JP2008092650A - Manufacturing method of rotor core, and rotor core manufactured by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a rotor core capable of further efficiently stacking a plurality of divided core plates and coupling them in disposing the divided core plates to form them in a circular shape, and stacking and coupling the formed core plates, and to provide the rotor core manufactured by this method. <P>SOLUTION: The rotor core 10 has a configuration in which a first core plate 14 and a second core plate 18 forming each of layers are coupled in a stacking direction via fixing pins 22 in a state that first divided core plates 12 and second divided core plates 16 are circularly disposed and stacked. Between the layers adjacent to each other, the divided core plates 12, 16 are alternately stacked so that their ends can be shifted at predetermined distances. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotor core manufacturing method in which a plurality of divided core plates are arranged in the circumferential direction to form an annular shape, and these are stacked and bonded together, and a rotor core manufactured by the manufacturing method.

  For example, the rotor core of an electric motor is formed in a cylindrical shape by laminating thin steel plates formed in an annular shape. For this reason, each thin steel plate is cut out from the plate member in an annular shape, and its inner peripheral portion is not utilized.

  Therefore, in order to improve the utilization factor of the plate member, there is known a rotor core constituted by a divided core plate made of a plurality of fan-shaped thin steel plates divided in the circumferential direction.

  In such a rotor core, the present applicant has proposed that a split core plate provided with a convex portion on the inner peripheral side is laminated, and a boss portion fixed to the convex portion is formed by casting (Patent Document). 1). Thereby, the utilization factor of the plate member is improved, and the divided core plates are firmly coupled by the cast boss portion.

Japanese Patent Laying-Open No. 2005-210790

  By the way, in the method described in Patent Document 1, it is necessary to cast a member for forming the boss portion on the inner peripheral side after laminating the divided core plates, and the number of manufacturing processes of the rotor core tends to increase. . For this reason, a method of laminating and joining the divided core plates more efficiently has been desired.

  The present invention has been made in consideration of the above-mentioned problems. When a plurality of divided core plates are arranged in the circumferential direction to form an annular shape, and when these are laminated and joined, It is an object of the present invention to provide a method for manufacturing a rotor core capable of performing lamination and bonding thereof more efficiently, and a rotor core manufactured by the manufacturing method.

  The method for manufacturing a rotor core according to the present invention is a method for manufacturing a rotor core to be bonded after arranging and laminating a plurality of divided core plates in an annular shape, and after stamping and forming a connecting portion provided on the divided core plate A first step of returning the punched portion to the punched portion of the split core plate; and after the first step, a plurality of split core plates are arranged in an annular shape, and the connecting portions of the layers are continuous in the axial direction. A second step of laminating the layers, and after the second step, a coupling member is inserted into the coupling portion of each of the laminated core plates stacked to eject the punched portion, and the layers are coupled. And 3 steps.

  According to such a method, after punching and forming the joint portion, the layers can be joined by the joint member while continuously discharging the punched portion returned to the split core plate by the joint member. . For this reason, it is possible to join the split core plates constituting each layer extremely easily and quickly, and the manufacturing efficiency of the rotor core is improved.

  In this case, in order to make the adhesive force of the adhesive effective for the laminated body in which each layer is bonded by the connecting member after the third step, the divided core plate is preliminarily coated with an adhesive. When the fourth step of performing the heat treatment and the cooling treatment is provided, the layers can be more firmly bonded by the bonding member and the adhesive. For this reason, a very high-strength rotor core can be manufactured.

  Further, in the second step, when the end portions of the divided core plates between the overlapping layers are alternately stacked in a state of being shifted from each other by a predetermined distance, the layers are bonded to each other so that the coupling strength of the rotor core is increased. Can do.

  Furthermore, each of the divided core plates is provided with a plurality of the connecting portions, and the connecting portion of each of the divided core plates arranged in the lowermost layer in the second step is a through hole, and other than the lowermost layer. In the second step, each of the divided core plates to be arranged is a positioning portion in which a concave portion is formed on the upper surface side and a convex portion protruding downward is formed on the lower surface side. By locking the protrusions of the upper divided core plates by the through holes or the recesses of the upper layer, the layers are stacked while being positioned, thereby effectively suppressing the stacking misalignment when the coupling member is inserted. And the coupling member can be inserted more accurately and quickly.

  Furthermore, in the third step, after the coupling member is fitted into a part of the coupling parts of the divided core plates constituting the same layer, the coupling member is inserted into the remaining coupling parts. By inserting the insertion member, the coupling member is inserted and inserted while maintaining the state in which the through hole or the concave portion and the convex portion are always locked and positioned in each layer. For this reason, it becomes possible to suppress the lamination | stacking shift | offset | difference at the time of insertion of a coupling member more reliably.

  Further, the rotor core of the present invention is a rotor core in which a plurality of divided core plates are arranged in an annular shape and laminated in a laminated state, and the end portions of the divided core plates are separated from each other by a predetermined distance between the overlapping layers. The layers are alternately stacked in a shifted state, and the layers are connected by connecting members inserted along the stacking direction.

  According to such a configuration, the end portions of the respective divided core plates are alternately stacked with a predetermined distance shifted from each other, and the layers are coupled by the coupling member. There is provided a rotor core that can be manufactured at a lower cost than the above-described conventional method in which the boss portion is cast.

  Further, when the layers are bonded by an adhesive, the bonding strength of the rotor core according to the present invention can be further increased.

  According to the method for manufacturing a rotor core of the present invention, after punching and forming the joint portion, the layers are joined by the joint member while the punched portion returned to the divided core plate is continuously discharged by the joint member. For this reason, it is possible to join the divided core plates constituting each layer very easily and quickly, and to improve the manufacturing efficiency of the rotor core.

  Further, according to the rotor core of the present invention, the ends of the divided core plates are alternately stacked in a state where they are shifted from each other by a predetermined distance, and the layers are coupled by the coupling member. For this reason, the rotor core which can be manufactured at low cost and has sufficient strength is provided.

  Hereinafter, a preferred embodiment of a method for producing a rotor core according to the present invention will be described in detail in relation to a rotor core produced by the production method, with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a rotor core 10 manufactured by the method for manufacturing a rotor core according to the first embodiment of the present invention. The rotor core 10 according to the present embodiment constitutes an electric motor together with a stator (stator) (not shown) or the like as one part constituting the rotor (rotor).

  The rotor core 10 includes a first core plate 14 in which a plurality of (in the present embodiment, three) first divided core plates 12 made of fan-shaped thin steel plates are arranged in the circumferential direction and formed in an annular shape, and a fan-shaped thin steel plate. The second divided core plate 16 is composed of a second core plate 18 formed in an annular shape by arranging a plurality of (three in the present embodiment) circumferentially with a phase shifted from the first core plate 14. On the first core plate 14 that forms the lowermost layer, a plurality (49 in the present embodiment) of the second core plates 18 are laminated in layers to form a total of 50 layers. Then, six pin holes (coupling members, through holes) 20 provided in each layer (two in each divided core plate) and fixing pins (coupling members) 22 are arranged in the stacking direction (axial direction) of the rotor core 10. It is inserted along, and each layer is firmly joined. Note that the number of laminated rotor cores 10 may be appropriately changed according to the use conditions and the like.

