the lower mold 193, and the backup member 194.
[0057]
As shown in FIGS. 2 and 7, two transfer tables 70 enter the welding area A from the standby areas B on the left and right sides of the welding area A alternately. Since the two blanks W1 and W2 are placed in a symmetrical position relationship, the protrusion forming means 190 for generating protrusions on the thin plate blank W2 has both left and right sides of the frame structure 134 as shown in FIG. Is provided.
[0058]
Next, the seam welding operation of the blanks W1 and W2 by the seam welding apparatus described above will be described. In addition, the servo motor 14 for the drive device 13 of the blank supply cart 10 and the finished product dispensing cart 20 shown in FIG. 6, the cylinder 39 for moving the carrier 30 shown in FIG. 3, the transfer shown in FIG. A cylinder 72 for moving the table 70, cylinders 104 and 111 of the lapping apparatus 100 shown in FIG. 8, and a seam welding apparatus such as a servomotor 138 for running the seam welder 130 shown in FIG. The drive source is operated based on a computer program, and thereby, the movable bodies such as the carriages 10 and 20, the conveyance body 30, and the transfer table 70 provided in the seam welding apparatus are activated at a predetermined timing. ing.
[0059]
Moreover, since the operation | movement of the moving body in the areas BH provided in the right and left both sides of the welding area A is the same, the following description is first performed about the areas BH of one side.
[0060]
When the blank supply carriage 10 of FIG. 3 stopped in the area E or F moves forward to the area C, the large frame 50 shown in FIG. 5 of the transport body 30 moving to the area C side is lowered. As a result, the suction tool 52 of the large frame 50 is attracted to the blanks W1 and W2 mounted on the carriage 10, and the blanks W1 and W2 are also lifted when the large frame 50 is lifted. Thereafter, the transport body 30 moves to the area D side, and when the blanks W1 and W2 sucked by the suction tool 52 reach the standby area B, the large frame 50 is lowered. As a result, the blanks W1, W2 are placed on the jig members 73, 74 of the transfer table 70 of FIG. 7 that has been retracted to the standby area B, and the suction of the suction tool 52 is released. Thereafter, the large frame 50 is raised, and the conveyance body 30 moves backward toward the area C side.
[0061]
When the blanks W1, W2 are placed on the jig members 73, 74 of the transfer table 70, the lap device 100 and the push device 90 provided on the transfer table 70 operate. Thereby, edge part W1A, W2A of blank W1, W2 is overlapped through the process of FIG.9, FIG.10, FIG.11, FIG. Thereafter, when the temporary clamping device 80 disposed on the transfer table 70 is activated, the blanks W1 and W2 are temporarily attached to the transfer table 70 while maintaining the positional relationship in which the end portions W1A and W2A are overlapped with each other. Clamped.
[0062]
Next, the transfer table 70 moves to the welding area A side and stops at the welding area A. Thereby, the blanks W1 and W2 are fed into the welding area A. Thereafter, the main clamping device 180 shown in FIGS. 17 and 18 attached to the frame structure 134 in the welding area A is operated, and the blanks W1 and W2 are finally clamped to the transfer table 70. Thereafter, the temporary clamp of the temporary clamp device 80 is released.
[0063]
The fact that the clamp device 180 fully clamps the blanks W1 and W2 means that the piston rod 171A of the cylinder 171 shown in FIG. 18 contracts and the tip of the upper arm member 173 descends about the shaft 175. At this time, a clamping reaction force is generated in the cylinder 171, and this clamping reaction force is supported by the frame structure 134 having a high strength.
[0064]
Thereafter, the piston rod of the cylinder 181 shown in FIG. 17 and FIG. 18 is operated to extend, whereby the respective lap amount detection cameras 183 are moved between the jig members 73 and 74 in the transfer table 10 as shown in FIG. The camera 183 detects the wrapping amounts L1 and L2 between the end portions W1A and W2A of the blanks W1 and W2, and then retracts due to the compression operation of the piston rod of the cylinder 181. When the lap amounts L1 and L2 detected by the camera 183 are values within a preset allowable error, the seam welding apparatus continues automatic operation, but the lap amounts L1 and L2 have an allowable error. If there is an error exceeding the limit, the clamp device 180 is released, the temporary clamp device 80 is re-clamped, and transferred by a signal from the control device receiving the lap amount data based on the image data from the camera 183. Returning from the welding area A of the table 70 to the standby area B is performed. In the standby area B, the operator manually changes the wrap amount between the end portions W1A and W2A of the blanks W1 and W2 to an appropriate value by releasing the temporary clamping device 80. After this operation, The blanks W1 and W2 are temporarily clamped by the temporary clamp device 80.
