KR20130032885A - Injetion mold with rapid heating and cooling cycles and injection method thereof - Google Patents

Abstract

PURPOSE: An injection mold device and an injection method thereof are provided to intensively heat a cavity for rapid heating and to enhance an air cooling effect during cooling. CONSTITUTION: An injection mold device capable of rapidly heating and cooling comprises a core mold(200) and a cavity mold. The core mold comprises a heating core(210) and a core mold fixing plate(220). The heating core is cut in a specific thickness depending on the shape of a cavity, and includes a bending heater(211) on the cut surface. The core mold fixing plate fixes the heating core and comprises a cooling member including a cooling waterway insulation hole(230) and a second insulation hole(240). The cooling waterway insulation hole cools the core mold fixing plate and the bending heater. The second insulation hole cools air and has a diameter which is bigger than the diameter of the cooling waterway insulation hole.

Description

Injection mold apparatus capable of rapid heat cooling and its injection method {Injetion mold with rapid heating and cooling cycles and Injection method

The present invention is an injection mold apparatus having a core mold and a cavity mold, the core mold is cut to a certain thickness according to the cavity shape and the heating core with a built-in banding heater on the cutting surface, and the core core having a cooling means and cooling means It comprises a fixed plate;

 The cooling means of the core mold fixing plate includes a heat insulating hole for cooling the core mold fixing plate and the banding heater on the opposite side of the cavity at a space away from the heating core,

And further comprising a second heat insulating hole that is secondly cooled in a space separated from the cooling water heat insulating hole;

The cooling channel heat insulating hole 230 is a first cooling channel insulating hole 231 formed in parallel with the bending heater 211 in the heating core 210 between the bending heater 211 and the second insulating hole 240. The first cooling channel insulation hole 231 and the second cooling channel insulation hole passed between the second cooling channel insulation hole 232 and the second insulation hole 240 formed at right angles to the bending heater 211. It relates to a rapid heating cooling injection mold apparatus comprising a connection cooling water insulated hole (233) connecting the (232).

The present invention is also an injection method using a rapid heating cooling injection mold apparatus,

A heating step of separating the core mold after the injection molding from the cavity mold and separating the cooled injection molding product and simultaneously heating the bending heater of the heating core;

An injection process of coupling the core mold to form a cavity and a cavity to turn off the heating heater and to supply the molten synthetic resin from the injection machine to the cavity;

Cooling process for cooling the injection of the cavity by supplying the cooling water to the heat insulation hole with the cooling water after the injection operation to cool the injection of the cavity, and intensive cooling of the cavity injection of the heating core by the adiabatic action of the second heat insulation hole;

After the cooling process, the cooling water supply is cut off, the cooling water is discharged, the air is cooled to the cooling means hole and the second heat insulation hole, the core mold is released, the injection molding is taken out, and the heating core is preheated with a banding heater for the next process. It relates to a rapid heating cooling injection method that performs the process repeatedly.

Rapid heating cooling technology is used for the purpose of rapidly heating and rapidly cooling the mold in the vicinity of the cavity to increase the injection productivity.

Currently used technology is to dig a tubular hole into a mold at a certain distance, insert a heater, and then dig an additional tubular hole for cooling and pass it through a hole or through a heating medium to quickly convert heating and cooling. Although the configuration is known as Korean Patent Registration No. 10-0890905, since the mold itself needs to be heated, the amount of heating heat increases, and rapid cooling of the rapid heating takes a lot of cooling time, resulting in a drop in yield.

In addition, there is a technique for making rapid heating and cooling by making a channel of a predetermined space in a mold, embedding a heater in the channel, and supplying a cold / hot heat medium to the space between the outside of the heater and the channel, but it is known as Korean Patent Registration No. 10-0888985. In addition, heat loss is high because the whole mold must be heated and cooled.

