JP2023150254A - Manufacturing method of laminated core and manufacturing device of laminated core - Google Patents

Abstract

To provide a manufacturing method of a laminated core and a manufacturing device of the laminated core, capable of suppressing occurrence of arc discharge between a block core and a positioning member.SOLUTION: A manufacturing method for a laminated core is a method for manufacturing a laminated core including a laminated body formed by laminating a plurality of punched members, a plurality of through holes extending along a lamination direction of the laminated body, and a welding portion formed by welding at least a part of the laminated body in the lamination direction. The manufacturing method includes: arranging positioning members on the through holes of the laminated body; placing the laminate body on a lower side plate; placing an upper side plate above the laminated body; and welding the welding portion of the laminated body with a welding torch while the laminated body is sandwiched between the upper side plate and the lower side plate after the above steps. A concave groove is formed in the positioning member. The concave groove is located in a portion of the positioning member corresponding to a boundary between the laminated body and at least one of the upper side plate and the lower side plate.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a method for manufacturing a laminated core and an apparatus for manufacturing a laminated core.

Patent Document 1 discloses that a block core is obtained by laminating a plurality of plates punched from electromagnetic steel sheets, and a positioning member is inserted into a through hole provided in a lug part of the block core, and a plurality of block cores are stacked. This disclosure discloses a method for manufacturing a stator laminated core, which includes placing the block core on a jig and welding lug portions along the stacking direction of a plurality of block cores.

JP 2019-118169 Publication

When welding a plurality of block cores along the stacking direction, unintended arc discharge may occur in the gap between the block core and the positioning member. As a result, there is a concern that unintended regions of the block core and the positioning member may melt, which may affect the appearance and performance of the laminated core or affect the function of the positioning member.

Therefore, the present disclosure describes a laminated core manufacturing method and a laminated core manufacturing apparatus that can suppress the occurrence of arc discharge between the block core and the positioning member.

An example of a method for manufacturing a laminated core includes a laminated body formed by laminating a plurality of punched members, a plurality of through holes extending along the lamination direction of the laminated body, and at least a part of the laminated body in the lamination direction. A method for manufacturing a laminated iron core comprising: a welded portion formed by welding, the method comprising: arranging a positioning member in a through hole of the laminated body; placing the laminated body on a lower plate; and the steps of: After placing the upper plate above, arranging the positioning member, placing the laminate on the lower plate, and placing the upper plate above the laminate, the laminate is This includes welding the welded portion with a welding torch while the body is sandwiched between the lower plate and the upper plate. A groove is formed in the positioning member. The groove is located in a portion of the positioning member that corresponds to a boundary between the stacked body and at least one of the upper plate and the lower plate.

An example of a laminated iron core manufacturing apparatus includes a lower plate configured to be able to place a laminated body in which a plurality of punched members are laminated, and a through hole extending along the lamination direction of the laminated body. A positioning member configured to position the laminate relative to the lower plate, an upper plate configured to be placed above the laminate, and a laminate sandwiched between the lower plate and the upper plate. and a welding torch configured to weld a welded portion provided in the laminate in the state. A groove is formed in the positioning member. The groove is located in a portion of the positioning member that corresponds to a boundary between the stacked body and at least one of the upper plate and the lower plate. In this case, the same effects as the method of Example 1 can be obtained.

According to the laminated core manufacturing method and laminated core manufacturing apparatus according to the present disclosure, it is possible to suppress the occurrence of arc discharge between the block core and the positioning member.

FIG. 1 is a perspective view showing an example of a stator laminated core. FIG. 2 is an exploded perspective view of a laminate that constitutes the stator laminated core of FIG. 1. FIG. FIG. 3 is a schematic diagram showing an example of a laminated core manufacturing apparatus. FIG. 4 is a perspective view schematically showing an example of a welding jig. FIG. 5 is a cross-sectional view schematically showing an example of a welding device. FIG. 6 is a plan view schematically showing an example of a welding block. FIG. 7 is a cross-sectional view of a welding storage for explaining an example of a method for welding a laminate. FIG. 7(a) shows the state of the welding torch and arc at the start of welding, and FIG. 7(b) The state of the welding torch and arc during the process is shown. FIG. 8 is a cross-sectional view schematically showing another example of the welding device, in which FIG. 8(a) shows an example in which the number of block cores constituting the laminate is six, and FIG. An example is shown in which there are three block cores forming the body. FIG. 9 is a cross-sectional view schematically showing another example of a welding device, in which FIG. 9(a) shows an example in which six block cores constitute a laminate, and FIG. 9(b) shows a laminate with six block cores. An example is shown in which there are three block cores forming the body. FIG. 10 is a cross-sectional view schematically showing another example of the welding device. FIG. 11 is a sectional view schematically showing another example of the welding device.

In the following description, the same elements or elements having the same function will be denoted by the same reference numerals, and redundant description will be omitted. In this specification, when referring to the upper, lower, right, or left side of a figure, the direction of the symbol in the figure is used as a reference.

[Structure of stator laminated core]
First, the configuration of the stator laminated core 1 will be described with reference to FIGS. 1 and 2. Stator laminated core 1 is part of a stator. The stator is constructed by attaching windings (not shown) to a stator laminated core 1. An electric motor is configured by combining a stator and a rotor.

The stator laminated core 1 (stator) has a cylindrical shape as a whole. A through hole 1a (center hole) extending through the stator laminated core 1 is provided in the center portion of the stator laminated core 1 so as to extend along the central axis Ax. That is, the through hole 1 a extends in the height direction of the stator laminated core 1 . A rotor can be placed in the through hole 1a. The stator laminated core 1 constitutes an electric motor (motor) together with the rotor core. The stator laminated core 1 includes a laminated body 10 and a weld bead 20.

In the laminate 10, a plurality of block cores B (iron core members) are stacked in this order. In the example shown in FIGS. 1 and 2, the stacked body 10 is stacked such that six block cores B1 to B6 are arranged in this order from the top to the bottom. That is, the stacking direction of the laminate 10 is both the height direction of the laminate 10 and the extending direction of the central axis Ax. Below, the lamination direction of the laminate 10 will be simply referred to as the "lamination direction."

