KR100599384B1 - Rapid heating and cooling apparatus for molding apparatus - Google Patents

Abstract

The present invention provides a mold in which rapid heating means and cooling means are combined.

Heat is transferred to the cavity surface in the molds 1a and 1b near the cavity C, and the heat pipe 20 exposed at the end is embedded at a predetermined depth.

On the exposed end of the heat pipe 20, the heat generating means 30 and the cooling means 40 placed in contact with the heat pipe 20 when necessary,

It is a rapid heating and cooling mold that is configured to rapidly heat and cool the mold by the heat transfer method due to the selective contact with the heat pipe (20).

Mold, Heat Pipe

Description

Rapid heating and cooling apparatus {Rapid heating and cooling apparatus for molding apparatus}

1A is a cross-sectional view showing a heating and cooling structure of a general mold,

1B is a plan view of the inside of FIG. 1A;

2 is a cross-sectional view showing another conventional example;

3 is a cross-sectional view of the coupled state of FIG.

4 is a detailed cross-sectional view of a state in which the internal mold of FIG. 3 is omitted;

5 is a cross-sectional view of the present invention,

6 is a plan view of the inside of the mold of FIG. 5;

7 is a plan view showing another example of FIG.

8 is a view showing another example of the operating state of the heat pipe seen from the right side of FIG.

9 is a cross-sectional view taken along the line A-A of FIG. 8;

10 is a cross-sectional view taken along line B-B of FIG. 9;

11 is a cross-sectional view taken along the line C-C of FIG.

12 is a cross-sectional view showing another example of the cooling means of the present invention.

Explanation of symbols for the main parts of the drawings

1a, 1b; mold 20; heat pipe 30; heat generating means 31; heat generating base 32; heat generating cover 33; heat pipe coupling hole 40; cooling means 41; cooling base 42; cooling cover 43; refrigerant passage 44; injection pipe 45; discharge pipe 50,50-1,50-2,52,52-1,52-2; cylinder 51,51-1,51-2,53,53-1,53-2; cylinder rod 57,58; cylinder holder 60 ; Insulation layer 61; Thermally conductive layer 70; Frame 71; First rail 72; Second rail

The present invention relates to a mold capable of rapid heating and cooling, wherein a rapid heating and cooling is possible in a manner in which a general heat pipe is embedded in the mold and the end of the heat pipe is exposed to the outside so as to be in contact with the heating and cooling means. It relates to a mold which can be cooled.

In general, rapid heating and cooling molds are required for advanced mold products. This is a situation in which a general mold is supplied with a molten plastic of high temperature and high pressure to a cavity at room temperature, and then cooled to separate the plastic supplied to the cavity to obtain an injection molded product of a desired mold shape. In this case, the mold temperature is room temperature, so even when hot molten plastic is supplied, it is rapidly cooled and the supply pressure must be high, and the surface of the injection mold is not uniform due to the temperature difference between the mold contact area in the cavity and the internal space. This requires post-processing such that it must be separated separately.

To this end, a method of supplying a molten plastic to the cavity while raising the temperature of the mold at a high temperature has been proposed. As shown in FIGS. 1A and 1B, a mold (A) and a mold that are combined and separated from each other with a cavity (C) are provided. On the inner surface of the cavity (C) adjacent part of (B), the high pressure steam heating pipe 12 which is a heating means, and the cooling water pipe 13 which are cooling means are provided, and each of the heating pipes 12 and the cooling water pipe 13 is provided. The end is operated by engaging the valve (V1, V2) from the outside. In this case, the cooling water pipe 13 may allow the refrigerant to pass therethrough.

In this way, in order to heat to a high temperature (water does not exceed 100 degrees, in order to increase to a high temperature, a high pressure (about 20 bar) steam (about 150 degrees Celsius) must be supplied to provide a high temperature, so that In order to prevent the high pressure, a safety device is required, and heat transfer takes a long time, resulting in a problem of low productivity, and a cost increase as the temperature is raised.

