KR101784358B1 - Vacuum and pressure control system for infection molding - Google Patents

Vacuum and pressure control system for infection molding Download PDF

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Publication number
KR101784358B1
KR101784358B1 KR1020150159818A KR20150159818A KR101784358B1 KR 101784358 B1 KR101784358 B1 KR 101784358B1 KR 1020150159818 A KR1020150159818 A KR 1020150159818A KR 20150159818 A KR20150159818 A KR 20150159818A KR 101784358 B1 KR101784358 B1 KR 101784358B1
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KR
South Korea
Prior art keywords
vacuum
mold
pressure
hole
pipe
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KR1020150159818A
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Korean (ko)
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KR20170056303A (en
Inventor
김지수
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주식회사 케이태우
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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
    • B29C45/1701—Component parts, details or accessories; Auxiliary operations using a particular environment during moulding, e.g. moisture-free or dust-free
    • 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
    • B29C45/26—Moulds
    • B29C45/2602—Mould construction elements
    • 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
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The present invention relates to a vacuum and pressurizing method for injection molding which enables a vacuum and pressurized environment to be selectively formed in a mold so as to prevent defects and quality deterioration due to vaporization of gas and moisture generated in a mold during production of a product through an injection molding apparatus, Control system.

Figure R1020150159818

Description

Technical Field [0001] The present invention relates to a vacuum and pressure control system for injection molding,

The present invention relates to a vacuum and pressurization control system, and more particularly, to a vacuum and pressurization control system for selectively controlling the vacuum and pressurization environment in a mold to prevent defects and quality deterioration due to vaporization of gas and moisture generated in a mold during production of a product through an injection molding apparatus. To a vacuum and pressure control system for injection molding.

Injection molding (injection molding) is a method of producing products from various resins as a raw material, and it is advantageous in mass production of products requiring high precision. Demand is continuously increasing with the development of mold technology.

Such injection molding comprises a step of heating a raw material to which a pigment, a stabilizer, a plasticizer, a filler, and the like are added to a synthetic resin in a molten state at a high temperature, injecting the resin into a mold through a cylinder and a screw, and then solidifying.

In this case, as the raw material is injected into the injection cavity at a relatively low temperature under atmospheric pressure through the plasticizing process at a high temperature, the moisture contained in the raw material is vaporized or gas is generated, which adversely affects the resin flow and mold adhesion, Etc., and the appearance defects of such articles are also influenced by post-processing painting, plating, coating, and deposition, thereby causing defective products.

There is a conventional technique for solving such a problem, for example, there is a method of sufficiently drying a resin used as a raw material before melting. However, since a separate device for drying the raw material must be provided, there is a disadvantage that the cost of the product is increased due to a high initial cost and an increase in power consumption and maintenance cost due to driving, and even if the raw material is dried, There is still a problem that the surface quality of the product is deteriorated due to the gas generated due to the characteristics of the chemical raw material as well as the vaporization in the inside of the male mold.

Korean Patent Laid-Open No. 10-2008-0020774 (published on Mar. 6, 2008)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing an injection-molded product in which a vacuum and a pressurized environment are selectively formed in a mold to produce vapor- And to provide a vacuum and pressurization control system for injection molding that allows gas to be discharged to obtain good surface quality.

In order to achieve the above-mentioned object, according to the present invention, there is provided a method of manufacturing a semiconductor device, including a first through-hole and a second through-hole for supplying a molten raw material to one side and forming an injection cavity by mutual coupling, A mold unit comprising a first mold and a second mold to be formed; A vacuum pressurizing unit comprising a compressor for producing compressed air, a storage tank for storing the produced compressed air, and a vacuum ejector operated by pneumatic pressure applied from the storage tank; A second pressurizing pipe connected to the first through hole on one side and a first vacuum pipe connected to the second through hole respectively and connected to the storage tank on the other side and a second pressurizing pipe connected to the vacuum ejector Wherein the first vacuum pipe and the second vacuum pipe are selectively connected to each other in accordance with a control signal, or the first vacuum pipe and the second vacuum pipe are communicated with each other; A control unit for controlling the compressor, the vacuum ejector and the switching valve unit in cooperation with a control system of the injection molding machine; .

A pressure sensing part formed on the first through hole or the second through hole to sense a pressure inside the injection cavity; and a controller for monitoring the sensing result of the pressure sensing part according to time, And an alarm unit for outputting an alarm signal.