The block core B is a laminate in which a plurality of punched members W are stacked, as illustrated in FIG. 2 . The punching member W is a plate-like member obtained by punching a metal plate MS (for example, an electromagnetic steel plate) to a predetermined shape, and has a shape corresponding to the laminate 10. The block core B may be configured by so-called transposition.

"Rolling" refers to shifting the angles of the punched members W relative to each other when stacking a plurality of punched members W to obtain the block core B, and stacking the punched members W while rotating them. Including. Rolling is carried out mainly for the purpose of offsetting deviations in thickness of the punched member W. In obtaining the block core B, the punched members W may be rolled one by one, or the punched members W may be rolled one after another. When stacking a plurality of block cores B to obtain the laminate 10, the block cores B may be rolled one by one, or the block cores B may be rolled one by one.

Returning to FIG. 1, the laminate 10 includes a yoke portion 11, a plurality of teeth portions 12, a plurality of lug portions 13 (welded portions), and a plurality of caulked portions 14. The yoke portion 11 has an annular shape and extends so as to surround the central axis Ax. As illustrated in FIG. 1 and the like, the yoke portion 11 may have an annular shape. The plurality of teeth portions 12 extend along the radial direction of the yoke portion 11 from the inner edge of the yoke portion 11 toward the central axis Ax side. That is, the plurality of teeth portions 12 protrude from the inner edge of the yoke portion 11 toward the central axis Ax. The plurality of teeth portions 12 may be arranged at approximately equal intervals in the circumferential direction of the yoke portion 11. A slot 15 (through hole), which is a space for arranging a winding, is defined between adjacent teeth portions 12.

Each lug portion 13 extends from the outer edge of the yoke portion 11 along the radial direction of the yoke portion 11 so as to be away from the central axis Ax. That is, each lug portion 13 projects from the outer edge of the yoke portion 11 toward the outside in the radial direction of the yoke portion 11 . In the laminate 10 illustrated in FIG. 1, three lug parts 13 are integrally formed on the yoke part 11. The ear metal parts 13 may be arranged at approximately equal intervals in the circumferential direction of the yoke part 11. Each lug portion 13 extends linearly from one end surface (for example, the upper end surface) of the stacked body 10 to the other end surface (for example, the lower end surface) in the stacking direction.

The ear metal part 13 includes a main protrusion 13a and a sub-protrusion 13b (welded part). The main protrusion 13a is provided at the outer edge of the yoke portion 11, and may have a substantially triangular shape when viewed from above. The main protrusion 13a is provided with a through hole 16 that penetrates the main protrusion 13a (the ear metal part 13) in the stacking direction. The through holes 16 function, for example, as insertion holes for bolts for fixing the stator laminated core 1 to a housing (not shown) of a motor.

The caulking portion 14 may be provided on the yoke portion 11, for example. Although not shown, the caulking portion 14 may be provided on each tooth portion 12, for example. Adjacent punched members W in the stacking direction may be fastened together by caulking portions 14. The plurality of punched members W may be fastened together using various known methods instead of the caulking portion 14. The plurality of punched members W may be joined to each other using an adhesive or a resin material, for example. Alternatively, a temporary swage is provided on the punched member W, a plurality of punched members W are fastened together via the temporary swaged to obtain a temporary laminate, and then the temporary swage is removed from the temporary laminate to form a block core. You may get a B. Note that "temporary caulking" refers to caulking that is used to temporarily integrate a plurality of punched members W and is removed in the process of manufacturing a product (stator laminated core 1).

Weld bead 20 is formed on the outer surface of subprojection 13b. The weld bead 20 extends linearly from one end surface (for example, the upper end surface) to the other end surface (for example, the lower end surface) of the laminate 10 along the longitudinal direction of the subprojection 13b. The weld bead 20 joins a plurality of punched members W and a plurality of block cores B lined up in the stacking direction.

[Stator laminated core manufacturing equipment]
Next, with reference to FIG. 3, a stator laminated core manufacturing apparatus 100 (a laminated core manufacturing apparatus) will be described. The manufacturing apparatus 100 is configured to manufacture the stator laminated core 1 from a strip-shaped metal plate MS. The manufacturing apparatus 100 includes an uncoiler 110, a delivery device 120, a press processing device 130, a welding device 200, and a controller Ctr.

The uncoiler 110 is configured to rotatably hold the coil material 111. The coil material 111 is a metal plate MS wound into a coil shape (spiral shape). The sending device 120 includes a pair of rollers 121 and 122 that sandwich the metal plate MS from above and below. The pair of rollers 121 and 122 are configured to rotate and stop based on instruction signals from the controller Ctr, and to intermittently and sequentially feed the metal plate MS toward the press processing device 130.

The press processing device 130 is configured to operate based on instruction signals from the controller Ctr. The press processing device 130 may be configured to, for example, sequentially punch or cut and bend the metal plate MS sent out by the delivery device 120 using a plurality of punches to form a plurality of punched members W. . The press processing device 130 may be configured to form the block core B by sequentially stacking a plurality of punched members W obtained by punching. The block core B formed by the press processing device 130 may be transported to the welding device 200 by, for example, a conveyor Cv, or may be transported to the welding device 200 manually.

The welding device 200 operates based on an instruction signal from the controller Ctr, and is configured to weld the lug portion 13 (auxiliary protrusion 13b) of the stacked body 10 formed by stacking a plurality of block cores B. . Details of the welding device 200 will be described later.

The controller Ctr operates the delivery device 120, the press processing device 130, the welding device 200, and the conveyor Cv based on, for example, a program recorded on a recording medium (not shown) or an operation input from an operator. configured to generate a signal. The controller Ctr is configured to transmit the signals to the sending device 120, the press processing device 130, the welding device 200, and the conveyor Cv, respectively.

