KR20230135915A - Manufacturing method for laminated core - Google Patents

Abstract

The present invention relates to a method of manufacturing a laminated core by adhering lamina members, which involves sequentially forming a lamina member of a predetermined shape by applying an adhesive while passing a thin plate with an adhesive layer formed on the surface, followed by blanking. A laminated core forming step of forming a laminated core pre-bonded with the adhesive by stacking the lamina members without heat-curing the adhesive layer; a magnet insertion step of inserting a magnet into a magnet insertion hole of the laminated core; A resin filling step of filling the magnet insertion hole of the laminated core into which the magnet is inserted, and heating the resin-filled laminated core to cure the adhesive layer of the lamina member to integrate the laminated core and simultaneously cure the filled resin. It includes a curing step. In this way, by heating the resin-filled laminated core and curing the adhesive layer of the lamina member, the laminated core can be integrated and the filled resin can be cured at the same time, simplifying the manufacturing process and reducing manufacturing time and cost. You can achieve certain effects.

Description

Manufacturing method of laminated core {MANUFACTURING METHOD FOR LAMINATED CORE}

The present invention relates to a method of manufacturing a laminated core, and more specifically, to a method of manufacturing a laminated core by bonding lamina members.

A motor is a mechanical device that obtains rotational power from electrical energy and includes a stator and a rotor. The rotor interacts electromagnetically with the stator and rotates with the force exerted by the magnetic field and the current flowing in the coil.

The stator refers to a stationary part of a rotating device such as a motor, that is, a fixed part that does not rotate. For example, in the case of an induction machine, the stator is composed of a stator core and a stator winding.

The rotor and stator may be made of a laminated core manufactured by stacking several layers of lamina members, which are thin metal plates, and then integrating them.

As a method of manufacturing the laminated core, a method of integrally fixing multiple laminated lamina members using a welding fixing method using laser welding or a rivet fixing method is known.

However, when integrating lamina members laminated by a welding fixing method, there is a problem in that the lamina members undergo thermal deformation due to welding heat and change their physical properties.

Accordingly, recently, an adhesive fixing method has been proposed in which the lamina members, which are unit plates of the laminated core, are integrated by bonding each other with an adhesive, such as Korean Patent Publication No. 10-1996-003021 and Japanese Patent Publication No. 5-304037. The above adhesive fixation method is disclosed in No.

Referring to Japanese Patent Application Laid-Open No. 5-304037 among the above-mentioned patent documents, a steel plate as a material for manufacturing a motor core is supplied to the first press molding machine and the second press molding machine by a transfer roller, and passes through the first press molding machine. Adhesive is previously applied to the steel sheet by an application roller and nozzle.

In addition, the lamina members sequentially stacked in the internal space of the first press molding machine and the second press molding machine by blanking the materials are integrated with the adhesive, and an adhesive laminated core is manufactured through this. According to this conventional manufacturing method of an adhesive laminated core, the cost can be reduced compared to laser welding and the steel plate can respond to thinning.

However, when applying the adhesive laminated core manufacturing method, the adhesive must be first cured by heating after stacking the lamina members, and then resin must be injected to fix the magnet to the laminated core and then secondarily cured again. Therefore, the work process becomes complicated and there is a problem that thermal deformation may occur in the laminated core due to multiple heat treatment processes.

Republic of Korea Patent Publication No. 10-1996-003021 (January 26, 1996) Japanese Patent Publication No. 5-304037 (1993.11.16)

The present invention was created to solve the above problems, and its purpose is to provide a method for manufacturing a laminated core that can simultaneously cure the adhesive layer of the lamina member and the filled resin by heating the laminated core.

In order to achieve the above object, the method of manufacturing a laminated core according to a preferred embodiment of the present invention involves applying an adhesive while passing a thin plate with an adhesive layer formed on the surface, and then sequentially forming a lamina member of a predetermined shape by blanking. A laminated core forming step of forming and stacking the lamina members without heating and curing the adhesive layer to form a laminated core pre-adhered with the adhesive; A magnet insertion step of inserting a magnet into the magnet insertion hole of the laminated core; A resin filling step of filling the magnet insertion hole of the laminated core into which the magnet is inserted with resin; and a curing step of heating the resin-filled laminated core to cure the adhesive layer of the lamina member to integrate the laminated core and simultaneously cure the filled resin.

