KR20070115368A - High-frequency induction resin injection apparatus for plastic mold - Google Patents

Abstract

A high-frequency induction melting resin injecting device is provided to minimize induction power loss by forming a spiral groove at a periphery of the injection nozzle and winding an induction coil along the periphery of the injection nozzle. A high-frequency induction melting resin injection device comprises an injection nozzle(10), an induction coil unit(11), and a high-frequency power supply unit. The injection nozzle is mounted at one end of the melting resin injection device and injects the melting resin to a mold. A spiral groove(13) is formed at a periphery of the injection nozzle. The induction coil unit is wound along the spiral groove of the injection nozzle. The high-frequency supply unit supplies high frequency power to the induction coil unit and heats up a runner region(12) of the injection nozzle instantly, by using electromagnetic force of an induction coil.

Description

High Frequency Induction Melt Injection Machine {HIGH-FREQUENCY INDUCTION RESIN INJECTION APPARATUS FOR PLASTIC MOLD}

1 is a cross-sectional view showing a conventional high frequency jet nozzle.

Figure 2a is a schematic cross-sectional view of the spray nozzle of the high frequency induction molten resin injection apparatus according to the present invention.

It is a figure which shows the state which wound the induction coil part in the injection nozzle of FIG. 2A.

2C is a view illustrating a state in which an induction coil part is wound around an injection nozzle according to another exemplary embodiment of the present invention.

3 is a combined state diagram of a non-contact high frequency induction molten resin injection apparatus according to an embodiment of the present invention using the injection nozzle of FIG.

4 is a combined state diagram of a non-contact high frequency induction molten resin injection apparatus according to another embodiment of the present invention using the injection nozzle of FIG.

5 is a schematic plan view showing the magnetic field formation by the high frequency induction plastic mold heating apparatus according to the present invention.

* Explanation of symbols for the main parts of the drawings

100: non-contact high frequency induction molten resin injection apparatus according to the present invention

10: spray nozzle 11: induction coil part

12: spray nozzle runner 13, 17: spiral groove

14: insulating layer 15: coating material

20: injection mold 21: core plate

22: cavity plate 40: manifold

41: manifold runner 42: heating device

The present invention relates to a high frequency induction molten resin injection apparatus, and more specifically, to form a spiral groove or spiral projection integrally on the outer periphery of the injection nozzle for injecting molten resin into the mold, winding a high frequency induction coil along the portion thereof ( By reducing the manufacturing cost and time of the injection nozzle according to the one-piece, as well as to a high frequency induction molten resin injection apparatus that can minimize the loss of induced power.

In general, plastic injection molds for injection molding plastic products are composed of a movable side and a fixed side, and the movable side and the fixed side are configured to form a product while performing mutual coupling and parting operations, and the movable side and the fixed side parts are mutually In the bonded state, the hot molten resin raw material for forming the product is supplied between the movable and fixed cores along the runner, and the supplied molten resin is molded into the product between the cores, and taken out to complete the product. The structure of the runner is a very important passage when molding a product in an injection mold.

On the other hand, in the conventional configuration of the manifold for supplying molten resin to the injection nozzle for opening and closing the gate of the runner, a plurality of injection nozzles having a cylinder with a piston and a runner are installed in the mold plate, and one of them is a molten resin material. And install a manifold having runners for supplying the molten resin and supplying the molten resin to the spray nozzle through the manifold.

In the conventional manifold structure having the above configuration, the rod heater or the buried type is disposed at a predetermined position of the manifold so that the molten resin material passing through the runner of the manifold for supplying the molten resin material can be smoothly supplied. The heating device of the direct contact type such as the cartridge heater and the like and the spray nozzle part are separately provided with the heating device such as the band heater.

However, the heating method by direct heating has a large amount of heat loss and the heating state is different according to the adhesion state, and it takes a relatively long time, and local heating is impossible. There was a problem in that it was not suitable for the heating of the divided area.

In order to solve the above problems, a spray nozzle for rapidly heating only the runner region of the spray nozzle by a non-contact high frequency induction method has been proposed.