[Details of welding equipment]
Next, details of the welding apparatus 200 will be described with reference to FIGS. 4 to 6. The welding device 200 includes a lower plate 210, a plurality of guide shafts 220 (positioning members), a plurality of positioning pins 230 (positioning members), a plurality of guide rails 240, a diameter expander 250, and an upper plate 260. , a drive unit 270 (the above is also referred to as a "welding jig"), and a welding machine 280.

The lower plate 210 is a plate-like member having a substantially circular shape, as illustrated in FIG. 4 . The lower plate 210 is configured to support the stacked body 10 (a plurality of block cores B) placed on the upper surface of the lower plate 210. The upper surface side of the lower plate 210 is provided with a plurality of recesses 210a, as illustrated in FIGS. 4 and 5. The number and position of the plurality of recesses 210a may correspond to the number and position of the lug parts 13 of the laminate 10. Therefore, the plurality of recesses 210a may be arranged at approximately equal intervals so as to have a circular shape along the circumferential direction of the laminate 10.

A welding block 211 is arranged within the recess 210a. As illustrated in FIG. 6, the welding block 211 is provided with a pair of through holes 211a. The through hole 211a has a long hole shape extending along the radial direction of the lower plate 210 in plan view. Welding block 211 is attached within recess 210a of lower plate 210 by bolt BT inserted into through hole 211a. The position of welding block 211 with respect to lower plate 210 is adjusted depending on the position of bolt BT inserted with respect to through hole 211a.

The welding block 211 includes an uneven portion 211b corresponding to the sub-protrusion 13b in plan view. The uneven portion 211b has a pair of troughs 211c corresponding to the shape of the sub-protrusion 13b of the lug 13, and is provided at the center of the pair of troughs 211c and corresponds to the shape of the sub-protrusion 13b of the lug 13. 211d. The mountain portion 211d includes a facing surface S1 that faces the stacked body 10 in a state where the stacked body 10 is sandwiched between the lower plate 210 and the upper plate 260 (hereinafter simply referred to as the “snipped state”). As illustrated in FIG. 5, the facing surface S1 is inclined so as to expand outward in the radial direction of the stacked body 10 as it moves away from the stacked body 10 in the stacking direction. In other words, the facing surface S1 is configured such that a portion of the peak portion 211d on the upper surface side of the lower plate 210 is chamfered.

The plurality of guide shafts 220, the plurality of positioning pins 230, and the plurality of guide rails 240 are attached to the lower plate 210 so as to protrude upward from the upper surface of the lower plate 210. The plurality of guide shafts 220, the plurality of positioning pins 230, and the plurality of guide rails 240 may be fixed to the lower plate 210, or may be detachably attached to the lower plate 210.

The guide shaft 220 is configured to support the laminate 10 with respect to the lower plate 210 by being inserted into the through hole 16 of the lug portion 13 . Therefore, the guide shaft 220 does not necessarily have to be in contact with the through hole 16. The number and position of the plurality of guide shafts 220 may correspond to the number and position of the lug parts 13 of the stacked body 10. The plurality of guide shafts 220 may be arranged at approximately equal intervals so as to have a circular shape along the circumferential direction of the stacked body 10. The outer shape of the plurality of guide shafts 220 may be cylindrical, or may have a shape corresponding to the shape of the through hole 16.

A groove 221 is formed in the upper end of the guide shaft 220, as illustrated in FIG. The groove 221 may be provided over the entire circumference of the guide shaft 220, or may be provided so as to partially extend in the circumferential direction of the guide shaft 220. The position of the groove 221 in the guide shaft 220 corresponds to the boundary between the upper plate 260 and the stacked body 10 in the sandwiched state. Note that the position of the groove 221 may be set so that the center portion of the groove 221 in the stacking direction substantially coincides with the boundary.

Although not shown, the side walls of the groove 221 may be inclined such that the opening width of the groove 221 becomes smaller toward the bottom wall of the groove 221. In other words, the opening side edge of the groove 221 may be chamfered. The opening width of the groove 221 on the surface of the guide shaft 220 (the length of the groove 221 in the stacking direction) is not particularly limited, but may be, for example, about 3 mm to 8 mm.

The positioning pin 230 is inserted into the slot 15 and comes into contact with the inner circumferential surface of the slot 15, thereby positioning the stacked body 10 with respect to the lower plate 210. The number of the plurality of positioning pins 230 may be less than or equal to the number of slots 15. The positions of the plurality of positioning pins 230 may correspond to the slots 15. The plurality of positioning pins 230 may be arranged at approximately equal intervals so as to have a circular shape along the circumferential direction of the stacked body 10. The outer shape of the plurality of positioning pins 230 may be cylindrical, or may have a shape corresponding to the shape of the slot 15.

A groove 231 is formed in the upper end of the positioning pin 230, as illustrated in FIG. The groove 231 may be provided over the entire circumference of the positioning pin 230, or may be provided so as to partially extend in the circumferential direction of the positioning pin 230. The position of the groove 231 on the positioning pin 230 corresponds to the boundary between the upper plate 260 and the stacked body 10 in the sandwiched state. Note that the position of the groove 231 may be set so that the center portion of the groove 231 in the stacking direction substantially coincides with the boundary.

As illustrated in FIG. 5, the side walls of the groove 231 may be inclined such that the opening width of the groove 231 becomes smaller toward the bottom wall of the groove 231. In other words, the opening side edge of the groove 231 may be chamfered. The opening width of the groove 231 on the surface of the positioning pin 230 (the length of the groove 231 in the stacking direction) is not particularly limited, but may be, for example, about 3 mm to 8 mm.

The guide rail 240 is configured to slide a diameter expanding member 251, which will be described later, in the horizontal direction and along the direction in which the guide rail 240 extends. The number and position of the plurality of guide rails 240 may correspond to the number and position of the diameter expanding members 251. The plurality of guide rails 240 extend radially outward from the center of the lower plate 210. The plurality of guide rails 240 are arranged at approximately equal intervals so as to have a circular shape when viewed from above.