Here, the step of forming the laminated core includes a hole forming step of forming a common hole by punching the thin plate; An adhesive application step of applying adhesive to a portion of the thin plate where no perforation is formed; A lamina member manufacturing step of sequentially forming a lamina member having a common perforation by blanking the thin plate; and a lamina member preliminary adhesion step of pre-adhering a plurality of lamina members to form the laminated core by stacking and pressing the lamina members.

That is, the laminated core forming step may be performed by applying an adhesive that hardens at room temperature, blanking the lamina member to which the adhesive is applied, and then stacking and pressing to form a pre-bonded laminated core.

The curing step includes a pressing step of pressing the laminated core filled with resin; A heating step of heating the pressurized laminated core; and a cooling step of cooling the heated laminated core.

Here, the pressurizing step may be performed to pressurize the laminated core at a pressure of 1 to 15 MPa.

Additionally, the heating step may be performed at a temperature range of 110 to 210°C for 120 to 230 seconds.

The resin filling step includes a carrier tray seating step of disposing a carrier tray on which the laminated core is seated and a communication hole communicating with the magnet insertion hole is formed between the upper mold and the lower mold; A core pressing step of pressing the laminated core with the upper mold and the lower mold; and a resin injection step of injecting resin into the magnet insertion hole through the communication hole using a resin supply unit provided in the lower mold.

The core pressing step may be performed to pressurize the entire upper side of the laminated core with the same pressure.

According to the manufacturing method of the laminated core according to the present invention, the laminated core filled with the resin is heated to cure the adhesive layer of the lamina member, thereby integrating the laminated core and curing the filled resin at the same time, thereby simplifying the manufacturing process. This can have the effect of reducing manufacturing time and costs.

1 is a flowchart schematically showing a method of manufacturing a laminated core according to an embodiment of the present invention;
Figure 2 is a flowchart schematically showing the laminated core forming step in the method for manufacturing a laminated core according to an embodiment of the present invention;
Figure 3 is a flow chart schematically showing the resin filling step in the manufacturing method of a laminated core according to an embodiment of the present invention;
Figure 4 is a flowchart schematically showing the curing step in the method of manufacturing a laminated core according to an embodiment of the present invention;
Figure 5 is a diagram schematically showing a core mold used in the manufacturing method of a laminated core according to an embodiment of the present invention;
Figure 6 is a diagram schematically showing a laminated core and a carrier tray manufactured in a core mold used in the method of manufacturing a laminated core according to an embodiment of the present invention;
Figure 7 is a diagram schematically showing a resin filling device used in the manufacturing method of a laminated core according to an embodiment of the present invention;
Figure 8 is a diagram schematically showing the main parts of the resin filling device used in the manufacturing method of the laminated core according to an embodiment of the present invention;
Figure 9 is a diagram schematically showing a state in which the center base is pressed by the upper mold and the lower mold in the resin filling device used in the method of manufacturing a laminated core according to an embodiment of the present invention;
Figure 10 is a diagram schematically showing a state in which the resin supply unit operates to inject resin into the magnet insertion hole in the resin filling device used in the manufacturing method of the laminated core according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted as including all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries can be interpreted as having meanings consistent with the meanings they have in the context of related technologies, and unless clearly defined in this application, are interpreted as having an ideal or excessively formal meaning. It may not work.

Hereinafter, specific embodiments of the present invention will be described with reference to the attached drawings.

Figure 1 is a flowchart schematically showing a method of manufacturing a laminated core according to an embodiment of the present invention, Figure 2 is a flowchart schematically showing the laminated core forming step in the method of manufacturing the laminated core, and Figure 3 is a flowchart of the laminated core. It is a flowchart schematically showing the resin filling step in the manufacturing method, and Figure 4 is a flowchart schematically showing the curing step in the manufacturing method of the laminated core.

In addition, Figures 5 and 6 are diagrams schematically showing a core mold according to another embodiment and the laminated core and carrier tray manufactured thereby, and Figures 7 to 10 show the resin used in the manufacturing method of the laminated core. This is a diagram schematically showing the filling device.

