WO2018066518A1 - Procédé de fabrication d'une pièce de noyau - Google Patents

Procédé de fabrication d'une pièce de noyau Download PDF

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Publication number
WO2018066518A1
WO2018066518A1 PCT/JP2017/035833 JP2017035833W WO2018066518A1 WO 2018066518 A1 WO2018066518 A1 WO 2018066518A1 JP 2017035833 W JP2017035833 W JP 2017035833W WO 2018066518 A1 WO2018066518 A1 WO 2018066518A1
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WO
WIPO (PCT)
Prior art keywords
core piece
bending
iron core
manufacturing
reverse
Prior art date
Application number
PCT/JP2017/035833
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English (en)
Japanese (ja)
Inventor
広一 荒川
裕介 蓮尾
Original Assignee
株式会社三井ハイテック
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社三井ハイテック filed Critical 株式会社三井ハイテック
Priority to CN201780061887.7A priority Critical patent/CN109792195B/zh
Publication of WO2018066518A1 publication Critical patent/WO2018066518A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

Definitions

  • the present invention relates to a method for manufacturing an iron core piece constituting a laminated iron core.
  • the armature (stator and rotor) of a rotating electrical machine is formed by stacking iron core pieces.
  • the iron core piece is manufactured by punching out a plate-like material called an electromagnetic steel plate or a silicon steel plate (hereinafter simply referred to as “material” in the present specification).
  • the stator of a rotating electric machine is generally formed in a cylindrical shape.
  • the rotor of the rotating electrical machine is formed in a cylindrical shape as a whole, and is arranged concentrically inside the stator.
  • an iron core piece constituting such a stator has an annular plane shape.
  • winding such an integrated laminated core has a problem of poor workability. Therefore, in recent years, the core pieces are divided in the circumferential direction, and the divided core pieces (hereinafter referred to as “divided core pieces”) are stacked to form a divided core. Then, it is a general practice to form a stator by winding each of the split cores and then joining the split cores to each other.
  • stator composed of the split cores has the advantage that it is easier to manufacture and has higher productivity than the stator composed of an integral core.
  • FIG. 6 of Patent Document 1 when the divided core pieces are manufactured, a plurality of patterns of the divided core pieces are arranged in an annular shape on the surface of the material. And the pattern of the iron core piece which comprises a rotor is arrange
  • the divided core piece that has been bent is bent back, that is, the bending that has occurred in the divided core piece is corrected to make the divided core piece flat.
  • this processing is performed by pressing a material while sandwiching a material including a split core piece with bending between a flat die and a stripper plate.
  • the processing method for flattening the bending of the member generated by the cutting and bending process between the flat die and the stripper plate is referred to as “bending back”, and “bending back” is referred to as “bending back”.
  • the process to be performed is referred to as a “bending back process”.
  • the members to be subjected to “cut bending” and “bending back” are not limited to the divided iron core pieces.
  • “cut and bend” and “bend back” are also performed on “caulking blocks” that are temporarily joined together and removed after completion of the split iron core ( Patent Document 3, FIG. 5). That is, “cut-bending” and “bending-back” may be performed on a member attached to the iron core piece and finally separated from the laminated iron core.
  • a member that has been bent as a result of cutting and bending is subjected to a bending back process to flatten the member.
  • the bending of the member may not be sufficiently corrected only by the bending back process.
  • size of the bending which remains in a member after a bending back process is not uniform, but a dispersion
  • the present invention has been made in view of such circumstances, and corrects the bending generated in the iron core piece or a member attached to the iron core piece at the time of cutting and bending, so that the iron core piece that is sufficiently flat in practice or
  • An object of the present invention is to provide a method for manufacturing an iron core piece capable of producing a member attached to the iron core piece.
  • a method of manufacturing an iron core piece according to the present invention is a method of manufacturing an iron core piece by punching a plurality of members from a single material, and is adjacent to one member and the member.
  • the reverse bending step may be performed without passing through other steps.
  • the first bending back step of correcting the bending of the member and flattening the member is performed, and after the first bending back step, the member is Performing a reverse bending step of bending the member in a direction opposite to the direction bent in the cutting and bending step, and applying a reverse bending to the member; correcting the bending of the member after the reverse bending step; You may make it perform the 2nd bending back process which makes flat.
