KR101239360B1 - Injection Molding of Cooling System - Google Patents

Abstract

The present invention relates to a cooling system for injection molding.
In the cooling system of the injection molding, the present invention provides an air inlet line for supplying compressed air from a compressed air supply device to an evaporator, and an air discharge line for discharging low-temperature compressed air, a cooling medium produced in the evaporator, to the outside. An air line comprising; A compressor that compresses the refrigerant to generate a high temperature and high pressure refrigerant gas, an oil separator for separating the compressor oil from the high temperature and high pressure refrigerant, a condenser for condensing the high temperature and high pressure refrigerant into a liquid refrigerant, and a pure liquid from the condensed refrigerant. A refrigerant circulation line including an infusion separator for separating only a refrigerant in a state, and an expansion valve for supplying the refrigerant in a liquid state of high temperature and high pressure to a low pressure and supplying the same to an evaporator; A control unit which controls the air line and the refrigerant circulation line as a whole so as to receive a signal from an injection machine and perform a cooling process; And a core pin in which a coolant circulated by the coolant circulation line is introduced to cool the injection molded product, and a cooling hole is formed to cool the hole or the threaded part of the injection molded product. .

Description

[0001] Injection Molding of Cooling System [0002]

The present invention relates to a cooling system for injection molding. More specifically, the material of the core pin provided in the injection molding is changed to a material having good thermal conductivity, and by supplying low temperature compressed air to the inner diameter of the cooling fin, it rapidly cools a specific high-temperature part that does not cool the injection molding. A cooling system for injection molding which shortens the cooling time.

BACKGROUND ART [0002] In general, injection molding is a technique for producing a material such as a thermosetting resin or a thermoplastic resin into various types of injection molds. The injection molding process includes a metering process for metering the molten resin in the mold, an injection process for filling the molten resin in the mold, A cooling step of solidifying the filled resin, a mold-opening step of opening the mold after cooling, and a taking-out step of taking out the molded article formed in the mold are sequentially performed.

In the injection molding made of such a process, an upper mold and a lower mold forming a mold of a mold are formed, and a cavity is formed between the upper mold and the lower mold for the shape of the product, and an injection molding is molded, or between the upper mold and the lower mold. The core is installed in the mold to mold the injection in the cavity between the core and the upper mold.

On the other hand, a cooling process, which is a process for solidifying the resin after the injection process in the injection molding process, forms a cooling water hole in which the cooling water circulates in the mold in order to uniform the thermal conductivity of the mold and to improve the shape of the product And a natural cooling method in which the cooling is performed spontaneously.

However, in the cooling method of injection molding according to the prior art, when the shape of the injection molding requires the processing of a plurality of specific holes (Hole), in the case of an injection molded product having a complicated shape such as an injection molding with a large number of screw holes, a hole in which a core pin is inserted There was a problem that the cooling of the screw portion or the like is not made smoothly. Accordingly, there was a problem that the deformation of the product occurs, such as tearing of the injection molding or shrinkage after injection during the mold opening process.

In order to solve the above problems, the present invention changes the material of the core pin provided in the injection molding to a material having good thermal conductivity, and supplies a low temperature compressed air to the cooling pin of the inner diameter so that the specific high temperature portion does not cool the injection molding. The purpose is to shorten the cooling time of the injection molding by rapid cooling.

In addition, an object of the present invention is to be able to carry out injection molding without changing the shape of a plurality of injection moldings, such as a plurality of holes or screw shapes formed in the injection molding, so that high-quality injection molding can be mass-produced in a short time.

In order to achieve the above object, the present invention provides an air inlet line for supplying compressed air from a compressed air supply device to an evaporator in a cooling system of injection molding, and low temperature compressed air, which is a cooling medium produced in an evaporator, externally. An air line including an air discharge line for discharging the air; A compressor for compressing the refrigerant to generate a refrigerant gas at a high temperature and high pressure, an oil separator for separating the compressor oil from the refrigerant gas at a high temperature and high pressure, a condenser for condensing the refrigerant gas at a high temperature and high pressure with a liquid refrigerant, and a condensed refrigerant A refrigerant circulation line including an infusion separator for separating only a refrigerant in a pure liquid state, and an expansion valve for dropping the liquid refrigerant at a high temperature and high pressure into a low pressure to supply it to an evaporator; A control unit which controls the air line and the refrigerant circulation line as a whole so as to receive a signal from an injection machine and perform a cooling process; And a core pin in which a coolant circulated by the coolant circulation line is introduced to cool the injection molded product, and a cooling hole is formed to cool the hole or the threaded part of the injection molded product. .

