JP2021125953A - Manufacturing method of laminated iron core and manufacturing device of laminated iron core - Google Patents

Abstract

To describe a manufacturing method of a laminated iron core and a manufacturing device of a laminated iron core that can achieve a higher processing speed of a metal plate.SOLUTION: An example of a manufacturing method of a laminated iron core may be a method of manufacturing a laminated iron core by laminating a plurality of punched parts obtained by punching a strip of a metal plate with a press processing device while intermittently conveying the metal plate along a longitudinal direction thereof. An example of the manufacturing method of the laminated iron core may include, at least after a punching process to the metal plate by the press processing device, suctioning the metal plate upwardly and conveying the metal plate along the longitudinal direction after the suctioning of the metal plate.SELECTED DRAWING: Figure 5

Description

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

In Patent Document 1, while intermittently feeding out a strip-shaped metal plate, the metal plate is punched into a predetermined shape using a punch and a die to form a plurality of punched members, and a plurality of punched members are laminated. Discloses a method for manufacturing a laminated iron core, including obtaining a laminated iron core. In this method, when the metal plate is intermittently sent out, the metal plate is lifted by a plurality of lifters protruding from the die plate.

Japanese Unexamined Patent Publication No. 2003-2000296

In recent years, there has been a tendency to use thinner metal plates for manufacturing laminated iron cores for the purpose of improving magnetic properties. However, the thinner the metal plate, the easier it is for a part of the metal plate to bend during the press working. Therefore, the amount of rise of the metal plate by the lifter tends to be large so that the bent portion of the metal plate does not collide with the die during the transportation of the metal plate. In this case, the metal plate cannot be conveyed until the metal plate reaches a predetermined height, and there is a concern that the processing speed of the metal plate may decrease.

Therefore, the present disclosure describes a method for manufacturing a laminated iron core and an apparatus for manufacturing a laminated iron core, which can further increase the processing speed of a metal plate.

An example of a method for manufacturing a laminated iron core is a method of manufacturing a laminated iron core by laminating a plurality of punched members obtained by punching a strip-shaped metal plate intermittently along its longitudinal direction with a press working apparatus. It may be. An example of a method for manufacturing a laminated iron core is to suck the metal plate upward after at least punching the metal plate by a press working apparatus, and after sucking the metal plate, the metal plate is drawn along the longitudinal direction. It may include transporting the metal.

An example of a laminated iron core manufacturing device is a delivery device configured to intermittently convey a strip-shaped metal plate along its longitudinal direction, and a plurality of punched members punched out from the metal plate and laminated. It may be equipped with a press working apparatus configured to manufacture an iron core. An example of a laminated iron core manufacturing apparatus may further include a suction device configured to suck the metal plate upward after at least punching the metal plate by a press working device, and a control unit. .. The control unit may be configured to perform a process of transporting the metal plate along the longitudinal direction by the delivery device after the suction device sucks the metal plate.

According to the method for manufacturing a laminated iron core and the apparatus for manufacturing a laminated iron core according to the present disclosure, it is possible to further increase the processing speed of the metal plate.

FIG. 1 is a perspective view showing an example of a stator laminated iron core. FIG. 2 is a schematic view showing an example of an apparatus for manufacturing a stator laminated iron core. FIG. 3 is a schematic cross-sectional view showing an example of a press working apparatus. FIG. 4 is an exploded perspective view showing an example of a die plate and a stripper. FIG. 5 is a cross-sectional view partially showing an example of a die plate and a stripper. FIG. 6 is a diagram for explaining a process in which a metal plate is pressed. FIG. 7 is a perspective view showing an example of a rotor laminated iron core. FIG. 8 is a diagram showing an example of a layout of a metal plate.

In the following description, the same code will be used for the same element or the element having the same function, and duplicate description will be omitted.

[Structure of stator laminated iron core]
First, the configuration of the stator laminated iron core 10 (laminated iron core) will be described with reference to FIG. The stator laminated iron core 10 is a part of a stator (stator). The stator is configured by attaching a winding (not shown) to the stator laminated iron core 10. A motor is constructed by combining the stator with the rotor.

The stator laminated iron core 10 has a cylindrical shape. A through hole 10a (center hole) penetrating the stator laminated iron core 10 is provided in the central portion of the stator laminated iron core 10 so as to extend along the central axis Ax. The through hole 10a extends in the height direction (vertical direction) of the stator laminated iron core 10. A rotor can be arranged in the through hole 10a.

The stator laminated iron core 10 includes a yoke 11 and a plurality of teeth 12. The yoke 11 has an annular shape and extends so as to surround the central axis Ax. Each of the plurality of teeth 12 extends along the radial direction of the yoke 11 from the inner edge of the yoke 11 toward the central axis Ax side. Each of the plurality of teeth 12 projects from the inner edge of the yoke 11 toward the central axis Ax side. The teeth 12 may be arranged at substantially equal intervals in the circumferential direction of the yoke 11. A slot 13 which is a space for arranging a winding (not shown) is defined between the adjacent teeth 12.

