KR20200009950A - Press Apparatus with Improved Heating Efficiency - Google Patents

Abstract

The present invention relates to a press apparatus with improved heating efficiency. More specifically, the press apparatus with improved heating efficiency comprises: a mold including an upper plate and a lower plate; a high-frequency heating unit to heat the mold; and a cooling means to cool the mold. The upper plate and the lower plate of the mold are formed in a prescribed uniform thickness. The present invention uniformly manufactures the thickness of the upper plate and the lower plate of the mold in a prescribed size, applies a high frequency to the mold of the prescribed thickness to rapidly heat the mold in a short period of time, and prevents heat loss by heat transfer of an existing mold to shorten heating time of the mold to a forming temperature and maintain the forming temperature for a long period of time, thereby shortening reheating time of the mold to increase work efficiency.

Description

Press Apparatus with Improved Heating Efficiency

The present invention uniformly fabricates the upper and lower plate thickness of the mold to a predetermined size, by applying a high frequency to the mold of a predetermined thickness to enable rapid heating of the mold in a short time, and to prevent heat loss due to heat transfer of the existing mold It is possible to shorten the heating time of the mold and to maintain the molding temperature for a long time to the molding temperature, thereby reducing the reheating time of the mold through a press device with improved heating efficiency that can increase the efficiency of the work.

In general, heating gold such as nonferrous metals, steel sheets, thermosetting composites, and thermoplastic composites not only maintains the temperature of the mold, but also how much the heating time can be shortened to the forming temperature, and how quickly the temperature is formed when reheating. Whether temperature can be raised significantly affects work efficiency, which is an important factor for increasing productivity and economy.

However, the mold used in the related art generally uses a thick rectangular box type mold, a so-called through mold. In other words, the conventional through-molding mold has a thick thickness, which takes a long time to heat the mold to the molding temperature. This means that the heat is transferred to the inside of the mold, that is, the thickness direction of the mold when heating the mold to the molding temperature. This takes a long time, which seems to be proportional to the time it takes to heat the entire bulky mold to raise the overall temperature of the mold to the molding temperature.

Therefore, in the case of the existing through mold, it takes a lot of time to heat the mold to the molding temperature, and in order to use the mold again or to mold a new product, the mold must be heated to the molding temperature by spending a lot of time again. There is a problem that the efficiency is lowered, thereby reducing productivity and economics.

Republic of Korea Utility Model Registration No. 20-0448733 (registered May 4, 2010)

Accordingly, the present invention has been made to improve the conventional problems,

The press apparatus with improved heating efficiency makes the upper and lower plate thicknesses of the mold uniformly to a predetermined size, and enables rapid heating of the mold in a short time by applying a high frequency to the mold having a predetermined thickness, and due to the heat transfer of the existing mold. One object is to shorten the heating time of the mold to the molding temperature by preventing heat loss and to maintain the molding temperature for a long time.

The present invention is provided with a cartridge made of a material larger than the specific heat of the mold and after the heating of the mold and the cartridge, even if the main heat source is blocked, the cartridge acts as an auxiliary heat source to prevent the temperature drop of the mold to provide a new mold Another aim is to shorten the reheat time.

The present invention is provided with a reinforcement mold with a mold in between, and by disposing an insulator between the mold and the reinforcement mold to block the leakage of current during energization heating by the high frequency heating unit, thereby to prevent safety accidents Another purpose.

Press apparatus with improved heating efficiency according to the present invention is a mold consisting of an upper plate and a lower plate; A high frequency heating unit for heating the mold; And cooling means for cooling the mold;

The upper plate and the lower plate of the mold is characterized in that formed in a predetermined uniform thickness.

The thickness of the upper plate and the lower plate of the mold according to the invention is characterized in that it is proportional to the time of reaching the molding temperature of the surface of the mold.

The upper and lower plates of the mold according to the invention is characterized in that it is formed in a uniform thickness along the contour of the molded product.

The upper plate or the lower plate of the mold according to the present invention, or both of them are further provided with a cartridge that is made of a relatively large heat relative to the mold to act as an auxiliary heat source of the mold.

A reinforcement mold is provided between the mold according to the present invention, and an insulator is further provided between the mold and the reinforcement mold.

The press apparatus having improved heating efficiency according to the present invention makes the upper and lower plate thicknesses of the mold uniformly to a predetermined size, and enables rapid heating of the mold in a short time by applying a high frequency to the mold having a predetermined thickness, It prevents heat loss due to heat transfer and shortens the heating time of the mold up to the molding temperature, and increases work efficiency by maintaining the molding temperature for a long time.

