KR20230071908A - Injection mold with radial sliding structure for encapsulation of insert parts - Google Patents

Abstract

An injection mold with a radial sliding structure for encapsulation of insert parts according to the present invention comprises: an upper mold with a sprue runner supplying a resin placed on the upper side; a lower mold being spaced apart downward from the upper mold and having an ejection pin operably coupled to the inside thereof; a guide rail coupled to move in the vertical direction within the lower mold; and an inner slide core movably coupled to the side of the guide rail in a dovetail manner. According to the present invention, a gap between a stator core and the inner slide core is adjusted by movement in a radial direction of the inner slide core as the guide rail is moved vertically. Accordingly, the insert parts can be inserted easily and the resin can be prevented from leaking.

Description

Injection mold with radial sliding structure for encapsulation of insert parts}

The present invention relates to an injection mold having a radial sliding structure for encapsulation of insert parts. The present invention relates to an injection mold capable of preventing leakage of resin as the slide core is accurately brought into close contact with the stator core by an opening/closing operation of the mold after insertion.

In general, a motor is an essential device as a power source for mechanical devices that perform linear and rotational motion by receiving electrical energy, and provides an operation to manipulate or drive a machine according to an input signal, and is used for vehicles, households, and electronic products. , it is widely used in industrial equipment, etc. Its basic configuration is largely divided into a rotating part and a fixed part. Here, the rotating rotor drives the machine according to the polar repulsive force or attractive force between the magnetic flux by the permanent magnet and the magnetic flux by the current generated in the rotor and the stator, respectively.

The range of application of eco-friendly motor-based actuators to replace existing engine power is expanding, and in particular, the E-turbo system for Hybrid EV is encapsulation with high heat dissipation materials to improve motor efficiency in extreme conditions of 170,000 rpm or more. encapsulation) technology is required, and the market for automotive parts using motors is growing.

The stator core, which is a stator, is fixed by overlapping several thin steel plates, and supports the wound coils with a plurality of slots for winding coils provided therein, and serves as a passage for magnetic force lines coming from the magnetic poles of the rotor, which is a rotor. That is, the stator core is assembled by processing an electrical steel sheet having high hardness through a press process, stacking the processed blanks, and assembling them using an interlocking method or laser welding or bonding method.

Insulation between the stator core and the coil-wound copper wire has been conventionally manufactured by inserting insulating paper one by one per slot, which reduces productivity, but in order to improve this problem, the stator core is directly molded. A technology for forming an insulating film by injection molding after inserting into a film is being developed. However, there is a high risk of safety accidents in handling high-temperature insert parts, and economic losses due to mold damage may be large.

In the case of manufacturing the stator core manufactured in the above way by a conventional insert part injection method, if the tolerance between the mold and the stator core does not match, it is impossible to seat the insert part in the mold, and the mold part may be damaged when forcibly inserted. can

In addition, since the stator core is generally heated to a temperature of 100 degrees or higher to facilitate the flow of resin and then inserted into the mold, there is a high risk of safety accidents for workers when inserting time is delayed or difficult due to dimensional errors due to thermal expansion. And these causes can lead to deterioration of quality and productivity.

In order to solve the above problems, an object of the present invention is to separate the insulation between the stator core and the coil-wound copper wire from the conventional method, and to insert and inject the stator core directly, the stator core as an insert part and the core constituting the mold It is characterized by providing an insert injection mold that can secure the space between the insert parts so that insert parts are easy to insert, and the slide core is in close contact with the stator core, which is an insert part, in conjunction with the mold opening and closing operation, thereby preventing leakage of resin. .

That is, when the stator core, which is an insert part, is inserted into the injection mold having a radial sliding structure according to the present invention, the injection mold manufactured and the manufactured stator core do not match 100% with the drawing, so there is a gap between the injection mold and the stator core, which is an insert part. +-Tolerances inevitably occur. Therefore, by designing and manufacturing a mold with a structure that can be easily assembled even if thermal expansion due to a change in ambient temperature or a slight error due to machining occurs, it secures work convenience and further contributes to productivity improvement. do.

