WO2024063298A1 - Apparatus for resin molding of rotor core magnet - Google Patents

Apparatus for resin molding of rotor core magnet Download PDF

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Publication number
WO2024063298A1
WO2024063298A1 PCT/KR2023/010811 KR2023010811W WO2024063298A1 WO 2024063298 A1 WO2024063298 A1 WO 2024063298A1 KR 2023010811 W KR2023010811 W KR 2023010811W WO 2024063298 A1 WO2024063298 A1 WO 2024063298A1
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WO
WIPO (PCT)
Prior art keywords
rotor core
laminated rotor
laminated
magnet
molten resin
Prior art date
Application number
PCT/KR2023/010811
Other languages
French (fr)
Inventor
Man Dol IM
Original Assignee
Bmc Co., Ltd.
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.)
Filing date
Publication date
Application filed by Bmc Co., Ltd. filed Critical Bmc Co., Ltd.
Publication of WO2024063298A1 publication Critical patent/WO2024063298A1/en

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Classifications

    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • 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
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

  • the present invention relates to an injection molding apparatus having multiple cavities for fixing a magnet to a rotor core of a motor used in a driving motor for electric vehicles. More specifically, the present invention relates to an apparatus for molding a magnet of a rotor core of a driving motor for electric vehicles having multiple cavities, capable of improving reliability of the apparatus for molding a magnet having multiple cavities to increase production efficiency, and reducing adhesion defects in rotor cores to improve the quality of rotor cores, by molding a magnet inserted into a rotor core manufactured by laminating laminar members with a molten resin to be fixed and simultaneously filling the molten resin into a molten resin filling space of the laminated rotor core.
  • a laminated rotor core is manufactured by sequentially punching slots, teeth, etc., on a strip supplied to a progressive die to continuously form core sheets of laminar member, laminating laminar members having a finally punched shape in a predetermined number, and adhering the same.
  • an embossing laminating method for forming embossings on each laminar member and compressing the embossings for coupling when laminating the laminar members is known as a method for adhering laminar members.
  • a plurality of injection resin material filling holes are arranged in the inner circumference and a plurality of magnet insertion holes for inserting magnets are arranged close to the outer circumferential surface.
  • Korean Patent No. 10-2214753 discloses a technique for filling a resin adhesive, an injection molten resin, into a gap between the magnet insertion hole and the circumference of the magnet, and curing and fixing the same.
  • the above prior art provides an epoxy mold compound (EMC) mold for fixing magnets of a motor for electric vehicles which automatically injects an injection resin material, EMC, into a mold to prevent separation of the magnets inserted into magnet insertion holes in a rotor core of a motor for electric vehicles from the magnet insertion holes, thereby reducing defects caused by manual operation, and injects the EMC into the magnet insertion holes of the motor core into which the magnets are inserted, thereby preventing separation of the magnets over time and also improving productivity because the EMC is injected into the mold.
  • EMC epoxy mold compound
  • Injection material filling holes and magnet insertion holes are formed using the EMC mold for fixing magnets.
  • the injection resin material is filled into the injection material filling holes and into the gaps between the magnet insertion holes and the circumferences of the magnets inserted into the magnet insertion holes in the laminar member, while laminar members having the magnets inserted into the magnet insertion holes are laminated. Thereby, the magnets can be firmly fixed by the injection resin material.
  • the prior art relates to a molding apparatus having one cavity, which leads to significantly low productivity of rotor cores and an increase in the costs for manufacturing rotor cores.
  • the prior art does not mention a feature of injecting a molten resin for a plurality of rotor cores having different diameters, and thus it cannot be applied to a molding apparatus having multiple cavities.
  • the strip a base material of laminar members
  • laminar members do not have the same thickness, and thus laminated rotor cores of a motor which are placed between the upper mold and the lower mold do not have the same height, which causes height deviation. Therefore, the upper and lower surfaces of the mold and the rotor core do not fit each other, which makes injection molding difficult. Even if an injection resin material is filled into an injection material filling hole and a gap around the circumferential surface of a magnet of laminar members, burr occurs in the upper surface of the filled injection resin material. Thus, a separate process for removing the burr is required.
  • the mold has to be calibrated every time according to the heights of laminated rotor cores in order to overcome height deviation of the laminated laminar members, which requires much time and cost for calibration and huge economic damages.
  • the present inventor suggests an apparatus for molding a magnet of a rotor core of a new type having multiple cavities, allowing a molten resin sufficient to be molded in a molten resin filling space while a laminated rotor core is firmly fixed fitting the diameter and height of the laminated rotor core.
  • the present invention provides one molding apparatus having multiple cavities, thereby improving productivity of rotor cores and also fixing the outer circumference of a laminated rotor core according to the diameter of the rotor core, and allowing an injection molten resin material to be filled into an injection molten resin filling hole of the laminated rotor core and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole, to fit the height of the rotor core, thereby firmly fixing the magnet and also avoiding occurrence of burr, and improving the quality and productivity of the laminated rotor core.
  • An apparatus 100 for molding a magnet of a rotor core includes an upper mold 10 and a lower mold 30, the apparatus seating a laminated rotor core 20 on a laminated rotor core seating part 31 in the lower mold 30, and then injecting an injection molten resin from the upper mold 10 through an injection molten resin supply nozzle 10-1, to fill a molten resin material 80 into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole 23, the apparatus comprising: a plurality of laminated rotor core seating parts 31 having multiple cavities, installed in the upper part of an upper plate 32 of the lower mold 30; and an ascending and descending support 50 in the lower end of a rotor core seating block 41 installed below the plurality of laminated rotor core seating parts 31, to fit the height of the laminated rotor core, wherein the molten resin material 80 is filled into the molten resin
  • the rotor core seating part 31 may comprise a core inner circumference fixing core jig 40 coupled to the upper part of a coupling bolt 33A fastened to a support member 33 installed in the upper plate 32 of the lower mold 30; and an auxiliary fitting protrusion 40A coupled to a coupling bolt 41A fastened to a rotor core seating block 41 inserted and fitted into the upper outer circumference of the support member 33, wherein a plurality of adjustable rotor core outer circumference fixing core jigs 310 are configured to be arranged on the upper surface of the upper plate 32 in the outer circumference of the auxiliary fitting protrusion 40A.
  • each of the plurality of adjustable rotor core outer circumference fixing core jigs 310 may comprise a plurality of front pressure members 311 having inner curved surfaces 311A; a pressure tight contact member 312 installed in the back end of each of the front pressure members 311; a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and a fixing block 313, to fix the outer circumference of the laminated rotor core 20 according to the diameter of the laminated rotor core 20.
  • each of the inner curved surfaces 311A of the plurality of front pressure members 311 may be in tight-contact with the outer circumferential surface of the laminated rotor core 20, to stably tight-contact the overall outer circumferential surface of the laminated rotor core 20 having a circular shape.
  • a coupling hole 311B formed in the center of the front pressure member 311 may be configured to correspond to a coupling hole 312A formed in the center of the pressure tight contact member 312 to be coupled to each other by a coupling bolt B1, a fitting wing piece 311C protruding backwardly of the front pressure member 311 may be fitted into a fitting guiding groove 312B formed in the front of the pressure tight contact member 312 for precise assembling, the slide liner 314 for adjustment to fit the diameter of a laminated rotor core seated on a seating step 312C formed in the back of the pressure tight contact member 312 may be coupled to the pressure tight contact member 312 by a coupling bolt B2, and the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core may be configured to be in surface-contact with the inner surface of a fixing block 313 coupled to the upper plate 32 by a coupling bolt B3.
  • a spring SP may be installed in the inner surface of the fixing block 313, and the front of the spring SP may be brought into surface-contact with the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core.
  • the ascending and descending support 50 may comprise an ascending and descending support member 51 installed in a plurality of grooves 32C formed in the upper plate 32 of the lower mold 30; and a plurality of elastic members 53 formed of a dish-shaped circular plate spring in a guiding fixing bolt 52 fastened and coupled to the ascending and descending support member 51.