  • the reverse bending step may be performed by placing the material on a die, and the die may include a protruding portion that protrudes from a placement surface on which the material is placed.
  • the die may include an advancing / retracting member that advances / retreats with respect to the material.
  • the reverse bending step is performed by placing a stripper plate on the material, and a portion of the stripper plate corresponding to the protrusion or the advancing / retracting member is spring-supported by another portion of the stripper plate.
  • the other part may be advanced or retracted.
  • the reverse bending step is performed by placing a stripper plate on the material, and a through-hole penetrating the stripper plate is provided in a portion of the stripper plate corresponding to the protrusion or the advance / retreat member. May be.
  • the reverse bending step is performed by placing a stripper plate on the material, and a recess in which the portion of the iron core piece to be reversely bent is accommodated in the portion of the stripper plate corresponding to the protrusion or the advance / retreat member. May be formed.
  • the reverse bending step may be performed while the material is placed on the stage where the cutting and bending step is performed.
  • the cutting and bending process is performed by a press device including a punch and a pushback slider, and the punch is advanced toward the material.
  • the reverse bending process is performed after the cutting and bending process is completed. May be moved backward from the material, and then the pushback slider may be advanced toward the material.
  • the edge of the end surface of the pushback slider When the pushback slider is moved forward toward the material, the edge of the end surface of the pushback slider first comes into contact with the portion closest to the boundary line of the material, and then the pushback slider is moved forward.
  • the end surface may be provided with an inclination such that a portion of the end surface that is continuous with the edge sequentially contacts the material.
  • the bending that occurs in the iron core piece or a member attached to the iron core piece is corrected during the cutting and bending process, and the iron core piece is attached to a sufficiently flat iron core piece or iron core piece in practice.
  • a member can be manufactured.
  • FIG. 1 It is a top view which shows arrangement
  • FIG. 1 is a figure which shows the processing sequence of the stator core piece in the manufacturing method of the core piece concerning the 1st Embodiment of this invention in time series.
  • (A)-(d) is a figure which shows the change of the shape of the stator core piece in the manufacturing method of the iron core piece which concerns on the 2nd Embodiment of this invention in time series.
  • FIG. 1 is a plan view showing the arrangement of member patterns on the surface of a material 1 that is a processing target of each embodiment of the present invention described below.
  • the material 1 is a thin plate of an electromagnetic steel plate.
  • patterns of 12 stator core pieces 2 (2a to 2l) are annularly arranged on the surface of the material 1.
  • the stator core pieces 2a to 2l are laminated together with the stator core pieces 2a to 2l punched from the other materials 1, respectively, and constitute twelve divided cores (not shown).
  • Each of the 12 divided iron cores is wound. After the winding is performed, the coils are again arranged in the order of a to l and joined together to form a stator of an electric motor (not shown).
  • the pattern of the rotor core pieces 3 is arranged at the center of the pattern of the stator core pieces 2a to 2l arranged in an annular shape.
  • the rotor core piece 3 is a member that is laminated together with the rotor core piece 3 punched from the other material 1 and constitutes a stator core (not shown).
  • a portion sandwiched between two adjacent teeth T, that is, a portion denoted by S in FIG. 1 is called a slot, and a stator is formed by joining divided iron cores provided with windings. In this case, a space for accommodating the winding is formed.
  • the stator core pieces 2a to 2l and the rotor core piece 3 are roughly punched from the material 1 following the following steps. That is, the rotor core piece 3 is first punched from the material 1 and separated from the material 1. Next, the outline of the slot S inside the stator core pieces 2a to 2l of the material 1 is punched out. Then, the boundary line 4 that divides the stator core pieces 2a to 2l is cut out. Further, the outline of the tip (inside of the ring) of the teeth T inside the stator core pieces 2a to 2l is punched out. Finally, the stator core pieces 2a to 2l are separated from the material 1 by punching out the outer contour of the stator core pieces 2a to 2l (outside of the ring).
  • the cutting and bending process described above is performed.