The stator laminated iron core 10 is a laminated body in which a plurality of punched members W are stacked. The punched member W is a plate-like body in which a strip-shaped metal plate MS (for example, an electromagnetic steel plate) described later is punched into a predetermined shape, and has a shape corresponding to the stator laminated iron core 10. The punching member W includes a through hole Wa corresponding to the through hole 10a, a yoke portion W1 corresponding to the yoke 11, and a plurality of teeth portions W2 (cantilever portions) corresponding to each tooth 12. A space W3 corresponding to the slot 13 is defined between the adjacent teeth portions W2. The punching members W adjacent to each other in the height direction may be fastened by caulking, may be joined by an adhesive, or may be joined by welding.

The stator laminated iron core 10 may be configured by so-called transloading or skewing. "Transposition" means stacking a plurality of punching members W while relatively shifting the angles of the punching members W. Rolling is mainly carried out for the purpose of canceling the plate thickness deviation of the punching member W and increasing the flatness, parallelism and squareness of the stator laminated iron core 10. "Skew" means stacking a plurality of punching members W so as to have a twist angle with respect to the central axis Ax. Skew is performed for the purpose of reducing cogging torque, torque ripple, and the like. The rollover or skew angle may be set to any size.

[Manufacturing equipment for stator laminated iron core]
Subsequently, the manufacturing apparatus 100 of the stator laminated iron core 10 will be described with reference to FIG. The manufacturing apparatus 100 is configured to manufacture the stator laminated iron core 10 from the strip-shaped metal plate MS. The manufacturing apparatus 100 includes an anchorer 110, a sending apparatus 120, a press working apparatus 130, and a controller Ctr (control unit).

The uncoiler 110 is configured to rotatably hold the coil material 111. The coil material 111 is a metal plate MS wound in a coil shape (spiral shape). The delivery 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 an instruction signal from the controller Ctr, and intermittently and sequentially feed the metal plate MS toward the press working apparatus 130.

The press working apparatus 130 is configured to operate based on an instruction signal from the controller Ctr. The press processing device 130 may be configured to sequentially punch the metal plate MS delivered by the delivery device 120 by punches P1 to P3 described later, for example.

The controller Ctr so as to generate an instruction signal for operating the transmission device 120 and the press working device 130 based on, for example, a program recorded on a recording medium (not shown) or an operation input from an operator. It is configured. The controller Ctr is configured to transmit the instruction signal to the transmission device 120 and the press processing device 130, respectively.

[Details of press processing equipment]
Subsequently, the details of the press working apparatus 130 will be described with reference to FIGS. 3 to 5. As shown in FIG. 3, the press working apparatus 130 includes a lower die 140, an upper die 150, a press machine 160, and a suction device 170. The lower die 140 includes a base 141, a die holder 142, a die plate 143, a plurality of dies D1 to D3, a plurality of guide posts 144, a plurality of lifters 145, and a transfer device 146.

The base 141 is fixed, for example, on a press bolster (not shown). The die holder 142 is supported on the base 141. A plurality of discharge holes C1 to C3 are formed in the die holder 142. The plurality of discharge holes C1 to C3 may extend inside the die holder 142 along the vertical direction. Materials punched from the metal plate MS (for example, punched members, waste materials, etc.) are discharged into the plurality of discharge holes C1 to C3.

The die plate 143 is supported on the die holder 142. The die plate 143 is configured to hold a plurality of dies D1 to D3, respectively, as shown in FIGS. 3 to 5. The dies D1 to D3 are respectively arranged in the holding holes provided in the die plate 143. The plurality of dies D1 to D3 are arranged in this order from the upstream side to the downstream side in the transport direction of the metal plate MS. Each of the plurality of dies D1 to D3 is provided with die holes D1a to D3a penetrating in the vertical direction.

As shown in FIG. 3, the die hole D1a communicates with the discharge hole C1 and constitutes a first processing unit for punching the metal plate MS together with the punch P1 described later. By inserting and punching the punch P1 into the die hole D1a, the metal plate MS is punched in a shape along the contour of the die hole D1a. As a result, as shown in FIG. 4, a plurality of spaces W3 of the punching member W are formed in the metal plate MS. The plurality of spaces W3 are arranged in an annular shape when viewed from above in the metal plate MS. The metal piece punched out from the metal plate MS is discharged to the outside of the press working apparatus 130 through the discharge hole C1.

As shown in FIG. 3, the die hole D2a communicates with the discharge hole C2, and together with the punch P2 described later, constitutes a second processing unit for punching the metal plate MS. By inserting and punching the punch P2 into the die hole D2a, the metal plate MS is punched in a shape along the contour of the die hole D2a. As a result, as shown in FIG. 4, a through hole Wa of the punching member W is formed in the metal plate MS. The metal piece punched out from the metal plate MS is discharged to the outside of the press working apparatus 130 through the discharge hole C2.