The first pressurizing pipe and the second pressurizing pipe are automatically opened at a pressure higher than the set pressure so that the internal pressure of the compressor And a relief valve for discharging air.

The first pressurizing pipe and the first vacuum pipe may further include a check valve for controlling the air flow in one direction so as to pressurize the inside of the injection cavity or to form a vacuum.

The mold part may include a first sealing member formed on the first mold part and a second sealing member formed on the second mold part to seal the outside of the contact part between the first mold and the second mold.

By forming a vacuum in the injection cavity through injection molding according to the present invention, it is possible to observe the pressure and cooling effect together with the removal of foreign substances and residual gas, and pressurize the inside of the injection cavity constantly during the injection of the raw material, The surface quality of the product can be improved. In particular, by implementing these two functions as a single system, selective vacuum and pressurization can be achieved, thereby improving the quality of the injection-molded product and minimizing the defect rate while reducing the burden on the user.

1 is a cross-sectional view illustrating a structure of a mold according to a preferred embodiment of the present invention,
2 is a flow diagram illustrating the air flow according to a preferred embodiment of the present invention,
3 is a block diagram illustrating a configuration and a connection relationship according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vacuum and pressure control system for injection molding according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view illustrating a structure of a mold according to a preferred embodiment of the present invention. FIG. 2 is a flow diagram illustrating an air flow according to a preferred embodiment of the present invention. The main constituent of the present invention is basically divided into a mold part 110, a vacuum pressing part 120, a switching valve part 130 and a control part 140. As shown in FIG.

The mold unit 110 includes a first mold 111 and a second mold 113 which are coupled to each other in the injection molding apparatus to form the injection cavity 118.

At this time, a supply hole 115 for supplying the molten raw material to one side is formed so that the raw material can be filled in the injection cavity 118 while the injection cavity 118 is connected to the outside A first through hole 116 and a second through hole 117 for communicating with each other are formed. In a preferred embodiment of the present invention, a supply hole 115 is formed in the first metal mold 111, a second through hole 117 is formed in the first metal mold 111, a second through hole 117 is formed in the second metal mold 113, 1 through holes 116 are respectively formed.

A first through hole 116 for applying pressure inside the injection cavity 118 and a second through hole 117 for forming a vacuum inside the injection cavity 118 are formed at different positions. In the case of the second through hole 117 for vacuum, the first through hole 116 for pressurization is not limited in position, but the mold and the injection cavity 118 ), The installation point is determined.

In order to prevent the gist of the present invention from being blurred, the general construction of the injection molding apparatus is not specifically described, but in the conventional injection molding apparatus, the first mold 111 is fixed and the second mold 113 is movable And the molten resin is injected from the injection nozzle to form one and the other of the products.

In this case, the first mold 111 is injected into the hopper in a fixed state, and the molten resin is injected. The second mold 113 is movable in a horizontal direction within a predetermined interval, and the first mold 111 A cooling water passage for cooling and solidifying the resin injected into the injection cavity 118, and the like are formed.

In order to prevent air from leaking through the contact portions of the first mold 111 and the second mold 113 as the vacuum is selectively formed or pressurized in the injection cavity 118, So that the outside of the contact portions of the first mold 111 and the second mold 113 is enclosed.

The first sealing member 112 is formed along the outer edge of the first mold part 110 and the second sealing member 114 is formed along the outer edge of the second mold part 110. In this case, And the first sealing member 112 and the second sealing member 114 are engaged with each other so that the sealing of the injection cavity 118 is achieved.

At this time, the first sealing member 112 and the second sealing member 114 are formed of a double material, the portion contacting the mold side is formed of urethane material resistant to heat, and the first sealing member 112 and the second sealing member 114 (114) are formed of a silicon material, sealing performance and durability can be secured at the same time.

The vacuum pressurizing unit 120 is constituted to literally form a vacuum in the injection cavity 118 or pressurize the inside of the injection cavity 118 through compressed air and corresponds to a conventional air compressor for producing compressed air A storage tank 122 for storing the compressed air produced from the compressor 121 and a vacuum ejector 123 operated by pneumatic pressure applied from the storage tank 122 .