  • a punch (not shown) is pressed against the stator core piece 2b.
  • a part of the stator core piece 2b is bent in the vicinity of the boundary line 4.
  • bending back processing and reverse bending processing are performed.
  • the manufacture of the core piece according to the embodiment of the present invention will be described by taking, as an example, the cutting and bending process for cutting out the boundary line 4 between the stator core piece 2a and the stator core piece 2b and the reverse bending process performed thereafter. The method will be described in detail.
  • the stator core piece 2b is manufactured through a process as shown in FIG. First, as shown in FIG. 2 (a), the material 1 is sandwiched between a die 5 and a stripper plate 6 attached to a pressing device (not shown).
  • the pressing device includes a punch 7 that moves forward and backward with respect to the material 1.
  • the punch 7 is pushed down (advanced toward the material 1) and pressed against the stator core piece 2b. .
  • the stator core piece 2b is cut and bent, and the boundary line 4 between the stator core piece 2a (material 1) and the stator core piece 2b is cut out as shown in FIG.
  • the material 1 is moved between the die 5 having the protrusion 5a and the stripper plate 6 having the recess 6a as shown in FIG. 2 (d).
  • the protrusion 5a of the die 5 is provided so as to protrude from the placement surface on which the material 1 is placed and to come into contact with a portion where the downward bending of the stator core piece 2b occurs.
  • the recess 6 a of the stripper plate 6 is provided at a portion corresponding to the protrusion 5 a of the die 5.
  • the said press apparatus is operated and the raw material 1 is pressed as shown in FIG.2 (e).
  • the stator core piece 2b bent downward is pushed by the protrusion 5a of the die 5 and bent upward.
  • the level difference h generated therebetween is less than 50% of the thickness of the material 1. More preferably, the step h should be less than 10% of the thickness of the material 1. Ideally, it is desirable that the level difference h becomes 0 when the pressurization by the pressing device is released after the reverse bending process is completed, that is, as shown in FIG.
  • the material 1 is moved between a flat die 5 and a flat stripper plate 6 as shown in FIG. Then, the said press apparatus is operated and the raw material 1 is pressed as shown in FIG.2 (h).
  • the bending back process is completed, and the manufacturing method of the core piece according to the first embodiment is completed.
  • the stator core piece 2b is flat.
  • other processes for example, a process of cutting out another outline of the stator core piece 2 and a process of punching out the stator core piece 2 are performed.
  • stage a place where the material 1 is held and processed is generally called a “stage”.
  • the material 1 is sequentially conveyed between stages, and predetermined processing is performed in each stage.
  • predetermined processing is performed in each stage.
  • the cutting and bending process, the reverse bending process, and the bending return process are performed on separate stages.
  • Each stage is provided with a die 5 and a stripper plate 6 dedicated to that stage (process).
  • the reverse bending process is performed without passing through other processes after the cutting and bending process and the bending back process is performed at the end is shown, but the present invention is not limited thereto.
  • the bending back process may be performed after the cutting and bending process, the reverse bending process may be performed thereafter, and finally the bending back process may be performed again.
  • FIG. 3A is a diagram illustrating a state of the material 1 after completion of the cutting and bending process, and corresponds to FIG. 2C of the first embodiment.
  • the material 1 shown in FIG. When the bending back process is performed, the downward bending of the stator core piece 2b decreases as shown in FIG. After that, when the material 1 is subjected to reverse bending, the stator core piece 2b is bent upward as shown in FIG. Finally, when the bending back process is performed again, as shown in FIG. 3D, the stator core piece 2b is practically sufficiently flat. The manufacturing method of the iron core piece according to the second embodiment is thus completed.
  • the stripper plate 6 used in the reverse bending process is not limited to the one having such a recess 6a.
  • Fig.4 (a) you may make it provide the through-hole 6b which penetrates the stripper plate 6.
  • FIG. The through hole 6b of the stripper plate 6 is provided at a portion corresponding to the protrusion 5a provided in the die 5.
  • the portion of the stator core piece 2b that is pushed upward and bent upward by the protrusion 5a of the die 5 is housed in the through hole 6b.
