WO2013154263A1

WO2013154263A1 - Apparatus and method for removing residue from injection molds

Info

Publication number: WO2013154263A1
Application number: PCT/KR2013/001143
Authority: WO
Inventors: 박홍규; 박대규
Original assignee: Park Honggyu; Park Daegyu
Priority date: 2012-04-12
Filing date: 2013-02-14
Publication date: 2013-10-17
Also published as: KR101351702B1; KR20130115555A

Abstract

The present invention relates to an apparatus and method for removing residue from injection molds and, particularly, to an apparatus and method for residue from injection molds which can maintain a vacuum in a mold and remove the residue remaining after injection molding by spraying high-pressure air and cleaning out the residual debris inside the mold when the mold is opened after the residual air has been exhausted from the cavity, spool, and runner within the mold.

Description

Equipment and method for removing residue of injection mold

The present invention relates to an apparatus and a method for removing the residue of an injection mold, and in particular, in order to increase the injection moldability of a molding resin having a thin thickness, after degassing residual air in the cavity, the spool, and the runner in the mold, the mold is opened under high pressure. The present invention relates to a method for removing residues of an injection mold, which can clean residual residues in a mold by removing air, thereby removing vacuum residues in the mold and residues after injection, thereby improving injection moldability.

In general, degassing is one of the key factors in producing high-quality products in molding technology. Especially, in order to achieve ideal molding, air remaining in the mold (spool, runner, cavity) is obstructed. It is then important to ensure that the gases from the material can be properly discharged out of the mold.

Therefore, in the conventional injection molding of small precision parts, spools and runners may be much larger than products in mold manufacturing, in which case mold closing, mold tightening, nozzle touch, injection, holding pressure, cooling, plasticization, nozzle retraction, and mold opening In addition, when the resin is injected after the mold closing during the actual injection molding cycle, the residual air, which is much larger than the cavity, is pushed into the cavity, thereby preventing injection filling of the molding material.

This conventional problem is to properly discharge the residual air to the gap between the ejector pin or the Z pin clearance, the gap between the core and the core, the vent installed in the putting line by installing an air passage to let the air out of the mold. The above molding may enable the production of a good product by a simple substitution of air and resin.

However, in actual injection molding, not only the injection time is very short, but also the hot gas emitted from the resin when the resin is injected from the nozzle into the mold enters the cavity, and the mold structure is a resin in the case of a pin point gate or a submarine gate. More gas is generated when the resin temperature rises 25-30 ° C. as it passes.

This, in turn, causes gas defects, unmolding, poor abrasion, weld lines, bubbles, and the like, and may cause distortions because unnecessary stress is applied. In addition, with the development of new materials, the practical use of thin-walled molding and encapsulation has progressed, and in particular, when manufacturing a thin-walled molding resin, it is not possible to actively cope with the method of installing air passages as described above. This deteriorating problem is exposed.

Therefore, in order to solve the above problems, there has been proposed a mold apparatus for filling resin in a state in which there is no resistance by making the mold in a vacuum state to facilitate injection after degassing residual air in the mold. Residue of resin, etc. may be sucked into the intake passage of air and remain during the inhalation of air, and thus, a cleaning time is required, which increases work time, increases in defective products, and deteriorates productivity.

Therefore, the present invention has been made to solve the conventional problems as described above, the object of the present invention is to detect the opening and closing of the mold to increase the injection moldability of the molding resin of a thin thickness to degas the residual air in the mold or high pressure The present invention provides a method and a method for removing the residue of an injection mold by spraying air to remove the residue of the resin remaining in the mold, thereby cleaning both the residual air and the residue.

The present invention includes the following examples in order to achieve the above object.

A first embodiment of the present invention is formed with a core in which a liquid resin is injected in the center portion, the upper mold is lowered from the upper side to the lower mold for injection molding the resin is converted into an open or closed closed state; A connection pipe connected to a lower core hole extending downward from the core to extend outward to suck air in the core or deliver compressed air; And detecting a closed state in which the upper portion of the lower mold is sealed through the connecting tube, sucking the inner air of the core through the connecting tube, and making a vacuum state, and detecting an open state in which the upper portion of the lower mold is opened. It is preferable to include a degassing member for supplying high-pressure air through the connecting pipe to remove the residue of the resin remaining on the upper surface of the core.

