KR20090029318A

KR20090029318A - Quick heating and quick cooling for mold

Info

Publication number: KR20090029318A
Application number: KR1020070094454A
Authority: KR
Inventors: 김혁중
Original assignee: 김혁중
Priority date: 2007-09-18
Filing date: 2007-09-18
Publication date: 2009-03-23

Abstract

A quick heating and cooling mold is provided to improve the quality of products and reduce the processing time by allowing quick heating and cooling of the cavity. A quick heating and cooling mold comprises cores(3c,4c) in which a cavity provided with the molten resin from a nozzle is formed. The core, which locally heats the face opposite to the cavity, includes a heating core part(20) in which a work coil is wound along a coil groove(11), a high-frequency oscillator which selectively applies induction current to the work coil in order to heat the heating core part, and a cooling channel(43) formed inside the core to circulate coolant inside.

Description

Quick heating and quick cooling mold device {Quick heating and quick cooling for mold}

The present invention relates to a rapid heating and rapid cooling mold apparatus, and more particularly, by using a high frequency induction heating, it is possible to locally switch between rapid heating and rapid cooling in a short time to significantly increase the quality of the molded product and stable passion molding A rapid heating and rapid cooling die apparatus for enabling the composition of conditions.

In general, the injection mold is formed by forming a cavity having the same shape as the shape of the product to be molded by combining the upper and lower plates containing the core with each other, and injecting the molten resin solidified (particles, pellets) into the cavity at high pressure. Mold the product. These injection molds require a variety of molding conditions for molding, of which the temperature of the resin must be set, and then the resin must be set to be injected at the proper injection pressure and speed into the cavity of the mold.

On the other hand, as is well known, even though the plastic molded product is the same molded product in the injection molding process, a weld line such as a clear color difference or a fine line is formed.

For example, the molded product of a thin plate such as a light guide plate or an optical disk used in an LCD panel is determined according to the flow characteristics of the resin. When the flow characteristics of the resin become poor, molten resin is evenly distributed in the cavity of the mold. A time difference occurs in the spreading, which results in partial uneven solidification of the resin filled in the cavity, leading to weld lines and microforming. Such weld lines or unformed products are not only good in appearance but also have a disadvantage in that the strength of the molded product is deteriorated.

In order to minimize the weld line or unformed as described above, it is necessary to improve the factors affecting the resin flow characteristics, wherein the factors affecting the resin flow characteristics are injection pressure, injection speed and low viscosity resin. There is a problem that is difficult to apply or realistically.

In order to solve this problem, a method of installing a heater or directly injecting a flame or high temperature gas has been proposed to improve the flow characteristics by heating the mold above the glass transition temperature to mitigate the solidification of the resin. .

However, the method of installing the heater has a problem that it is very difficult to design and apply uniform heating conditions for the cavity of the mold, and in case of directly injecting the flame or high temperature gas, soot, etc., may cause soot. If there is a problem that causes contamination of the molded article.

In addition, the installation of the heater or the method of spraying the flame or gas not only greatly reduces the productivity due to the relatively long time required for heating and cooling the mold, but also makes it difficult to accurately control and estimate the heat input amount. Precision molded articles, such as optical discs, have disadvantages that are not suitable for molding.

The present invention was created to solve the problems of the prior art as described above, the present invention is to heat the mold locally using a high frequency induction heating in a short time and to enable rapid cooling through the cooling means the mold It is an object of the present invention to provide a rapid heating and rapid cooling mold apparatus capable of improving productivity while improving resin flow characteristics in a cavity of a cavity.

A rapid heating and rapid cooling mold apparatus according to an embodiment of the present invention for achieving the above object, in the mold apparatus having a molding core formed with a cavity for receiving the molten resin from the nozzle, the molding core is the cavity A heat generating core part in which a work coil is wound along a coil groove by locally heating an area corresponding to an opposite surface of the coil, a high frequency oscillator for selectively generating an induction current to the work coil to generate a heat generating core part, and forming It is characterized in that it comprises a cooling channel formed inside the core to circulate the cooling water.

As a preferable feature of the present invention, the heat generating core portion is provided with a heat balance plate made of aluminum or copper-based heat conductive metal material on one side thereof, and the heat balance plate has cooling channels through which cooling water is circulated. .