At this time, the through hole Wa communicates with the plurality of spaces W3 on the inner peripheral side of the plurality of spaces W3. Therefore, a plurality of tooth portions W2 of the punching member W are formed on the metal plate MS. The plurality of tooth portions W2 are configured as cantilevered plate pieces with respect to the metal plate MS. The plurality of tooth portions W2 are arranged in an annular shape when viewed from above in the metal plate MS. That is, the plurality of teeth portions W2 are a teeth portion W2 that protrudes from the upstream side to the downstream side in the transport direction of the metal plate MS and a teeth that protrudes from the downstream side to the upstream side in the transport direction of the metal plate MS. A portion W2 and a teeth portion W2 protruding in the width direction of the metal plate MS are included.

As shown in FIG. 3, the die hole D3a communicates with the discharge hole C3, and together with the punch P3 described later, constitutes a third processing unit for punching the metal plate MS. By inserting and punching the punch P3 into the die hole D3a, the metal plate MS is punched in a shape along the contour of the die hole D3a. As a result, as shown in FIG. 4, a through hole R having a shape corresponding to the outer shape of the punched member W is formed in the metal plate MS. A predetermined number of punched members W punched out from the metal plate MS are laminated while being coupled to each other in the die hole D3a. As a result, the stator laminated iron core 10 is manufactured. The stator laminated iron core 10 is discharged to the outside of the press working apparatus 130 through the discharge hole C3.

The plurality of guide posts 144 extend linearly upward from the die holder 142. The plurality of guide posts 144, together with the guide bush 151a described later, are configured to guide the upper die 150 in the vertical direction. The plurality of guide posts 144 may be attached to the upper mold 150 so as to extend downward from the upper mold 150.

The plurality of lifters 145 are provided on the die plate 143 as shown in FIGS. 3 to 5. The plurality of lifters 145 are arranged so as to be located around the dies D1 to D3. Each lifter 145 includes a lift pin 145a and an urging member 145b, as shown in FIG.

The lift pin 145a is configured to be slidable in the insertion hole 143a of the die plate 143. The opening of the insertion hole 143a is exposed on the upper surface of the die plate 143. The urging member 145b is arranged in the insertion hole 143a and is configured to urge the lift pin 145a upward. Therefore, when the lift pin 145a is pushed down from above against the urging force of the urging member 145b, substantially the entire lift pin 145a is accommodated in the insertion hole 143a (see FIG. 6A). ). On the other hand, when such an urging force does not act on the lift pin 145a, the upper portion of the lift pin 145a protrudes upward from the insertion hole 143a (see FIGS. 5 and 6 (b)).

The transfer device 146 operates based on an instruction from the controller Ctr, and is configured to send the stator laminated iron core 10 obtained by press working from the metal plate MS to a subsequent device. As shown in FIG. 3, one end of the transfer device 146 may be located in the discharge hole C3, and the other end of the transfer device 146 may be located outside the press working device 130. The transport device 146 may be, for example, a belt conveyor.

The upper die 150 includes a punch holder 151, a stripper 152, and a plurality of punches P1 to P3. The punch holder 151 is arranged above the die plate 143 so as to face the die plate 143. The punch holder 151 is configured to hold a plurality of punches P1 to P3 on the lower surface side thereof.

The punch holder 151 is provided with a plurality of guide bushes 151a. The plurality of guide bushes 151a are respectively positioned so as to correspond to the plurality of guide posts 144. The guide bush 151a has a cylindrical shape, and the guide post 144 is configured to be slidable in the internal space of the guide bush 151a. When the guide post 144 is attached to the upper die 150, the guide bush 151a may be provided on the lower die 140.

The punch holder 151 is provided with a plurality of through holes 151b. A step-like step is formed on the inner peripheral surface of the through hole 151b. Therefore, the diameter of the upper part of the through hole 151b is set smaller than the diameter of the lower part of the through hole 151b.

When punching the metal plate MS with the punches P1 to P3, the stripper 152 sandwiches the metal plate MS with the die plate 143 and removes the metal plate MS biting into the punches P1 to P3 from the punches P1 to P3. It is configured in. By sandwiching the metal plate MS between the stripper 152 and the die plate 143, movement (positional deviation) in the transport direction during press working or the like is restricted. The stripper 152 is arranged between the die plate 143 and the punch holder 151.

The stripper 152 is connected to the punch holder 151 via a connecting member 153. The connecting member 153 includes a long main body portion and a head portion provided at the upper end of the main body portion. The main body of the connecting member 153 is inserted under the through hole 151b, and can move up and down in the through hole 151b. The lower end of the main body of the connecting member 153 is fixed to the stripper 152. An urging member 154 such as a compression coil spring may be attached around the main body of the connecting member 153 so as to be located between the punch holder 151 and the stripper 152. In this case, the stripper 152 is urged by the urging member 154 in a direction away from the punch holder 151.

