JP5227664B2 - Manufacturing apparatus and manufacturing method of laminated iron core - Google Patents

Description

  The present invention relates to a method and apparatus for manufacturing a laminated core used for a stator or a rotor of a rotating electric machine, and more particularly to an apparatus and method for manufacturing a laminated core formed by laminating a plurality of types of core thin plates having different external shapes. .

  A laminated iron core for a rotating electric machine such as a motor is generally manufactured by a progressive die apparatus using a hoop material (band-shaped thin steel plate) of an electromagnetic steel plate as a raw material. In the progressive die apparatus, a predetermined punching process is sequentially performed on the hoop material so that the iron core thin plate is continuously formed, and a predetermined number of core thin plates after external punching are stacked and fixed to form a laminated core. Manufactured. In this type of mold apparatus, there is a technique for manufacturing a laminated iron core in which a predetermined number of core thin plates having different outer shapes and the like are laminated.

  For example, a plurality of hoop materials for punching two or more types of core pieces having different outer shapes and the like are supplied in a parallel state, and these hoop materials are punched using an upper die and a lower die, and the lower die There is a method for manufacturing a laminated core in which the core pieces are sequentially laminated and integrated in a predetermined order in the same die part of a mold and then taken out from the die part (see Patent Document 1).

Japanese Patent No. 2876149

However, the invention described in Patent Document 1 has a configuration in which a plurality of hoop materials having different external shapes and the like are supplied in a parallel state in the mold, so that there is a problem that the mold becomes large and the apparatus cost increases. It was. In addition, when a plurality of types of core pieces punched from each hoop material are stacked, a means for rotationally driving the die device is required, which complicates the mold structure and increases the cost of the device. . Furthermore, a plurality of types of iron core thin plates having different external shapes have a problem that it is difficult to accurately align them during lamination after punching.

  The present invention has been devised in view of such problems of the prior art, and in the manufacture of a laminated core formed by laminating a plurality of types of core thin plates having different external shapes, each core thin plate is accurately aligned. An object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a laminated iron core that can be laminated while being laminated.

  1st invention made | formed in order to solve the said subject is a manufacturing apparatus (11) of the laminated iron core (1) formed by laminating | stacking multiple types of iron core thin plate (2a-2c) from which an external shape differs, Comprising: Intermittent transfer A guide hole punching means for punching a guide hole (D) in a region where each of the core thin plates of the strip-shaped thin steel plate (3) to be formed, and after half-punching or punching each of the core thin plates from the strip-shaped thin steel plate Iron core thin plate punching means (24 to 26, 34 to 36) for pushing back, and separation laminating means for sequentially laminating each of the pushback iron core thin plates from the strip-shaped thin steel plate, the separation laminating means comprising: A punch (27) for separating each of the pushed-back iron core thin plates from the strip-shaped steel plate, a die (37) in which the separated iron core thin plates are sequentially laminated, and each of the iron core thin plates. Wherein by being inserted into the guide hole, a structure having said guide member (81) for guiding a stack of the core sheet.

  As a second aspect of the invention made to solve the above-mentioned problems, it may be configured to further include a supporting means (72) for supporting the iron core thin plates arranged and stacked in the die.

  As a third invention for solving the above-mentioned problems, the separating and laminating means further includes a squeeze ring (70) provided below the die and in pressure contact with at least a part of the outer periphery of each iron core thin plate. It can be set as the structure which has.

  As a fourth invention made to solve the above problems, the guide member is provided so as to be able to advance and retreat from the punch side toward the die side, and when the punch pushes the iron core thin plate into the die. , It can be configured to advance into the die.