[0065]
Next, when the operator inputs a start signal to the control device, the transfer table 70 moves from the standby area B to the welding area A. In the welding area A, the main clamps of the blanks W1 and W2 by the main clamp device 180 are temporarily The temporary clamp of the clamping device 80 is released, and the lap amounts L1 and L2 are redetected by the lap amount detection camera 183.
[0066]
When the detected lap amount is within the allowable error, the seam welding apparatus resumes automatic operation, and when the first detected lap amount is within the allowable error, The seam welding apparatus continues automatic operation, whereby the seam welder 130 that has returned to the retreat limit starts traveling to the welding area A side. When the seam welder 130 travels to the welding area A side, the upper and lower electrode rollers 142 and 148 of the seam welder 130 that are spaced apart by the operation of the lifting device 143 and the cylinder 146 of FIG. After exceeding the outer frame 70A, these electrode rollers 142 and 148 are formed on the electrode roller riding member 120 protruding from the jig member 74 into the gap 115 between the jig members 73 and 74, as shown in FIG. The upper and lower surfaces are brought into contact with the lifting device 143 and the cylinder 146 by operation. When the upper electrode roller 148 rides on the climbing member 120 in this manner, the electrode roller 148 is pressed against the climbing member 120 by the cylinder 146 with a large force, and the mash between the upper and lower electrode rollers 142 and 148 is Energization for seam welding is started.
[0067]
The seam welder 130 travels as it is into the welding area A, whereby the upper and lower electrode rollers 142 and 148 are connected to the end portions W1A and W2A where the blanks W1 and W2 are overlapped as shown in FIG. , The end portions W1A and W2A are pressurized with a large pressing force of the cylinder 146, and mash seam welding is started. This mash seam welding does not start by directly riding on the end portions W1A and W2A on which the upper electrode roller 148 is overlapped, but as shown in FIG. 21, is equal to or substantially equal to the total thickness of the end portions W1A and W2A. The electrode roller 148 once rides on the electrode roller climbing member 120 having the same thickness, and then the upper and lower electrode rollers 142, 148 move to the end portions W1A, W2A, so that the end portions W1A, W2A Since pressurization is started, it is possible to prevent the edge portions (welding start ends of the end portions W1A and W2A) at the end portions W1A and W2A on the electrode roller riding member 120 side from being crushed and deformed.
[0068]
Such an electrode roller riding member is also provided at a position adjacent to the end of welding of the end portions W1A, W2A in the forward direction of the seam welder 130, and the seam welder 130 has finished welding the entire length of the end portions W1A, W2A. By causing the electrode roller 148 to also ride on the electrode roller riding member, it is possible to prevent the welding end of the end portions W1A and W2A from being crushed and deformed.
[0069]
As described above, the seam welding between the end portions W1A and W2A on which the blanks W1 and W2 are overlapped is performed by pressing the upper electrode roller 148 downward with the cylinder 146. An upward reaction force is generated as a reaction of pressing. The upward reaction force acts on the guide rail 151 via the bracket 145 and the guide member 152 shown in FIG. 18, and is received by the high-strength frame structure 134 to which the guide rail 151 is attached.
[0070]
When the seam welder 130 continuously travels within the welding area A, the entire lengths of the end portions W1A and W2A are mash seam welded, and thereby the finished product Y is completed by joining the blanks W1 and W2. When the electrode rollers 142 and 148 reach the end of the end portions W1A and W2A, the electrode rollers 142 and 148 move up and down from the end portions W1A and W2A by the operation of the lifting device 143 and the cylinder 146, and these electrode rollers 142 and 148 And the seam welder 130 is retracted to the original position.
[0071]
Thus, when the seam welder 130 is moving back to the retracted position, the projection forming means 190 provided on the left and right sides of the frame structure 134 shown in FIG. 18 corresponds to the thin plate blank W2. The piston rod of the cylinder 191 of the projection forming means 190 provided at the position extends and operates. As a result, as shown in FIG. 23, the upper mold 192 and the lower mold 193 form a protrusion W2B that protrudes downward and has a depressed upper surface on the thin plate blank W2, and then the piston rod contraction operation of the cylinder 191 The upper mold 192 is raised.
