JP2017169306A - Manufacturing apparatus of laminate iron core and manufacturing method of laminate iron core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of burrs in a low cost.SOLUTION: A manufacturing method of a laminate iron core, includes a first step of: transmitting a first processed portion of a band-shaped metal plate to a first punch part having a first die to which a first die hole is arranged, and a first punch arranged so as to be opposite to the first die hole; transmitting the first processed portion of the metal plate to a second punch part having a second die to which a second die hole having a size and a shape almost equal to that of the first die hole is arranged, and a second punch arranged so as to be opposite to the second die hole after the metal plate is punched by inserting the first punch into the first die hole, and a penetration hole is formed on the metal plate; and inserting, in the penetration hole, only a tip part that is extended from a main body part of the second punch through a step part, and has an external diameter smaller than that of the main body part and the second die hole.SELECTED DRAWING: Figure 6

Description

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

  Patent Documents 1 and 2 disclose that a coil material, which is a strip-shaped metal plate (processed plate) wound in a coil shape, is intermittently and sequentially sent out from an uncoiler at a predetermined pitch, and a through-hole or A first step of forming caulking, a second step of punching a metal plate with a punch to form a punching member having a through hole or caulking, and a plurality of punching members being stacked through the through hole and caulking The manufacturing method of the laminated core including the 3rd process of fastening a some punching member and forming a laminated core is disclosed.

  The caulking is composed of a recess formed on the front surface side of the punching member and a protrusion formed on the back surface side of the punching member. A caulking protrusion of another punching member is fitted into a caulking recess of one punching member. The through-hole is fitted with a caulking projection of a punching member adjacent to the lowermost layer of the laminated core. The through-hole has a function of preventing the laminated body to be manufactured next from being fastened by caulking when the laminated body is continuously manufactured.

JP 2008-182793 A JP 2007-014122 A

  By the way, in the first step, when the through hole forming process for forming the through hole in the metal plate is executed, the through hole forming process is performed when the processed portion of the metal plate reaches the through hole forming position. The metal plate is punched into a predetermined shape (for example, a circular shape) by the punch, and when the metal plate is fed forward and the processed portion of the metal plate reaches the crimping position, the crimping punch is inserted into the through hole. On the other hand, in the first step, when the caulking forming process for forming caulking on the metal plate is executed, the position of the through hole forming punch is changed so that the through hole forming punch does not reach the metal plate. Change according to the mechanism. In this state, when the processed portion of the metal plate reaches the through hole forming position, the metal plate is not processed by the through hole forming punch, and the metal plate is fed forward so that the processed portion of the metal plate reaches the crimp forming position. Then, the caulking is formed on the metal plate by the caulking forming punch.

  In general, the size and shape of the through hole forming punch and the caulking forming punch are the same. Therefore, if an error occurs in the punching accuracy of the through hole by the punch for forming the through hole, an error occurs in the feeding accuracy of the coil material, or vibration occurs in the caulking punch during the operation of the caulking punch, the through hole When the caulking punch is inserted into the through hole in the forming process, the caulking forming punch may rub against the inner wall of the through hole to cause burrs in the through hole. When a motor is configured using a laminated core having such burrs, vibrations, centrifugal force, etc. act on the burrs as the motor operates, and the burrs may fall off. Therefore, there is a possibility that the burr collides with the components of the motor to generate abnormal noise from the motor or affect the characteristics of the motor.

  Therefore, in Patent Document 1, even when the through hole forming process is executed, the position of the caulking forming punch is changed by the position changing mechanism so that the caulking forming punch does not reach the metal plate. In this state, when the part to be processed of the metal plate reaches the through-hole forming position, the metal plate is punched into a predetermined shape (for example, circular shape) by the through-hole forming punch, and the metal plate is fed forward so When the processing part reaches the crimping position, the metal plate is not processed by the crimping punch. As a result, the caulking punch is not inserted into the through-hole during the through-hole forming process, so that the generation of burrs can be prevented. However, since a position changing mechanism for the caulking forming punch is required in addition to the position changing mechanism for the through hole forming punch, the apparatus becomes large and complicated, and there is a concern about an increase in cost.

  On the other hand, in Patent Document 2, the size of the through hole forming punch is set smaller than that of the caulking forming punch, and the through hole is intentionally deformed greatly by the caulking forming punch during the through hole forming process to generate large burrs. ing. Thereby, since a big burr | flash is connected with a through-hole in the wide area | region in a through-hole, it becomes possible to hold | maintain a big burr | flash in a through-hole. However, when the motor is configured using the laminated iron core disclosed in Patent Document 2, since the burr is large, vibration, centrifugal force, etc. are more likely to act on the burr with the operation of the motor, and the burr may drop off.

  The present disclosure describes a manufacturing apparatus and a manufacturing method of a laminated iron core that can suppress generation of burrs at low cost.

