KR101307433B1 - Method and Apparatus for Rapidly Heating and Cooling the Mold Apparatus - Google Patents

Abstract

According to the present invention, in the mold for injecting the plastic melt, the heater coupling groove 120 is formed in the mold, and the heat medium inlet 126 is formed at the inlet or the outlet of the heater coupling groove 120. The heat medium outlet 128 is formed at the outlet or the inlet of the heater coupling groove 120. The present invention couples the first check valve 130 to the heat medium inlet 126, couples the second check valve 140 to the heat medium outlet 128, and then connects the first check valve 130 to the first check valve 130. The first pump is connected to supply the high pressure heat medium, while the second check valve 140 is connected to the second pump to supply the high pressure heat medium in the opposite direction to a pressure higher than the pressure of the first pump.
The present invention can simply control the high-temperature, high-pressure heating medium gas automatically within the set pressure range by using two check valves, and thus has the advantage of precisely controlling the temperature of the mold.

Description

Temperature control method and apparatus of injection mold {Method and Apparatus for Rapidly Heating and Cooling the Mold Apparatus}

The present invention relates to a rapid heating and cooling method of an injection mold, and more particularly, can be carried out a rapid heating and cooling process at a high temperature, precisely maintain a set temperature, injection can be carried out uniform temperature control A molding die and a temperature control method thereof.

Today, plastics are molded to produce various types of products. Various mold apparatuses are used for plastic molding. Plastic moldings take advantage of the intrinsic properties of plastics, while plastic materials generally have plasticity or fluidity at high temperatures, while plasticity loses plasticity and fluidity at low temperatures and can maintain morphological fixability at a given shape. Because there is.

The mold apparatus and the method of use which are generally used today are generally performed in the following manner.

A conventional general mold apparatus is schematically shown in FIG. In general, the mold apparatus is designed in the shape of a fixed mold (10) fixed to one side, a movable mold (20) which can be coupled to the fixed mold and movable in the left and right direction, and the final object, the molten plastic It has a cavity 30 that is filled. The cavity 30 is formed between the fixed mold 10 and the movable mold 20 to be coupled. Typically, the mold apparatus is supplied with a plastic material, which is a molding material, from an injection machine, including an injection unit 42 for melting the plastic, which is a molding material, at a high temperature, giving fluidity, and then injecting the plastic into the mold, and fluidity injected from the injection unit. It has a flow runner 44 formed to guide the molding material of the final destination to the cavity (30). The melt of the plastic resin heated and melted at a high temperature in the injection molding machine is guided to the cavity 30 through the injection unit 42 and the flow runner 44, and filled into the cavity 30, and then Is cooled to form a predetermined shape and converted into a plastic molding. Then, the movable mold 20 is separated from the fixed mold 10, and the plastic molding is discharged to the outside.

When manufacturing a plastic molded part using a mold apparatus, the most important technical factor is the temperature distribution of the surface of the cavity 30 which fills the molten plastic resin raw material and forms the final shape. The temperature of the surface of the cavity 30 should not only be uniform throughout the entire area, but it is important to be uniformly heated and cooled even in the heating and cooling processes. In particular, the surface temperature of the cavity 30 when manufacturing a plastic molded article of a 50-inch or larger front of a television, or a double injection to sequentially inject two kinds of plastic raw materials as it is today If the distribution is different, it is virtually impossible to produce high quality products.

In this regard, the technique of uniformly forming or maintaining the temperature of the surface of the cavity 30 uniformly and the technique of rapidly forming and rapidly cooling the temperature of the cavity 30 inside the mold to shorten the molding cycle are productive. It is a very important requirement in terms of improvement.

In this regard, a method of externally heating only the surface of the cavity 30 has been introduced. This method is a method of processing a plurality of holes capable of supplying a high temperature heat medium to the adjacent area of the cavity of the stationary mold 10, and supplying high-temperature, high-pressure steam to the inside of the hole to heat it. However, this method has to provide a separate heating means in addition to the mold, the equipment is complicated, there is a disadvantage that the efficiency is not good.

In order to improve this disadvantage, a method of forming a predetermined flow path inside the mold and mounting the heater cartridge inside the flow path has been developed and introduced in Korea. The most representative way can illustrate the Republic of Korea Patent Publication No. 2007-76211 "molding mold system having a heating element".

Moreover, the method of forming a predetermined | prescribed flow path in the inside of a metal mold | die, and inserting a heater cartridge in the inside of this flow path and heating a metal mold | die is also introduced. As a representative example, the Republic of Korea Patent Registration No. 975014 "Quick heating / cooling apparatus of injection mold and its mold temperature control method" can be exemplified. This method forms a predetermined flow path inside the mold, embeds a heater cartridge in the flow path, injects water into the flow path as a heat transfer medium, heats the heater cartridge, and heats the heater cartridge. By converting water into hot water or steam, the cavity of the mold is heated, and then the coolant is introduced through the inlet at the front of the flow path, and the coolant is quickly discharged to the outlet. This method is a relatively improved method in that a heater cartridge is mounted inside the mold without additional heating means to raise / cool the surface temperature of the cavity.