  • the present invention arranges a plurality of laminated rotor core seating parts in one molding apparatus, thereby improving productivity of laminated rotor cores through molding operation on the laminated rotor cores and reducing the manufacturing costs.
  • the present invention smoothly corresponds the diameters of rotor core seating parts to the diameters of laminated rotor cores laminated separately according to the diameters of laminar members during a process for manufacturing laminar members, and thus is capable of providing a plurality of cavities having spaces for different diameters in one apparatus for molding a magnet of a rotor core, thereby enabling mass production of laminated rotor cores having different diameters with one apparatus for molding a magnet of a rotor core.
  • the present invention separates the worn front pressure member from the pressure tight contact member to be changed or changes the slide liner for adjustment to fit the diameter of a laminated rotor core, thereby reducing the changing costs through the change of parts of the adjustable rotor core outer circumference fixing core jig and also providing convenience in changing operation.
  • the present invention allows the inner circumference of a laminated rotor core seated on the laminated rotor core seating part to be supported by the core inner circumference fixing core jig and auxiliary fitting protrusion to be stably seated, and allows the outer circumference of the laminated rotor core to tightly contact the inner curved surfaces of the plurality of front pressure members of the adjustable rotor core outer circumference fixing core jig to be stably fixed and supported, thereby maintaining the outer circumferential surface of the laminated rotor core in a fixed state without faltering and performing a molten resin injection process without any errors.
  • the present invention allows the ascending and descending support member for the core tight contact block to ascend and descend according to the height of a laminated rotor core by elasticity of the circular plate spring installed in the lower mold, such that the upper surface of the core tight contact block may be in strong tight-contact with the lower surface of the laminated rotor core, and thus the upper surface of the laminated rotor core is in strong tight-contact with the lower surface of the upper mold by the pressure of the circular plate spring, and at the same time, the upper surface of the core tight contact block is in strong tight-contact with the lower surface of the laminated rotor core, to inhibit clearance therebetween, and accordingly, the molten resin may be filled into an injection molten resin filling hole for adhesion and into a gap between the outer circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole, allowing the magnet to be coupled and maintained in a firm state without separation or movement and at the same time avoiding burr in the upper and lower surfaces of the injection resin material filling hole
  • the present invention modifies a common injection mold to be height adjustable by elasticity of the circular plate spring, regardless of the height of a laminated rotor core, and also provides convenience in an increase or decrease in the number of circular plate springs according to the height of the laminated rotor core and in change thereof, thereby easily performing injection molding for adhering the laminated rotor core without calibrating the injection mold and significantly reducing the costs for manufacturing an apparatus for molding a magnet of a rotor core according to the present invention.
  • Fig. 1 is an overall perspective view of an apparatus for molding a magnet of a rotor core according to the present invention
  • Fig. 2 is a plan view of a lower mold of an apparatus for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core is not seated;
  • Fig. 3 is a plan view of a lower mold of an apparatus for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core is seated;
  • Fig. 4 is a perspective view of excerpts of a laminated rotor core seated on a lower mold of an apparatus for molding a magnet of a rotor core according to the present invention and of a rotor core seating part;
  • Fig. 5 is an exploded perspective view of a rotor core seating part of an apparatus for molding a magnet of a rotor core according to the present invention
  • Fig. 6 is an overall longitudinal cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention
  • Fig. 7 is an overall longitudinal cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core having a greater diameter is seated on a rotor core seating part;
  • Fig. 8 is an overall longitudinal cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core having a smaller diameter is seated on a rotor core seating part;
  • Fig. 9 is a plan view of operation of pressing the outer circumferential surfaces of laminated rotor cores having different diameters applied to the present invention by an adjustable rotor core outer circumference fixing core jig, wherein the solid line indicates a laminated rotor core having a greater diameter and the dash-dot line indicates a laminated rotor core having a smaller diameter;
  • Fig. 10 is a partial cross-sectional view for explaining an ascending and descending support of an apparatus for molding a magnet of a rotor core according to the present invention
  • Fig. 11 is a cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention in an operation state
  • Fig. 12 is a perspective view of a laminated rotor core in which a molten resin material is filled according to the present invention.
  • the present invention is to provide an apparatus for molding a magnet of a rotor core applied to a driving motor for electric vehicles.
  • the present invention will be described in detail with reference to the accompanying drawings.
  • Fig. 1 is an overall perspective view of an apparatus 100 for molding a magnet of a rotor core according to the present invention.
  • Fig. 2 is a plan view of a lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core 20 is not seated.
  • Fig. 3 is a plan view of the lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core 20 is seated.
  • Fig. 1 is an overall perspective view of an apparatus 100 for molding a magnet of a rotor core according to the present invention.
  • Fig. 2 is a plan view of a lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core 20 is not seated.
  • Fig. 3 is a plan view of the lower mold 30 of the apparatus 100 for molding a magnet of
  • FIG. 4 is a perspective view of excerpts of a laminated rotor core 20 seated on the lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention and of a rotor core seating part 31.
  • Fig. 5 is an exploded perspective view of the rotor core seating part 31 of the apparatus 100 for molding a magnet of a rotor core according to the present invention.
  • Fig. 6 is an overall longitudinal cross-sectional view of the apparatus 100 for molding a magnet of a rotor core according to the present invention.
  • the apparatus 100 for molding a magnet of a rotor core includes an upper mold 10 and a lower mold 30, and may have the features of seating a laminated rotor core 20 on a laminated rotor core seating part 31 in the lower mold 30, then distributing an injection molten resin supplied through an injection molten resin supply nozzle 10-1 of the upper mold 10 by a hot runner in a lower plate 11 of the upper mold 10, and injecting the injection molten resin through a plurality of injection resin material supply holes (not shown) formed through the circumference of a central fixing block 11A of the lower plate 11, to fill a molten resin material 80 into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23.
  • the laminated rotor core 20 applied to the present invention is a rotor core used in a motor for electric vehicles, manufactured by laminating a plurality of laminar members made of a steel strip.
  • a magnet M is inserted into the magnet insertion hole 23 formed in the outer circumference of the core having a central shaft hole 21.
  • a molten resin filling space for fixing the magnet between both sides of the magnet M and the inner circumference of the magnet insertion hole 23 and of the lower part of the magnet M and the lower inner circumference of the magnet insertion hole 23, and a plurality of molten resin filling holes 22 for curing the laminar members of the laminated rotor core 20 by the molten resin are formed.
  • the upper and lower molds 10, 30 are brought into contact with each other, and a molten resin material 80 is filled and molded into the molten resin filling space for fixing a magnet and the molten resin filling holes 22, as shown in Fig. 12.
  • a guiding hole 24 is formed at both ends of the laminated rotor core 20, into which an auxiliary fitting protrusion 40A at both ends of a core inner circumference fixing core jig 40 protruding upwardly coupled with a rotor core seating block 41 for fixing the inner circumference of the laminated rotor core 20 by seating the laminated rotor core 20 on the laminated rotor core seating part 31, is inserted.
  • Such laminated rotor cores 20 may have a problem that the rotor core seating parts 31 of the lower mold 30 should have different diameters because a plurality of laminar members made of a steel strip may have different diameters during a process of manufacturing the laminar members.
  • an adjustable rotor core outer circumference fixing core jig 310 is installed in the rotor core seating part 31 to fit the outer circumferential diameter of a rotor core to be applied to the lower mold 30 of the present invention having a plurality of cavities.
  • each of the plurality of adjustable rotor core outer circumference fixing core jigs 310 of the rotor core seating part 31 having a plurality of cavities comprises a plurality of front pressure members 311 having inner curved surfaces 311A; a pressure tight contact member 312 installed in the back end of each of the front pressure members 311; and a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and a fixing block 313, to fix the outer circumference of the laminated rotor core 20 according to the diameter of the laminated rotor core 20.