An injection mold having a radial sliding structure for encapsulation of an insert part according to the present invention for achieving the above object includes an upper mold in which a sprue runner for supplying resin is disposed on the upper side; a lower mold in which ejection pins are operably coupled through an inside of the lower mold in a spaced apart state on a lower portion of the upper mold; Guide rails coupled to be movable along the vertical direction within the lower mold; and an inner sliding core movably coupled to the side of the guide rail in a dovetail manner, the lamination core is moved along the radial direction of the inner sliding core according to the up-and-down movement of the guide rail. It is characterized by adjusting the gap between the and the inner sliding core.

The inner slide core is a slide core body that moves while being directly fitted into a dovetail groove formed on a side surface of the guide rail and a distance control on the inner side of the stator core in a state extending in an upper or lower direction from the slide core body. It includes a slide core gap bar that is possibly arranged.

The slide core gap bar extends outwardly from the resin blocking portion disposed adjacent to the center of the stator core on the inside of the slot formed in the stator core and the resin blocking portion to enable encapsulation of the resin supplied to the stator core. and an encapsulation induction unit that does, and through the operation of the inner slide core interlocked with the closing operation of the upper and lower molds and the movement of the guide rail, close contact with the inner surface of the slot of the resin blocking unit and contact with the slot of the encapsulation induction unit. Maintaining the separation distance enables encapsulation of the stator core.

An air vent is formed on a side surface of the slide core gap bar.

It further includes an outer slide core according to the presence or absence of an insulating film disposed on the outer side of the stator core inserted between the upper mold and the lower mold.

The up and down operation of the guide rail is operated in conjunction with the up and down operation of the ejector plate, and as the ejector plate presses or separates a spring or elastic body (rubber, etc.) installed below the ejector plate, a cam connected thereto is operated, and one side of the cam The guide rail can be operated by applying force to the bottom of the guide rail bush.

According to the present invention, all of the objects of the present invention described above can be achieved.

The injection mold having a radial sliding structure for encapsulation of the stator core, which is an insert part according to the present invention, guides the gap between the stator core and the mold core in the process of inserting the stator core into the mold and injecting resin. By properly maintaining the organic relationship between the rail and the slide core, even if there is a slight error in the machining tolerance between the stator core and the mold core, the mold with a structure that can be easily assembled is designed and manufactured to secure work convenience and further contribute to productivity improvement.

The present invention makes it easy to insert the insert part by operating the slide cores disposed inside and outside around the inserted stator core to secure a gap between the stator core and the inside and outside slide cores, and according to the opening and closing of the mold The occurrence of flash is prevented by adjusting the spacing of the slide cores that operate in conjunction with the up and down movement of the guide rails disposed at the center of the inserted stator core.

1 shows an injection mold with an upper parting according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the injection mold according to FIG. 1, showing an overall assembly view of the injection mold having a radial sliding structure for encapsulation of insert parts.
Fig. 3 shows the state of the injection mold according to Fig. 1 from another angle;
Fig. 4 shows the state of the injection mold according to Fig. 1 from another angle;
5 shows a coupling relationship between a guide rail and an inner slide core.
6 shows a coupling method between a guide rail and an inner slide core through a dovetail method.
7 shows that a stator core is inserted into the lower mold in an open state of the injection mold.
FIG. 8 is an enlarged view of part A of FIG. 7 , showing that a gap is generated in area B through outward movement of the outer slide core and the inner slide core, so there is no interference during insert insertion and smooth insertion is possible.
FIG. 9 shows that the slide core is in surface contact with the stator core on area B through the inward movement of the outer slide core and the inner slide core, so that no gap is generated and flash generation is suppressed.
10 shows a cross section in an open state of the injection mold.
11 shows a cross section of the injection mold in a closed state.
12 shows that the insert injection molded product is released from the mold in an open state of the injection mold.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings. An injection mold having a radial sliding structure for encapsulation of an insert part according to the present invention will be described.