In another preferred aspect of the present invention, the forming core is provided with a heat balance tube made of aluminum or copper-based thermally conductive metal on one side by a buried or sandwiched structure.

A rapid heating and rapid cooling mold apparatus according to another embodiment of the present invention is a mold apparatus having a molding core having a cavity in which molten resin is supplied from a nozzle, wherein the molding core has an area corresponding to an opposite surface of the cavity. A heating core wound around the work coil, a high frequency oscillator for generating a heating core by selectively applying an induced current to the work coil, and a cooling channel formed inside the forming core to circulate the cooling water. It is characterized by including the configuration.

As a preferable feature of the present invention, the heat generating core is provided with a heat balance plate made of aluminum or copper-based thermally conductive metal on one side thereof.

In another preferred aspect of the present invention, the thermal balance plate has a cooling channel through which cooling water is circulated.

As another preferable feature of the present invention, the forming core is provided with a thermally balanced tube made of aluminum or copper-based thermally conductive metal on one side by a buried or sandwiched structure.

As another preferable feature of the present invention, the heat generating core is provided with at least two or more and wound with one work coil.

In a rapid heating and rapid cooling mold apparatus according to another embodiment of the present invention, in the mold apparatus having a molding core formed with a cavity for receiving the molten resin from the nozzle, the molding core is attached to the opposite side of the cavity A work coil sheet which is locally bent and continuously formed by bending a single coil in a plane by performing local heating on an area corresponding to a cavity, and a high frequency oscillator that generates a heating core by selectively applying an induction current to the work coil sheet. It is formed in the forming core, characterized in that it comprises a cooling channel through which the coolant is circulated.

In a rapid heating and rapid cooling mold apparatus according to another embodiment of the present invention, in the mold apparatus having a molding core formed with a cavity for receiving the molten resin from the nozzle, the molding core is attached to the opposite side of the cavity A coil installation groove which is subjected to local heating for an area corresponding to the cavity to be vortically processed on a plane, and a work coil body that is formed by continuously bending a coil to be inserted into the coil installation groove, and the forming core It is formed in the interior is characterized in that it comprises a cooling channel through which the coolant is circulated.

In one preferred aspect of the present invention, the work coil body is provided with a heat balance plate made of aluminum or copper-based thermal conductive metal on one side thereof, and a cooling channel through which cooling water is circulated is formed in the heat balance plate. .

As a preferable feature of the present invention, the forming core is provided with a thermally balanced tube made of aluminum or copper-based thermally conductive metal on one side by a buried or sandwiched structure.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

The rapid heating and rapid cooling mold apparatus according to the present invention is capable of instantaneous heating of the cavity of the mold by using high frequency induction heating, so that the flow characteristics of the resin can be very good as well as the local surface of the cavity of the mold. Because of the instantaneous heating, the time required for cooling can be greatly shortened compared to the conventional heater, flame or hot gas system.

In addition, through the structure that additionally constitutes a thermally balanced plate made of copper or aluminum-based metal material with excellent heat transfer characteristics, it is possible to provide uniform rapid heating to the cavity portion of the mold and to provide an efficient cooling channel. Through rapid cooling, high quality molded parts can be mass-produced in a short time, providing a very useful effect in the industry.

Hereinafter, with reference to the accompanying drawings illustrating a rapid heating and rapid cooling mold apparatus according to the present invention.

First, it should be noted that like elements or parts in the drawings are denoted by the same reference numerals as much as possible. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted in order not to obscure the subject matter of the present invention.

1 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a first embodiment of the present invention, Figure 2 is an exploded cross-sectional view of the rapid heating and rapid cooling mold apparatus of Figure 1, Figure 3 It is sectional drawing which showed the "AA" line of 2.

As shown in the figure, the mold apparatus 1 is roughly divided into a top plate 3 and a bottom plate 4 in which a molding core 3c.4c is embedded, and these top plate 3 and the bottom plate 4 are optional. It is made to be able to inject molten resin into the forming core (3c.4c) or to take out the molded product is solidified by the injected resin by being molded and separated. Since such a structure is substantially the same as a well-known mold apparatus, detailed description is abbreviate | omitted.

However, in the present invention, rapid heating through induction heating is performed on the cavity (c) formed in the molding core (3c.4c) to improve the flow characteristics of the resin injected into the cavity (c), thereby improving the weld line or fineness. Preventing the molding, and through the configuration of interposing a metal material having excellent heat transfer characteristics and arranging an appropriate cooling channel is characterized in that the rapid cooling is carried out to increase the production yield.