In addition, the core mold is separated and the heater is embedded in the intermediate core mold plate, and the intermediate core mold plate and the core mold are combined with guide pins springed with springs, and the core mold is separated from the intermediate core mold plate after heating the heater. The structure that improves heating and cooling efficiency by preventing the heat from being transmitted to the entire core mold was developed in Korea Patent Registration No. 10-0644922, but the intermediate core mold plate should be separated separately, and combined with guide pins and elastic springs. Since it has to be configured, the durability and the mold cost rises.

The present invention is to solve this problem, an object of the present invention is to heat the banding heater to the core mold connected to the injection molding machine and the core mold for releasing action to the core mold fixing plate on the opposite side of the cavity, with a row of cooling water insulation holes, It is to provide a rapid heat-cooling injection mold apparatus and an injection method for forming a heat-insulated hole to double-insulate the heat effect to concentrate the heating effect in the cavity to enable rapid heating, and to increase the air cooling effect during cooling.

Another object of the present invention is to form a hot water banding heater in a core mold connected to an injection molding machine and a core mold having a releasing action, in a core mold fixing plate and a heating core opposite to the cavity, and a second stage separate from the cooling water insulating hole. It is to provide a rapid heat-cooling injection mold apparatus and an injection method for forming a hot hole so as to double heat insulation to concentrate the heating effect in the cavity to enable rapid heating, and to increase the air cooling effect during cooling.

Another object of the present invention is to form the heat of the banding heater in the core mold fixing plate opposite to the cavity in the core mold which is released from the cavity mold connected to the injection mold, or the cooling water insulation hole formed in the core mold fixing plate and the heating core is cooled Cooling water is supplied at the time of operation, and functions as an insulated hole when insulated, and the second insulated hole blocks thermal shear by cooling or insulated or by air cooling, and maximizes heat loss by reducing the heat transfer area. And an injection method thereof.

To this end, the present invention in the injection mold apparatus having a core mold and a cavity mold,

The core mold includes a heating core cut into a predetermined thickness according to the cavity shape and having a banding heater built in the cut surface, and a core mold fixing plate having a cooling means fixed to the heating core;

 The cooling means of the core mold fixing plate includes a heat insulation hole with a cooling water for cooling the core mold fixing plate and the heating core opposite the cavity at a space away from the heating core,

And further comprising a second heat insulating hole that is secondarily cooled in a space separated from the cooling water heat insulating hole;

The cooling water channel heat insulation hole includes a first cooling water heat insulation hole formed in parallel with a banding heater in a heating core between the banding heaters, a second cooling water heat insulation hole formed in a direction perpendicular to the banding heater at the back of the second heat insulation hole, and a second It comprises a connection cooling water heat insulation hole connecting the first cooling water insulation hole and the second cooling water insulation hole passing through the insulation hole.

The present invention is also an injection method using a rapid heating cooling injection mold apparatus,

A heating step of separating the core mold after the injection molding from the cavity mold and separating and extracting the cooled injection molding and heating the banding heater of the heating core;

An injection process of coupling the core mold to form a cavity and a cavity to turn off the heating heater and to supply the molten synthetic resin from the injection machine to the cavity;

Cooling process for cooling the injection of the cavity by supplying the cooling water to the heat insulation hole with the cooling water after the injection operation to cool the injection of the cavity, and intensive cooling of the cavity injection of the heating core by the adiabatic action of the second heat insulation hole;

After the cooling process, the cooling water supply is cut off, the cooling water is discharged, the air is cooled to the cooling means hot air and the second heat insulating hole, the core mold is released, the injection molding is taken out, and the heating core is preheated with a banding heater for the next process. The process is repeated sequentially.

The present invention forms the heat of the banding heater in a core mold connected to the injection molding machine and the core mold having a mold release function, and heats the heat by forming a heat insulation hole and a second heat insulation hole of a second row in a core mold fixing plate opposite to the cavity. The effect is concentrated in the cavity to enable rapid heating and to increase the air cooling effect when cooling.