[0072]
The operation of forming the protrusion W2B on the blank W2 in this way is after the blanks W1 and W2 are joined and integrated by the seam welding machine 130 and when the blanks W1 and W2 are clamped by the clamp device 180. Therefore, the protrusion W2B is surely formed at the predetermined position of the blank W2, and the operation of forming the protrusion W2B is performed by effectively using the time for the seam welder 130 to return to the retracted position.
[0073]
Thereafter, the main clamping by the main clamping device 180 is released, and instead, the temporary clamping device 80 clamps the finished product Y to the jig members 73 and 74 of the transfer table 70. After the finished product Y is clamped by the temporary clamping device 80 in this way, the transfer stand 70 moves from the welding area A to the original standby area B, whereby the finished product Y is returned to the standby area B.
[0074]
When the end portions W1A and W2A of the blanks W1 and W2 are mash seam welded by the electrode rollers 142 and 148, the temporary clamping of the blanks W1 and W2 by the temporary clamping device 80 is kept, and after the mash seam welding is finished. Only the main clamping by the main clamping device 180 may be released, and thereby the finished product Y may be returned to the standby area B while being clamped to the transfer table 70 by the temporary clamping device 80.
[0075]
When the finished product Y reaches the standby area B, the large frame 50 of the transport body 30 in FIG. 5 is lowered, whereby the suction tool 52 of the large frame 50 is placed on the next blanks W1 and W2 on the carriage 10 in the area C. Further, the suction tool 56 of the small frame 54 provided in the large frame 50 is sucked to the finished product Y placed on the jig members 73 and 74 of the transfer table 70. At this time, when there is a large difference between the height position of the blanks W1 and W2 on the carriage 10 and the height position of the finished product Y on the transfer table 70, the small frame 54 is lowered with respect to the large frame 50. To absorb this difference. When the suction tool 56 sucks the finished product Y, the clamp of the temporary clamp device 80 is released. Next, the large frame 50 is raised, and when the small frame 54 is lowered, the small frame 54 is also raised, and then the carrier 30 moves to the area D side.
[0076]
As a result, the blanks W1 and W2 adsorbed by the adsorbing tool 52 are conveyed to the standby area B, and the finished product Y adsorbed by the adsorbing tool 56 is conveyed to the area D. W2 is placed on the jig members 73 and 74 of the transfer table 70, and the finished product Y is placed on the finished product dispensing carriage 20 reaching the area D, and the suction of the suction tools 52 and 56 is released. .
[0077]
Thus, when the transport body 30 is moved to the area D side in order to transport the finished product Y to the cart 20 in the area D, the finished product Y sucked by the suction tool 56 is shown in FIGS. The rust preventive oil ejected from the rust preventive oil jet nozzle 61 indicated by 4 is sprayed. This spraying position is a place where mash seam welding is performed, and thereby, rust preventive oil is applied to the seam welded portion of the finished product Y.
[0078]
Further, in the transfer table 70, the blanks W1 and W2 placed on the jig members 73 and 74 of the transfer table 70 are end portions W1A by the lapping device 100 and the push device 90 as in the case of the blanks W1 and W2. , W2A are overlapped and then temporarily clamped by the temporary clamp device 80. Next, the blanks W1 and W2 are fed into the welding area A by the movement of the transfer table 70, and after these blanks W1 and W2 are clamped by the clamping device 180, the wrap amount L1 between the end portions W1A and W2A is L1. L2 is detected by the camera 183. When these lap amounts L1 and L2 are within the allowable error, the seam welding apparatus continues the automatic operation, and when there is an error exceeding the allowable error, the lap amount changing work by the operator as described above. Then, the automatic operation is resumed, and the seam welder 130 performs mash seam welding on the end portions W1A and W2A of the blanks W1 and W2.
[0079]
For the finished product Y produced from the previous blanks W1 and W2, the projection W2B was formed on the thin plate blank W2 by the projection formation means 190 after the mash seam welding, but was produced from the current blanks W1 and W2. For the finished product Y, the operation of forming the protrusion W2B on the thin plate blank W2 by the protrusion forming means 190 is not performed.