Looking at the configuration of a mold apparatus according to a first embodiment of the present invention with reference to Figures 1 to 3 as follows.

First, as described above, the mold apparatus 1 is composed of an upper die plate 3 and a lower die plate 4, and the upper die plate 3 and the lower die plate 4 are formed in respective forming cores in opposite directions. (3c.4c) is provided, wherein the forming core (3c.4c) is formed of a cavity (c) formed of a space having the same shape as the shape of the product to be molded to be joined to each other, The cavity (c) is configured to receive resin from the nozzle (7) connected to one side of the upper plate (3).

On the other hand, at least any one or both of the forming core (3c.4c) is a work coil 25 along the coil groove 11 so as to perform local heating to the area corresponding to the opposite surface of the cavity (c) The heating core unit 20 is wound around the cooling core 13, and a cooling channel 13 is formed to perform rapid cooling of the cavity c. In addition, in order to increase the efficiency of rapid heating and rapid cooling, a heat balance plate 40 made of copper or aluminum-based metal having excellent heat transfer characteristics is additionally installed.

Hereinafter, the main components according to the first embodiment of the present invention will be described.

The coil groove 11 is processed as a predetermined depth on the opposite side of the cavity (c) in the forming core (4c), it is formed so that the heat generating core portion 20 is provided in the center as shown in the figure.

The coil groove 11 is preferably formed to a depth close to the cavity (c), it may be processed using a known milling machine or the like.

The work coil 25 is a one-turn or multi-turn winding around the heating object, that is, the heating core 20, the temperature of the heating core 20 by the electrical energy converted from the high frequency oscillator 30 to be described later Will raise. The work coil 25 may be a copper tube, and in addition, various known induction coils may be used, and thus detailed description thereof will be omitted.

The heat generating core portion 20 is provided in a tubular shape by the coil groove 11 is formed in the outer peripheral portion, as shown in the drawing, to the current flowing through the work coil 25 wound along the coil groove 11 As a result, heat is generated due to the resistance between the eddy current loss and the hysteresis loss (in the case of the magnetic body). By the heat generated in this way, the forming core with the heat generating core part 20 is locally heated.

On the other hand, the heating core portion 20 may be provided in one or a plurality at a predetermined interval in the forming core, which is appropriate in view of the shape or area of the cavity (c) and the efficiency of the high frequency oscillator 30 to be described later Can be designed.

The high frequency oscillator 30 is an element that selectively applies an induction current to the work coil 25 so that the heat generating core part 20 generates heat by high frequency heating.

Here, the high frequency heating is precisely referred to as high frequency induction heating, and is a metal conductor located in a coil through which an alternating current (high frequency) current flows due to an electromagnetic induction action, that is, the heat generating core part of the present invention. In the reference numeral 20, heat is generated by resistance between eddy current loss and hysteresis loss (in the case of a sexual body). The high frequency oscillator 30 drives a control circuit using an input voltage, and the control circuit obtains a desired output by transferring the interrupted voltage to an inverter transformer (high frequency transformer) by choppering the input power at high frequency. As a device, instantaneous heating of local parts, energy efficiency and equipment cost are economical, the contact electrode is not required, the operation is extremely stable, the frequency of failure is low, and the parts are easily exchanged. Since the high frequency oscillator 30 may use various known high frequency oscillators or a high frequency generating inverter, detailed description thereof will be omitted.

The cooling channel 13 is formed by processing cooling holes to allow cooling water to circulate inside the forming core 4c, but is not illustrated but configured to receive cooling water from the outside. In the cooling channel 13, the coolant is not circulated during the operation of the high frequency oscillator 30. On the contrary, the coolant is circulated in the coolant supply state when the high frequency oscillator 30 is stopped.

Meanwhile, in the present invention, the cooling channel 13 is formed only in the forming core 4c, but the present invention is not limited thereto, and the cooling channel is also provided in the forming core 3c provided in the upper plate 3. It may be formed.

The thermal balance plate 40 is configured to uniformly transfer the heat to the surface of the cavity c when the heating core part 20 is heated, so as to create an optimum condition for the resin flow characteristics in the cavity c. As one side surface of the heat generating core part 20, that is, referring to the drawings, the heat generating core part 20 is attached to the bottom surface side of the heat generating core part 20.