1 to 6, the injection mold having a radial sliding structure for encapsulation of the stator core 1, which is an insert part, has a sprue for supplying resin and an upper mold in which a runner 12 is disposed on the upper side (10), the lower mold 20 to which the ejector pins 22 are operably coupled through the inside in a state of being spaced apart on the lower part of the upper mold, respectively movable along the vertical direction in the upper mold and the lower mold The coupled guide rail 30, the inner slide core 40 movably coupled in a dovetail manner on the side of the guide rail, and disposed on the outside of the stator core 1 inserted between the upper mold and the lower mold The stator of the outer slide core 50, the mold guide block 60 formed to enable the movement of the outer slide core 50 and guiding the stator core 1 to be inserted into the inner center, and the outer slide core 50 The core 1 includes a power supply unit 70 that supplies power to enable movement along the center direction.

The guide rail 30 and the inner slide core 40 have a structure disposed on the lower mold 20 . The guide rail and the inner slide core may be disposed only on the lower mold. That is, the lower mold has a guide rail 30, an inner slide core 40, an outer slide core 50, a mold guide block 60 and a power supply unit 70, while the upper mold has a guide formed in the lower mold. It includes a rail pressure bar 14 that functions to press the rail in a downward direction and a sprue runner 12 that supplies resin, and guide rail 30 through the rail pressure bar 14 when the upper and lower molds are molded. By moving backward in the downward direction, adhesion of the inner slide core 40 to the stator core 1 and occurrence of flash are prevented.

Meanwhile, according to another embodiment, the guide rail 30 may have an upper guide rail disposed movably radially on the upper mold 10 and a lower guide rail movably disposed movably radially on the lower mold 20. there is.

The inner slide core 40 is a slide core body 410 that moves while being directly fitted into a dovetail groove formed on a side surface of a guide rail, and the inner side of the stator core in a state extending upward or downward from the slide core body. It includes a slide core gap bar 420 disposed to be able to adjust the distance on the top.

The slide core gap bar 420 includes a resin blocking portion disposed adjacent to the center of the stator core on the inside of a slot formed in the stator core and an encapsulation of resin extending outward from the resin blocking portion and supplied to the stator core. It includes an encapsulation induction unit that enables.

Through the operation of the inner slide core interlocked with the closing operation of the upper and lower molds and the movement of the guide rail, close contact with the inner surface of the slot of the resin blocking part and maintenance of the separation distance from the slot of the encapsulation induction part for the stator core. Enables encapsulation.

It is characterized in that the insulating layer is formed on the stator core by adjusting the gap between the stator core and the inner slide core through left and right movement of the inner slide core according to the up and down operation of the guide rail.

In a state in which the stator core 1 is inserted into the lower mold 20 having the mold guide block 60, the upper mold 10 and the lower mold 20 undergo a mold closing process. In the above mold closing process, the guide rail disposed in the lower mold has a process of being pushed backward along the lower direction from the initial upward forward state. In a guide rail having a shape in which the diameter gradually increases in a downward direction, as the guide rail moves backward in a downward direction, the slide core body connected to the guide rail induces movement in the center direction. That is, the slide core body continues to move toward the center of the stator core as a result of sliding movement in the upper direction of the guide rail having a relatively small diameter.

Accordingly, the slide core clearance bar 420 coupled to the slide core body 410 is brought into close contact with the radially inner side of the slot formed in the stator core. That is, the resin blocking portion formed on the slide core gap bar moves toward the center of the stator core on the inside of the slot formed on the stator core and closes thereto to block the inflow of resin, and at the same time, the encapsulation guide formed on the slide core gap bar is attached to the stator core. By forming a predetermined gap with the formed slot inner surface, it is possible to encapsulate the resin supplied on the slot of the stator core. The inner slide core coupled in a dovetail manner to the guide rail moving in the upper and lower directions within the lower mold has the result of being closely disposed to the stator core.

Through this, fluctuation of the inserted stator core is prevented. In the dovetail method, the inner slide core may be coupled to a dovetail groove formed on a side surface of a guide rail by a fitting method.

As the inner slide core moves toward the stator core as the guide rail moves up and down, a gap between the stator core and the inner slide core can be secured.