The head of the connecting member 153 is arranged above the through hole 151b. The outer shape of the head of the connecting member 153 is set to be larger than the outer shape of the main body of the connecting member 153 when viewed from above. Therefore, the head of the connecting member 153 can move up and down in the upper part of the through hole 151b, but the step of the through hole 151b functions as a stopper so that the head of the connecting member 153 cannot pass through the lower part of the through hole 151b. Therefore, the stripper 152 is suspended and held by the connecting member 153 with respect to the punch holder 151 so that the stripper 152 can move up and down relative to the punch holder 151.

The stripper 152 is provided with through holes E1 to E3 at positions corresponding to punches P1 to P3, respectively. The through holes E1 to E3 extend along the vertical direction. The through holes E1 to E3 communicate with the corresponding die holes D1a to D3a when viewed from above. The lower parts of the punches P1 to P3 are slidable in the corresponding through holes E1 to E3, respectively.

As shown in FIGS. 3 to 5, the stripper 152 is provided with a plurality of through holes 152a. The plurality of through holes 152a penetrate the stripper 152 in the vertical direction. As shown in FIG. 4, the plurality of through holes 152a are arranged so as to surround the periphery of the through holes E2. Out of the plurality of through holes 152a, the outlets provided on the lower surface (the surface facing the die plate 143) each overlap with the plurality of tooth portions W2 formed on the metal plate MS when viewed from above. positioned.

As shown in FIG. 3, the punches P1 to P3 are arranged so as to be arranged in this order from the upstream side to the downstream side of the press working apparatus 130. The lower end of the punch P1 has a shape corresponding to the die hole D1a. The lower end of the punch P2 has a shape corresponding to the die hole D2a. The lower end of the punch P3 has a shape corresponding to the die hole D3a.

The press machine 160 is configured to move the upper die 150 up and down. The press machine 160 includes a crankshaft 161, a fixing member 162, a connecting member 163, and a drive mechanism 164. The crankshaft 161 includes a main shaft (crank journal), an eccentric shaft (crank pin) located eccentrically from the main shaft, and a connecting member (crank arm) connecting them.

The fixing member 162 is fixed to a fixing wall or the like, and is configured to rotatably hold the main shaft of the crankshaft 161. The connecting member 163 connects the crankshaft 161 and the punch holder 151. The eccentric shaft of the crankshaft 161 is rotatably connected to the upper end of the connecting member 163. A punch holder 151 is connected to the lower end of the connecting member 163 via a rotating shaft (not shown).

The drive mechanism 164 is connected to the main shaft of the crankshaft 161 via, for example, a flywheel, a gearbox, or the like (not shown). The drive mechanism 164 operates based on the instruction signal from the controller Ctr to rotate the main shaft of the crankshaft 161. When the main shaft of the crankshaft 161 rotates, the eccentric shaft makes a circular motion around the main shaft. Along with this, the punch holder 151 reciprocates up and down between the top dead center and the bottom dead center.

The suction device 170 is configured to operate based on an instruction signal from the controller Ctr. As shown in FIG. 5, the suction device 170 is configured to generate a suction air flow (negative pressure) around the outlet of the through hole 152a through the through hole 152a to suck the teeth portion W2 upward. There is. The suction device 170 may be set so as to generate a suction force on the teeth portion W2 to the extent that the teeth portion W2 is not plastically deformed. The magnitude of the suction force generated in the teeth portion W2 by the suction device 170 may be appropriately set according to the thickness of the metal plate MS, the material of the metal plate MS, the shape of the teeth portion W2, and the like. The suction device 170 may be, for example, an intake pump.

[Manufacturing method of stator laminated iron core]
Subsequently, a method for manufacturing the stator laminated iron core 10 will be described with reference to FIG. In the following description, the controller Ctr controls the suction device 170 so that the suction device 170 always operates during the production of the stator laminated iron core 10.

When the metal plate MS is intermittently sent to the press processing device 130 by the delivery device 120 and the predetermined portion of the metal plate MS reaches the die D1, the press machine 160 operates to direct the upper die 150 toward the lower die 140. Push down. When the stripper 152 reaches the metal plate MS and the metal plate MS is sandwiched between the stripper 152 and the die plate 143, the sandwiching of the metal plate MS by the pair of rollers 121 and 122 is released. At this time, since the lift pin 145a is pushed down by the stripper 152, substantially the entire lift pin 145a is accommodated in the insertion hole 143a.

After that, the press machine 160 continuously pushes the upper mold 150 downward. At this time, the stripper 152 does not move, but the punch holder 151 and the punches P1 to P3 continue to descend. Therefore, the tip of the punch P1 moves downward in the through hole E1 of the stripper 152 and further reaches the die hole D1a. In this step, the punch P1 punches the metal plate MS along the die hole D1a. As a result, a plurality of spaces W3 are formed on the metal plate MS. The punched waste material is discharged from the discharge hole C1. After that, the pair of rollers 121 and 122 sandwich the metal plate MS again, and as the press machine 160 operates, the punch holder 151 rises to the top dead center so that the stripper 152 is separated from the metal plate MS.

