JP5150952B2 - Manufacturing method of laminated iron core - Google Patents

Description

    The present invention relates to a method for manufacturing a laminated core, and more specifically, using a strip-shaped core piece formed by connecting a plurality of segment core pieces in a linearly extending shape via a connecting portion provided on the outer peripheral side, and The present invention relates to a method of manufacturing a laminated core by winding the belt-shaped core pieces in a spiral manner and by laminating them while aligning the meeting edge portions of the adjacent segment core pieces by bending deformation of the portions.

    For example, a laminated stator core (laminate core) of a drive motor is usually formed by punching and forming a stator core piece from a metal plate using a press mold device, and laminating a predetermined number of the stator core pieces and connecting them together. Manufactured by doing.

  According to such a method of manufacturing a laminated stator core, a laminated stator core with good shape accuracy can be produced, but the individual stator core pieces constituting the laminated stator core have a circular outer shape. In addition, since there is an opening for accommodating the rotor in the center, there are many parts that become scrap when punching and the material yield of the iron core plate is lowered.

  Therefore, as an example of a technique for eliminating the decrease in the material yield as described above, a strip-shaped core piece in which a plurality of segment core pieces are connected is formed by punching from a strip-shaped steel plate, and the strip-shaped core pieces are wound while being spirally wound. Provides a method of manufacturing a laminated stator core (see, for example, Patent Document 1).

  FIG. 8 shows an example of the laminated stator core manufactured by the above-described method. This laminated stator core A includes a plurality of segment core pieces S, S... Having salient poles St, St. , J ... are used to form a linear core piece W that is connected in a straight line, and the connecting portion J is bent and deformed so that the adjacent edge portions of adjacent segment core pieces S (reference symbol Se in FIG. 10) are aligned. However, the strip-shaped core pieces W are laminated while being spirally wound, and the overlapping segment core pieces S are joined together.

  As shown in FIG. 9, the segment core piece S of the strip-shaped core piece W has a split yoke portion Sy and salient poles St, St..., And the adjacent segment core pieces S are arranged on the outer peripheral side of the meeting edge portion Se. The connecting portions J are connected to each other through the connecting portions J provided, and the connecting portions J are formed by punching together with the segment core pieces S, S...

That is, as shown in FIG. 10A, the outer peripheral side punched portion Ja and the inner peripheral side punched portion Jb are punched and formed between the adjacent segment core pieces S, so that the opposite meeting edges Se, On the outer peripheral side of Se, a suitable connecting portion J sandwiched between the outer peripheral side punched portion Ja and the inner peripheral side punched portion Jb is formed.
JP 2007-228730 A

    By the way, when manufacturing the laminated stator core A, the shape accuracy (dimensional accuracy) of the connecting portion J in the above-described strip-shaped core piece W is obtained by bending the connecting portion J as shown in FIG. This is a factor that greatly affects the outer and inner diameter dimensions of the finished laminated stator core A after winding W and the important dimensions such as roundness.

  On the other hand, when the production quantity of the strip-shaped core pieces W increases due to the mass production of the laminated stator core A, the wear of the die cutter (punch / die) in the press mold apparatus for punching and forming the strip-shaped core pieces W progresses. As a result, the shape accuracy (dimensional accuracy) of the connecting portion J is reduced.

  The reduction in shape accuracy (dimensional accuracy) at the connecting portion J directly affects the bending accuracy of the adjacent segment core pieces S, S, and the laminated stator core A manufactured by winding the strip-shaped core piece W. This will reduce the shape accuracy.

  In order to suppress the deterioration of the shape accuracy of the laminated stator core A, the production of the strip-shaped core pieces W is temporarily stopped before the winding and lamination process, and the shape accuracy (dimensional accuracy) at the connecting portion J is confirmed. In addition, it is necessary to adjust the mold, which causes a disadvantage that the productivity is greatly reduced.

  Further, as described above, with the mass production of the laminated stator core A, the wear of the die blade (punch / die) in the press die apparatus proceeds, so the shape accuracy (dimensional accuracy) of the connecting portion J is maintained, In order to suppress the deterioration of the shape accuracy of the laminated stator core A, it is necessary to frequently perform maintenance such as re-polishing of the above-mentioned die cutter (punch / die), which causes a significant decrease in productivity. There was an inconvenience.

  An object of the present invention is to provide a method for manufacturing a laminated iron core that can achieve improvement in productivity and is excellent in shape accuracy in view of the above-described actual situation.