The present invention is provided with a cartridge made of a material larger than the specific heat of the mold and after the heating of the mold and the cartridge, even if the main heat source is blocked, the cartridge acts as an auxiliary heat source to prevent the temperature drop of the mold to provide a new mold The reheat time can be shortened and work efficiency can be increased.

In addition, like a conventional mold, the through mold is not only difficult to install the cartridge because the thickness of the mold is thick, and the efficiency of maintaining the temperature of the mold is low, but the present invention provides a uniform and thin thickness of the mold, so that the cartridge is installed. It is easy, and at the same time easy to maintain the temperature of the mold can improve the efficiency of thermal management.

The present invention is provided with a reinforcement mold between the mold, and by placing an insulator between the mold and the reinforcement mold to prevent the leakage of current when the energization heating by the high-frequency heating unit, thereby preventing safety accidents. .

1 is a cross-sectional view showing a press device with improved heating efficiency according to the present invention;
2 is a cross-sectional view showing a cartridge of the press apparatus according to the present invention;
3 is a cross-sectional view showing an insulator of a press apparatus according to the present invention;
Figure 4 is a schematic diagram of the internal heat transfer test of the press apparatus according to the present invention,
5 is a graph showing the test results of FIG. 4;
Figure 6 is a schematic diagram of the comparison test time of molding temperature for each mold thickness according to the present invention,
7 to 9 are graphs showing the test results of FIG. 6.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, the size of the components, the thickness of the line and the like shown in the drawings referred to in describing the present invention may be somewhat exaggerated for ease of understanding. In addition, since terms used in the description of the present invention are defined in consideration of functions in the present invention, they may be changed according to a user, an operator's intention, and a custom. Accordingly, the definition of this term should be based on the contents throughout the specification.

In addition, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the scope of the invention to those skilled in the art. It is provided for complete information.

As shown in FIGS. 1 to 3, the press apparatus having improved heating efficiency according to the present invention includes a mold 10 including an upper plate 11 and a lower plate 13, and a high frequency heating unit 20 for heating the mold. ) And cooling means 30 for cooling the mold.

As shown in FIGS. 1 to 3, the mold 10 according to the present invention includes an upper plate 11 disposed at an upper portion and a lower plate 13 disposed at a lower portion of the upper plate 11. The lower surface of the upper plate 11 of the mold 10 and the upper surface of the lower plate 13 are provided with a molded part in contact with the molded product, and the upper plate 11 and the lower plate 13 of the mold to have a uniform thickness along the contour of the molded product. Is formed. In this case, the lower surface of the upper plate 11 and the upper surface of the lower plate 13, that is, the inner surfaces of the upper plate 11 and the lower plate 13 are referred to as the surfaces of the upper plate 11 and the lower plate 13.

That is, the upper plate 11 and the lower plate 13 of the mold must be formed to have a predetermined thickness and at the same time have a uniform thickness, so that the inside of the upper plate 11 and the lower plate 13, that is, the upper plate 11 and the lower plate 13. The heat transfer in the thickness direction of the can also occur uniformly, through which the molding temperature at the surface of the upper plate 11 and the lower plate 13, that is, the forming portion of the upper plate 11 and the lower plate 13 can be maintained uniformly. Will be. Therefore, it is preferable that the cross-sectional shape of the upper plate 11 and the lower plate 13 is formed along the shape of the molded product, that is, the contour of the molded product, so that the quality of the molded product is maintained well by maintaining uniform heat transition and molding temperature.

As shown in FIGS. 1 to 3, the high frequency heating unit 20 according to the present invention rapidly heats the surfaces of the upper plate 11 and the lower plate 13 of the mold, which uses high frequency heating. To this end, the high frequency heating unit 20 is disposed between one side end or both side ends of the upper plate 11 and the lower plate 13 so as to energize the upper plate 11 and the lower plate 13 of the mold. The surface of the lower plate 13 is heated.

In this case, in this invention, it has a predetermined thickness of the upper board 11 and the lower board 13, and is produced with uniform thickness simultaneously. When the high frequency electric heating is performed by the high frequency heating unit 20 in this state, the surfaces of the upper plate 11 and the lower plate 13 are rapidly heated. However, during high frequency energizing heating, the heat capacity of the mold is changed according to the thickness of the mold. For example, the thicker the mold, the greater the heat capacity of the mold. This is because the thicker the mold, the more heat is transferred to the inside of the mold, so that the mold is heated up to a molding temperature, and the heating time of the thicker mold becomes longer than the thinner mold.