  An apparatus for manufacturing a laminated core according to one aspect of the present disclosure includes a delivery unit configured to intermittently sequentially feed a strip-shaped metal plate, a first die provided with a first die hole, and A first punch portion having a first punch disposed so as to face the first die hole; a first state in which the first punch portion can perform a punching operation of a metal plate; and a first punch portion. Is substantially the same size as the first die hole, and the state changing portion configured to be able to selectively change the state of the first punch portion between the second state where the metal plate cannot be punched. And a second die having a second die hole having a shape, a second punch portion having a second punch disposed so as to face the second die hole, and the first and second A drive unit for driving the two punch units, and a control unit. The second punch includes a main body portion and a tip portion that extends from the main body portion through the step portion and has a smaller outer shape than the main body portion and the second die hole. The control unit controls the state changing unit to set the first punch unit to the first state, and controls the feeding unit and the driving unit to set the first processed portion of the metal plate to the first position by the feeding unit. After reaching the punch part and inserting the first punch into the first die hole by the driving part to punch out the metal plate to form a through hole in the metal plate, the first part of the metal plate is made by the sending part. A first process of causing the workpiece to reach the second punch portion and inserting only the tip end portion of the second punch into the through hole by the driving portion, and the state changing portion to control the first punch portion In the second state, the feeding unit and the driving unit are controlled so that the second part to be processed of the metal plate reaches the first punch unit by the feeding unit, and the first punch unit is moved by the driving unit. Drive, but do not bring the first punch into contact with the metal plate, and then the second workpiece of the metal plate by the delivery unit An uneven portion is formed in the metal plate by causing the driving portion to reach the second punch portion, pressing only the tip of the second punch against the metal plate by the driving portion, and pushing the metal plate into the second die hole. The second process is executed.

  In the laminated core manufacturing apparatus according to one aspect of the present disclosure, the second punch includes a tip portion that extends from the main body portion through the step portion and has a smaller outer shape than the main body portion and the second die hole. Therefore, even when an error occurs in the punching accuracy of the through hole by the first punch portion, an error occurs in the feeding accuracy of the metal plate, or vibration occurs in the second punch during the operation of the second punch, When the control unit controls the driving unit in the first process and the driving unit inserts only the tip of the second punch into the through hole, the tip of the second punch is in contact with the through hole. It is hard to do. Therefore, it is possible to suppress the generation of burrs at a low cost by an extremely simple method of providing a step portion between the tip portion of the second punch and the main body portion. Even in this case, since the shapes and sizes of the first and second die holes are substantially the same, the protrusions of the concavo-convex portions formed on the metal plate by the second punch portions are the first punch portions. Can be fitted into a through hole formed in the metal plate.

  The width of the stepped portion may be 1 μm to 10 μm. If the width of the stepped portion is 1 μm or more, the tip portion of the second punch is less likely to come into contact with the through hole, so that the generation of burrs can be further suppressed. When the width of the stepped portion is 10 μm or less, the protrusion of one uneven portion formed on the metal plate by the second punch portion, and the depression of the other uneven portion formed on the metal plate by the second punch portion When this is fitted, the depression does not have to be too small with respect to the protrusion. Therefore, since it is possible to fit these protrusions without forcibly press-fitting the protrusions into the depressions, it is possible to suppress the deformation of the metal plates during the fitting, and the metal plates adjacent in the stacking direction. It is possible to suppress a gap generated between them.

  The step portion may be provided over the entire circumference of the second punch.

  The step portion may be partially provided on the second punch.

  A method for manufacturing a laminated core according to one aspect of the present disclosure includes a first die provided with a first die hole, and a first punch disposed so as to face the first die hole. The first processed portion of the belt-shaped metal plate is sent to the first punch portion, and the first punch is inserted into the first die hole so that the metal plate is punched and a through hole is formed in the metal plate. After the formation, the second die hole provided with the second die hole having a size and shape substantially equal to the first die hole, and the second die hole disposed so as to face the second die hole The first processed portion of the metal plate is sent to the second punch portion having two punches, and extends from the main body portion of the second punch through the step portion, and from the main body portion and the second die hole. A first step of inserting only the tip portion having a small outer diameter into the through hole, and a second processed portion of the metal plate as the first pattern. The metal plate is not punched by the first punch portion, and then the second processed portion of the metal plate is sent to the second punch portion, and the tip of the second punch A second step of pressing the metal plate against the metal plate and extruding the metal plate into the second die hole to form an uneven portion on the metal plate.

  In the method for manufacturing a laminated core according to one aspect of the present disclosure, the second punch includes a tip portion that extends from the main body portion through the step portion and has a smaller outer shape than the main body portion and the second die hole. Therefore, even when an error occurs in the punching accuracy of the through hole by the first punch portion, an error occurs in the feeding accuracy of the metal plate, or vibration occurs in the second punch during the operation of the second punch, When only the tip of the second punch is inserted into the through hole in the first step, the tip of the second punch is extremely difficult to contact the through hole. Therefore, it is possible to suppress the generation of burrs at a low cost by an extremely simple method of providing a step portion between the tip portion of the second punch and the main body portion. Even in this case, since the shapes and sizes of the first and second die holes are substantially the same, the protrusions of the concavo-convex portions formed on the metal plate by the second punch portions are the first punch portions. Can be fitted into a through hole formed in the metal plate.

  The width of the stepped portion may be 1 μm to 10 μm. If the width of the stepped portion is 1 μm or more, the tip portion of the second punch is less likely to come into contact with the through hole, so that the generation of burrs can be further suppressed. When the width of the stepped portion is 10 μm or less, the protrusion of one uneven portion formed on the metal plate by the second punch portion, and the depression of the other uneven portion formed on the metal plate by the second punch portion When this is fitted, the depression does not have to be too small with respect to the protrusion. Therefore, since it is possible to fit these protrusions without forcibly press-fitting the protrusions into the depressions, it is possible to suppress the deformation of the metal plates during the fitting, and the metal plates adjacent in the stacking direction. It is possible to suppress a gap generated between them.

  The step portion may be provided over the entire circumference of the second punch.

  The step portion may be partially provided on the second punch.

  According to the manufacturing apparatus and the manufacturing method of the laminated iron core according to the present disclosure, it is possible to suppress the generation of burrs at a low cost.

