KR20110011090A - Injection molding apparatus having heat shunting and cooling plate and method of using the same - Google Patents

Injection molding apparatus having heat shunting and cooling plate and method of using the same Download PDF

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Publication number
KR20110011090A
KR20110011090A KR1020090068555A KR20090068555A KR20110011090A KR 20110011090 A KR20110011090 A KR 20110011090A KR 1020090068555 A KR1020090068555 A KR 1020090068555A KR 20090068555 A KR20090068555 A KR 20090068555A KR 20110011090 A KR20110011090 A KR 20110011090A
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KR
South Korea
Prior art keywords
plate
mold
cooling plate
heat
heating
Prior art date
Application number
KR1020090068555A
Other languages
Korean (ko)
Inventor
강명호
Original Assignee
강명호
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Publication date
Application filed by 강명호 filed Critical 강명호
Priority to KR1020090068555A priority Critical patent/KR20110011090A/en
Publication of KR20110011090A publication Critical patent/KR20110011090A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7312—Construction of heating or cooling fluid flow channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7331—Heat transfer elements, e.g. heat pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7368—Heating or cooling of the mould combining a heating or cooling fluid and non-fluid means

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE: An injection molding device having a heat shunting and cooling plate and a control method thereof are provided to reduce the temperature deviation for each position of a heating plate by operating a thermal convert -cooling plate as an auxiliary heat source. CONSTITUTION: An injection molding device having a heat shunting and cooling plate comprises a first mold and a second mold(20). The second mold comprises a heating plate(30) and a thermal convert-cooling plate(50). The heating plate has first and second planes and first and second cavity surfaces. The second cavity surface forms a cavity along with the first cavity surface. The thermal convert - cooling plate comprises third and fourth plates and a cooling member.

Description

Injection molding apparatus with heat transfer-cooling plate and control method {INJECTION MOLDING APPARATUS HAVING HEAT SHUNTING AND COOLING PLATE AND METHOD OF USING THE SAME}

The present invention relates to injection molding, and more particularly to heating and cooling an injection molding apparatus.

Injection molding of synthetic resin or metal refers to obtaining a cavity-shaped molded product by injecting and cooling a molten synthetic resin or metal between a fixed mold (cavity mold) having a cavity and a movable mold (core mold) having a core.

In injection molding, when the molten material is injected, the temperature of the mold is preferably the same as that of the molten material. It can improve the flow of injected material and the transferability of the pattern on the cavity surface and reduce the deformation caused by residual stress after the molten material is hardened.

Because. In addition, after the injection of the molten material is completed, it is preferable to lower the temperature of the mold so that the completed material is cooled quickly to shorten the cycle time of the injection molding to increase productivity.

However, increasing the temperature of the mold improves fluidity and transferability, but it takes a lot of time to cool down, resulting in a long cycle time of injection molding. In order to shorten the cycle time, if the mold is made small in size to cool rapidly, There is a problem in that the rigidity is weak due to deformation or poor durability of the product.

As a method for improving this problem, Patent Publication Nos. 0644920, 0644926 and 0644922 disclose an injection molding apparatus having a core mold separated into an intermediate core mold plate and a core mold support plate. With this injection molding apparatus, the intermediate core mold plate is rapidly heated to an appropriate temperature using an electric heater, and at the same time, the core mold support plate is cooled to an appropriate temperature, the mold is molded, and the injection material is injected to form the mold. do. In the process of molding the mold, the intermediate core mold plate is cooled while being in contact with the core mold support plate which has been cooled in advance, thereby enabling rapid cooling of the intermediate core mold plate. Therefore, as soon as injection of the injection material is completed, the injection material starts to solidify, thereby reducing the injection molding cycle time.

However, the conventional injection molding apparatus having a separated core mold has a problem that the durability of the separated intermediate core mold plate is weak, and there is also a problem that a temperature deviation occurs for each position of the intermediate core mold.

An object of the present invention is to provide an injection molding apparatus and a method of controlling the same.