  • the adjustable rotor core outer circumference fixing core jig 310 is configured to be arranged between fixing support blocks 310A fixed to an upper plate 32, to prevent the adjustable rotor core outer circumference fixing core jig 310 from deviating outwardly.
  • Reference numeral 310B in the drawings refers to a support block for supporting the corner of the adjustable rotor core outer circumference fixing core jig 310.
  • the present invention fits the central shaft hole 21 and the guiding hole 24 of the laminated rotor core 20 into the core inner circumference fixing core jig 40 and the auxiliary fitting protrusion 40A at the same time, to seat the laminated rotor core 20 on the laminated rotor core seating part 31 while fixing the inner circumference of the laminated rotor core 20.
  • the inner circumference of the laminated rotor core 20 seated on the laminated rotor core seating part 31 is supported by the core inner circumference fixing core jig 40 and the auxiliary fitting protrusion 40A to be stably seated.
  • the outer circumference of the laminated rotor core 20 is in tight contact with the inner curved surfaces 311A of the plurality of front pressure members 311 of the adjustable rotor core outer circumference fixing core jig 310 to be stably fixed and supported.
  • the rotor core seating part 31 having a plurality of cavities will be described in detail.
  • the rotor core seating part 31 comprises: a core inner circumference fixing core jig 40 coupled to the upper part of a coupling bolt 33A fastened to a support member 33 installed in the upper plate 32 of the lower mold 30; and an auxiliary fitting protrusion 40A coupled to a coupling bolt 41A fastened to a rotor core seating block 41 inserted and fitted into the upper outer circumference of the support member 33, wherein a plurality of adjustable rotor core outer circumference fixing core jigs 310 are configured to be arranged in a circle on the upper surface of the upper plate 32 in the outer circumference of the auxiliary fitting protrusion 40A.
  • a plurality of front pressure members 311 of the adjustable rotor core outer circumference fixing core jig 310 are seated on the upper surfaces of a plurality of protrusions 32A of the upper plate 32 corresponding thereto.
  • the lower parts of pressure tight contact members 312 coupled to the front pressure members 311 are inserted and coupled to a plurality of guiding recessed 32B of the upper plate 32, such that the pressure tight contact member 312 is movable along the guiding recess 32B according to the thickness of a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and the fixing block 313.
  • the diameter of the rotor core seating part 31 can be smoothly adjustable to fit the diameters of laminated rotor cores 20 laminated separately according to the diameters of laminar members during a process for manufacturing laminar members, thereby allowing one apparatus 100 for molding a magnet of a rotor core to provide a plurality of cavities having spaces for different diameters, which enables mass production of laminated rotor cores 20 having different diameters by one apparatus 100 for molding a magnet of a rotor core.
  • the present invention illustrates a rotor core seating part 31 with four cavities.
  • a rotor core seating part 31 with two cavities or six cavities may be arranged in one apparatus 100 for molding a magnet of a rotor core.
  • laminated rotor cores 20 having different diameters may be arranged in four cavities of the rotor core seating part 31 to perform molding, or laminated rotor cores 20 having the same diameter may be arranged in one or two cavities of the rotor core seating part 31 to perform molding.
  • the diameters of laminated rotor cores 20 may be measured during a process of laminating rotor cores, and the diameters of the rotor core seating parts 31 may be adjusted manually according to the measured diameters of the laminated rotor cores 20, as above.
  • the worn front pressure member 311 is separated from the pressure tight contact member 312 to be changed or the slide liner 314 for adjustment to fit the diameter of a laminated rotor core is changed, thereby reducing the costs for changing the adjustable rotor core outer circumference fixing core jig 310 and at the same time providing convenience in changing operation.
  • each of the inner curved surfaces 311A of the plurality of front pressure members 311 has an area corresponding to a quarter of the circular circumference, such that each of the inner curved surfaces 311A is in tight contact with the outer circumferential surface of a laminated rotor core 20, allowing stable tight-contact of the overall outer circumferential surface of the laminated rotor core 20 having a circular shape.
  • a coupling hole 311B formed in the center of the front pressure member 311 is configured to correspond to a coupling hole 312A formed in the center of the pressure tight contact member 312 to be coupled to each other by a coupling bolt B1, and a fitting wing piece 311C protruding backwardly of the front pressure member 311 is fitted into a fitting guiding groove 312B formed in the front of the pressure tight contact member 312 for precise assembling.
  • the slide liner 314 for adjustment to fit the diameter of a laminated rotor core seated on a seating step 312C formed in the back of the pressure tight contact member 312 is coupled to the pressure tight contact member 312 by a coupling bolt B2, and the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core is configured to be in surface-contact with the inner surface of a fixing block 313 coupled to the upper plate 32 by a coupling bolt B3.
  • the slide liner 314 for adjustment to fit the diameter of a laminated rotor core, having a corresponding thickness can be smoothly changed according to the diameter of a laminated rotor core 20, while the overall outer circumferential surface of the laminated rotor core 20 is in tight contact with the inner curved surfaces 311A of the front pressure member 311.
  • the pressure tight contact member 312 is moved outwardly along the guiding recess 32B of the upper plate 32, thereby making the diameter of the rotor core seating part 31 greater.
  • the pressure tight contact member 312 is moved inwardly along the guiding recess 32B of the upper plate 32, as shown in Fig. 6, thereby making the diameter of the rotor core seating part 31 smaller.
  • Fig. 7 is an overall longitudinal cross-sectional view of an apparatus 100 for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core 20 having a greater diameter is seated on a rotor core seating part 31.
  • Fig. 8 is an overall longitudinal cross-sectional view of the apparatus 100 for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core 20 having a smaller diameter is seated on the rotor core seating part 31.
  • Fig. 8 is an overall longitudinal cross-sectional view of the apparatus 100 for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core 20 having a smaller diameter is seated on the rotor core seating part 31.
  • FIG. 9 is a plan view of operation of pressing the outer circumferential surfaces of laminated rotor cores 20 having different diameters by an adjustable rotor core outer circumference fixing core jig 310, wherein the solid line indicates a laminated rotor core 20 having a greater diameter and the dash-dot line indicates a laminated rotor core 20 having a smaller diameter.
  • a spring SP is installed in the inner surface of the fixing block 313, wherein the front of the spring SP is brought into surface-contact with the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core, so as to strongly increase a pressure tight contact of the front pressure member 311 against the laminated rotor core 20 by elasticity of the spring SP, thereby firmly supporting the outer circumferential surface of the laminated rotor core 20.
  • an inclined surface 311A' is formed around the upper part of the inner curved surface 311A of the front pressure member 311 for seating through smooth insertion, such that the laminated rotor core 20 is guided along the inclined surface 311A' of the inner curved surface 311A of the front pressure member 311 and seated while pressing the spring SP outwardly.
  • the laminated rotor cores 20 seated on the respective rotor core seating parts 31 may have different heights.
  • Fig. 10 is a partial cross-sectional view for explaining an ascending and descending support 50 in an apparatus 100 for molding a magnet of a rotor core according to the present invention.
  • the present invention may provide the ascending and descending support 50 in the lower end of a rotor core seating block 41 installed below the plurality of laminated rotor core seating parts 31, to fit the height of a laminated rotor core 20.
  • the ascending and descending support 50 may comprise an ascending and descending support member 51 installed in a plurality of grooves 32C formed in the upper plate 32 of the lower mold 30; and a plurality of elastic members 53 formed of a dish-shaped circular plate spring in a guiding fixing bolt 52 fastened and coupled to the ascending and descending support member 51.
  • the upper plate 32 has four grooves 32C, and the ascending and descending support member 51 fitted into the groove 32C is elastically supported by the elastic member 53 to ascend and descend.
  • the ascending and descending support member 51 elastically supports the rotor core seating block 41 by elasticity of the elastic member 53, such that the upper surface of the laminated rotor core 20 is brought into tight contact with the lower surface of the central fixing block 11A of the lower plate 11 of the upper mold 10 without clearance, and the lower surface of the laminated rotor core 20 is maintained to be in tight contact with the upper surface of the rotor core seating block 41 without clearance.