  In such a rotor core 10, between the overlapping layers, that is, between the odd layers (the first layer, the third layer, etc.) and the even layers (the second layer, the fourth layer, etc.), the divided cores constituting each layer as described above. The position of the end portion where the plates abut is shifted by a predetermined distance (predetermined angle). The end portions in the odd-numbered layers are arranged at a total of three locations in increments of 120 ° with reference to the position indicated by A1 in FIG. The end portions of the even layer are arranged at a total of three positions in increments of 120 ° with reference to the position indicated by A2 in FIG. 1, that is, the position shifted by 60 ° from the A1.

  Specifically, as shown in FIG. 2, for example, in the first core plate 14 constituting the first layer (lowermost layer) which is an odd layer, the position A1 of the end portion where the first divided core plates 12 abut each other. Are arranged at a total of three locations in increments of a predetermined angle θ1 (120 ° in this embodiment). On the other hand, in the second core plate 18 constituting the second layer which is an even layer, the position A2 of the end where the second divided core plates 16 abut each other is at a predetermined angle θ2 (60 ° in this embodiment) from the position A1. ) The positions are shifted, and are arranged at a total of three locations in increments of a predetermined angle θ3 (120 ° in this embodiment).

  As shown in FIG. 2, the first divided core plate 12 is formed with a pair of substantially semicircular protrusions 24, 24 at the arcuate edge on the inner periphery side, and each protrusion 24 is a first part. It arrange | positions at equal intervals in the 1st core plate 14 in which the three division | segmentation core plates 12 are arrange | positioned. A positioning convex portion (coupling portion, positioning portion) 26 of the second divided core plate 16 is locked to the substantially central portion of the projecting portion 24 (see FIGS. 16A and 16B), and the fixing pin 22 is inserted. A pin hole 20 is formed.

  Further, the first divided core plate 12 is formed with four rectangular magnet holes 28 at substantially equal intervals along an arcuate edge on the outer peripheral side thereof. When the first core plate 14 and the second core plate 18 are laminated in layers (see FIG. 1), a magnet (not shown) is fitted into the magnet hole 28.

  The second divided core plate 16 has a pair of substantially semicircular protrusions 29 and 29 formed on the arcuate edge on the inner peripheral side thereof, and each protrusion 29 has three second divided core plates 16 arranged therein. The second core plates 18 are arranged at equal intervals. A substantially conical positioning convex part 26 projecting downward is formed at a substantially central part of the projecting part 29 (see FIGS. 16A and 16B).

  Further, like the first divided core plate 12, four rectangular magnet holes 28 are formed in the second divided core plate 16 at substantially equal intervals along the arcuate edge on the outer peripheral side. Has been.

  The positioning convex portion 26 includes a convex portion 26a that is formed on the lower surface side of the second divided core plate 16 and protrudes downward, and a concave portion 26b that is formed on the upper surface side by the inner wall surface of the convex portion 26a. (See FIGS. 16A and 16B). Thereby, each positioning convex part 26 laminates | stacks each layer by the said convex part 26a being latched by each pin hole 20 of the lower 1st core plate 14, or each recessed part 26b of the 2nd core plate 18. FIG. It functions as a positioning part when doing.

  In addition, after each layer is positioned and laminated | stacked, the positioning convex part 26 is discharged | emitted with the peripheral part by the fixing pin insertion apparatus 70 mentioned later, and functions as the pin hole 20 in which the fixing pin 22 is inserted.

  The second divided core plate 16 is formed to have substantially the same outer shape as the first divided core plate 12, and when three plates are arranged at a predetermined angle θ3 (120 ° in this embodiment), An annular second core plate 18 having substantially the same outer shape as the first core plate 14 is formed.

  Next, an example of a manufacturing method for manufacturing the rotor core 10 configured as described above will be described with reference to the drawings.

  FIG. 3 is a schematic plan view showing the configuration of the rotor core production line 30 used in the method for producing the rotor core 10 according to the first embodiment.

  The rotor core production line 30 includes a first molding device 30a and a second molding device 30b arranged in parallel with the first molding device 30a. In the rotor core production line 30, the belt-shaped plate member 32 straddling the first molding device 30a and the second molding device 30b is conveyed by one pitch in the arrow X direction (each arrow P1 in FIG. 3). Then, the first divided core plate 12 and the second divided core plate 16 are continuously formed in parallel from the plate member 32 by the first forming device 30a and the second forming device 30b, and two pieces are laminated respectively. The rotor core 10 is manufactured in parallel.

  The first molding device 30a includes a pilot hole molding die 34, a pin hole molding die 36, and a positioning convex portion molding die from the upstream side where the plate member 32 is conveyed toward the downstream side (arrow X direction). A die 38, an outer shape extraction / return die 40, a magnet hole forming die 42, a pin hole extraction / return die 44, and a dropout die 46 are provided.

  The second molding device 30b has substantially the same configuration as the first molding device 30a, and the pilot hole molding die 34, the pin hole molding die 36, and the positioning convex molding die 38 are the same as those of the first molding device 30a. It is configured integrally with them. Then, on the downstream side slightly spaced from the positioning convex mold 38, an outer shape extraction mold 40, a magnet hole molding mold 42, a pin hole extraction mold 44 and a drop-off mold 46 are sequentially provided. Yes. In the second molding apparatus 30b, the pin hole molding die 36, the positioning convex portion molding die 38, the outer shape extraction return die 40, the magnet hole molding die 42, the pin hole extraction return die 44 and the dropout die 46. Are symmetrically configured in a direction (width direction of the plate member 32) perpendicular to the conveying direction (arrow X direction) of the plate member 32, as compared with those of the first molding device 30a.

  FIG. 4 is a partially omitted plan view for explaining the first step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30. In this manufacturing method, each step is performed every time the plate member 32 is conveyed by 1 pitch, and a symbol Op is shown in the drawing for a mold operated in each step. When a plurality of molds are operated simultaneously in a single process, the symbol Op is written on all the molds that are operated.

  As shown in FIG. 4, first, in the first step, a pilot hole 47 is formed in the pilot hole forming die 34 of the first molding apparatus 30a and the second molding apparatus 30b with respect to the plate member 32 conveyed by a conveying means (not shown). , 47 and 48, 48 are opened. These pilot holes 47 and 48 are engaged with pilot pins (not shown) provided on each mold and the rotor core manufacturing line 30 for each process, and serve to position the plate member 32 at a predetermined position. The pilot hole 47 is mainly used in the first molding apparatus 30a, and the pilot hole 48 is mainly used in the second molding apparatus 30b.

  In the rotor core production line 30, the pilot hole forming die 34 is operated once every two processes, that is, in odd-numbered processes. However, the present invention is not limited to this. For example, the pilot hole forming mold 34 is set to operate in all processes. May be.