In the second embodiment of the present invention, the degassing member includes a vacuum pump for sucking air remaining on the upper portion of the core through the connecting pipe; An air pump for injecting high pressure air into the upper portion of the core through the connecting pipe; Sensor unit for detecting the closed and open state of the lower mold; A control unit which receives the closing detection signal of the sensor unit to drive the vacuum pump, and receives the opening detection signal to control the air pump; And a valve control unit for selectively opening and closing a pipe line connecting the vacuum pump and the air pump to each of the connection pipes under the control of the controller.

In a third embodiment of the present invention, the degassing member further includes a display unit for displaying the open and closed states of the lower mold by at least one of a text, light emission, and an acoustic signal, wherein the display unit is one of a display, a warning light, and a buzzer. It is preferable to include the above.

A fourth embodiment of the present invention is a standby step of injecting a liquid resin into the core of the lower mold of the upper opening; A closed state determining step of determining whether an upper portion of the lower mold is in a closed state after the waiting step; If the lower mold is in a closed state in the closing determination step, the vacuum pump driving step of driving a vacuum pump to suck the air remaining in the lower mold to make a vacuum state; An open state determining step of determining whether an upper state of the lower mold is opened after the vacuum pump step; And if the upper portion of the lower mold is opened in the open state determination step, it is preferable to include an air pump driving step of driving the air pump to inject high-pressure air to the upper surface of the lower mold to remove the residual resin residue Do.

In the fifth embodiment of the present invention, the vacuum pump driving step of the lower mold by opening the pipe connected to the tube and the tube extending outward from the lower core hole extending from the upper surface of the lower mold to the lower mold Inhale air remaining on the upper surface of the.

In the sixth embodiment of the present invention, the air pump driving step detects that the upper part of the vacuum pump is open, the connection tube and the air extending outward from the lower core hole extending downward from the upper surface of the lower mold Opening the pipe connected to the pump is characterized in that the high-pressure air generated in the air pump is injected to the upper surface of the lower mold.

In the seventh embodiment of the present invention, the method of removing the residue of the injection mold in the vacuum pump driving step and the air pump driving step of the open and closed state of the lower mold, respectively, at least one of different characters, light emission and sound signals It is characterized by displaying.

The present invention can detect the opening of the mold to suck the air in the mold to maintain a vacuum state has the effect of improving the injection moldability by the high degree of completeness of the appearance of the molding resin of a thin thickness.

In addition, the present invention can detect the opening and closing of the mold to be sequentially injected with vacuum and air to prevent the occurrence of defective products due to residual air or residues of resin remaining in the mold, and separate cleaning time Since it is not necessary, the working time is shortened, thereby improving the productivity.

1 is a perspective view showing a lower mold in the residue removal device of the injection mold according to the present invention,

Figure 2 is a cross-sectional view showing a lower mold in the residue removal device of the injection mold according to the present invention,

Figure 3 is a block diagram showing the residue removal device of the injection mold according to the present invention,

Figure 4 is a flow chart illustrating a method of removing the residue of the injection mold according to the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the residue removal apparatus and method of the injection mold according to the present invention will be described in detail.

1 is a perspective view briefly showing the lower mold in the apparatus and method for removing the residue of the injection mold according to the present invention, Figure 2 is a cross-sectional view showing the lower mold 10 in the apparatus and method for removing the residue of the injection mold according to the present invention. .

1 and 2, the apparatus and method for removing the residue of the injection mold according to the present invention is the lower mold 10 and the high pressure air in the lower mold 10, the molding resin is injected into the electrical and electronic related products And a degassing member 20 for injecting or sucking the vacuum and cleaning the lower mold 10, and a connection pipe 30 connected between the degassing member 20 and the lower mold 10. .

The lower mold 10 has a core 11 in which a liquid molding resin is injected into a central portion thereof, and an upper mold (not shown) is lowered from the top to seal the illustrated mold. Such driving and operation of the upper mold is omitted in the drawings and detailed description as it is a general content. In addition, the upper mold is seated close to the upper portion of the lower mold 10 shown, the upper mold seated on the upper portion of the lower mold 10 is lifted to define a state in which the upper portion of the lower mold is opened.