That is, as shown in FIG. 1, the injection nozzle 10 'mounted on one end of the molten resin injection machine for injecting molten resin into a mold (not shown) penetrates the center of the nozzle body (not shown in the drawing number). In the case, a runner 12 'for injecting molten resin is formed, and the inner housing 13' and the outer housing 14 'are formed at a predetermined distance from the nozzle body for a certain degree of thermal insulation. In addition, the induction coil part 11 'is formed along the outer circumference of the inner housing 13' so that only the runner region of the injection nozzle can be rapidly heated by the non-contact high frequency induction method.

However, since the injection nozzles 10 'need to be manufactured separately for the inner and outer housings 13' and 14 ', the manufacturing cost and time are increased, and the space between the nozzle body and the housing for thermal insulation is increased. There was a problem that excessive capacity is generated due to induced power loss.

Therefore, the object of the present invention was devised in view of the above problems,

SUMMARY OF THE INVENTION An object of the present invention is to integrally form a spiral groove or spiral protrusion on the outer periphery of an injection nozzle for injecting molten resin into a mold, and to wind the high frequency induction coil and the runner temperature sensor line together along the portion thereof. It is to provide a high-frequency induction molten resin injection apparatus that can reduce the manufacturing cost and time of the injection nozzle according to, as well as minimize the loss of induced power for high-frequency induction.

High frequency induction molten resin injection apparatus according to the present invention for achieving the above object, in the molten resin injection machine for supplying molten resin to the mold, mounted on one end of the molten resin injection machine to inject molten resin into the mold, An injection nozzle in which a spiral groove is formed at an outer circumference thereof, an induction coil part wound along the spiral groove of the injection nozzle, and a high frequency power supply to the induction coil part to supply the high frequency power to the induction coil. And a high frequency power supply for rapidly heating the runner region.

Here, it is preferable that a spiral protrusion is formed on the outer periphery of the injection nozzle instead of the spiral groove so that the induction coil part is wound along the spiral protrusion.

In addition, the spiral groove or the spiral protrusion may be formed in at least one of the front end, the rear end and the central portion of the injection nozzle.

In addition, the spiral groove or the spiral protrusion may be formed in at least one of the front end, the center part, and the rear end of the injection nozzle so that the induction coil part may be intensively wound.

In addition, after coating the ceramic insulating layer along the helical groove or the helical protrusion, it is preferable to wind the induction coil part surrounded by a covering material made of a heat insulating resin material.

In addition, it is preferable to wind a temperature sensor line for sensing the temperature of the runner together with the induction coil unit.

In addition, it is preferable that a plurality of loops are formed in the induction coil part wound along the spiral groove or the spiral protrusion of the injection nozzle.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

Here, the non-contact high frequency induction according to the present invention is more energy-efficient than the conventional facilities using fossil fuels, such as coal, petroleum, and can precisely manage the operation can produce a high-quality homogeneous product, and does not cause pollution, etc. Due to its many advantages, it is widely used in various industrial fields. The principle of the high frequency induction is to generate a high frequency magnetic field by flowing a high frequency current through a donut-shaped coil using an electromagnetic induction action, so that the induced current flows in the heating material in the high frequency magnetic field. This induced current generates losses caused by eddy currents swirling in the object and Joule heat due to hysteresis loss and generates heat in a very short time. The heating using the heat generated in this way is called induction heating, and the use of high frequency current is called high frequency induction heating. Due to the use of high frequency high frequency currents, magnetic flux and eddy currents are concentrated on the surface layer of the heating object due to the skin action and proximity effect of the current, and the heat loss (eddy current loss, hysteresis loss) generated at this time heats the surface layer of the heating object. . With this principle, since the energy can be concentrated rapidly on the required portion of the object to be heated, efficient and rapid heating is possible, which brings about high productivity and high workability.

Figure 2a is a schematic cross-sectional view of the injection nozzle of the high frequency induction molten resin injection apparatus according to the present invention, Figure 2b is a view showing a state in which the induction coil portion wound in the injection nozzle of Figure 2a will be described together for convenience.

