KR102686251B1 - Appratus for Resin Molding Magnet of Rotor Core - Google Patents

Abstract

The magnet molding device for the rotor core according to the present invention includes an upper mold 11 and a lower mold 12 installed on a fixed frame 13 to move up and down at the bottom of the upper mold 11. In the molding device, the upper mold 11 includes an upper movable plate 115 that moves upward in contact with the lower mold 12 when the lower mold 12 rises, and the upper movable plate (115) A gate jig 100 to which the rotor core 1000 is coupled is seated in the central part of 115), and the lower mold 12 presses the lower surface of the gate jig 100 when the lower mold 12 rises. It includes a runner block 123, wherein a plurality of tablet insertion portions 123A into which a tablet 3000A is inserted are formed in the central portion of the runner block 123, and a channel 123B is formed on the upper surface of the runner block 123. The resin in which the tablet 3000A is formed and melted is injected into the slot of the rotor core 1000 along the channel 123B.

Description

Magnet molding device for rotor core {Appratus for Resin Molding Magnet of Rotor Core}

The present invention relates to a device for fixing a magnet to a rotor core. More specifically, the present invention relates to a magnet molding device for a rotor core that can improve product quality and increase production efficiency by molding and fixing a magnet inserted into a rotor core with resin.

Generally, a motor consists of a rotor and a stator. The rotor is configured to rotate by a changing magnetic field generated by the stator. There are various types of rotors, but a representative example is the rotor for the IPM motor (Interior Permanent Magnet Motor), which has a structure in which multiple magnets are inserted into a rotor core made of thin electrical steel plates.

The rotor for an IPM motor presses a magnet into a slot formed in the rotor core, and since the rotor is a part that rotates at high speed, the magnet may deviate from its original position due to rotation. Therefore, methods of fixing the magnet to the rotor core by using adhesive or molding with resin are widely used.

As a conventional technology for fixing a magnet to the rotor core by resin molding, in Korean Patent Publication No. 10-2008-0092474 and Japanese Patent Publication No. 2010-187535, molten resin is injected into the upper part of the rotor core where the magnet is inserted. A device for molding a magnet into a rotor core with resin is disclosed. According to this prior art, multiple tablets for resin injection must be melted in each slot of the rotor core, and since the gap between each tablet is large, it is difficult to heat the tablets intensively, which reduces production efficiency.

In addition, according to the above-described prior art, the molten resin injected from the top flows down by gravity and surrounds the magnet. However, according to this method, part of the resin molding may be made uneven, which may lead to a decrease in product quality. there is.

Accordingly, the present inventor would like to propose a magnet molding device for the rotor core that can solve the above-mentioned problems by melting the molten resin injected into the rotor core by concentrating tablets and injecting it from the bottom of the rotor core.

The purpose of the present invention is to provide a magnet molding device for a rotor core that can uniformly inject molten resin into the rotor core.

Another object of the present invention is to provide a magnet molding device for a rotor core that increases product production efficiency by intensively inserting a plurality of tablets for injecting molten resin.

The above object and other inherent objects of the present invention can all be easily achieved by the description of the present invention described below.

The magnet molding device for the rotor core according to the present invention includes an upper mold 11 and a lower mold 12 installed on a fixed frame 13 to move up and down at the bottom of the upper mold 11. In the molding device,

The upper mold 11 includes an upper moving plate 115 that moves upward in contact with the lower mold 12 when the lower mold 12 rises,

A gate jig 100 to which the rotor core 1000 is coupled is seated in the center of the upper moving plate 115,

The lower mold 12 includes a runner block 123 that presses the lower surface of the gate jig 100 when the lower mold 12 rises,

A plurality of tablet insertion portions 123A into which the tablet 3000A is inserted are formed in the center of the runner block 123, and a channel 123B is formed on the upper surface of the runner block 123 to allow the tablet 3000A to be inserted. The molten resin is injected into the slot of the rotor core 1000 along the channel 123B.