When the upper and lower molds are closed, as the guide rails come into contact with the molds and move backwards, the slide core body coupled to the guide rails induces movement in the center direction, so that the inner slide core moves in the center direction and returns to its original position. By being in close contact with the stator core, occurrence of flash is prevented. That is, an object of the resin block forming the slide core gap bar is to move toward the center of the stator core on the inside of the slot formed in the stator core and come into close contact with it and at the same time block the inflow of resin to prevent flash generation.

The outer slide core 50 is arranged to radially move on the mold guide block 60 into which the stator core 1 is inserted, and functions to hold the outside of the inserted stator core.

The outer slide core can be operated using a power supply unit, and is retracted when the mold is opened, thereby facilitating insertion of the stator core, and when the mold is closed, it adheres to the stator core to prevent flashing. The power providing unit may be operably applied using a spring or an inclined pin.

The resin supplied through the sprue runner disposed through the upper mold is supplied onto the stator core while being surrounded by the inner slide core and the outer slide core.

In the upper mold, a plurality of runners and gates are arranged centered on the sprue, which is the first injection pipe for resin supplied from the outside, and each of the plurality of runners and gates is inserted into the lower mold. On the insulating layer of the stator core supplied to The plurality of runners and gates include a plurality of resin supply passages radially arranged with respect to the center of the stator core.

That is, the resin supplied through the sprue, the runner, and the gate flows through a cavity formed through molding between the upper mold and the lower mold to form an insulating layer on the stator core.

On the lower mold, an ejector pin is operably coupled up and down to enable ejection of the molded insert product.

7 to 9, the stator core is inserted into the lower mold with the injection mold open, and then the slide core and the stator core are moved in the radial direction according to the vertical movement of the guide rail. It explains the state of surface contact between the surfaces and shows that flash generation is suppressed through this.

Referring to FIG. 8 , the outer slide core moves in the outer radial direction by the force of the spring constituting the power supply unit 70, and the inner slide core moves in the outer radial direction by the guide rail operation. There is a gap in the area marked B, so there is no interference when inserting the stator core, which is an insert, and it is possible to insert it smoothly.

Referring to FIG. 9 , in a state where the mold is closed, the outer slide core moves in the inner radial direction by the inclined block, and the inner slide core moves in the inner radial direction when the guide rail comes into contact with the upper mold and retreats. Since the slide core in the area marked B is in surface contact with the stator core, no gap is generated, and flash generation can be suppressed.

10 shows a cross section for explaining the operating principle of the guide rail in an open state of the injection mold. Figure 11 shows a cross section for explaining the operating principle of the guide rail in the closed state of the injection mold. FIG. 12 shows a cross-section for explaining the release process of the insert injection-molded product from the mold and the operating principle of the guide rail in an open state of the injection mold.

When the mold is open,

The ejector plate 25 is retracted by the return spring 23, the ejector plate 25 presses the elastic body 27 connected to the rotary cam 26, the cam rotates, and one surface of the rotary cam 26 guides By applying an operating force to the lower surface of the rail bush 32, the guide rail 30 connected to the guide rail bush 32 can move forward by an operating distance.

The inner slide core 40 connected to the guide rail 30 moves in the opening direction by the operation of the guide rail 30 .

The outer slide core 50 escapes from the restraint state of the cavity block 13 constituting the upper mold 10 and moves in the opening direction by the spring force constituting the power supply unit 70 .

When the mold is closed,

As the rail pressure rod 14 forming the center of the cavity block 13 presses the upper surface of the guide rail 30, the guide rail moves backward by the working distance.

The outer slide core 50 comes into contact with the surface of the cavity block 13 and moves by a working distance to come into close contact with the stator core 1.

The inner slide core 40 connected to the guide rail 30 moves by the working distance and comes into close contact with the stator core 1.

By the operation of the guide rail, the guide rail bush 32 connected thereto presses one surface of the rotation cam 26 while moving backward, and the elastic body 27 connected to the rotation cam 26 is compressed by the ejector plate 25. After that, the molded product is completed in a state where the resin is injected.