4 to 6, it will be clearly understood. Hereinafter, the test results of FIGS. 4 to 6 will be considered in more detail.

First, Figure 4 is a schematic diagram for the test of the present invention, the CT-BOX is fastened to any one of the upper plate 11 to the lower plate 13 of the mold, and the sensors are attached to the lower surface and the upper surface of the mold, respectively. In this case, the high frequency heating unit 20 is energized to the lower surface of one side of the mold. In addition, in order to confirm that internal heat transfers from the lower surface of the mold to the upper surface, a sensor is attached to the same position on the upper surface and the lower surface of the mold.

5 shows that heat is transferred from the lower surface of the mold (called the surface to the molding part of the mold) to the inside when the mold according to the present invention is heated to a molding temperature. That is, as in the temperature distribution in the upper graph of FIG. 5, current flows mainly along the surface of the mold, and rapidly heats the surface of the mold. However, as time passes in the lower temperature distribution of FIG. It can be seen that the temperature also rises toward the upper surface of the mold. This can be seen that in heating the mold up to the molding temperature during high-frequency energization heating, the heat transition phenomenon inside the mold is a factor influencing the time for raising the mold to the molding temperature.

Assuming the test results of Figure 5 Figure 7 to Figure 9 is a test result of the time it takes to increase the temperature to the molding temperature for each thickness of the mold.

6 is a schematic diagram for the test results of FIGS. 7 to 9.

7 shows the total temperature distribution when the thickness of the mold is 10T, FIG. 8 shows the total temperature distribution when the thickness of the mold is 20T, and FIG. 9 shows the total temperature distribution when the thickness of the mold is 30T. .

In the case of FIG. 7, when the thickness of the mold is 10T, it took about 80 seconds to reach the molding temperature of about 170 ° C. In the case of FIG. 8, when the thickness of the mold is 20T, it takes about 135 seconds to reach the molding temperature of 170 ° C. In the case of FIG. 9, when the mold thickness is 30T, the mold takes about 170 ° C. The time was shown to take about 180 seconds.

That is, as can be seen in the test results of FIGS. 7 to 9, the heating time increases to the same molding temperature according to the thickness of the mold as the thickness of the mold increases. When the thickness becomes thick, the heat is transferred to the inside when the mold is heated, and it takes more time to heat the mold to the molding temperature.

As can be seen from these test results, it is obvious that the heating time to the molding temperature of the mold is proportional to the thickness of the mold.

In contrast, in the case of a conventional mold, a so-called through mold, it takes about 1 hour to 2 hours when the molding temperature is 170 ° C, whereas the thickness of the mold of the present invention, that is, the mold is 10T to 30T. There is a big difference in that it can be heated to the molding temperature within 5 minutes. Therefore, if the thickness of the mold is made thin within a certain range and the uniform thickness as in the present invention, the heating time of the mold can be significantly shortened to the molding temperature, thereby improving work efficiency.

The mold according to the present invention is capable of molding a thermoplastic composite material and a thermosetting composite material.

First, in the case of the thermoplastic composite material, the molded product is cured by cooling for a predetermined time after melting of the material due to the characteristics of the material. In this case, when using the mold according to the present invention, the thermal conductivity is inversely proportional to the thickness of the mold, so that the thinner the thickness, the greater the thermal conductivity. Therefore, the cooling time can also be shortened, so that the working time can be improved by shortening the working time by cooling faster than the case of using a conventional through mold.

Next, in forming a thermosetting composite material, maintaining a constant temperature is particularly important in that the molded product must be continuously heated. That is, the mold proposed by the present invention is more efficient than the basic mold type in that the heating and temperature maintenance of the mold should be minimized due to heat transfer to the inside of the mold. It is possible.

As shown in Figures 1 to 3, the cooling means 30 according to the present invention is to cool the mold evenly by convection air in the air cooling method. In this case, in order to maintain the cooling space 31 as a heat insulating space, the heat insulating member 70 is installed by a distance from the upper plate 11 and the lower plate 13 of the mold, and the heat insulating member 70 and the top plate 11 are installed. The cooling means 30 blows air into the cooling space 31 to the heat insulating space formed between the bottom plate 13 and the lower plate 13 to increase convection. In this case, it is possible to form a separate discharge part in the cooling means 30 to discharge the air after cooling. However, it can be naturally discharged through the gap of the mold, so it can be reflected in the design considering various factors such as the structure and shape of the mold.