  • a slider 6c that can move forward and backward with respect to the stripper plate 6 may be provided, and a spring 6d may be bridged between the stripper plate 6 and the slider 6c.
  • the slider 6 c of the stripper plate 6 is provided at a portion corresponding to the protrusion 5 a provided in the die 5.
  • the slider 6c is configured to be flush with the stripper plate 6 in the state shown in FIG. 4B that is not used for reverse bending. When the stator core piece 2b is bent upward in the reverse bending process, the slider 6c is pushed upward by the stator core piece 2b.
  • the die 5 having the protrusion 5a in the reverse bending step, the die 5 having the protrusion 5a is used, the protrusion 5a is pressed under the stator core piece 2b, and the stator core piece 2b is bent upward.
  • An example is shown.
  • the die 5 used in the reverse bending process is not limited to a structure having such a protrusion 5a.
  • a pusher pin 5 b that can be raised and lowered with respect to the die 5 may be provided in the die 5.
  • the pusher pin 5 b is driven by an actuator (not shown) and moves up and down with respect to the die 5.
  • the material 1 is placed in a state where the pusher pin 5b is lowered and the die 5 is flattened. And after pinching
  • the pusher pin 5 b corresponds to an advancing / retracting member that advances / retreats with respect to the material 1.
  • the material 1 was cut and bent using the dedicated die 5 and the stripper plate 6. Thereafter, the material 1 was transferred onto another die 5, and the material 1 was subjected to reverse bending using the other die 5 and the stripper plate 6. That is, the example in which the cutting and reverse bending steps are performed using separate dies 5 and stripper plates 6 is shown. This shows an example in which the cutting and reverse bending steps are performed on separate stages, but the method of manufacturing the core piece according to the present invention is not limited to these. For example, the cutting and reverse bending steps may be performed on the same stage. That is, the cutting and bending steps and the reverse bending step may be performed using the same die 5 and stripper plate 6. In the fifth embodiment, an example will be described in which the cutting and bending steps are continuously performed while the material 1 is placed on the same die 5.
  • FIG. 6 is a diagram showing the configuration of the press device 8 used in the fifth embodiment.
  • the press device 8 includes an upper die 8a and a lower die 8b.
  • the upper mold 8a is driven by a drive device (not shown) so as to advance and retreat (elevate) with respect to the lower mold 8b.
  • a punch 7 is attached to the upper die 8a so as to be able to advance and retract.
  • the punch 7 is a member that pushes and bends the material 1 from above and is driven by an actuator (not shown).
  • a pushback slider 9 is attached to a portion facing the punch 7 of the upper die 8a so as to be able to advance and retreat.
  • the pushback slider 9 is a member that reversely bends the material 1 by pressing the material 1 from below, and is driven by an actuator (not shown).
  • the material 1 is sandwiched between the die 5 and the stripper plate 6 and placed on the lower mold 8b.
  • the punch 7 is a kind of cutting blade.
  • the lower surface of the punch 7 is inclined so that the left side in FIG. 6 is lowered and the right side is raised.
  • An edge 7 a is formed at the lower left end of the punch 7. Therefore, when the punch 7 is lowered, the edge 7 a contacts the material 1 to shear the material 1. As a result, the boundary line 4 is formed at the part where the edge 7a abuts.
  • the portion of the material 1 that contacts the lower surface of the punch 7 is bent along the inclination of the lower surface of the punch 7. That is, the portion of the material 1 with which the punch 7 abuts is bent down so that the side closest to the boundary line 4 is pushed down the lowest and becomes higher as the distance from the boundary line 4 increases.
  • the upper surface of the pushback slider 9, that is, the end surface in contact with the material 1, has an inclination in which the left side rises upward and the right side falls downward in FIG.
  • the edge 9 a of the end surface of the pushback slider 9 is at a position facing the edge 7 a of the punch 7. Therefore, when the pushback slider 9 is advanced (raised) toward the material 1, the edge 9 a first contacts the portion closest to the boundary line 4 of the material 1. Thereafter, as the pushback slider 9 is further advanced (raised), a portion continuing to the edge 9a of the end surface of the pushback slider 9 is located farther from the boundary line 4 than the portion where the edge 9a of the material 1 is in contact. Sequentially contact the material 1.