    In order to achieve the above object, a manufacturing method of a laminated core according to the invention of claim 1 is a belt-like shape formed by connecting a plurality of segment core pieces in a linearly extending shape via a connecting portion provided on the outer peripheral side. A method of manufacturing a laminated core by using an iron core piece, bending the connecting portion and aligning the meeting edge of adjacent segment core pieces, winding the strip-shaped iron core pieces in a spiral, and laminating each other, The step of forming the connecting portion in the strip-shaped core piece includes a preforming step in which the periphery of the region where the connecting portion is formed is formed into a shape that leaves a finishing allowance, and the finishing allowance is removed after this pre-forming step to remove the connecting portion And a finish forming step of forming into a desired shape.

  The method for manufacturing a laminated core according to the invention of claim 2 is characterized in that, in the method for manufacturing a laminated core according to the invention of claim 1, the finish forming step is performed by shaving.

    According to the manufacturing method of the laminated core relating to the invention of claim 1, by forming the connecting portion in the preforming step and the finish forming step, the punching load in each forming step is reduced and used in each forming step. Since the wear of the die cutter (punch / die) is suppressed, the shape accuracy (dimensional accuracy) at the connecting portion is improved.

  Thus, in order to suppress the deterioration of the shape accuracy in the laminated core, conventionally, for example, the production of the strip-shaped core pieces is temporarily stopped before the winding and laminating process, and the shape accuracy (dimensional accuracy) at the connecting portion is confirmed and adjusted. This eliminates the need for the work that has been required, thereby enabling a significant improvement in productivity.

  In addition, as described above, the wear of the die cutter (punch / die) used in each molding process is suppressed, so that the maintenance interval related to re-polishing of the die cutter (punch / die) is extended. Therefore, according to the method for manufacturing a laminated core according to the invention of claim 1, productivity can be improved and the outer diameter dimension, inner diameter dimension, and roundness and other shape dimensions are excellent. A laminated iron core can be manufactured.

  According to the method of manufacturing a laminated core according to the invention of claim 2, a press die for punching and forming a strip-shaped core piece by performing a finish forming step by shaving without particularly requiring a separate processing device. With the apparatus, the finish forming step can be carried out, so that the present invention can be easily introduced into existing production facilities.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 7 show an example in which the “manufacturing method of a laminated core” according to the present invention is applied to the manufacture of a laminated stator core in an electric motor. As shown in FIG. 1, the manufacturing is performed according to the present invention. The laminated stator core (laminated core) 1 thus formed has a form in which a predetermined number of salient poles 11t, 11t,... Protrude from the ring-shaped yoke in the radial inner direction.

  The laminated stator core 1 uses a strip-shaped core piece 10 formed by connecting a plurality of segment core pieces 11, 11... Linearly via connecting parts 12, 12. The belt-shaped core pieces 10 are stacked while being spirally wound while matching the meeting edges (symbol 11e in FIG. 5) of the adjacent segment core pieces 11, and the overlapping segment core pieces 11 are integrated. Manufactured in conjunction with.

In addition, when laminating | stacking, laminating | stacking the strip | belt-shaped iron core piece 10, the connection parts 12 in the overlapping layer are shifted and arrange | positioned in the circumferential direction.
Further, the overlapping segment core pieces 11 are joined together by using one means such as caulking, bonding, welding, etc., or using any two or more means in combination.

  As shown in FIG. 2, the strip-shaped iron core piece 10 includes a plurality of segment core pieces 11, 11... Having a divided yoke portion 11 y and salient poles 11 t, 11 t. The pieces 11 and 11 are connected to each other in a form extending linearly along the axis XX via a connecting portion 12 provided on the outer peripheral side of the meeting edge portions 11e and 11e. It is manufactured by stamping and forming a strip steel plate (magnetic steel plate) having a thickness of 0.5 mm or less.

  Further, as shown in FIG. 5 (a), the connecting portion 12 in the strip-shaped iron core piece 10 is formed by punching an outer peripheral side punched portion 12A and an inner peripheral side punched portion 12B between adjacent segment core pieces 11. Thus, the outer peripheral side of the opposing meeting edge portions 11e and 11e is formed in a mode sandwiched between the outer peripheral side punched portion 12A and the inner peripheral side punched portion 12B.

  In order to manufacture the laminated stator core 1 shown in FIG. 1 using the above-described strip-shaped core piece 10, as shown in FIGS. 3 and 4, first, in the press die apparatus D, from the strip-shaped steel plate (electromagnetic steel plate). After the strip-shaped core piece 10 is formed by punching, the strip-shaped core piece 10 is conveyed to the winding laminator M.

  Next, the strip-shaped core piece 10 fed to the winding laminating apparatus M is wound around the mandrill Mm to bend and deform the connecting portion 12, and the spirally wound strip-shaped core pieces 10 and 10 (segment core piece 11 The laminated stator core 1 is manufactured by integrally bonding them together by means of caulking or the like described above.