As shown, the spray nozzle 10 mounted at one end of the molten resin injection machine for injecting molten resin into the mold 20 (refer to FIG. 3) has a spiral groove 13 formed at an outer circumference thereof and penetrates the center thereof. The runner 12 which inject | pours a molten resin is formed.

Here, as shown in FIG. 2B, the induction coil part 11 is wound along the helical groove 13 of the injection nozzle 10. In more detail, after the insulating layer 14 made of ceramic or the like is coated on the spiral groove 13, the induction coil part surrounded by the covering material 15 made of a heat insulating resin material such as teflon ( 11 is wound along the insulating layer 14 of the helical groove 13. In addition, the temperature sensor line 16 for sensing the temperature of the runner 12 is wound along with the induction coil unit 11.

In the illustrated example, the spiral groove 13 is formed integrally with the injection nozzle 10, but instead of the spiral groove 13 described above, the spiral coil 13 is formed integrally so that the induction coil part 11 is the spiral. It may be formed by winding along the projection.

In this case, the spiral groove 13 may be formed evenly along the outer circumference of the injection nozzle 10, but it is preferable to form the intensive groove in a partial region in consideration of the processing cost of the groove. That is, the helical groove 13 described above is at least one of the front end, the center and the rear end of the injection nozzle 10 from the molten resin injection machine 30 (see FIG. 3) or the manifold 40 (see FIG. 4). It is preferable to concentrate on. In other words, the spiral groove 13 may be concentrated in the front end of the injection nozzle 10, or the spiral groove 13 may be centrally formed in the front and rear ends of the injection nozzle 10. It is also possible to form the helical groove 13 intensively in the center portion of the (10).

In particular, since the overall shape of the injection nozzle 10 is narrowed to the number of the rear end, the heat difference is higher toward the nozzle tip, which is the rear end of the injection nozzle 10 due to the pressure difference, and the front end of the injection nozzle 10 is also Since the molten resin is injected directly from the molten resin injector 30 (see FIG. 3) or the manifold 40 (see FIG. 4), the exothermic temperature is high, but the center portion of the spray nozzle 10 has a The heat generation temperature is lower than the front end or the rear end. Therefore, in the case of intensively forming the helical groove 13 in the center of the injection nozzle 10, there is an advantage that the exothermic temperature can be formed at a constant high over the entire area of the runner 12 of the injection nozzle 10. have.

In addition, as shown in FIG. 2B, a plurality of loops 11-1 are formed in the induction coil part 11 wound along the spiral groove 13 of the injection nozzle 10. As such, the reason for forming the plurality of loops 11-1 in the induction coil part 11 is that the induction coil part (according to the temperature rise due to the rapid heating of the runner 12 of the injection nozzle 10) 11) is also intended to buffer the induction coil portion 11 that is heated in this way as the coil itself is stretched and stretched to become hot.

FIG. 2C is a view illustrating a state in which an induction coil part is wound around an injection nozzle according to another embodiment of the present invention, and as shown in FIG. 2B, the spiral groove 13 is formed large without forming the spiral groove 13 along the line of the induction coil part 11. It is different in one respect.

That is, in order to further reduce the processing cost of the helical groove, the helical groove 17 is formed in at least one of the front end, the center part, and the rear end of the injection nozzle 10, and the helical groove 17 is formed in the larger one The wire of the induction coil unit 11 is wound intensively.

3 is a state diagram of the combined state of the non-contact high-frequency induction molten resin injection device using the injection nozzle of FIG.

As shown in FIG. 3, the non-contact high frequency induction molten resin injection apparatus 100 according to the exemplary embodiment of the present invention is mounted on one end of the molten resin injection machine 30 to apply molten resin to the plastic injection mold 20. The injection nozzle 10 in which the runner 12 and the spiral groove 13 which are injected are formed, and the induction coil part 11 as a non-contact high frequency induction heating apparatus wound around the spiral groove 13 of the injection nozzle 10 are comprised.