  A fifth invention made to solve the above problems is a method of manufacturing a laminated iron core in which a plurality of types of iron core thin plates having different external shapes are laminated, wherein each of the iron core thin plates of the strip-like thin steel plate that is intermittently transferred is provided. A guide hole punching process for punching a guide hole in a region to be formed; an iron core sheet punching process for pushing back after half-punching or punching each of the core sheet from the strip-shaped steel sheet; and each of the core sheets that are pushed back Laminating step of sequentially separating from the strip-shaped thin steel plate, in the laminating step, each push-backed iron core thin plate is separated from the strip-shaped thin steel plate by a punch, When the core thin plates are stacked in sequence within the die, guide members for guiding the stack are inserted into the guide holes of the core thin plates. A configuration that is.

  According to the first and fifth aspects of the invention, in the manufacture of a laminated core formed by laminating a plurality of types of core thin plates having different outer shapes, the guide member is inserted into the guide hole of each core thin plate to guide the lamination. For this reason, it is possible to stack the respective iron core thin plates while accurately positioning them. Since each thin iron core sheet having a different external shape can be punched from the same strip-shaped thin steel sheet that is intermittently transferred, there is an advantage that it is not necessary to increase the size of the mold.

  According to the second aspect of the invention, since the iron core thin plates stacked in the die can be stably supported, it is possible to align the iron core thin plates having different outer shapes with higher accuracy.

  According to the said 3rd invention, it becomes easy to mutually fix each iron core thin plate from which an external shape differs, aligning more accurately.

  According to the fourth aspect of the invention, the guide member can guide the lamination by advancing into the die at the time of the lamination process of each iron sheet, while the guide member retracts from the die at the time of the intermittent transfer of the strip-shaped steel sheet. Therefore, the intermittent transfer can be prevented from being hindered.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view of a laminated core manufactured by the manufacturing apparatus and manufacturing method of the present invention, and FIG. 2 is a diagram showing an example of a strip layout for the laminated core of FIG.

  As shown in FIG. 1, the laminated core 1 is used for an apparatus such as a resolver, for example, and has a configuration in which a predetermined number of three types of core thin plates 2 a to 2 c having different external shapes are laminated. The first iron core thin plate 2a has an oval outer shape, and a shaft hole D is provided at a position deviated from the center to one side in the longitudinal direction (right side in FIG. 1). The 2nd iron core thin plate 2b has a circular external shape, and the axial hole D is provided in the center part. Moreover, the 3rd iron core thin plate 2c has an oval external shape, and the axial hole D is provided in the position biased to the one side (left side in FIG. 1) of the longitudinal direction from the center.

  As shown in FIG. 2, the manufacturing process of the laminated core 1 includes the first half punching steps (1) to (6) for forming the outer shape of the iron core thin plates 2a to 2c on the hoop material 3, and the iron core thin plates 2a to 2c. A separating and laminating step (7) of laminating while sequentially separating from the hoop material 3.

  In the first half punching process, the hoop material 3 is formed by punching the pilot hole P (1) and punching the caulking hole C1 (2) for the measuring iron core thin plate (that is, the iron core thin plate located at the lowest layer of the laminated core 1). The caulking portion (here, a half-dumped dowel shape having an upper concave portion and a lower convex portion) C2 formation (3) and half of each core thin plate 2a to 2c is half-cut with respect to the core thin plate other than the punching and metering of the shaft hole D Forming the outer shape of each core thin plate by punching out (or punching in some cases) and then pushing back (that is, performing a process of stopping the lowering of the punch in the middle of the thickness of the hoop material 3 and then returning it to the original position) (4) to (6) are sequentially applied to form the basic shapes of the iron core thin plates 2a to 2c having different outer shapes.

  After the first half punching step, a separation and lamination step (7) is performed. In this separation and lamination step (7), the pushed-back iron core thin plates 2a to 2c are laminated while being sequentially separated from the hoop material 3. At this time, the caulking hole C1 formed in the iron core thin plate for measuring or the caulking portion C2 formed in the iron core thin plate other than the measuring iron fits each other between the adjacent iron core thin plates so that a predetermined number of iron core thin plates are formed. The laminated iron core 1 is formed by being fixed to each other. More specifically, the lower convex portion of the caulking portion C2 of the second core thin plate positioned above is fitted into the caulking hole C1 of the measuring core thin plate positioned in the lowermost layer, and further the second position. Adhering between the iron core thin plates is performed in such a manner that the lower convex portion of the caulking portion C2 of the third iron core thin plate positioned thereon is fitted into the upper concave portion of the caulking portion C2 of the iron core thin plate.