  Here, when the laminated stator core 1 is manufactured as described above, when the strip-shaped iron core piece 10 is punched and formed from the strip-shaped steel plate (electromagnetic steel plate) by the press mold apparatus D, first, the strip-shaped steel plate (magnetic steel plate) is formed. As shown in FIG. 6 (a), the connecting portion 12 is punched and formed between adjacent segment core pieces 11 by one or a plurality of molds installed in the press mold apparatus D while being conveyed. .. Are formed by punching the segment core pieces 11, 11... Connected between the opposite meeting edges 11 e and 11 e.

  In order to form the connecting portion 12, the inner peripheral side punched portion 12B is first punched and formed. First, as shown in FIG. 6B, the inner peripheral side preforming punch Pb1 is used to connect the connecting portion. The periphery of the region where 12 is formed is molded into a shape that leaves the finishing allowance 12Bs (preliminary molding step).

  Next, after the above-described preforming step, as shown in FIGS. 7A and 7B, the finishing allowance 12Bs described above is removed by shaving using the inner peripheral side finish forming punch Pb2, and the connecting portion 12 is removed. To the desired shape (finish molding process).

  Similarly, in order to form the connecting portion 12, the outer peripheral side punched portion 12A is punched and formed following the formation of the inner peripheral side punched portion 12B. First, as shown in FIG. Using the side pre-forming punch Pa1, the periphery of the region where the connecting portion 12 is formed is formed into a shape leaving the finishing allowance 12As (pre-forming step).

  Next, after the above-described pre-forming step, as shown in FIGS. 7A and 7B, the finishing allowance 12As described above is removed by shaving using the outer peripheral side finish forming punch Pa2, and the connecting portion 12 is removed. Mold to the desired shape (finish molding process).

  Here, as described above, after forming the connecting portion 12 between the adjacent segment core pieces 11 by punching the inner peripheral side punched portion 12B and punching the outer peripheral side punched portion 12A, the connecting portion 12 is formed. The procedure of punching and forming the segment core pieces 11, 11... Connected in this way is effective in improving the punching accuracy of each part in the situation where the punching stages of the molds in the press mold apparatus D are adjacent to each other.

  Further, the dimension s of the finishing allowances 12As and 12Bs described above is arbitrarily set based on the thickness of the strip steel plate (electromagnetic steel plate) and the like, and depends on the thickness of the strip steel plate (electromagnetic steel plate). As described above, in this embodiment using a strip steel plate (electromagnetic steel plate) having a thickness of 0.5 mm or less, it is preferable to set the dimension s of the finishing allowances 12As and 12Bs to 0.1 to 0.15 mm.

  Incidentally, when forming the connecting portion 12, the forming order of the outer peripheral side punched portion 12A and the inner peripheral side punched portion 12B can be arbitrarily set depending on the mold configuration of the press mold apparatus D or the like.

  That is, as shown in the examples, after performing the preforming step and the finish molding step of the inner peripheral side punched portion 12B, in addition to performing the preforming step and the finish molding step of the outer peripheral side punched portion 12A, Contrary to the embodiment, after performing the preforming step and the finish molding step of the outer peripheral side punched portion 12A, the preforming step and the finish molding step of the inner peripheral side punched portion 12B may be performed.

  Furthermore, after performing the preforming step of the outer peripheral side punched portion 12A and the preforming step of the inner peripheral side punched portion 12B, the finish forming step of the outer peripheral side punched portion 12A and the finish forming step of the inner peripheral side punched portion 12B. Or after performing the preforming step of the outer peripheral side punched portion 12A and the preforming step of the inner peripheral side punched portion 12B at the same time, the finish forming step of the outer peripheral side punched portion 12A and the inner peripheral side punched portion 12B It is also possible to carry out the finish forming step at the same time.

  According to the above-described configuration, in the process of manufacturing the laminated stator core 1, when the strip-shaped core piece 10 is punched and formed, the connecting portion 12 is formed separately in the preforming process and the finishing molding process, thereby forming each molding. Since the punching load in the process is reduced and the wear of the die cutter (punch / die) used in each molding process is suppressed, the shape accuracy (dimensional accuracy) in the connecting portion 12 is improved.

  Thus, in order to suppress the deterioration of the shape accuracy in the laminated stator core, conventionally, the production of the strip-shaped core pieces is temporarily stopped before the winding lamination process, the shape accuracy (dimensional accuracy) in the connecting portion is confirmed, and the mold Thus, it is possible to achieve a significant improvement in productivity in the manufacture of the laminated stator core 1.