The diameter expanding tool 250 includes a plurality of diameter expanding members 251 (positioning members) and a pusher member 252, as illustrated in FIGS. 4 and 5. The plurality of diameter expanding members 251 are arranged at approximately equal intervals so as to have a circular shape when viewed from above. The diameter expanding member 251 has a fan shape when viewed from above. The diameter expanding member 251 can be obtained, for example, by dividing an annular columnar body into a plurality of parts. Both the upper and lower surfaces of the diameter expanding member 251 include an arc-shaped outer periphery, an arc-shaped inner periphery whose length is shorter than the outer periphery, and a linear side connecting one end of the outer periphery and one end of the inner periphery. and a linear side edge connecting the other end of the outer peripheral edge and the other end of the inner peripheral edge. The inner circumferential surface S2 of the diameter-expanding member 251 has an inclined surface that approaches the inside as it goes downward.

The diameter expanding member 251 is provided with a through hole 251a. The through hole 251a has a long hole shape extending between the inner circumferential surface S2 and the outer circumferential surface of the diameter expanding member 251. A corresponding guide rail 240 can be inserted into the through hole 251a. The length of the through hole 251a is longer than the length of the guide rail 240. Therefore, the diameter expanding member 251 is movable along the direction in which the guide rail 240 extends. Note that the through hole 251a may not be used as long as the guide rail 240 can be accommodated; for example, a recessed portion having an elongated opening may be provided in the diameter expanding member 251 instead of the through hole 251a.

A groove 251b is formed in the upper end of the diameter expanding member 251, as illustrated in FIG. The groove 251b may be provided so as to extend along the entire circumferential direction on the outer circumferential surface of the diameter-expanding member 251, or may be provided so as to partially extend along the circumferential direction on the outer circumferential surface of the diameter-expanding member 251. It may be. The position of the concave groove 251b in the diameter expanding member 251 corresponds to the boundary between the upper plate 260 and the stacked body 10 in the sandwiched state. Note that the position of the groove 251b may be set so that the center of the groove 251b in the stacking direction substantially coincides with the boundary.

Although not shown, the side walls of the groove 251b may be inclined such that the opening width of the groove 251b decreases toward the bottom wall of the groove 251b. In other words, the opening side edge of the groove 251b may be chamfered. The opening width of the groove 251b on the outer surface of the diameter expanding member 251 (the length of the groove 251b in the stacking direction) is not particularly limited, but may be, for example, about 3 mm to 8 mm.

The diameter expanding member 251 includes a corner portion 251c located on the outer surface side of the diameter expanding member 251 and extending along the stacking direction. The corner portion 251c may be entirely chamfered (for example, C-chamfered, R-chamfered, etc.), as illustrated in FIG. 4 . Alternatively, the corner portion 251c may be chamfered at a portion corresponding to the boundary between the upper plate 260 and the laminate 10 in the sandwiched state.

The pusher member 252 is arranged within the inner circumferential surface S2 of the diameter-expanding member 251, as illustrated in FIG. The pusher member 252 has a truncated conical shape whose diameter decreases toward the tip (lower end). Therefore, the outer circumferential surface of the pusher member 252 has a conical shape and has a shape corresponding to the inner circumferential surface S2 of the diameter-expanding member 251.

The upper plate 260 is a plate-like member having a substantially circular shape, as illustrated in FIG. 4 . The upper plate 260 is placed above the stacked body 10 placed on the lower plate 210. The upper plate 260 is provided with a through hole 261, a plurality of through holes 262, and a plurality of through holes 263, as illustrated in FIGS. 4 and 5.

The diameter expander 250 can be inserted through the through hole 261 . The through hole 261 has a circular shape and is located at the center of the upper plate 260. The through hole 261 may be approximately the same as or slightly larger than the inner diameter of the laminate 10.

The guide shaft 220 can be inserted through the through hole 262 . The number and position of the plurality of through holes 262 may correspond to the number and position of the guide shafts 220. Therefore, the plurality of through holes 262 may be arranged at approximately equal intervals so as to have a circular shape along the circumferential direction of the laminate 10. The through hole 262 may have the same or slightly larger outer diameter than the guide shaft 220.

The positioning pin 230 can be inserted through the through hole 263 . The number and position of the plurality of through holes 263 may correspond to the number and position of the positioning pins 230. Therefore, the plurality of through holes 263 may be arranged at approximately equal intervals so as to have a circular shape along the circumferential direction of the laminate 10. The through hole 263 may have the same or slightly larger outer diameter than the positioning pin 230.

The lower surface side of the upper plate 260 is provided with a plurality of recesses 260a. The number and position of the plurality of recesses 260a may correspond to the number and position of the lug parts 13 of the laminate 10. Therefore, the plurality of recesses 260a may be arranged at approximately equal intervals so as to have a circular shape along the circumferential direction of the stacked body 10.

A welding block 264 is arranged within the recess 260a. Welding block 264 has substantially the same configuration as welding block 211. Therefore, although the details are omitted, the welding block 264 includes a through hole 264a and an uneven portion 264b, as illustrated in FIG. The uneven portion 264b includes a valley portion 264c and a peak portion 264d. The mountain portion 264d includes a facing surface S3 that faces the stacked body 10 in the sandwiched state. As illustrated in FIG. 5, the facing surface S3 is inclined so as to expand outward in the radial direction of the stacked body 10 as it moves away from the stacked body 10 in the stacking direction. In other words, the facing surface S3 is configured by chamfering a portion of the peak portion 264d on the lower surface side of the upper plate 260.

The driving unit 270 is configured to move the upper plate 260 up and down to bring the upper plate 260 closer to or away from the lower plate 210. The drive unit 270 may be, for example, a linear motion mechanism such as an air cylinder, a hydraulic cylinder, or an electric cylinder.

The welding machine 280 is configured to weld the ear metal part 13 (auxiliary protrusion 13b). Welding machine 280 may be a welding machine using an arc welding method. The arc welding method may be, for example, a melting method in which an electrode is melted and used as a filler material, or a non-melting method in which a non-consumable electrode is used and a filler material is separately added. An example of a non-electrode type is TIG welding.