The present invention is to form a heat insulation hole and a second heat insulation hole separate from the heat insulation hole and the cooling water formed by forming the heat of the banding heater in the core mold fixed plate and the heating core opposite to the cavity in the cavity mold connected to the injection molding machine and the core mold having a releasing action. Thus, the present invention provides a rapid heat-cooling injection mold apparatus and an injection method thereof, in which double heating is performed to concentrate heating effects in a cavity to enable rapid heating, and to increase an air cooling effect during cooling.

The present invention is to form the heat of the banding heater in the core mold fixed plate on the opposite side of the cavity, or in the core mold connected to the injection mold cavity and mold release function, or the cooling water formed in the core mold fixing plate and the heating core is a cooling water at the time of cooling Rapid heat-cooled injection mold apparatus and injection method for maximizing heat loss by supplying and insulated to function as a heat insulating hole, and a second heat insulating hole to block heat shear during cooling, heat insulating, or air cooling, and to reduce heat transfer area. To provide.

1 is an explanatory view of the heating step after taking out the injection molding showing an example of the present invention,
2 is an explanatory view of an injection process showing an example of the present invention;
3 is an explanatory diagram of a cooling process showing an example of the present invention;
Figure 4 is an injection molding process drawing showing an example of the present invention,
5 is an explanatory view of the heating step after the injection of the injection molding showing another example of the present invention,
6 is an explanatory view of an injection process showing another example of the present invention;
7 is an explanatory diagram of a cooling process showing another example of the present invention;
8 is an injection molding process drawing showing another example of the present invention,
9 is a process flow diagram of the present invention;
10 is a control block diagram of the present invention;
11 is a cross-sectional view showing an actual use example of the present invention,
FIG. 12 is an enlarged horizontal cross-sectional view of FIG. 11.

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

An example of the present invention is an injection mold apparatus having a core mold and a cavity mold as shown in FIGS. 1 to 4.

The core mold 200 is cut to a certain thickness according to the cavity 201 shape, and a heating core 210 having a bending heater 211 built in the cut surface, and a core mold fixing plate having a cooling means for fixing the heating core 210. 220, including;

 The cooling means of the core mold fixing plate 220 is a coolant heat insulating hole 230 for cooling the core mold fixing plate 220 and the banding heater 211 on the opposite side of the cavity 201 and spaced apart from the heating core 210,

Rapid heat-cooled injection mold apparatus, characterized in that it further comprises a second heat insulating hole (240) for cooling the secondary air in a place separated from the cooling water heat insulating hole (230).

The diameter of the second heat insulating hole 240 is configured to be larger than the diameter of the cooling water path insulating hole 230.

The cooling water path insulating hole 230 is disposed between the second heat insulating holes 240.

In another example of the present invention in the injection mold apparatus having a heater and cooling means in at least one core mold or cavity mold as shown in Figure 5 to 8,

The core mold 200 is cut to a certain thickness according to the cavity 201 shape, and a heating core 210 having a bending heater 211 built in the cut surface, and a core mold fixing plate having a cooling means for fixing the heating core 210. 220, including;

 The cooling means of the core mold fixing plate 220 is a cooling water heat insulating hole 230 for cooling the core mold fixing plate 220 and the heating core 210 opposite to the cavity 201 at a spaced apart from the heating core 210.

It further comprises a second heat insulating hole 240 for cooling the secondary air in a place separated from the cooling water heat insulating hole 230;

The cooling channel heat insulating hole 230 is a first cooling channel insulating hole 231 formed in parallel with the bending heater 211 in the heating core 210 between the bending heater 211 and the second insulating hole 240. The first cooling channel insulation hole 231 and the second cooling channel insulation hole passed between the second cooling channel insulation hole 232 and the second insulation hole 240 formed at right angles to the bending heater 211. It comprises a connection cooling water insulating hole 233 to connect the (232).

The coolant sealing pad 234 may be added to the edge of the first cooling channel heat insulating hole 231 and to be in contact with the core mold fixing plate 220 and the heating core 210.

Injection method using the rapid heating cooling injection mold apparatus of the present invention, as shown in the process flow diagram of FIG.