  • the portion of the material 1 with which the pushback slider 9 abuts is bent up so that the side closest to the boundary line 4 is lifted highest and becomes lower as the distance from the boundary line 4 increases. That is, the portion of the material 1 with which the pushback slider 9 abuts is bent in the opposite direction to the cutting and bending.
  • the cutting and reverse bending processes by the press device 8 are executed according to the procedure shown in FIG.
  • FIG. 7B the punch 7 is lowered and pressed against the material 1 to perform cutting and bending. As a result, the stator core piece 2b is bent downward.
  • FIG. 7C the punch 7 is raised and separated from the stator core piece 2b.
  • FIG. 7A the upper die 8a is lowered, and the material 1, the die 5 and the stripper plate 6 are sandwiched between the upper die 8a and the lower die 8b and fixed to the pressing device 8.
  • the punch 7 is in the raised position and the pushback slider 9 is in the lowered position.
  • FIG. 7B the punch 7 is lowered and
  • the pushback slider 9 is raised to push up the stator core piece 2b, and reverse bending is performed.
  • the material 1 is held between the die 5 and the stripper plate 6, that is, the die bending process and the reverse bending process are performed without exchanging the die 5 and the stripper plate 6. Can be carried out continuously. Therefore, the work time concerning manufacture of an iron core piece can be shortened.
  • the reverse bending process is performed between the cutting and bending processes, and the stator core piece 2b that has been pushed and bent is bent in the reverse direction. For this reason, in the bending back process, the stator core piece 2b can be bent back sufficiently practically. That is, the stator core piece 2b that is practically sufficiently flat can be manufactured.
  • the technical scope of the present invention is not limited by the above embodiments. The present invention can be freely applied, modified or improved within the scope of the technical idea shown in the claims.
  • the bending back process is essential in the method for manufacturing the core piece according to the present invention. This is not a process.
  • the bending back process is essential in the method for manufacturing the core piece according to the present invention. This is not a process.
  • the bending back process when the magnitude of the bending in the reverse bending step is adjusted and the pressurization by the press device 8 is released after the reverse bending step is completed, that is, when the step shown in FIG. If h is set to 0, the subsequent bending back process (process) becomes unnecessary.
  • FIG. 2 (f), etc. an example in which bending remains in the material 1 when the pressurization by the press device 8 is released after the reverse bending process is completed is shown. That is, an example has been shown in which “backward bending” given to the material 1 in the reverse bending process occurs in the plastic region.
  • the manufacturing method of the iron core piece according to the present invention is not limited to the one in which “bending in the reverse direction” occurs in the plastic region. “Reverse bending” may occur in the elastic region.
  • the step h is 0 when the pressurization by the pressing device 8 is released after the reverse bending process is completed, that is, as shown in FIG. It may be what becomes.
  • the stator core piece 2 was illustrated as a specific example of the member reversely bent, in this invention, the member used as the object of reverse bending is in the stator core piece 2. It is not limited. That is, the member is not limited to a member that is laminated to form a stator.
  • the member may be a member (rotor core piece) that is laminated to form a rotor.
  • this member is not limited to the member which finally comprises a laminated iron core.
  • the member may be a member attached to the iron core piece and separated from the laminated iron core after the laminated iron core is completed, that is, a member such as a “caulking block” described in Patent Document 3. .
  • the armature constituted by the iron core piece manufactured by the iron core piece manufacturing method according to the present invention is not limited to the armature constituting the motor.
  • the armature constituted by the iron core piece manufactured by the iron core piece manufacturing method according to the present invention may be, for example, an armature constituting a generator.
  • stator core piece 2 and the rotor core piece 3 shown in FIG. 1 are examples, and the technical scope of the present invention is not limited by these.
  • shape of the boundary line 4 is also an example.
  • the set of the die 5 and the stripper plate 6 used in each stage (process) is illustrated as being physically separated.
  • the set of 6 is illustrated as being physically separated.
  • the die and stripper plate used in the practice of the present invention are not limited to such a configuration.
  • the die 5 and the stripper plate 6 used in each stage (process) may be physically integrated.