1 to 10, the method for manufacturing a laminated core according to an embodiment of the present invention is

An adhesive is applied while passing through a thin plate (S) with an adhesive layer formed on the surface, and then blanked to sequentially form a lamina member (L) of a predetermined shape and laminated, but without heat-hardening the adhesive layer, the lamina member ( A laminated core forming step (S100) of stacking L) to form a laminated core (C) pre-bonded with the adhesive, and a magnet inserting a magnet (M) into the magnet insertion hole (C1) of the laminated core (C) An insertion step (S200), a resin filling step (S300) of filling the magnet insertion hole (C1) of the laminated core (C) into which the magnet (M) is inserted, and heating the resin-filled laminated core to It includes a curing step (S400) of curing the adhesive layer of the lamina member (L) to integrate the laminated core and simultaneously curing the filled resin.

The conventional laminated core manufacturing method is to manufacture a laminated core by forming a lamina member and stacking thin plates with an adhesive layer on the surface, which involves manufacturing lamina members in a core mold and stacking them to form a laminated core, and then stacking them in the core mold. The core was heated to harden the adhesive layer and the lamina members were integrated to form a laminated core.

Then, after inserting a magnet into the magnet insertion hole of the laminated core, resin was filled to fix the magnet, and the laminated core was heated again to cure the resin.

As such, the conventional method of manufacturing a laminated core requires heating and hardening twice, which makes the work process complicated, and there is a problem that thermal deformation may occur in the laminated core due to multiple heat treatment processes. In addition, since the core mold must be equipped with a heating device and a cooling device, there was a problem of increasing the manufacturing cost and maintenance and repair cost of the core mold.

Therefore, in the present invention, the step of heat curing in the core mold is omitted, and after filling the laminated core with resin, the laminated core is heated to cure the adhesive layer of the lamina member to integrate the laminated core and simultaneously cure the filled resin. Provides a method for manufacturing a laminated core.

Below, each step of the method for manufacturing a laminated core according to an embodiment of the present invention will be described in more detail.

The laminated core forming step (S100) is a step of sequentially forming lamina members (L) of a predetermined shape and stacking them while passing a thin plate (S) with an adhesive layer formed on the surface to form a laminated core (C). This laminated core forming step (S100) can be performed using the core mold 10 shown in FIG. 5.

More specifically, the laminated core forming step (S100) includes a hole forming step (S110) of punching the thin plate (S) to form a common perforation, and a portion of the thin plate (S) in which no perforation is formed. An adhesive application step (S120) of applying an adhesive to the lamina member manufacturing step (S130) of sequentially forming a lamina member (L) with a common perforation by blanking the thin plate (S), and the lamina It may include a lamina member preliminary adhesion step (S150) of preliminarily adhering a plurality of lamina members (L) to form the laminated core (C) by stacking and pressing the members (L).

For this purpose, the core mold 10 used in the manufacturing method of the laminated core according to the embodiment of the present invention includes a slot punch 13, a shaft hole punch 15, an adhesive application portion 16, and a blanking. It may include part 17.

The core mold 10 is a press-based device and is divided into an upper mold 11 and a lower mold 12, and the upper mold 11 includes punches 13, 15, and 17 for punching or blanking the thin plate S by pressing it. ) are provided.

In addition, the lower mold 12 is formed with punch holes 13a, 15a, and 17a corresponding to the punches 13, 15, and 17, and a laminated barrel (in which the lamina members L are stacked and pressed). 18) is provided.

More specifically, the slot punch 13 and the shaft hole punch 15 are provided to form a common perforation in the thin plate (S).

In addition, the blanking portion 17 is provided in the upper mold 11, and a blanking hole 17a facing the blanking portion 17 is formed in the lower mold 12, and the blanking portion 17 The lamina member (L) blanked from the thin plate (S) is inserted into the laminated barrel 18 and stacked on the laminated core transfer unit 19 provided in the laminated barrel 18.

The adhesive application part 16 is provided at the front end of the blanking part 17 in the lower mold 12 and is a thin plate (S) in which a common perforation is formed through the slot punch 13 and the shaft hole punch 15. It is provided to apply the adhesive to the area where the perforation is not formed.