  After opening the pilot holes 47 and 48 in the first step, the plate member 32 is transported by 2 pitches (in the direction of arrow X), and the pilot holes 47 and 48 are engaged with the pilot pins to position the plate member 32. . In addition, since the positioning operation by the pilot holes 47 and 48 and the pilot pin is usually performed in the same manner in each process, the description thereof will be omitted below.

  FIG. 5 is a partially omitted plan view for explaining a third step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30.

  In the third step, new pilot holes 47 and 48 are formed by the pilot hole forming die 34 at a position 2 pitches (upstream side) behind the pilot holes 47 and 48 opened in the first step. At the same time, the pin hole 20 to be provided in the first divided core plate 12 of the first sheet in each of the molding devices 30a and 30b is opened by the pin hole molding die 36 of the first molding device 30a and the second molding device 30b. .

  After the third step, the plate member 32 is conveyed by 1 pitch. Next, the pin hole molding die 36 is operated in the same manner as in the third step, and the second first sheet in each molding device 30a, 30b is located one pitch behind the pin hole 20 opened in the third step. A pin hole 20 to be provided in the split core plate 12 is opened (fourth step). Thereafter, the plate member 32 is conveyed by one pitch.

  FIG. 6 is a partially omitted plan view for explaining the fifth step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30.

  In the fifth step, new pilot holes 47 and 48 are opened by two pitches behind the pilot holes 47 and 48 opened in the third step by the pilot hole forming die 34. At the same time, by the pin hole molding die 36 of the first molding device 30a and the second molding device 30b, the third sheet in each molding device 30a, 30b is placed one pitch behind the pin hole 20 opened in the fourth step. A pin hole 20 to be provided in the first divided core plate 12 is opened.

  After the fifth step, the plate member 32 is conveyed by 3 pitches. Meanwhile, in the seventh step, new pilot holes 47 and 48 are opened by the pilot hole molding die 34.

  FIG. 7 is a partially omitted plan view for explaining the eighth step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30.

  In the eighth step, the first sheet (first division) in the first molding device 30a is positioned one pitch behind the pin hole 20 opened in the fifth step by the positioning convex molding die 38 of the first molding device 30a. A positioning convex portion 26 to be provided on the second divided core plate 16 in total including the core plate 12 is formed. That is, the first second divided core plate 16 is continuously formed after the third first divided core plate 12.

  At the same time, the outer shape (contour) of the first divided core plate 12 formed by the first molding device 30a is punched out by the outer shape extraction return mold 40 of the first molding device 30a, and pushback is performed. The pushback is a processing method for pushing the punched workpiece back to the original position when punching the workpiece (the first split core plate 12 and the second split core plate 16).

  Here, with reference to FIGS. 8A to 8C, the pushback mechanism of the outer shape extraction return mold 40 will be described by exemplifying a case where the first divided core plate 12 is formed.

  As shown in FIG. 8A, first, the plate member 32 is set to the outer shape extraction return die 40 under the positioning action by the pilot hole 47 and the pilot pin. The outer shape extraction mold 40 is composed of an upper mold 50 and a lower mold 52, and the lower mold 52 includes a pushback mechanism 54.

  Next, as shown in FIG. 8B, the upper mold 50 is lowered in the direction of the arrow Y1, and the first divided core plate 12 is punched out. Subsequently, the upper die 50 is raised, and the return portion 55 constituting the pushback mechanism 54 is raised in the direction of the arrow Y2.

  That is, as shown in FIG. 8C, the push-back mechanism 54 pushes back the first divided core plate 12 to the hole 57 of the plate member 32 formed by punching the first divided core plate 12. As a result, the first divided core plate 12 punched out as described above is fitted back into the punched hole portion 57 of the plate member 32 formed by punching itself, and is transported to the subsequent steps. .

  After the eighth step, the plate member 32 is conveyed by 4 pitches. Meanwhile, in the ninth and eleventh steps, new pilot holes 47 and 48 are sequentially opened by the pilot hole molding die 34. In the ninth to eleventh steps, new positioning convex portions 26 are sequentially formed by the positioning convex portion molding die 38 of the first molding apparatus 30a. Furthermore, the second and third first divided core plates 12 are drawn back and formed by the outer shape drawing / removing die 40 of the first forming device 30a (the ninth and tenth steps), and then the first piece (total) Then, the 4th) 2nd division | segmentation core plate 16 is extracted and shape | molded (11th process).

  FIG. 9 is a partially omitted plan view for explaining a twelfth step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30.

  In the twelfth step, a new positioning convex portion is formed one pitch behind the positioning convex portion 26 formed in the eleventh step by the positioning convex portion molding die 38 of the first molding device 30a and the second molding device 30b. 26 is formed. At the same time, the second sheet (5 in total) is placed behind one pitch of the second divided core plate 16 that has been drawn back and formed in the eleventh step by the outer shape drawing and returning mold 40 of the first molding device 30a. The second) divided core plate 16 is formed by pulling back.

  Further, in the twelfth step, the magnet hole 28 is opened in the first divided core plate 12 by the magnet hole forming die 42 of the first forming device 30a.

  After the twelfth step, the plate member 32 is conveyed by 6 pitches. Meanwhile, in the thirteenth to seventeenth steps, the pilot hole forming die 34 and the positioning projection forming die 38 of the first forming device 30a and the second forming device 30b, and the outer shape extraction die 40 of the first forming device 30a. Needless to say, the magnet hole forming mold 42 is appropriately operated, and predetermined processing is performed on the plate member 32.

  FIG. 10 is a partially omitted plan view for explaining the eighteenth step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30.

  In the 18th step, a new positioning convex portion 26 is formed by the positioning convex portion molding die 38 of the first molding device 30a and the second molding device 30b. At the same time, a new second split core plate 16 is extracted and molded by the outer shape extraction mold 40 of the first molding device 30a, and a magnet hole is formed in the new second split core plate 16 by the magnet hole molding mold 42. Open 28.

  Further, in the eighteenth step, the positioning projection formed on the protruding portion 29 of the second divided core plate 16 of the first sheet (the fourth sheet in total) by the pin hole extraction return mold 44 of the first molding device 30a. The part 26 and its peripheral part are punched into a circular shape, and pushback is performed. The punching range in this case coincides with the pin hole 20 formed in the protruding portion 24 of the first divided core plate 12 when the second divided core plate 16 is overlapped with the first divided core plate 12, that is, the pin It is set to be concentric and concentric with the hole 20. Accordingly, the positioning convex portion 26, which is a punched portion punched out as described above, and the peripheral portion thereof are pin holes formed in the protruding portion 29 of the second divided core plate formed by punching itself (the punched portion). (Hole) 20 is fitted back.

  The punching and pushback by the pin hole punching / returning die 44 are substantially the same as the processing method for punching and pushing back the first divided core plate 12 and the like by the outer shape punching / returning die 40, and therefore will be described in detail. Is omitted.