However, this method still has a fatal disadvantage that has not been solved. In this method, although the arrangement relationship between the cavity, the flow path, and the heater cartridge mounted therein is a very important factor, it has been confirmed that there is no specific explanation on this. In the patent specification relating to this method, the flow path and the heater cartridge are actually arranged parallel to the longitudinal direction on one side and at right angles to the longitudinal direction on the other side. Difficult to expect temperature distribution. This means that when a plurality of heater cartridges are arranged, not only the heat supply varies depending on the arrangement interval, but also the heat supply of the heater cartridge and the end of the heater cartridge is different from each other, and an empty space between the heater cartridge and the heater cartridge. Since there is no calorie supplied directly, only calorie delivered from an adjacent portion thereof, the calorie distribution actually supplied to the cavity can be partially changed, so that the surface of the cavity has a uniform temperature distribution. Because it does not come true.

In addition, in the conventional heating method of the mold, since the high temperature and high pressure gas (water vapor) inside the mold is used, if the valve device coupled to the outside of the mold is not controlled by a high precision sensor, the mold is opened due to instantaneous valve opening. The gas inside the high temperature and high pressure is quickly discharged to the outside, and as a result, the temperature inside the mold is drastically lowered, such that the temperature control of the mold cannot be precisely performed.

Republic of Korea Patent Publication No. 2007-76211 "Forming mold system having a heating element; Republic of Korea Patent No.975014 "Quick heating / cooling device of injection mold and mold temperature control method".

The present inventors are to improve the disadvantages of the prior art, while using a high temperature and high pressure heat medium gas inside the mold, it is possible to quickly heat the inside of the mold and uniformly high temperature by the high temperature high pressure heat medium gas An object of the present invention is to provide a mold for molding and a temperature control method thereof.

According to the present invention, even in a process in which the stationary mold and the movable mold are operated vertically, the temperature of the heater coupling groove inside the mold can be rapidly increased, and at the same time, the temperature of the cavity can be maintained uniformly. An object of the present invention is to provide a mold for injection molding and a temperature control method thereof, which can uniformly form the same.

The present invention comprehensively considers the gas flow characteristics formed inside the mold, the heater cartridge mounted therein, and the gaseous characteristics of the heat medium generated thereby, and checks the gaseous properties of the heat medium efficiently and automatically. By organically combining the valve and the heat medium supply pump, the present invention has been completed.

The present invention is a mold for injecting a plastic melt, the heater coupling groove which is formed inside the mold and can be mounted to the heater cartridge for supplying heat to the cavity, and is formed in the inlet or outlet of the heater coupling groove A mold body including a heat medium inlet for supplying a heat medium from the outside to the inside of the mold, and a heat medium outlet formed at an outlet or inlet of the heater coupling groove and for discharging the heat medium from the inside of the mold to the outside; A first check valve coupled to the heat medium inlet and flowing the heat medium only from the outside into the heater coupling groove; A second check valve coupled to the heat medium outlet and allowing the heat medium to flow outwardly only from the heater coupling groove; .

The mold apparatus according to the present invention is connected to the first check valve and connected to the first pump and the second check valve for supplying a heat medium or cooling water at a high pressure from the outside, and to the second check valve. It is preferable to include the 2nd pump which applies a high pressure.

The present invention also relates to a temperature control method of an injection mold, comprising: a heat medium filling step of supplying a heat medium into the heater coupling groove to fill a high pressure heat medium therein; Heating the heater cartridge to convert the heat medium filled in the heater coupling groove into high temperature and high pressure, and to heat the heat medium to maintain a predetermined mold temperature; A heat medium discharge step of rapidly discharging the high temperature and high pressure heat medium existing inside the heater coupling groove to the outside, and rapidly lowering the temperature of the mold by inputting cooling water from the outside; .

The present invention can maintain the heating medium of a high temperature and high pressure existing in the mold at a constant level in the injection mold apparatus that is enlarged, there is an advantage that can maintain a very uniform heating temperature of the mold.

The present invention is provided with a first check valve and a second check valve to allow the heat medium to proceed only in a predetermined direction in the injection mold, so that the second check valve is microscopically instantaneously opened only by gas pressure of high temperature and high pressure therein. Thereby, there is an advantage that can precisely control the temperature inside the mold.

In addition, the present invention simply uses a pair of check valves, and can not use a complicated and expensive precision control valve, it is easy to install the mold apparatus, there is an advantage that can be installed at low cost.

In addition, the present invention is to simply combine the two check valve in the mold body, there is an advantage that can automatically control the temperature inside the mold without adopting an electronic control method.

1 is a conceptual diagram showing a main part of a mold apparatus 100 according to the present invention,
Figure 2 illustrates a first preferred embodiment of a mold body 110 corresponding to the main part of the present invention,
Figure 3 illustrates a second preferred embodiment of the mold body 110 corresponding to the main part of the present invention,
Figure 4 illustrates another preferred third embodiment of the mold body 110 corresponding to the main part of the present invention,
5A is a partial perspective cross-sectional view of the main part of the mold body 110 of the third preferred embodiment of the present invention,
5B is a cross-sectional view illustrating a coupling relationship between the auxiliary heater coupling groove 124 and the heat medium inlet 126 of the mold body 110 of the third preferred embodiment of the present invention.
Figure 5c is a conceptual diagram showing the coupling relationship between the main parts of the mold body 110 of the third preferred embodiment of the present invention,
6 is a schematic view showing a method of using the mold apparatus 100 according to the present invention,
7 is a schematic view of a conventional mold apparatus.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only intended to describe the technical spirit of the present invention in more detail, and the technical spirit of the present invention is not limited thereto.