Welding machine 280 may include an anode member 281 electrically connected to the anode of the power source and a welding torch 282 electrically connected to the cathode of the power source, as illustrated in FIG. 5 . The anode member 281 may be connected to the lower plate 210, the upper plate 260, or each of the lower plate 210 and the upper plate 260 during welding.

The welding torch 282 is connected to a drive source (not shown) and is configured to be movable along the stacking direction from one of the lower plate 210 and the upper plate 260 toward the other. In a state where voltage is applied to the anode member 281 and the welding torch 282, welding jigs such as the laminate 10, the lower plate 210, the guide shaft 220, the positioning pin 230, the diameter expanding member 251, the upper plate 260, and the welding torch Since a potential difference is generated between the tip of the welding torch 282 (electrode rod), an arc is generated from the tip of the welding torch 282 toward the welding jig.

[Method for manufacturing stator laminated core]
Next, a method for manufacturing the stator laminated core 1 will be described with reference to FIGS. 3 to 7. First, as shown in FIG. 3, based on instructions from the controller Ctr, the press processing device 130 forms a block core B by stacking a plurality of punched members W while sequentially punching out a metal plate MS. Block core B discharged from press processing device 130 is conveyed to welding device 200 by conveyor Cv. At this time, a member in which the guide shaft 220 is attached to the lower plate 210 is configured as a conveying member CM (see FIG. 4), and with the plurality of block cores B placed on the conveying member CM, the conveying member CM is transferred to the conveyor. It may be transported to the welding device 200 by Cv. Note that a plurality of block cores B may be placed on the conveyance member CM while being rolled, and the laminate 10 may be formed on the conveyance member CM.

Next, with the stacked body 10 placed on the conveyance member CM, the plurality of positioning pins 230 are inserted into the corresponding slots 15 (see FIG. 5). Further, with the laminated body 10 placed on the conveyance member CM, the diameter expander 250 is placed in the center hole (corresponding to the through hole 1a of the stator laminated core 1) of the laminated body 10 (see the same). ). These orders may be one after the other, or may be at approximately the same time.

Next, the pusher member 252 of the diameter expander 250 is pushed downward. As a result, the pusher member 252 is pressed against each expanding diameter member 251 while the peripheral surface (conical surface) of the pushing member 252 remains in contact with the inner peripheral surface S2 of each expanding diameter member 251. Therefore, the circumferential surface (conical surface) of the pusher member 252 applies an outward force to the inner circumferential surface S2 while sliding on the inner circumferential surface S2. Therefore, each diameter expanding member 251 moves radially outward of the stacked body 10 while being guided by the guide rail 240. As a result, the outer circumferential surface of each diameter-expanding member 251 comes into contact with the inner circumferential surface of the center hole of the stacked body 10 (the tip surface of each tooth portion 12), and applies a radially outward force thereto.

Next, the upper plate 260 is placed on the stacked body 10. Specifically, the diameter expander 250 is inserted into the through holes 261 of the upper plate 260, the guide shafts 220 are inserted into each of the through holes 262 one by one, and the positioning pins 230 are inserted into each of the through holes 263 one by one. The upper plate 260 is lowered toward the stacked body 10 by the drive unit 270 so that the upper plate 260 is lowered. As a result, the laminate 10 is held between the lower plate 210 and the upper plate 260, and a predetermined load is applied to the laminate 10.

In this sandwiched state, the groove 221 in the guide shaft 220 is located at the boundary between the upper plate 260 and the stacked body 10. In this clamped state, the groove 231 in the positioning pin 230 is located at the boundary between the upper plate 260 and the stacked body 10, as illustrated in FIG. In this clamped state, the groove 251b in the diameter expanding member 251 is located at the boundary between the upper plate 260 and the laminate 10, as illustrated in FIG.

Next, the anode member 281 is connected to at least one of the lower plate 210 and the upper plate 260 (see FIG. 7). Next, the welding torch 282 is arranged so that the tip of the welding torch 282 faces, for example, the welding block 264 of the upper plate 260. In this case, the upper plate 260 becomes the welding start plate. In this state, by applying a voltage to the anode member 281 and the welding torch 282, an arc is generated from the tip of the welding torch 282 toward the welding block 264 (see FIG. 7(a)).

Next, the welding torch 282 is moved along the stacking direction toward the welding block 211 of the lower plate 210 while the arc is still generated. As a result, the sub-projection 13b is welded along the stacking direction, and a weld bead 20 is formed on the sub-projection 13b. Through the above steps, the stator laminated core 1, which is a laminate of a plurality of block cores B, is completed.

[Effect]
According to the above example, the grooves 221, 231, 251b are formed in the guide shaft 220, the positioning pin 230, and the expanding diameter member 251 (hereinafter collectively referred to as the "positioning member"). , 251b are located at the boundary between the upper plate 260 (welding start plate) and the laminate 10 in the sandwiched state. Therefore, since the distance between the positioning member and the stacked body 10 (block core B) is increased, arc discharge is less likely to occur between the positioning member and the stacked body 10 (block core B). Therefore, it is possible to suppress melting of unintended regions of the laminate 10 (block core B) and the positioning member.

According to the above example, chamfers can be formed on the opening side edges of the grooves 221, 231, and 251b. In this case, the opening side edges of the grooves 221, 231, and 251b are separated from the boundary between the upper plate 260 (welding start plate) and the stacked body 10 (block core B) in the sandwiched state. Therefore, arc discharge is less likely to occur between the positioning member and the laminate 10 (block core B).

According to the above example, the corner portion 251c of the diameter expanding member 251 may be chamfered. In this case, the corner portion 251c of the diameter-expanding member 251 is separated from the laminate 10 (block core B) by the chamfering process. Therefore, arc discharge is less likely to occur between the positioning member and the laminate 10 (block core B).