In addition, in the present invention, the air inlet line is a water separator for removing water and oil contained in the compressed air (Water Separator); The refrigerant in the low temperature state is connected to the water separator to remove various foreign substances contained in the compressed air, and to control the air pressure (Filter-Regulator), the heat exchanged compressed air supplied through the water separator and the filter regulator An evaporator in which heat exchange is made to produce; And a supply control valve controlling a supply amount of cooling air in a low temperature state discharged from the evaporator.

In addition, in the present invention, the air discharge line is a supply control valve which is opened and closed by the control unit to control the supply amount of the refrigerant in a low temperature state discharged from the evaporator, and the temperature sensing to be controlled by the control unit, the temperature of the refrigerant is measured It provides a cooling system for injection molding comprising a portion.

In addition, in the present invention, the evaporator is provided with a cooling tube formed with aluminum cooling fins provided in the pressure tank therein, and a blocking plate for supporting the cooling fins, and forming a section of the flow in which the coolant is circulated. A cooling system for injection molding is provided.

In addition, in the present invention, the core pin is made of a material having good thermal conductivity, provides a cooling system of injection molding, characterized in that the cooling fin is formed to be cooled by the refrigerant in the inner diameter.

In addition, in the present invention, the fluid separator is a filter dryer for supplying only the condensed refrigerant in a pure state by removing the foreign matter contained in the condensed refrigerant; A control valve which opens and closes according to the control of the controller and enables supply of the condensed refrigerant stored in the sap separator; Located in the liquid pipe connecting the liquid separator and the evaporator in the refrigerant circulation line to control the flow rate of the condensed refrigerant flowing into the evaporator, and includes an expansion valve for reducing the high-pressure liquid refrigerant to the saturation pressure corresponding to the required low temperature Provided is a cooling system for injection molding.

According to the present invention, by changing the material of the core pin provided in the injection molding to a material having good thermal conductivity, and by supplying the low-temperature compressed air to the cooling pin in its inner diameter, it is easier to cool the specific high temperature site where the injection product is not cooled. Since it can be cooled directly by contact, there is an effect that can shorten the cooling time of the injection molding by rapid cooling.

In addition, according to the present invention, the injection molding can proceed without changing the shape of the injection-molded injection hole formed in the hole or screw shape, etc. formed in the injection molding, there is an effect that can mass-produce a high-quality injection molding in a short time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a cooling system of injection molding according to a preferred embodiment of the present invention;
Figure 2 shows a cooling system for injection molding according to a preferred embodiment of the present invention,
3 is a view showing an evaporator of a cooling system of injection molding according to a preferred embodiment of the present invention;
4 is an enlarged view illustrating main parts of FIG. 3 according to a preferred embodiment of the present invention;
5A and 5B show a core pin of a cooling system of injection molding according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a schematic view showing a cooling system for injection molding according to a preferred embodiment of the present invention, Figure 2 is a view showing a cooling apparatus for injection molding according to a preferred embodiment of the present invention, Figure 3 is a preferred embodiment of the present invention 4 shows an evaporator of a cooling apparatus for injection molding according to an embodiment, FIG. 4 is an enlarged view of the main part of FIG. 3 according to a preferred embodiment of the present invention, and FIGS. 5A and 5B are views of injection molding according to a preferred embodiment of the present invention. It is a figure which shows the core pin of a cooling apparatus.

As shown, the cooling system of the injection molding according to the present invention is an air line 100 for supplying compressed air to the evaporator 130, and a refrigerant circulation line for supplying and circulating the refrigerant generated through the evaporator 130 200 and when the cooling process is performed during injection molding, it is configured to include a control unit 202 for receiving a signal of the injection machine to control the overall cooling device.