To this end, a method of reaching a high temperature of 200 degrees or more by a ignition using a gaseous fuel during rapid heating has been developed within a few seconds, which is a mold (1a, 1b) having a cavity (C) as shown in Figs. The inner ignition means (heating means due to heating) and the cooling means are built in the cavity toward the cavity, and the inner molds 1c and 1d having a thin thickness and forming a cavity C therebetween are placed in the space between the molds. Of course, if necessary, a structure in which the internal molds 1c and 1d are omitted may be used as shown in FIG. 4. The cooling means is configured to insert the cooling water pipe 7 into the mold to cool the cavity C portion of the mold. Examples of the ignition means include a gas fuel supply pipe 3 installed in the molds 1a and 1b and a nozzle-type fine hole 5 connected to the gas fuel supply pipe 3 so that the ignition gas is discharged toward the cavity C. ) And an air supply pipe 4 for supplying the gas fuel supply pipe 3 so that the gas discharged into the micropores 5 through the gas fuel supply pipe 3 is ignited. (8) is a flame film, and (9) is a nozzle of an injection machine. Denoted at 11 is a microstudy to facilitate the discharge of gas.

Therefore, during heating, the ignition means is ignited with each mold 1a and 1b separated as shown in FIG. 2 (for example, gas is supplied through the gas fuel supply pipe 3, and at the same time, air is supplied to the air supply pipe 4). Ignite while supplying the inner mold (1c, 1d) at 200-400 degrees to reach a high temperature (about 150 ~ 200 degrees) in an instant and then supply the molten plastic to the inner mold (1c, 1d) cavity Increasing the heating of the means (the method of stopping may vary, but one method may be to cut off the supply of the gas fuel supply pipe 3 and the air supply pipe 4), and then each mold 1a as shown in FIG. Cooling water is supplied to the cooling water pipe (7), with 1b being abutted toward the inner molds (1c, 1d). Then, the inner mold (1c, 1d) is cooled in an instant to cool the injection filled in the cavity, and separated from them to eject the injection. In this case, the inner molds (1c, 1d) can be made thinner by simply contacting them to cool and at the same time supplying molten plastic in a heated state. This is also possible. Therefore, the inner molds (1c, 1d) are thin, which enables instant heating from 150 to 200 degrees (increased to the heating temperature within a few seconds) and instant cooling (cooling from 50 to 90 degrees within a few seconds), thereby shortening the processing time of the molded injection molding. This provides the effect of rapid increase in productivity.

However, this method is a method of heating by burning the air, so that the internal drag is generated, which produces a high precision product, there is a problem that the production range of the product is limited due to contamination.

The present invention is to solve this problem, an object of the present invention is to provide a rapid heating and cooling mold that does not require high pressure, there is no fear of contamination by implementing the instantaneous heating and cooling means using a heat pipe.

Another object of the present invention is to provide a rapid heating and cooling mold that simplifies the internal structure of the mold by rapidly transferring the heating and cooling heat to the heat pipe in a narrow space by alternately contacting the heating means and the cooling means for supplying the heat pipe. Is to provide.

To this end, the present invention includes a heat pipe having both ends exposed to a mold, and includes heating and cooling means, and rapid heating and rapid cooling to enable rapid heating and rapid cooling by alternately operating heating and cooling means on the heat pipe. Provide a cool mold.

That is, the present invention is a mold in which the rapid heating means and cooling means are combined,

Heat pipes with exposed ends are transferred to the mold space in the mold near the mold space.

On the exposed heat pipe end, heat generating means and cooling means placed in contact with the heat pipe, if necessary,

The purpose of the present invention is to provide a rapid heating and cooling mold that rapidly heats and cools a mold by heat transfer through a heat pipe.

The heat pipe of the present invention has a structure in which a heat composition having high thermal conductivity is incorporated in a tube such as stainless steel, iron, bronze, aluminum, or the like. Examples of the heat composition may include a freon system, water, glycerine, aqueous sodium hydroxide solution, and the like.