Next, when the metal plate MS is intermittently sent out by the delivery device 120 and the predetermined portion of the metal plate MS reaches the die D2, the press machine 160 operates to move the upper die 150 downward toward the lower die 140. Extrude. When the stripper 152 reaches the metal plate MS and the metal plate MS is sandwiched between the stripper 152 and the die plate 143, the sandwiching of the metal plate MS by the pair of rollers 121 and 122 is released. At this time, as shown in FIG. 6A, since the lift pin 145a is pushed down by the stripper 152, substantially the entire lift pin 145a is accommodated in the insertion hole 143a.

After that, the press machine 160 continuously pushes the upper mold 150 downward. At this time, the stripper 152 does not move, but the punch holder 151 and the punches P1 to P3 continue to descend. Therefore, the tip of the punch P2 moves downward in the through hole E2 of the stripper 152 and further reaches the die hole D2a. In this process, the punch P2 punches the metal plate MS along the die hole D2a. As a result, through holes Wa communicating with the plurality of spaces W3 formed in the previous step are formed in the metal plate MS. As a result, the teeth portion W2, which is a cantilever-shaped plate piece, is formed between the spaces W3 adjacent to each other in the circumferential direction of the through hole Wa. The punched waste material is discharged from the discharge hole C2.

As shown in FIG. 6A, when the metal plate MS is sandwiched between the stripper 152 and the die plate 143, the outlets of the plurality of through holes 152a are in contact with or close to the corresponding teeth portions W2, respectively. do. Since the suction device 170 forms a suction airflow (negative pressure) around the outlet of the through hole 152a, the suction airflow (negative pressure) is also formed around the teeth portion W2 that is in contact with or is close to the outlet of the through hole 152a. ) Is formed. Therefore, each tooth portion W2 is sucked upward by the corresponding through hole 152a.

After that, the pair of rollers 121 and 122 sandwich the metal plate MS again, and as the press machine 160 operates, the punch holder 151 rises to the top dead center so that the stripper 152 is separated from the metal plate MS. At this time, as shown in FIG. 6B, the lift pin 145a raises the entire metal plate MS by the urging force of the urging member 145b, and each tooth portion W2 is attracted to the corresponding through hole 152a.

Next, when the metal plate MS is intermittently delivered by the delivery device 120, the suction force acting on the teeth portion W2 decreases as the distance from the through hole 152a increases. Therefore, the tip of each tooth portion W2 gradually descends from the state of being curved upward. The delivery device 120 sends the metal plate MS to the downstream side so that the teeth portion W2 passes through the die hole D2a before the hanging of each teeth portion W2 becomes large. The time from the start of ascending of the upper die 150 to the completion of intermittent delivery of the metal plate MS by the sending device may be, for example, about 0.1 seconds to 0.5 seconds, or 0. It may be shorter than 1 second.

Next, when the predetermined portion of the metal plate MS reaches the die D2, the upper die 150 is moved up and down by the press machine 160, and the metal plate MS is punched by the punch P3 in the same manner as described above. As a result, as shown in FIG. 4, the punching member W is punched out from the metal plate MS. A through hole R having a shape corresponding to the outer shape of the punched member W is formed in the metal plate MS after the punched member W is punched.

The punched member W is coupled to the punched member W punched in advance while being laminated in the die hole D3a. When a predetermined number of punching members W are laminated in the die hole D3a, the stator laminated iron core 10 is completed. The stator laminated iron core 10 is sent out to a subsequent device of the press working device 130 through the discharge hole C3 and the transfer device 146.

[Action]
According to the above example, after the punching process to the metal plate MS, the teeth portion W2, which is a cantilevered portion of the metal plate MS, is sucked upward, so that the downward sagging of the teeth portion W2 is suppressed. In this state, the metal plate MS is conveyed. Therefore, even if the amount of rise of the metal plate MS by the lifter 145 is not large, it is possible to accelerate the timing of starting the transfer of the metal plate MS while avoiding the collision of the teeth portion W2 with the die D2. Therefore, the processing speed of the metal plate MS can be further increased. As a result, it is possible to improve the productivity of the stator laminated iron core 10.

According to the above example, the teeth portion W2 is sucked upward by the suction airflow formed by the suction device 170 around the teeth portion W2. Therefore, it is possible to realize suction of the teeth portion W2 with a relatively inexpensive and simple configuration.

By the way, the teeth portion W2 can protrude from the upstream side to the downstream side in the transport direction of the metal plate MS. When the teeth portion W2 hangs down, the teeth portion W2 tends to collide with the die D2 (inner peripheral surface of the die hole D2a) and easily deform when the metal plate MS is conveyed. However, according to the above example, since the teeth portion W2 is sucked upward, it is possible to accelerate the timing of starting the transfer of the metal plate MS while avoiding the collision of the teeth portion W2 with the die D2.