In the present invention, a pressure plate 114 coupled to a release shaft 113 is installed in the center of the upper fixing plate 111, and the upper surface of the pressure plate 114 is supported by a plurality of buffer members 114A, The lower surface of the pressure plate 114 may be pressed by the upper surface of the rotor core 1000 when the lower mold 12 is at top dead center.

In the present invention, the gate jig 100 consists of a jig plate 101 and a central protrusion 102 protruding upward from the center of the jig plate 101, and the jig plate 101 includes the channel ( A plurality of injection holes 101A may be formed at positions corresponding to 123B).

In the present invention, a plunger 126 is installed at the lower part of the tablet insertion portion 123A, and the plunger 126 is preferably installed on a plunger holder 127 that moves up and down.

In the present invention, the runner block 123 is preferably provided with a plurality of magnet push pins 123C that operate up and down at the position of the channel 123B.

In the present invention, a plurality of ejector pins 123D that operate up and down at the position of the channel 123B may be installed in the runner block 123.

The present invention is a rotor core magnet that improves product quality by uniformly injecting molten resin into the rotor core and increases product production efficiency by intensively inserting a plurality of tablets for injecting molten resin. The effect of the invention is to provide a molding device.

Figure 1 is a perspective view showing a structure in which a magnet is inserted into a rotor core.
Figure 2 is a perspective view showing a rotor core with a magnet fixed with resin molding.
Figure 3 is a schematic front view showing the magnet molding device for the rotor core according to the present invention, showing the lower mold located at the bottom dead center.
Figure 4 is a schematic front view showing a magnet molding device for a rotor core according to the present invention, showing a state in which the lower mold is located at top dead center.
Figure 5 is a plan view showing the gate jig of the magnet molding device for the rotor core according to the present invention.
Figure 6 is a plan view showing a runner block of the magnet molding device for the rotor core according to the present invention.
Hereinafter, the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a perspective view showing the structure in which the magnet 2000 is inserted into the rotor core 1000, and FIG. 2 is a perspective view showing the rotor core 1000 with the magnet 2000 fixed with the resin molding 3000. Referring to FIGS. 1 and 2 together, a magnet 2000 is inserted into the rotor core 1000, and when the area around the magnet 2000 is molded with resin, the molding portion 3000 is formed by forming the magnet 2000 as shown in FIG. 2. It has a shape that surrounds its surroundings.

As shown in FIG. 1, the magnet 2000 is inserted into a set of slots 1100 formed by penetrating vertically through the rotor core 1000. The magnet 2000 is explained as an example of having two shapes, a first magnet 2000A and a second magnet 2000B, but there may be one or three or more types of magnets. The slot set 1100 is shown as a set of eight, but is not necessarily limited thereto. One slot set 1100 is shown as consisting of a first slot 1100A and a second slot 1100B for inserting two types of magnets, but is not necessarily limited thereto, and can be configured to correspond to the types of magnets described above. is formed The first slot 1100A is a pair of slots symmetrical at a certain angle, and the first magnet 2000A is inserted into the first slot 1100A. The second slot 1100B is also a pair of slots symmetrical at a certain angle, and the second magnet 2000B is inserted into the second slot 1100B.

When the magnet 2000 is inserted into the slot 1100, a step occurs at the top and bottom of the magnet and the slot, and the step is filled with molten resin to form the resin molding 3000. Additionally, passages penetrating up and down are formed at both ends of the magnet inserted into the slot, and these parts are also filled with molten resin. The resin is preferably a thermosetting epoxy resin.

Figure 3 is a schematic front view showing the magnet molding device 1 for the rotor core according to the present invention, showing the lower mold 12 located at the bottom dead center. Figure 4 is a schematic front view showing the magnet molding device 1 for the rotor core according to the present invention, showing the lower mold 12 positioned at top dead center.