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

FIG. 5 is a cross-sectional view of the present invention, FIG. 6 is a plan view of the inside of the mold of FIG. 5, and FIG. 7 is a plan view showing another example of FIG. 6, in the molds 1a and 1b near the cavity C. Heat pipe 20 is heat transfer to the face and the end is exposed,

On the exposed heat pipe 20 ends, heat generating means 30 and cooling means 40 are placed in contact with the heat pipe 20 when necessary, and the mold is rapidly heated and heat-transmitted through the heat pipe 20. It is configured by cooling. A heat conduction layer 61 having a high thermal conductivity such as copper is formed on the cavity facing portion of the cavity 1 in contact with the heat pipe 20 placed in the molds 1a and 1b, and heat transfer is blocked at a contact portion of the heat pipe 20 opposite to the cavity. It is configured to maximize the heat transfer efficiency by forming a heat insulating layer (60).

One end of the heat pipe 20 is coupled to the heat generating means 30, the other end to the cooling means 40, each of the heat generating means 30 and the cooling means 40 can be in contact with the heat pipe 20 Coupling with the cylinder rod (51, 53) of the cylinder (50, 52) which is a push means for pushing.

7 is another embodiment of the present invention, one end of the heat pipe 20, the heat generating means 30 and the cooling means 40, the other end of the heat generating means 30 and the cooling means 40 is also selectively coupled Configure it. Both heat generating means 30 is in contact with the heat pipe 20 in synchronization with each other, both cooling means 40 is followed by the heat pipe 20 when the contact of the heat generating means 30 is separated from the heat pipe 20 In contact with the cooling means 40, both heat generating means 30 and the cooling means 40 are configured to engage with the cylinder rods 51 and 53 of the cylinders 50 and 52 as corresponding push means. Although the heat pipe is shown as a tubular shape in the above, a plate heat pipe may be used.

The heat pipe material used in the present invention may be a conventional heat pipe, or one having a high thermal conductivity so that heat transfer and heat transfer can be instantaneously transferred at the same time. Preferred examples include bronze.

In addition, the heating means 30 in the present invention may include a variety of heating capable of providing a high temperature, such as electrical resistance, the cooling means 40 in the present invention can be implemented using a variety of means, such as cooling water or refrigerant.

FIG. 8 is a side view of a main part showing a control configuration of the heating means in FIG. 7, FIG. 9 is a sectional view taken along line AA of FIG. 8, FIG. 10 is a sectional view taken along line BB of FIG. 9, and FIG. 11 is a sectional view taken along line CC of FIG. 10. In addition, the heat generating means 30 as shown in Figures 8, 10, and 11 to be separated and coupled to the end of the exposed heat pipe 20 up and down, the heat generating cover 32 and the heat generating base 31 It is separated, and has a coupling hole 33 for coupling the heat pipe on the separation surface. The heat generating cover 32 and the heat generating base 31 constituting the heat generating element 30 are coupled to the cylinder rods 51-1 and 51-2, and the upper cylinders corresponding to the cylinder rods 51-1 and 51-2 are formed. 50-1) and the lower cylinder 50-2. Of course, the upper and lower cylinders (50-1, 50-2) are fixed to the cylinder holder (57, 58) for fixing it. The cylinder holders 57 and 58 are fixed to the rear surface of the second rail 72 for guiding vertical movement (Y direction) of the heat generating cover 32 and the heat generating base 31. The heat generating cover 32 and the heat generating base 31 are simply referred to as heat generating means. However, the heat generating cover 32 and the heat generating base 31 are merely illustrated as heat generating cover and heat generating base. It may be.

The cylinder holders 57 and 58 are coupled to the first rail 71 fixed to the frame 70. The second rail 72 and the cylinder holder 57 guided along the first rail 71 are horizontally supported by the cylinder rod 51 fixed to the second rail 72 and the cylinder 50 actuating them. Enable movement (X direction movement).