Looking at the release of insert injection molded products from the mold,

With the mold open, the ejector plate 25 is advanced to eject the insert product.

As the rotating cam 26 is spaced apart from the guide rail bush 32, no external force acts on the guide rail 30. The product is smoothly released by the ejector pin 22 .

After the product is released, the ejector plate 25 returns by the return spring 23 and presses the elastic body 27 connected to the rotation cam 26, and the guide rail connected to the guide rail 30 while the rotation cam 26 rotates Press the bottom of the bush (32). The guide rail 30 advances upward and the inner slide core 40 connected to the guide rail 30 moves in the opening direction. Through this, a gap is generated smoothly when the stator core 1, which is an insert, is inserted smoothly.

In the injection mold having a radial sliding structure for encapsulation of the insert part according to the present invention, in the process of inserting the stator core, which is an insert part, into the mold and injecting resin, the gap between the stator core and the mold core is properly maintained. By designing and manufacturing a mold with a structure that can be easily assembled even if there is a slight error in the machining tolerance, it secures work convenience and further contributes to productivity improvement.

In addition, it is easy to insert the insert part by securing the space between the stator core, which is an insert part, and the slide core constituting the mold, and the slide core adheres to the stator core, which is an insert part, by the up and down movement of the mold, thereby preventing leakage of resin. let it be

Although the present invention has been described through the above examples, the present invention is not limited thereto. The above embodiments may be modified or changed without departing from the spirit and scope of the present invention, and those skilled in the art will recognize that such modifications and changes also belong to the present invention.

1: stator core
10: upper mold
12 : sprue runner
14: rail pressure bar
20: lower mold
22: ejector pin
30: guide rail
40: inner slide core
410: slide core body
420: slide core gap bar
50: outer slide core
60: mold guide block
70: power supply unit

Claims (6)

an upper mold in which a sprue runner supplying resin is disposed on an upper side;
a lower mold to which an ejector pin is operably coupled through an inside of the lower mold in a spaced apart state on a lower portion of the upper mold;
Guide rails coupled to be movable in the vertical direction within the lower mold; and
In a state including an inner slide core coupled to the side of the guide rail to be movable left and right in a dovetail manner,
Radial sliding for encapsulation of insert parts, characterized in that the clearance between the stator core and the inner slide core is adjusted through radial movement of the inner slide core according to the up and down operation of the guide rail. Injection mold with structure.
According to claim 1,
The inner slide core is a slide core body that moves while being directly fitted into a dovetail groove formed on a side surface of the guide rail, and a distance control on the inner side of the stator core in a state extending in an upper or lower direction from the slide core body. An injection mold having a radial sliding structure for encapsulation for an insert part, comprising an possibly arranged slide core gap bar.
According to claim 1,
The slide core gap bar,
Includes a resin blocking portion disposed adjacent to the center of the stator core on the inside of the slot formed in the stator core and an encapsulation guide portion extending outward from the resin blocking portion to enable encapsulation of the resin supplied to the stator core. and
Through the operation of the inner slide core interlocked with the closing operation of the upper and lower molds and the movement of the guide rail, close contact with the inner surface of the slot of the resin blocking part and maintenance of the separation distance from the slot of the encapsulation induction part for the stator core. enabling encapsulation,
An injection mold with a radial sliding structure for encapsulation of insert parts.
According to claim 1,
An injection mold having a radial sliding structure for encapsulation of an insert part, in which an air venting passage is formed on a side surface of the slide core gap bar.
According to claim 1,
Further comprising an outer slide core disposed on the outer side of the stator core inserted between the upper mold and the lower mold.
An injection mold with a radial sliding structure for encapsulation of insert parts.
According to claim 1,
The up and down operation of the guide rail is operated in conjunction with the up and down operation of the ejector plate, and as the ejector plate presses or separates a spring or elastic body (rubber, etc.) installed below the ejector plate, a cam connected thereto is operated, and one side of the cam An injection mold having a radial sliding structure for encapsulation of insert parts, characterized in that it operates by applying force to the bottom of the guide rail bush.

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