  • the molten resin material 80 may be stably filled into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole, without leakage.
  • the molten resin material 80 is injected while the upper and lower surfaces of the laminated rotor core 20 are maintained to be in tight contact without clearance by elasticity of the elastic member 53.
  • no burr occurs in the upper and lower surfaces of the molten resin material 80 filled in the laminated rotor core 20, thereby capable of omitting a process for removing burr and significantly improving the productivity as well as improving the quality of laminated rotor cores 20.
  • the number of elastic members 53 formed of a dish-shaped circular plate spring is determined according to the height of the laminated rotor core 20 by elasticity (elastic force and repulsive force), and the elastic member 53 is fitted into the guiding fixing bolt 52 and also the ascending and descending support member 51 is fastened to the guiding fixing bolt 52, thereby screw-coupling and fastening the guiding fixing bolt 52.
  • the guiding fixing bolt 52 may be smoothly unscrewed to change the elastic member 53 or the number of elastic members 53 may be easily increased or decreased according to the height of the laminated rotor core 20.
  • the elastic pressure of the elastic member 53 may be adjusted according to the height of the laminated rotor core 20 freely without calibrating the apparatus 100 for molding a magnet of a rotor core, thereby achieving economic benefits through time saving as well as reduction of costs to be incurred to calibrate the apparatus 100 for molding a magnet of a rotor core.
  • the number of elastic members 53 may be increased or decreased by calculating the load of the elastic member 53 in correspondence to an injection pressure according to the height of the laminated rotor core 20.
  • the elastic member 53 pressed springs as the upper mold 10 and the lower mold 30 are separated from each other, and thus the rotor core seating block 41 is lifted up to push the laminated rotor core 20 upwardly, capable of taking out the laminated rotor core 20 in which laminar members are adhered by the molten resin.
  • Fig. 11 is a cross-sectional view of an apparatus 100 for molding a magnet of a rotor core according to the present invention in an operation state.
  • Fig. 12 is a perspective view of a laminated rotor core 20 in which a molten resin material 80 is filled according to the present invention.
  • the present invention having the above configuration may distribute a molten resin injected from an injection molten resin supply nozzle 10-1 of the upper mold 10, by a hot runner in the lower plate 11 of the upper mold 10, while a laminated rotor core 20 is seated on the rotor core seating part 31 and then the upper mold 10 and the lower mold 30 are brought into contact with each other, inject the injection molten resin through a plurality of injection resin material supply holes (not shown) formed through the circumference of a central fixing block 11A of the lower plate 11 of the upper mold 10 to be filled into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23, and allow the molten resin material 80 filled into the molten resin filling hole 22 of the laminated rotor core 20 to adhere laminar members of the laminated rotor core 20.
  • the rotor core seating block 41 may support a magnet M inserted into the magnet insertion hole 23 of the laminated rotor core 20 not to be separated therefrom.
  • the molten resin material 80 for fixing the magnet M is filled while the upper surfaces of magnets M inserted into a plurality of magnet insertion holes 23 into which the magnets M are inserted are elastically in surface-contact with the lower surfaces of pressure members 11B installed in the central fixing block 11A of the lower plate 11 of the upper mold 10.
  • the magnets M are neither inclined nor biased in one direction inside the magnet insertion holes 23, and the molten resin material 80 is evenly filled into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23, as shown in Fig. 12, thereby increasing the fixing of the magnet M.
  • the pressure member 11B is elastically pressed by a spring of the upper mold 10 to allow the magnet M to be maintained in a fixed state when the lower surface of the central fixing block 11A of the lower block 11 of the upper mold 10 is in tight contact with the upper surface of the laminated rotor core 20.

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Abstract

An apparatus 100 for molding a magnet of a rotor core according to the present invention includes an upper mold 10 and a lower mold 30, the apparatus seating a laminated rotor core 20 on a laminated rotor core seating part 31 in the lower mold 30, and then injecting an injection molten resin from the upper mold 10 through an injection molten resin supply nozzle 10-1, to fill a molten resin material 80 into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole 23, the apparatus comprising: a plurality of laminated rotor core seating parts 31 having multiple cavities, installed in the upper part of an upper plate 32 of the lower mold 30; and an ascending and descending support 50 in the lower end of a rotor core seating block 41 installed below the plurality of laminated rotor core seating parts 31, to fit the height of the laminated rotor core, wherein the molten resin material 80 is filled into the molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of the magnet and the inner circumferential surface of the magnet insertion hole 23, while the outer circumference and upper and lower surfaces of the laminated rotor core 20 seated on the laminated rotor core seating part 31 are fixed corresponding to the diameter and height of the laminated rotor core 20.

Description

APPARATUS FOR RESIN MOLDING OF ROTOR CORE MAGNET
The present invention relates to an injection molding apparatus having multiple cavities for fixing a magnet to a rotor core of a motor used in a driving motor for electric vehicles. More specifically, the present invention relates to an apparatus for molding a magnet of a rotor core of a driving motor for electric vehicles having multiple cavities, capable of improving reliability of the apparatus for molding a magnet having multiple cavities to increase production efficiency, and reducing adhesion defects in rotor cores to improve the quality of rotor cores, by molding a magnet inserted into a rotor core manufactured by laminating laminar members with a molten resin to be fixed and simultaneously filling the molten resin into a molten resin filling space of the laminated rotor core.
According to conventional methods of laminating a motor core, a laminated rotor core is manufactured by sequentially punching slots, teeth, etc., on a strip supplied to a progressive die to continuously form core sheets of laminar member, laminating laminar members having a finally punched shape in a predetermined number, and adhering the same. As in Korean Patent Laid-Open No. 10-2005-0026882, etc., an embossing laminating method for forming embossings on each laminar member and compressing the embossings for coupling when laminating the laminar members is known as a method for adhering laminar members.
In each of the laminated laminar members, a plurality of injection resin material filling holes are arranged in the inner circumference and a plurality of magnet insertion holes for inserting magnets are arranged close to the outer circumferential surface.
Magnets are inserted into the magnet insertion holes and then fixed. Korean Patent No. 10-2214753 discloses a technique for filling a resin adhesive, an injection molten resin, into a gap between the magnet insertion hole and the circumference of the magnet, and curing and fixing the same.
The above prior art provides an epoxy mold compound (EMC) mold for fixing magnets of a motor for electric vehicles which automatically injects an injection resin material, EMC, into a mold to prevent separation of the magnets inserted into magnet insertion holes in a rotor core of a motor for electric vehicles from the magnet insertion holes, thereby reducing defects caused by manual operation, and injects the EMC into the magnet insertion holes of the motor core into which the magnets are inserted, thereby preventing separation of the magnets over time and also improving productivity because the EMC is injected into the mold.
Injection material filling holes and magnet insertion holes are formed using the EMC mold for fixing magnets. The injection resin material is filled into the injection material filling holes and into the gaps between the magnet insertion holes and the circumferences of the magnets inserted into the magnet insertion holes in the laminar member, while laminar members having the magnets inserted into the magnet insertion holes are laminated. Thereby, the magnets can be firmly fixed by the injection resin material.
The prior art relates to a molding apparatus having one cavity, which leads to significantly low productivity of rotor cores and an increase in the costs for manufacturing rotor cores. When applying the prior art to a molding apparatus that may have a plurality of cavities, the prior art does not mention a feature of injecting a molten resin for a plurality of rotor cores having different diameters, and thus it cannot be applied to a molding apparatus having multiple cavities.
In addition, the strip, a base material of laminar members, does not have a constant thickness, which causes thickness deviation. Accordingly, laminar members do not have the same thickness, and thus laminated rotor cores of a motor which are placed between the upper mold and the lower mold do not have the same height, which causes height deviation. Therefore, the upper and lower surfaces of the mold and the rotor core do not fit each other, which makes injection molding difficult. Even if an injection resin material is filled into an injection material filling hole and a gap around the circumferential surface of a magnet of laminar members, burr occurs in the upper surface of the filled injection resin material. Thus, a separate process for removing the burr is required. In addition, the mold has to be calibrated every time according to the heights of laminated rotor cores in order to overcome height deviation of the laminated laminar members, which requires much time and cost for calibration and huge economic damages.