In addition, the adhesive applicator 16 operates so as not to apply adhesive to the first lamina member for forming the laminated core (C).

That is, since the first lamina member to form the laminated core (C) is laminated on the laminated core transfer unit 19, an adhesive is used to prevent the first lamina member from being attached to the laminated core transfer unit 19. It operates so as not to spread.

As an example, the adhesive application portion 16 is formed on the lower mold 12 and includes a storage portion 16a that accommodates the adhesive, and is connected to the storage portion 16a to apply the adhesive to the lower side of the thin plate S. It may be composed of a nozzle unit 16b for applying the adhesive, and a pump 16c that provides pressure to the storage unit 16a so that the adhesive stored in the storage unit 16a is discharged to the nozzle unit 16b. Of course, the configuration of the adhesive applicator 16 is not limited to this, and various types of conventional adhesive applicator parts may be applied.

Additionally, the adhesive may be an adhesive that can be bonded at room temperature. As an example, the adhesive may be an acrylic adhesive that hardens in a temperature range of 0 to 80°C.

That is, an adhesive that hardens at room temperature is applied, the lamina member to which the adhesive is applied is blanked, and then laminated and pressed in the lamination barrel 18 to form a lamina member (L) through the adhesive at room temperature without separate heat-curing. ) can form a pre-bonded laminated core (C).

The magnet insertion step (S200) is a step of inserting a magnet into the magnet insertion hole (C1) of the laminated core (C) while the laminated core (C) is placed on the carrier tray (120).

And, the resin filling step (S300) is a step of filling the magnet insertion hole (C1) of the laminated core (C) into which the magnet (M) is inserted with resin.

More specifically, in the resin filling step (S300), the upper mold 200 and the carrier tray 120 on which the laminated core (C) is seated and the communication hole 123 communicating with the magnet insertion hole (C1) is formed. A carrier tray seating step (S310) disposed between the lower mold 400, a core pressing step (S320) of pressing the laminated core (C) with the upper mold 200 and the lower mold 400, and It may include a resin injection step (S330) of injecting resin into the magnet insertion hole (C1) through the communication hole (123) using the resin supply unit (410) provided in the lower mold (400).

This resin filling step (S300) can be performed through the resin filling device 100 shown in FIGS. 7 to 10.

Below, the resin filling device 100 will be described in more detail with reference to FIGS. 7 to 10.

The resin filling device 100 includes a base frame 110, an upper mold 200 provided on the base frame 110, and a lower portion provided on the base frame 110 to face the upper mold 200. A mold 400, a center base 300 disposed between the upper mold 200 and the lower mold 400, and a resin supply unit for injecting resin into the magnet insertion hole C1 of the laminated core C. It can be done including (410).

The base frame 110 forms the outer shape of the resin filling device 100. As an example, the base frame 110 may be equipped with press equipment to move at least one of the upper mold 200 and the lower mold 400 in the vertical direction.

The upper mold 200 is provided on the upper side of the base frame 110. Additionally, the upper mold 200 is provided to press the upper side of the laminated core (C) while injecting resin into the magnet insertion hole (C1) of the laminated core (C).

The lower mold 400 is provided on the base frame 110 to face the upper mold 200. And, the lower mold 400 is installed on the carrier so that the upper side of the laminated core (C) is pressed by the upper mold 200 while the resin is injected into the magnet insertion hole (C1) of the laminated core (C). Provided to pressurize the tray 120.

That is, the upper mold 200 and the lower mold 400 press the laminated core C placed on the carrier tray 120 from both sides and inject resin into the magnet insertion hole C1. can be provided.

The center base 300 is disposed between the upper mold 200 and the lower mold 400 and is movable in the vertical direction.

As an example, the center base 300 is disposed between the upper mold 200 and the lower mold 400 and includes a base plate 310 on which the carrier tray 120 is seated, and one end of the base plate ( It may include a plurality of guide parts 320 that are fastened along the circumference of 310 and the other side of which is inserted into the upper mold 200 and slides.

With this configuration, when the upper mold 200 moves downward or the lower mold 400 moves upward while the lower side of the base plate 310 is in contact with the lower mold 400, the lower mold 400 moves upward. As the guide portion 320 is inserted into the upper mold 200, the upper side of the base plate 310 may move to contact the upper mold 200.