  • positioned, and the stripper plate 6 corresponding to it may be sufficient.
  • the material 1 is transferred from one stage arranged on the die 5 to another stage arranged on the same die 5 (see, for example, Japanese Patent Application Laid-Open No. 2004-23964, FIGS. 7 and 8).
  • stator core piece 2b is bent downward in the cutting and bending process, and the stator core piece 2b is bent upward in the reverse bending process, but the bending direction may be reversed. good. That is, the stator core piece 2b may be bent upward in the cutting and bending process, and the stator core piece 2b may be bent downward in the reverse bending process.
  • the bending that occurs in the iron core piece or a member attached to the iron core piece is corrected during the cutting and bending process, and the iron core piece is attached to a sufficiently flat iron core piece or iron core piece in practice.
  • a member can be manufactured.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une pièce de noyau qui permet de fabriquer une pièce de noyau ou un élément appartenant à une pièce de noyau qui est suffisamment plat pour une utilisation pratique. Ce procédé de fabrication d'une pièce de noyau, dans lequel des pièces de noyau sont fabriquées par poinçonnage d'une pluralité d'éléments à partir d'une seule feuille d'un matériau (1), présente : une étape d'incision dans laquelle une ligne de limite (4) est formée entre une pièce de noyau de stator (2a) et une autre pièce de noyau de stator (2b) adjacente à la pièce de noyau de stator (2a) ; et une étape de pliage inverse dans laquelle, après l'étape d'incision, la pièce de noyau de stator (2b) est pliée dans la direction opposée à la direction dans laquelle elle a été pliée lors de l'étape d'incision, ce qui permet d'obtenir un pliage dans la direction inverse dans la pièce de noyau de stator (2b).
PCT/JP2017/035833 2016-10-05 2017-10-02 Procédé de fabrication d'une pièce de noyau WO2018066518A1 (fr)

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CN201780061887.7A CN109792195B (zh) 2016-10-05 2017-10-02 铁芯片的制造方法

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JP2016-197069 2016-10-05
JP2016197069A JP6761319B2 (ja) 2016-10-05 2016-10-05 鉄心片の製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220166295A1 (en) * 2019-03-28 2022-05-26 Nidec Corporation Stator core plate manufacturing method, stator core plate, stator core, and mold

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JP2004357349A (ja) * 2003-05-27 2004-12-16 Nakamura Mfg Co Ltd 鉄心片の製造方法
JP2005318763A (ja) * 2004-04-30 2005-11-10 Mitsui High Tec Inc 積層鉄心の製造方法および金型装置
JP2011239591A (ja) * 2010-05-11 2011-11-24 Mitsui High Tec Inc 積層鉄心及びその製造方法
WO2016076321A1 (fr) * 2014-11-14 2016-05-19 株式会社三井ハイテック Noyau feuilleté et son procédé de fabrication

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Publication number Priority date Publication date Assignee Title
JP3954595B2 (ja) * 2004-04-30 2007-08-08 株式会社三井ハイテック 積層鉄心の製造方法および金型装置
JP2011256949A (ja) * 2010-06-09 2011-12-22 Yutaka Giken Co Ltd ブレーキディスクの製造方法及びブレーキディスク
JP5860555B2 (ja) * 2015-01-26 2016-02-16 株式会社三井ハイテック 積層鉄心の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004357349A (ja) * 2003-05-27 2004-12-16 Nakamura Mfg Co Ltd 鉄心片の製造方法
JP2005318763A (ja) * 2004-04-30 2005-11-10 Mitsui High Tec Inc 積層鉄心の製造方法および金型装置
JP2011239591A (ja) * 2010-05-11 2011-11-24 Mitsui High Tec Inc 積層鉄心及びその製造方法
WO2016076321A1 (fr) * 2014-11-14 2016-05-19 株式会社三井ハイテック Noyau feuilleté et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220166295A1 (en) * 2019-03-28 2022-05-26 Nidec Corporation Stator core plate manufacturing method, stator core plate, stator core, and mold

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CN109792195A (zh) 2019-05-21
JP6761319B2 (ja) 2020-09-23
JP2018061344A (ja) 2018-04-12

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