The vacuum ejector 123 is a substantial vacuum pump, and unlike the compressor 121 operated in a motor-operated manner, the vacuum ejector 123 is provided with a pneumatic motor as a power source to operate through compressed air discharged from the storage tank 122 A vacuum pump and a vacuum pump can be connected to each other through a single electric power system and a solenoid valve V opened and closed by a control signal is connected to a pipe connecting the storage tank 122 and the vacuum ejector 123, Is controlled.

At this time, there is a phenomenon that moisture in the air compressed air is condensed. Therefore, condensed water may exist in the discharge pipe of the compressor 121 and the storage tank 122, and this portion may be mixed with the compressed air, The vacuum pressurizing unit 120 may include a dryer 136 for removing moisture from the air discharged from the compressor 121 and the storage tank 122, ). At this time, the dryer (136) is operated by power and is filled with a dehumidifying agent for removing moisture, such as silica gel, not a mechanical system to which a refrigeration cycle principle is applied, so that no separate power is required for dehumidification / drying do.

The switching valve unit 130 is an electronic valve for connecting the vacuum pressurizing unit 120 and the mold unit 110 to selectively pressurize the inside of the injection cavity 118 or to form a vacuum, The first pressurizing pipe 131 connected to the hole 116 and the first vacuum pipe 132 connected to the second through hole 117 are connected to each other and the other end of the first pressurizing pipe 131 connected to the storage tank 122 A second pressurizing pipe 133 and a second vacuum pipe 134 connected to the vacuum ejector 123 are connected.

The compressed air can be selectively injected into the injection cavity 118 by connecting the first and second pressurization pipes 131 and 133 to the first vacuum pipe 132 and the second pressurization pipe 133, 2 vacuum conduit 134 to operate in accordance with an electronic control signal to form a vacuum inside the injection cavity 118.

The control unit 140 is basically a control panel for controlling the solenoid valve V including the compressor 121, the vacuum ejector 123 and the switching valve unit 130. In the present invention, the control unit 140 is interlocked with the control system of the injection molding machine And is programmed to control for vacuum or pressurization within the injection cavity 118 in accordance with the injection process.

If leakage of air occurs in any part of the process of vacuum or pressurization in the injection cavity 118 through the present invention, the present invention becomes virtually useless and excessive load of the vacuum pressurization unit 120 Lt; / RTI >

In particular, in the case of the mold part 110 having a closed structure according to the surface contact of the metal, there is a possibility of leakage of air. As mentioned above, the first and second sealing members 112 and 114 are provided, And it is very difficult for the manager to check if any unexpected leakage occurs during the pressing process.

To this end, the present invention includes a pressure sensing part 141 formed in the first through hole 116 or the second through hole 117 to sense the pressure inside the injection cavity 118 through an electronic sensor And a notification unit 142 for monitoring the detection result of the pressure sensing unit 141 according to a time flow to determine whether or not the leakage occurs, and outputting an alarm signal upon determining leakage. As a specific example of the method, by monitoring the pressure drop per hour or the pressure rising rate, it is possible to monitor the pressure increase rate in the vacuum state of the injection cavity 118, the pressure decrease rate in the state that the injection cavity 118 is pressurized, If the rate of change is equal to or higher than the set speed, it is determined that the air leaks somewhere, and the administrator can recognize the change through a means such as a warning light or a buzzer.

In addition, in order to prevent damage to the system due to excessive air pressure in the process of pressurizing the injection cavity 118, the first and second pressurizing pipes 131 and 133 are provided with an internal pressure equal to or higher than a set pressure And a relief valve 135 for automatically releasing the compressed air inside is installed. This may be an option considering the capacity of the compressor 121 and the maximum pressure. However, since excessive injection of excess injection pressure into the injection cavity 118 may adversely affect the injection process, So that the automatic pressure control is performed.

In addition, as the first pressurizing pipe 131 and the first vacuum pipe 132 are interlocked with the injection cavity 118, the backward flow of air may occur in the opposite side pipe according to the pressurization or vacuum process. To this end, in the present invention, a check is made to control the flow of air in the first and second vacuum pipes 131 and 132, respectively, And further includes a valve 137.

It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.