That is, the center base 300 may be configured so that its upper side selectively contacts the upper mold 200 and its lower side selectively contacts the lower mold 400. At this time, the laminated core C placed on the carrier tray 120 may be pressed by the upper mold 200 and the lower mold 400.

The base plate 310 is formed with a through hole 311 passing through the center, so that the resin supply unit 410 can be inserted. That is, the lower side of the carrier tray 120 is exposed through the through hole 311, and the resin supply unit 410 inserted into the through hole 311 is in close contact with the lower side of the carrier tray 120. It can be. Through this, the resin supplied from the resin supply unit 410 can pass through the communication hole 123 of the carrier tray 120 and be supplied to the magnet insertion hole C1 of the laminated core C.

Additionally, the base plate 310 may be provided with a clamp 330 that fixes the position of the carrier tray 120.

The clamp 330 may fix the carrier tray 120 mounted on the base plate 310 to be located at the upper center of the through hole 311. At this time, the fastening position of the carrier tray 120 may be set by the clamp 330 so that the communication hole 123 of the carrier tray 120 is located above the resin supply unit 410.

The carrier tray 120 has a laminated core (C) with magnets (M) inserted into a plurality of magnet insertion holes (C1), is placed on the center base (300), and has the magnet insertion holes (C1) and A communicating hole 123 may be formed.

As an example, the carrier tray 120 includes a plate portion 121 on which the laminated core (C) is seated, and a through hole that protrudes from the center of the plate portion 121 and is formed through the center of the laminated core (C). It may include a protrusion 122 inserted into.

Additionally, a communication hole 123 may be formed in the plate portion 121 to allow the resin supplied from the resin supply portion 410 to flow.

Here, the communication hole 123 may be formed at a position corresponding to each position of the plurality of magnet insertion holes (C1) formed in the laminated core (C). That is, the resin injected through one communication hole 123 can be supplied to one magnet insertion hole C1.

As such, the communication hole 123 may be formed in a shape in which the diameter becomes smaller as it moves in the thickness direction. That is, the large-diameter portion of the communication hole 123 may be connected to the resin supply unit 410, and the small-diameter portion of the communication hole 123 may be connected to the magnet insertion hole C1. .

In addition, a guide protrusion (not shown) is formed on one of the protrusions 122 and through holes of the laminated core C, and a slit (not shown) is formed on the other, so that the laminated core is inserted into the protrusion 122. The position of (C) can be set in advance.

That is, when the laminated core (C) is placed on the carrier tray 120, the magnet insertion hole (C1) formed in the laminated core (C) is on the communication hole 123 formed in the carrier tray 120. must be located

Accordingly, guide protrusions and slits are formed on the protrusion 122 and the through hole of the laminated core (C) to position the laminated core (C) so that the magnet insertion hole (C1) is located on the communication hole (123). It can be placed on the carrier tray 120.

The resin supply unit 410 is provided in the lower mold 400, and the communication hole 123 is opened in a state in which the laminated core C is pressed by the upper mold 200 and the lower mold 400. Resin can be injected into the magnet insertion hole (C1) through.

As an example, the resin supply unit 410 is arranged to be movable inside the resin supply port 411 and the resin supply port 411 where the resin is disposed, and presses the molten resin into the magnet insertion hole (C1). It may include a resin supply piston 412 to inject, and a resin supply actuator 413 to move the resin supply piston 412 in the vertical direction.

Here, the resin may be, for example, EMC (Epoxy Molding Compound), and the block-shaped EMC may be inserted into the resin supply port 411, heated, melted, and then injected.

With this configuration, a block-shaped resin (BS) is inserted into the resin supply port 411, and the upper mold 200 and the lower mold 400 are brought into contact with both sides of the center base 300 to stack the resin. After pressurizing the core (C) and heating the resin supply port 411 to melt the resin, the resin supply actuator 413 moves the resin supply piston 412 to transfer the molten resin into the magnet insertion hole ( It can be injected into C1).

Here, the upper mold 200 and the lower mold 400 are heated to a certain temperature while the resin is being filled so that the molten resin can be completely filled in the magnet insertion hole (C1) of the laminated core (C) without solidifying. A heating device (not shown) that maintains this may be provided.