According to the above example, a suction force to the extent that the teeth portion W2 is not plastically deformed can act on the teeth portion W2. In this case, since the tooth portion W2 is sucked upward within the range of elastic deformation, excessive deformation of the punching member W is suppressed. Therefore, it is possible to obtain the stator laminated iron core 10 having good characteristics.

According to the above example, the teeth portion W2 can be continuously sucked by the through hole 152a at least until the stripper 152 rises from the bottom dead center to the top dead center. In this case, since fine control of suction start and suction stop is not required, the stator laminated iron core 10 can be manufactured more efficiently.

[Modification example]
The disclosure herein should be considered exemplary in all respects and not restrictive. Various omissions, substitutions, changes, etc. may be made to the above examples within the scope of the claims and the gist thereof.

(1) During the production of the stator laminated iron core 10, the suction device 170 may always perform intake through the through hole 152a, or at least until the stripper 152 rises from the bottom dead center to the top dead center. During that time, intake air may be performed through the through hole 152a. The metal plate MS can suppress the hanging down by sucking the portion having the shape at least after the punching process in which the shape in which the metal plate MS is likely to hang down is formed.

(2) The suction device 170 may also suck the portion of the metal plate MS other than the teeth portion W2. In this case, the lifter 145 can be omitted from the press working apparatus 130 by setting the suction force acting on the metal plate MS to such a size that the metal plate MS can float in the air.

(3) The shape of the through hole 152a can be changed. As an example, the hole diameter of the outlet (the end provided on the surface facing the die plate 143) may be larger (or smaller) than the hole diameter of the inlet (the end on the suction device 170 side) of the through hole 152a. .. Further, a groove for increasing the suction area may be formed at the outlet of the through hole 152a. Further, instead of providing the plurality of through holes 152a individually, the shape of the through holes 152a is changed so that outlets (ends provided on the surface facing the die plate 143) of the plurality of through holes 152a are provided. You may. As an example of changing the shape of the through hole 152a, a horizontal hole for communicating the adjacent through holes 152a may be provided. When the configuration corresponds to a horizontal hole or the like in which a plurality of through holes 152a communicate with each other, the number of outlets of the through holes 152a can be increased with respect to the number of inlets connected to the suction device 170. Further, even in such a case, the suction device 170 makes it possible to generate a suction airflow (negative pressure) around the outlets of the plurality of through holes 152a. Therefore, the number of pipes connecting the suction device 170 and the through hole 152a can be reduced, and the configuration of the press working device can be simplified and the cost can be reduced. In addition, in order to provide the through hole 152a, another member may be combined with the stripper 152 main body.

(4) The suction device 170 may suck the teeth portion W2 by means other than suction. The suction device 170 may be, for example, a magnet (for example, a permanent magnet or an electromagnet). In this case, the suction device 170 may be embedded in the stripper 152 so that the magnetic force acts on the metal plate MS. The suction device 170 may be, for example, a suction cup.

(5) If a cantilever portion is generated in the manufacturing process, use a laminated iron core other than the stator laminated iron core 10 (for example, a rotor laminated iron core) or a metal product other than the laminated iron core (for example, a lead frame). At the time of manufacturing, the manufacturing apparatus 100 described above may be used.

FIG. 7 shows an example of a rotor laminated iron core including a cantilevered portion. The rotor laminated iron core 20 illustrated in FIG. 7 has a cylindrical shape. That is, a central hole 20a (through hole) extending through the rotor laminated iron core 20 along the central axis Ax is provided in the central portion of the rotor laminated iron core 20. A shaft can be arranged in the center hole 20a.

A plurality of magnet insertion holes 21 extending through the rotor laminated iron core 20 along the central axis Ax are provided around the central hole 20a of the rotor laminated iron core 20. The magnet insertion hole 21 includes a first portion 21a, a second portion 21b, and a third portion 21c. The first portion 21a extends in the vicinity of the central hole 20a. The second portion 21b extends continuously from one end of the first portion 21a toward the outer peripheral surface of the rotor laminated iron core 20 along the radial direction of the rotor laminated iron core 20. The third portion 21c extends continuously from the other end of the first portion 21a toward the outer peripheral surface of the rotor laminated iron core 20 along the radial direction of the rotor laminated iron core 20. Therefore, the magnet insertion hole 21 has a substantially C shape when viewed from above. The rotor laminated iron core 20 includes an island-shaped portion T surrounded by each magnet insertion hole 21 and an outer peripheral surface of the rotor laminated iron core 20.

At least one permanent magnet 22 is arranged in the first portion 21a of the magnet insertion hole 21. A solidifying resin 23 is provided in the magnet insertion hole 21 after the permanent magnet 22 is inserted. The solidified resin 23 is configured to fix the permanent magnet 22 in the magnet insertion hole 21. The solidified resin 23 is configured to join the punching members W adjacent to each other in the vertical direction.