[0080]
In the carrier 30, the large frame 50 rises, and then the carrier 30 returns to the area C side. Thus, the preparation for the suction tool 52 to suck the next blanks W1 and W2 mounted on the carriage 10 is produced from the blanks W1 and W2 in the welding area A and returned to the standby area B by the transfer table 70. Preparations for the suction tool 56 to suck the next finished product Y to be different will be completed.
[0081]
Then, the above operation is repeated, whereby the finished product Y is sequentially produced in the welding area A by the blanks W1 and W2 supplied from the carriage 10 in the area C, and the finished product Y is placed on the carriage 20 in the area D. .
[0082]
In the above, the operation of forming the projection W2B by the projection forming means 190 on the thin plate blank W2 of the finished product Y produced from the two blanks W1, W2 in the welding area A is performed every time a predetermined number of finished products Y are produced. , That is, This is performed every time two finished products Y are produced.
[0083]
FIG. 24 is an enlarged view of a portion of the protrusion W2B in the finished product Y that is stacked and placed on the carriage 20 in the area D. As shown in FIG. 8, there are differences in the thicknesses T1 and T2 of the two blanks W1 and W2, and as shown in FIG. 12, the end W2A of the thin plate blank W2 is above the end W1A of the thick plate blank W1. Even if these end portions W1A and W2A are mash seam welded by the seam welder 130, the thin plate blank W2 has the projection W2B, so the height level of each thin plate blank W2 is The height level of the thick plate blank W1 almost the same become. Further, the protrusions W2B are formed on the finished product Y every predetermined number of sheets, and the blank W2 on which the protrusions W2B are not formed is interposed between the blanks W2 on which the protrusions W2B are formed. Even if formed at the same position, the height level of the blank W2 is not lowered by the fitting of the upper and lower protrusions W2B protruding downward and having a depressed upper surface.
[0084]
When all the blanks W1, W2 disappear from the cart 10 in the area C, the cart 10 travels to one of the areas E and F, and another car with a large amount of blanks W1, W2 from the other area. A cart 10 is sent to area C. And the operation | work which loads new blank W1, W2 on the trolley | bogie 10 with which blank W1, W2 is lose | eliminated is performed. Further, when a predetermined number of finished products Y are placed on the cart 20 in the area D, the cart 20 travels to one of the areas G and H, and another cart that has nothing loaded from the other area. A carriage 20 is sent to area D. And the operation | work which unloads all the finished products Y from the trolley | bogie 20 with which the predetermined number of finished products Y is mounted is performed.
[0085]
In order to sequentially unload a large number of finished products Y loaded from the carriage 20, when the uppermost finished product Y is sucked and lowered by the suction means of the conveying means (not shown), the thick plate blank W1 and the thin plate blank are projected by the protrusion W2B. Since the height level of W2 is the same or substantially the same, this adsorption is surely performed.
[0086]
The operation for producing the finished product Y from the blanks W1, W2 performed as described above is performed in the areas B to H provided on the left and right sides of the welding area A.
[0087]
Specifically, among the standby areas B on both sides of the welding area A, blanks W1, W2 are fed from one standby area B to the welding area A by the transfer stand 70, and the blanks W1, W2 When the mash seam welding operation is performed in the welding area A, in the other standby area B, the end of the blank W1, W2 to be mash seam welded next in the welding area A in the other transfer stand 70 An operation of temporarily clamping these blanks W1 and W2 by overlapping W1A and W2A is performed. Then, when the mash seam welding operation in the welding area A is completed and the finished product Y produced thereby is returned to the original standby area B, the next blanks W1, W2 are transferred from the other standby area B to the transfer stand. 70 is fed into the welding area.
[0088]
When the mash seam welding operation of these blanks W1 and W2 is performed in the welding area A, the finished product Y sent to the original standby area B is transported to the carriage 20 in the area D by the transport body 30. The work and the work of transporting the blanks W1, W2 from the carriage 10 in the area C to the standby area B are performed, and these blanks W1, W2 are transferred to the end W1A in the transfer table 70 in the standby area B. , W2A are overlapped and then temporarily clamped.
[0089]
As described above, in the present embodiment, the blanks W1 and W2 are alternately fed from the two standby areas B provided on the left and right sides of the welding area A to the welding area A, whereby the finished product Y is sequentially produced. When the mash seam welding operation of the blanks W1 and W2 fed into the welding area A from one of the two standby areas B is being performed, For the blanks W1 and W2 to be seam welded, operations such as overlapping the end portions W1A and W2A necessary for performing the mash seam welding operation are performed.