At least one resin supply unit 410 may be provided corresponding to the communication hole 123 of the carrier tray 120. As an example, a plurality of the resin supply units 410 may be provided, and one resin supply unit 410 may be configured to supply resin to at least one or two communication holes 123 .

Hereinafter, the operation of fixing the magnet (M) by injecting resin into the magnet insertion hole (C1) of the laminated core (C) using the resin filling device 100 according to an embodiment of the present invention will be described in order.

First, a laminated core (C) is placed on the carrier tray 120, and a magnet (M) is inserted into the magnet insertion hole (C1) of the laminated core (C). At this time, the magnet insertion hole C1 is located on the communication hole 123 of the carrier tray 120.

Then, the laminated core (C) with the magnet (M) inserted into the carrier tray 120 is preheated together, and then the carrier tray 120 on which the laminated core is placed is seated on the center base 300. .

Then, at least one of the upper mold 200 and the lower mold 400 is moved to come into close contact with both surfaces of the center base 300 to press the laminated core C.

For example, the lower mold 400 moves upward and contacts the lower side of the center base 300, and the resin supply unit 410 is disposed on the lower side of the carrier tray 120.

At this time, in order to accurately position the joining position of the lower mold 400 and the central base 300, the first guide protrusion 401 formed on the lower mold 400 is formed on the central base 300. 1 It may be configured to be inserted into the guide groove 312.

In addition, in order to accurately position the communication hole 123 of the carrier tray 120 and the resin supply unit 410, a second guide protrusion 402 formed on the lower mold 400 is provided on the carrier tray ( It may be configured to be inserted into the second guide groove 124 formed in 120).

Then, the upper mold 200 or the lower mold 400 moves additionally so that the upper mold 200 contacts the upper surface of the center base 300.

At this time, in order to accurately position the coupling position of the upper mold 200 and the center base 300, the third guide protrusion 403 formed on the lower mold 400 is formed on the upper mold 200. 3 It may be configured to be inserted into the guide groove 201.

In this case, the resin supply unit 410 is in close contact with the lower side of the carrier tray 120 and communicates with the communication hole 123, and the core pressing unit 210, described below, is attached to the upper side of the laminated core (C). It is in close contact with the side and pressurizes the laminated core (C) with a certain pressure.

Then, the resin supply unit 410 is operated to inject the molten resin into the magnet insertion hole C1 through the communication hole 123.

Then, after the resin injection is completed and the time for the resin to harden has elapsed, the upper mold 200 and the lower mold 400 are spaced apart from the center base 300.

At this time, the residual resin remaining after being supplied to the magnet insertion hole (C1) remains on the resin supply unit 410. That is, in the process of separating the lower mold 400 and the central base 300, the residual resin does not remain on the carrier tray 120, but all remains on the resin supply unit 410.

In addition, by separating the laminated core (C) from the carrier tray 120, the laminated core (C) with the magnet fixed to the magnet insertion hole (C1) can be manufactured without any additional residual resin removal work.

The core pressurizing step (S320) may be performed to pressurize the entire upper side of the laminated core with the same pressure.

To this end, the resin filling device 100 may be provided in the upper mold 200 and may further include a core pressing unit 210 that presses the upper side of the laminated core (C).

That is, in a state where the lower side of the center base 300 is supported in contact with the lower mold 400 and the upper side is supported in contact with the upper mold 200, the core pressing portion 210 is supported by the lamination. It is in close contact with the upper side of the core (C) to press the laminated core (C).

As an example, the core pressing unit 210 is provided on the upper mold 200 and a pressing plate 211 in contact with the upper side of the laminated core (C), and moves the pressing plate 211 to pressurize the laminated core (C). It may include a pressurizing actuator 212 that pressurizes the core C.

Here, the pressure actuators 212 are provided in plurality, and can operate at least the same or differently to press the pressure plate 211.

The laminated core (C) is manufactured by stacking a plurality of plates, and height deviation of the laminated core (C) may occur due to the manufacturing process or variation in the thickness of the plates. That is, the upper side with which the core pressing part 210 contacts may be formed to be inclined.

