KR20150117921A

KR20150117921A - Injection molding apparatus

Info

Publication number: KR20150117921A
Application number: KR1020140043698A
Authority: KR
Inventors: 오세윤
Original assignee: 주식회사 엠피에이테크놀로지
Priority date: 2014-04-11
Filing date: 2014-04-11
Publication date: 2015-10-21

Abstract

The injection molding apparatus includes a first mold and a second mold that are combined with each other to form an injection cavity, a resin supply device that supplies the resin in a molten state into the injection cavity, and a miliphin insert formed in any one of the first and second molds. And a milipine which is inserted through the ball and serves to push the molded product. The space between the inner wall of the dipole insertion hole and the dipole is filled with silicone oil. By sealing the miliphin insertion hole with silicone oil and sealing the periphery of the miliphin and the milfin insertion hole, the pressure in the injection cavity is automatically increased by heating the air in the injection cavity by the molten resin introduced into the injection cavity, So that vaporization of moisture or impurities can be prevented.

Description

Injection molding apparatus

The present invention relates to an injection molding apparatus for molding a product by injection molding a resin.

In the injection molding apparatus in which the molten resin is injected into the injection cavity in the mold, when the resin in a molten state at a high temperature is injected into the mold, moisture remaining in the mold is vaporized and the resin flows and adheres to the mold There is a problem that the surface property of the molded product is deteriorated.

In order to solve such a problem, conventionally, a method of reducing moisture contained in a resin has been used. This method requires a separate process and equipment for drying the resin at a high temperature, resulting in an increase in mold production cost and power consumption There has been a problem of increasing the number of sheets.

In addition, since foreign materials or gas remain in the injection cavity due to repetitive molding operation, the mold needs to be cleaned, resulting in an increase in maintenance cost and a decrease in productivity.

Japanese Patent Application Laid-Open No. 10-2014-0000097 Patent Registration No. 10-1149492

The present invention provides an injection molding apparatus capable of raising the pressure in the injection cavity so as to prevent evaporation of moisture or impurities remaining in the injection cavity when the resin is introduced into the molten state.

An injection molding apparatus according to an embodiment of the present invention includes a first mold and a second mold which are combined with each other to form an injection cavity, a resin supply device that supplies a molten resin into the injection cavity, And a milin pin which is inserted through a milkypin insert hole formed in any one of them and pushes the molded product. The space between the inner wall of the dipole insertion hole and the dipole is filled with silicone oil.

The injection molding apparatus according to another embodiment of the present invention may further include a presser for supplying pressurized gas to pressurize the injection cavity.

The injection molding apparatus according to another embodiment of the present invention may further include an actuator for driving at least one of the first and second molds, and a controller for controlling the operation of the actuator and the presser. The controller may output a signal to output the signal to the actuator so that the first and second molds are brought into close contact with each other so as to form the injection cavity so that the pusher operates to press the injection cavity.

According to another aspect of the present invention, there is provided an injection molding apparatus including a first mold receiving a resin in a molten state, a second mold forming an injection cavity in combination with the first mold, an actuator driving the second mold, A pressurizer for supplying a pressurized gas for pressurizing the injection cavity, and a controller for controlling the actuator and the pressurizer. The controller outputs a signal for driving the second mold to be in close contact with the first mold to form the injection cavity, and then outputs a signal for causing the presser to operate to press the injection cavity based on the signal.

According to the present invention, by sealing the periphery of the miliphin insertion hole with the silicone oil filled in the miliphin insertion hole, the air in the injection cavity is heated by the molten resin introduced into the injection cavity to automatically increase the pressure, The pressure in the injection cavity can be raised to prevent vaporization of moisture or impurities.

Further, by providing a separate pressurizer, even when molding is performed with a resin having a relatively high melting point, it is possible to further increase the pressure in the injection cavity, thereby preventing vaporization of moisture and impurities.

Further, according to the present invention, by sensing the close contact of the two molds by using the drive control signal for driving the actuator for moving the mold, by driving the pusher, The pressure in the injection cavity can be increased.

1 is a schematic view of an injection molding apparatus according to an embodiment of the present invention.
2 is a block diagram of an injection molding apparatus according to an embodiment of the present invention.

Hereinafter, an injection molding apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of an injection molding apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of an injection molding apparatus according to an embodiment of the present invention.

Referring to FIG. 1, an injection molding apparatus according to an embodiment of the present invention includes a first mold 11 and a second mold 13 forming an injection cavity 10 in combination with each other. For example, when the first mold 11 and the second mold 13 are in close contact with each other as shown in FIG. 1, the injection cavity 10 may be formed therebetween.

The resin feeder 21 supplies molten resin into the injection cavity 10. For example, the resin feeder 21 can supply the resin 23 in a molten state through the resin inlet 14 formed in the first metal mold 11. [

After the injection molding is completed, a molding pin 31 is provided to push the molded product out of the mold. For example, the plurality of microneedles 31 may be provided, and the microneedles 31 may be installed with the microneedle insertion holes 16 formed in the second molds 13 inserted therein.