Conventionally, it has been attempted to use general injection molds for fixing magnets of a laminated rotor core of a motor by an injection resin material. However, due to the above problems, injection molds can hardly be developed and have not been developed yet.
Accordingly, the present inventor suggests an apparatus for molding a magnet of a rotor core of a new type having multiple cavities, allowing a molten resin sufficient to be molded in a molten resin filling space while a laminated rotor core is firmly fixed fitting the diameter and height of the laminated rotor core.
The present invention provides one molding apparatus having multiple cavities, thereby improving productivity of rotor cores and also fixing the outer circumference of a laminated rotor core according to the diameter of the rotor core, and allowing an injection molten resin material to be filled into an injection molten resin filling hole of the laminated rotor core and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole, to fit the height of the rotor core, thereby firmly fixing the magnet and also avoiding occurrence of burr, and improving the quality and productivity of the laminated rotor core.
An apparatus 100 for molding a magnet of a rotor core according to the present invention includes an upper mold 10 and a lower mold 30, the apparatus seating a laminated rotor core 20 on a laminated rotor core seating part 31 in the lower mold 30, and then injecting an injection molten resin from the upper mold 10 through an injection molten resin supply nozzle 10-1, to fill a molten resin material 80 into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole 23, the apparatus comprising: a plurality of laminated rotor core seating parts 31 having multiple cavities, installed in the upper part of an upper plate 32 of the lower mold 30; and an ascending and descending support 50 in the lower end of a rotor core seating block 41 installed below the plurality of laminated rotor core seating parts 31, to fit the height of the laminated rotor core, wherein the molten resin material 80 is filled into the molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of the magnet and the inner circumferential surface of the magnet insertion hole 23, while the outer circumference and upper and lower surfaces of the laminated rotor core 20 seated on the laminated rotor core seating part 31 are fixed corresponding to the diameter and height of the laminated rotor core 20.
In the present invention, the rotor core seating part 31 may comprise a core inner circumference fixing core jig 40 coupled to the upper part of a coupling bolt 33A fastened to a support member 33 installed in the upper plate 32 of the lower mold 30; and an auxiliary fitting protrusion 40A coupled to a coupling bolt 41A fastened to a rotor core seating block 41 inserted and fitted into the upper outer circumference of the support member 33, wherein a plurality of adjustable rotor core outer circumference fixing core jigs 310 are configured to be arranged on the upper surface of the upper plate 32 in the outer circumference of the auxiliary fitting protrusion 40A.
In the present invention, each of the plurality of adjustable rotor core outer circumference fixing core jigs 310 may comprise a plurality of front pressure members 311 having inner curved surfaces 311A; a pressure tight contact member 312 installed in the back end of each of the front pressure members 311; a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and a fixing block 313, to fix the outer circumference of the laminated rotor core 20 according to the diameter of the laminated rotor core 20.
In the present invention, each of the inner curved surfaces 311A of the plurality of front pressure members 311 may be in tight-contact with the outer circumferential surface of the laminated rotor core 20, to stably tight-contact the overall outer circumferential surface of the laminated rotor core 20 having a circular shape.
In the present invention, a coupling hole 311B formed in the center of the front pressure member 311 may be configured to correspond to a coupling hole 312A formed in the center of the pressure tight contact member 312 to be coupled to each other by a coupling bolt B1, a fitting wing piece 311C protruding backwardly of the front pressure member 311 may be fitted into a fitting guiding groove 312B formed in the front of the pressure tight contact member 312 for precise assembling, the slide liner 314 for adjustment to fit the diameter of a laminated rotor core seated on a seating step 312C formed in the back of the pressure tight contact member 312 may be coupled to the pressure tight contact member 312 by a coupling bolt B2, and the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core may be configured to be in surface-contact with the inner surface of a fixing block 313 coupled to the upper plate 32 by a coupling bolt B3.
In the present invention, a spring SP may be installed in the inner surface of the fixing block 313, and the front of the spring SP may be brought into surface-contact with the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core.
In the present invention, the ascending and descending support 50 may comprise an ascending and descending support member 51 installed in a plurality of grooves 32C formed in the upper plate 32 of the lower mold 30; and a plurality of elastic members 53 formed of a dish-shaped circular plate spring in a guiding fixing bolt 52 fastened and coupled to the ascending and descending support member 51.
The present invention arranges a plurality of laminated rotor core seating parts in one molding apparatus, thereby improving productivity of laminated rotor cores through molding operation on the laminated rotor cores and reducing the manufacturing costs.
Also, the present invention smoothly corresponds the diameters of rotor core seating parts to the diameters of laminated rotor cores laminated separately according to the diameters of laminar members during a process for manufacturing laminar members, and thus is capable of providing a plurality of cavities having spaces for different diameters in one apparatus for molding a magnet of a rotor core, thereby enabling mass production of laminated rotor cores having different diameters with one apparatus for molding a magnet of a rotor core.
Also, when the front pressure member is worn away and a tight contact with the outer circumferential surface of a laminated rotor core is degraded, the present invention separates the worn front pressure member from the pressure tight contact member to be changed or changes the slide liner for adjustment to fit the diameter of a laminated rotor core, thereby reducing the changing costs through the change of parts of the adjustable rotor core outer circumference fixing core jig and also providing convenience in changing operation.
Also, the present invention allows the inner circumference of a laminated rotor core seated on the laminated rotor core seating part to be supported by the core inner circumference fixing core jig and auxiliary fitting protrusion to be stably seated, and allows the outer circumference of the laminated rotor core to tightly contact the inner curved surfaces of the plurality of front pressure members of the adjustable rotor core outer circumference fixing core jig to be stably fixed and supported, thereby maintaining the outer circumferential surface of the laminated rotor core in a fixed state without faltering and performing a molten resin injection process without any errors.
Also, the present invention allows the ascending and descending support member for the core tight contact block to ascend and descend according to the height of a laminated rotor core by elasticity of the circular plate spring installed in the lower mold, such that the upper surface of the core tight contact block may be in strong tight-contact with the lower surface of the laminated rotor core, and thus the upper surface of the laminated rotor core is in strong tight-contact with the lower surface of the upper mold by the pressure of the circular plate spring, and at the same time, the upper surface of the core tight contact block is in strong tight-contact with the lower surface of the laminated rotor core, to inhibit clearance therebetween, and accordingly, the molten resin may be filled into an injection molten resin filling hole for adhesion and into a gap between the outer circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole, allowing the magnet to be coupled and maintained in a firm state without separation or movement and at the same time avoiding burr in the upper and lower surfaces of the injection resin material filling hole of the upper laminar member of the laminated rotor core and the upper and lower surfaces of the injection resin material filled into the gap between the outer circumferential surface of the magnet and the inner circumferential surface of the magnet insertion hole, thereby capable of omitting a process for removing burr and significantly improving the productivity of laminated rotor cores as well as improving the quality of laminated rotor cores.
Also, the present invention modifies a common injection mold to be height adjustable by elasticity of the circular plate spring, regardless of the height of a laminated rotor core, and also provides convenience in an increase or decrease in the number of circular plate springs according to the height of the laminated rotor core and in change thereof, thereby easily performing injection molding for adhering the laminated rotor core without calibrating the injection mold and significantly reducing the costs for manufacturing an apparatus for molding a magnet of a rotor core according to the present invention.