110: mold part 111: first mold
112: first sealing member 113: second mold
114: second sealing member 115: supply hole
116: first through hole 117: second through hole
118: Cavity 120: Vacuum pressing part
121: compressor 122: storage tank
123: Vacuum ejector 130:
131: first pressurizing pipe 132: first vacuum pipe
133: second pressure piping 134: second vacuum piping
135: relief valve 136: dryer
137: Check valve 140:
141: Pressure sensing unit 142:
V: Solenoid valve

Claims (5)

A first through hole 116 and a second through hole 116 are formed in the injection cavity 118. The first through hole 116 and the second through hole 116 communicate with the outside of the injection cavity 118, (110) comprising a first mold (111) and a second mold (113) in which a mold (117) is formed;
A vacuum pressurizing unit 122 composed of a compressor 121 for producing compressed air, a storage tank 122 for storing the produced compressed air, and a vacuum ejector 123 operated by pneumatic pressure applied from the storage tank 122 120);
The first pressurizing pipe 131 connected to the first through hole 116 and the first vacuum pipe 132 connected to the second through hole 117 are connected to one side and the storage tank And a second vacuum pipe 134 connected to the vacuum ejector 123 are connected to the first pressure pipe 131 and the second pressure pipe 132 selectively in accordance with a control signal, A switching valve portion 130 for communicating the two pressure piping 133 or for communicating the first vacuum piping 132 and the second vacuum piping 134;
A control unit 140 that controls the compressor 121, the vacuum ejector 123, the switching valve unit 130, and the solenoid valve V in cooperation with the control system of the injection molding machine; Wherein the vacuum and pressurization control system is for injection molding.
The method according to claim 1,
A pressure sensing part 141 formed on the first through hole 116 or the second through hole 117 for sensing a pressure inside the injection cavity 118 and a pressure sensor 141 for sensing the pressure sensing part 141 Further comprising a notifying unit (142) for monitoring according to a time flow to determine whether or not a leak has occurred, and outputting an alarm signal when the leakage is determined.
The method according to claim 1,
The vacuum pressurizing unit 120 further includes a dryer 136 for removing moisture in the air discharged from the compressor 121 and the storage tank 122,
Characterized in that the first pressurizing pipe (131) and the second pressurizing pipe (133) include a relief valve (135) for automatically opening the internal pressure at a predetermined pressure or higher to discharge the compressed air therein Vacuum and pressure control systems.
The method according to claim 1,
The first pressurizing pipe 131 and the first vacuum pipe 132 may further include a check valve 137 for controlling the air flow in one direction so as to pressurize or vacuum the inside of the injection cavity 118 Characterized by a vacuum and pressure control system for injection molding.
The method according to claim 1,
The mold part 110 is provided with a first sealing member 112 formed on the first mold part 110 and a second sealing part 112 formed on the second mold part 110 to seal the outside of the contact part between the first mold 111 and the second mold 113, And a second sealing member (114) formed on the portion (110).
KR1020150159818A 2015-11-13 2015-11-13 Vacuum and pressure control system for infection molding KR101784358B1 (en)

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KR101784358B1 true KR101784358B1 (en) 2017-10-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102103202B1 (en) * 2019-06-07 2020-04-22 윤예성 air and gas exhaust test equipment of injection mold
KR102147662B1 (en) * 2020-04-14 2020-08-25 윤예성 air and gas exhaust test equipment of injection mold

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009248510A (en) 2008-04-09 2009-10-29 Toyota Motor Corp Method of monitoring resin molding
KR101038049B1 (en) 2009-12-31 2011-06-01 주식회사 유니솔루션플러스 Apparatus for pressure control in mold for resin injection molding
KR101149492B1 (en) 2011-05-17 2012-05-24 주식회사 유니솔루션플러스 Apparatus for resin injection molding
KR101423130B1 (en) 2012-06-22 2014-07-31 주식회사 엠피에이테크놀로지 Apparatus of vacuum injection molding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009248510A (en) 2008-04-09 2009-10-29 Toyota Motor Corp Method of monitoring resin molding
KR101038049B1 (en) 2009-12-31 2011-06-01 주식회사 유니솔루션플러스 Apparatus for pressure control in mold for resin injection molding
KR101149492B1 (en) 2011-05-17 2012-05-24 주식회사 유니솔루션플러스 Apparatus for resin injection molding
KR101423130B1 (en) 2012-06-22 2014-07-31 주식회사 엠피에이테크놀로지 Apparatus of vacuum injection molding

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