JP5160944B2 - Manufacturing method and manufacturing apparatus of laminated iron core - Google Patents

Description

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

  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.

  As such a technique, for example, a plurality of hoop materials for punching two or more kinds of core pieces having different outer shapes and the like are supplied in a parallel state, and these hoop materials are used as an upper mold and a lower mold. There is a method of manufacturing a laminated core that is punched and used, and is sequentially laminated and integrated as core pieces in a predetermined order in the same die part of the lower mold, and then taken out from the die part (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 outer shapes and the like are supplied in parallel in the mold, so that there is a problem that the mold becomes large and the apparatus cost increases. there were. 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. .

  The present invention has been devised in view of such problems of the prior art, and a method for producing a laminated core that can easily produce a laminated core formed by laminating a plurality of types of core thin plates having different outer shapes. And it aims at providing a manufacturing apparatus.

1st invention made | formed in order to solve the said subject is a manufacturing method of the laminated iron core (1) formed by laminating | stacking multiple types of iron core thin plate (AC) from which external shape differs, Comprising: 3) A punching process for punching or punching each of the iron core thin plates, and a dummy for punching a dummy thin plate (S) having the same outer shape larger than each of the iron core thin plates from the strip steel plate together with the iron core thin plate. A configuration having a thin plate punching step, a stacking step of stacking the dummy thin plates to form a stacked body (2), and a removing step of removing unnecessary portions (Da to Dc) other than the core thin plates from the stacked body And

In this case, in order to laminate the dummy thin plate having the same outer shape in the lamination step, the same lamination means as the conventional progressive mold for producing a single type of iron core thin plate (for example, a die, a squeeze ring, and a laminated body from within the die) And the like, and there is no inconvenience that the mold used in the manufacturing apparatus becomes complicated or large. Moreover, since this manufacturing method can be easily applied to a manufacturing apparatus equipped with a progressive die or the like, there is also an advantage that productivity can be improved by manufacturing automation.

  As a second invention made to solve the above-mentioned problems, in the iron core thin plate punching step, the iron core thin plates can be pushed back after being half punched or punched.

  As a third invention made to solve the above-mentioned problems, the method further comprises a caulking joint forming step for forming caulking joints (b, d) on each of the iron core thin plates before the laminating process, In the step, the adjacent iron core thin plates can be caulked and joined to each other by the caulking joint.

  As a fourth invention made to solve the above problems, the method further comprises a notch punching step of punching a notch (A) in an outer peripheral edge of the dummy thin plate, and in the laminating step, the dummy thin plate is By laminating with the positions of the notch portions, a groove portion (R) composed of a set of the notch portions is formed on the outer peripheral surface of the laminate, and in the removing step, the groove portion of the laminate is on the outside. The unnecessary portion can be removed by being expanded.

As 5th invention made | formed in order to solve the said subject, it is a manufacturing apparatus of the laminated iron core (1) formed by laminating | stacking several types of iron core thin plate (AC) from which external shape differs, Comprising: 3) From the core thin plate punching means (P4 to P6) for half-punching or punching each of the iron core thin plates, push back means (41 to 43) for pushing back each of the iron core thin plates, the same larger than each of the iron core thin plates Dummy thin plate punching means (P7) for punching out the dummy thin plate (S) having an outer shape integrally with the iron core thin plate from the strip-shaped thin steel plate, and laminating means (51) for stacking the dummy thin plates to form a laminate (2). , 52) and removal means for removing unnecessary portions (Da to Dc) other than the respective iron core thin plates from the laminated body.

  As a sixth invention made to solve the above-mentioned problems, it further includes caulking coupling part forming means (P2, P3) for forming caulking coupling parts (b, d) on each of the iron core thin plates. The adjacent iron core thin plates can be caulked and coupled to each other by the caulking coupling portion.

  According to the first and fifth inventions, it is possible to easily manufacture a laminated core formed by laminating a plurality of types of iron core thin plates having different outer shapes. Further, according to the second aspect, it is possible to easily realize the process of punching the dummy thin plate integrally with the iron core thin plate. Further, according to the third and sixth inventions, the dummy thin plate can be easily fixed in the stacking step to form a stacked body, and the iron core thin plate is fixed after the unnecessary portion is removed in the removing step. Can be maintained. Moreover, according to the said 4th invention, it becomes possible to remove an unnecessary part easily in a removal process.