1 is a conceptual diagram showing a main part of a mold apparatus 100 according to the present invention.

The present invention includes a mold body 110 used to inject a plastic melt. The mold body 110 may be used as the body of the stationary mold 10 or the movable mold 20 constituting the mold apparatus.

In the present invention, the mold body 110 is formed inside the mold and includes a heater coupling groove 120 to which the heater cartridge 123 may be mounted to supply heat to the cavity 30. .

The heater coupling groove 120 is formed as a cylindrical hole in the body of the mold, the heater cartridge 123 is mounted therein. When the heater cartridge 123 is mounted in the heater coupling groove 120, a slight gap is formed between the outer surface of the heater cartridge 123 and the inner wall surface of the heater coupling groove 120. When the heat medium flows, the gap acts as a heat medium flow path, but when the heat medium is filled, the gap serves as a storage container of the heat medium. The heater cartridge 123 is a component for generating heat by supplying electrical energy from the outside, and since it is conventional in the art, detailed description thereof will be omitted.

The heater coupling groove 120 may vary in the number formed in the mold body according to the product to be molded. Although only one heater coupling groove 120 is illustrated in FIG. 1, two or more heater coupling grooves 120 may be formed. The heater coupling groove 120 may be arranged in various forms, in particular, depending on the shape of the cavity 30. In addition, the heater coupling groove 120 may be formed by dividing into a plurality of the main heater coupling groove 122 and the auxiliary heater coupling groove 124 attached thereto in order to supply uniform heat to the cavity 30. . More details are described below.

In the present invention, the mold body 110 is formed at the inlet or outlet of the heater coupling groove 120 and includes a heat medium inlet 126 that can supply the heat medium from the outside to the inside of the mold.

The heat medium inlet 126 is present to supply the heat medium in the mold body 110. The heater coupling groove 120 is formed in the mold body 110, and the heat medium inlet 126 is formed in the inlet or outlet direction of the heater coupling groove 120. The inlet direction of the heater coupling groove 120 refers to a direction in which the head of the heater cartridge 123 exists as a direction in which the heater cartridge 123 is mounted, and an outlet of the heater coupling groove 120. The direction refers to a direction in which an end of the heater cartridge 123 exists as an opposite direction in which the heater cartridge 123 is mounted. 1 illustrates a case in which the heat medium inlet 126 is formed in the inlet direction of the heater coupling groove 120. The heat medium is a medium that receives the heat generated in the heater cartridge 123 and transfers the heat back to the mold body, which means liquid water, oil, steam, and the like. Usually, said heat medium uses liquid water, and may be used as cooling water at the time of cooling.

Since the heat medium inlet 126 may be formed in the inlet or outlet direction of the heater coupling groove 120, while forming a constant coupling relationship with the heater coupling groove 120, the installation positions thereof are independent of each other. It can be seen. Rather, the heat medium inlet 126 is determined in direct relation with the installation direction of the check valve described later.

In the present invention, the mold body 110 is formed at the outlet or inlet of the heater coupling groove 120 and includes a heat medium outlet 128 that can discharge the heat medium from the inside of the mold to the outside.

The heat medium outlet 128 is present to discharge the heat medium from the inside of the mold body 110 to the outside. The heater coupling groove 120 is formed in the mold body 110, and the heat medium outlet 128 is formed in the outlet direction or the inlet direction of the heater coupling groove 120. The heat medium inlet 126 and the heat medium outlet 128 are formed on the opposite sides with respect to the heater coupling groove 120. 1 illustrates a case in which the heat medium outlet 128 is formed in the outlet direction of the heater coupling groove 120.

In the present invention, the mold body 110 includes a first check valve 130 is coupled to the heat medium inlet 126.

The first check valve 130 is a valve to allow the fluid to flow only in one direction when coupled to the plumbing equipment, the heat medium inlet 126 to flow the heat medium only into the heater coupling groove 120 Is coupled to. If the first check valve 130 is incorrectly coupled and cannot supply the heat medium from the outside through the heat medium inlet 126 to the inside of the mold, it cannot perform the function as the check valve of the present invention. It costs.

The first check valve 130 is coupled to the heat medium inlet 126, but must be coupled within a distance of 500 mm from the heat medium inlet 126. When the first check valve 130 is coupled at a distance of 500 mm or more from the heat medium inlet 126, the flow of gas (water vapor) present in the mold is severe and it is difficult to obtain a uniform temperature inside the mold. Because. The closer the length between the first check valve 130 and the heat medium inlet 126 is to maintain the temperature inside the mold as the closer it is, the mold apparatus is required to attach a separate check valve to the mold apparatus. It has the disadvantage of being complicated. In order to obtain the most stable mold temperature, it is preferable to directly couple the first check valve 130 to the heat medium inlet 126. 1 illustrates a state in which the first check valve 130 is directly coupled to the heat medium inlet 126.

In the present invention, the mold body 110 includes a second check valve 140 is coupled to the heat medium outlet (128).

The second check valve 140 is a valve to allow the fluid to flow in only one direction when the same as the first check valve 130 is coupled to the piping equipment, the inside of the heater coupling groove 120 It is coupled to the heat medium outlet 128 to flow the heat medium to the outside. Care should be taken to prevent the second check valve 140 from being incorrectly coupled.