According to the above example, the opposing surfaces S1 and S3 are inclined surfaces. Therefore, at the start of arc discharge, the facing surface S3 of upper plate 260 (welding start plate) and welding torch 282 come close to each other, so that the start of arc discharge is stabilized. On the other hand, when the welding torch 282 moves in the stacking direction and the arc moves from the welding block 264 to the stacked body 10, the step between the facing surface S3 and the stacked body 10 is small or almost non-existent, so that The laminate 10 is welded without the arc jumping over the portion of the protrusion 13b near the upper end surface of the laminate 10. The same holds true near the end of welding the laminate 10, since the facing surface S1 of the lower plate 210 (welding end plate) and the welding torch 282 come close to each other, so the start of arc discharge is stabilized. On the other hand, when the welding torch 282 moves in the stacking direction and the arc moves from the stacked body 10 to the welding block 211, the step between the facing surface S1 and the stacked body 10 is small or almost non-existent, so that The laminate 10 is welded without the arc jumping over the portion of the protrusion 13b near the end face of the laminate 10. Therefore, it is possible to improve the quality of welding to the sub-protrusion 13b.

[Modified example]
The disclosure herein should be considered to be illustrative in all respects and not restrictive. Various omissions, substitutions, changes, etc. may be made to the above examples without departing from the scope and gist of the claims.

(1) The above technique may be applied when manufacturing a laminated core other than the stator laminated core 1. Other laminated cores may be, for example, rotor laminated cores.

(2) In the above example, the laminate 10 is configured by stacking a plurality of block cores B, but it may also be configured by a single laminate in which a plurality of punched members W are stacked. .

(3) A portion of the laminate 10 other than the lug portion 13 may be welded. For example, the outer circumferential surface of the laminate 10 may be welded, or the inner circumferential surface of the laminate 10 (the inner circumferential surface of the through hole 1a) may be welded. In these cases, grooves may be provided at the welding locations on the outer circumferential surface or inner circumferential surface of the laminate 10. The groove may extend, for example, along the stacking direction of the stacked body 10.

(4) In the above example, the weld bead 20 extends linearly from one end surface to the other end surface of the laminate 10 along the longitudinal direction of the sub-projection 13b, but the shape of the weld bead 20 is is not limited to this. For example, the weld bead 20 may partially extend in the stacking direction of the laminate 10 in the vicinity of the boundary so as to join each boundary between the block cores B. For example, the weld bead 20 may be formed by spot welding the boundaries between the block cores B so as to join the boundaries. For example, the weld bead 20 extends continuously from the uppermost boundary to the lowermost boundary among the boundaries between the block cores B so as to join all the boundary parts between the block cores B, and , it is not necessary to reach each end face of the laminate 10. Alternatively, weld bead 20 may be a combination of each of the above examples.

(5) The welding torch 282 may be moved from the welding block 211 of the lower plate 210 toward the welding block 264 of the upper plate 260 along the stacking direction. In this case, the grooves 221, 231, and 251b may be located at the boundary between the lower plate 210 (welding start plate) and the laminate 10 (block core B) in the sandwiched state.

(6) The shapes of the through holes 211a and 264a are not particularly limited as long as they are larger than the diameter of the bolt BT and smaller than the head of the bolt BT. In this case, the welding blocks 211, 264 are movable relative to the lower plate 210 or the upper plate 260 in a state where the welding blocks 211, 264 are not fixed to the lower plate 210 or the upper plate 260 by the bolts BT. Therefore, the positions of welding blocks 211 and 264 relative to lower plate 210 or upper plate 260 can be adjusted as appropriate. The shapes of the through holes 211a and 264a may be, for example, circular, elliptical, or rectangular instead of elongated.

(7) In the above example, the guide shaft 220, the positioning pin 230, and the expanding diameter member 251 were formed with the grooves 221, 231, and 251b, respectively, but at least one of these grooves may be formed with a groove. . Alternatively, a groove may be formed at the boundary between the welding start plate and the laminate 10 (block core B) in the sandwiched state with respect to another positioning member that positions the laminate 10 during welding of the laminate 10.

(8) In the above example, the diameter expander 250 was disposed in the center hole at the center of the laminate 10, but the diameter expander 250 may not be used. For example, a pillar member having an outer shape along the center hole of the laminate 10 may be placed in the center hole. The pillar member may be provided on the lower plate 210. Alternatively, no member may be placed in the central hole at the center of the laminate 10.

(9) As illustrated in FIGS. 8 and 9, a plurality of grooves may be formed in one positioning member. For example, when constructing one laminate 10 with six block cores B, as illustrated in FIGS. 8(a) and 9(a), the groove provided at the upper end of the positioning member is , will be located at the boundary between the upper plate 260 (welding start plate) and the laminate 10 in the sandwiched state. On the other hand, when configuring one laminate 10 by three block cores B, for example, as illustrated in FIGS. 8(b) and 9(b), a recess provided in the center of the positioning member The groove is located at the boundary between the upper plate 260 (welding start plate) and the laminate 10 in the sandwiched state. In this case, multiple types of laminates 10 can be welded using one positioning member. Therefore, it is possible to reduce the effort and cost of preparing multiple types of positioning members corresponding to different types of laminates 10 and replacing positioning members each time different types of laminates 10 are welded. .

As illustrated in FIG. 8, the heights of the six block cores B constituting one laminate 10 (see FIG. 8(a)) and the heights of the three block cores B constituting the other laminate 10 are (see FIG. 8(b)), the plurality of grooves formed in one positioning member are arranged at approximately equal intervals with respect to the surface of the lower plate 210. You can leave it there. On the other hand, as illustrated in FIG. 9, the heights of the six block cores B constituting one laminate 10 (see FIG. 9(a)) and the heights of the three block cores B constituting the other laminate 10 are (see FIG. 9(b)), the plurality of grooves formed in one positioning member are not arranged at approximately equal intervals with respect to the surface of the lower plate 210. Good too.

(10) As illustrated in FIG. 10, the groove formed in the positioning member may be located at the boundary between any two adjacent block cores B. In this case, unintended arc discharge is less likely to occur in a portion of the positioning member that corresponds to the boundary between two adjacent block cores B.