A heating step of separating the core mold from the cavity mold after injection molding and separating the cooled injection molding product and simultaneously heating the bending heater of the heating core (S10);

Next, the injection mold (S20) of combining the core mold and the cavity mold to form a cavity to turn off the heating heater and supply the molten synthetic resin from the injection machine to the cavity;

Cooling step (S30) of supplying the cooling water to the heat insulating hole with a cooling water after the injection operation to cool the banding heater and the heating core to cool the injection of the cavity and the central injection of the heating core by the adiabatic action of the second heat insulation hole (S30);

After the cooling process, the cooling water supply is cut off, the cooling water is discharged, the air is cooled to the cooling means hot air and the second heat insulating hole, the core mold is released, the injection molding is taken out, and the heating core is preheated with a banding heater for the next process. The process (S40) is repeatedly performed sequentially.

10 is a control block diagram of the present invention, the power supply unit 310 for generating a direct current or alternating current power to apply a heating power when the contact of the relay (Ry) is turned on in parallel or series connected bending heater (211);

A cooling water pump 340 for supplying the cooling water 235 to the cooling water heat insulating hole 230 when the cooling water valve 341 is opened in the cooling water tank 320 to circulate the cooling water tank 320;

An air valve 331 which is opened when the coolant valve 341 is closed and the coolant pump 340 is turned off;

An air pump 330 passing through the air valve 331 to supply air to the heat insulating hole 230;

Recognizing whether or not the set temperature of the temperature sensor 212 through the input terminal (I1) and recognizes the set temperature, the relay Ry is turned off through the output terminal (P5), the air pump 330 through the output terminal (P1) And a controller 300 for driving the coolant pump 340 through the output stage P2 and driving the coolant valve 341 and the air valve 331 through the output stage P3 and P4. . In the above description, the banding heater 211, the cooling water path insulation hole 230, and the second insulation hole 240 are formed in the core mold 200, but the same structure is symmetrically formed in the cavity mold as necessary. It is well known that it can be configured.

FIG. 11 is a cross-sectional view illustrating the shape of the mold according to the present invention, and FIG. 12 is an enlarged horizontal cross-sectional view of the main part of FIG. 11, wherein the core mold 200 is cut to a predetermined thickness according to the cavity 201 shape and a banding heater at the cutting surface. 11, a heating core 210 having a built-in heater (in the case of FIG. 11, but other heating fluid may be used) and a core mold fixing plate 220 fixing the heating core 210 and having a cooling means. ).

 The cooling means of the core mold fixing plate 220 is a cooling water insulation hole 230 for cooling the core mold fixing plate 220 and the heating core 210 opposite to the cavity 201 at a spaced apart from the heating core 210. ,

A second heat insulating hole 240 that cools secondarily in a space separated from the cooling water heat insulating hole 230;

The cooling channel heat insulating hole 230 is a first cooling channel insulating hole 231 formed in parallel with the bending heater 211 in the heating core 210 between the bending heater 211 and the second insulating hole 240. The second cooling channel insulation hole 232 formed in parallel with the banding heater 211 and the second cooling hole insulation hole 231 and the second cooling channel insulation hole 231 pass through the second insulation hole 240. And a connection cooling water insulating hole 233 connecting the 232.

The cooling water sealing pad 234 is added to a portion where the edge of the first cooling water insulating hole 231 contacts the core mold fixing plate 220 and the heating core 210. In this case, the pad for sealing the cooling water may be a silicone material for sealing the cooling water, and may be coated with a mixture of an insulating paint (for example, a brand name "insulin") and silicon to realize insulation and sealing properties.

Referring to the operation of the present invention configured as described above are as follows.