Fig. 1 is an overall perspective view of an apparatus for molding a magnet of a rotor core according to the present invention;
Fig. 2 is a plan view of a lower mold of an apparatus for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core is not seated;
Fig. 3 is a plan view of a lower mold of an apparatus for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core is seated;
Fig. 4 is a perspective view of excerpts of a laminated rotor core seated on a lower mold of an apparatus for molding a magnet of a rotor core according to the present invention and of a rotor core seating part;
Fig. 5 is an exploded perspective view of a rotor core seating part of an apparatus for molding a magnet of a rotor core according to the present invention;
Fig. 6 is an overall longitudinal cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention;
Fig. 7 is an overall longitudinal cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core having a greater diameter is seated on a rotor core seating part;
Fig. 8 is an overall longitudinal cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core having a smaller diameter is seated on a rotor core seating part;
Fig. 9 is a plan view of operation of pressing the outer circumferential surfaces of laminated rotor cores having different diameters applied to the present invention by an adjustable rotor core outer circumference fixing core jig, wherein the solid line indicates a laminated rotor core having a greater diameter and the dash-dot line indicates a laminated rotor core having a smaller diameter;
Fig. 10 is a partial cross-sectional view for explaining an ascending and descending support of an apparatus for molding a magnet of a rotor core according to the present invention;
Fig. 11 is a cross-sectional view of an apparatus for molding a magnet of a rotor core according to the present invention in an operation state; and
Fig. 12 is a perspective view of a laminated rotor core in which a molten resin material is filled according to the present invention.
The present invention is to provide an apparatus for molding a magnet of a rotor core applied to a driving motor for electric vehicles. The present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is an overall perspective view of an apparatus 100 for molding a magnet of a rotor core according to the present invention. Fig. 2 is a plan view of a lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core 20 is not seated. Fig. 3 is a plan view of the lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention, on which a laminated rotor core 20 is seated. Fig. 4 is a perspective view of excerpts of a laminated rotor core 20 seated on the lower mold 30 of the apparatus 100 for molding a magnet of a rotor core according to the present invention and of a rotor core seating part 31. Fig. 5 is an exploded perspective view of the rotor core seating part 31 of the apparatus 100 for molding a magnet of a rotor core according to the present invention. Fig. 6 is an overall longitudinal cross-sectional view of the apparatus 100 for molding a magnet of a rotor core according to the present invention.
The apparatus 100 for molding a magnet of a rotor core according to the present invention includes an upper mold 10 and a lower mold 30, and may have the features of seating a laminated rotor core 20 on a laminated rotor core seating part 31 in the lower mold 30, then distributing an injection molten resin supplied through an injection molten resin supply nozzle 10-1 of the upper mold 10 by a hot runner in a lower plate 11 of the upper mold 10, and injecting the injection molten resin through a plurality of injection resin material supply holes (not shown) formed through the circumference of a central fixing block 11A of the lower plate 11, to fill a molten resin material 80 into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23.
The laminated rotor core 20 applied to the present invention is a rotor core used in a motor for electric vehicles, manufactured by laminating a plurality of laminar members made of a steel strip. As shown in Fig. 4, in the laminated rotor core 20, a magnet M is inserted into the magnet insertion hole 23 formed in the outer circumference of the core having a central shaft hole 21. A molten resin filling space for fixing the magnet between both sides of the magnet M and the inner circumference of the magnet insertion hole 23 and of the lower part of the magnet M and the lower inner circumference of the magnet insertion hole 23, and a plurality of molten resin filling holes 22 for curing the laminar members of the laminated rotor core 20 by the molten resin are formed. The upper and lower molds 10, 30 are brought into contact with each other, and a molten resin material 80 is filled and molded into the molten resin filling space for fixing a magnet and the molten resin filling holes 22, as shown in Fig. 12.
A guiding hole 24 is formed at both ends of the laminated rotor core 20, into which an auxiliary fitting protrusion 40A at both ends of a core inner circumference fixing core jig 40 protruding upwardly coupled with a rotor core seating block 41 for fixing the inner circumference of the laminated rotor core 20 by seating the laminated rotor core 20 on the laminated rotor core seating part 31, is inserted.
Such laminated rotor cores 20 may have a problem that the rotor core seating parts 31 of the lower mold 30 should have different diameters because a plurality of laminar members made of a steel strip may have different diameters during a process of manufacturing the laminar members.
Thus, preferably, an adjustable rotor core outer circumference fixing core jig 310 is installed in the rotor core seating part 31 to fit the outer circumferential diameter of a rotor core to be applied to the lower mold 30 of the present invention having a plurality of cavities.
Also, when laminated rotor cores 20 having different diameters are seated for mass production of laminated rotor cores 20, it is necessary to install an adjustable rotor core outer circumference fixing core jig 310 in the rotor core seating part 31 having a plurality of cavities.
In order to solve the above problem, according to the present invention, each of the plurality of adjustable rotor core outer circumference fixing core jigs 310 of the rotor core seating part 31 having a plurality of cavities comprises a plurality of front pressure members 311 having inner curved surfaces 311A; a pressure tight contact member 312 installed in the back end of each of the front pressure members 311; and a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and a fixing block 313, to fix the outer circumference of the laminated rotor core 20 according to the diameter of the laminated rotor core 20.
The adjustable rotor core outer circumference fixing core jig 310 is configured to be arranged between fixing support blocks 310A fixed to an upper plate 32, to prevent the adjustable rotor core outer circumference fixing core jig 310 from deviating outwardly. Reference numeral 310B in the drawings refers to a support block for supporting the corner of the adjustable rotor core outer circumference fixing core jig 310.
In addition, the present invention fits the central shaft hole 21 and the guiding hole 24 of the laminated rotor core 20 into the core inner circumference fixing core jig 40 and the auxiliary fitting protrusion 40A at the same time, to seat the laminated rotor core 20 on the laminated rotor core seating part 31 while fixing the inner circumference of the laminated rotor core 20.
Accordingly, the inner circumference of the laminated rotor core 20 seated on the laminated rotor core seating part 31 is supported by the core inner circumference fixing core jig 40 and the auxiliary fitting protrusion 40A to be stably seated. The outer circumference of the laminated rotor core 20 is in tight contact with the inner curved surfaces 311A of the plurality of front pressure members 311 of the adjustable rotor core outer circumference fixing core jig 310 to be stably fixed and supported.
The rotor core seating part 31 having a plurality of cavities will be described in detail.
The rotor core seating part 31 comprises: a core inner circumference fixing core jig 40 coupled to the upper part of a coupling bolt 33A fastened to a support member 33 installed in the upper plate 32 of the lower mold 30; and an auxiliary fitting protrusion 40A coupled to a coupling bolt 41A fastened to a rotor core seating block 41 inserted and fitted into the upper outer circumference of the support member 33, wherein a plurality of adjustable rotor core outer circumference fixing core jigs 310 are configured to be arranged in a circle on the upper surface of the upper plate 32 in the outer circumference of the auxiliary fitting protrusion 40A.
A plurality of front pressure members 311 of the adjustable rotor core outer circumference fixing core jig 310 are seated on the upper surfaces of a plurality of protrusions 32A of the upper plate 32 corresponding thereto. The lower parts of pressure tight contact members 312 coupled to the front pressure members 311 are inserted and coupled to a plurality of guiding recessed 32B of the upper plate 32, such that the pressure tight contact member 312 is movable along the guiding recess 32B according to the thickness of a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and the fixing block 313.
Accordingly, the diameter of the rotor core seating part 31 can be smoothly adjustable to fit the diameters of laminated rotor cores 20 laminated separately according to the diameters of laminar members during a process for manufacturing laminar members, thereby allowing one apparatus 100 for molding a magnet of a rotor core to provide a plurality of cavities having spaces for different diameters, which enables mass production of laminated rotor cores 20 having different diameters by one apparatus 100 for molding a magnet of a rotor core.
The present invention illustrates a rotor core seating part 31 with four cavities. However, a rotor core seating part 31 with two cavities or six cavities may be arranged in one apparatus 100 for molding a magnet of a rotor core. For example, laminated rotor cores 20 having different diameters may be arranged in four cavities of the rotor core seating part 31 to perform molding, or laminated rotor cores 20 having the same diameter may be arranged in one or two cavities of the rotor core seating part 31 to perform molding. The diameters of laminated rotor cores 20 may be measured during a process of laminating rotor cores, and the diameters of the rotor core seating parts 31 may be adjusted manually according to the measured diameters of the laminated rotor cores 20, as above.