According to the present invention, there is provided an injection molding apparatus comprising a first mold including a first cavity surface and a second mold including heating means, wherein the second mold is separated from the first surface and the first surface. A heating plate having a second surface, the first surface facing the first cavity surface and including a second cavity surface which forms a cavity together with the first cavity surface; A third surface coupled to the second surface of the heating plate and a fourth surface spaced apart from the third surface, and cooling means is installed between the third and fourth surfaces, and the thermal conductivity coefficient is higher than that of the heating plate. Heat shunting and cooling plate (Heat shunting and cooling plate), wherein the heating means is a heat conversion, characterized in that installed between the first side of the heating plate and the fourth side of the heat conversion-cooling plate An injection molding apparatus having a cooling plate is provided.

According to another aspect of the present invention, in the injection molding method, the mold includes a first mold including a first cavity surface, a second mold including heating means, and the second mold includes the first surface and the same. A heating plate having a second surface away from the first surface, the first surface comprising a second cavity surface facing the first cavity surface and forming a cavity together with the first cavity surface; A third surface coupled to the second surface of the heating plate and a fourth surface spaced apart from the third surface, and cooling means is installed between the third and fourth surfaces, and the thermal conductivity coefficient is higher than that of the heating plate. Heat shunting and cooling plate (Heat shunting and cooling plate), wherein the heating means is a heat conversion, characterized in that installed between the first side of the heating plate and the fourth side of the heat conversion-cooling plate Providing an injection molding apparatus having a cooling plate; Moving the second mold in the first mold direction to form the cavity between the first cavity surface and the second cavity surface; Operating the heating means to heat a heating plate; Injecting molten injection material into the cavity; Cooling the heat conversion-cooling plate to improve the heat diffusion from the heat conversion-cooling plate to the heat conversion-cooling plate is provided.

The injection molding apparatus having a heat shunting and cooling plate according to the present invention and a control method thereof have the following effects.

First, heat transfer-cooling plates having a higher thermal conductivity than heating plates heat up faster than heating plates. Therefore, in the heating step, the heat conversion-cooling plate acts as a heat source for transferring heat to the heating plate through conduction. This reduces the time for the heating plate to reach a temperature suitable for injection molding. The cycle time is thus reduced and productivity is improved.

Second, as described above, since the heat deflection-cooling plate acts as an auxiliary heat source in the heating step, the positional deviation of the temperature of the heating plate can be reduced. In the absence of the heat deflection-cooling plate, a temperature deviation occurs in the heating plate located near and far from the position where the heating means is installed, but this deviation is reduced when the heat deflection-cooling plate is installed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention may be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

1 is a block diagram schematically showing an injection molding apparatus having a heat shunting and cooling plate according to a first embodiment of the present invention. As shown in FIG. 1, the injection part is a portion for injecting material for molding into the cavity, and includes a screw 124 installed inside the heating cylinder 122 and the heating cylinder 122, and the screw 124 is rotated. It is provided with a hydraulic motor 120. In addition, a hydraulic cylinder 110 is provided to move the second mold fixing plate 60. In addition, the first mold 20 is fixed to the first mold fixing plate 10 and the first mold fixing plate 10 is provided to be in close contact with the heating cylinder 122 during injection and melted in the cavity through the injection passage 23 Injection material is injected.

The inside of the heating cylinder 122, the screw 124 is installed in the longitudinal direction of the heating cylinder 122, one side is connected to the screw 124, the hydraulic motor 120 for rotating the screw 124 is It is installed. In addition, the injection control unit 310 is installed to be electrically connected to the hydraulic cylinder 110, the hydraulic motor 120 and the mold temperature control unit 320, the mold temperature control unit 320 is a heat conversion-cooling plate (50). A valve 322 for controlling the flow of the cooling water flowing in the cooling water pipe 53 installed in the cooling water pipe, the heat transfer heater 33 installed on the heating plate 30, the temperature sensor 80 installed on the heating plate 30, and It is installed to be electrically connected.