As shown in Figures 3 and 4, the magnet molding device 1 for the rotor core according to the present invention includes an upper mold 11, a lower mold 12, and a fixed frame 13. The upper mold 11 is installed and fixed to the upper frame 132 of the fixed frame 13. The lower mold 12 is installed on the lower frame 131 side of the fixed frame 13. The lower mold 12 is not fixed but is installed to move upward and downward. FIG. 3 shows a state in which the lower mold 12 is located at the bottom dead center, and FIG. 4 shows a state in which the lower mold 12 is located at the top dead center.

The fixed frame 13 consists of a lower frame 131 and an upper frame 132. The lower frame 131 and the upper frame 132 are installed and fixed to each other by side frames (not shown). The lower mold 12 is configured to move up and down by a guide post (not shown) installed in the vertical direction on the fixed frame 13, and the vertical movement of the lower mold 12 is performed in the same way as the principle on which the press mold operates. do.

When the lower mold 12 shown in FIG. 3 moves upward and is positioned at top dead center, it is positioned as shown in FIG. 4. The upper mold 11 is installed and fixed to the upper frame 132. The upper mold 11 includes an upper fixing plate 111 fixed to the upper frame 132, a plurality of upper guide posts 112 installed and protruding downward from the upper fixing plate 111, and an upper fixing plate 111. A release shaft 113 installed in the center of the release shaft 113 that extends and expands downward, a pressure plate 114 fixed to the bottom of the release shaft 113, and a plurality of buffers to provide elastic force to the upper surface of the pressure plate 114. Includes member 114A.

An upper moving plate 115 is installed on the upper guide post 112 and moves up and down while being guided by the upper guide post 112. The number of upper guide posts 112 is not particularly limited, but it is desirable to install four for accurate guidance. A first upper guide hole 115A is installed in the upper movable plate 115 at a position corresponding to the upper guide post 112, and the upper guide post 112 is inserted into the first upper guide hole 115A to move upward. The plate 115 is coupled so that it can freely move up and down. An upper guide stopper 112A is installed at the lower end of the upper guide post 112 to support the lowermost position of the upper moving plate 115.

The upper guide post 112 is installed so that when the rising lower mold 12 contacts the upper moving plate 115, the upper moving plate 115 is pushed up by the lower mold 12, and the lower mold 12 ) is lowered from top dead center, the upper moving plate 115 descends together with the lower mold 12 until the lower part of the upper moving plate 115 is caught by the guide post stopper 112A. A second upper guide hole 115B is formed in the upper moving plate 115 at a position corresponding to the lower guide post 125 so that the lower guide post 125 can be inserted and guided when the lower mold 20 rises. do.

A central space 115C, which is a space for inserting the runner block 123 installed in the lower mold 12, is formed in the central part of the upper moving plate 115, and a gate jig 100 is formed around the upper part of the central space 115C. ) A step portion 115D is formed for seating the jig plate 101.

The lower mold 12 is installed on the fixed frame 13 to move up and down. The lower mold 12 includes a lower plate 120, a main body 120A installed on the lower plate 120 and installed on various controllers or components, and a base plate 121 installed on the upper part of the main body 120. A lower guide hole 121A is formed in the base plate 121 at a position corresponding to the position of the upper guide post 112. When the lower mold 12 rises, the upper guide post 112 is inserted and guided into the lower guide hole 121A formed in the base plate 121, as shown in FIG. 4. A support block 122 is installed on the top of the base plate 121, and a runner block 123 is installed on the top of the support block 122. Of course, these support blocks 122 and runner blocks 123 may be one member. On one side of the support block 122, a stopper block 124 is installed on the upper part of the base plate 121. The stopper block 124 serves to push up the upper movable plate 115 by having the upper part of the stopper block 124 contact the lower surface of the upper movable plate 115 when the lower mold 12 rises.

The lower guide post 125 is installed to protrude upward from the base plate 121 at a position corresponding to the second upper guide hole 115B of the upper moving plate 115. The lower guide post 125 is guided by being inserted into the second upper guide hole 115B when the lower mold 12 rises.