  Further, as described above, since the wear of the die cutter (punch / die) used in the preforming step and the finish molding step is suppressed, maintenance related to re-polishing of the die cutter (punch / die) is performed. The interval can be lengthened, and thus it is possible to achieve a significant improvement in productivity with respect to the manufacture of the laminated stator core 1.

  In addition, according to the above-described configuration, when the laminated stator core 1 is manufactured, the strip-shaped core piece 10 is punched and formed without particularly requiring a separate processing device by performing a finish forming step by shaving. The press molding apparatus D for performing the above-described finishing molding step enables the present invention to be easily introduced into existing manufacturing equipment.

  Here, in the above-described embodiment, for the purpose of improving the shape accuracy (dimensional accuracy) of the laminated stator core 1, shaving is employed in the finish forming process of the connecting portion 12. For example, the configuration of the semiconductor device It is clear that the manufacturing method of lead frame, which is an element, is completely different from the method of shaving to prevent burrs from remaining (see Japanese Patent Application Laid-Open No. 02-202045).

  However, although the purpose is different from the manufacture of the lead frame, in the above-described embodiment, the connecting portion 12 is formed by the finish forming step by forming the connecting portion 12 by performing the finish forming step after the preforming step. Since the burrs and sagging at the edges of the belt are removed, no inadvertent gaps are generated between the strip-shaped core pieces 10 (segment core pieces 11) that are stacked while being wound. Needless to say, the improvement in performance required for the laminated stator core 1 such as the electrical characteristics and the like can be achieved.

  In addition, in the Example mentioned above, although the finishing shaping | molding process is implemented by one shaving process, the finishing shaping | molding process which makes a connection part the expected shape by giving a shaving process in multiple times. It is also possible to configure.

  In the above-described embodiments, the finish forming process is performed by shaving. For example, “zero clearance processing”, “broching”, “honing”, etc. using a press mold apparatus are performed. It is also possible to carry out the finish forming step using an appropriate processing method other than the above.

  Furthermore, in the above-described embodiments, an example in which the present invention is applied to the manufacture of a laminated stator core (stator) in an electric motor has been shown.Of course, also regarding the production of a laminated rotor core (rotor) in an electric motor, Needless to say, the present invention can be applied very effectively.

(a) And (b) is the top view and side view of the laminated iron core manufactured in accordance with this invention. The top view which shows the strip | belt-shaped core piece provided to the manufacturing method of the laminated core concerning this invention. The conceptual diagram which shows the manufacturing equipment for enforcing the manufacturing method of the laminated core concerning this invention. The top view of the strip | belt-shaped core piece which showed notionally the aspect which manufactures a laminated core in the manufacturing equipment of FIG. (a) And (b) is a principal part top view which shows the condition at the time of winding the strip | belt-shaped iron core piece shown in FIG. (a) And (b) is a principal part top view which shows the manufacturing process of the strip | belt-shaped iron core piece shown in FIG. (a) And (b) is a principal part top view which shows the manufacturing process of the strip | belt-shaped iron core piece shown in FIG. (a) And (b) is the top view and side view which show the conventional laminated iron core. The top view which shows the strip | belt-shaped core piece provided to manufacture of the conventional laminated core. (a) And (b) is a principal part top view which shows the condition at the time of winding the strip | belt-shaped iron core piece shown in FIG.

Explanation of symbols

1 ... Laminated stator core (laminated core),
10 ... strip-shaped iron core piece,
11 ... segment core piece,
11y ... Yoke part,
11t Magnetic pole part,
11e: Meeting edge,
12 ... connection part,
12A ... Peripheral punched part,
12B ... Inner peripheral side punching part,
12As, 12Bs ... Finishing fee,
Pa1 ... outer peripheral side preforming punch,
Pb1 ... inner peripheral side preforming punch,
Pa2: Finishing punch on the outer peripheral side,
Pb2 ... Inner peripheral side finishing molding punch,
D ... Press mold equipment,
M: winding lamination apparatus.

Claims (2)

Association of adjacent segment core pieces by using a strip-shaped core piece formed by connecting a plurality of segment core pieces in a linearly extending shape via a connecting portion provided on the outer peripheral side, and bending and deforming the connecting portion A method of manufacturing a laminated core by laminating the strip-shaped core pieces in a spiral manner while aligning the edges,
The forming step of the connecting portion in the strip-shaped core piece,
A preforming step of molding the periphery of the region where the connecting portion is formed into a shape that leaves a finishing allowance;
A finish forming step of removing the finishing allowance after the preforming step and forming the connecting portion into an expected shape,
A method for producing a laminated iron core, comprising: The method for manufacturing a laminated core according to claim 1, wherein the finish forming step is performed by shaving.

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