  FIG. 3 is a schematic configuration diagram of a progressive mold apparatus constituting the laminated core manufacturing apparatus of the present invention, and FIGS. 4 and 5 are enlarged detailed views of FIG. 3X for explaining details of the separation and lamination process. In addition, (1)-(7) shown to the progressive die apparatus 11 of FIG. 3 shows a response | compatibility with each process (1)-(7) shown in FIG.

As shown in FIG. 3, the progressive mold apparatus 11 includes an upper mold 12 and a lower mold 13, and the hoop material 3 is supplied from one side of the apparatus (left side in FIG. 3) between these molds. The While the hoop material 3 is intermittently transferred at a predetermined pitch (inter-process distance), punching processing or lamination of the iron core thin plate is performed. The progressive die apparatus 11 includes a plurality of punches 21 to 26 attached to the upper mold 12 moving in the vertical direction and a plurality of dies 31 to 36 attached to the lower mold 13 to the first half punching step (1). Perform (6). Further, the progressive die apparatus 11 performs the separation and lamination step (7) by the pressing punch 27 attached to the upper mold 12 and the die 37 attached to the lower mold 13. A stripper plate 14 is attached to the upper mold 12. The stripper plate 14 brings the hoop material 3 into contact with the upper surface 13a of the lower mold 13 by its lowering operation, and easily separates the punches 21 to 27 from the hoop material 3 after punching. Various operations of the progressive die apparatus 11 are controlled by the controller 15 as a whole.

  The punch 21 has a tip shape corresponding to the pilot hole P. When the hoop material 3 is intermittently transferred in the direction of the arrow in FIG. 3, a pilot pin (not shown) is inserted into the punched pilot hole P, thereby aligning the hoop material 3 in each step (1) to (7). Is possible.

  The punch 22 has a tip shape corresponding to the four caulking holes C1. The punch 22 moves forward and backward between a punching position (lower position) where the tip end (lower end) can punch the hoop material 3 and a standby position (upward position) where the tip portion cannot punch the hoop material 3. It is provided as possible. A well-known cam mechanism 41 and a cam driving device 42 are provided on the upper portion of the punch 22 to realize the forward and backward movement. The cam drive device 42 is composed of, for example, a solenoid or a cylinder device, and drives the cam mechanism 41 based on a control command from the controller 15. The punch 22 moves to a punching position when processing a measuring iron core thin plate, and moves to a standby position when processing other than the measuring iron core thin plate.

  The punch 23a and the punch 23b each have a tip shape corresponding to the shaft hole D and the four caulking portions C2 formed around the shaft hole D. Inside the die 33, a receiving member 43 provided so as to face the punch 23b is disposed. The receiving member 43 is urged upward (in the direction of the punch 23b) by a spring 44 connected to the lower end thereof, and by this urging force, a caulking portion C2 having a half-cut dowel shape can be formed. .

  The punches 24 to 26 have tip shapes corresponding to the outer shapes of the iron core thin plates 2a to 2c, respectively. The punches 24 to 26 have a punching position (lowering position) where the tip part can half-punch the hoop material 3 and a standby position (rising position) where the tip part cannot half-punch the hoop material 3. It is provided so that it can move forward and backward. Well-known cam mechanisms 51 to 53 and cam driving devices 54 to 56 for realizing the forward / backward movement of the punches 24 to 26 are provided, respectively. The cam driving devices 54 to 56 drive the cam mechanisms 51 to 53 based on the control command of the controller 15. For example, the punch 24 moves to the punching position when the corresponding iron core thin plate 2a is processed, and moves to the standby position for the other iron core thin plates 2b and 2c (the punches 25 and 26 are also the same). ). FIG. 3 shows a case where the punch 24 is in the punching position and the punches 25 and 26 are in the standby position.