The air line 100 discharges the compressed air of the low temperature compressed air, which is a cooling medium produced by the evaporator 130, and the air inlet line 102 to supply the compressed air from the compressed air supply device to the evaporator. By preventing the damage of the), the cooling device is configured to include an air discharge line 104 to be driven stably.

When the compressed air is introduced, the air inflow line 102 is connected to the water separator 110 and the water separator 110 to remove water and oil contained in the compressed air. Filter-Regulator (120) for removing foreign matter and adjusting the air pressure, the evaporator (130) for heat exchange with the air while the refrigerant of low pressure evaporates.

Water Separator 110 is a component that removes moisture contained in compressed external air supplied through a compressed air supply device such as an air compressor, and supplies only pure air to the evaporator 130. 99.9% of the water contained in the compressed air to be separated so that the separated water is discharged through the outlet 112 formed in the lower portion of the water separator (110).

The filter-regulator 120 removes fine foreign substances contained in the compressed air in a water-separated state, adjusts the pressure of the compressed air supplied to the evaporator 130, Adjust the air supply.

Gauge 160 is a component for measuring the pressure of the compressed air supplied from the air inlet line (102).

Evaporator 130 is the most important component in the cooling device, in particular, the compressed air supplied through the water separator 110 and the filter regulator 120 of the air line 100 is configured to produce a low-temperature refrigerant by heat exchange do.

The evaporator 130 constitutes a cooling tube 136 formed with aluminum cooling fins 134 provided in a pressure tank formed inside the body 132 while using compressed air smaller than the specific heat of water. The heat exchange between the compressed air can be maximized.

That is, the evaporator 130 of the present invention is made compact by reducing the size of the overall evaporator while increasing the heat transfer area of the compressed air that is the cooling liquid and the refrigerant, so as to evaporate the conventional compressed air of the compressed tank inside the evaporator 130. As the size increases, it takes up a lot of space and overcomes the problem of increasing the production cost of the product.

Meanwhile, in the evaporator 130 of the present invention, the cooling tube 136 is supported from the main body 132 of the evaporator 130, and at the same time, a blocking plate 138 is formed to form a section of the flow in which the coolant circulates. It is configured to increase the flow of air and promote heat transfer to maximize the efficiency of the evaporator 130.

Air discharge line 104 is a supply control valve 140 is configured in the air discharge line 104 to control the supply amount of the compressed air of the low-temperature state produced from the evaporator 130, the supply control valve 140 Is configured to be opened and closed under the control of the controller 202 to be described later.

In addition, the air discharge line 104 is controlled by the controller 202 when the compressed air is discharged from the evaporator 130, by configuring a temperature sensor 150 for measuring the temperature of the compressed air, If the temperature provided from 150 is less than or equal to the set temperature, the controller 202 temporarily stops driving of the cooling device to reduce unnecessary power consumption, thereby further maximizing the efficiency of the cooling device.

On the other hand, the refrigerant circulation line 200 is a compressor 220 for compressing the refrigerant supplied from the evaporator 130 to produce a refrigerant gas of high temperature and high pressure, an oil separator 230 for separating the compressor oil from the refrigerant gas of high temperature and high pressure, Condenser 240 for condensing the refrigerant gas of the high temperature and high pressure to the liquid state refrigerant, the receiver 250 for separating only the pure liquid refrigerant from the condensed refrigerant, the pressure of the liquid refrigerant of the high temperature and high pressure drop to low pressure evaporator It is configured to include an expansion valve 260 for supplying to (130).

The compressor 220 is configured to compress the refrigerant temperature and pressure of the low temperature and low pressure supplied from the evaporator 130 into a refrigerant having a high temperature and high pressure so as to condense and circulate the refrigerant.

A liquid separator 210 is provided between the compressor 220 and the evaporator 130 to separate the liquid refrigerant discharged from the evaporator 130 so that only pure gas refrigerant is discharged to the compressor 220.

In order to produce low temperature compressed air, the evaporator 130 itself must be operated in the form of low pressure, thereby causing an abnormality in the cooling operation during the cooling process of injection molding.