The thermal balance plate 40 is used as a metal material having excellent thermal conductivity, and the present invention proposes the use of a copper or aluminum-based metal material which is economical and easy to process.

Meanwhile, as shown in the drawing, the thermal balance plate 40 is provided with a cooling channel 43 which receives coolant from the outside and circulates therein in the same way as the cooling channel 13 formed in the forming core 4c. In this case, rapid cooling is possible through the cooling channel 43.

That is, the thermal balance plate 40 uniformly transfers the heat to the surface of the cavity c in a short time when the heating core part 20 is heated by the high frequency oscillator 30, so that In addition to allowing the surface temperature to be uniformly heated, the surface temperature of the cavity (c) is uniformly cooled within a short time when cooling with the cooling water.

The thermal balance plate 40 not only makes the temperature environment of the cavity c uniform, but also serves to increase the rapid heating and rapid cooling efficiency.

On the other hand, although not shown, the forming core 4c is provided with a thermally balanced tube of a length member by processing holes or grooves so as not to interfere with the cooling channel 13 to make the overall thermal distribution of the forming core 4c uniform. There will be.

In addition, the nozzle 7 for supplying the molten resin to the cavity (c) may also be configured to generate heat by winding the work coil, which is an induction coil, on the outer circumferential surface thereof.

Referring to the operation of the rapid heating and rapid cooling mold apparatus according to the first embodiment configured as described above are as follows.

The upper plate 3 in a state where the upper plate 3 and the lower plate 4 constituting the mold apparatus 1 are joined together to form a cavity c in which the forming core 3c and the forming core 4c are sealed to each other. Molten resin is injected into the cavity c from the nozzle 7 connected to one side of (3), and the high frequency oscillator 30 is operated.

Subsequently, the work coil 25 receiving the high frequency current from the high frequency oscillator 30 generates the heat generating core portion 20 located at the center thereof, and the forming core 4c having the heat generating core portion 20 integrally formed therein. ) Conducts heat and is heated. Here, since the heat generating core part 20 is provided corresponding to the area of the cavity c of the mold apparatus 1, local heating is performed on the surface of the cavity c.

On the other hand, the heat balance plate 40 provided on one side of the heat generating core portion 20 is provided with a copper or aluminum-based metal material having excellent heat conduction characteristics, so that the whole is uniform by contact with the heat generating core portion 20. Heating as a temperature results in a uniform temperature distribution over the surface of the cavity c.

When the injection of the resin into the cavity (c) is completed, the operation of the high frequency oscillator 30 is stopped and at the same time the cooling channel 13 formed in the molding core and the cooling channel 43 formed in the thermal balance plate 40. When supplying and circulating the cooling water in the cooling), as the molding core is rapidly cooled by the cooling water circulating in the cooling channels 13 and 43, it is possible to increase the solidification rate of the resin.

Therefore, the local heating of the mold apparatus 1, that is, the surface of the cavity c, is instantaneously performed by using the high frequency induction heating, so that the resin flow characteristic in the cavity c is satisfactorily formed and cooled. In this case, rapid cooling may be performed by circulating and supplying cooling water to the cooling channels 13 and 43 formed in the molding core and the thermal balance plate to shorten the resin solidification rate in the cavity c, thereby increasing productivity.

4 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a second embodiment of the present invention, Figure 5 is a view showing the main portion configuration seen from the direction ″ BB ″ of FIG. Figure 4 is a perspective view showing the main portion of the rapid heating and rapid cooling die apparatus of FIG. 7 is a cross-sectional view illustrating another modified embodiment of FIG. 4.

The mold apparatus 1 in this embodiment is composed of an upper die plate 3 and a lower die plate 4 as in the first embodiment described above, and the upper die plate 3 and the lower die plate 4 face each other. Each forming core (3c.4c) is provided in the direction of the direction, wherein the forming core (3c.4c) is a cavity (c) having a space of the same shape as the shape of the product to be molded to be joined to each other Is formed, the cavity (c) at this time is configured to receive the resin from the nozzle (7) connected to one side of the upper plate (3), this configuration is carried out by a known technique, detailed description thereof will be omitted. do.