The rotor laminated iron core 20 is a laminated body in which a plurality of punched members W (punched members) are stacked. The stacking direction of the plurality of punched members W is also the extending direction of the central axis Ax. The shape of the punched member W seen from above is substantially the same as the shape of the rotor laminated iron core 20 seen from above. Therefore, the punching member W includes an island-shaped portion Wt (cantilever-shaped portion) corresponding to the island-shaped portion T. The island-shaped portion Wt is a cantilever-shaped plate piece that protrudes from the outer peripheral edge of the punching member W toward the central axis Ax.

(6) The manufacturing apparatus 100 may suck a portion different from the cantilevered portion of the metal plate MS upward. Further, even when the cantilevered portion is not formed in the manufacturing process, the above-mentioned manufacturing apparatus 100 may be used when manufacturing the metal product.

FIG. 8 shows an example of the layout in the metal plate MS. In the metal plate MS illustrated in FIG. 8, a punching member W having a shape corresponding to the punching shape R1 and the punching shape R2 is formed. A plurality of punching members W are laminated, and the laminated body is bent by a processing machine (not shown) to become a stator laminated iron core. Therefore, the punched shape R1 has a yoke-corresponding region R1a corresponding to the yoke portion W1 and a plurality of teeth-corresponding regions R1b corresponding to the plurality of teeth portions W2. The yoke-corresponding region R1a extends in the width direction of the metal plate MS. The plurality of teeth-corresponding regions R1b are located downstream of the yoke-corresponding region R1a. Further, the punched shape R2 has a yoke-corresponding region R2a corresponding to the yoke portion W1 and a plurality of teeth-corresponding regions R2b corresponding to the plurality of teeth portions W2. The yoke-corresponding region R2a extends in the width direction of the metal plate MS. The plurality of teeth-corresponding regions R2b are located on the upstream side of the yoke-corresponding region R2a. At the position S17 where both the punched shapes R1 and R2 are formed on the metal plate MS, the plurality of teeth-corresponding regions R2b are located one by one between the plurality of teeth-corresponding regions R1b in the width direction of the metal plate MS. There is.

Positions S1 and S2 in FIG. 8 indicate positions where the punching member is punched from the metal plate MS. For example, at the position S1, a punching member having a shape corresponding to the punching shape R1 is punched out. Further, at the position S2, a punching member having a shape corresponding to the punching shape R2 is punched. Here, in the metal plate MS between the position S1 and the position S1 and the position S2 along the transport direction, the punched member having the shape corresponding to the punched shape R1 is punched out, resulting in a wide cantilever shape. A protrusion M1 can be formed. Further, on the downstream side of the position S2 and the position S2 along the transport direction, the punched member having a shape corresponding to the punched shape R2 is punched, and as a result, the width is narrower than that of the protruding portion M1 and the width of the metal plate MS. A meandering portion M2 extending so as to repeat a substantially S shape along the direction is formed. If the protruding portion M1 and the meandering portion M2 of the metal plate MS hang downward, they may interfere with the die or the like during transportation as in the teeth portion W2. On the other hand, the suction device 170 is configured to suck the protruding portion M1 or the meandering portion M2 upward after the protruding portion M1 or the meandering portion M2 is formed, thereby suppressing the downward hanging of the protruding portion M1 or the meandering portion M2. Can be done.

In this way, when a shape that tends to hang down from the metal plate MS is formed by the punching process, the portion having the shape is sucked upward by the suction device 170 after the punching process. It is possible to suppress downward sagging. Further, the position of the suction target of the metal plate MS by the suction device 170 is not limited to the portion to be the punching member. Therefore, a region different from the punched member may be sucked.

[Other examples]
Example 1. An example of a method for manufacturing a laminated iron core is a method of manufacturing a laminated iron core by laminating a plurality of punched members obtained by punching a strip-shaped metal plate intermittently along its longitudinal direction with a press working apparatus. It may be. An example of a method for manufacturing a laminated iron core is to suck the metal plate upward and after sucking the cantilevered portion at least after punching the metal plate by a press working apparatus, and then suck the metal plate in the longitudinal direction. It may include transporting along. In this case, the metal plate is sucked upward, so that the metal plate is conveyed in a state in which the metal plate is suppressed from hanging downward. Therefore, even if the amount of rise of the metal plate by the lifter or the like is not large, it is possible to accelerate the timing of starting the transportation of the metal plate while avoiding the collision of the metal plate with the die. Therefore, the processing speed of the metal plate can be further increased. As a result, it becomes possible to improve the productivity of the laminated iron core.

Example 2. In the method of Example 1, suction may include sucking the cantilevered portion formed on the metal plate upward. The cantilevered portion has a shape that easily hangs downward. On the other hand, since the cantilevered portion is sucked upward, the metal plate is conveyed in a state in which the cantilevered portion is suppressed from hanging downward. Therefore, even if the amount of rise of the metal plate by the lifter or the like is not large, it is possible to accelerate the timing of starting the transportation of the metal plate while avoiding the collision of the cantilevered portion with the die. Therefore, the processing speed of the metal plate can be further increased.