  After the eighteenth step, the plate member 32 is conveyed by 5 pitches. Meanwhile, in the nineteenth to twenty-second steps, the pilot hole forming die 34 and the positioning convex portion forming die 38 of the first forming device 30a and the second forming device 30b, and the outer shape extraction die 40 of the first forming device 30a. The magnet hole forming die 42 and the pin hole extracting return die 44 are appropriately operated to perform predetermined processing on the plate member 32.

  FIG. 11 is a partially omitted plan view for explaining the 23rd step of the method for manufacturing the rotor core 10 by the rotor core manufacturing line 30.

  In the 23rd step, the new pilot holes 47 and 48 and the positioning convex portion 26 are molded by the pilot hole molding die 34 and the positioning convex portion molding die 38 of the first molding device 30a and the second molding device 30b. At the same time, a new second split core plate 16 is extracted and molded by the outer shape extraction mold 40 of the first molding device 30a, and a magnet hole is formed in the new second split core plate 16 by the magnet hole molding mold 42. Open 28. Further, the pin hole 20 is extracted and formed in the positioning convex portion 26 of the new second divided core plate 16 by the pin hole extracting / returning mold 44 of the first forming apparatus 30a.

  In the 23rd step, since the first first core plate 12 reaches the dropout position of the dropout die 46 (range D surrounded by a dotted line in FIG. 12A), the dropout die 46 is removed. The first divided core plate 12 returned by push-back is pulled out after operating and punching with the outer shape extraction return mold 40. Such a punching die 46 is sequentially operated also in each subsequent process (from the 24th process), and the first divided core plate 12 and the second divided core plate 16 are arranged in an annular shape and stacked.

  Here, a method of dropping and stacking the first divided core plate 12 and the second divided core plate 16 with the drop mold 46 will be described with reference to FIGS. 12A to 16B.

  As shown in FIGS. 12A and 12B, the drop-off die 46 is mounted on the inner frame side of the upper frame body 56 having a stepped circumference on the inner side and the driving means (not shown). An annular caulking ring 58 configured to be rotatable, an annular lower frame 60 facing the lower end surface of the upper frame 56 at a predetermined distance, and the upper frame 56 and the lower frame 60. And an inner guide 62 provided on the inner peripheral side and configured to be movable up and down and rotatable by a driving means (not shown).

  The inner guide 62 has an outer peripheral surface on which the inner peripheral edge of the first core plate 14 and the second core plate 18 can be fitted and removed, in other words, an outer peripheral surface having a shape substantially coinciding with the annular edge. The upper guide 62a has a columnar shape, and the lower guide 62b is provided on the lower end side of the upper guide 62a and has a columnar shape having a larger diameter than the upper guide 62a. Accordingly, on the outer peripheral surface of the upper guide 62a, there are six recesses 62c that engage with the protrusions 24 and 29 formed on the inner peripheral side of the first core plate 14 and the second core plate 18 at equal intervals in the circumferential direction. They are arranged and extend in the axial direction. Further, a drive shaft 62d for moving the inner guide 62 up and down is attached to the lower end side of the lower guide 62b.

  In the drop-off die 46 configured in this way, first, the first first core plate 12 that has been drawn back by the outer shape withdrawal die 40 under the positioning action of the pilot hole 47 and the pilot pin. Is set at a position passing through the upper guide 62a (see FIG. 12B). That is, the first divided core plate 12 of the first sheet is set in the drop mold 46 at a position in a range D in FIG. 12A.

  Next, as shown in FIG. 12B, the punch 64 is lowered, and the first divided core plate 12 is removed from the plate member 32. As a result, the first divided core plate 12 that has been removed has an arcuate edge on the inner peripheral side that is in sliding contact with the outer peripheral surface of the upper guide 62a of the inner guide 62, and an arcuate edge on the outer peripheral side that is the upper frame 56. Or it is dropped in the vertical direction while being in sliding contact with the inner peripheral surface of the caulking ring 58, and placed on the upper surface of the lower guide 62b (see FIG. 13). Note that for this drop-out, for example, means capable of holding the first divided core plate 12 and placing it at a predetermined position may be used.

  Although the 23rd step is completed as described above, the operation of the removal mold 46 in the 24th step and after will be described.

  In the punching die 46 in the 24th step, first, the inner guide 62 (see FIG. 13) on which the first divided core plate 12 removed in the 23rd step is placed is set at a predetermined angle θ1. (In this embodiment, 120 degrees) It turns (refer FIG. 14). Next, the second first divided core plate 12 is pulled out to the upper surface of the lower guide 62 b of the inner guide 62 in the same manner as the first divided core plate 12. Then, as shown in FIG. 14, the removed second divided first core plate 12 is arranged in an annular shape together with the first divided first core plate 12.

  In the twenty-fifth process, in the drop mold 46, as in the twenty-fourth process, the inner guide 62 is further turned by a predetermined angle θ1, and then the third first divided core plate 12 is removed. Then, the third first divided core plate 12 that has been removed is arranged on the same plane side by side with the first and second first divided core plates 12, and an annular first core plate is formed. 14 is formed. The first core plate 14 constitutes the lowermost layer (first layer) of the rotor core 10.

  In the twenty-sixth step, in the drop mold 46, first, as shown in FIG. 15, the inner guide 62 on which the first core plate 14 is placed is turned by a predetermined angle θ2 (60 ° in the present embodiment).

  Next, the first (fourth in total) second divided core plate 16 is pulled out so as to be stacked on the first core plate 14. In this case, since the inner guide 62 has been swung in advance by a predetermined angle θ2, the center of the arc of the second divided core plate 16 that has been removed is the two first divided cores in the first core plate 14. The plates 12 (here, the first and third first divided core plates 12) are laminated so as to coincide with each other on the abutting end A1 (see FIG. 15).

  As a result, the first sheet is removed from one of the pin holes 20 of the first divided core plate 12 of the first sheet and one of the pin holes 20 of the first divided core plate 12 of the third sheet. The protrusions 26a of the two positioning protrusions 26 of the second divided core plate 16 engage (see FIG. 16A).

  Here, FIGS. 16A and 16B show a state in which the first divided core plate 12 and the second divided core plate 16 are sequentially laminated on the upper surface of the lower guide 62b of the inner guide 62 in the drop die 46. FIG. It is sectional drawing developed 360 degrees in the circumferential direction. In FIG. 16A and FIG. 16B, numerals 1 to 16 attached in the vicinity of the divided core plates 12 and 16 indicate the order formed in the rotor core manufacturing line 30. For example, “1” The first divided core plate 12 is shown as the first sheet, and “4” is the second divided core plate 16 as the first sheet.

  Subsequently, in the 27th and 28th steps, the inner guide 62 is turned by a predetermined angle θ1 (120 °), and the second and third (the fifth and sixth in total) second divided core plates 16 are removed. As a result, the second core plate 18 serving as the second layer of the rotor core 10 is laminated on the first core plate 14 serving as the first layer with a predetermined angle θ2 (60 °) shifted from the first layer. . At this time, the projections 26a of the positioning projections 26 of the second core plate 18 are engaged with the pin holes 20 of the first core plate 14 (see FIG. 16A).