In this case, when the core pressing unit 210 presses with a certain force in the vertical direction, the high portion of the inclined upper side of the laminated core C is preferentially pressed by contact with the core pressing unit 210. , different pressing forces are applied overall to the laminated core (C).

That is, the high portion of the inclined upper side of the laminated core (C) is preferentially pressed and pressed with a relatively large pressing force, causing a problem that the laminated core (C) may be damaged. In addition, a relatively small pressing force is applied to a low portion of the inclined upper side of the laminated core (C), so there is a problem in that an uneven pressing force is applied to the entire laminated core (C).

Therefore, in order to solve this problem, the resin filling device 100 according to an embodiment of the present invention is equipped with a plurality of pressurizing actuators 212 and can pressurize the pressurizing plate 211 with at least the same or different pressing force. there is.

As an example, the pressure actuators 212 are provided in four pieces and are spaced radially at regular intervals based on the center of the laminated core (C) to operate the upper side of the laminated core (C) differently at 4 points. It may be configured to pressurize the pressing plate 211.

With this configuration, the pressure actuators 212 are provided in four pieces, and if the laminated core C is formed to be inclined, when the four pressure actuators 212 move with the same displacement, the pressure plate 211 The laminated core (C) is partially pressed.

Accordingly, each of the pressure actuators 212 is provided to enable pressure control, so that each of the pressure actuators 212 can be controlled to press the pressure plate 211 with the same pressure. Through this, the pressure plate 211 can be controlled to press the laminated core C with the same overall pressure.

The curing step (S400) is a step of heating the resin-filled laminated core to harden the adhesive layer of the lamina member to integrate the laminated core and simultaneously cure the filled resin.

That is, in the present invention, the step of heat-hardening the adhesive layer in the core mold is omitted, and after filling the laminated core with resin, the laminated core is heated to cure the adhesive layer of the lamina member to integrate the laminated core and the filled resin. It is made to harden at the same time.

More specifically, the curing step (S400) includes a pressing step (S410) of pressing the resin-filled laminated core, a heating step (S420) of heating the pressurized laminated core, and a cooling step of cooling the heated laminated core. It may be accomplished including (S430).

The pressing step (S410) is a step of placing the resin-filled laminated core in a press device or a separate jig device and pressurizing the laminated core with a pressure of 1 to 15 MPa. Here, the pressure pressing the laminated core corresponds to an example and may be changed depending on various conditions such as the laminated thickness and size of the laminated core and the thickness of the lamina member.

That is, the pressing step (S410) is a process of bringing the lamina members into close contact without any voids when the adhesive layer formed between the lamina members melts in the subsequent heating step (S420).

And, in the pressing step (S410), a release agent is applied to both sides of the laminated core or to the portion in contact with both sides of the laminated core in the device for pressing the laminated core, so that the laminated core is attached to the device for pressing with an adhesive. It can be prevented. Alternatively, release films may be placed on both sides of the laminated core, or adhesive layers on both sides of the laminated core may be removed and then pressed by a pressurizing device.

The heating step (S420) is a step in which the pressurized laminated core is charged into a heating furnace (not shown) and heated for 120 to 230 seconds at a temperature range of 110 to 210°C. Here, the heating temperature and heating time of the laminated core correspond to an example and may be changed depending on the material of the adhesive layer and the material of the filling resin.

Additionally, the heating furnace may heat the laminated core using an induction heating method or may heat the laminated core using a heater or the like. That is, the heating furnace can be any heating device as long as it can heat the laminated core while satisfying the above conditions.

The cooling step (S430) is a step of cooling the heated laminated core.

For example, in the cooling step (S430), the heated laminated core can be cooled at high speed by spraying air, cooling gas, or cooling water. Alternatively, cooling may be performed within the heating furnace by providing a cooling passage in the heating furnace.

Alternatively, the curing step (S400) according to an embodiment of the present invention can be performed simultaneously with filling the resin in the resin filling device 100 without using a separate pressurizing device, heating device, or cooling device.

That is, the pressing step (S410) may be pressed by the upper mold 200 and the lower mold 400 in the same way as the core pressing step (S320) of pressing the laminated core in the resin filling step (S300).