  In addition, receiving members 61 to 63 provided to face the punches 24 to 26 are arranged inside the dies 34 to 36. The receiving members 61 to 63 are respectively biased upward (in the direction of the punches 24 to 26) by springs 64 to 66 connected to the lower ends thereof, and the iron core thin plates 2a to 2c are half-pulled by this biasing force. It will be possible to push back later.

  The pushing punch 27 constitutes a separating means for the iron core thin plate together with the die 37. The pushing punch 27 has a function of pressing the iron core thin plates 2 a to 2 c pushed back toward the die 37, and separates the iron core thin plates 2 a to 2 c from the hoop material 3 and pushes them into the die 37. As shown in FIGS. 4 and 5, the die 37 is provided so as to be in pressure contact with at least a part of the outer periphery of each of the iron core thin plates 2 a to 2 c having different outer shapes. The iron core thin plates 2 a to 2 c separated from the hoop material 3 are sequentially laminated inside the die 37.

  The squeeze ring 70 provided concentrically below the die 37 constitutes a means for laminating iron core thin plates together with the die 37. Similar to the die 37, the squeeze ring 70 is provided so as to be in pressure contact with at least a part of the outer periphery of each of the core thin plates 2a to 2c, thereby guiding the lamination of the core thin plates.

  As shown in FIGS. 4 and 5, inside the die 37, a support device 72 that supports iron core thin plates (laminated bodies) stacked in the die 37 is provided. The support device 72 is connected to a cradle 73 on which an iron core thin plate separated from the hoop material 3 is placed, a support shaft 74 that supports the cradle 73, and a lower end of the support shaft 74. An elevating mechanism 75 that elevates and lowers the cradle 73 is provided. The lifting mechanism 75 allows the cradle 73 to move up and down between an upper limit position near the upper end of the die 37 and a lower limit position (unloading position) below the squeeze ring 70. The elevating mechanism 75 is composed of, for example, a hydraulic cylinder. In addition, the cradle 73 is provided with a recess 73a that opens on the upper surface thereof.

Further, a substantially cylindrical guide pin 81 having an outer diameter that can be fitted into the shaft hole D of each of the iron core thin plates 2a to 2c is inserted and disposed in the shaft center of the push punch 27. A cam mechanism 82 is provided on the guide pin 81. The cam mechanism 82 is provided with a flange member 83 in the middle of the guide pin 81. The flange member 83 has a tapered upper portion that is slidable with respect to the cam surface 84a of the cam plate 84, whereby the guide pin 81 can be moved back and forth (up and down). The lower mold 13 is provided with a cam driving piece 85 for driving the cam plate 84 in the horizontal direction.

  When the upper mold 12 shown in FIG. 4 is raised, the cam drive piece 85 has an inclined portion 85a provided at the tip thereof inserted into the insertion hole 84b of the cam plate 84, and a part of the inclined portion 85a is inserted into the insertion hole 84b. It is in the state engaged with the inclined inner surface. At this time, the cam plate 84 is in the retracted position (left end position), and the guide pin 81 is also in the retracted position (upward position). On the other hand, when the upper mold 12 shown in FIG. 5 is lowered (that is, when the iron core thin plates 2 a to 2 c are separated from the hoop material 3), the inclined portion 85 a of the cam drive piece 85 is inserted into the insertion hole of the cam plate 84. The straight body portion 85b penetrates through 84b and engages with the inner surface of the insertion hole 84b of the cam plate 84. At this time, as indicated by an arrow in FIG. 5, the cam plate 84 moves to the forward movement position (right end position) on the support base 87 against the urging force of the spring 86 provided at the rear end, and the guide pin 81 is moved. Then, it moves to the forward movement position (downward position) against the urging force of the spring 88 provided at the end. As a result, the guide pin 81 is advanced from the tip of the push punch 27 toward the die 37 side, and is inserted into the separated core thin plate and the shaft hole D of the core thin plate stacked in the die 37. Become.