  Similarly, in the 29th step, in the drop die 46, first, the inner guide 62 is turned by a predetermined angle θ2 (60 °), and then the fourth (seventh in total) second divided core plate 16 is moved. Cut off over the second layer. Next, the inner guide 62 is turned by a predetermined angle θ1 (120 °), and the fifth and sixth (a total of the eighth and ninth) second divided core plates 16 are removed (30th and 31st steps). As a result, the second core plate 18 serving as the third layer of the rotor core 10 is laminated on the second layer with a predetermined angle θ2 (60 °) shifted from the second layer. In this case, each convex part 26a of each positioning convex part 26 of the second core plate 18 of the third layer is engaged with each concave part 26b of each positioning convex part 26 of the second core plate 18 of the second layer. (See FIG. 16B).

  The method for removing and laminating the second divided core plate 16 by the removal mold 46 in the 32nd and subsequent steps is substantially the same as that in the 29th to 31st steps (see FIG. 16B). Description is omitted. In addition, about each process after the said 24th process, although only operation | movement by the drop die 46 was demonstrated, it cannot be overemphasized that another metal mold | die is also operate | moved suitably and predetermined processing with respect to the plate member 32 is implemented.

  Also in the second molding apparatus 30b, the plate members 32 are sequentially conveyed, and predetermined processing positions of the outer shape extraction return mold 40, the magnet hole forming mold 42, the pin hole extraction return mold 44 and the dropout mold 46 are processed. Is reached, a predetermined process is performed on the plate member 32 in the same manner as in the case of the first molding apparatus 30a. For example, as shown in FIG. 17, in the 43rd step, the first divided core plate 12 of the first sheet is removed by the removal mold 46 in the second molding apparatus 30 b.

  Thereafter, in the dropping mold 46 of the first molding device 30a and the second molding device 30b, the number of stacked plates is a predetermined number of layers (in the present embodiment, the second core plate 18 on the first core plate 14 of the lowest layer). The stacking operation is continued up to a total of 50 layers in which 49 sheets are stacked. When the first core plate 14 and the second core plate 18 are laminated to a predetermined number of layers (50th layer) to form the laminated body 10a (see FIG. 18), the conveyance of the plate member 32 is temporarily stopped. Next, a caulking operation of the laminated body 10a is performed.

  In the caulking operation, first, the removal mold 46 is separated from the conveying line of the plate member 32 by, for example, lowering or horizontal movement, and then the inner guide 62 is raised, and the laminated body 10a is moved to the inner periphery of the caulking ring 58. Set to a position where it contacts the surface (see FIG. 18).

  Next, the upper surface (50th layer upper surface) of the laminate 10a is pressed downward by the punch 66, and at the same time the lower surface (first layer lower surface) of the laminate 10a is pressed upward by the inner guide 62, Rotate (see FIGS. 18 and 19). Then, in the laminated body 10a, the convex portions 26a of the positioning convex portions 26 and the concave portions 26b (pin holes 20 in the first layer) are pressure-bonded (crimped) between the respective layers. Thereby, each layer of the laminated body 10a is integrally compression-molded, and for example, has a strength that does not cause a lamination deviation (position deviation) due to a light impact during transportation or the like.

  In this case, when crimping is performed by the punch 66 and the inner guide 62, the caulking ring 58 is rotated as described above, so that, for example, the positions of the convex portions 26a and the concave portions 26b between the layers are slightly shifted during lamination. Even in such a case where the layers are laminated, the sliding action of each layer on the outer circumferential surface of the ring due to the rotation of the caulking ring 58 provides an axial alignment action, which corrects these deviations, and more accurately. Crimped.

  Thereafter, in the removal mold 46, the inner guide 62 is lowered to the original position, and again returns to the conveying line of the plate member 32. Subsequently, the first divided core plate 12 of the first sheet (151 sheets from the first step) in the second time is again placed on the pressure-bonded laminated body 10a, and sequentially the first divided The core plate 12 and the second divided core plate 16 are stacked up to a predetermined number of layers in the same manner as in the steps described above.

  Then, as shown in FIG. 20A, when a new laminated body 10b is laminated on the pressure-bonded laminated body 10a, as in the case of the laminated body 10a, a punch 66 and an inner guide are formed on the laminated body 10b. A crimping operation is performed by 62, caulking ring 58, and the like. Thus, the inner guide 62 is in a state where the laminated bodies 10a and 10b after the press bonding are held. Note that the lowermost layer (first layer) of the stacked body 10b is configured by the first core plate 14 similarly to the lowermost layer of the stacked body 10a, and the lower surface thereof is a flat surface. For this reason, the lowermost layer (first layer) of the laminated body 10b is not engaged and pressed against the concave portion 26b of the positioning convex portion 26 of the uppermost layer (the 50th layer) of the laminated body 10a. The body 10a and the laminated body 10b are formed separately.

  Next, as illustrated in FIG. 20B, the inner guide 62 is lowered in a state where the stacked body 10 b is held at the position of the caulking ring 58. Then, the laminated body 10 b is held as it is by the caulking ring 58, while the laminated body 10 a is lowered together with the inner guide 62 and comes into contact with the lower frame body 60. Thereafter, by continuing the lowering of the inner guide 62, the stacked body 10 a is detached from the inner guide 62 and placed on the upper surface of the lower frame body 60.

  Therefore, as shown in FIG. 20C, by moving the carry-out member 68 in the horizontal direction on the upper surface of the lower frame 60, the stacked body 10a is easily pulled out and carried out from the mold 46, and the next process (fixing pin) 22 insertion process).

  In the rotor core production line 30, a new laminate is formed on the laminate 10b, and the rotor core 10 is configured from one strip-shaped plate member 32 by continuously performing such operations. The laminates 10a, 10b and the like can be continuously formed.

  Next, with reference to FIGS. 21 to 23, the fixing pin 22 is inserted into the laminated body 10 a formed in the rotor core manufacturing line 30 by the fixing pin insertion device 70, and the respective layers are joined. A method of molding the material will be described.

  The fixed pin insertion device 70 includes an upper surface pressing jig 72 and a lower surface pressing jig 74 that pressurize and hold the laminated body 10a constituting the rotor core 10 from the upper surface and the lower surface, and each of the laminated body 10a (rotor core 10). The pressing jig 76 is configured to insert the fixing pin 22 into the pin hole 20.

  The pressing jig 76 has a plurality of (six in this embodiment) jig pins 78 projecting from the lower surface (pressing direction surface) corresponding to the pin holes 20. The jig pins 78 are set to, for example, two types of lengths. In this case, the three jig pins 78a are set slightly longer than the remaining three jig pins 78b. The difference in length between the jig pin 78a and the jig pin 78b is, for example, greater than the thickness of each layer of the rotor core 10, that is, the thickness of one of the first core plate 14 and the second core plate 18. It is supposed to be.