Particularly, when the upper mold 10 and the lower mold 30 are brought into contact with each other tens of or hundreds of times, and thus the plurality of front pressure members 311 having inner curved surfaces 311A of the adjustable rotor core outer circumference fixing core jig 310 which are in contact with the outer circumferential surface of laminated rotor cores 20 seated on the rotor core seating part 31 are worn away, resulting in reduction of a tight contact with the outer circumferential surface of the laminated rotor cores 20, the worn front pressure member 311 is separated from the pressure tight contact member 312 to be changed or the slide liner 314 for adjustment to fit the diameter of a laminated rotor core is changed, thereby reducing the costs for changing the adjustable rotor core outer circumference fixing core jig 310 and at the same time providing convenience in changing operation.
To specifically describe the plurality of adjustable rotor core outer circumference fixing core jigs 310, each of the inner curved surfaces 311A of the plurality of front pressure members 311 has an area corresponding to a quarter of the circular circumference, such that each of the inner curved surfaces 311A is in tight contact with the outer circumferential surface of a laminated rotor core 20, allowing stable tight-contact of the overall outer circumferential surface of the laminated rotor core 20 having a circular shape.
A coupling hole 311B formed in the center of the front pressure member 311 is configured to correspond to a coupling hole 312A formed in the center of the pressure tight contact member 312 to be coupled to each other by a coupling bolt B1, and a fitting wing piece 311C protruding backwardly of the front pressure member 311 is fitted into a fitting guiding groove 312B formed in the front of the pressure tight contact member 312 for precise assembling. The slide liner 314 for adjustment to fit the diameter of a laminated rotor core seated on a seating step 312C formed in the back of the pressure tight contact member 312 is coupled to the pressure tight contact member 312 by a coupling bolt B2, and the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core is configured to be in surface-contact with the inner surface of a fixing block 313 coupled to the upper plate 32 by a coupling bolt B3.
Accordingly, the slide liner 314 for adjustment to fit the diameter of a laminated rotor core, having a corresponding thickness can be smoothly changed according to the diameter of a laminated rotor core 20, while the overall outer circumferential surface of the laminated rotor core 20 is in tight contact with the inner curved surfaces 311A of the front pressure member 311. In the case of a laminated rotor core 20 having a greater diameter, the pressure tight contact member 312 is moved outwardly along the guiding recess 32B of the upper plate 32, thereby making the diameter of the rotor core seating part 31 greater. In the case of a laminated rotor core 20 having a smaller diameter, the pressure tight contact member 312 is moved inwardly along the guiding recess 32B of the upper plate 32, as shown in Fig. 6, thereby making the diameter of the rotor core seating part 31 smaller.
Fig. 7 is an overall longitudinal cross-sectional view of an apparatus 100 for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core 20 having a greater diameter is seated on a rotor core seating part 31. Fig. 8 is an overall longitudinal cross-sectional view of the apparatus 100 for molding a magnet of a rotor core according to the present invention, which is a view according to another embodiment in which a laminated rotor core 20 having a smaller diameter is seated on the rotor core seating part 31. Fig. 9 is a plan view of operation of pressing the outer circumferential surfaces of laminated rotor cores 20 having different diameters by an adjustable rotor core outer circumference fixing core jig 310, wherein the solid line indicates a laminated rotor core 20 having a greater diameter and the dash-dot line indicates a laminated rotor core 20 having a smaller diameter.
A spring SP is installed in the inner surface of the fixing block 313, wherein the front of the spring SP is brought into surface-contact with the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core, so as to strongly increase a pressure tight contact of the front pressure member 311 against the laminated rotor core 20 by elasticity of the spring SP, thereby firmly supporting the outer circumferential surface of the laminated rotor core 20.
Particularly, in the case of seating a laminated rotor core 20 having a greater diameter, while the adjustable rotor core outer circumference fixing core jig 310 is installed in the upper plate 32, as shown in Fig. 7, an inclined surface 311A' is formed around the upper part of the inner curved surface 311A of the front pressure member 311 for seating through smooth insertion, such that the laminated rotor core 20 is guided along the inclined surface 311A' of the inner curved surface 311A of the front pressure member 311 and seated while pressing the spring SP outwardly.
Meanwhile, in addition to diameter deviation, height deviation occurs due to different thicknesses of laminar members during a process for manufacturing laminar members. Thus, when applying a plurality of laminated rotor cores 20 to the apparatus 100 for molding a magnet of a rotor core having a plurality of cavities, the laminated rotor cores 20 seated on the respective rotor core seating parts 31 may have different heights.
In order to solve the problem, it is necessary to fill a molten resin material 80 into a molten resin filling space for fixing a magnet and a molten resin filling hole 22 by elastically supporting the laminated rotor cores 20 between the upper mold 10 and the lower mold 30 according to the heights of the laminated rotor cores 20 freely without calibrating the apparatus 100 for molding a magnet of a rotor core.
Fig. 10 is a partial cross-sectional view for explaining an ascending and descending support 50 in an apparatus 100 for molding a magnet of a rotor core according to the present invention.
The present invention may provide the ascending and descending support 50 in the lower end of a rotor core seating block 41 installed below the plurality of laminated rotor core seating parts 31, to fit the height of a laminated rotor core 20.
The ascending and descending support 50 may comprise an ascending and descending support member 51 installed in a plurality of grooves 32C formed in the upper plate 32 of the lower mold 30; and a plurality of elastic members 53 formed of a dish-shaped circular plate spring in a guiding fixing bolt 52 fastened and coupled to the ascending and descending support member 51.
Preferably, the upper plate 32 has four grooves 32C, and the ascending and descending support member 51 fitted into the groove 32C is elastically supported by the elastic member 53 to ascend and descend.
To fit high or low height of a laminated rotor core 20, the ascending and descending support member 51 elastically supports the rotor core seating block 41 by elasticity of the elastic member 53, such that the upper surface of the laminated rotor core 20 is brought into tight contact with the lower surface of the central fixing block 11A of the lower plate 11 of the upper mold 10 without clearance, and the lower surface of the laminated rotor core 20 is maintained to be in tight contact with the upper surface of the rotor core seating block 41 without clearance. Thereby, the molten resin material 80 may be stably filled into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole, without leakage.
Accordingly, the molten resin material 80 is injected while the upper and lower surfaces of the laminated rotor core 20 are maintained to be in tight contact without clearance by elasticity of the elastic member 53. Thus, no burr occurs in the upper and lower surfaces of the molten resin material 80 filled in the laminated rotor core 20, thereby capable of omitting a process for removing burr and significantly improving the productivity as well as improving the quality of laminated rotor cores 20.
The number of elastic members 53 formed of a dish-shaped circular plate spring is determined according to the height of the laminated rotor core 20 by elasticity (elastic force and repulsive force), and the elastic member 53 is fitted into the guiding fixing bolt 52 and also the ascending and descending support member 51 is fastened to the guiding fixing bolt 52, thereby screw-coupling and fastening the guiding fixing bolt 52. When the elasticity of the elastic member 53 decreases due to the use for a long time, the guiding fixing bolt 52 may be smoothly unscrewed to change the elastic member 53 or the number of elastic members 53 may be easily increased or decreased according to the height of the laminated rotor core 20. Accordingly, the elastic pressure of the elastic member 53 may be adjusted according to the height of the laminated rotor core 20 freely without calibrating the apparatus 100 for molding a magnet of a rotor core, thereby achieving economic benefits through time saving as well as reduction of costs to be incurred to calibrate the apparatus 100 for molding a magnet of a rotor core.
The number of elastic members 53 may be increased or decreased by calculating the load of the elastic member 53 in correspondence to an injection pressure according to the height of the laminated rotor core 20.