  Note that the guide pin 81 can guide the stacking by moving into the die 37 during the stacking process of the respective iron core thin plates due to the forward and backward movement thereof, while as shown in FIG. 4 during the intermittent transfer of the hoop material 3. Further, the intermittent transfer can be prevented from being hindered by retreating from the die 37 (that is, in a state of being generally accommodated inside the push punch 27).

  When the laminated iron core 1 shown in FIG. 1 is manufactured in the progressive die apparatus 11 having the above-described configuration, the hoop material 3 is formed by first forming the pilot hole P by the punch 21 and then the core thin plate 2c positioned at the lowermost layer. For this, the caulking hole C1 is punched by the punch 22. Subsequently, while the shaft hole D is punched by the punch 23a, the caulking portion C2 is formed by the punch 23b on the second to fourth iron core thin plates 2c overlapping therewith. Next, the punch 24 performs a punching operation, and the punches 25 and 26 perform a standby operation, whereby the iron core thin plate 2c is half-punched and then pushed back. Note that the iron core thin plate 2b and the iron core thin plate 2a that are superimposed on the iron core thin plate 2c are processed in the same manner as the second and subsequent iron core thin plates 2c.

  Next, the pushed-back iron core thin plates 2 a to 2 c are pushed into the die 37 and stacked while being sequentially separated from the hoop material 3 by the push punch 27. The core thin plates 2a to 2c sequentially stacked in the die 37 are sequentially pushed into the squeeze ring 70 below the die 37 as new core thin plates are stacked. When the core thin plates 2a to 2c are stacked, the guide pin 81 advances from the tip of the pressing punch 27 toward the die 37 when the upper die 12 is lowered, and the separated core thin plate and It is inserted into the shaft hole D of the core thin plates stacked in the die 37.

  By inserting the guide pins 81 into the shaft holes D to guide the stacking of the iron core thin plates 2a to 2c, it is possible to stack the iron core thin plates 2a to 2c while accurately aligning them. At this time, as shown in FIG. 5, the tip of the guide pin 81 penetrates the iron core thin plate and is fitted into the recess 73 a of the receiving base 73, thereby preventing positional deviation of the tip of the guide pin 81 and stacking. There is an advantage that the guide can be implemented more stably and with high accuracy.

  The cradle 73 of the support device 72 descends by the thickness of one core thin plate each time a new core thin plate is stacked after the core thin plate that is the lowest layer of the stacked core is placed at the upper limit position. . Since this support device 72 can stably support the core thin plates stacked in the die 37, the core thin plates having different outer shapes can be aligned with higher accuracy. Further, in FIG. 5, only one iron core thin plate is shown in the die 37. However, when the iron core thin plate is separated thereafter, a plurality of iron core thin plates (laminates) are provided between the lowered punch 27 and the cradle 73. Since it becomes the state clamped by the predetermined pressure, the adhesiveness between iron core thin plates increases, and it becomes possible to fix them more reliably. Each core thin plate is brought into close contact with the other adjacent iron core thin plates in the die 37 and the squeeze ring 70 by the frictional force generated on the outer peripheral surface. Thus, the iron core thin plates having different outer shapes can be fixed to each other by engaging the caulking portions C2 (or the caulking portion C2 and the caulking hole C1) while aligning the core thin plates with different accuracy.

  When one laminated iron core is finally formed by fixing a predetermined number of iron core thin plates, the cradle 73 of the support device 72 moves to the lowered position. Thereby, the laminated iron core 1 discharged | emitted from the squeeze ring 70 lower part is extruded out of the apparatus using the well-known carrying-out apparatus 91, and is sent to the following process.