  The upper surface pressing jig 72 is configured in a block shape that is slightly thicker than the length of the fixed pin 22, and a plurality (six in this embodiment) of guide holes 80 corresponding to the positions of the pin holes 20 pass therethrough. (See FIG. 22).

  The lower surface pressing jig 74 has substantially the same shape as the upper surface pressing jig 72, and a plurality (six in this embodiment) of discharge holes 82 corresponding to the positions of the pin holes 20 penetrate therethrough. (See FIG. 22).

  With the fixed pin insertion device 70 having such a configuration, first, the laminate 10a is held while being pressed using the upper surface pressing jig 72 and the lower surface pressing jig 74. At this time, the position of the pin hole 20 of the laminated body 10a is matched with the position of the guide hole 80 of the upper surface pressurizing jig 72 and the position of the discharge hole 82 of the lower surface pressurizing jig 74 by positioning means (not shown). Set so that they are concentric and continuous.

  Next, after inserting the fixing pins 22 into the guide holes 80 of the upper surface pressing jig 72, the jig pins 78 of the pressing jig 76 are inserted into the guide holes 80 from above the fixing pins 22. Then, by pressing the pressing jig 76 downward, the fixing pins 22 are pressed down by the jig pins 78. Then, as shown in FIG. 22, the positioning convex portion 26 which is a punched portion pulled out by the pin hole punching return mold 44 in each layer and the peripheral portion thereof are fixed in accordance with the pressing action of the jig pin 78. The pin 22 is pressed down and punched out, and is continuously discharged into the discharge hole 82 of the lower surface pressing jig 74.

  In this case, the pressing jig 76 uses the jig pins 78a and 78b having two types of lengths as described above. For this reason, in each layer constituting the laminate 10a, first, half (three) of the punched portions (positioning convex portions 26 and their peripheral portions) are punched out, and then the remaining half (three) of the positioning convex portions 26. Are gradually discharged to the discharge hole 82 while being pushed out. Therefore, in each layer of the laminated body 10a, when the fixing pin 22 is inserted and coupled to the upper layer by the first three jig pins 78a, the remaining three punched portions are always It exists in the state crimped | bonded with the positioning convex part 26 of the upper layer and the lower layer. That is, at the time of inserting the fixing pin 22, since half of the positioning convex portions 26 always maintain the positioning function in each layer, the stacking misalignment (position misalignment) at the time of the inserting can be effectively suppressed. The fixing pin 22 can be inserted accurately and quickly. In this case, even when the fixing pin 22 is inserted into the lowermost layer (first layer), the positioning convex portion 26 dropped stepwise from the upper layer is fitted into the pinhole 20 of the lowermost layer. It has become stuck. Accordingly, a part of the convex portion 26a of the positioning convex portion 26 is engaged with the discharge hole 82 of the lower surface pressurizing jig 74, thereby achieving the above-described stacking misalignment preventing function.

  Then, as shown in FIG. 23, after all the fixing pins 22 are inserted and inserted until the layers of the laminated body 10a are connected to each other and the layers of the laminated body 10a are firmly bonded, the pressing jig 76 and the upper surface pressure are applied. Forming the rotor core 10 is completed by separating the jig 72 and the lower surface pressing jig 74 from each other.

  In the pressing jig 76, half of the jig pins 78 are jig pins 78a, and the other half are jig pins 78b. If at least one of the pins is set, one can prevent stacking misalignment. However, two or more are preferable. Further, for example, the jig pins 78 of the pressing jig 76 are set to a half of the number of the pin holes 20, and after the half of the fixed pins 22 are first inserted, the remaining fixed pins 22 are inserted. It can also be configured.

  As described above, according to the method for manufacturing the rotor core 10 according to the first embodiment, as shown in FIG. 17, the first divided core plate 12 and the second divided core are almost free from one plate member 32. The plate 16 can be cut out, and the utilization factor of the plate member 32 can be further improved. Further, the first divided core plate 12 and the second divided core plate 16 can be molded while the plate member 32 is continuously conveyed, and these can be quickly stacked. Therefore, the rotor core 10 can be molded with high efficiency and speed, and the production efficiency is extremely high.

  In addition, since the removal die 46 is provided with a caulking ring 58, an inner guide 62, and the like, the first divided core plate 12 and the like can be laminated accurately and quickly, and the laminated body can be easily formed. Can be crimped. Furthermore, the pressure-bonded laminate can be quickly carried out to the next process. Therefore, the laminated body which comprises the rotor core 10 can be shape | molded continuously, almost without stopping the rotor core manufacturing line 30, and the manufacturing efficiency of the rotor core 10 improves further.

  Furthermore, in the fixed pin insertion device 70, the punched portion pulled back by the pin hole punching die 44 is continuously pressed downward by the fixed pins 22 under the pressing action of the jig pins 78. Each layer can be coupled very easily and quickly by discharging and inserting the fixing pin 22 into each pin hole 20 of each layer. In addition, in the fixed pin insertion device 70, two types of lengths of the jig pins 78 constituting the pressing jig 76 that presses the fixed pins 22 are set, so that the fixed pins 22 can be inserted into the pin holes 20. Insertion work can be performed with a time difference. For this reason, it is possible to effectively suppress the stacking deviation at the time of insertion, and it is possible to more accurately and quickly insert and fix the fixing pins 22 to connect the layers.

  Further, in the rotor core 10 according to the first embodiment, the stacked layers are overlapped with each other with a predetermined angle θ2 shifted from each other, and the fixing pin 22 is inserted so as to penetrate these layers. Thus, since each layer is couple | bonded by the fixing pin 22, the rotor core 10 can be manufactured at low cost compared with the said conventional method which casts the boss | hub part of an inner peripheral side, Furthermore, the said Since the fixing pin 22 is inserted into and joined to the overlapping portion where each layer is shifted and overlapped, it has a practically sufficient strength.

  Next, a rotor core manufacturing method and a rotor core manufactured by the manufacturing method according to the second embodiment of the present invention will be described mainly with reference to FIGS. 24 to 27B, the same reference numerals as those shown in FIGS. 1 to 23 indicate the same or similar configurations, and thus are described in detail as having the same or similar functions and effects. Is omitted.

  FIG. 24 is an exploded perspective view in which a part of the rotor core 100 according to the second embodiment is disassembled.

  As shown in FIG. 24, in the rotor core 100, an adhesive 102 (shown by a broken line mesh pattern in FIG. 24) is applied to the upper and lower surfaces (surfaces) of the first divided core plate 12 and the second divided core plate 16. It has been applied.

  In this case, the adhesive 102 is applied in advance to the upper and lower surfaces (surfaces) of the plate member 32 that is a material steel plate of the first divided core plate 12 and the second divided core plate 16. The adhesive 102 is formed in a substantially thin film shape when applied to the surface of the plate member 32, the first divided core plate 12, etc., and does not exhibit its adhesive force, and is subjected to heat treatment and cooling treatment. Adhesive strength is exhibited (effective) when it is applied.