In other words, if the refrigerant is not completely evaporated in the evaporator 130 due to the lack of load of the evaporator 130 or the heat exchange amount, and is sucked together with the compressed air cooled in the compressor 220 in the liquid refrigerant state, the compressor 220 Due to the high pressure compression of), the volume of the vaporized refrigerant gas increases as the liquid vaporizes into steam, which reduces the amount of steam inhaled by the compressor 220. Therefore, it is manufactured so as to exchange heat with the high temperature and high pressure gas of the compressor 220 rather than the general liquid separator, and serves to condense the refrigerant 240 of the high temperature and high pressure of the compressor 220 and simultaneously compress the liquid refrigerant of the compressor 220. It is desirable to fabricate to prevent.

The oil separator 230 is a component that separates the working oil of the compressor 220, which is included when the refrigerant is compressed through the compressor 220, from the refrigerant. The oil separator 230 is connected to the compressor 220 to separate the compressed refrigerant from the oil of the compressor 220 and discharge only the pure refrigerant from which the oil is separated to the condenser 240.

At this time, the refrigerant discharged to the condenser 240 is to form a plurality of holes, or screw shape formed in the complex injection molded by the gas-type refrigerant discharged from the compressor 220 is transmitted to the cooling process of the injection machine While circulating through the ejector pin or the core pin 300 to be inserted, the cooling fin 310 for cooling, and the manifold configured for air distribution, the latent heat of the mold is absorbed and condensed into the refrigerant in a liquid state. The condenser 240 is moved.

Particularly, in the case of the core pin 300, since the refrigerant is not continuously supplied in the cooling process according to the molding of a hole or a screw shape formed in a complex injection molding, a high temperature portion of the injection product in which the core pin 300 is inserted (Hot Spots) had to wait until the mold is completely solid, but the mold had to be opened, in the present invention, as shown in Figures 5a and 5b, the material of the core pin 300 is made of a good thermal conductivity material, the core pin ( The inner diameter of 300) should be specially processed.

That is, the core fin 300 of the present invention, as shown in Figure 5a, the cooling fin 310 is formed to be cooled by the refrigerant in its inner diameter, when the low-temperature compressed air flows during the cooling process cooling Cooling is generated from the front of the fin 310, and accordingly, the heat exchange is performed by the injection molding and the heat conduction phenomenon, and thus the quenching is reduced, thereby reducing the overall cooling time of the complicated injection molding and reducing the defective rate such as product release, thereby improving productivity. .

This is because the coolant introduced through the cooling fins 310 circulates through the cooling fins 310, and thus has a cooling hole formed to be discharged through the cooling fins 310, thereby performing a cooling process very easily. You can do it.

In particular, since the compressed air in the factory is used as it is, and it is not a high-pressure compressed air, it can be cooled more safely, and it is also possible to cool the mold when cooling the injection process due to the low temperature refrigerant discharged from the cooling fins 310.

Such cooling fins 310 are specially insulated with a thin thickness, and are preferably coupled as close as possible to the cooling fins 310 of the core to minimize heat loss.

In addition, the cooling fin 310 is adjusted according to the size and length of the processing hole formed in the core fin 310 and the end of the cooling fin 310 is positioned so that the cooling capacity of the coolant in a low temperature state can be conducted to the surface of the injection molded product. It is preferable to.

In addition, the shape of the cooling fins 310 may be modified to be used as a structure in which the refrigerant is injected directly into the injection molded product.

In other words, the mold is composed of the fixed side and the moving side. In other words, the injection molding is made between the fixed side and the moving side, and is produced in the cavity, and since the mold is closed under high pressure, only a small gap is formed. Due to the nature of the refrigerant, it is possible to supply a large amount of flow rate even with such a small gap, so that it is possible to directly cool by directly contacting the difficult part of the shape of the injection molding.

On the other hand, the fan 270 and the motor 280 is of course configured in the condenser 240 to circulate the outside air to more effectively condensate the refrigerant transferred to the condenser 240. However, it is not limited thereto.

In addition, when the gas refrigerant is condensed through the condenser 240, the condensed refrigerant is discharged to the receiver 250 to reuse it.

The fluid separator 250 is a component that stores the condensed refrigerant and supplies only a predetermined amount to the evaporator 130 under the control of the controller 202.