However, in the mold apparatus 1 according to the present embodiment, at least one or both of the forming cores 3c.4c may perform local heating on an area corresponding to the opposite surface of the cavity c. The heat generating core 21 is attached and configured, and the high frequency oscillator 30 is configured to apply a high frequency current to the work coil 25 wound on the outer circumferential surface of the heat generating core 21. In addition, a cooling channel 13 is formed in the forming cores 3c and 4c to circulate cooling water, and a heat balance plate 40 made of a metal material having excellent thermal conductivity on one side of the heat generating core 21. This attachment is provided.

As shown in the drawing of the heating core 21, a tubular member having a predetermined length so that the work coil 25 can be wound around one rotation or several rotations on an outer circumferential surface thereof, and is manufactured separately so that any one or both of the forming cores It can be mounted on, and as shown in the figure to form a mounting groove (mh) having an area enough to accommodate the cavity (c) on one side of the forming core (4c), that is, the opposite side of the cavity (c) In this mounting groove (mh) it may be provided with a fitting structure or by welding together with the thermal balance plate 40 to be described later.

The heating core 21 has a configuration in which the work coil 25 to be described later is wound by forming a spiral groove on the outer circumferential surface, and may be provided in one or at least two or more according to the size of the heating area. It is preferable to be wound by one work coil 25.

The heat generating core 21 generates heat due to the resistance of the eddy current loss and the hysteresis loss (in the case of a sexual body) by the current flowing through the work coil 25 wound on the outer circumferential surface. By the heat generated in this way, the forming core 4c with the heat generating core 21 is locally heated.

On the other hand, the heating core 21 may be provided in one or a plurality at a predetermined interval on the forming core, as shown in the drawing to be mounted on the thermal balance plate 40 to be described later using a screw member such as a bolt Although not shown or may be provided through welding or fitting structure may be provided. The heat generating core 21 having such a configuration should be considered in size, shape, location, number, etc. in consideration of the shape or area of the cavity c and the efficiency of the high frequency oscillator 30 to be described later.

The work coil 25 is a one-turn or multi-turn winding around the heating object, that is, the heating core part 20, so that the temperature of the heating core 21 is changed by electrical energy converted from the high frequency oscillator 30 to be described later. Raised. The work coil 25 may be a copper tube, and in addition, various known induction coils may be used, and thus detailed description thereof will be omitted.

The high frequency oscillator 30 is an element that selectively applies an induced current to the work coil 25 so that the heat generating core part 20 generates heat by high frequency heating, which is similar to the first embodiment described above.

That is, the high frequency heating is precisely referred to as high frequency induction heating, and is a metal conductor positioned in a coil through which an alternating current (high frequency) current flows due to an electromagnetic induction action, that is, the heat generating core part of the present invention. In the reference numeral 20, heat is generated by resistance between eddy current loss and hysteresis loss (in the case of a sexual body). The high frequency oscillator 30 drives a control circuit using an input voltage, and the control circuit obtains a desired output by transferring the interrupted voltage to an inverter transformer (high frequency transformer) by choppering the input power at high frequency. As a device, instant local heating, energy efficiency and equipment cost are economical, the contact electrode is not required, the operation is extremely stable, the frequency of failure is low, and the parts replacement is easy. Since the high frequency oscillator 30 may use various known high frequency oscillators or a high frequency generating inverter, detailed description thereof will be omitted.

The cooling channel 13 is formed by processing a cooling hole so that the cooling water can be circulated inside the forming core 4c. Although not shown, the cooling channel 13 is configured to receive the cooling water from the outside. In the cooling channel 13, the coolant is not circulated during the operation of the high frequency oscillator 30. On the contrary, the coolant is circulated in the coolant supply state when the high frequency oscillator 30 is stopped.

The thermal balance plate 40 is attached to one side of the heat generating core 21 to conduct heat uniformly to generate heat to stabilize the thermal environment of the cavity c or to form a cooling channel 43 therein. As a component capable of performing uniform cooling by a cooling water circulating in a short time, it is used as a metal material having excellent thermal conductivity, and preferably a copper or aluminum-based metal material which is economical and easy to process.

As shown in the drawing, the thermal balance plate 40 is configured to be provided between the upper surface of the heat generating core 21 and the lower surface of the forming core 4c. It serves as a heat transfer medium in contact with the forming core 4c.