The runner block 123 melts the solid resin tablet (3000A) so that it can be injected into the slot of the rotor core 1000. When the lower mold 12 rises and is located at top dead center, the runner block 123 The upper surface is in close contact with the lower surface of the jig plate 101. A plurality of tablet insertion portions 123A are formed in the central portion of the runner block 123, which are opened upward and allow the tablet 3000A to be inserted. The number of tablet insertion portions 123A is not particularly limited and may vary depending on the capacity of the tablet or the size of the rotor core, but usually 3 to 4 tablet insertion portions 123A are formed in the central portion of the runner block 123. desirable.

A channel 123B communicating with the periphery of the tablet insertion portion 123A is formed on the upper surface of the runner block 123. The channel 123B is a path through which the liquid resin in which the tablet 3000A is molten flows, and its shape can be referred to as shown in FIG. 6. A plurality of magnet push pins (123C) are installed on the channel (123B) to push up the lower part of the magnet (2000) inserted into the rotor core (1000), and remain in the channel (123B) after injection of the molten resin is completed. A plurality of ejector pins 123D are installed to remove the cured resin (scrap). The magnet push pin 123C serves to push the magnet 2000 inserted into the slot upward to form a step to allow resin to flow into the upper and lower portions of the magnet 2000 and the slot 1100. The magnet push pin (123C) and the ejector pin (123D) operate to move up and down, and operating means such as an actuator, cylinder, or servo motor for this are installed in the main body (120A).

When the lower mold 12 rises and is positioned at top dead center as shown in FIG. 4, the upper surface of the runner block 123 presses the lower surface of the jig plate 101. At this time, the upper surface of the rotor core 1000 seated on the jig plate 101 presses the lower surface of the pressure plate 114, and the upper surface of the rotor core 100 is pressed against the pressure plate 114 by the elastic force of the buffer member 114A. 114), a uniform elastic force is applied to the surface.

At this time, the plunger 126, which is installed at the bottom of the tablet insertion portion 123A and moves up and down, moves upward and inserts the tablet into the tablet insertion portion 123A to melt the tablet 3000A by the heating means 123E. When pushed upward, the tablet (3000A) is melted and the resin flowing into the channel (123B) passes through the plurality of injection holes (101A) formed by penetrating upward and downward through the jig plate (101) and then flows through the magnet along the slot (1100). (2000) is wrapped with resin. When injection of the resin is completed, the plunger 126 descends again.

The plunger 126 is installed in the plunger holder 127, and the plunger holder 127 is installed to move upward and downward. The vertical movement of the plunger holder 127 is operated by a separate driving means (not shown) such as a motor or cylinder installed in the main body 120A. Since the vertical movement of the plunger holder 127 requires precise movement and strong pressure at the same time, it is desirable to apply driving means such as servo motors and gears. In order to set a limit to the lower movement of the plunger 126, a plunger stopper 128 is fixedly installed at the lower part of the plunger holder 127 to prevent the plunger holder 127 from descending below a certain height.

Figure 5 is a plan view showing the gate jig 100 of the magnet molding device 1 for the rotor core according to the present invention. As shown in Figure 5, the gate jig 100 of the present invention includes a jig plate 101, a central protrusion 102 protruding upward at the center of the jig plate 101, and one side of the jig plate 101. It includes a pair of handles 103 formed in .

The rotor core 1000 has a circular hole penetrating up and down in the center, and this part is inserted into the central protrusion 102 of the jig plate 101, so that the rotor core 1000 is seated on the jig plate 101. do. Since the rotor core 1000 or jig plate 101 is processed while heated to a certain temperature, a robot arm (not shown) grips a pair of handles 103 to move the jig plate 101 upward. It is seated on the step portion 115D of the plate 115. In the jig plate 101, a plurality of injection holes 101A penetrating upward and downward are formed at positions corresponding to the channel 123B of the runner block 123, so that molten resin flows into the channel 123B and the slot 1100. make it possible

Figure 6 is a plan view showing the runner block 123 of the magnet molding device 1 for the rotor core according to the present invention. As shown in FIG. 6, the runner block 123 of the present invention has a plurality of tablet insertion portions 123A formed in the central portion. Although the number of tablet insertion units 123A is shown in FIG. 6, it is not limited thereto. Channels 123B formed as grooves on the upper surface of the runner block 123 are formed to communicate with each slot 1100 of the rotor core 1000. In addition, a plurality of magnet push pins 123C and an ejector pin 123D are located in the channel 123B so that they can move up and down.