12 is a view showing an example of a specific configuration of the cooling means of the present invention, the cooling means 40 is the cooling cover 42 and the cooling base to be separated and coupled to the upper and lower ends of the exposed heat pipe (20) Separated by (41), the separation surface has a refrigerant passage 43 for coupling the heat pipe 20 and the refrigerant communicate with each other, the inlet and outlet of the refrigerant passage 43 for the inlet and outlet of the refrigerant inlet 44 And the discharge pipe 45 is combined.

In the present invention configured as described above, as shown in FIG. 5, the cylinder 50 is extended in contact with the end of the heat pipe 20 in a state in which the cavity C is close to each other in the mold 1a and 1b state. Then, the heat through the heat generating means 30 is immediately transferred to the molds 1a and 1b due to the characteristics of the heat pipe 20 (the heat pipe transmits heat up to 400 degrees as described in Korean Patent Registration No. 0191799 due to its characteristics). This can increase the temperature of the inner surface of the cavity (C) of the mold (1a, 1b) rapidly to reduce the moving pressure of the molten plastic is injected to enable the injection and at the same time the cavity temperature of the molten plastic and the mold Similarly, the surface of the molded product after cooling is smoothly molded, and does not require separate post-processing. Thus, injection molding of thin ultra-thin injection moldings of less than one millimeter is possible.

When the molten plastic is supplied to the cavity in such a heating state, the cylinder rod 51 of the cylinder 50 is stretched and then the cylinder rod 53 of the cylinder 52 is extended and the cylinder rod 53 as shown in FIG. 5. The upper surface of the cooling means 40 coupled to the end abuts the heat pipe 20. Then, the heat pipe 20, which has been heated, is cooled to cool the molds 1a and 1b (preferably 50 to 80 degrees). In this case, when the heat generating means 30 is connected to one side of the heat pipe 20 and the cooling means 40 is connected to the other side as shown in FIG. 6, the heat generating means 30 is first brought into contact with the heat pipe 20 (cylinder (50)), and then expand and contract the cylinder (50) to separate the heat generating means (30) from the heat pipe (20), and then extend the cylinder (52). The heat pipe 20 and the cooling means 40 are in contact.

However, as shown in FIG. 7, the mold may be cooled by contacting the heating means 30 at the same time at both ends of the heat pipe 20, and then at the same time at the both ends of the heat pipe 20. In this case, when heat generation and cooling are simultaneously performed at both ends of the heat pipe 20, heat generation and cooling time are shortened, productivity is increased, and control means are increased, and mold space is increased because it requires installation space. Good to do. In addition, the push means such as the cylinder can be seen that can be implemented in various ways, such as the movement by the rack and pinion, the movement by the hydraulic means in addition to the cylinder.

Specifically, the operation of the heat generating means of the present invention can illustrate that the cylinder rod 51 is extended in the dotted state of Figure 7 to achieve a state as shown in FIG. In this case, when extending, the cylinder rod 51 is stretched as shown in FIG. 8 in the stretched state of the upper and lower cylinders 50-1 and 50-2 (the heat generating cover 32 and the heat generating base 31 are opened). The cylinder rods 51-1 and 51-2 of the upper and lower cylinders 50-1 and 50-2 are extended to surround the heat pipe 20 as shown in FIGS. 10 and 11. Then, the heat of the heated heating cover 32 and the heating base 31 is instantaneously cut into the molds 1a and 1b through the heat pipe 20 to heat the mold. After the heating is completed, the upper and lower cylinders 50-1 and 50-2 are first stretched to pull the cylinder rods 51-1 and 51-2, and at the same time, the heating cover 32 and the heating base 31 are opened ( When the cylinder 50 is pulled apart from each other along the second rail 72, and the cylinder rod 51 pulls the second rail 72 back to the position spaced apart from the heat pipe 20 as shown in FIG. Falls.