That is, when the heat balance plate 40 receives heat through the heat generating core 21, the heat balance plate 40 is uniformly heated by the inherent characteristics of the heat conductive metal material. As such, since the heat balance plate 40 is uniformly heated, the forming core 4c in contact with one side thereof is also uniformly heated, thereby minimizing a temperature difference on the surface of the cavity c.

Meanwhile, as shown in the drawing, the thermal balance plate 40 has a cooling channel 43 formed by receiving cooling water from the outside and circulating therein in the same manner as the cooling channel 13 formed in the forming core 4c. This enables rapid cooling. At this time, the cavity c is rapidly cooled by the cooling water passing through the cooling channel 43 of the thermal balance plate 40.

That is, the thermal balance plate 40 uniformly transfers the heat to the surface of the cavity c in a short time when the heating core 21 is heated through the high frequency oscillator 30, thereby providing a surface of the cavity c. In addition to allowing the temperature to be uniformly heated, the surface temperature of the cavity (c) is uniformly cooled within a short time when cooling with the cooling water circulating in the cooling channel 43.

On the other hand, as shown in Figure 7, the forming core (4c) is provided with a heat balance tube 45 of the length by processing holes or grooves so as not to interfere with the cooling channel 13, the overall shape of the forming core (4c) Temperature equilibrium can be achieved.

In addition, the present invention exemplifies a structure having the heating core 21, the heat balance plate 40 and the heat balance tube 45 only in the forming core 4c of the lower plate 4, but the present invention is limited thereto. Alternatively, the same may be applied to the forming core 3c.

Referring to the operation of the rapid heating and rapid cooling mold apparatus according to the second embodiment configured as described above are as follows.

The upper plate 3 in a state where the upper plate 3 and the lower plate 4 constituting the mold apparatus 1 are joined together to form a cavity c in which the forming core 3c and the forming core 4c are sealed to each other. When molten resin is injected into the cavity c from the nozzle 7 connected to one side of (3), the mold apparatus 1 operates the high frequency oscillator 30.

Subsequently, the work coil 25 receiving high frequency current from the high frequency oscillator 30 generates heat of the heat generating core 21 located at the center thereof, and the forming core 4c having the heat generating core 21 generates heat. Inverted and heated.

Here, since the heat generating core 21 is installed corresponding to the area of the cavity c of the mold apparatus 1, local heating is performed on the surface of the cavity c.

On the other hand, the heat balance plate 40 provided on one side of the heat generating core 21 is provided with a copper or aluminum-based metal material having excellent thermal conductivity as described above, and thus receives heat from the heat generating core 21. Heating to a uniform temperature as a whole results in a uniform temperature distribution over the surface of the cavity (c).

Subsequently, when the resin is injected into the cavity c, the operation of the high frequency oscillator 30 is stopped and at the same time the cooling channel 13 formed in the forming core 4c and the thermal balance plate 40. Cooling water is supplied and circulated in the formed cooling channel 43. Then, as the molding core is rapidly cooled by the cooling water circulating through the cooling channels 13 and 43, the solidification rate of the resin can be increased, resulting in increased fishability according to the shortening of the solidification time of the molded article.

8 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a third embodiment of the present invention, Figure 9 is a plan view showing an induction heating coil sheet applied to FIG.

The mold apparatus 1 in this embodiment is substantially the same as in the second embodiment described above, and the same reference numerals are given to the same components. However, in the present embodiment, unlike the second embodiment described above, the work coil sheet 22 in the form of a sheet is formed by continuously bending a single work coil to which an induction current is applied to a plane.

The work coil sheet 22 is attached to one side of the forming core 4c, that is, the opposite side on which the cavity c is formed through a screw member or welding, so that the distance from the cavity c can be minimized. It is preferable to form a mounting groove (mh) having an area sufficient to accommodate the cavity (c) on the opposite side of the cavity (c), the one surface is in contact with the mounting groove (mh) Do.

Reference numeral ch indicates a cooling hole formed in the upper plate 3 and the lower plate 4.

Referring to the operation of the rapid heating and rapid cooling mold apparatus according to the third embodiment configured as described above are as follows.

The upper plate 3 in a state where the upper plate 3 and the lower plate 4 constituting the mold apparatus 1 are joined together to form a cavity c in which the forming core 3c and the forming core 4c are sealed to each other. When molten resin is injected into the cavity c from the nozzle 7 connected to one side of (3), the mold apparatus 1 operates the high frequency oscillator 30 to apply a high frequency current to the work coil sheet 22. .