(11) The opposing surfaces S1 and S3 may have various shapes. For example, as illustrated in FIG. 11(a), a portion of the opposing surfaces S1, S3 that is close to the laminate 10 in the stacking direction extends linearly along the vertical direction, and A portion far from the stacked body 10 in the stacking direction may be an inclined surface. As illustrated in FIG. 11(b), the peaks 211d and 261d of the welding blocks 211 and 264 may be entirely inclined opposing surfaces S1 and S3. As illustrated in FIG. 11(c), a portion of the facing surfaces S1 and S3 that is close to the laminate 10 in the stacking direction extends linearly along the vertical direction, and a portion of the facing surfaces S1 and S3 that is close to the stacked body 10 in the stacking direction A portion far from the laminate 10 may have a step-like shape projecting outward in the radial direction of the laminate 10. The edges of these facing surfaces S1 and S3 on the side of the laminate 10 may be located closer to the central axis Ax than the outer peripheral surface of the laminate 10 in the radial direction of the laminate 10, or It may be located outward from the outer peripheral surface.

(12) As illustrated in FIG. 11(d), the opposing surfaces S1 and S3 may not be formed on the mountain portions 211d and 261d. Alternatively, opposing surfaces S1 and S3 may be formed on at least one of the mountain portions 211d and 261d.

[Other examples]
Example 1. An example of a method for manufacturing a laminated core includes a laminated body formed by laminating a plurality of punched members, a plurality of through holes extending along the lamination direction of the laminated body, and at least a part of the laminated body in the lamination direction. A method for manufacturing a laminated iron core comprising: a welded portion formed by welding, the method comprising: arranging a positioning member in a through hole of the laminated body; placing the laminated body on a lower plate; and the steps of: After placing the upper plate above, arranging the positioning member, placing the laminate on the lower plate, and placing the upper plate above the laminate, the laminate is This includes welding the welded portion with a welding torch while the body is sandwiched between the upper plate and the lower plate. A groove is formed in the positioning member. The groove is located in a portion of the positioning member that corresponds to a boundary between the stacked body and at least one of the upper plate and the lower plate.

By the way, when welding a welding part, unintended arc discharge may occur in the gap between the stacked body and the positioning member. In particular, immediately before arc discharge occurs, it is unstable where the current flows, so unintended arcs may occur in the part of the positioning member that corresponds to the boundary between at least one of the upper plate and the lower plate and the laminate. Discharge may occur.

However, according to Example 1, a groove is formed in the corresponding portion of the positioning member. Therefore, since the distance between the positioning member and the laminate is increased, arc discharge is less likely to occur between the positioning member and the laminate. Therefore, it is possible to suppress melting of unintended regions of the laminate or the positioning member.

Example 2. In the method of Example 1, another groove is formed in the positioning member, and the other groove is located at the boundary between at least one of the upper plate and the lower plate of the positioning member and another laminate. Located in corresponding parts, the height of the further stack may be different from the height of the stack. In this case, the presence of the groove and the other groove makes it difficult for arc discharge to occur between the positioning member and the laminate, both when welding the laminate and when welding another laminate. Therefore, multiple types of laminates can be welded using one positioning member. Therefore, it is possible to reduce the effort and cost of preparing multiple types of positioning members corresponding to different types of laminates and replacing the positioning members each time different types of laminates are welded.

Example 3. In the method of Example 1, the laminate is composed of a plurality of block cores stacked together, each of the plurality of block cores is composed of a plurality of punched members stacked together, and the positioning member has a separate A groove is formed, and another groove may be located in a portion of the positioning member corresponding to a boundary between any two adjacent block cores. In this case, unintended arc discharge is less likely to occur in a portion of the positioning member that corresponds to the boundary between two adjacent block cores.

Example 4. In any of the methods of Examples 1 to 3, the side walls of the groove may be inclined such that the opening width of the groove becomes smaller toward the bottom wall of the groove. In this case, the edge of the groove on the opening side is separated from the boundary between the welding start plate and the laminate. Therefore, arc discharge is less likely to occur between the positioning member and the laminate.

Example 5. In any of the methods of Examples 1 to 4, the through hole includes a center hole provided at the center of the laminate, and the positioning member is configured to be movable in the radial direction of the laminate and arranged around the periphery of the laminate. The positioning member includes a plurality of diameter-expanding members arranged in the center hole so as to be arranged in a circular manner along the The plurality of diameter-enlarging members are brought into contact with the inner circumferential surface of the center hole by moving outward, and each of the plurality of diameter-enlarging members is located on the outer surface side and in the stacking direction of the laminate. A chamfer may be formed in a portion of the corner corresponding to a boundary between at least one of the upper plate and the lower plate and the laminate. In this case, the corner of the diameter expanding member is separated from the boundary between the stacked body and at least one of the upper plate and the lower plate by the chamfering process. Therefore, arc discharge is less likely to occur between the positioning member and the laminate.

Example 6. In any of the methods of Examples 1 to 5, the welding portion extends along the stacking direction of the laminate, and welding the welding portion starts from a welding start plate that is one of the upper plate and the lower plate. The method may include welding a welded portion to the other of the upper plate and the lower plate using a welding torch along the stacking direction of the laminate.

Example 7. In the method of Example 6, the welding start plate includes an opposing surface that faces the welding part with the upper plate and the lower plate sandwiching the laminate, and the opposing surface has a diameter of the laminate increasing away from the laminate in the stacking direction. The layer is sloped so as to expand outward in the stacking direction, or has a step-like shape in which the portion farther from the layered layer protrudes outward in the radial direction of the layered layer than the portion closer to the layered layer in the stacking direction. It's okay.