  The plate member 32 coated with the adhesive 102 is first subjected to predetermined processing by the rotor core production line 30 (see FIGS. 3 to 20), similarly to the method for producing the rotor core 10 according to the first embodiment. Is given. Accordingly, the first divided core plate 12 and the second divided core plate 16 to which the adhesive 102 is applied are laminated while being sequentially formed from the plate member 32 to which the adhesive 102 is applied, and are the same as the laminated body 10a and the like. The laminated body 100a configured as described above is formed.

  In the second embodiment, the fixed pin 22 is inserted into the laminated body 100a formed in this way by the fixed pin inserting device 110 having a partial configuration different from that of the fixed pin inserting device 70. Join.

  As shown in FIG. 25, the fixed pin insertion device 110 has an upper surface pressurizing treatment in which a threaded portion 112 penetrating in the center is formed instead of the upper surface pressure jig 72 in the fixed pin insertion device 70. A tool 114 is provided, and instead of the lower surface pressurizing jig 74, a lower surface pressurizing jig 118 having a bolt insertion hole 116 penetrating in the center is provided.

  In the fixed pin insertion device 110, the method of connecting the layers by inserting the fixed pins 22 into the laminate 100a is the same as the method using the fixed pin insertion device 70 (see FIGS. 21 to 23). Detailed description will be omitted.

  In the method for manufacturing the rotor core 100 according to the second embodiment, after the layers of the laminate 100a are coupled by the fixing pins 22 by the fixing pin insertion device 110, the pressing jig 76, the upper surface pressing jig 114, and The lower surface pressing jig 118 is not separated, and the process proceeds to the next step (the heating / cooling processing step of the stacked body 100a) while holding the stacked body 100a with these.

  With reference to FIGS. 26 to 27B, a method of forming the rotor core 100 by heating and cooling the laminated body 100 a connected by the fixing pins 22 to bond the layers more firmly with the adhesive 102 will be described.

  First, as shown in FIG. 26, in the state where the laminated body 100a in which the fixing pin 22 is inserted is sandwiched between the pressing jig 76, the upper surface pressing jig 114, and the lower surface pressing jig 118, The bolt 120 is inserted through 116 and the bolt 120 is screwed into the screw portion 112. That is, the bolt 120 passes through the bolt insertion hole 116 and is fastened to the screw portion 112 in a state of passing through the inside of the laminated body 100a.

  In this case, the fastening operation of the bolt 120 is performed while pressing the pressing jig 76 in a direction (downward in FIG. 26) opposite to the traveling direction of the bolt 120 (upward in FIG. 26). As a result, the upper surface pressing jig 114 and the lower surface pressing jig 118 are fastened firmly and without gaps by the bolts 120 with the stacked body 100a interposed therebetween, and the stacked body 100a is firmly clamped.

  Next, the pressing jig 76 is separated, and the discharged waste remaining in the discharge hole 82 of the lower surface pressing jig 118 (the positioning convex portion 26 of the second core plate 18 discharged by the fixing pin 22 and its Discard the edge.

  Then, as shown in FIGS. 27A and 27B, the stacked body 100 a that is firmly clamped by the upper surface pressing jig 114, the lower surface pressing jig 118, and the bolt 120 is heated in the heating furnace 122. In the heating furnace 122, the adhesive 102 is heated for a predetermined time at a temperature at which the adhesive 102 can be dissolved. As a result, the adhesive 102 is reliably dissolved and sufficiently penetrates between the layers of the laminate 100a.

  Thereafter, the laminate 100a is cooled (for example, allowed to stand at room temperature for a predetermined time), whereby the adhesive 102 that has penetrated between the layers is solidified to exert an adhesive force, and the layers of the laminate 100a are tightly bonded tightly. The Subsequently, when the upper surface pressing jig 114, the lower surface pressing jig 118, and the bolt 120 are removed, the formation of the rotor core 100 in which the respective layers are bonded extremely firmly is completed.

  As shown in FIG. 27A, as the heating furnace 122, a furnace having a plurality of shelves 122a in the furnace and having a sufficiently large volume as compared with the stacked body 100a is used. When configured so that heat treatment can be performed simultaneously, the rotor core 100 can be manufactured more efficiently.

  As described above, according to the method of manufacturing the rotor core 100 according to the second embodiment, the layers of the stacked body 100a can be more firmly bonded by the fixing pin 22 and the adhesive 102. For this reason, it becomes possible to mold the rotor core 100 with extremely high strength.

  Further, since the adhesive 102 need only be applied to the strip-shaped plate member 32 that is a raw steel plate, it can be easily and quickly applied by various methods including spraying, brushing, dipping, and the like.

  Furthermore, the laminated body 100a can be transported to the heating furnace 122 simply by performing a fastening operation with the bolt 120 after the fixing pin 22 is inserted by the fixing pin insertion device 110. Therefore, the rotor core 100 can be manufactured with extremely high efficiency.

  Note that the present invention is not limited to the above-described embodiments, and it is naturally possible to adopt various configurations without departing from the gist of the present invention.

  For example, although the number of divided core plates constituting each layer is three in each of the above embodiments, it is needless to say that the number of divided core plates is not limited to this. Change it.

  Moreover, the arrangement | positioning etc. of each metal mold | die which comprises the rotor core manufacturing line 30 can be changed, and the structure of this each metal mold | die can also be changed according to the shape etc. of the rotor core manufactured.

  Furthermore, in the rotor core manufacturing line 30, although it demonstrated as what can manufacture two rotor cores simultaneously from the plate member 32, these may be only one or three or more.

  Furthermore, the number of fixing pins 22 that couple the rotor core 10 is not limited to six. Similarly, the number of pin holes 20 is not limited to six.