When the molten resin material 80 is filled in a laminated rotor core 20 and cured, and then the laminated rotor core 20 is taken out of the rotor core seating part 31, the elastic member 53 pressed springs as the upper mold 10 and the lower mold 30 are separated from each other, and thus the rotor core seating block 41 is lifted up to push the laminated rotor core 20 upwardly, capable of taking out the laminated rotor core 20 in which laminar members are adhered by the molten resin.
Fig. 11 is a cross-sectional view of an apparatus 100 for molding a magnet of a rotor core according to the present invention in an operation state. Fig. 12 is a perspective view of a laminated rotor core 20 in which a molten resin material 80 is filled according to the present invention.
The present invention having the above configuration may distribute a molten resin injected from an injection molten resin supply nozzle 10-1 of the upper mold 10, by a hot runner in the lower plate 11 of the upper mold 10, while a laminated rotor core 20 is seated on the rotor core seating part 31 and then the upper mold 10 and the lower mold 30 are brought into contact with each other, inject the injection molten resin through a plurality of injection resin material supply holes (not shown) formed through the circumference of a central fixing block 11A of the lower plate 11 of the upper mold 10 to be filled into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23, and allow the molten resin material 80 filled into the molten resin filling hole 22 of the laminated rotor core 20 to adhere laminar members of the laminated rotor core 20.
The rotor core seating block 41 may support a magnet M inserted into the magnet insertion hole 23 of the laminated rotor core 20 not to be separated therefrom.
When filling the molten resin material 80 into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23, the molten resin material 80 for fixing the magnet M is filled while the upper surfaces of magnets M inserted into a plurality of magnet insertion holes 23 into which the magnets M are inserted are elastically in surface-contact with the lower surfaces of pressure members 11B installed in the central fixing block 11A of the lower plate 11 of the upper mold 10. Thereby, the magnets M are neither inclined nor biased in one direction inside the magnet insertion holes 23, and the molten resin material 80 is evenly filled into a gap between the outer circumference of a magnet M inserted into a magnet insertion hole 23 and the inner circumferential surface of the magnet insertion hole 23, as shown in Fig. 12, thereby increasing the fixing of the magnet M. The pressure member 11B is elastically pressed by a spring of the upper mold 10 to allow the magnet M to be maintained in a fixed state when the lower surface of the central fixing block 11A of the lower block 11 of the upper mold 10 is in tight contact with the upper surface of the laminated rotor core 20.
It should be noted that the description of the present invention described above is merely an example for understanding the present invention, and is not intended to limit the scope of the present invention. It would be obvious to a person skilled in the art that various modifications and alternations other than embodiments described above can be made within the scope without deviating from the essential features of the present embodiments. In addition, it should be construed that differences associated with the modifications and alternations fall within the scope of the present invention defined by the accompanying claims.

Claims (7)

  1. An apparatus 100 for molding a magnet of a rotor core including an upper mold 10 and a lower mold 30, the apparatus seating a laminated rotor core 20 on a laminated rotor core seating part 31 in the lower mold 30, and then injecting an injection molten resin from the upper mold 10 through an injection molten resin supply nozzle 10-1, to fill a molten resin material 80 into a molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of a magnet and the inner circumferential surface of a magnet insertion hole 23, the apparatus comprising:
    a plurality of laminated rotor core seating parts 31 having multiple cavities, installed in the upper part of an upper plate 32 of the lower mold 30; and
    an ascending and descending support 50 in the lower end of a rotor core seating block 41 installed below the plurality of laminated rotor core seating parts 31, to fit the height of the laminated rotor core,
    wherein the molten resin material 80 is filled into the molten resin filling hole 22 of the laminated rotor core 20 and into a gap between the circumferential surface of the magnet and the inner circumferential surface of the magnet insertion hole 23, while the outer circumference and upper and lower surfaces of the laminated rotor core 20 seated on the laminated rotor core seating part 31 are fixed corresponding to the diameter and height of the laminated rotor core 20.
  2. The apparatus of claim 1, wherein the rotor core seating part 31 comprises a core inner circumference fixing core jig 40 coupled to the upper part of a coupling bolt 33A fastened to a support member 33 installed in the upper plate 32 of the lower mold 30; and an auxiliary fitting protrusion 40A coupled to a coupling bolt 41A fastened to a rotor core seating block 41 inserted and fitted into the upper outer circumference of the support member 33, wherein a plurality of adjustable rotor core outer circumference fixing core jigs 310 are configured to be arranged on the upper surface of the upper plate 32 in the outer circumference of the auxiliary fitting protrusion 40A.
  3. The apparatus of claim 2, wherein each of the plurality of adjustable rotor core outer circumference fixing core jigs 310 comprises a plurality of front pressure members 311 having inner curved surfaces 311A; a pressure tight contact member 312 installed in the back end of each of the front pressure members 311; a slide liner 314 for adjustment to fit the diameter of a laminated rotor core, installed between the pressure tight contact member 312 and a fixing block 313, to fix the outer circumference of the laminated rotor core 20 according to the diameter of the laminated rotor core 20.
  4. The apparatus of claim 3, wherein each of the inner curved surfaces 311A of the plurality of front pressure members 311 is in tight-contact with the outer circumferential surface of the laminated rotor core 20, to stably tight-contact the overall outer circumferential surface of the laminated rotor core 20 having a circular shape.
  5. The apparatus of claim 3, wherein a coupling hole 311B formed in the center of the front pressure member 311 is configured to correspond to a coupling hole 312A formed in the center of the pressure tight contact member 312 to be coupled to each other by a coupling bolt B1, a fitting wing piece 311C protruding backwardly of the front pressure member 311 is fitted into a fitting guiding groove 312B formed in the front of the pressure tight contact member 312 for precise assembling, the slide liner 314 for adjustment to fit the diameter of a laminated rotor core seated on a seating step 312C formed in the back of the pressure tight contact member 312 is coupled to the pressure tight contact member 312 by a coupling bolt B2, and the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core is configured to be in surface-contact with the inner surface of a fixing block 313 coupled to the upper plate 32 by a coupling bolt B3.
  6. The apparatus of claim 3, wherein a spring SP is installed in the inner surface of the fixing block 313, and the front of the spring SP is brought into surface-contact with the back surface of the slide liner 314 for adjustment to fit the diameter of a laminated rotor core.
  7. The apparatus of claim 1, wherein the ascending and descending support 50 comprises an ascending and descending support member 51 installed in a plurality of grooves 32C formed in the upper plate 32 of the lower mold 30; and a plurality of elastic members 53 formed of a dish-shaped circular plate spring in a guiding fixing bolt 52 fastened and coupled to the ascending and descending support member 51.
PCT/KR2023/010811 2022-09-19 2023-07-26 Apparatus for resin molding of rotor core magnet WO2024063298A1 (en)

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KR1020220117823A KR20240039362A (en) 2022-09-19 2022-09-19 Apparatus for resin molding of rotor core magnet
KR10-2022-0117823 2022-09-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0544517U (en) * 1991-11-26 1993-06-15 三田工業株式会社 Injection mold
KR101209527B1 (en) * 2011-10-21 2012-12-11 주식회사 테크웰시스템 Molding block and apparatus for molding an electric device and method of molding an electrical device
KR20130107890A (en) * 2012-03-23 2013-10-02 삼성전기주식회사 Injection mold of lens
JP2020110817A (en) * 2019-01-10 2020-07-27 株式会社三井ハイテック Metal mold device
KR20220084954A (en) * 2020-12-14 2022-06-21 심완보 EMC mold for fixing magnets of electric motors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0544517U (en) * 1991-11-26 1993-06-15 三田工業株式会社 Injection mold
KR101209527B1 (en) * 2011-10-21 2012-12-11 주식회사 테크웰시스템 Molding block and apparatus for molding an electric device and method of molding an electrical device
KR20130107890A (en) * 2012-03-23 2013-10-02 삼성전기주식회사 Injection mold of lens
JP2020110817A (en) * 2019-01-10 2020-07-27 株式会社三井ハイテック Metal mold device
KR20220084954A (en) * 2020-12-14 2022-06-21 심완보 EMC mold for fixing magnets of electric motors

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