After the injection-molded product 102 is taken out as shown in FIGS. 1 and 5, the controller 300 output stages P3 and P2 are opened to open the coolant valve 341 and drive the coolant pump 340 for injection of the next process. Command through. Subsequently, after cooling, the output level of the output stages P3 and P2 of the control unit 300 are changed to close the coolant valve 341, stop the operation of the coolant pump 340, and the air pump 330 is operated to cool the heat insulating hole ( 230 is supplied with air. At the same time, the junction banding heater 211 is connected to the heating core 210 and the core mold fixing plate 220 of the core mold 200 by turning on the relay Ry by the command of the output terminal P5 of the control unit 300 to supply the power 310. A heating process (S10) is performed to heat the heating core 210 having the cavity 201 of the core mold 200 by applying power. This stops the cooling water supply and heats the heating core 210 in a state where the air is filled in the heat insulating hole 230 with the cooling water, thereby enabling rapid heating. This is because the cooling water insulator 230 and the second insulator 240 are double insulated (there are each arranged in a horizontal alternating), the heat to the other side of the cavity without a separate cooling material Since it blocks by the air cooling method, the cavity 201 functions to rapidly and intensively heat up.

Subsequently, the core mold 200 is moved to the fixed cavity mold 100 as shown in FIGS. 2 and 6 to secure the cavity 201 space, and to the bending heater 211 through the output terminal P5 of the controller 300. Power supply unit 310 stops supplying power. At the same time, the molten injection of the injection machine 101 is supplied to the cavity 201 through the gate to perform the injection process (S20). Here, the power supply to the bending heater 211 is stopped to prevent overheating of the heating core 210.

3 and 7 while the injection molding machine 101 maintains the injection pressure, the control unit 300 drives the coolant pump 340 by applying a high level output signal to the output stages P2 and P3, and the cooling water. By opening the valve 341 (opening can be implemented by a solenoid valve method or the like, a description of the principle of operation is omitted and simply described). The cooling water 235 of the cooling water container 320 shown in FIG. It is supplied to the heat insulating hole 230 to be discharged to the outlet 230a to achieve water cooling. In this principle, a cooling process (S30) for performing rapid cooling is performed. In this case, since the cooling water path insulation hole 230 for supplying the cooling water 235 is located between the banding heater 211 and the second insulation hole 240, the second insulation hole 240 is formed at a predetermined interval at a rear portion thereof. Since the adiabatic function is performed, the cooling effect is mainly concentrated to the heating core 210 to appear as a factor of rapid cooling. This becomes a factor to enable the thermal insulation effect and rapid cooling without separating the heating core 210 and the core mold fixing plate 220 separately. In this case, as shown in FIGS. 7, 11, and 12, the banding heater is formed behind the first cooling channel insulation hole 231 and the second insulation hole 240, which parallel the cooling water heat insulating hole 230 with the banding heater 211. Rapid heating effect because the second cooling water arranged in a direction perpendicular to the 211 and the heat insulating hole 232 and the connection cooling water insulating hole 233 connecting them to the heating core 210 and the cavity 201 in the opposite direction. Becomes high.

Subsequently, after the cooling step S30, the core mold 200 is separated from the cavity mold 100 fixed as shown in FIGS. 4 and 8 (opening of the mold). Subsequently, the injection molding extraction process (S40) for taking out the injection molding product 102 is performed. Subsequently, the closing action of the coolant valve 341 and the turn-off of the coolant pump 340 are performed by the control unit 300 output (low level) command. In addition, the air pump 330 is driven by applying a high level through the output terminal P1 of the control unit 300, and at the same time, the air valve 331 is commanded to open by applying a high level output to the output terminal P4. This discharges the cooling water applied to the cooling water insulation hole 230 to the outlet 230a to be stored in the cooling water container 320, and instead, the cooling water insulation hole 230 is filled with air to prevent over cooling. That is, it prevents the heating core 210 from being cooled any more and serves to shorten the heating time of the repeated heating process (S10).

The present invention simply arranges the bending heater 211 along the curved surface of the cavity 201 (actually, FIGS. 11 and 12 can be illustrated), and the cooling water path insulation hole 230 and the second insulation hole 240 are provided. It is divided into two-layer structure, and each cooling water heat insulating hole 230 and the second heat insulating hole 240 are arranged to cross each other horizontally to achieve a thermal insulation effect, such as the so-called netting tightly installed, separate equipment Since it is insulated to enable rapid heating and rapid cooling only by air cooling without installing, even when the injection molding is concave or convex, the effect of heat insulation during heating and cooling is great without the need for the installation of insulation equipment by heating and cooling separately.

