CN112787474A - Method for manufacturing injection mold of stator for motor and injection mold of stator for motor - Google Patents
Method for manufacturing injection mold of stator for motor and injection mold of stator for motor Download PDFInfo
- Publication number
- CN112787474A CN112787474A CN202011220900.9A CN202011220900A CN112787474A CN 112787474 A CN112787474 A CN 112787474A CN 202011220900 A CN202011220900 A CN 202011220900A CN 112787474 A CN112787474 A CN 112787474A
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- CN
- China
- Prior art keywords
- injection mold
- stator
- motor
- main body
- body portion
- Prior art date
- Legal status (The legal status 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 status listed.)
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Links
- 238000002347 injection Methods 0.000 title claims abstract description 83
- 239000007924 injection Substances 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 238000000465 moulding Methods 0.000 claims abstract description 22
- 238000007772 electroless plating Methods 0.000 claims abstract description 12
- 238000005422 blasting Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000010030 laminating Methods 0.000 claims abstract description 4
- 238000007747 plating Methods 0.000 claims description 21
- 238000005480 shot peening Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides a method for manufacturing an injection mold of a stator for a motor and the injection mold of the stator for the motor. An injection mold (1) used when molding a motor stator, which is provided with: a core portion formed by laminating a plurality of annular electromagnetic steel sheets; and coils wound in a plurality of slots formed at predetermined intervals in an inner peripheral portion of the core, the coils being configured to: and a molding step of injecting an insulating resin into at least a gap between the core portion and the coil and curing the resin. An injection mold (1) is provided with: a long main body part (11); and a flange portion (12) extending outward from one end in the longitudinal direction of the main body portion (11), wherein electroless plating is performed after the shot blasting is performed on the outer peripheral surface (11a) of the main body portion (11) of the injection mold (1).
Description
Technical Field
The present invention relates to a method for manufacturing an injection mold (モールド type) for a motor stator used when molding (モールド molding) the motor stator, and an injection mold for a motor stator manufactured by the manufacturing method, the motor stator including: a core portion formed by laminating a plurality of annular electromagnetic steel sheets, and coils wound in a plurality of slots formed at predetermined intervals in an inner peripheral portion of the core portion, wherein: and a molding step of injecting an insulating resin into at least a gap between the core portion and the coil and curing the resin.
Background
Conventionally, it is known that an injection mold having a long main body portion and a flange portion extending outward from one end in a longitudinal direction of the main body portion is used when molding a stator for a motor (for example, see patent document 1).
In the molding of the motor stator, the core portion of the motor stator is fitted into the cylindrical frame, and the main body portion of the injection mold is inserted into the core portion so that one end in the longitudinal direction of the frame overlaps the flange portion. Next, a molten insulating resin is injected and filled into an inner cavity formed between the injection mold and the frame, and the filled insulating resin is heated and cured. After the insulating resin is cured, the molded stator for a motor is taken out of the injection mold.
However, there are some cases where the inner diameter dimensions of the electromagnetic steel sheets forming the core are unbalanced due to tolerances, and therefore, there are few: the radial dimension of the inner peripheral portion of the core portion is uniform over the entire length of the motor stator. Further, since the insulating resin is injected from one end to the other end in the longitudinal direction of the motor stator through the inside of the slot of the core portion or the like, a part of the inner peripheral surface of the insulating resin cured in the cavity, the slot or the like is closely bonded to the outer peripheral surface of the main body portion of the injection mold.
Therefore, when the main body portion of the injection mold is inserted into the core portion or the stator for the motor is taken out of the injection mold after molding, the outer peripheral surface of the main body portion of the injection mold rubs against at least a part of the inner peripheral portion of the core portion or the inner peripheral portion of the insulating resin after curing, and the main body portion of the injection mold is worn. Therefore, the injection mold of the conventional motor stator cannot sufficiently withstand repeated use.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2018-46710
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for manufacturing an injection mold of a motor stator that sufficiently withstands repeated use in molding the motor stator, and an injection mold of a motor stator manufactured by the manufacturing method.