The second check valve 140 is coupled to the heat medium outlet 128, but must be coupled at a distance within 500 mm from the heat medium outlet 128. This is because when the second check valve 140 is coupled at a distance of 500 mm or more from the heat medium outlet 128, it is difficult to maintain the temperature inside the mold uniformly. In order to obtain the most stable mold temperature, it is preferable to couple the second check valve 140 directly to the heat medium outlet 128. 1 illustrates a state in which the second check valve 140 is directly coupled to the heat medium outlet 128.

The mold apparatus 100 according to the present invention includes a first pump P ₁ connected to the first check valve 130 and supplying a heat medium or cooling water at a high pressure from the outside.

The first pump P ₁ supplies the heat medium or the cooling water to the first check valve 130 at a high pressure from the heat medium supply source 150. The first pump P ₁ supplies a heat medium or cooling water at a high pressure of 1 to 20 bar. The supply pressure of the first pump P ₁ is to fill or flow the heat medium or cooling water into the heater coupling groove 120 through the first check valve 130. Although the supply pressure of the first pump P ₁ may exceed 20 bar, it is noted that an excessive supply pressure is not necessarily required, so that it is appropriately limited. The supply pressure of the first pump P ₁ should be determined relatively with respect to the supply pressure of the second pump P ₂ . This means that the supply pressure of the first pump P ₁ should not be equal to each other when compared with the supply pressure of the second pump P ₂ . More specifically, the supply pressure of the first pump (P ₁₎ is compared to the supply pressure of said second pump (P _2), and always have a lower value than the supply pressure of the second pump (P ₂₎ . The specific reason will be described later.

The mold apparatus 100 according to the present invention includes a second pump P ₂ connected to the second check valve 140 and applying high pressure in a reverse direction with respect to the second check valve 140. have.

The second pump P ₂ supplies the heat medium or the cooling water at a high pressure in the reverse direction through the second check valve 140 from the heat medium supply source 150. In the present invention, the 'reverse direction through the second check valve 140' means that the fluid is connected to the heater coupling groove 120 through the second check valve 140. ) Means the direction acting toward the first check valve 130. The second pump P ₂ supplies the heat medium or cooling water in the reverse direction through the second check valve 140 at a high pressure of 2 to 70 bar. The reverse supply pressure of the second pump P ₂ closes the second check valve 140 so that the heat medium or cooling water in the heater coupling groove 120 flows to the outside through the second check valve 140. This is to prevent it from coming out.

The reverse supply pressure of the second pump P ₂ has its set pressure determined in two aspects. This means that it is first determined relatively in relation to the pressure of the first pump P ₁ , and secondly, it is determined in relation to the final target temperature of the heater coupling groove 120. In more detail, the reverse supply pressure of the second pump P ₂ should always be higher than the supply pressure of the first pump P ₁ . For example, when the supply pressure of the first pump (P ₁ ) is 2 bar, the reverse supply pressure of the second pump (P ₂ ) should be greater than 2 bar, if, the first pump (P ₁ ) When the supply pressure of 5 bar, the reverse supply pressure of the second pump (P ₂ ) should be greater than 5 bar, when the supply pressure of the first pump (P ₁ ) is 10 bar, the second The reverse feed pressure of the pump P ₂ means that the pressure must be greater than 10 bar. In addition, the supply pressure of the second pump P ₂ is directly related to the final target temperature of the heater coupling groove 120. Typically, when the steam pressure present in the heater coupling groove 120 is about 10 bar, the internal temperature is about 180 to 190 ° C, and when the steam pressure is about 25 bar, the internal temperature is about 200 to 220 ° C. When the water vapor pressure is about 50 bar, the internal temperature is observed to be approximately 240 ~ 250 ℃. At this time, if the reverse supply pressure of the second pump (P ₂ ) is set to 10 bar, when the gas (water vapor) pressure present in the heater coupling groove 120 is lower than 10 bar, the second check The valve 140 never opens, but if the gas (water vapor) pressure exceeds 10 bar, the second check valve 140 opens momentarily and the gas (water vapor) is discharged to the outside. When the gas (water vapor) pressure is lower than 10 bar, as soon as the second check valve 140 is closed. Thus, the pressure inside the mold is always maintained at 10 bar, keeping the corresponding temperature uniform. As a result, the reverse supply pressure of the second pump P ₂ is determined depending on how to set the temperature inside the mold. The reverse supply pressure by the second pump P ₂ may be adjusted by the regulator 138. In this case, even when using the second pump of the same pressure, it is possible to provide a different reverse supply pressure to the second check valve 140. For example, even when a pump having an output pressure of the second pump P ₂ is 70 bar, by combining the regulator 138, the reverse supply pressure is 20 bar, 30 bar, 45 bar, 50 It can be set variously like bar.

In the present invention, the first pump (P ₁ ) and the second pump (P ₂ ) is coupled to provide a supply pressure in the opposite direction when centering the heater coupling groove 120. Further, the supply pressure of the first pump P ₁ always has a smaller value than the reverse supply pressure of the second pump P ₂ .

The present invention also relates to a temperature control method of a mold by rapid heating and rapid cooling of the mold apparatus.

The temperature control method of the mold according to the present invention includes a heat medium filling step of supplying a heat medium into the inside of the heater coupling groove 120 to fill a high pressure heat medium therein.