FIG. 2 is a schematic view showing a state in which a mold of the injection molding apparatus having a heat conversion-cooling plate shown in FIG. 1 is opened, and FIG. 3 is a schematic view showing a state in which the mold shown in FIG.

2, a first cavity surface 21 into which molten injection material is injected is formed in the first mold 20, and an injection passage 23 of molten injection material is formed in the first cavity surface 21. Is connected. In addition, the first mold 20 is formed with a guide hole 22 for inserting the guide pin 51.

The second mold includes a heating plate 30 and a heat deflection-cooling plate 50. The second cavity surface 31 is formed on the surface facing the first cavity surface 21 of the heating plate 30. Referring to FIG. 3, the second cavity surface 31 forms a cavity C into which molten injection material is injected together with the first cavity surface 21. The heat conversion-cooling plate 50 is coupled to the heating plate 30, and a plurality of grooves 36 are formed at the interface where the heating plate 30 and the heat conversion-cooling plate 50 are coupled to each other. The heat transfer heater 33 for heating the heating plate 30 is inserted in the groove 36. The heat transfer heater 33 is configured such that an insulation coating surrounds heating wires such as nichrome, tungsten, and titanium series. In addition, in order to increase the contact area between the heating plate 30 and the heat conversion-cooling plate 50 and at the same time to promote heat transfer, the space between the groove 36 into which the heat transfer heater 33 is inserted and the heat transfer heater 33. The copper member 37 is filled in. The heating heater 33 may use one heating wire or may be installed using a plurality of heating wires. In addition, the heating plate 30 is provided with a temperature sensor 80. The temperature sensor 80 measures the temperature of the heating plate 30 in real time and transmits it to the mold temperature control unit 320 to appropriately control the amount of heat generated by the heat transfer heater 33 to maintain the temperature of the heating plate 30 in a certain range. To be able. Although one temperature sensor 80 is shown in this embodiment, a plurality of temperature sensors may be provided as necessary. In particular, when it is desired to control the heating value of the heat transfer heater to have a different temperature for each part of the mold surface, it is preferable to install a temperature sensor for each part of the desired temperature.

The heat deflection-cooling plate 50 is made of a material having a higher thermal conductivity than the heating plate 30. For example, it consists of aluminum, copper, or an alloy containing them. In the heating step, the heat conversion-cooling plate 50 serves to shorten the heating time of the heating plate 30 and to uniformly heat the heating plate 30. In addition, it serves to reinforce the thin heating plate 30. Hereinafter, with reference to Figure 4, in the heating step, the role of the heat conversion-cooling plate 50 will be described in detail. When the electric power is supplied to the electric heater 33, the temperature of the heating plate 30 and the heat conversion-cooling plate 50 increases while the electric heater 33 generates heat. At this time, since the thermal conductivity coefficient of the heat conversion-cooling plate 50 is larger, the temperature rises faster than the heat conversion-cooling plate 50 than the heating plate 30. As a result, a temperature difference occurs at the boundary between the heat deflection-cooling plate 50 and the heating plate 30, and from the high heat deflection-cooling plate 50 until the temperature becomes the same as shown in FIG. Thermal conductivity is achieved in the direction of the heating plate 30 having a low temperature. That is, the heat deflection-cooling plate 50 also acts as a kind of heat source. Therefore, the temperature of the heating plate 30 can be raised more quickly than when the heat conversion-cooling plate 50 is not used. In addition, as shown in FIG. 4, when the heat deflection-cooling plate 50 is not used, a deviation occurs in the surface temperature Ts of the heating plate 30 depending on the distance from the heat transfer heater 33. When the heat deflection-cooling plate 50 is used, the deviation from the heat dissipation heater 33 is reduced by heating the heat conducted from the heat deflection-cooling plate 50. Of course, if more time passes, even if there is no heat conversion-cooling plate 50, the variation in the surface temperature (Ts) is reduced, the time can be shortened by using the heat conversion-cooling plate (50). As a result, the use of the heat deflection-cooling plate 50 shortens the time for the second cavity surface 31 formed on the heating plate 30 to reach a temperature distribution suitable for injection molding, and as a result, the cycle time is reduced. It is effective.