Subsequently, the forming core 4c is locally heated through the surface in contact with the work coil sheet 22, and as a result, heating is performed on the surface of the cavity c as in the above-described embodiments, and thus the cavity ( It is possible to satisfactorily create a flow characteristic environment of the resin injected into c).

Therefore, the local heating of the mold apparatus 1, that is, the surface of the cavity c, is instantaneously performed by using the high frequency induction heating, so that the resin flow characteristic in the cavity c is satisfactorily formed and cooled. In this case, rapid cooling is performed through the cooling holes ch formed in the forming core 4c, the upper plate 3, and the lower plate 4, thereby shortening the resin solidification rate in the cavity c, thereby increasing productivity. .

10 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a fourth embodiment of the present invention, Figure 11 is a perspective view showing the main portion configuration viewed from the "C-C" direction of FIG.

As shown in the figure, the mold apparatus 1 in this embodiment is composed of the upper die plate 3 and the lower die plate 4 as in the first embodiment described above, and the upper die plate 3 and the lower die plate ( 4) is a structure in which the respective forming cores 3c.4c are provided in mutually opposite directions, wherein the forming cores 3c.4c are spaced in the same shape as the shape of the product to be molded to be joined together. The cavity (c) is formed, wherein the cavity (c) is configured to receive the resin from the nozzle (7) connected to one side of the upper plate (3), this configuration is carried out by a known technique The detailed description is omitted.

However, in the mold apparatus 1 according to the present embodiment, at least one or both of the forming cores 3c.4c may perform local heating on an area corresponding to the opposite surface of the cavity c. The heat generating core 21 is attached, and the figure of this invention illustrates the state applied to all the molding cores 3c.4c.

On the other hand, the forming core (3c.4c) is a coil installation groove 14 which is spirally processed in planar shape by local heating of the area corresponding to the cavity (c), on the opposite side of the cavity (c) ), The coil mounting groove 14 is provided with a work coil body 23 having a swirl shape formed by continuously bending a single coil.

Like the above-described embodiments, the work coil body 23 is configured to receive a high frequency current through the high frequency oscillator 30, and the forming cores 3c. 4c also circulate the cooling water in the same manner as the above-described embodiments. The cooling channel 13 is formed to be possible.

That is, the rapid heating and rapid cooling mold apparatus according to the fourth embodiment of the present invention is similar to the configuration of the above-described first embodiment. However, in the present embodiment, unlike the first embodiment described above, the work coil body 23 formed by bending a single induction coil to which an induction current is applied in a planar spiral shape is applied.

In order to mount the work coil body 23 to the forming core 3c.4c, the forming core 3c.4c corresponds so that the work coil body 23 can be fitted to the opposite side of the cavity c. Coil installation groove 14 is formed in such a shape that the work coil body 23 may be fitted into the coil installation groove 14 or may be fixed in position by welding or the like.

Although not shown, the work coil body 23 may be provided with a heat balance plate made of aluminum or copper-based thermally conductive metal material on one side thereof, as in the above-described second embodiment, and inside the heat balance plate. A cooling channel through which coolant is circulated may be formed, and in addition, the forming core may be provided with a buried or fitted structure in which a heat balance tube made of aluminum or copper-based thermally conductive metal is formed at one side.

Referring to the operation of the rapid heating and rapid cooling mold apparatus according to the fourth embodiment configured as described above are as follows.

The upper plate 3 in a state where the upper plate 3 and the lower plate 4 constituting the mold apparatus 1 are joined together to form a cavity c in which the forming core 3c and the forming core 4c are sealed to each other. When molten resin is injected into the cavity c from the nozzle 7 connected to one side of (3), the mold apparatus 1 operates the high frequency oscillator 30 to apply a high frequency current to the work coil body 23. .

Subsequently, the forming core 4c is locally heated through the surface in contact with the work coil sheet 22, and as a result, the resin flows as heating is performed on the surface of the cavity c as in the above-described embodiments. The characteristic environment can be favorably created.

In addition, rapid cooling is achieved by the cooling water circulating in the cooling channel 13 formed in the forming core 3c. 4c.