  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 method of the present invention, and FIG. 2 is a diagram showing a strip layout to which the manufacturing method of the present invention is applied.

  As shown in FIG. 1, a laminated core 1 is used in an apparatus such as a resolver, for example, and has a configuration in which a predetermined number of three types of core thin plates A to C having different outer shapes are laminated. The first iron core sheet A has an oval outer shape, and an opening C is provided at a position deviated from the center to one side in the longitudinal direction (right side in FIG. 1). The second iron core thin plate B has a circular outer shape, and an opening C is provided at the center thereof. The third iron core thin plate C has an oval outer shape, and an opening C is provided at a position deviated from the center to one side in the longitudinal direction (left side in FIG. 1).

As shown in FIG. 2, in the method for manufacturing a laminated core according to the present invention, each of the iron core thin plates A to C constituting the laminated core 1 is replaced with a dummy part (see reference numerals Da to Dc in FIG. ) And an iron core thin plate (hereinafter referred to as “dummy thin plate”) S having the same outer shape (a predetermined outer diameter larger than the iron core thin plates A to C), and after the dummy thin plate S is laminated, Remove the dummy part. The manufacturing process of the laminated iron core 1 includes punching steps (1) to (7) for punching the iron core sheets A to C into a predetermined shape, a laminating process (8) for laminating the punched dummy thin plates S, and laminating. And a removal step (9) for removing the dummy portion from the body 2.

In the punching process, the hoop material 3 includes a punching process (1) of the notch portion (a) used when removing the dummy portion from the laminate 2, and a measuring iron core thin plate (that is, on the lowermost layer of the laminate 2). The punching process (2) of the caulking hole for the iron core thin plate (positioned) and the caulking part for the iron core thin plate other than for the punching process and measuring of the inner diameter (here, the half punched dowel shape having the upper concave portion and the lower convex portion) ) D processing (3), and push back after half-cutting each of the iron core thin plates (a) to (c) (that is, after performing the processing to stop the lowering of the punch in the middle of the thickness of the hoop material 3) The pushback process (4) to (6) and the outer shape E punching process (7) of the dummy thin plate S are sequentially performed and integrated with any one of the iron core thin plates A to C. Dummy thin plate S is formed

Here, in the steps (4) to (6), as shown in FIGS. 3 (A) to (C), each of the core thin plates A to C pushed back and the surrounding dummy portions Da to Dc are respectively dummy. The thin plate S is contained in the outer shape E.

  When the dummy thin plate S is obtained by the punching steps (1) to (7), the stacking step (8) is subsequently performed. In the laminating step (8), the caulking hole b formed in the measuring iron core thin plate or the caulking portion d formed in the iron core thin plate other than the measuring wire is engaged with each other between the adjacent dummy thin plates S, whereby a predetermined number of sheets are obtained. The dummy thin plates S are fixed to each other to form the laminate 2. More specifically, the lower convex portion of the second caulking portion of the iron core thin plate located above is fitted into the caulking hole b of the measuring iron thin plate located at the lowermost layer, and the second position is further located. Adhering between the dummy thin plates S is performed in such a manner that the lower convex portion of the third caulking portion of the iron core thin plate positioned thereon is inserted into the upper concave portion of the caulking portion d of the iron core thin plate.

  If the laminated body 2 is obtained by this lamination process (8), a removal process (9) will be implemented subsequently. In the removal step (9), as shown in FIG. 4, the groove portion R formed by the set of notches i of each dummy thin plate S is expanded outward, and the dummy portions Da to Dc are removed. Thereby, the laminated iron core 1 by which three types of iron core thin plates AC with different external shapes are laminated is obtained.

  FIG. 5 is a schematic configuration diagram of a progressive die device constituting the laminated core manufacturing apparatus of the present invention. In addition, (1)-(8) in the progressive die apparatus 11 shown in FIG. 5 shows a response | compatibility with each process (1)-(8) shown in FIG.

  As shown in FIG. 5, the progressive die apparatus 11 sequentially punches with a plurality of punches P <b> 1 to P <b> 7 attached to an upper mold 13 that moves in the vertical direction while intermittently transferring the hoop material 3 in the apparatus. carry out. At the time of punching, the stripper plate 14 attached to the upper mold 13 is lowered to bring the hoop material 3 into contact with the upper surface 15 a of the lower mold 15.