The heat conversion-cooling plate 50 is provided with cooling means for maintaining the heat conversion-cooling plate 50 at a constant temperature so as to cool the heating plate 30. In the present embodiment, the cooling means includes a cooling water tank (not shown), a pump for circulating the cooling water, and a cooling water pipe 53 formed inside the heat conversion-cooling plate 50. Cooling water pipe 53 is connected in the heat conversion-cooling plate 50, the inlet port and the outlet port is shown on the side of the heat conversion-cooling plate 50 is formed. Guide pins 51 are installed on the heat conversion-cooling plate 50. The guide pin 51 is inserted into the guide hole 22 formed in the first mold 20 through the heat conversion-cooling plate 50 and the heating plate 30.

Hereinafter, referring to FIG. 7, the operation of the injection molding apparatus having the heat deflection-cooling plate according to the first embodiment will be described. A method of manufacturing an injection molded article using the mold apparatus according to the present embodiment is as follows.

The electric heating heater 33 is supplied with current to heat the heating plate 30 and the heat conversion-cooling plate 50. The heated heat deflection-cooling plate 50 transfers heat to the heating plate 30 so that the heating plate 30 is heated quickly and uniformly. At the same time, in the state shown in FIG. 1 in which the mold apparatus 100 of this embodiment is installed in the injection molding machine, the first mold 20 and the heating plate are moved by moving the second mold fixing plate 60 in the left direction (to the cavity mold side) in the drawing. (30) to be in close contact. After moving the second mold fixing plate 60 to bring the first mold 20 and the heating plate 30 into close contact with each other, the heating plate 30 is heated, or after the heating plate 30 is heated, the second mold fixing plate ( The first mold 20 and the heating plate 30 may be brought into close contact with each other by moving 60.

When the heating plate 30 reaches a temperature suitable for injection, the molten injection material is injected into the cavity C formed as shown in FIG. 3, and the power source of the heat transfer heater 33 is turned off during the injection or when the injection is completed. Block it. At the same time, the cooling water flows into the cooling water pipe 53 of the heat conversion-cooling plate 50 to cool the heat conversion-cooling plate 50 to maintain a temperature necessary for efficient cooling. The heat conversion-cooling plate 50 serves as a heat source for transferring heat to the heating plate 30 in the heating step, and serves to cool the heating plate 30 to solidify the injection material in the cooling step. . When the injection is completed and the solidification of the injection material is completed, the cooling of the heat conversion-cooling plate 50 is stopped, and the second mold fixing plate 60 is moved backward (in the right direction in the figure) to guide pin 51. It is to be separated from the guide hole 22. The injection molded product is removed from the cavity C, and the above process is repeated to perform injection.

5 is a schematic view showing a mold in a mold of the injection molding apparatus having a heat conversion-cooling plate according to a second embodiment of the present invention, Figure 6 is a heat conversion-cooling according to a third embodiment of the present invention It is a schematic diagram which shows the state in which the metal mold | die of the injection molding apparatus provided with a plate was opened. 5 and 6 differ from the embodiment shown in FIGS. 2 and 3 in the position of the electric heater. The installation position of the heat transfer heater may be changed according to the characteristics of the injection material to be molded or the shape of the injection molded product.

As shown in FIG. 5, when the electrothermal heater 33 is installed on the heating plate 30, there is an advantage that the temperature of the heating plate 30 can be raised more quickly. As shown in FIG. 6, When the heat transfer heater 33 is installed in the heat conversion-cooling plate 50, there is an advantage that the temperature of the heating plate 30 can be made more uniform.

The present invention has been described in detail with reference to embodiments, but the present invention is not limited to the above embodiments, and many modifications can be made by those skilled in the art within the technical idea of the present invention. Is obvious.