Therefore, the local heating of the mold apparatus 1, that is, the surface of the cavity c, is instantaneously performed by using the high frequency induction heating, so that the resin flow characteristic in the cavity c is satisfactorily formed and cooled. In this case, rapid cooling may be performed by circulating and supplying cooling water to the cooling channel 13 formed in the molding core 3c. 4c to shorten the resin solidification rate in the cavity c, thereby increasing productivity.

On the other hand, the present invention is not limited to the described embodiments, it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

1 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a first embodiment of the present invention,

Figure 2 is an exploded cross-sectional view of the rapid heating and rapid cooling mold apparatus of Figure 1,

3 is a cross-sectional view taken along the line ″ A-A ″ of FIG. 2,

4 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a second embodiment of the present invention;

FIG. 5 is a view showing a main part configuration viewed from the direction ″ B-B ″ of FIG. 4;

6 is a perspective view showing the main configuration of the rapid heating and rapid cooling mold apparatus of FIG.

7 is a cross-sectional view showing another modified embodiment of FIG.

8 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a third embodiment of the present invention;

9 is a plan view showing an induction heating coil sheet applied to FIG.

10 is a cross-sectional view schematically showing the configuration of a rapid heating and rapid cooling mold apparatus according to a fourth embodiment of the present invention;

FIG. 11 is a perspective view illustrating a main part structure viewed from the direction ″ C-C ″ of FIG. 10;

1: mold apparatus 3: upper plate

3c: forming core 4: lower plate

4c: forming core 7: nozzle

11: coil groove 13: cooling channel

14: coil installation groove 20: heat generating core portion

21: heating core 22: work coil sheet

23: Work coil body 25: Work coil

30: high frequency oscillator 40: thermal balance plate

43: cooling channel c: cavity

mh: mounting groove

Claims

In the mold apparatus provided with the molding core in which the cavity which receives molten resin from a nozzle was formed,

The forming core is a heating core portion is formed by winding the work coil along the coil groove by the local heating to the area corresponding to the opposite surface of the cavity;

A high frequency oscillator for selectively generating a heating core by applying an induced current to the work coil;

A cooling channel formed inside the forming core to circulate cooling water;

Rapid heating and rapid cooling mold apparatus, characterized in that comprises a.

According to claim 1, wherein the heat generating core portion is provided with a heat balance plate made of aluminum or copper-based heat conductive metal material on one side, the heat balance plate is characterized in that the cooling channel through which the cooling water is circulated is formed Rapid heating and rapid cooling mold device.

2. The rapid heating and rapid cooling mold apparatus as claimed in claim 1, wherein the forming core has a heat balancing tube made of aluminum or copper-based thermal conductive metal on one side thereof by a buried or sandwiched structure.

The forming core is a heating core winding the work coil by the local heating to the area corresponding to the opposite surface of the cavity;

A cooling channel formed inside the forming core to circulate cooling water;

The rapid heating and rapid cooling mold apparatus according to claim 4, wherein the heat generating core is provided with a heat balance plate made of aluminum or copper-based thermally conductive metal on one side thereof.

6. The rapid heating and rapid cooling mold apparatus according to claim 5, wherein the thermal balance plate has a cooling channel through which cooling water is circulated.

5. The rapid heating and rapid cooling mold apparatus according to claim 4, wherein the forming core has a heat balance tube made of aluminum or copper-based thermally conductive metal on one side by a buried or sandwiched structure.

The method of claim 4, wherein the heating core is provided with at least two or more rapid heating and rapid cooling mold apparatus, characterized in that wound in one work coil,

The forming core is attached to an opposite surface of the cavity to perform local heating on an area corresponding to the cavity to form a work coil sheet by continuously bending a single coil in a plane;

A high frequency oscillator for generating a heating core by selectively applying an induced current to the work coil sheet;

A cooling channel formed inside the forming core to circulate cooling water;

The forming core is attached to an opposite surface of the cavity to provide local heating for an area corresponding to the cavity, the coil installation groove being vortexed on a plane;

A work coil body which is formed in the coil installation groove and is formed by continuously bending a coil;

A cooling channel formed inside the forming core to circulate cooling water;

Rapid heating and rapid cooling mold apparatus, characterized in that configured to include

The work coil body is provided with a heat balance plate made of aluminum or copper-based thermal conductive metal on one side thereof, and a cooling channel through which the coolant is circulated is formed in the heat balance plate. Rapid heating and rapid cooling mold device.