The punches P1 to P7 have the outer shape E of the notch part i, the caulking hole b, the inner diameter c and the caulking part d, the iron core thin plate A, the iron core thin plate B, the iron core thin plate C and the dummy thin plate S shown in FIG. Each has a suitable shape.

  The punch P2 has its leading end (lower end) lowered to a position where the hoop material 3 can be punched, and its distal end (lower end) reaches a position above the hoop material 3 (that is, a position where punching is impossible). It is possible to selectively execute the standby operation that only lowers, and it is possible to execute the punching operation only in the case of the iron core thin plate for measurement. Such switching of operation can be realized by providing a known linear movement mechanism (pneumatic cylinder drive mechanism or the like) 21 connected to the punch P2 and controlling the operation by the controller 22, for example.

Similarly, the punch P 4 to 6 includes a stamping operation in which the tip is lowered the hoop material 3 to punching (or half-blanking) possible positions, its tip is above the hoop material 3 (i.e., punching or half It is possible to selectively execute a standby operation that descends only to a position where it cannot be removed), and it is possible to perform a punching (or half-punching) operation as necessary. Such switching of operation is, for example, a well-known cam mechanism 31 to 33 that is connected to each of the punches P4 to P6 and can change the descending range thereof, and a drive device (motor or the like) 34 to drive the cam mechanism. 36, and the operation of the driving devices 34 to 36 can be controlled by the controller 22.

The lower die 15, the punch P 4 to 6 are opposed to cradle 41 to 43 to the position is provided and is biased in the upper mold 13 side by these cradle 41 to 43 spring 44-46 By doing so, the pushback of the punched (or half-punched) core sheets A to C is realized.

  Further, the progressive die apparatus 11 has a stacking means composed of a die 51, a squeeze ring 52, and the like similar to the conventional progressive mold apparatus.

In the progressive die apparatus 11 having the above-described configuration, when the laminated core 1 shown in FIG. 1 is manufactured, the hoop material 3 is formed on the core sheet C positioned in the lowermost layer after the notch is formed by the punch P1. While the caulking hole b is formed by the punch P2, the caulking portion D is formed by the punch P3 on the second to fourth iron core thin plates C overlapping therewith. At this time, the inner diameter C of all the iron core thin plates C is punched by the punch P3. Next, the punch P 6 performs the punching operation, and the punches P 4 and P 5 perform the standby operation, whereby each iron core sheet C is punched (or half-punched), and then pushed back by the cradle 43. The In addition, about the iron core thin plate B and the iron core thin plate A which overlap on the iron core thin plate C, it processes similarly to the iron core thin plate C after the 2nd sheet.

Then, each core sheet A~C which is pushed back, punched each dummy sheet S and integrally including a dummy portion Da~Dc by the punch P 7. The punched dummy thin plates S are sequentially stacked in the die 51 and further pushed into the squeeze ring 52 below the die 51. In the squeeze ring 52, the dummy thin plates S are brought into close contact with other dummy thin plates S adjacent to each other by the frictional force generated on the outer peripheral surface, so that the caulking portions d (or the caulking portions d and the caulking holes b). By being engaged with each other, they are fixed to each other to form the laminate 2.

In the stacked body 2 discharged from the die 51 , the dummy portions Da to Dc are removed by a known removal device. The removal of the dummy portion is performed by pushing and expanding the groove portion R (notch portion a) outward by a known spreading mechanism provided in the removing device.

According to such a method and apparatus for manufacturing a laminated core, it is possible to easily produce a laminated core 1 in which a plurality of types of core thin plates A to C having different outer shapes are laminated. In this case, in order to stack the dummy thin plates S having the same outer shape in the stacking step, stacking means (for example, a die, a squeeze ring, and a stack from within the die) are the same as the conventional progressive mold for manufacturing a single type of core thin plate. A cradle for receiving the body) can be employed, and there is no inconvenience that the molds 13 and 15 used in the progressive mold apparatus 11 become complicated or large. In addition, since each of the iron core thin plates A to C is configured to be pushed back after being half punched or punched, the process of punching the dummy thin plate S integrally with the iron core thin plates A to C can be easily realized. Further, since the caulking holes b or the caulking portions d are provided in the iron core thin plates A to C, the dummy thin plate S can be easily fixed in the laminating step to form the laminate 2 and the dummy portion in the removing step. Even after removing Da to Dc, it is possible to easily maintain the fixed state of the iron core thin plates A to C. Moreover, since it was set as the structure which removes the dummy parts Da-Dc by pushing the groove part R formed in the laminated body 2 outside, it becomes possible to remove an unnecessary part easily in a removal 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 laminated iron core according to the present invention is not limited to the iron core thin plate described above, and can be formed from iron core thin plates having various outer shapes. In addition, although the example which provides one notch part (a) in the outer periphery of a dummy thin plate was demonstrated as 4th invention, this notch part is not one place, but it provides two or more in an appropriate place, or laminates | stacks. Depending on the outer shape of the thin plate, the size can be changed according to the width change of the dummy, the notch forming punch can be controlled to switch in and out and punched or not punched, it can be changed as necessary, Implementation is possible within the scope of the idea of the present invention.