FIG. 1 is a perspective view showing an example of a stator laminated iron core. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic diagram illustrating an example of a laminated iron core manufacturing apparatus. FIG. 4 is a schematic view showing an example of a punching device. FIG. 5 is a cross-sectional view schematically showing a mechanism for stacking the punching members and a mechanism for discharging the stator laminated core from the die plate. FIG. 6 is a perspective view showing an example of a caulking punch. FIG. 7 is a diagram illustrating an example of a punching layout. FIG. 8 is a diagram for explaining the through-hole forming process. FIG. 9 is a diagram for explaining the caulking process. FIG. 10A is a diagram for explaining the generation of burrs, and FIG. 10B is an enlarged cross-sectional view showing a part of a laminated core on which punching members having burrs are laminated. FIG. 11 is a perspective view showing another example of a caulking punch.

  Since the embodiment according to the present disclosure described below is an example for explaining the present invention, the present invention should not be limited to the following contents. In the following description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

[Stator laminated core]
First, with reference to FIG.1 and FIG.2, the structure of the stator laminated core 1 is demonstrated. The stator laminated iron core 1 (stator) has a cylindrical shape. That is, a through hole 1 a extending along the central axis Ax is provided in the central portion of the stator laminated core 1. A rotor core (rotor) (not shown) can be disposed in the through hole 1a. The stator laminated core 1 constitutes an electric motor (motor) together with the rotor core.

  The stator laminated core 1 is a laminated body in which a plurality of punching members 10 (see FIG. 5, which will be described in detail later) are stacked. The stator laminated iron core 1 has a yoke portion 2 and a plurality of teeth portions 3 (six teeth portions 3 in FIG. 1).

  The yoke part 2 has an annular shape and extends so as to surround the central axis Ax. The width in the radial direction of the yoke portion 2 can be various sizes depending on the use and performance of the motor, but may be, for example, about 2 mm to 40 mm.

  Each tooth portion 3 extends along the radial direction of the stator laminated core 1 so as to go from the inner edge of the yoke portion 2 toward the central axis Ax. In the stator laminated core 1 shown in FIG. 1, each tooth portion 3 is integrally formed with the yoke portion 2.

  The teeth portions 3 are arranged at substantially equal intervals in the circumferential direction of the stator laminated core 1. When the stator laminated iron core 1 is configured as a motor, a winding (not shown) is wound around each tooth portion 3 a predetermined number of times. Between adjacent teeth 3, a slot 4 is defined as a space for arranging windings.

  Each teeth part 3 is provided with a caulking part 5. As shown in FIG. 2, the caulking portion 5 includes a through hole 5 a formed in the punching member 10 that forms the lowermost layer of the stator laminated core 1 and a punching member 10 that forms other than the lowermost layer of the stator laminated iron core 1. It has the caulking 5b (uneven part) formed. The caulking 5 b includes a recess (concave portion) formed on the front surface side of the punching member 10 and a protrusion (convex portion) formed on the back surface side of the punching member 10. The depression of the caulking 5b of one punching member 10 is joined to the protrusion of the caulking 5b of another punching member 10 located on the surface side of the one punching member 10. The protrusion of the caulking 5b of one punching member 10 is joined to the depression of the caulking 5b of another punching member 10 located on the back side of the one punching member 10. A protrusion of the caulking 5b of the punching member 10 adjacent to the lowermost layer of the stator laminated core 1 is joined to the through hole 5a. The through-hole 5a has a function of preventing the stator laminated core 1 to be manufactured next from being fastened by the caulking 5b to the already produced stator laminated core 1 when the stator laminated core 1 is continuously manufactured. Have

[Stator laminated iron core manufacturing equipment]
Then, with reference to FIG. 3, the manufacturing apparatus 100 of the stator laminated core 1 is demonstrated. The manufacturing apparatus 100 is an apparatus for manufacturing the stator laminated core 1 from the electromagnetic steel plate W (working plate) which is a strip-shaped metal plate. The manufacturing apparatus 100 includes an uncoiler 110, a delivery device 120 (a delivery unit), a punching device 130, and a controller 150 (a control unit).

  The uncoiler 110 rotatably holds the coil material 11 in a state in which the coil material 111 which is a strip-shaped electromagnetic steel sheet W wound in a coil shape is mounted. The feeding device 120 includes a pair of rollers 121 and 122 that sandwich the electromagnetic steel sheet W from above and below. The pair of rollers 121 and 122 rotate and stop based on an instruction signal from the controller 150, and intermittently sequentially feed the electromagnetic steel sheet W toward the punching device 130.

  The length of the electromagnetic steel plate W constituting the coil material 111 may be, for example, about 500 m to 10000 m. The thickness of the electromagnetic steel sheet W may be, for example, about 0.1 mm to 0.5 mm. The thickness of the electromagnetic steel plate W may be, for example, about 0.1 mm to 0.3 mm from the viewpoint of obtaining the stator laminated core 1 having more excellent magnetic characteristics. The width of the electromagnetic steel sheet W may be, for example, about 50 mm to 500 mm.

  The controller 150 generates and sends instruction signals for operating the sending device 120 and the punching device 130 based on, for example, a program recorded on a recording medium (not shown) or an operation input from the operator. Transmit to the device 120 and the punching device 130.

[Punching device]
Next, the punching device 130 will be described with reference to FIGS. The punching device 130 is formed by punching the magnetic steel sheets W intermittently delivered by the delivery device 120 to form the punching member 10 and the stacking members 10 obtained by the punching are stacked and fixed in order. And a function of manufacturing the child laminated core 1.