For example, although the cooling water pipe is described as being installed in the heat deflection-cooling plate, it is also possible to form a cooling water channel in the heat deflection-cooling plate itself without installing a separate pipe.

In addition, although the eject pins for separating the injection-molded product from the mold are not shown in the present embodiments, an eject pin for ejecting the molded product from the mold in the case of a product in which the product is not naturally released from the mold is shown. Must be installed.

1 is a block diagram schematically showing an injection molding apparatus having a heat deflection-cooling plate according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a state in which the mold of the injection molding apparatus having the heat deflection-cooling plate shown in FIG. 1 is opened.

3 is a schematic view showing a state in which the mold shown in FIG.

4 is a view for explaining the temperature distribution of the surface of the heating plate of the mold shown in FIG.

FIG. 5 is a schematic view showing a state in which a mold of an injection molding apparatus having a heat conversion-cooling plate according to a second embodiment of the present invention is opened.

Figure 6 is a schematic view showing a state in which the mold of the injection molding apparatus having a heat conversion-cooling plate according to a third embodiment of the present invention is opened

7 is a flow chart showing an injection molding method of an injection molding apparatus having a heat conversion-cooling plate according to a first embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: first mold fixing plate 20: the first mold

30: heating plate 33: electric heater

50: heat transfer-cooling plate 53: cooling water piping

60: second mold fixing plate 80 temperature sensor

Claims (4)

In the injection molding apparatus comprising a first mold comprising a first cavity surface, a second mold comprising a heating means, The second mold, A first surface and a second surface spaced apart from the first surface, the first surface comprising a second cavity surface facing the first cavity surface and forming a cavity with the first cavity surface; Heating plate; A third surface coupled to the second surface of the heating plate and a fourth surface spaced apart from the third surface, and cooling means is installed between the third and fourth surfaces, and the thermal conductivity coefficient is higher than that of the heating plate. Heat shunting and cooling plate (Heat shunting and cooling plate); And the heating means is installed between the first surface of the heating plate and the fourth surface of the heat conversion-cooling plate. The method of claim 1, The heat conversion-cooling plate, Injection molding apparatus having a heat conversion-cooling plate, characterized in that it comprises at least one metal of copper or aluminum. The method of claim 1, The heating means, And a heat conversion-cooling plate, which is installed between the second surface of the heating plate and the third surface of the heat conversion-cooling plate. In the injection molding method, A first mold comprising a first cavity surface, a second mold comprising a heating means, the second mold having a first surface and a second surface away from the first surface, the first mold comprising: a first mold; A heating plate facing the first cavity surface, the heating plate including a second cavity surface forming a cavity together with the first cavity surface; A third surface coupled to the second surface of the heating plate and a fourth surface spaced apart from the third surface, and cooling means is installed between the third and fourth surfaces, and the thermal conductivity coefficient is higher than that of the heating plate. Heat shunting and cooling plate (Heat shunting and cooling plate), wherein the heating means is a heat conversion, characterized in that installed between the first side of the heating plate and the fourth side of the heat conversion-cooling plate Providing an injection molding apparatus having a cooling plate; Moving the second mold in the first mold direction to form the cavity between the first cavity surface and the second cavity surface; Operating the heating means to heat a heating plate; Injecting molten injection material into the cavity; And cooling the heat conversion-cooling plate to improve the heat diffusion from the heat conversion-cooling plate to the heat conversion-cooling plate.
KR1020090068555A 2009-07-27 2009-07-27 Injection molding apparatus having heat shunting and cooling plate and method of using the same KR20110011090A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090068555A KR20110011090A (en) 2009-07-27 2009-07-27 Injection molding apparatus having heat shunting and cooling plate and method of using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090068555A KR20110011090A (en) 2009-07-27 2009-07-27 Injection molding apparatus having heat shunting and cooling plate and method of using the same

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KR20110011090A true KR20110011090A (en) 2011-02-08

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KR1020090068555A KR20110011090A (en) 2009-07-27 2009-07-27 Injection molding apparatus having heat shunting and cooling plate and method of using the same

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