The present invention can be performed using the mold apparatus 100. First, the first pump P ₁ is operated. The temperature control method of the mold according to the present invention supplies the first pump (P ₁ ) at a pressure of 1 ~ 20 bar. More preferably, the supply pressure of the first pump P ₁ is 2 to 7 bar. When the first pump P ₁ is operated, water as the heat medium supplied from the heat medium supply source 150 reaches the first check valve 130 at a pressure of 1 to 20 bar, and the first check. It flows into the heater coupling groove 120 through the valve 130, and is again discharged to the outside through the second check valve 140. At this time, when the first valve 134 is closed and the second valve 136 is opened, the water, which is the heat medium, is completely discharged to the outside or returns to the heat medium supply source 150 again. In this way, when the heat medium water flows through the heater coupling groove 120, the second pump P ₂ is operated to the second check valve 140 at a pressure of 2 to 70 bar. Feed the heat medium in the reverse direction. More preferably, the supply pressure of the second pump P ₂ is 5 to 30 bar, and more preferably the supply pressure of the second pump P ₂ is 7 to 20 bar. Of course, in this case, it is needless to say that the first valve 134 is opened and the second valve 136 is closed. The heat medium supplied in the reverse direction from the second pump P ₂ pushes the second check valve 140 in the reverse direction, and since the pressure in the reverse direction is much greater than the pressure in the forward direction, the second check valve 140 is automatically closed. In this state, the heat medium flowing into the heater coupling groove 120 stops as it is no longer able to escape to the outside through the second check valve 140, and the inside of the heater coupling groove 120 is stopped. The heat medium is filled with water at a pressure of 1 to 20 bar.

The temperature control method of the mold according to the present invention heats the heater cartridge 123 and converts the heat medium filled in the heater coupling groove 120 into high temperature and high pressure to heat the heating medium to maintain a predetermined mold temperature. It includes.

The present invention supplies electric energy to the heater cartridge 123 and heats it to a high temperature. The heat generated by the heater cartridge 123 immediately heats the heat medium (water) around it. However, the heat medium (water) cannot proceed in the reverse direction by the first check valve 130, and the second check valve 140 is closed, and thus cannot proceed in the forward direction, and the heater coupling groove ( 120 is trapped inside. Therefore, the heat medium is changed to a higher pressure, rises to a higher temperature, and becomes more and more gasified and converted to water vapor. Since the heat is continuously supplied from the heater cartridge 123, the heat medium water vapor forms a higher pressure, and the water vapor pressure is 2 to 70 bar which is a reverse-high pressure provided by the second pump P ₂ . Until it rises. If the pressure of the water vapor in the heater coupling groove 120 is higher than 2 to 70 bar, which is the reverse-high pressure provided by the second pump P ₂ , the second check valve 140 is automatically operated at that moment. The water vapor is instantaneously released to the outside. When the water vapor is momentarily discharged to the outside, the pressure of the water vapor in the heater coupling groove 120 immediately drops, the second check valve 140 is automatically closed at that moment.

As such, the pressure of the water vapor inside the heater coupling groove 120 is slightly discharged to the outside through the second check valve 140 at every moment, and thus the pressure of the water vapor inside the heater coupling groove 120. Is maintained almost constant, and at the same time the temperature of the steam can be maintained substantially constant. This process can be maintained for as long as necessary to manufacture the molded article.

In the injection molding operation, the injection and molding operations of the plastic melt are performed at this stage of the present invention. After molding, cooling of the mold is essential.

The temperature control method of the mold according to the present invention discharges the high temperature and high pressure heat medium existing inside the heater coupling groove 120 to the outside at the same time, the heat medium to rapidly lower the temperature of the mold by introducing a coolant from the outside It includes a discharge step.

The present invention opens the second valve 136 and simultaneously stops the operation of the second pump P ₂ or closes the first valve 134. In this case, since the reverse-high pressure applied to the second check valve 140 is released, the second check valve 140 is instantaneously opened, and the high temperature and high pressure inside the heater coupling groove 120 is released. Water vapor is discharged to the outside through the second valve 136 in an instant. When the high temperature and high pressure steam in the heater coupling groove 120 is discharged, the first check valve 130 is automatically opened, and the heat medium supplied by the first pump P ₁ is the heater. It quickly flows into the coupling groove 120, and then is quickly discharged to the outside through the second check valve 140. Since this process is performed instantaneously and continuously and automatically, the mold body 110 is rapidly cooled.

When the cooling process proceeds as described above, in the molding operation, the molded product inside the cavity is discharged to the outside, thereby completing the molding operation.

Subsequently, the mold apparatus needs to be heated again for the next operation, which may be repeated as described above.

The mold apparatus 100 according to the present invention may be applied as various modifications according to the shape of the mold body 110 for manufacturing the injection molding, and may also be implemented.

2 illustrates a first preferred embodiment of a mold body 110 corresponding to the main part of the invention.

The first preferred embodiment of the present invention is a case in which a plurality of heater coupling grooves 120 are formed in the mold body 110. FIG. 2 exemplarily shows four heater coupling grooves 120 and one heat medium inlet 126 at its inlet and one heat medium outlet 128 at its outlet. In this case, as illustrated in FIG. 2, the first check valve 130 is coupled to the heat medium inlet 126, and the second check valve 140 is coupled to the heat medium outlet 128.