[0090]
Then, blanks W1 and W2 are alternately sent from two standby areas B to the welding area A, and a predetermined number of finished products Y for each standby area B are produced by the blanks W1 and W2 sent from the respective standby areas B. Each time, the projection forming means 190 provided on the left and right sides of the frame structure 134 in FIG. 18 are alternately operated.
[0091]
According to the present embodiment described above, the protrusion forming means 190 is arranged in the welding area A, and the protrusion W2B is formed on the thin plate blank W2 of the two blanks W1 and W2 having different thicknesses by the protrusion forming means 190. Therefore, even if many of the finished products Y produced from these blanks W1 and W2 are loaded on the carriage 20 that moves between the area D and the areas G and H, the thick plate blanks in each finished product Y What is the height position of W1 and the thin plate blank W2? almost the same The whole of each finished product Y Almost horizontal It becomes. For this reason, the conveyance means provided with a plurality of suction tools at positions corresponding to the blanks W1 and W2 sequentially sucks and conveys the finished product Y from the uppermost finished product Y to a predetermined position for performing press working or the like. Can be performed as prescribed.
[0092]
Further, the formation of the protrusion W2B on the thin plate blank W2 by the protrusion forming means 190 means that the seam welder 130 moves to the retracted position after the seam welder 130 moves forward and the seam welding of the two blanks W1 and W2 is completed. Since it is performed during the returning movement, it is not necessary to provide a special time for forming the protrusion W2B during the entire seam welding operation time. For this reason, the whole work time is not lengthened, and the seam welding work can be performed efficiently.
[0093]
Further, when the projection W2B is formed on the thin plate blank W2, the finished product Y produced from the two blanks W1 and W2 is clamped by the clamping device 180, so that the finished product Y is surely placed at a predetermined position. The protrusion W2B can be formed on the surface.
[0094]
Further, the projection W2B is not formed on all the finished products Y produced from the two blanks W1 and W2, but each time a predetermined number of finished products Y are produced, the predetermined number of finished products Y is produced. Since the protrusion W2B is formed on the carriage 20, even when the protrusion W2B protrudes downward and the upper surface is recessed, when the finished product Y is stacked on the carriage 20, the finished product with the protrusion W2B is formed. A finished product Y on which no projection W2B is formed is interposed between Y. For this reason, it can be prevented that the upper and lower protrusions W2B are fitted and the height position of the thin plate blank W2 portion in the finished product Y is lowered.
[0095]
FIG. 22 shows an electrode roller riding member 220 according to another embodiment. The electrode roller riding member 220 does not have a constant thickness in the forward direction of the seam welder 130, and has a side sectional taper shape in which the thickness gradually increases in the forward direction. When such an electrode roller riding member 220 is used, before the upper and lower electrode rollers 142 and 148 of the seam welding machine 130 reach the position of the electrode roller riding member 220, the electrode rollers 142 and 148 are brought into contact with each other. I can leave. When these electrode rollers 142 and 148 reach the position of the electrode roller riding member 220, the electrode rollers 142 and 148 are separated from each other by the electrode roller riding member 220 in the same manner as in the case of the electrode roller riding member 120 of the above embodiment. Thus, the end portions W1A and W2A of the blanks W1 and W2 can be transferred.
[0096]
FIG. 25 shows an embodiment in which the sizes of blanks sent to the welding area A by the two transfer stands 70 from the standby areas B provided on the left and right sides of the welding area A are different. FIG. 26 shows an embodiment in which the shapes of the blanks sent from the standby area B to the welding area A by the two transfer stands 70 are different.
[0097]
These embodiments can be realized by making the arrangement positions of the temporary clamping device 80 and the push device 90 on the jig members 73 and 74 of the transfer table 70 freely changeable. In order to freely change the arrangement positions of the temporary clamping device 80 and the push device 90, a bolt 86 for fixing the cylinder 81 for the temporary clamping device 80 shown in FIG. 14 and the female screw hole for inserting the bolt 94 for fixing the cylinder 91 for the push device 90 shown in FIG. 14 to the jig members 73 and 74, the temporary clamp device 80 and the push device. The jig members 73 and 74 may be formed in the jig members 73 and 74 when the arrangement position of the 90 is changed. Alternatively, a large number of female screw holes into which the bolts 86 and 94 can be screwed are formed in the jig members 73 and 74 in advance. Also good.