In the closed state, a liquid resin is injected into the core 11 engraved from the upper surface of the lower mold, and the upper mold is moved from the upper side to seal the upper side of the core 11 or the lower mold 10. .

In addition, the open state is a state in which the upper mold is moved upwards as the liquid resin injected in the closed state of the upper mold is molded into a solid by heat transferred by the lower mold, so that the upper part of the core 11 is opened. to be.

As the upper side of the lower mold 10 is opened and closed as described above, the degassing member 20 injects high-pressure air to remove debris of resin remaining in the core 11 of the lower mold 10 or vacuum. Maintaining the state allows injection molding so that the liquid resin does not contain bubbles.

First, the lower mold 10 has a lower core hole 12 extending to the lower side of the core 11, and the core lower hole 12 poses inhalation of the upper air and injects high-pressure air into the lower hole 12. 12 is formed.

The lower core hole 12 is a hole extending downward from the core 11 and the porcelain 12 is seated.

The porcelain 12 is seated in the lower core hole 12, the upper side is exposed to the upper surface of the core 11 to suck air in the closed state of the core 11, the core 11 is opened In the state of spraying the high pressure air supplied from the degassing member (20). At this time, the porcelain 12 is sealed so that the upper end to suck the surrounding air, the outer surface extending downward from the upper end is formed so that the intake and injection of air is made. Such a configuration is generally known to those in the industry as a general content, and thus, the detailed description of the detailed configuration of the porcelain 12 has been omitted.

The degassing member 20 detects that the core 11 is in an open state through the connecting pipe 30 to inject high-pressure air to remove residues of resin remaining around the core 11, and the core Sensing that 11 is closed, air is sucked to control the upper space of the core 11 to achieve a vacuum state.

The degassing member 20 will be described with reference to FIG. 3.

3 is a block diagram showing the degassing member 20 in the residue removal device of the injection mold according to the present invention.

Referring to FIG. 3, the degassing member 20 sucks air from the core 11 through the valve control unit 23 and the connection pipe 30, which opens and closes a pipe connected to the connection pipe 30. Vacuum pump 21 to maintain a vacuum state, the air pump 22 for injecting high pressure air through the connecting pipe 30, the sensor unit for detecting the opening or soaking of the upper part of the core 11 ( 26, a control unit 24 controlling the air pump 22, the vacuum pump 21, and the valve control unit 23 according to the detection signal of the sensor unit 26, the air pump 22 and the vacuum. And a display unit 25 for displaying the driving state of the pump 21.

The valve control unit 23 switches the valve for opening and closing the pipe connected to the connecting pipe 30 in the air pump 22 and the vacuum pump 21 in the connecting pipe 30 to the air pump ( 22) or selectively opens and closes the conduit connected to the vacuum pump 21 in the connecting pipe (30).

Here, the valve connected to the connection pipe 30 is not shown in the drawing, in order to inject air of the vacuum pump 21 and high pressure air of the air pump 22 through the connection pipe 30. It is natural that the selective opening and closing of the pipe connected to the connection pipe 30 is made.

The sensor unit 26 detects that the upper part of the lower mold 10, that is, the upper part of the core 11 is sealed or opened, and transmits a detection signal to the control unit 24. More specifically, the sensor unit 26 detects that the upper mold is seated on the upper surface of the lower mold 10 and applies it to the controller 24. For example, the sensor unit 26 is composed of an optical sensor in which the light emitting device is installed in the lower mold 10 and the light receiving device in the upper mold, so that the upper mold is seated on the upper surface of the lower mold 10. In this case, the light emitting receiver and the light receiving element may receive an optical signal to detect the closing of the lower mold 10. Alternatively, the sensor unit 26 transmits an open detection signal to the controller 24 when the light emitted from the light emitting element is received by the light receiving element and the incident light signal is not received.

The control unit 24 receives the detection signal of the sensor unit 26 to control the air pump 22, the vacuum pump 21, and the valve control unit 23. That is, the control unit 24 controls the valve control unit 23 when the open detection signal is received from the sensor unit 26 and connects the conduit connected to the connection pipe 30 with the air pump 22. The high pressure air is injected into the lower mold 10 by driving the air pump 22.