  3 and 4, the punching device 130 includes a base 131, a lower die 132, a die plate 133, a stripper 134, an upper die 135, a top plate 136, and a press machine 137 (drive unit). And a hanger 138, a switching mechanism 140 (state changing portion), punches A1 to A6, and pressing pins B1 to B6. The base 131 supports the lower mold 132 placed on the base 131.

  The lower mold 132 holds the die plate 133 placed on the lower mold 132. The lower mold 132 is provided with discharge holes C1 to C6 through which materials punched from the electromagnetic steel sheet W (for example, the punching member 10, waste materials, etc.) are discharged, at positions corresponding to the punches A1 to A6. As shown in FIG. 5, a cylinder 132a, a stage 132b, and a pusher 132c are arranged in the discharge hole C6.

  The cylinder 132a supports the punching member 10 in order to prevent the punching member 10 punched from the electromagnetic steel sheet W by the punch A6 from falling downward. The cylinder 132a is configured to be movable in the vertical direction based on an instruction signal from the controller 150. Specifically, the cylinder 132a intermittently moves downward every time the punching member 10 is stacked on the cylinder 132a. When a predetermined number of punching members 10 are stacked on the cylinder 132a and the stator laminated core 1 is formed, the cylinder 132a moves to a position where the surface of the cylinder 132a is flush with the surface of the stage 132b.

  The stage 132b is provided with a hole through which the cylinder 132a can pass. The pusher 132c is configured to be movable in the horizontal direction on the surface of the stage 132b based on an instruction signal from the controller 150. With the cylinder 132a moved to a position where the surface of the cylinder 132a is flush with the surface of the stage 132b, the pusher 132c pays out the stator laminated core 1 from the cylinder 132a to the stage 132b. The stator laminated iron core 1 delivered to the stage 132b is transported outside the manufacturing apparatus 100.

  Returning to FIG. 4, the die plate 133 has a function of forming the punching member 10 together with the punches A1 to A6. The die plate 133 is provided with dies D1 to D6 at positions corresponding to the punches A1 to A6, respectively. Each of the dies D1 to D6 is provided with through holes D1a to D6a (die holes) that extend in the vertical direction and communicate with the corresponding discharge holes C1 to C9. The diameter of each of the through holes D1a to D6a is such that the tip of the corresponding punch A1 to A6 can be inserted and is slightly smaller than the tip. The shapes and sizes of the through holes D3a and D4a are substantially the same. The die plate 133 is provided with insertion holes E1 to E6 at positions corresponding to the pressing pins B1 to B6.

  The stripper 134 includes a stripper plate 134a and a holding plate 134b. The stripper plate 134a has a function of removing, from the punches A1 to A6, the electromagnetic steel sheet W that has bitten into the punches A1 to A6 when the electromagnetic steel sheet W is punched with the punches A1 to A6. The stripper plate 134 a is located above the die plate 133. The holding plate 134b holds the stripper plate 134a from above.

  The stripper 134 is provided with through holes F1 to F6 at positions corresponding to the punches A1 to A6. Each of the through holes F1 to F6 extends in the vertical direction, and communicates with the corresponding through holes D1a to D6a of the dies D1 to D6 when the stripper plate 134a contacts the die plate 133. The lower portions of the punches A1 to A6 are inserted into the through holes F1 to F6, respectively. The lower portions of the punches A1 to A6 can slide in the through holes F1 to F6, respectively.

  The stripper 134 is provided with through holes F7 to F12 at positions corresponding to the pressing pins B1 to B6. Each of the through holes F7 to F12 extends in the vertical direction and communicates with the corresponding insertion holes E1 to E6 when the stripper plate 134a contacts the die plate 133. The lower portions of the pressing pins B1 to B6 are inserted into the through holes F7 to F12, respectively. The lower portions of the pressing pins B1 to B6 are slidable in the through holes F7 to F12, respectively.

  The upper mold 135 is located above the stripper 134. To the upper die 135, the bases (upper portions) of the punches A1, A2, A4 to A6 and the pressing pins B1 to B6 are fixed. The upper die 135 holds the base (upper part) of the punch A3 so that the punch A3 can slide up and down. Therefore, the upper mold 135 holds the punches A1 to A6 and the pressing pins B1 to B6.

  The upper mold 135 has an end portion on the upstream side and a downstream side of the punching device 130, which is located on the top plate 136 side and extends in the vertical direction, and a penetration that penetrates downward from the accommodation space 135 a. A hole 135b is provided. Above the punch A3 of the upper die 135, there is an accommodation space 135c that is located on the top plate 136 side and extends in the horizontal direction, and a through-hole 135d that penetrates downward from the accommodation space (toward the base of the punch A3). And are provided.

  The top plate 136 is located above the upper mold 135. The top plate 136 holds the upper mold 135. The press machine 137 is located above the top plate 136. The piston of the press machine 137 is connected to the top plate 136 and operates based on an instruction signal from the controller 150. When the press machine 137 is operated, the piston expands and contracts, and the stripper 134, the upper die 135, the top plate 136, the hanger 138, the switching mechanism 140, the punches A1 to A6 and the pressing pins B1 to B6 (hereinafter, these are referred to as the movable portion 160). ) Moves up and down as a whole.

  The hanger 138 suspends the stripper 134 from the upper mold 135 and holds it. The hanger 138 has a long rod portion 138a and a head portion 138b provided at the upper end of the rod portion 138a. The lower end portion of the rod portion 138a is fixed to the stripper 134. The upper end portion of the rod portion 138a is inserted into the through hole 135b of the upper die 135. The head portion 138 b has a diameter larger than that of the lower end portion and is accommodated in the accommodation space 135 a of the upper die 135. Therefore, the head 138b can move up and down with respect to the upper mold 135 in the accommodation space 135a.