Example 3. In the method of Example 1 or Example 2, the cantilevered portion may protrude from the upstream side to the downstream side in the transport direction of the metal plate. If the cantilever portion as in Example 3 hangs down, the cantilever portion tends to collide with the die and easily deform when the metal plate is conveyed. However, since the cantilevered portion is sucked upward, even in the cantilevered portion as in Example 2, the timing of starting the transfer of the metal plate is accelerated while avoiding the collision of the cantilevered portion with the die. be able to.

Example 4. In the method of Example 2 or Example 3, the laminated iron core may be a stator laminated iron core, and the cantilevered portion may be a portion corresponding to the teeth of the stator laminated iron core.

Example 5. In the method of Example 1, suction may include sucking the metal plate upward after the punched member has been punched. The metal plate after the punched member is punched has a shape that easily hangs downward depending on the shape of the punched member. On the other hand, the metal plate after being punched is sucked upward, so that the metal plate is conveyed in a state where the downward sagging of the metal plate is suppressed. Therefore, even if the amount of rise of the metal plate by the lifter or the like is not large, it is possible to accelerate the timing of starting the transportation of the metal plate while avoiding the collision of the metal plate with the die.

Example 6. In any of the methods of Examples 1 to 5, sucking the metal plate may include generating a suction airflow around the suction target portion of the metal plate by the suction device. In this case, it is possible to realize suction of the suction target portion of the metal plate by a relatively inexpensive and simple configuration.

Example 7. In any of the methods of Examples 1 to 6, sucking the metal plate may include applying a force to the metal plate to such an extent that the metal plate is not plastically deformed. In this case, since the metal plate is sucked upward within the range of elastic deformation, excessive deformation of the punched member constituting the laminated iron core is suppressed. Therefore, it is possible to obtain a laminated iron core having good characteristics.

Example 8. In any of the methods of Examples 1 to 7, the suction of the metal plate is to continuously suck the metal plate at least until the stripper of the press working device rises from the bottom dead center to the top dead center. May include. In this case, since fine control of suction start and suction stop is not required, the laminated iron core can be manufactured more efficiently.

Example 9. An example of a laminated iron core manufacturing device is a delivery device configured to intermittently convey a strip-shaped metal plate along its longitudinal direction, and a plurality of punched members punched out from the metal plate and laminated. It may be equipped with a press working apparatus configured to manufacture an iron core. An example of a laminated iron core manufacturing apparatus may further include a suction device configured to suck the metal plate upward after at least punching the metal plate by a press working device, and a control unit. .. The control unit may be configured to perform a process of transporting the metal plate along the longitudinal direction by the delivery device after the suction device sucks the metal plate. In this case, the same effect as the method of Example 1 can be obtained.

10 ... Stator laminated iron core (laminated iron core), 12 ... Teeth, 100 ... Manufacturing equipment, 120 ... Sending equipment, 130 ... Pressing equipment, 143 ... Die plate, 152 ... Stripper, 170 ... Suction equipment, Ctr ... Controller (control) Part), MS ... Metal plate, W ... Punched member, W2 ... Teeth part (cantilever part), Wt ... Island-like part (cantilever part).

Claims (9)

It is a method of manufacturing a laminated iron core by laminating a plurality of punched members obtained by punching a strip-shaped metal plate intermittently along its longitudinal direction with a press working apparatus.
At least after punching the metal plate by the press working apparatus, the metal plate is sucked upward.
A method for manufacturing a laminated iron core, which comprises transporting the metal plate along the longitudinal direction after the suction. The method according to claim 1, wherein the suction includes sucking the cantilevered portion formed on the metal plate upward. The method according to claim 2, wherein the cantilevered portion projects from the upstream side to the downstream side in the transport direction of the metal plate. The laminated iron core is a stator laminated iron core, and is
The method according to claim 2 or 3, wherein the cantilevered portion is a portion corresponding to the teeth of the stator laminated iron core. The method according to claim 1, wherein the suction includes sucking the metal plate upward after the punched member is punched. The method according to any one of claims 1 to 5, wherein the suction includes generating a suction airflow around a portion of the metal plate to be sucked by a suction device. The method according to any one of claims 1 to 6, wherein the suction includes applying a force to the metal plate to such an extent that the metal plate is not plastically deformed. Any one of claims 1 to 7, wherein the suction includes continuously sucking the metal plate at least until the stripper of the press working apparatus rises from the bottom dead center to the top dead center. The method described in the section. A delivery device configured to intermittently transport a strip of metal plate along its longitudinal direction,
A press working apparatus configured to manufacture a laminated iron core by punching and laminating a plurality of punching members from the metal plate.
A suction device configured to suck the metal plate upward after at least punching the metal plate by the press working device.
Equipped with a control unit
The control unit is a device for manufacturing a laminated iron core, which is configured to execute a process of sucking the metal plate by the suction device and then transporting the metal plate along the longitudinal direction by the delivery device.

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