Subsequently, the cooling means also acts as the operating step of the heat generating means 30. In this case, since the cooling cover 42 and the cooling base 41 are combined with each other to form the refrigerant passage 43 as shown in FIG. Coolant (water or refrigerant gas, etc.) is supplied to the 43 through the injection pipe 44, and discharged through the discharge pipe 45. When the discharge is completed, the upper and lower cylinders (52-1, 52-2) also stretch and pull the cylinder rod (53-1, 53-2), the cooling cover 42 and the cooling base 41 is the second rail ( When the cylinder 52 is stretched and retracted up and down along 72, it is separated from the heat pipe 20 as shown in FIG. 6. While repeating this heating and cooling process, injection molding is continuously performed. In the above description, the cooling means and the heat generating means have been described, respectively. However, the cooling means and the heating means may be installed in one body.

As described above, the present invention uses a heat pipe as a means for rapidly heating and cooling the mold, and the heat pipe selectively heats the heat exposing unit and the cooling unit to the end exposed to the outside of the mold to contact the transfer means to transfer heat. This facilitates mold installation, reduces manufacturing costs, and lowers maintenance costs.

In addition, the present invention allows the heat transfer by simply contacting the heat pipe and the cooling means to the heat pipe so that there is no fear of contamination due to heat transfer, and the working environment is good because the cooling water or the high pressure steam for heating does not pass into the mold. It is economical because there is no risk of mold damage.

In addition, the heat pipe in the mold has a heat insulating layer on the opposite side of the cavity to maximize heat transfer efficiency by allowing heat to be transferred only to the cavity.

Claims (6)

In the mold combining the rapid heating means and the cooling means, Heat is transferred to the cavity surface in the molds 1a and 1b near the cavity C, and the heat pipe 20 exposed at the end is embedded at a predetermined depth. On the exposed end of the heat pipe 20, the heat generating means 30 and the cooling means 40 placed in contact with the heat pipe 20 when necessary, A rapid heating and cooling mold, characterized in that configured to rapidly heat and cool the mold by the heat transfer method due to the selective contact with the heat pipe (20). According to claim 1, wherein one end of the heat pipe 20 is coupled to the heat generating means 30, the other end to the cooling means 40, each of the heat generating means 30 and the cooling means 40 is a heat pipe 20 Rapid heating and cooling mold, characterized in that coupled with the cylinder rod 51 of the cylinder (50) which is a push means for pushing the contact with). The method of claim 1, wherein one end of the heat pipe (20) and the heat generating means 30 and the cooling means 40, and the other end is also to selectively combine the heat generating means 30 and the cooling means 40, both heat generation The means 30 are in contact with the heat pipe 20 in synchronization with each other, both cooling means 40 is in contact with the heat pipe 20 after the contact of the heat generating means 30 is separated, both heat generating means ( 30) and the cooling means 40 is configured to be coupled to the cylinder rod (51, 53) of the cylinder (50, 52) as the push means, rapid heating and cooling mold. The method of claim 1, wherein a heat conductive layer 61, such as copper, is formed on the cavity portion in contact with the heat pipe 20 of the molds 1a and 1b on which the heat pipe 20 is placed, and the heat pipe 20 opposite to the cavity. ) Rapid heating and cooling mold, characterized in that the heat insulating layer 60 to block the transfer of heat to maximize the heat transfer efficiency in the contact portion. According to claim 2 or 3, wherein the heat generating means 30 is separated into a heat generating cover 32 and the heat generating base 31 so as to be separated and coupled to the end of the exposed heat pipe 20 up and down, Rapid heating and cooling mold, characterized in that it has a coupling hole 33 for coupling the heat pipe. According to claim 2 or 3, the cooling means 40 is separated into a cooling cover 42 and the cooling base 41 to enable the separation and coupling of the end of the exposed heat pipe 20 up and down, The heat pipe 20 is coupled to the refrigerant passage 43 has a refrigerant passage through each other, the inlet and outlet of the refrigerant passage 43 is characterized in that the inlet and outlet pipe 44 and the discharge pipe 45 for the inlet and outlet of the refrigerant is combined Rapid heating and cooling molds.

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