  The punches A1 to A6 have a function of punching the electromagnetic steel sheet W into a predetermined shape together with the die plate 133 (dies D1 to D6). The punches A1 to A6 are arranged so as to be arranged in this order from the upstream side (the delivery device 12 side) to the downstream side of the punching device 130. The punches A1 to A6 may have a cylindrical shape, for example.

  The punch A3 is a punch for forming a through hole for forming the through hole 5a in the electromagnetic steel sheet W. The punch A3 is urged toward the accommodation space 135c by an urging member (not shown). A rod A3a protruding upward is provided at the base of the punch A3. The rod A3a is inserted into the through hole 135d and can move up and down with respect to the upper mold 135 in the through hole 135d.

  The punch A4 is a caulking forming punch for forming the caulking 5b on the electromagnetic steel sheet W. As shown in FIG. 6, the lower portion of the punch A4 is composed of a main body A4a and a tip A4b. A step A4c is provided over the entire circumference of the punch A4 between the main body A4a and the tip A4b. Therefore, the front end portion A4b extends downward from the main body portion A4a via the stepped portion A4c. The outer shape of the tip end portion A4b is set to be smaller than the outer shape of the main body portion A4a, and so that the punch A4 is smaller than the size of the corresponding through hole D4a. The width G of the stepped portion A4c, that is, the linear distance from the outer surface of the tip end portion A4b to the outer surface of the main body portion A4a in the direction orthogonal to the axis of the punch A4 may be, for example, about 1 μm to 10 μm. It may be about ˜7 μm or about 5 μm.

  The holding pins B1 to B6 have a function of pressing the electromagnetic steel sheet W against the die plate 133 when the electromagnetic steel sheet W is punched by the punches A1 to A6. The holding pins B1 to B6 are arranged so as to be arranged in this order from the upstream side (the delivery device 12 side) of the punching device 130 toward the downstream side.

  The switching mechanism 140 is a cam mechanism, for example, and includes a cam member 141 and an actuator 142. The cam member 141 is slidable in a direction (horizontal direction) in which the accommodation space 135c extends within the accommodation space 135c. The cam member 141 is provided with a recess 141a facing downward (on the punch A3 side). The recess 141a can accommodate the tip of the rod A3a of the punch A3.

  The actuator 142 drives the cam member 141 in the horizontal direction based on the instruction signal from the controller 150. Specifically, the actuator 142 has a first position where the tip end of the rod A3a is located outside the recess 141a and abuts the lower surface of the cam member 141, and the tip end of the rod A3a is accommodated in the recess 141a. The cam member 141 is moved between the second position.

  When the cam member 141 is in the first position, the punch A3 moves relatively downward. When the press machine 137 operates in this state and the movable part 160 descends, the tip end part of the punch A3 is inserted into the through hole D3a of the die D3, so that the electromagnetic steel sheet W is punched (FIG. 8A). reference). Therefore, when the actuator 142 moves the cam member 141 to the first position, the punch A3 and the die D3 (first punch portion) are changed to the first state in which the punching operation of the electromagnetic steel sheet W can be performed. .

  On the other hand, when the cam member 141 is in the second position, the punch A3 moves relatively upward. When the press machine 137 operates in this state and the movable part 160 descends, the tip of the punch A3 is not inserted into the through hole D3a of the die D3 and does not contact the electromagnetic steel sheet W. No processing is performed (see FIG. 9A). Therefore, when the actuator 142 moves the cam member 141 to the second position, the punch A3 and the die D3 are changed to the second state in which the punching operation of the electromagnetic steel sheet W cannot be performed. Thus, the switching mechanism 140 is configured to be able to selectively change the state of the punch A3.

[Method for manufacturing stator core]
Next, a method for manufacturing the stator laminated core 1 will be described with reference to FIGS. 3, 4 and 7 to 9. First, a process (first process; first process) of forming the punching member 10 provided with the through hole 5a while forming the through hole 5a in the electromagnetic steel sheet W (through hole forming process) will be described. Here, the controller 150 instructs the actuator 142 to change the states of the punch A3 and the die D3 to the first state. Therefore, the position of the bottom dead center of the punch A3 is displaced downward. Next, the controller 150 instructs the feeding device 120 to sequentially feed the magnetic steel sheets W.

  When the electromagnetic steel sheet W is sent out to the punching device 130 by the delivery device 120 and the processed part of the electromagnetic steel sheet W reaches the punch A1, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 to the die plate. Push down toward 133. Even after the stripper 134 reaches the die plate 133 and the electromagnetic steel sheet W is sandwiched between them, the controller 150 instructs the press machine 137 to push the movable part 160 downward. At this time, the stripper 134 does not move, but the tip portions of the punches A1 to A6 and the holding pins B1 to B6 move in the through holes F1 to F12 of the stripper plate 104, and the corresponding through holes D1a to D1 in the die plate 133 are moved. It reaches D6a and the insertion holes E1 to E6. Therefore, the electromagnetic steel sheet W is punched along a predetermined punching shape by the punch A1, and a pair of through holes W1 are formed in the vicinity of both side edges of the electromagnetic steel sheet W. (See position S1 in FIGS. 4 and 7). The punched waste material is discharged from the discharge hole C1 of the lower mold 132. Thereafter, the press machine 137 operates to raise the movable part 160.