It is a perspective view of the rotor core manufactured by the manufacturing method of the rotor core which concerns on the 1st Embodiment of this invention. It is the disassembled perspective view which decomposed | disassembled some rotor cores shown in FIG. It is a schematic block diagram which shows the structure of the rotor core manufacturing line used for the manufacturing method of the rotor core which concerns on the 1st Embodiment of this invention. FIG. 4 is a partially omitted plan view for explaining a first step of a rotor core manufacturing method by the rotor core manufacturing line shown in FIG. 3. FIG. 5 is a partially omitted plan view for explaining a third step of the rotor core manufacturing method by the rotor core manufacturing line shown in FIG. 3. FIG. 10 is a partially omitted plan view for explaining a fifth step of the rotor core manufacturing method by the rotor core manufacturing line shown in FIG. 3. FIG. 10 is a partially omitted plan view for explaining an eighth step of the rotor core manufacturing method by the rotor core manufacturing line shown in FIG. 3. FIG. 8A is a schematic cross-sectional view showing a state in which a plate member is set in the outer shape extraction mold of the rotor core manufacturing line shown in FIG. 3, and FIG. 8B shows a split core plate by the upper mold of the outer shape extraction mold. FIG. 8C is a schematic cross-sectional view showing a state in which the divided core plate punched out by the outer shape extraction return mold is pushed back. FIG. 10 is a partially omitted plan view for explaining a twelfth step of the rotor core manufacturing method by the rotor core manufacturing line shown in FIG. 3. It is a partially-omission plan view explaining the 18th process of the manufacturing method of the rotor core by the rotor core manufacturing line shown in FIG. It is a partially-omission top view explaining the 23rd process of the manufacturing method of the rotor core by the rotor core manufacturing line shown in FIG. 12A is a partially omitted plan view showing an enlarged part of the punching die of the rotor core production line shown in FIG. 3, and FIG. 12B is a schematic cross-sectional view taken along line XIIB-XIIB in FIG. 12A. FIG. 4 is a partially omitted plan view showing a state in which a first first divided core plate is removed by a withdrawal mold of the rotor core production line shown in FIG. 3. FIG. 4 is a partially omitted plan view showing a state in which a second first divided core plate is removed by a removal mold of the rotor core production line shown in FIG. 3. FIG. 4 is a partially omitted plan view showing a state in which an inner guide is turned by a predetermined angle after a third first divided core plate is removed by a removal mold of the rotor core production line shown in FIG. 3. 16A is a cross-sectional view developed 360 ° in the circumferential direction showing a state in which the second core plate is stacked on the first core plate by the drop die of the rotor core production line shown in FIG. 3, and FIG. FIG. 4 is a cross-sectional view developed 360 ° in the circumferential direction showing a state in which an upper second core plate is stacked on a second core plate by the drop-off mold. It is a partially-omission top view explaining the 43rd process of the manufacturing method of the rotor core by the rotor core manufacturing line shown in FIG. It is a schematic sectional drawing which shows the state which is implementing the crimping | compression-bonding operation | work of a laminated body with the dropping die of the rotor core manufacturing line shown in FIG. FIG. 4 is a partially omitted plan view showing a state in which a laminated body is crimped by a punching die of the rotor core production line shown in FIG. 3. 20A is a schematic cross-sectional view showing a state in which the next laminated body is placed on the laminated body that has been pressure-bonded by the die of the rotor core production line shown in FIG. 3, and FIG. FIG. 20C is a schematic cross-sectional view showing a state in which the laminated body previously pressed by lowering the inner guide of the mold is lowered, and FIG. 20C is a schematic cross-sectional view showing a state in which the processed laminated body is unloaded. . FIG. 4 is a schematic perspective view showing a state in which a fixed pin is inserted into a laminate formed by the rotor core manufacturing line shown in FIG. 3 by a fixed pin insertion device. It is sectional drawing developed 360 degrees in the circumferential direction which shows the state which has fixed pin inserted in the laminated body by the said fixed pin insertion apparatus. It is sectional drawing developed 360 degrees in the circumferential direction which shows the state which fixed pin was inserted in the laminated body by the said fixed pin insertion apparatus. It is the disassembled perspective view which decomposed | disassembled some rotor cores concerning the 2nd Embodiment of this invention. In the said 2nd Embodiment, it is a schematic perspective view which shows the state which has made the fixing pin insert in the laminated body by the fixing pin insertion apparatus. FIG. 26 is a cross-sectional view taken along line XXVI-XXVI in FIG. 25. FIG. 27A is an explanatory view showing a state in which a plurality of the laminates shown in FIG. 25 are simultaneously heated in a heating furnace, and FIG. 27B is an enlarged cross-sectional view of one of the laminates shown in FIG. 27A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100 ... Rotor core 12 ... 1st division | segmentation core plate 14 ... 1st core plate 16 ... 2nd division | segmentation core plate 18 ... 2nd core plate 20 ... Pin hole 22 ... Fixed pin 24, 29 ... Protrusion part 26 ... Positioning convex part DESCRIPTION OF SYMBOLS 30 ... Rotor core manufacturing line 30a ... 1st shaping | molding apparatus 30b ... 2nd shaping | molding apparatus 32 ... Plate member 34 ... Pilot hole shaping die 36 ... Pin hole shaping die 38 ... Positioning convex-shaped shaping die 40 ... Outline extraction return die 42 ... Magnet hole forming die 44 ... Pin hole punching back die 46 ... Removal die 54 ... Pushback mechanism 56 ... Upper frame body 58 ... Caulking 60 ... Lower frame body 62 ... Inner guides 64, 66 ... Punch 70 , 110 ... Fixed pin insertion device 72, 114 ... Upper surface pressing jig 74, 118 ... Lower surface pressing jig 76 ... Pressing jig 78 ... Jig pin 102 ... Adhesive 120 ... Bolt 122 ... Heating furnace

Claims (7)

A method of manufacturing a rotor core to be joined after arranging and laminating a plurality of divided core plates in an annular shape,
A first step of punching and forming the joint provided on the split core plate and then returning the punched portion to the punched portion of the split core plate;
After the first step, a plurality of divided core plates are arranged in an annular shape, and a second step of laminating the connecting portions of each layer so as to be continuous in the axial direction;
After the second step, a third step of coupling the layers by inserting a coupling member into the coupling portion of the stacked divided core plates while discharging the punched portion; and
A method for manufacturing a rotor core, comprising: In the manufacturing method of the rotor core according to claim 1,
Each of the divided core plates is pre-applied with an adhesive,
After the third step, the rotor core has a fourth step of performing a heating process and a cooling process for making the adhesive force of the adhesive effective on the laminate in which the layers are bonded by the bonding member. Manufacturing method. In the manufacturing method of the rotor core according to claim 1 or 2,
In the second step, the rotor core manufacturing method is characterized in that the end portions of the divided core plates between the overlapping layers are alternately stacked while being shifted from each other by a predetermined distance. In the manufacturing method of the rotor core according to claim 3,
Each of the divided core plates is provided with a plurality of the coupling portions, and the coupling portion of each of the divided core plates disposed in the lowermost layer in the second step is a through hole, and is disposed in other than the lowermost layer As the positioning portion in which the coupling portion of each split core plate is formed with a concave portion on the upper surface side and a convex portion protruding downward on the lower surface side,
In the second step, the layers are stacked while positioning the respective layers by locking the convex portions of the upper divided core plates by the through holes or the concave portions of the lower divided core plates. A method for manufacturing a rotor core. In the manufacturing method of the rotor core according to claim 4,
In the third step, after the coupling member is inserted into a part of the coupling parts of the divided core plates constituting the same layer, the coupling member is inserted into the remaining coupling parts. A method for manufacturing a rotor core, characterized by comprising: A rotor core in which a plurality of split core plates are arranged in an annular shape and laminated in a stacked state,
Between the overlapping layers, the ends of each of the divided core plates are alternately stacked with a predetermined distance from each other,
A rotor core, wherein each layer is coupled by a coupling member inserted along the stacking direction. The rotor core according to claim 6, wherein
Further, the rotor core is characterized in that the layers are bonded with an adhesive.

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