[0098]
In the embodiment of FIG. 25, the sizes of the blanks W3 to W6 sent from the other standby area B to the welding area A are different from the blanks W1 and W2 sent from the one standby area B to the welding area A. . According to this, finished products having different sizes can be produced alternately in the welding area A.
[0099]
In the embodiment of FIG. 26, the shapes of the blanks W7 to W10 sent from the other standby area B to the welding area A are different from the blanks W1 and W2 sent from the one standby area B to the welding area A. According to this, finished products having different shapes can be alternately produced in the welding area A.
[0100]
In these embodiments, the sizes of the blanks W3 to W6 and W7 to W10 are sufficiently smaller than the blanks W1 and W2, so that they are placed on one transfer table 70 and seam welded by the seam welder 130. When a plurality of sets of blanks can be arranged in the traveling direction of the seam welder 130, a plurality of sets of blanks may be seam welded in one run of the seam welder 130. In this case, the electrode roller riding member 120 is provided for each set of blanks. Of course, the electrode roller riding member 220 in FIG. 21 may be used instead of the electrode roller riding member 120. In addition, when a plurality of sets of two blanks are arranged in the traveling direction of the seam welder 130 as described above, the electrode rollers 142 and 148 of the seam welder 130 are placed between the respective blank sets. Stop energization.
[0101]
25 and 26, two lap amount detection cameras 183 are alternately fed to the welding area A from the standby areas B on the left and right sides of the welding area A by the two transfer stands 70. Of the number of blank sets forming one set, the number corresponding to the larger number of sets is arranged in the welding area A. When a large number of blanks are sent to the welding area A on one transfer stand 70, all the cameras 183 are activated, and when a small set of blanks are sent to the welding area A on the other transfer stand 70. As many cameras 183 as the number corresponding to the number of sets are operated.
[0102]
FIG. 27 shows another embodiment of the detection position when the wrap amount detection camera 183 detects the wrap amounts of the end portions W1A and W2A of the blanks W1 and W2. In this embodiment, the camera 183 that moves forward by the extension operation of the piston rod of the cylinder attached to the frame structure 134 in the welding area A has an upper side and a lower side with respect to the blanks W1 and W2 fed into the welding area A. These two sets form a set, and a plurality of sets are provided in the traveling direction of the seam welder 130. The upper and lower cameras 183 in each set detect the lap amount L of the end portions W1A, W2A of the blanks W1, W2 at the positions where these cameras 183 have advanced.
[0103]
In each of the above embodiments, the blanks are not alternately sent from the standby areas B on the left and right sides of the welding area A to the welding areas A by the transfer table 70, but a certain number of blanks are transferred from one standby area B to the welding areas A. After feeding with the transfer table 70, a certain number of blanks may be sent with the transfer table 70 from the other standby area B to the welding area A. According to this, when producing finished products having different sizes and shapes from blanks having different sizes and shapes as in the embodiments of FIGS. 25 and 26, the same kind of finished products having the same size and shape are produced. It can be produced continuously and its management becomes easy.
[0104]
【The invention's effect】
According to the present invention, when the end portions of two blanks having different thicknesses are seam welded, and the finished products produced thereby are laminated, Almost horizontal The effect that it can be laminated is obtained.
[Brief description of the drawings]
FIG. 1 is a conceptual plan view showing arrangement positions of respective areas forming each part of a seam welding apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view of the entire seam welding apparatus having the respective areas shown in FIG.
FIG. 3 is a side view of the seam welding apparatus.
4 is a cross-sectional view taken along line S4-S4 of FIG.
5 is a side view of the transport body shown in FIG. 3. FIG.
6 is an enlarged view showing a driving device for the blank supply cart and the finished product dispensing cart shown in FIG. 3. FIG.
FIG. 7 is a plan view showing two transfer tables shown in FIG. 2;
8 is a cross-sectional view taken along line S8-S8 of FIG. 7 showing the lapping apparatus shown in FIG.
FIG. 9 is a diagram showing a first step of an operation of overlapping the ends of two blanks with a lapping device.