The plastic injection molding die 20 has a core plate 21 located on a substantially flat base (not shown), and the core plate 21 has a cavity plate 22 for manufacturing an appearance of a plastic injection molded product. It is intended to be interlocked. Here, although not shown, the plastic injection molding die 20 is composed of a fixed side mold and a movable side mold to be moved and separated at the time of taking out the product. Of course, the present invention is described with a focus on the plastic injection molding (plastic clip, etc.), but the present invention is not limited to this, it can be applied to all injection molding.

In addition, although not shown, a high frequency power supply unit electrically connected to the induction coil unit 11 and supplying high frequency power is further installed, and the molten resin injection machine 30 and the plastic are caused by the electromagnetic force of the induction coil unit 11. The runner 12 region of the injection nozzle 10 connecting the injection molding die 20 can be rapidly heated.

In addition, the induction coil unit 11 as the non-contact high frequency induction heating apparatus according to the present invention has a coil shape wound along the spiral groove 13 of the outer periphery of the injection nozzle 10, and thus the entire runner 12 is induced by an induction high frequency magnetic field. The region is locally heated rapidly and after injection of the molten resin for the plastic product, it can be cooled and solidified immediately to release its inlet (not shown in the figure).

Here, the rapid heating by the induction coil unit 11 is performed before the molten resin of high temperature from the molten resin injector 30 is injected into the plastic injection mold 20 through the runner 12 (approximately 1-). 5 seconds ago; may be changed according to the type of product or the power supply size) to locally heat the runner 12 region to minimize the temperature between the runner 12 and the hot molten resin to flow well By allowing them to go, it is possible to prevent the resin from hardening in the runner 12.

The induction coil unit 11 as the non-contact high frequency induction heating apparatus is electrically connected to a high frequency power supply unit (not shown) that supplies high frequency power (approximately 1 KHz-300 KHz) to control the high frequency power supply. In fact, in the case of local heating using the induction coil unit 11 as a non-contact high frequency induction heating apparatus according to the present invention, if the output of several tens of kw at about several hundred KHz, the heating time is enough and the heating time is also heated at least about 250 degrees in the shortest time. As a result, the solidification for short time heating and release can be easily achieved. In addition, in the non-contact high-frequency induction molten resin injection apparatus 100 according to an embodiment of the present invention, the injection apparatus is simplified by direct injection of the molten resin by the injection nozzle 10 without forming a separate manifold, thereby simplifying the injection apparatus. It is economically inexpensive.

4 is a combined state diagram of a non-contact high frequency induction molten resin injection apparatus according to another embodiment of the present invention using the injection nozzle of FIG.

In the non-contact high frequency induction molten resin injection device shown in Figure 4 is substantially the same except that the molten resin injection machine 30 and the injection nozzle 10 are connected by the manifold 40, hereinafter, in the same configuration The same reference numerals as in FIG. 3 will be described based on the differences.

As shown in FIG. 4, in the non-contact high frequency induction molten resin injection apparatus according to another embodiment of the present invention, a manifold 40 is formed as a resin connector of the molten resin injection machine 30 and the injection nozzle 10. This manifold 40 is preferable when at least two or more nozzles are provided.

The manifold 40 is a high temperature molten resin from the molten resin injection machine 30 during the production of the plastic product is delivered to the injection nozzle 10 through the manifold runner 41 to be molded into the product from the plastic injection mold The molten state is kept in the runner 41 until it is finished. That is, the heating device 42 of the direct heating system is installed outside the manifold 40, and the insulation of the molten resin raw material in the runner 41 is maintained during the injection of high temperature molten resin for continuous production of plastic products. It will only play a role.

Such a direct heat heating structure may be a general rod heater or a cartridge heater, but the present invention does not limit the heating structure.

On the other hand, the injection nozzle 10 for molding by injecting molten resin into the runner gate (not shown in the figure) of the plastic injection mold 20 is required to immediately cool and solidify for release, with the shortest heating time, Unlike the heating device 42 using the direct heating method of the manifold 40 to form the induction coil part 11 as a non-contact high frequency induction heating device wound along the spiral groove 13 of the outer circumference of the injection nozzle 10. It is.