  Next, when the electromagnetic steel sheet W is sent out by the feeding device 120 and the processed portion of the electromagnetic steel sheet W reaches the punch A2, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 up and down. Thereby, the electromagnetic steel sheet W is punched along a predetermined punching shape by the punch A2, and a plurality of through holes W2 (six through holes W2 in this embodiment) are formed in the central portion of the electromagnetic steel sheet W (FIG. 4). And position S3 in FIG. 7). The plurality of through holes W2 are arranged in a circular shape. Each through hole W2 corresponds to the slot 4 of the stator laminated core 1. The punched waste material is discharged from the discharge hole C2 of the lower mold 132. When the electromagnetic steel sheet W is punched by the punch A2, the pressing pins B1 and B2 are inserted into the through hole W1 and the insertion holes E1 and E2 (see positions S2 and S4 in FIGS. 4 and 7).

  Next, when the electromagnetic steel sheet W is sent out by the feeding device 120 and the processed part of the electromagnetic steel sheet W reaches the punch A3, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 up and down. Thereby, the front-end | tip part of punch A3 is pressed against the electromagnetic steel plate W, and the front-end | tip part of punch A3 is inserted in the through-hole D3a of die | dye D3 with the electromagnetic steel plate W. Therefore, the electromagnetic steel sheet W is punched by the punch A3, and a plurality of through holes W3 (six through holes W3 in this embodiment) are formed in the electromagnetic steel sheet W (position S5 in FIGS. 4 and 7 and FIG. 8). (See (a)). The plurality of through holes W3 are arranged in a circular shape. Each through hole W <b> 3 corresponds to the through hole 5 a of the stator laminated core 1. The punched waste material is discharged from the discharge hole C3 of the lower mold 132. When the electromagnetic steel sheet W is punched by the punch A3, the pressing pins B2 and B3 are inserted into the through hole W1 and the insertion holes E2 and E3 (see positions S4 and S6 in FIGS. 4 and 7).

  Next, when the electromagnetic steel sheet W is sent out by the delivery device 120 and the processed portion of the electromagnetic steel sheet W reaches the punch A4, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 up and down. Accordingly, only the tip end portion A4b of the punch A4 is inserted into the through hole W3 (through hole 5a) formed at the position S5 (see the position S7 in FIGS. 4 and 7 and FIG. 8B). . Therefore, at this time, the magnetic steel sheet W is not processed by the punch A4. At this time, the pressing pins B3 and B4 are inserted into the through hole W1 and the insertion holes E3 and E4 (see positions S6 and S8 in FIGS. 4 and 7).

  Next, when the electromagnetic steel sheet W is sent out by the delivery device 120 and the processed part of the electromagnetic steel sheet W reaches the punch A5, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 up and down. Thereby, the electromagnetic steel sheet W is punched out by the punch A5, and one through hole W5 is formed in the electromagnetic steel sheet W (see position S9 in FIGS. 4 and 7). The through hole W5 is located at the central portion in the width direction of the electromagnetic steel sheet W, and is connected to the inner edges of the plurality of through holes W5. The punched waste material is discharged from the discharge hole C5 of the lower mold 132. When the electromagnetic steel sheet W is punched by the punch A5, the pressing pins B4 and B5 are inserted into the through hole W1 and the insertion holes E4 and E5 (see positions S8 and S10 in FIGS. 4 and 7).

  Next, when the electromagnetic steel sheet W is sent out by the feeding device 120 and the processed part of the electromagnetic steel sheet W reaches the punch A6, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 up and down. Thereby, the electromagnetic steel sheet W is punched along the predetermined punching shape R (circular shape in this embodiment) by the punch A6, and the punching member 10 having a shape corresponding to the punching shape R is formed (FIGS. 4 and 7). Position S11). When the electromagnetic steel sheet W is punched by the punch A6, the pressing pins B5 and B6 are inserted into the through hole W1 and the insertion holes E5 and E6 (see positions S10 and S12 in FIGS. 4 and 7). Thus, the punching member 10 provided with the through-hole 5a is placed on the cylinder 132a in the discharge hole C6 and becomes the lowermost layer of the stator laminated core 1.

  Next, a process (second process; second process) of forming the punching member 10 provided with the crimp 5b while forming the crimp 5b on the electromagnetic steel sheet W (crimp formation process) will be described. Here, the controller 150 instructs the actuator 142 to change the state of the punch A3 and the die D3 to the second state. Therefore, the position of the bottom dead center of the punch A3 is displaced upward. Next, the controller 150 instructs the feeding device 120 to sequentially feed the magnetic steel sheets W. Since the formation of the through holes W1 and W2 by the punches A1 and A2 is the same as the first step described above, the description thereof is omitted.

  After the electromagnetic steel sheet W is punched by the punch A2, the electromagnetic steel sheet W is sent out by the feeding device 120. When the processed part of the electromagnetic steel sheet W reaches the punch A3, the controller 150 instructs the press machine 137 to press the press machine 137. Raises and lowers the movable part 160. At this time, the tip of the punch A3 is not inserted into the through hole D3a of the die D3 and does not contact the electromagnetic steel plate W. Therefore, no processing is performed on the electromagnetic steel sheet W (see position S5 in FIGS. 4 and 7 and FIG. 9A). When the electromagnetic steel sheet W is punched by the punch A3, the pressing pins B2 and B3 are inserted into the through hole W1 and the insertion holes E2 and E3 (see positions S4 and S6 in FIGS. 4 and 7).