  Although the present invention has been described in detail based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the method of fixing each iron core thin plate is not limited to the above-described laminated caulking method, for example, an adhesive supply device is provided in the progressive die apparatus, and the iron core thin plate is applied after applying the adhesive to the surface of the hoop material. A method of laminating and adhering, or providing laser beam irradiation means at the squeeze ring portion, irradiating laser beams from the side surface to each laminated core plate, and bonding the adjacent core plates vertically by welding A method may be used. Moreover, various changes are possible for the outer shape of the iron core thin plate, the stacking order thereof, and the like.

Schematic perspective view of a laminated iron core manufactured according to the present invention The figure which shows an example of the strip layout about the laminated iron core of FIG. Schematic configuration diagram of a progressive mold apparatus according to the present invention FIG. 3X is an enlarged detailed view illustrating the details of the separation and lamination process of FIG. FIG. 3X is an enlarged detailed view illustrating the details of the separation and lamination process of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated iron core 2a-2c Iron core thin plate 3 Hoop material 11 Progressive die apparatus 12 Upper mold 13 Lower mold 14 Stripper plate 15 Controllers 21-26 Punch 27 Push-punch 31-37 Die 70 Squeeze ring 72 Support device 73 Base 75 Elevating mechanism 81 Guide pin 82 Cam mechanism 83 鍔 member 84 Cam plate 84a Cam surface 85 Cam drive piece 85a Inclined portion 85b Straight body portion 91 Unloading device C1 Caulking hole C2 Caulking portion D Shaft hole P Pilot hole

Claims (5)

A laminated core manufacturing apparatus in which a plurality of types of core thin plates with different external shapes are stacked,
A guide hole punching means for punching the guide hole in a region where each of the iron core thin plates of the strip-shaped thin steel plate to be intermittently transferred is formed;
Iron core thin plate punching means for pushing back after half punching or punching each iron core thin plate from the strip-shaped thin steel plate,
Separating and laminating means for sequentially laminating each push-backed iron sheet thin sheet from the strip-shaped sheet steel sheet,
The separating and laminating means includes a punch for separating each of the push-backed iron core thin plates from the strip-shaped thin steel plate,
A die in which each of the separated core thin plates is sequentially laminated;
By being inserted the into the guide hole of each core sheet, have a guide member for guiding the laminate of the each core sheet,
The guide member is provided so as to be able to advance from the punch side toward the die side, and advances into the die during the lamination of the respective iron core thin plates, while from the die during the intermittent transfer of the strip-like thin steel plates. An apparatus for manufacturing a laminated iron core, characterized by retreating . 2. The laminated core manufacturing apparatus according to claim 1, wherein the guide member is in a state of advancing from a tip of the punch toward the die when the iron core thin plates are stacked . Disposed within the die, and further have a support means for supporting said core sheet being laminated, the the support means receives each core sheet separated from the strip steel sheets is placed in said die The apparatus for manufacturing a laminated iron core according to claim 1 or 2 , wherein a stand is provided . Each time the new iron core thin plate is laminated after the iron core thin plate which is the lowest layer of the iron core thin plate laminated by the separating and laminating means is placed at the upper limit position of the cradle, the iron core thin plate 4. The laminated core manufacturing apparatus according to claim 3 , wherein the apparatus is lowered by a thickness of one sheet . A method for producing a laminated core in which a plurality of types of iron core thin plates having different external shapes are laminated,
A guide hole punching process for punching the guide hole in a region where each iron core thin plate of the strip-shaped thin steel plate to be intermittently transferred is formed;
An iron core thin plate punching step for pushing back after half punching or punching each iron core thin plate from the strip-shaped thin steel plate;
A lamination step of laminating each push-backed iron core thin plate while sequentially separating from the strip-shaped thin steel plate,
In the laminating step, each push-backed iron core thin plate is pushed into the die by a punch and separated from the strip-shaped thin steel plate, and each separated iron core thin plate is sequentially laminated inside the die, and the punch There when pushing the core sheet into the die, the manufacture of laminated iron core, wherein a guide member that advances toward the die side from the punch side is passed inserted into the guide hole of each core sheet Method.

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