At this time, between the fluid separator 250 and the evaporator 130 to remove the foreign substances contained in the condensed refrigerant to filter the filter dryer (Filter Dryer: 170), the filter to supply only the pure condensed refrigerant in the control of the control unit 202 According to the control valve 290 and the evaporator 130 to control the flow rate of the control valve 290, the evaporator 130 is made to open or close the supply and condensation of the refrigerant stored in the sap separator 250 and the refrigerant circulation line 200 of the It is composed of an expansion valve 260 for reducing the high-pressure liquid state refrigerant located in the liquid pipe connecting the fluid separator 250 and the evaporator 130 to a saturation pressure corresponding to the required low temperature.

The cooling system of the present invention configured as described above changes the material of the core pin 300 provided in the injection molding to a material having good thermal conductivity, and supplies the low temperature compressed air to the cooling fin 310 of the inner diameter to cool the injection molding. It is possible to directly contact certain high temperature parts that are not supported and to directly cool, thereby shortening the cooling time of the injection molding by rapid cooling, and without changing the shape of an injection molded product having a large number of holes or screws formed in the injection molded product. It is a very useful invention that can carry out injection molding and can mass produce high quality injections in a short time.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

100: air line 102: air inlet line
104: air discharge line 110: water separator
120: Filter Regulator 130: Evaporator
132: main body 134: cooling fins
136: cooling tube 138: blocking plate
140: supply control valve 150: temperature sensing unit
160: gauge 170: filter drier
200: refrigerant circulation line 202: control unit
210: liquid separator 220: compressor
230: oil separator 240: condenser
250: receiver 260: expansion valve
300: core fin 310: cooling fin

Claims (6)

In the cooling system of injection molding,
An air line including an air inlet line for supplying compressed air from a compressed air supply device to an evaporator, and an air discharge line for discharging low-temperature compressed air, which is a cooling medium produced in the evaporator, to the outside;
A compressor that compresses the refrigerant to generate a high temperature and high pressure refrigerant gas, an oil separator for separating the compressor oil from the high temperature and high pressure refrigerant, a condenser for condensing the high temperature and high pressure refrigerant into a liquid refrigerant, and a pure liquid from the condensed refrigerant. A refrigerant circulation line including an infusion separator for separating only a refrigerant in a state, and an expansion valve for supplying the refrigerant in a liquid state of high temperature and high pressure to a low pressure and supplying the same to an evaporator;
Control unit for overall control of the air line and the refrigerant circulation line to receive the signal of the injection machine to perform the cooling process
A coolant circulated by the coolant circulation line is introduced to cool the injection molding, and a cooling fin is formed at an inner diameter to cool the hole or the threaded portion of the injection molding, and the coolant introduced through the cooling fin circulates the cooling fin. After that, the cooling pin is formed to be discharged through the cooling fins again.
Cooling system of injection molding comprising a.
The method of claim 1,
The air inlet line
A water separator for removing water and oil contained in the compressed air;
A filter regulator connected to the water separator to remove various foreign matters contained in the compressed air and to control air pressure;
A filter drier for filtering compressed air from which foreign matters are separated through the filter regulator, and filtering even moisture contained in the compressed air;
An evaporator in which heat exchange is performed to heat the compressed air supplied through the water separator and the filter regulator to produce a low temperature refrigerant; And
Supply control valve for controlling the supply amount of the cooling air of the low temperature state discharged from the evaporator
The cooling system comprising:
The method of claim 1,
The air discharge line
And a supply control valve which is opened and closed by a control unit to control the supply amount of the refrigerant in the low temperature state discharged from the evaporator, and a temperature sensing unit controlled by the control unit and measuring a temperature of the refrigerant. .
The method of claim 2,
The evaporator is cooled in the injection molding, characterized in that the cooling tube formed with aluminum cooling fins provided in the pressure tank therein, and a blocking plate for supporting the cooling fins, forming a section of the flow of the coolant is circulated system.
delete The method of claim 1,
A control valve which opens and closes according to the control of the controller and enables supply of the condensed refrigerant stored in the sap separator;
An expansion valve that controls the flow rate of the condensed refrigerant flowing into the evaporator and is located in the liquid pipe connecting the fluid separator and the evaporator in the refrigerant circulation line, and reduces the high pressure liquid refrigerant to the saturation pressure corresponding to the required low temperature.
The cooling system comprising:

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