  Next, when the electromagnetic steel sheet W is sent out by the delivery device 120 and the processed portion of the electromagnetic steel sheet W reaches the punch A4, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable part 160 up and down. As a result, only the tip A4b of the punch A4 is pressed against the electromagnetic steel sheet W, and the electromagnetic steel sheet W is pushed out into the through hole D4a of the die D4. Accordingly, the electromagnetic steel sheet W is half-punched by the punch A4, and a plurality of processed parts W4 (six processed parts W4 in the present embodiment) are formed on the electromagnetic steel sheet W (see position S7 in FIGS. 4 and 7), FIG. 9 (b)). The plurality of processed portions W4 are arranged in a circular shape. Each processed portion W4 corresponds to the caulking 5b of the stator laminated core 1. When the electromagnetic steel sheet W is processed by the punch A4, the pressing pins B3 and B4 are inserted into the through hole W1 and the insertion holes E3 and E4 (see positions S6 and S8 in FIGS. 4 and 7).

  Subsequent formation of the through hole W5 by the punch A5 and formation of the punching member 10 by the punch A6 are the same as those in the first step described above, and thus the description thereof is omitted. The punching member 10 provided with the caulking 5b is stacked on another punching member 10 placed on the cylinder 132a in the discharge hole C6. At this time, the protrusion of the caulking 5b is fitted into the through hole 5a. The protrusion of the caulking 5b in the other punching member 10 is fitted in the depression of the caulking 5b in one punching member 10. Thereby, each punching member 10 is fastened and the stator laminated iron core 1 is manufactured. In addition, you may join several punching members 10 more reliably by forming the welding part extended along the central axis Ax with respect to the side surface of the several punching member 10 laminated | stacked.

[Action]
By the way, when the punch A4 does not have the stepped portion A4c, that is, when the outer shape of the tip end portion A4b of the punch A4 is approximately the same as the outer shape of the main body portion A4a, the punch A3 (through hole forming punch) and the die D3. If there is an error in the punching accuracy of the through-hole 5a due to an error, an error in the feeding accuracy of the electromagnetic steel sheet W by the feeding device 120, or vibration in the punch A4 during the operation of the punch A4 (caulking punch), the penetration When the punch A4 is inserted into the through-hole 5a in the hole forming process, the punch A4 may rub against the inner wall of the through-hole 5a to generate a burr 10a in the through-hole 5a (see FIG. 10A). . When the stator laminated core 1 is manufactured by laminating the punching members 10 having such burrs 10a (see FIG. 10B), and the motor is configured using the stator laminated core 1, the varis are accompanied with the motor operation. The burr 10a may fall off due to vibration, centrifugal force or the like. Therefore, there is a possibility that the burr 10a collides with the components of the motor, causing abnormal noise from the motor, or affecting the characteristics of the motor.

  Therefore, it is conceivable to chamfer the corner of the tip A4b of the punch A4 when the outer shape of the tip A4b of the punch A4 is approximately the same as that of the main body A4a. In this case, even if the position of the punch A4 deviates from the through hole 5a, when the punch A4 is inserted into the through hole 5a in the through hole forming process, the corners smoothly slide into the through hole 5a while sliding through the through hole 5a. It seems to be guided. However, the punch A4 is inserted into the through hole 5a while the corner portion of the tip A4b of the punch A4 rubs the through hole 5a. Therefore, when the punch A4 is inserted into the through hole 5a, the tip end portion A4b of the punch A4 is bent, and the rigidity of the punch A4 can be reduced by repeating this bending. In addition, since the insulating coating coated on the surface of the electromagnetic steel sheet W can be peeled in the vicinity of the through hole 5a, the conduction area is increased by joining the through hole 5a with the protrusion of the caulking 5b of the other punching member 10, May affect motor characteristics. Furthermore, if the insulating coating coated on the surface of the electromagnetic steel sheet W is peeled off in the vicinity of the through-hole 5a, the peeled insulating coating can adhere to the punched member 10, so that a residue of the insulating coating remains in the stator laminated core 1. It may be necessary to check whether or not

  However, in this embodiment as described above, the punch A4 includes the tip end portion A4b extending from the main body portion A4a via the stepped portion A4c and having a smaller outer shape than the main body portion A4a and the through hole D4a of the die D4. For this reason, an error occurs in the punching accuracy of the through-hole 5a by the punch A3 and the die D3, an error occurs in the feeding accuracy of the electromagnetic steel sheet W by the feeding device 120, or the punch A4 is operated during the operation of the punch A4 (caulking punch). Even when vibration occurs, when only the tip end portion A4b of the punch A4 is inserted into the through hole 5a in the first step, the tip end portion A4b of the punch A4 is extremely difficult to contact the through hole 5a. Therefore, it is possible to suppress the generation of the burr 10a at a low cost by an extremely simple method of providing the step portion A4c between the tip end portion A4b of the punch A4 and the main body portion A4a. Even in this case, the shape and size of the through-hole D3a of the die D3 and the through-hole D4a of the die D4 are substantially the same, so the punch A4 and the die D4 (second punch portion) form the electromagnetic steel sheet W. The protruding side of the crimped crimp 5b can be fitted into a through hole 5a formed in the electromagnetic steel sheet W by the punch A3 and the die D3 (first punch part).

  In this embodiment, the width of the stepped portion A4c is 1 μm to 10 μm. When the width of the stepped portion A4c is 1 μm or more, the tip end portion A4b of the punch A4 becomes more difficult to come into contact with the through hole 5a, so that the generation of the burr 10a can be further suppressed. If the width of the stepped portion A4c is 10 μm or less, the protrusion of one crimp 5b formed on the electromagnetic steel plate W by the punch A4 and the die D4 and the other crimp 5b formed on the electromagnetic steel plate W by the punch A3 and the die D3. When the recesses are fitted, the recesses do not have to be too small with respect to the protrusions. Therefore, it is possible to fit these protrusions without forcibly press-fitting the protrusions into the depressions, so that it is possible to suppress the deformation of the electromagnetic steel sheet W during these fittings, and punching adjacent in the stacking direction. It is possible to suppress a gap generated between the members 10.