10 is a diagram showing a second step subsequent to FIG. 9. FIG.
11 is a diagram showing a third step subsequent to FIG. 10. FIG.
12 is a diagram showing a fourth step subsequent to FIG. 11. FIG.
FIG. 13 is a view showing the temporary clamping device shown in FIG. 7;
14 shows the push device shown in FIG.
15 is an enlarged plan view of the arrangement position of the electrode roller riding member in FIG. 7. FIG.
16 is a cross-sectional view taken along line S16-S16 in FIG.
FIG. 17 is a side view of a seam welder.
FIG. 18 is a front view of a seam welder.
FIG. 19 is a perspective view showing when a wrap amount detection camera detects a wrap amount of two blanks whose end portions overlap each other.
FIG. 20 is a front cross-sectional view showing a case where seam welding is performed on the overlapped end portions of blanks with upper and lower electrode rollers of a seam welding machine.
FIG. 21 is a side sectional view showing when the upper and lower electrode rollers of the seam welder are in contact with the electrode roller riding member.
FIG. 22 is a view similar to FIG. 20 showing an embodiment in which the electrode roller riding member has a tapered side cross section.
FIG. 23 is a longitudinal sectional view showing an operation for forming a protrusion on one of two blanks.
FIG. 24 is a longitudinal sectional view showing a case where finished products produced by seam welding of two blanks are stacked, and is an enlarged view showing a blank portion where protrusions are formed.
FIG. 25 is a view similar to FIG. 7 showing an embodiment in which blanks having different sizes are sent from a standby area provided on both sides of a welding area to the welding area.
26 is a view similar to FIG. 7 showing an embodiment in which blanks having different shapes are sent from a standby area provided on both sides of the welding area to the welding area. FIG.
FIG. 27 is a longitudinal sectional view showing an embodiment in which the lap amount of two blanks whose end portions are overlapped is detected by upper and lower lap amount detection cameras.
[Explanation of symbols]
70 Transfer stand
73, 74 Jig members for placing blanks
130 Seam Welding Machine
180 Clamping device
190 Protrusion forming means
191 cylinder
192 Upper mold
193 Lower mold
A Welding area
W1 thick blank
W2 thin plate blank
W1A, W2A end
W2B protrusion
Y finished product

Claims (4)

In a seam welding apparatus having a seam welder that can be moved forward and backward, and seam welds the overlapping ends of two blanks by this forward and backward movement.
Among the two blanks having different thicknesses, a lap device for stacking the end portions of these blanks with a blank with a large thickness on the bottom and a blank with a small thickness on the top,
Projection forming means for forming the projections on the blank having a small thickness among the two blanks , wherein the end portions of these blanks are arranged in an area where seam welding is performed by the seam welding machine,
A laminating apparatus for laminating a large number of finished products obtained by seam welding the two blanks,
The protrusion forming means places a thin blank with the protrusions on a blank with a small thickness where the protrusions are not formed in the finished product stacked by the stacking device. A seam welding apparatus that operates each time two finished products are produced from the blanks having different thicknesses by seam welding by the seam welding machine . In the seam welding apparatus according to claim 1, wherein forming the projection in the projection formation means, you characterized by being performed at the same position of each of the blank smaller thickness the protrusions are formed Seam welding equipment. In the seam welding method of seam welding the overlapped ends of two blanks with a seam welder that moves forward and backward,
Among the two blanks having different thicknesses, the step of stacking the ends of these blanks with the blank having a large thickness on the bottom and the blank with a small thickness on the top,
The seam welding is completed by the advanced seam welder, and the seam welder is moved to return to the retracted position to the blank having the small thickness among the two blanks clamped by the clamping device. forming a projection in the projection formation means when you are,
A step of laminating a large number of finished products obtained by seam welding the two blanks,
In the step of forming protrusions by the protrusion forming means, when a large number of the finished products are stacked in the step of stacking a large number of the finished products, the protrusions are formed on a thin blank having no protrusions. It is a process that is performed every time two finished products are produced from the blanks having different thicknesses by seam welding so that a thin blank with the protrusions formed thereon is placed. A characteristic seam welding method. 4. The seam welding method according to claim 3, wherein the step of forming the protrusion by the protrusion forming means is a step of forming the protrusion at the same position of each blank having a small thickness on which the protrusion is formed. A seam welding method characterized by comprising:

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