In order to solve the above-described problems of the present invention, a method of manufacturing an injection mold for a motor stator according to the present invention is a method of manufacturing an injection mold for a motor stator used when molding the motor stator, the motor stator including: a core portion formed by laminating a plurality of annular electromagnetic steel sheets; and coils wound in a plurality of slots formed at predetermined intervals in an inner peripheral portion of the core, the coils being configured to: a molding method for injecting an insulating resin into at least a gap between a core portion and a coil and curing the resin, the molding method comprising: a long main body portion; and a flange portion extending outward from one end in the longitudinal direction of the main body portion, wherein shot peening (shot peening) is performed on the outer peripheral surface of the main body portion of the injection mold, and then electroless plating (electrolytic plating) is performed.
The injection mold for a motor stator according to the present invention is manufactured by the above-described manufacturing method for an injection mold for a motor stator, and is characterized in that a plating layer by electroless plating is formed on an outer peripheral surface of the main body portion after the shot blasting has been performed.
According to the method for manufacturing the injection mold of the stator for the motor and the injection mold of the stator for the motor of the present invention, the outer peripheral portion of the main body portion of the injection mold is work hardened by shot peening, and the friction resistance is improved. Further, since the compressive stress at the time of shot peening remains in the outer peripheral portion of the main body portion of the injection mold, the fatigue strength of the outer peripheral portion of the main body portion of the injection mold is improved. Further, since fine irregularities are formed on the outer peripheral surface of the main body portion of the injection mold, the adhesion of the plating layer formed on the outer peripheral surface of the main body portion of the injection mold, which has been subjected to shot blasting, by electroless plating is improved, and defects such as peeling of the plating layer are less likely to occur. Further, the plating layer is hard and has corrosion resistance. Therefore, when the main body portion of the injection mold is inserted into the core portion or the motor stator is taken out of the injection mold after the molding, even if the plating layer formed on the outer peripheral surface of the main body portion of the injection mold, which has been subjected to the shot peening treatment, rubs against a part of at least one of the inner peripheral portion of the core portion or the inner peripheral portion of the cured insulating resin, the wear of the main body portion of the injection mold can be suppressed. Thus, the injection mold of the stator for the motor can sufficiently withstand repeated use in molding.
Drawings
Fig. 1 is a perspective view of an embodiment of an injection mold for a motor stator according to the present invention.
Fig. 2 (a) is a schematic cross-sectional view of a state during molding, and fig. 2 (b) is a schematic cross-sectional view of a state when the motor stator is taken out of the injection mold.
Description of the reference numerals
1 … injection mould; 11 … a body portion; 11a … outer circumferential surface; 11c … plating; 12 … flange portion; 2 … stator for motor; 21 … a core; 21a … slot; 23 … coil; 3 … insulating resin.
Detailed Description
Referring to fig. 1, an injection mold 1 for a motor stator according to the present embodiment will be described. The injection mold 1 is a hollow mold, and includes: a long cylindrical body portion 11, and a flange portion 12 extending outward from one end in the longitudinal direction of the body portion 11. After the molding, a refrigerant such as air flows through the hollow portion 1a of the injection mold 1, and the motor stator can be cooled together with the injection mold 1 by the refrigerant.
The main body portion 11 and the flange portion 12 of the injection mold 1 are both made of metal, and can be integrally molded by die casting of aluminum, for example. Further, as shown in the dotted circle in fig. 1, the outer peripheral surface 11a of the main body 11 is subjected to shot blasting. The shot blasting treatment comprises the following steps: a metal working method in which a plurality of metal balls are collided with the surface of a metal product at a high speed. When the ball collides, the metal product has a collided portion formed with: fine irregularities are formed on the surface of the metal product due to the recesses caused by the plastic deformation. On the other hand, plastic deformation in the concave portion is restrained by a portion other than the impacted portion or a portion located inside the concave portion with respect to the surface portion, and compressive residual stress is generated in the impacted portion. As a result, the collided portion of the metal product after the shot blasting is hardened by the change of the metal structure accompanying the plastic deformation, and the friction resistance is improved. In addition, the fatigue strength becomes high due to the residual compressive stress. Therefore, the outer peripheral portion 11b of the body portion 11 of the injection mold 1 has improved friction resistance and fatigue strength as compared with conventional products.