In addition, the heating step (S420) may heat the laminated core pressurized by a heating device provided in the upper mold 200 and the lower mold 400 to heat the mold.

In addition, the cooling step (S430) can indirectly cool the heated laminated core by cooling the upper mold 200 and the lower mold 400.

Through this, the curing process can be performed continuously after filling the resin in the resin filling device 100 without a separate pressurizing device, heating device, and cooling device, thereby reducing manufacturing costs, and curing after filling the resin. For this purpose, a separate process that requires moving the laminated core can be omitted, which has the effect of reducing manufacturing time.

Through this method of manufacturing a laminated core according to an embodiment of the present invention, the step of heat-curing the adhesive layer in the core mold is omitted, and after completing the resin filling in the laminated core, the laminated core is heated to form the adhesive layer of the lamina member. By curing, the laminated core can be integrated and the filled resin can be cured at the same time, simplifying the manufacturing process and reducing manufacturing time and cost.

Although the present invention has been described in detail through specific examples, this is for detailed explanation of the present invention, and the present invention is not limited thereto, and the present invention is intended to be understood by those skilled in the art within the technical spirit of the present invention. It is clear that modification or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

S: Sheet plate L: Lamina member
C: Laminated core M: Magnet
10: Core mold 13: Slot punch
15: Shaft hole punch 16: Adhesive application part
17: Blanking part 18: Laminated barrel
19: Laminated core transfer unit
100: Resin filling device 110: Base frame
120: carrier tray 200: upper mold
210: Core pressurizing part 300: Center base
310: Base plate 320: Guide part
330: Clamp 400: Lower mold
410: Resin supply unit

Claims (8)

The adhesive is applied while passing through a thin plate with an adhesive layer formed on the surface, and then blanked to sequentially form lamina members of a predetermined shape and laminated. However, the lamina members are laminated without heat-curing the adhesive layer, and the adhesive is used to prepare the adhesive. A laminated core forming step of forming a bonded laminated core;
A magnet insertion step of inserting a magnet into the magnet insertion hole of the laminated core;
A resin filling step of filling the magnet insertion hole of the laminated core into which the magnet is inserted with resin; and
A curing step of heating the resin-filled laminated core to cure the adhesive layer of the lamina member to integrate the laminated core and simultaneously cure the filled resin;
A method of manufacturing a laminated core comprising.
According to paragraph 1,
The laminated core forming step is,
A hole forming step of punching the thin plate to form a common hole;
An adhesive application step of applying adhesive to a portion of the thin plate where no perforation is formed;
A lamina member manufacturing step of sequentially forming a lamina member having a common perforation by blanking the thin plate; and
A lamina member preliminary adhesion step of pre-adhering a plurality of lamina members to form the laminated core by stacking and pressing the lamina members;
A method of manufacturing a laminated core comprising:
According to paragraph 1,
The laminated core forming step is,
A method of manufacturing a laminated core, comprising applying an adhesive that hardens at room temperature, blanking the lamina members to which the adhesive has been applied, and then stacking and pressing them to form a pre-bonded laminated core.
According to paragraph 1,
The curing step is,
A pressurizing step of pressurizing the resin-filled laminated core;
A heating step of heating the pressurized laminated core; and
A cooling step of cooling the heated laminated core;
A method of manufacturing a laminated core comprising:
According to paragraph 4,
The pressurizing step is,
A method of manufacturing a laminated core, characterized in that the laminated core is pressurized at a pressure of 1 to 15 MPa.
According to paragraph 4,
The heating step is,
A method of manufacturing a laminated core, characterized in that heating for 120 to 230 seconds in a temperature range of 110 to 210 ° C.
According to paragraph 1,
The resin filling step is,
A carrier tray seating step of disposing a carrier tray on which the laminated core is seated and a communication hole communicating with the magnet insertion hole is formed between the upper mold and the lower mold;
A core pressing step of pressing the laminated core with the upper mold and the lower mold; and
A resin injection step of injecting resin into the magnet insertion hole through the communication hole with a resin supply unit provided in the lower mold;
A method of manufacturing a laminated core comprising:
In clause 7,
The core pressurization step is,
A method of manufacturing a laminated core, characterized in that the upper side of the laminated core is pressed with the same pressure as a whole.