Alternatively, when the closing signal is received from the sensor unit 26, the control unit 24 controls the valve adjusting unit 23 to open a conduit to which the vacuum pump 21 is connected, and the vacuum pump 21. It is driven to suck the air in the upper portion of the core 11 to maintain a vacuum state.

More preferably, the controller 24 controls the display unit 25 to visually or audibly display the driving of the vacuum pump 21 or the driving of the air pump 22. The display unit 25 may be one or more of a buzzer that displays an open or closed state as a luminous signal having a different color, a display for displaying an open and closed state as a character, and a warning sound having different voice signals. May be included.

When the vacuum pump 21 is turned on under the control of the controller 24, the vacuum pump 21 sucks air from the upper side of the core 11 through the connecting pipe 30 to maintain a vacuum state.

When the air pump 22 is turned on by the control of the controller 24, the air pump 22 blows high pressure air through the connecting pipe 30 to clean up the residue of the resin remaining in the core 11.

The configuration of the present invention is as described above, the following will be described in detail with reference to the flow chart of Figure 4 attached to the operation of the present invention achieved by the configuration as described above.

4 is a flowchart illustrating a method of controlling the lower mold 10 according to the present invention.

Referring to Figure 4, the lower mold 10 control method according to the present invention is a standby step (S11), the closed determination step (S12) for determining whether the closed state that the lower mold 10 is closed, and the closed If it is determined that it is closed in the determination step (S12), the vacuum pump driving step (S13) for sucking air by driving the vacuum pump 21, and the open judgment to determine whether the open state after the vacuum pump driving step (S13) Step S14 and, if it is determined that the open state in the opening determination step (S14) to drive the air pump 22 to drive the air pump for cleaning by spraying high-pressure air to the core 11 of the lower mold 10 Step S15 is included.

The standby step (S11) is heated to a predetermined temperature or more in the state that the lower mold 10 is open, and is a state before the resin is injected.

The closing determination step S12 is a step of determining whether the lower mold 10 is in the closed state by receiving the detection signal of the sensor unit 26 from the control unit 24.

In this case, the sensor unit 26 may detect a position and an operation state between the upper mold and the lower mold 10 to detect that the upper portion of the lower mold is open or closed.

The vacuum pump 21 driving step is a step of driving the vacuum pump 21 in the control unit 24 when the lower mold 10 is in the closed state in the closing determination step. Here, the control unit 24 controls the valve control unit 23 to open a conduit connecting the vacuum pump 21 and the connection pipe 30 and drive control the vacuum pump 21.

Therefore, the lower mold 10 may be in a vacuum state by discharging the air remaining inside the drive by the vacuum pump 21.

The controller 24 drives the vacuum pump 21 and simultaneously controls the display unit 25 to display a driving state of the vacuum pump 21. In this case, the display unit 25 may display a driving state of the vacuum pump 21 through at least one of a display, a warning light, and a buzzer.

The opening determination step (S14) is a step of determining whether the upper mold is lifted by the controller 24 to open the upper portion of the lower mold 10. The control unit 24 detects the driving state and position of the upper mold from the sensor unit 26 after the driving step (S13) of the vacuum pump 21 determines that the upper portion of the lower mold 10 is opened. do.

The air pump 22 driving step (S15) is the upper mold is driven in the opening determination step (S14), when it is detected that the upper portion of the lower mold 10 is opened to drive the air pump 22 to the lower It is a step of removing the residue of the resin remaining in the core 11 of the mold (10).

At this time, the liquid resin injected into the lower mold 10 is molded by the high temperature transmitted through the lower mold 10. In addition, when the set molding time of the liquid resin has elapsed, the upper portion of the lower mold is opened to take out the molded resin.

However, the core 11 of the lower mold 10 is often drawn out after the resin is molded as described above, the residue of the resin often occurs. Therefore, in the air pump driving step is to remove the remaining debris by injecting a high-pressure air from the upper surface of the lower mold.

Specifically, the control unit 24 detects that the upper portion of the lower mold 10 is opened in the sensor unit 26 in the opening plate step (S14), the valve control unit 23 and the air pump (22) is driven to remove the residue of the resin remaining in the lower mold (10).

The control unit 24 controls the valve control unit 23 to open a conduit to which the connecting pipe 30 and the air pump 22 are connected, and the connecting pipe 30 and the vacuum pump 21. Control to block the pipeline connected to the The control unit 24 drives the air pump 22 to inject high pressure air into the upper portion of the core 11.