In the injection mold 1, the outer peripheral surface 11a of the main body 11, which has been subjected to shot blasting, is subjected to electroless plating. Electroless plating is a plating method as follows: the plating object is immersed in the plating solution, and a film is deposited on the surface of the plating object by electrons released by oxidation of a reducing agent contained in the plating solution. The plating layer 11c as the deposited coating is hard and has corrosion resistance. Further, since fine irregularities are formed on the outer peripheral surface 11a of the main body portion 11 of the injection mold 1, the adhesion of the plating layer 11c is improved, and defects such as peeling of the plating layer 11c are less likely to occur. The main component forming the plating layer 11c is preferably nickel.
The injection mold 1 for the motor stator is manufactured by performing shot blasting on the outer peripheral surface 11a of the main body 11 and then performing electroless plating. The electroless plating includes electroless nickel plating and the like.
Next, with reference to fig. 2 (a) and (b), description will be made of: the stator 2 for a motor using the injection mold 1 shown in fig. 1 is molded. In the stator 2 for a motor, a core 21 is fitted into a cylindrical frame 22 by shrink fit or the like, and a coil 23 is wound around a plurality of slots 21a formed at predetermined intervals in an inner peripheral portion of the core 21. In the molding, the injection mold 1 is arranged such that the flange portion 12 is horizontal with the main body portion 11 facing upward, the main body portion 11 of the injection mold 1 is inserted into the core portion 21 of the motor stator 2, and one end in the longitudinal direction of the frame 22 is placed on the flange portion 12 of the injection mold 1 ((a) of fig. 2). The length of the body portion 11 of the injection mold 1 is longer than the length of the frame 22, and between the injection mold 1 and the motor stator 2, the upper end portion and the lower end portion in the longitudinal direction of the frame 22 are formed with: the cavities 4a and 4b are filled with the insulating resin 3.
Then, an ac current is output from an ac power supply (not shown) to the coil 23 of the stator 2 for the motor to heat the coil 23, and the heat is transferred to the core 21, the frame 22, the injection mold 1, and the like to preheat, and then molding is performed. In the molding, the molten insulating resin 3 is injected from the cavity 4a located at the upper end in the longitudinal direction of the frame 22, and after the cavity 4a is filled with the insulating resin 3, the cavity 4b located at the lower end in the longitudinal direction of the frame 22 is filled with the insulating resin 3 via a gap between the core 21 and the coil 23 in the slot 21a, a gap between conductors forming the coil 23, and the like. Thereafter, the motor stator 2 is heated together with the injection mold 1 in the same manner as the preheating, and the insulating resin 3 is cured.
After the insulating resin 3 is cured, a refrigerant such as air may be passed through the hollow portion 1a of the injection mold 1, and the motor stator 2 may be cooled together with the injection mold 1 by blowing the refrigerant such as air to the outer peripheral surface of the frame 22 or cooling by other methods as necessary. Next, the molded stator 2 for the motor is lifted upward and taken out of the injection mold 1 (fig. 2 (b)).
However, as described above, there may be unevenness in the inner diameter dimensions of the electromagnetic steel sheets forming the core portion 21 of the stator 2 for a motor due to tolerances, and therefore there are few: the radial dimension of the inner peripheral portion of the core 21 is uniform over the entire length of the motor stator 2. Further, since the insulating resin 3 is also filled into the cavity 4b via the cavity 4a and the inside of the slot 21a of the core 21, etc., a part of the inner peripheral surface of the cured insulating resin 3 is closely bonded to: an outer peripheral surface 11d of a plated layer 11c formed on the outer peripheral surface 11a of the main body 11 of the injection mold 1 shown in fig. 1, which has been subjected to shot peening.