It should be understood that the description of the invention described above is merely an example for understanding the invention and is not intended to define the scope of the invention. The scope of the present invention is defined by the claims attached below, and any simple modification or change of the present invention within this scope should be construed as falling within the scope of protection of the present invention.

1: Molding device 11: Upper mold
12: lower mold 13: fixed frame
100: gate jig 101: jig plate
101A: injection hole 102: central protrusion
103: handle 111: upper fixing plate
112: upper guide post 112A: upper guide stopper
113: release shaft 114: pressure plate
114A: Buffering member 115: Upper moving plate
115A: first upper guide hole 115B: second upper guide hole
115C: Central space 115D: Step part
120: lower plate 120A: main body
121: Base plate 121A: Lower guide hole
122: support block 123: runner block
123A: Tablet insertion part 123B: Channel
123C: Magnet push pin 123D: Ejector pin
123E: Heating means 124: Stopper block
125: lower guide post 126: plunger
127: Plunger holder 128: Plunger stopper
131: lower frame 132: upper frame
1000: rotor core 1100: slot
2000: Magnet 3000: Molding part
3000A: Tablet

Claims (6)

In a magnet molding device for a rotor core including an upper mold (11) and a lower mold (12) installed on a fixed frame (13) to move up and down below the upper mold (11),
The upper mold 11 includes an upper moving plate 115 that moves upward in contact with the lower mold 12 when the lower mold 12 rises,
A gate jig 100 to which the rotor core 1000 is coupled is seated in the center of the upper moving plate 115,
The lower mold 12 includes a runner block 123 that presses the lower surface of the gate jig 100 when the lower mold 12 rises,
In the center of the runner block 123, a plurality of tablet insertion portions 123A into which the tablet 3000A is inserted are opened upward and formed, and a channel 123B is formed on the upper surface of the runner block 123,
The lower mold 12 is raised and positioned at top dead center, and the upper surface of the runner block 123 is in close contact with the lower surface of the jig plate 101, and the molten resin of the tablet 3000A is transferred to the channel 123B. ) A magnet molding device for a rotor core, characterized in that it is injected into the slot of the rotor core (1000). The method of claim 1, wherein a pressure plate 114 coupled to a release shaft 113 is installed at the center of the upper fixing plate 111 fixed to the upper frame 132 of the upper mold 11, and the pressure plate The upper surface of 114 is supported by a plurality of buffer members 114A, and the lower surface of the pressure plate 114 is pressed by the upper surface of the rotor core 1000 when the lower mold 12 is at top dead center. A magnet molding device for a rotor core, characterized in that. The gate jig according to claim 1, wherein the gate jig 100 includes a jig plate 101 and a central protrusion 102 protruding upward from the center of the jig plate 101, and the jig plate 101 includes the jig plate 101. A magnet molding device for a rotor core, characterized in that a plurality of injection holes (101A) are formed at positions corresponding to the channel (123B). The magnet of the rotor core according to claim 1, wherein a plunger 126 is installed at the lower part of the tablet insertion portion 123A, and the plunger 126 is installed on a plunger holder 127 that moves up and down. Molding device. The magnet molding device of the rotor core according to claim 1, wherein the runner block (123) is provided with a plurality of magnet push pins (123C) that move up and down at the position of the channel (123B). The magnet molding device for a rotor core according to claim 1, wherein the runner block (123) is provided with a plurality of ejector pins (123D) that move up and down at the position of the channel (123B).