1 is a schematic perspective view of a laminated iron core according to an embodiment of the present invention. The figure which shows the strip layout which concerns on embodiment of this invention The figure which shows the iron core thin plate from which the external shape differs stamped integrally with the dummy thin plate Explanatory drawing which shows the removal method of a dummy part Schematic configuration diagram of progressive mold device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated core 2 Laminated body 3 Hoop material 11 Progressive die apparatus 13 Upper mold 15 Lower mold 14 Stripper plate 21 Linear movement mechanism 22 Controller 31-33 Cam mechanism 34-36 Drive apparatus 41-43 Base 44-46 Spring 51 Die 52 Squeeze ring Notch portion B Caulking hole C Inner diameter D Caulking portion A to C Core thin plate Da to Dc Dummy portion E External shape P1 to P7 Punch R Groove portion S Dummy thin plate

Claims (4)

A method of manufacturing a laminated iron core obtained by laminating a plurality of types of iron core thin plates having different outer shapes,
An iron core thin plate punching step in which each of the iron core thin plates is semi-punched or punched out into a circular or oval shape from a strip-shaped thin steel plate;
A pushback step of pushing back each half-cut or punched core sheet;
A dummy thin plate punching step in which a dummy thin plate having the same outer shape larger than each of the iron core thin plates is punched from the belt-shaped thin steel plate integrally with the iron core thin plate;
A lamination step of laminating the dummy thin plates to form a laminate;
A removal step of removing unnecessary portions other than the iron core thin plates from the laminate,
Before the dummy thin plate punching step, further comprising a notch punching step of forming a notch portion only at one place on the circular outer periphery of the dummy thin plate,
In the laminating step, the dummy thin plate is laminated by aligning the positions of the notches, so that one groove portion composed of a set of the notches is formed on the outer peripheral surface of the laminate.
In the removing step, the groove portion of the laminated body is pushed outward to remove the unnecessary portion . Before the laminating step, further includes a caulking joint forming step for forming caulking joints on each of the core thin plates,
2. The method of manufacturing a laminated core according to claim 1 , wherein in the laminating step, the adjacent iron core thin plates are caulked and joined to each other by the caulking joint. An apparatus for manufacturing a laminated core in which a plurality of types of iron core thin plates having different outer shapes are laminated,
Iron core thin plate punching means for half-punching or punching each of the iron core thin plates into a circular or oval shape from a strip-shaped thin steel plate;
Pushback means for pushing back each of the iron core thin plates;
Dummy thin plate punching means for punching a dummy thin plate of the same outer shape larger than each of the iron core thin plates from the strip-shaped thin steel plate integrally with the iron core thin plate;
Laminating means for laminating the dummy thin plates to form a laminate;
Removing means for removing unnecessary portions other than each of the iron core thin plates from the laminate ,
Before the dummy thin plate is punched by the dummy thin plate punching means, further comprising means for forming a notch at only one place on the circular outer periphery of the dummy thin plate;
By laminating the dummy thin plate by aligning the positions of the notches by the laminating means, one groove formed of a set of the notches is formed on the outer peripheral surface of the laminate.
The apparatus for manufacturing a laminated iron core according to claim 1, wherein the removing means expands a groove portion of the laminated body to the outside and removes the unnecessary portion . A caulking joint forming means for forming a caulking joint on each of the iron core thin plates;
4. The laminated core manufacturing apparatus according to claim 3 , wherein in the laminating means, the adjacent iron core thin plates are caulked and joined to each other by the caulking joint.

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