However, in the injection mold 1 of the present embodiment, as described above, the outer peripheral portion 11b of the body portion 11 is work hardened by shot peening, and the friction resistance is improved. In addition, since the compressive stress at the time of the shot peening remains in the outer peripheral portion 11b of the body 11, the fatigue strength of the outer peripheral portion 11b of the body 11 is improved. Further, since the outer peripheral surface 11a of the body portion 11 of the injection mold 1 is formed with fine irregularities, the adhesion of the plating layer 11c formed by electroless plating on the outer peripheral surface 11a of the body portion 11 subjected to shot blasting is improved, and defects such as peeling of the plating layer 11c are less likely to occur. The plating layer 11c is hard and has corrosion resistance. Therefore, even when the plated layer 11c formed on the outer peripheral surface 11a of the main body portion 11 of the injection mold 1, which has been subjected to shot blasting, rubs against at least a portion of the inner peripheral portion of the core portion 21 or the inner peripheral portion of the cured insulating resin 3 when the main body portion 11 of the injection mold 1 is inserted into the core portion 21 or when the motor stator 2 is removed from the injection mold 1 after molding, the wear of the main body portion 11 of the injection mold 1 can be suppressed. Thus, the injection mold 1 of the stator 2 for the motor can sufficiently withstand repeated use in molding. Since the injection mold 1 can be used repeatedly, the manufacturing cost of the motor stator can be reduced.
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The injection mold 1 may be drawn downward to extract the molded motor stator 2 from the injection mold 1. The injection mold 1 may be provided with at least the main body portion 11 and the flange portion 12, and other parts may be modified as appropriate. The metal forming the injection mold 1 is not limited to aluminum, and similarly, the main component of the plating layer 11c formed by electroless plating is not limited to nickel.
Claims (2)
1. A method for manufacturing an injection mold for a stator for a motor, which is used when the injection mold is molded for a stator for a motor, the stator for a motor comprising: a core portion formed by laminating a plurality of annular electromagnetic steel sheets; and coils wound in a plurality of slots formed at predetermined intervals in an inner peripheral portion of the core, the coils being configured to: a molding step of injecting an insulating resin into at least a gap between the core portion and the coil and curing the resin,
it is characterized in that the preparation method is characterized in that,
the injection mold is provided with: a long main body portion; and a flange portion extending outward from one end in the longitudinal direction of the main body portion,
the outer peripheral surface of the main body of the injection mold is subjected to shot blasting and then electroless plating.
2. An injection mold of a stator for a motor is characterized in that,
the injection mold for a stator of a motor is manufactured by the method for manufacturing an injection mold for a stator of a motor according to claim 1,
a plating layer formed by electroless plating is formed on the outer peripheral surface of the main body after the shot peening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019202234A JP7412965B2 (en) | 2019-11-07 | 2019-11-07 | Method for manufacturing a mold for a stator for a motor and a mold for a stator for a motor |
| JP2019-202234 | 2019-11-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112787474A true CN112787474A (en) | 2021-05-11 |
Family
ID=75750317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011220900.9A Pending CN112787474A (en) | 2019-11-07 | 2020-11-05 | Method for manufacturing injection mold of stator for motor and injection mold of stator for motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7412965B2 (en) |
| CN (1) | CN112787474A (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3715519B2 (en) | 2000-09-05 | 2005-11-09 | 東芝産業機器製造株式会社 | Rotating electric machine and method of manufacturing rotating electric machine |
| JP2004064895A (en) | 2002-07-29 | 2004-02-26 | Seiko Epson Corp | Manufacturing method for permanent magnet, permanent magnet, motor component and motor |
| JP2014023387A (en) | 2012-07-23 | 2014-02-03 | Toyota Motor Corp | Motor and manufacturing method of the same |
| JP6171567B2 (en) | 2013-05-27 | 2017-08-02 | アイシン精機株式会社 | Method for manufacturing machine part for internal combustion engine |
| JP6754069B2 (en) | 2016-05-25 | 2020-09-09 | ユケン工業株式会社 | Mold for molding |
| JP6421153B2 (en) | 2016-09-16 | 2018-11-07 | 株式会社神戸製鋼所 | Manufacturing method of rotating electrical machine |
| JP6805093B2 (en) | 2017-02-13 | 2020-12-23 | 株式会社三井ハイテック | Manufacturing method of stator laminated iron core and stator laminated iron core |
-
2019
- 2019-11-07 JP JP2019202234A patent/JP7412965B2/en active Active
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2020
- 2020-11-05 CN CN202011220900.9A patent/CN112787474A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP7412965B2 (en) | 2024-01-15 |
| JP2021078210A (en) | 2021-05-20 |
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