100; cavity mold 101; injection machine 102; injection product 200; core mold 201; cavity 210; heating core 211; bending heater 220; core mold fixing plate 230; cooling water insulator 231; first cooling water insulator 232; second cooling water inlet Insulation hole 233; connection cooling water heat insulation hole 234; Coolant sealing pad 235; Cooling water 240; Second insulation hole 300; Control unit 310; Power supply unit 320; Cooling water container 330; Air pump 331; Air valve 340; Cooling water pump 341; Cooling water valve

Claims (4)

In the injection mold apparatus having a core mold and a cavity mold,
The core mold 200 is cut to a certain thickness according to the cavity 201 shape, and a heating core 210 having a bending heater 211 built in the cut surface, and a core mold fixing plate having a cooling means for fixing the heating core 210. 220, including;
The cooling means of the core mold fixing plate 220 is a cooling water heat insulating hole 230 for cooling the core mold fixing plate 220 and the heating core 210 opposite to the cavity 201 at a spaced apart from the heating core 210.
It further comprises a second heat insulating hole 240 for cooling to a second in a place separated from the cooling water heat insulating hole 230;
The cooling channel heat insulating hole 230 is a first cooling channel insulating hole 231 formed in parallel with the bending heater 211 in the heating core 210 between the bending heater 211 and the second insulating hole 240. The first cooling channel insulation hole 231 and the second cooling channel insulation hole passed between the second cooling channel insulation hole 232 and the second insulation hole 240 formed at right angles to the bending heater 211. Rapid cooling cooling injection mold apparatus, characterized in that it comprises a connection cooling water insulated hole (233) connecting the 232.
According to claim 1, Rapid cooling, characterized in that the cooling water sealing pad 234 is added to the edge of the first cooling channel heat insulating hole 231 and the contact portion between the core mold fixing plate 220 and the heating core 210. Coolable injection molder.
According to claim 1, Power supply unit 310 for generating a direct current or alternating current power to apply a heating power when the contact of the relay (Ry) is turned on in parallel or series connected bending heater (211);
A cooling water pump 340 for supplying the cooling water 235 to the cooling water heat insulating hole 230 when the cooling water valve 341 is opened in the cooling water tank 320 to circulate the cooling water tank 320;
An air valve 331 which is opened when the coolant valve 341 is closed and the coolant pump 340 is turned off;
An air pump 330 passing through the air valve 331 to supply air to the heat insulating hole 230;
Recognizing whether or not the set temperature of the temperature sensor 212 through the input terminal (I1) and recognizes the set temperature, the relay Ry is turned off through the output terminal (P5), the air pump 330 through the output terminal (P1) And a controller 300 for driving the coolant pump 340 through the output stage P2 and driving the coolant valve 341 and the air valve 331 through the output stage P3 and P4. Injection molding apparatus capable of rapid heating cooling.
An injection method using the rapid heating cooling injection mold apparatus of claim 1,
A heating step of separating the core mold after the injection molding from the cavity mold and separating and extracting the cooled injection molding and heating the banding heater of the heating core;
An injection process of coupling the core mold to form a cavity and a cavity to turn off the heating heater and to supply the molten synthetic resin from the injection machine to the cavity;
Cooling process for cooling the injection of the cavity by supplying the cooling water to the heat insulation hole with the cooling water after the injection operation to cool the injection of the cavity, and intensive cooling of the cavity injection of the heating core by the adiabatic action of the second heat insulation hole;
After the cooling process, the cooling water supply is cut off, the cooling water is discharged, the air is cooled to the cooling means hot air and the second heat insulating hole, the core mold is released, the injection molding is taken out, and the heating core is preheated with a banding heater for the next process. Rapid heating cooling injection method characterized in that the process is carried out sequentially.

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