In the first preferred embodiment according to FIG. 2, the cavity 30 (see FIG. 7) for filling the plastic molding is formed in a straight line and has a slight width, so as to supply uniform heat to the cavity 30. It shows a state in which four heater coupling grooves 120 are formed. Also in the case of such a mold apparatus, the method of rapidly raising the mold temperature and rapidly cooling is almost the same as described above, and therefore a detailed description thereof will be omitted.

3 illustrates a second preferred embodiment of the mold body 110 corresponding to the main part of the invention.

According to a second preferred embodiment of the present invention, a plurality of heater coupling grooves 120 are formed in the mold body 110, but the plurality of heater coupling grooves 120 are arranged according to a predetermined rule.

FIG. 3 specifically makes four heater coupling grooves 120, one heat medium inlet 126 at its inlet, and one heat medium outlet 128 at its outlet, as a combination, and The combinations of are exemplarily arranged in a clockwise or counterclockwise direction. In FIG. 3, said combination is shown as A, B, C, and D, respectively. In this case, the first check valve 130 is coupled to each heat medium inlet 126, respectively, and the second check valve 140 is coupled to each heat medium outlet 128, respectively. The number of the heater coupling groove 120 is formed to cover the width of the cavity, it can be reduced or increased as necessary.

In the second preferred embodiment according to FIG. 3, in order to supply uniform heat to the cavity 30 when the cavity 30 filling the plastic molding is formed in a rectangular shape and has a slight width, 4. It shows a state in which the combination consisting of one heater coupling groove 120, one heat medium inlet 126 and one heat medium outlet 128 is formed in a counterclockwise direction repeatedly. Also in the case of such a mold apparatus, the method of rapidly raising the mold temperature and rapidly cooling is almost the same as described above, and therefore, the detailed description thereof will be omitted.

4 is a view illustrating another third embodiment of the present invention, and FIGS. 5A to 5C are views for explaining a main part of the third embodiment. In this case, the first check valve 130 and the second check valve 140 are omitted in the drawing.

According to a third preferred embodiment of the present invention, a plurality of heater coupling grooves 120 are formed inside the mold body 110, and the heater coupling grooves 120 are the main heater coupling grooves 122 and the auxiliary heaters. Subdivided into a coupling groove 124, the heating medium outlet 128 is formed in the main heater coupling groove 122, while the heating medium inlet 126 is formed in the auxiliary heater coupling groove 124, The case where such a basic structure is arranged by a certain rule is shown.

FIG. 4 specifically forms four main heater coupling grooves 122, one heating medium outlet 128 is coupled to its inlet, and one auxiliary heater coupling groove (at the end of the main heater coupling groove 122). 124 is formed, and a state in which one heat medium inlet 126 is formed in the auxiliary heater coupling groove 124 is made into a pair of combinations, and the pair of combinations are repeatedly clockwise or counterclockwise. The arrangement is illustrated. In the present invention, the pair of combinations are represented by A, B, C and D, respectively. In this case, the first check valve 130 is coupled to each heat medium inlet 126, respectively, and the second check valve 140 is coupled to each heat medium outlet 128, respectively.

In the third preferred embodiment of the present invention, since the mechanical structure of the mold body 110 is slightly complicated and requires a functional description thereof, this will be described in detail with reference to FIGS. 4 and 5A to 5C. I would like to.

5A illustrates a state in which a plurality of main heater coupling grooves 122, auxiliary heater coupling grooves 124, a heat medium inlet 126, and a heat medium outlet 128 are formed in the mold body 110 of the third embodiment. Partial perspective cross-sectional view shown,

5B is a cross-sectional view illustrating a coupling relationship between the auxiliary heater coupling groove 124 and the heat medium inlet 126 of the mold body 110 of the third embodiment.

5C is a conceptual diagram illustrating a coupling relationship between the main heater coupling groove 122, the auxiliary heater coupling groove 124, and the heat medium inlet 126 of the mold body 110 of the third embodiment.

A third embodiment according to the present invention includes a plurality of main heater coupling groove 122 and one auxiliary heater coupling groove 124 in the mold body 110, the main heater coupling groove 122 It includes a heat medium inlet 128 formed at the inlet of the heat medium inlet 126 coupled to the auxiliary heater coupling groove 124, they form a pair of combinations, the combination is clockwise or counterclockwise It is repeatedly formed while rotating. The plurality of main heater coupling grooves 122 are arranged in parallel in the longitudinal direction of the cavity 30. The heater cartridge 123 is mounted inside the main heater coupling groove 122. In addition, the number of the main heater coupling groove 122 is specifically determined in proportion to the width of the cavity (30). For uniform heat transfer to the cavity 30, it is preferable to arrange a plurality of main heater coupling grooves 122 such as to surround the cavity 30 beyond the width of the cavity 30. In addition, the main heater coupling groove 122 is preferably disposed so as to form the same interval between the other main heater coupling groove 122 adjacent to each other.