In this case, since the upper end of the porcelain 12 exposed to the upper part of the core 11 is closed and the side is opened, the air of the high pressure in the air pump 22 is formed through the opening formed in the side of the porcelain. Squirt. Therefore, since the high-pressure air is injected in the horizontal direction from the upper surface of the core 11, all the residues remaining on the upper surface of the core 11 can be blown off.

In addition, the control unit 24 may drive the display unit 25 to display the driving state of the air pump 22. At this time, the display unit 25 is one or more of a display, a buzzer, a beacon, and displays the open state of the lower mold as one of a beacon and a different voice signal different from the closed state.

As described above, the present invention detects the closing and opening states of the vacuum to maintain the vacuum state before the resin is injected or at the same time as the resin is injected, thereby improving the completeness of the appearance of the molded resin having a thin thickness. After the operation is completed, the high-pressure air is injected through the air intake connector, thereby removing the resin residues remaining in the mold and the air intake connector. In addition, since the present invention maintains and cleans the vacuum sequentially, the manufacturing cycle of the injection is shorter, the defect rate due to air in the manufacturing process can be reduced, and the cleaning time can be saved, thereby improving the reliability and productivity of the product. do.

Although the present invention has been described in detail with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and variations belong to the appended claims.

Claims

A lower mold for forming a core in which a liquid resin is injected into a central portion thereof, the upper mold being lifted up and down at an upper side thereof, and being converted into an open or closed closed state to inject a resin;

A connection pipe connected to a lower core hole extending downward from the core to extend outward to suck air in the core or deliver compressed air; And

Detects a closed state in which the upper portion of the lower mold is sealed through the connecting tube, sucks the inner air of the core through the connecting tube to make a vacuum state, and detects an open state in which the upper portion of the lower mold is opened. The debris removal device of the injection mold comprising a degassing member for supplying high-pressure air through a connecting pipe to remove the residue of the resin remaining on the upper surface of the core.
The method of claim 1, wherein the degassing member

A vacuum pump for sucking air remaining in the upper portion of the core through the connecting pipe;

An air pump for injecting high pressure air into the upper portion of the core through the connecting pipe;

Sensor unit for detecting the closed and open state of the lower mold;

A control unit which receives the closing detection signal of the sensor unit to drive the vacuum pump, and receives the opening detection signal to control the air pump; And

The dreg removal apparatus of the injection mold including a valve control unit for selectively opening and closing the conduits connecting the vacuum pump and the air pump in the connecting pipe, respectively, under the control of the controller.
The degassing member according to claim 1 or 2, wherein

Further comprising a display unit for displaying the open and closed state of the lower mold to at least one of a text, light emission and sound signal,

The display unit of the injection mold debris removal device comprising at least one of a display, a warning light and a buzzer.
A closed state determination step of determining whether the upper mold is lowered from the upper side of the lower mold with the upper portion opened and closed;

If the lower mold is in a closed state in the closing determination step, the vacuum pump driving step of driving a vacuum pump to suck the air remaining in the lower mold to make a vacuum state;

An open state determining step of determining whether an upper state of the lower mold is opened after the vacuum pump step;

If the upper part of the lower mold is opened in the open state determination step, the injection pump including the air pump driving step of driving the air pump to inject high-pressure air to the upper surface of the lower mold to remove the residual resin residue How to remove dregs.
The method of claim 4, wherein the vacuum pump driving step

The injection mold, characterized in that to suck the air remaining on the upper surface of the lower mold by opening the pipe connected to the vacuum pipe and the connection pipe extending outward from the lower core hole extending from the upper surface of the lower mold How to remove dregs.
The method of claim 4, wherein the air pump driving step

The high pressure air generated in the air pump is detected by opening the pipe connected to the air pump and the pipe extending outward from the lower core hole extending downward from the upper surface of the lower mold by detecting the opening of the upper portion of the vacuum pump. How to remove the residue of the injection mold to be sprayed to the upper surface of the lower mold.
According to claim 4, The method of removing the residue of the injection mold

In the vacuum pump driving step and the air pump driving step

Removing the residue of the injection mold, characterized in that for displaying the open and closed state of the lower mold in at least one of a different character, light emission and sound signal.