While the injection molding is proceeding, the end of the molding pin 31 is maintained in a state where it is not introduced into the injection cavity 10, and after the injection molding is performed, the molding product is driven in the direction of the molding product after solidification, Remove it from the mold. 1, the second mold 13 is separated from the first mold 11 after the injection molding is performed, and in this state, The molding material is separated from the second metal mold 13 while the microneedle 31 slightly moves rightward in Fig.

In the case where a plurality of the milling pins 31 are provided, a support block 33 on which a plurality of milling pins 31 are installed may be provided. The support block 33 and a plurality of the mil pins 31 provided thereon are moved together.

At this time, the space 16 between the inner wall 17 forming the milfin insertion hole 16 and the spin pin 31 is filled with the silicone oil 35. Silicone oil 35 may be silicone that retains its liquid oil form over a range of temperatures and may be a conventional silicone oil. For example, the silicone oil may be a silicone oil capable of maintaining a liquid phase up to about 90 ° C. Considering that the temperature of the liquid resin introduced into the injection cavity 10 during injection molding is usually around 200 to 300 ° C, when the temperature of the milfin insertion hole 16 is expected to be lower than about 80 ° C, The injection cavity 10 can be inserted into the space between the inner wall 17 and the inner surface of the inner wall 17 and the inner surface of the inner wall 17 to form the injection cavity 16, It is possible to prevent communication. The pressure inside the injection cavity 10 is automatically raised by the expansion of the gas in the injection cavity 10 due to the heating of the gas in the injection cavity 10 when the molten resin flows into the injection cavity 10 because the periphery of the mold cavity 31 is sealed, The pressure of the injection cavity 10 is increased, and moisture and liquid impurities existing in the injection cavity 10 are vaporized, thereby preventing the surface characteristics of the injection product from being deteriorated.

Meanwhile, the injection molding apparatus according to another embodiment of the present invention may further include a presser 50 for supplying pressurized gas to pressurize the injection cavity 10. By pressing the injection cavity 10 further through the pusher 50 in addition to sealing around the mold pin 31, even if injection molding is performed with a resin having a relatively high melting temperature, such as acrylic or polycarbonate (PC) The pressure of the cavity 10 can be further increased and vaporization of moisture or liquid impurities can be effectively prevented.

The pressurizer 50 may be connected to the injection cavity 10 through a gas supply passage 18 formed in the first mold 11 through a connection pipe 51. For example, the pressurizer 50 may be a compressor that supplies compressed air.

2, an actuator 60 for driving at least one of the first mold 11 and the second mold 13 may be provided. For example, the actuator 60 may be connected to the second mold 13 so as to move it. The actuator 60 may be embodied as a motor and a power transmitting member connected thereto.

The controller 70 controls the operation of the actuator 60 and the pusher 50. The controller 70 may include related hardware and software such as a microprocessor, a memory, and the like. The controller 70 may be connected to the actuator 60 and the pusher 50 to output a control signal for controlling the driving of the actuator 60 and the pusher 50.

According to the embodiment of the present invention, the controller 70 outputs a signal to the actuator 60 that the first and second molds 11 and 13 are in close contact with each other so as to form the ejection cavity 10, And to output to the pusher 50 a signal to operate to pressurize the injection cavity 10. For example, the controller 70 outputs a signal for driving the second mold 13 to closely contact the first mold 11 to form the injection cavity 10, and then, based on the signal, And to output a signal to operate to supply pressurized gas for pressurizing the cavity 10. [ Accordingly, there is no need for a separate sensor for sensing the close contact of the two molds 11 and 13 in order to determine the drive time point of the pressurizer 50, and it is possible to drive the pressurizer 50 at a more accurate point in time, An appropriate pressure rise in the pressure vessel 10 can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes and modifications to the scope of the invention.

11: First mold
13: second mold
14: Resin inlet
16: milipine insertion hole
21: Resin feeder
31: milifin
35: Silicone oil
50: Presser
60: Actuator
70: controller

Claims

A first mold and a second mold which are combined with each other to form an injection cavity,
A resin supply device for supplying molten resin into the injection cavity, and
And a micrindin inserted through the microneedle formed in any one of the first and second molds and serving to push the molded product,
Wherein a space between an inner wall of the insertion hole and the space is filled with silicone oil.

The method of claim 1,
And a pressurizer for supplying pressurized gas for pressurizing the injection cavity.

3. The method of claim 2,
An actuator for driving at least one of the first and second molds, and
Further comprising a controller for controlling the operation of the actuator and the pusher,
Wherein the controller outputs a signal to cause the presser to operate to press the injection cavity while outputting a signal to the actuator such that the first and second molds are brought into close contact with each other to form the injection cavity.

A first mold receiving molten resin,
A second mold combined with the first mold to form an injection cavity,
An actuator for driving the second mold, and
A pressurizer for supplying a pressurized gas for pressurizing the injection cavity, and a controller for controlling the actuator and the pressurizer,
Wherein the controller outputs a signal for driving the second mold to be in close contact with the first mold to form the injection cavity and then outputs a signal for actuating the pusher to press the injection cavity based on the signal, Molding device.