[Other Embodiments]
As mentioned above, although embodiment concerning this indication was described in detail, you may add various deformation | transformation to said embodiment within the range of the summary of this invention. For example, the punches A3 and A4 may have a shape other than a cylindrical shape. Specifically, the punches A3 and A4 may have a quadrangular prism shape. Also in this case, the step A4c of the punch A4 is provided over the entire circumference of the punch A4, as shown in FIG. Alternatively, the punch A3 may be a quadrangular prism and the punch A4 may be a so-called V-shaped punch. In this case, as shown in FIG. 11B, the tip end portion A4b of the punch A4 has a shape in which a triangular prism is integrally provided on the lower end surface of the quadrangular column. The step A4c of the punch A4 is partially provided on the punch A4. That is, the pair of stepped portions A4c are respectively positioned corresponding to the pair of bottom surfaces of the triangular prism of the tip end portion A4b.

  The corner of the tip A4b of the punch A4 may be chamfered (for example, C chamfering, R chamfering, etc.). That is, the corner portion of the tip portion A4b of the punch A4 may be inclined or curved.

  DESCRIPTION OF SYMBOLS 1 ... Stator laminated iron core (stator), 5 ... Crimp part, 5a ... Through-hole, 5b ... Crimp (uneven part), 10 ... Punching member, 100 ... Manufacturing apparatus, 120 ... Sending apparatus (sending part), 130 ... Punching Device: 133 ... Die plate, 134 ... Stripper, 134a ... Stripper plate, 137 ... Press machine (driving unit), 140 ... Switching mechanism (state changing unit), 150 ... Controller (control unit), A3 ... Punch (first) Punch; punch for forming a through hole), A4 ... punch (second punch; punch for caulking), A4a ... main body, A4b ... tip, A4c ... step, D3 ... die (first die), D3a ... through-hole (first die hole), D4 ... die (second die), D4a ... through-hole (second die hole), W ... electromagnetic steel plate (metal plate; work plate).

Claims (8)

A delivery unit configured to intermittently and sequentially deliver a belt-shaped metal plate;
A first die having a first die provided with a first die hole and a first punch disposed to face the first die hole;
Between the first state in which the first punch portion can perform the punching operation of the metal plate and the second state in which the first punch portion cannot perform the punching operation of the metal plate. A state changing part configured to be able to selectively change the state of the part,
A second die provided with a second die hole having substantially the same size and shape as the first die hole, and a second punch disposed so as to face the second die hole A second punch part having
A drive unit for driving the first and second punch units;
A control unit,
The second punch includes a main body portion and a tip portion extending from the main body portion through a step portion and having an outer shape smaller than the main body portion and the second die hole,
The controller is
While controlling the state changing portion to bring the first punch portion into the first state, the feeding portion and the driving portion are controlled so that the feeding portion causes the first processed portion of the metal plate to be processed. After reaching the first punch part, the first punch is inserted into the first die hole by the drive part to punch the metal plate to form a through hole in the metal plate, The first part to be processed of the metal plate is made to reach the second punch part by the feeding part, and only the tip part of the second punch is inserted into the through hole by the driving part. 1 processing and
While controlling the state changing portion to bring the first punch portion into the second state, the feeding portion and the driving portion are controlled so that the second working portion of the metal plate is controlled by the feeding portion. The first punch portion is reached by the drive portion, and the first punch portion is driven by the drive portion, but the first punch is not brought into contact with the metal plate. A second workpiece part is made to reach the second punch portion, and only the tip end portion of the second punch is pressed against the metal plate by the driving portion, and the metal plate is moved into the second die hole. The manufacturing apparatus of a laminated iron core which performs the 2nd process which forms an uneven | corrugated | grooved part in the said metal plate by pushing out.   The width | variety of the said level | step-difference part is a manufacturing apparatus of the laminated iron core of Claim 1 which is 1 micrometer-10 micrometers.   The apparatus for manufacturing a laminated core according to claim 1, wherein the stepped portion is provided over the entire circumference of the second punch.   The apparatus for manufacturing a laminated iron core according to claim 1 or 2, wherein the step portion is partially provided on the second punch. The first die having a first die hole and a first punch portion having a first punch disposed so as to face the first die hole, the first of the band-shaped metal plate The first die hole is formed by punching out the metal plate by inserting the first punch into the first die hole to form a through hole in the metal plate. A second die hole provided with a second die hole having substantially the same size and shape as the second die hole, and a second punch having a second punch arranged so as to face the second die hole The first processed portion of the metal plate is sent to the punch portion, extends from the main body portion of the second punch through the stepped portion, and has an outer diameter larger than that of the main body portion and the second die hole. A first step of inserting only a small tip portion into the through hole;
The second processed portion of the metal plate is sent to the first punch portion, and the metal plate is not punched by the first punch portion. Thereafter, the second processed portion of the metal plate is processed. The portion is fed to the second punch portion, and only the tip portion of the second punch is pressed against the metal plate, and the metal plate is pushed into the second die hole so that the metal plate is uneven. And a second step of forming the part.   The method for manufacturing a laminated core according to claim 5, wherein the stepped portion has a width of 1 μm to 10 μm.   The method for manufacturing a laminated core according to claim 5 or 6, wherein the step portion is provided over the entire circumference of the second punch.   The method for manufacturing a laminated core according to claim 5 or 6, wherein the stepped portion is partially provided on the second punch.

Images