By forming the induction coil part 11 using the non-contact high frequency induction method, the region of the runner 12 of the spray nozzle 10 is rapidly heated locally, and after the injection of the molten resin for the plastic product, the injection hole (Fig. To cool immediately to release and to solidify.

In addition, the injection nozzle 10 and the manifold 40 may be formed in a detachable structure such as a screw fastening method, so that the injection nozzle 10 and the manifold 40 may be formed to conform to various types of manifolds 40, thereby improving the attachment efficiency thereof.

Therefore, by the non-contact high frequency induction molten resin injection apparatus according to another embodiment of the present invention, while the manifold 40 maintains the existing direct heating method, the injection nozzle 10 applies a induction heater by a magnetic field to provide a new concept of hot. By providing a hot runner structure, it is possible to satisfy both economic and quality.

5 is a schematic plan view showing the magnetic field formation by the non-contact high frequency induction plastic mold heating apparatus according to the present invention.

As shown in FIG. 5, a high frequency from a high frequency power supply (not shown) to the induction coil unit 11 as a non-contact high frequency induction heating apparatus wound around a spiral groove or a spiral protrusion integrally formed at the outer periphery of the injection nozzle 10. A magnetic field (not shown in the figure) is generated by energizing the current, and the induced current caused by the magnetic field causes local rapid heating of the runner 12 region of the injection nozzle 10 and injection of molten resin for the plastic product. Afterwards, the inlet (not shown in the figure) is immediately cooled to release, and thus it is possible to repeatedly increase and decrease the temperature in a short time during continuous molding of the product by the actual plastic mold, and to inject the spray nozzle and induction as compared with the conventional method. By eliminating the gap of the coil, the loss of induced power can be minimized.

According to the high frequency induction molten resin injection apparatus according to the present invention configured as described above, the high-frequency induction coil and the runner are formed by forming a spiral groove or spiral protrusion directly on the outer periphery of the injection nozzle for injecting molten resin into the mold. By winding the temperature sensor line together, it is possible to reduce the manufacturing cost and time of the spray nozzle according to the integrated type, and to minimize the loss of induced power for high frequency induction, thereby not requiring excessive capacity.

Although the present invention has been described in detail with reference to preferred embodiments according to the present invention, this is only for illustrating the present invention and is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention. It should be noted that this is possible as well as this is also within the scope of the present invention.

Claims (9)

In the molten resin injection machine which supplies molten resin to a mold, A spray nozzle mounted at one end of the molten resin injection machine to inject molten resin into the mold, and having a spiral groove formed at an outer circumference thereof; An induction coil part wound along the spiral groove of the injection nozzle; A high frequency induction molten resin injection device comprising a high frequency power supply for supplying a high frequency power to the induction coil portion to rapidly heat the runner region of the injection nozzle by the electromagnetic force of the induction coil. The method of claim 1, A spiral projection is formed on the outer periphery of the injection nozzle instead of the spiral groove so that the induction coil part is wound along the spiral projection. The method according to claim 1 or 2, The helical groove or the spiral projection is formed in at least one of the front end, the center and the rear end of the injection nozzle concentrated high frequency induction molten resin injection device, characterized in that. The method according to claim 1 or 2, The helical groove or the spiral projection is formed in at least one of the front end, the center and the rear end of the injection nozzle is large, the induction coil unit is characterized in that the intensive winding of the induction molten resin injection device. The method according to claim 1 or 2, High frequency induction molten resin injection apparatus, characterized in that for winding the temperature sensor line for sensing the temperature of the runner together with the induction coil unit. The method according to claim 1 or 2, High frequency induction molten resin injection apparatus, characterized in that a plurality of loops are formed in the induction coil portion wound along the spiral groove or spiral projection of the injection nozzle. The method according to claim 1 or 2, One end of the molten resin injection machine and the injection nozzle is a high frequency induction molten resin injection apparatus, characterized in that connected by the manifold. The method of claim 7, wherein High frequency induction molten resin injection device characterized in that the heating means for heating the runner therein is further provided on the outside of the manifold. The method of claim 7, wherein The heating means of the manifold is a high frequency induction molten resin injection device, characterized in that the direct contact heating means such as a rod heater or cartridge heater.

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