In the present invention, the auxiliary heater coupling groove 124 is formed at the end of the main heater coupling groove 122. An auxiliary heater cartridge 125 is mounted inside the auxiliary heater coupling groove 124. The auxiliary heater coupling groove 124 serves to partially complement the heat supply function at the end of the main heater coupling groove 122. Since the amount of heat generated at the end of the main heater coupling groove 122 is significantly less than that of the central portion thereof, the auxiliary heater cartridge 125 mounted inside the auxiliary heater coupling groove 124 is insufficient. Because it supplements. The auxiliary heater coupling groove 124 is formed to be shifted with respect to the main heater coupling groove 122 at a predetermined angle. The predetermined angle may vary depending on the shape of the cavity 30. When the cavity 30 is formed in a quadrangular shape, the predetermined angle is formed at right angles as illustrated in the accompanying drawings. In addition, the auxiliary heater coupling groove 124 is in communication with the main heater coupling groove 122. This is because the heat medium present in the mold flows freely inside the auxiliary heater coupling groove 124 and the main heater coupling groove 122, thereby transmitting a uniform amount of heat to the cavity 30 as a whole. To give.

In the present invention, the main heater coupling groove 122, the auxiliary heater coupling groove 124 and the heat medium inlet 126 is coupled to each other forming a predetermined angle therebetween, more specifically It is preferable that each of them is coupled to each other at right angles. In FIG. 5A, the coupling relationship between them is illustrated as being coupled to each other with respect to the X, Y, and Z axes. For example, when the main heater coupling groove 122 is coupled in the Y-axis direction, the auxiliary heater coupling groove 124 is coupled in the X-axis direction, and the heat medium inlet 126 is Z-axis. It is combined in the direction.

In the present invention, the heat medium inlet 126 is formed in the end direction of the plurality of the main heater coupling groove 122, and is in communication with the auxiliary heater coupling groove 124 in a right angle direction. Since the auxiliary heater cartridge 125 is mounted inside the auxiliary heater coupling groove 124, the heating medium cannot directly flow into the auxiliary heater coupling groove 124 from the outside, and independently controls whether the heating medium is introduced. This is because it must be installed in a separate position from the auxiliary heater coupling groove 124 to operate.

In the present invention, the heat medium outlet 128 is formed in the head direction of the plurality of main heater coupling grooves 122 and communicates with the plurality of main heater coupling grooves 122. The heat medium outlet 128 is preferably formed in a direction perpendicular to the longitudinal direction of the plurality of main heater coupling grooves 122. The heat medium outlet 128 is closed by the second check valve 140 (see FIG. 1) during the heating process.

Also in the case of the mold apparatus 100 according to the third embodiment configured as described above, the operation method is similar to that described above. Briefly described as follows.

The heat medium is pressurized by the first pump P ₁ to be supplied to the first check valve 130, and the first check valve 130 flows the heat medium through the heat medium inlet 126. The heating medium flows into the main heater coupling groove 122 communicated with the heating medium through the auxiliary heater coupling groove 124, and is further externally connected to the heating medium outlet 128 and the second check valve 140 coupled thereto. To be discharged. At this time, when the heat medium is pressed in the reverse direction through the second check valve 140 and the reverse-high pressure is applied by the second pump P ₂ , the second check valve 140 is closed and the main heater The coupling groove 122 and the auxiliary heater coupling groove 124 is filled with a heat medium. In this state, when the heater cartridge 123 and the auxiliary heater cartridge 125 are heated, the heat medium filled in the main heater coupling groove 122 and the auxiliary heater coupling groove 124 is heated, and at a high temperature and high pressure. Converted to gas. When the pressure of the gas present in the main heater coupling groove 122 is greater than the reverse-high pressure of the second check valve 140, the second check valve 140 is opened to discharge the gas to the outside. However, as soon as the internal gas pressure of the main heater coupling groove 122 is lower than the reverse-high pressure of the second check valve 140, the second check valve 140 is immediately closed. While repeating this process continuously and automatically, the temperature of the mold body 110 is kept uniform.

On the other hand, when the mold body 110 is to be cooled quickly, the reverse-high pressure provided by the second pump P ₂ is released, and the second check valve 140 is opened. When the second check valve 140 is opened, the high temperature and high pressure gas existing in the main heater coupling groove 122 and the auxiliary heater coupling groove 124 is immediately discharged to the outside, and At the same time, the external heat medium is introduced through the first check valve 130. The introduced heat medium absorbs heat of the mold body 110 as low temperature water and is immediately discharged to the outside through the second check valve 140 again. Through this process, the mold body 110 is quickly cooled.

FIG. 6 is an exemplary view showing a case in which the mold apparatus 100 according to the present invention is actually used. The first pump P ₁ and the second pump P ₂ are coupled to the heat medium source 150, and this is performed. The state coupled to the mold body 110 is shown in more detail. 6 is a detailed view illustrating the present invention, and a description thereof has already been made in detail above, and thus description thereof will be omitted.

In the above description, the mold for molding the injection mold and the temperature control method of the mold according to the present invention have been described in detail, but this is only for describing the most preferred embodiments of the present invention, and the present invention is not limited thereto. The scope is defined and defined by the claims.

In addition, any one of ordinary skill in the art can make various modifications and imitations according to the description in the specification of the present invention, but it will be apparent that this is also outside the scope of the present invention.