As shown in FIG. 2, the upper plate 11 or the lower plate 13 of the mold according to the present invention, or both of them, are made of a material having a relatively large heat relative to the mold, and the cartridge 40 serving as an auxiliary heat source of the mold is provided. It may be further provided.

The cartridge 40 is a kind of auxiliary heater, is formed in the upper plate 11 and / or lower plate 13 of the mold by cutting a plurality of receiving portions through a cutting process, and then inserted into the receiving portion is mounted to the mold, the specific heat is It is preferable to use a large ceramic material or the like. This is because when the specific heat is large, it is advantageous to maintain the temperature for a long time in that the temperature change is small.

In other words, the cartridge 40 of the present invention, after molding the product, if replaced with a new molded product, or resume work after a certain stop, because the cartridge 40 has a constant temperature, the mold is reheated when the mold is reheated The time to reach the molding temperature can be reduced. Therefore, it is possible to improve the work efficiency by reducing the heating time of the mold for forming the product.

In addition, the embedded installation of the cartridge 40 has a problem that the thickness of the mold in the conventional through-flow mold is not easy to structurally install the installation, the temperature maintenance effect is also lowered for reasons such as internal heat transfer. On the other hand, the embedded installation of the cartridge 40 in the mold of the present invention is easy to install after the cutting of the surface of the mold, and easy to install, and also to prevent heat loss by preventing the internal heat transfer of the mold itself. It can be seen that it is effective to maintain the mold temperature.

The cartridge 40 according to the present invention maintains the temperature by continuously supplying a separate power source. In addition, it is possible to use various types of heat sources such as steam as the cartridge 40, thereby increasing the versatility of the device.

In the present invention as shown in Figure 3 is provided with a reinforcement mold 50 at the top and bottom of the mold to assist the mold, this reinforcement mold 50 supports the upper plate 11 and the lower plate 13 of the mold. And a post 51, and an upper reinforcing mold 53 and a lower reinforcing mold 55 for supporting the post 51. The reinforcement mold 50 configured as described above enables a stable mold structure by supporting the mold.

However, in the present invention, since a high frequency is energized to heat the mold, a safety device for blocking the leakage of current is required. That is, when leakage of current from the mold increases the risk of electric shock to the operator, fire due to leakage of current. This is because there is a risk. Therefore, in the present invention, the insulator 60 is disposed between the post 51 of the reinforcement mold 50 supporting the upper plate 11 and the lower plate 13 of the mold and the upper plate 11 and the lower plate 13 to leak current. It is desirable to prevent the safety accidents such as electric shock or fire hazard by blocking them.

In addition, it is natural that the insulator 60 according to the present invention can obtain the same effect by installing the insulator 60 at the lower end of the reinforcement mold 50, that is, the part contacting the ground.

As described above, specific embodiments of the present invention have been described, but the present invention is not limited to the embodiments disclosed in the present specification and the accompanying drawings, and may be variously modified by those skilled in the art without departing from the technical spirit of the present invention. .

10: Mold
11: top plate 13: bottom plate
20: high frequency heating unit
30: cooling means
31: cooling space
40: cartridge
50: reinforcement mold
51: Post 53: upper reinforcement mold
55: lower reinforcement mold
60: insulator
70: heat insulation member

Claims (5)

A mold 10 composed of an upper plate 11 and a lower plate 13;
A high frequency heating unit 20 for energizing heating for heating the mold 10; And
It comprises a; cooling means 30 for cooling the mold 10, including,
The upper plate (11) and the lower plate (13) of the mold (10) is a press apparatus having improved heating efficiency, characterized in that formed in a predetermined uniform thickness.
The method of claim 1,
The thickness of the upper plate 11 and the lower plate 13 of the mold 10 is proportional to the time of reaching the molding temperature on the surface of the mold 10, the heating efficiency improved press apparatus.
The method of claim 1,
The upper plate 11 and the lower plate 13 of the mold 10 is formed with a uniform thickness along the contour of the molded product, the heating efficiency improved press apparatus.
The method of claim 1,
The upper plate 11 or the lower plate 13 of the mold 10, or both of them, is made of a material having a relatively large heat relative to the mold 10, and a cartridge 40 serving as an auxiliary heat source of the mold 10 is further included. Press device with improved heating efficiency characterized in that it is provided.
The method of claim 1,
The reinforcement mold 50 is provided with the mold 10 therebetween,
Press device with improved heating efficiency, characterized in that the insulator (60) is further provided between the mold (10) and the reinforcement mold (50).

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