By the way, in order to weld the entire length of the welding part along the stacking direction of the laminate, first, an arc discharge is generated between the welding start plate and the welding torch, and the welding torch is turned off while maintaining the arc state. is moved in the stacking direction. Therefore, when the welding start plate and the welding torch are close to each other, the start of arc discharge is stabilized. However, if the laminate and the welding torch are in close proximity, the amount of heat input to the laminate may increase and the laminate may melt excessively, or the electrode rod of the welding torch may wear out rapidly. may have to be replaced frequently. On the other hand, if the welding start plate is made to protrude further outward in the radial direction of the laminate than the laminate and a step is provided between the welding start plate and the laminate, the welding start plate and the welding torch will be brought close to each other. The initiation of arc discharge becomes stable. However, when the welding torch moves in the stacking direction and the arc crosses the step, there is a possibility that the arc will jump over a portion of the welding portion near the end face of the laminate, and that portion may not be welded.

On the other hand, according to Example 7, the facing surface of the welding start plate is inclined or has a stepped shape. Therefore, at the start of arc discharge, the welding start plate (opposed surface) and the welding torch come close to each other, so that the start of arc discharge is stabilized. On the other hand, when the welding torch moves in the stacking direction and the arc moves to the stack, the step between the opposing surface and the stack becomes small or almost non-existent, so Welding is carried out without the arc jumping over the area. Therefore, it is possible to improve the welding quality of the welded portion.

Example 8. An example of a laminated iron core manufacturing apparatus includes a lower plate configured to be able to place a laminated body in which a plurality of punched members are laminated, and a through hole extending along the lamination direction of the laminated body. A positioning member configured to position the laminate relative to the lower plate, an upper plate configured to be placed above the laminate, and a laminate sandwiched between the upper plate and the lower plate. and a welding torch configured to weld a welded portion provided in the laminate in the state. A groove is formed in the positioning member. The groove is located in a portion of the positioning member that corresponds to a boundary between the stacked body and at least one of the upper plate and the lower plate. In this case, the same effects as the method of Example 1 can be obtained.

DESCRIPTION OF SYMBOLS 1... Stator laminated core, 1a... Through hole (center hole), 10... Laminated body, 13... Lug part (welded part), 13b... Sub-projection part (welded part), 15... Slot (through hole), 16 ...Through hole, 100...Stator laminated core manufacturing device (laminated core manufacturing device), 200...Welding device, 210...Lower plate, 220...Guide shaft (positioning member), 221...Concave groove, 230...Positioning pin (positioning member), 231...concave groove, 250...diameter expander, 251b...concave groove, 251c...corner, 251...diameter expansion member (positioning member), 280...welding machine, 282...welding torch, B, B1~ B6...Block core, S1, S3...Opposing surface, W...Punching member.

Claims (8)

A laminate formed by stacking a plurality of punched members, a plurality of through holes extending along the stacking direction of the laminate, and a weld formed by welding at least a portion of the laminate in the stacking direction. A method of manufacturing a laminated iron core comprising:
arranging a positioning member in the through hole of the laminate;
placing the laminate on a lower plate;
placing an upper plate above the laminate;
After arranging the positioning member, placing the laminate on the lower plate, and placing the upper plate above the laminate, the laminate is placed between the upper plate and the laminate. Welding the welded part with a welding torch while being held between the lower plates,
A groove is formed in the positioning member,
The method for manufacturing a laminated iron core, wherein the groove is located in a portion of the positioning member corresponding to a boundary between at least one of the upper plate and the lower plate and the laminated body. Another groove is formed in the positioning member,
The other groove is located in a portion of the positioning member corresponding to a boundary between at least one of the upper plate and the lower plate and another laminate,
2. The method of claim 1, wherein the height of the other stack is different from the height of the stack. The laminate is configured by stacking a plurality of block cores,
Each of the plurality of block cores is configured by stacking the plurality of punched members,
Another groove is formed in the positioning member,
3. The method according to claim 1, wherein the another groove is located in a portion of the positioning member corresponding to a boundary between any two adjacent block cores. The method according to any one of claims 1 to 3, wherein the side walls of the groove are inclined so that the opening width of the groove becomes smaller toward the bottom wall of the groove. The through hole includes a center hole provided in the center of the laminate,
The positioning member is configured to be movable in the radial direction of the laminate and includes a plurality of diameter expanding members arranged in the center hole so as to be arranged in a circle along the circumferential direction of the laminate,
Arranging the positioning member includes arranging the plurality of diameter-expanding members within the center hole and moving the plurality of diameter-expanding members radially outward of the laminate. Including bringing it into contact with the peripheral surface,
Each of the plurality of diameter expanding members includes a corner portion located on the outer surface side thereof and extending along the lamination direction of the laminate,
5. The method according to claim 1, wherein a chamfer is formed at a portion of the corner corresponding to a boundary between at least one of the upper plate and the lower plate and the laminate. The welded portion extends along the lamination direction of the laminate,
Welding the welded portion includes welding the welded portion to the laminate with the welding torch from a welding start plate that is one of the upper plate and the lower plate toward the other of the upper plate and the lower plate. The method according to any one of claims 1 to 5, wherein the welding is performed along the lamination direction. The welding start plate includes an opposing surface that faces the welding part with the upper plate and the lower plate sandwiching the laminate,
The opposing surface is inclined so as to expand outward in the radial direction of the laminate as it moves away from the laminate in the stacking direction, or the facing surface is inclined to expand outward in the radial direction of the laminate as it moves away from the laminate in the stacking direction, or 7. The method according to claim 6, wherein a portion remote from the laminate has a stepped shape projecting outward in the radial direction of the laminate. a lower plate configured to be able to place a laminate in which a plurality of punched members are stacked;
a positioning member configured to position the laminate relative to the lower plate by being disposed in a through hole extending along the stacking direction of the laminate;
an upper plate configured to be placed above the laminate;
a welding torch configured to weld a welded portion provided on the laminate while the laminate is sandwiched between the upper plate and the lower plate;
A groove is formed in the positioning member,
The apparatus for manufacturing a laminated iron core, wherein the groove is located in a portion of the positioning member corresponding to a boundary between at least one of the upper plate and the lower plate and the laminated body.

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