100: injection molding apparatus according to the present invention
110: body of the mold, 120: heater coupling groove,
122: main heater coupling groove, 123: heater cartridge,
124: auxiliary heater coupling groove, 125: auxiliary heater cartridge,
126: heat medium inlet, 128: heat medium outlet,
130: first check valve, 134: first valve,
136: first valve, 138: regulator,
140: second check valve, 150: heat medium supply source

Claims (12)

In the mold apparatus for injecting the plastic melt,
It is formed in the inside of the mold and the heater coupling groove 120 for mounting the heater cartridge 123 to supply heat to the cavity, and formed in the inlet or outlet of the heater coupling groove 120 and the mold from the outside And a heat medium inlet 126 capable of supplying a heat medium to the inside, and a heat medium outlet 128 formed at an outlet or inlet of the heater coupling groove 120 and capable of discharging the heat medium from the inside of the mold to the outside. A mold body 110;
A first check valve 130 coupled to the heat medium inlet 126 and allowing the heat medium to flow only from the outside into the heater coupling groove 120;
A second check valve 140 coupled to the heat medium outlet 128 and allowing the heat medium to flow outwardly only from the heater coupling groove 120;
A first pump P ₁ connected to the first check valve 130 and supplying a heat medium or cooling water to the heater coupling groove 120 at a high pressure from the outside; And
A second pump (P ₂ ) connected to the second check valve (140) and applying a high pressure in a reverse direction to the heater coupling groove (120) through the second check valve (140); To
Injection molding mold apparatus, characterized in that it further comprises.
The method of claim 1,
The heat medium inlet 126 is formed in the inlet or outlet direction of the heater coupling groove 120,
The heating medium outlet 128 is formed in the exit direction or the inlet direction of the heater coupling groove 120, injection molding mold apparatus, characterized in that.
The method of claim 1,
The first check valve 130 is coupled to a distance within 500 mm from the heat medium inlet 126,
The second check valve 140 is injection molding mold apparatus, characterized in that coupled to the distance within 500 mm from the heat medium outlet (128).
delete The method of claim 1,
When performing the mold heating process,
The first pump (P ₁ ) is to supply the heat medium or cooling water to the heater coupling groove 120 at a high pressure of 1 to 20 bar,
The second pump (P ₂ ) is to supply the heat medium or cooling water in the reverse direction to the heater coupling groove 120 at a high pressure of 2 to 70 bar,
Injection pressure mold apparatus, characterized in that the supply pressure of the first pump (P ₁ ) has a lower value than the supply pressure of the second pump (P ₂ ).
The method of claim 1,
The mold body 110 includes a plurality of heater coupling grooves 120 therein,
The heat medium inlet 126 is formed at one of the inlet or outlet of the plurality of heater coupling groove 120,
The heat medium outlet (128) is an injection molding mold apparatus, characterized in that one is formed at the outlet or inlet of the plurality of heater coupling groove (120).
The method of claim 1,
A plurality of heater coupling grooves 120 are formed in the mold body 110, but one heat medium inlet 126 is provided at the inlet of the heater coupling groove 120, and one heat medium outlet 128 is formed at the outlet thereof. Form the
The one heat medium inlet 126 and the one heat medium outlet 128 and the plurality of heater coupling grooves 120 are made into one combination,
Injection mold apparatus characterized in that the combination is formed by repeatedly arranged in the clockwise or counterclockwise direction.
The method of claim 7, wherein
The heater coupling groove 120 is subdivided into a plurality of main heater coupling groove 122 and one auxiliary heater coupling groove 124, the auxiliary heater coupling portion at the end of the main heater coupling groove 122 124 in a right angle,
While the heat medium outlet 128 is coupled to the head direction of the plurality of main heater coupling grooves 122, the heat medium inlet 126 is coupled to the auxiliary heater coupling groove 124 to form a single coupling structure. Combination,
Injection mold apparatus characterized in that the combination is formed by repeatedly arranged in the clockwise or counterclockwise direction.
The method of claim 8,
The main heater coupling groove 122, the auxiliary heater coupling groove 124 and the heat medium inlet 126 is a coupling relationship between them, the main heater coupling groove 122 is in the Y-axis direction When coupled to, the auxiliary heater coupling groove 124 is coupled in the X-axis direction, the heat medium inlet 126 is injection molding mold apparatus, characterized in that coupled in the Z-axis direction.
In the temperature control method of the injection mold,
The heat medium is supplied to the inside of the heater coupling groove 120 through the first check valve 130 from the outside, and then the heat medium of the high pressure in the opposite direction to the heater coupling groove 120 through the second check valve 140. By supplying, the heat medium filling step of filling the heat medium of the high pressure in the heater coupling groove 120;
When the heater cartridge 123 mounted inside the heater coupling groove 120 is heated to convert the heat medium to high temperature and high pressure, and the pressure of the heat medium is greater than the reverse supply pressure of the second check valve 140. Heating the heating medium to maintain and heat the heating medium temperature of the heater coupling groove 120 to a predetermined temperature by allowing the heating medium to be discharged to the outside through the second check valve 140 only;
After molding the moldings present in the cavity, the high temperature and high pressure heat medium present in the heater coupling groove 120 is quickly discharged to the outside through the second check valve 140, Heat medium discharge step of rapidly lowering the temperature of the mold by injecting the cooling water through the first check valve 130; To
Temperature control method of the mold apparatus characterized in that it comprises.
11. The method of claim 10,
The first check valve 130 is coupled to the external first pump P ₁ and operated,
The second check valve 140, the temperature control method of the mold apparatus, characterized in that for operating by coupling an external second pump (P ₂ ).
The method of claim 11,
Supply pressure of the heat medium by the first pump (P ₁ ) is 1 ~ 20 bar,
The reverse-supply pressure of the heat medium by the second pump (P ₂ ) is 2 ~ 70 bar temperature control method of the mold apparatus.

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