KR20150062195A - Pressurized Molding Machine For CFRP Product and Pressurized Molding Method Of CFRP Product - Google Patents

Pressurized Molding Machine For CFRP Product and Pressurized Molding Method Of CFRP Product Download PDF

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Publication number
KR20150062195A
KR20150062195A KR1020130146021A KR20130146021A KR20150062195A KR 20150062195 A KR20150062195 A KR 20150062195A KR 1020130146021 A KR1020130146021 A KR 1020130146021A KR 20130146021 A KR20130146021 A KR 20130146021A KR 20150062195 A KR20150062195 A KR 20150062195A
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KR
South Korea
Prior art keywords
mold
flexible vacuum
vacuum cover
resin
outside
Prior art date
Application number
KR1020130146021A
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Korean (ko)
Inventor
한규동
Original Assignee
(주)에이티씨
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Priority to KR1020130146021A priority Critical patent/KR20150062195A/en
Publication of KR20150062195A publication Critical patent/KR20150062195A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3607—Moulds for making articles of definite length, i.e. discrete articles with sealing means or the like
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/56—Compression moulding under special conditions, e.g. vacuum
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
    • B29C2043/3644—Vacuum bags; Details thereof, e.g. fixing or clamping
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/56—Compression moulding under special conditions, e.g. vacuum
    • B29C2043/561—Compression moulding under special conditions, e.g. vacuum under vacuum conditions

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The present invention relates to a method of manufacturing a carbon fiber-reinforced plastic by a resin transfer molding method, in which a content of a resin impregnated in a preform of a carbon fiber material is lowered by suppressing the generation of air bubbles, thereby producing a high- quality product in a short time The present invention relates to a carbon fiber-reinforced plastic press molding apparatus and a press molding method, which are capable of securing an airtight inner space. A flexible vacuum cover provided in the airtight inner space of the first mold and containing a preform, the shape of which changes according to the pressure inside and outside; A vacuum pump which penetrates the inside and the outside of the first mold and discharges the air inside the flexible vacuum cover to make it into a vacuum state; A resin supply device that penetrates the inside and the outside of the first mold and supplies the liquid resin to the inside of the flexible vacuum cover; And a pressurizing device for supplying compressed air of a predetermined pressure to the airtight inner space of the first mold to apply pressure to the flexible vacuum cover.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a carbon fiber-reinforced plastic pressure molding apparatus and a carbon fiber-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon fiber-reinforced plastic pressure-molding apparatus and a press-molding method, and more particularly, to a carbon fiber- To suppress the generation of air bubbles and to manufacture a high-quality product in a short time. BACKGROUND OF THE INVENTION

BACKGROUND OF THE INVENTION Fiber reinforced plastics (FRP), especially carbon fiber reinforced plastics (CFRP), are generally used in various industrial fields as lightweight composite materials having high mechanical properties. In recent years, carbon fiber reinforced plastics having very high strength and light weight have been developed and distributed in accordance with the trend of replacing the material of the vehicle body with the fiber-reinforced plastic material in order to increase the fuel efficiency of the automobile while maintaining the stability. As the demand gradually increases, it becomes necessary to develop devices and processes capable of mass production and efficient production of precise three-dimensional sheet-like products.

Conventionally, a HAND LAY UP method has been used to produce such a carbon fiber-reinforced plastic. This method involves placing a dry chopped strand mat on a half mold of the outer shape of the product, And then the resin is impregnated into the strand mat by using a roller, and the resin is hardened and molded. Such a hand layup process is a manual process, which involves quality problems such as durability and surface defects of the product, and causes a problem of increasing the cost of parts due to difficulty in mass production. Further, since the quality of the product depends on the skill level of the operator, it is difficult to obtain uniform quality and there is a limit in the production amount.

In order to solve these problems, Resin Transfer Molding (RTM) method is widely used to produce carbon fiber-reinforced plastic in recent years. In the resin transfer molding method, After placing the preformed article made of reinforcing fiber made of reinforced fiber composed of a fibrous fabric laminated base material or the like, the upper and lower molds are closed, the inside of the mold is depressurized, a liquid resin is injected using a resin injector or the like, A method for manufacturing a fiber-reinforced plastic.

However, the carbon fiber-reinforced plastic product manufactured by the resin transfer molding method has a problem in that it has a high resin content and thus has a low strength, and bubbles are generated in the manufacturing process, making it difficult to produce a high quality product.

On the other hand, another method of producing a carbon fiber-reinforced plastic is a method using a prepreg. The prepreg is a sheet-like intermediate material impregnated with various reinforcing fibers in advance, such as epoxy resin or polyester resin. Among the methods using such a prepreg, an autoclave molding method is typical. The prepreg is laminated in a mold with a plurality of plies, and then put into an autoclave device to package the surface of the product with a blank space, The gas pressure is applied from the outside and the vacuum state is maintained by the external vacuum pump in the inside to remove the volatile components generated in the resin impregnated into the prepreg so as to remove the gap between each layer of the prepreg, So that it can be used as a molding method.

However, such a molding method using a prepreg and an autoclave requires a very long time for the prepreg to harden in the autoclave, which is not suitable for mass production of the product, and since the autoclave device is very expensive, There was a problem that it rose.

Korean Patent Publication No. 10-2008-0011776 (published on Feb. 11, 2008)

A problem to be solved by the present invention is to provide a molding apparatus for producing a carbon fiber-reinforced plastic by a resin transfer molding method and a device for supplying a resin and a device for maintaining a vacuum in the mold, Which is capable of securing a very high strength by lowering the content of the resin contained in the final product and providing a high quality product in a short time, .

Another problem to be solved by the present invention is to provide a method of manufacturing a carbon fiber reinforced plastic by a resin transfer molding method in which a resin is sufficiently impregnated in a preform of a carbon fiber material while maintaining the inside of the mold in a vacuum state, A carbon fiber reinforced plastic which can manufacture a high-strength product with a low resin content in a short time by suppressing the external pressure to a predetermined pressure while maintaining the vacuum state, And to provide a press molding method.

A carbon fiber-reinforced plastic press forming apparatus for solving the above-mentioned problems includes: a first mold capable of securing an airtight inner space; A flexible vacuum cover provided in the airtight inner space of the first mold and containing a preform, the shape of which changes according to the pressure inside and outside; A vacuum pump which penetrates the inside and the outside of the first mold and discharges the air inside the flexible vacuum cover to make it into a vacuum state; A resin supply device that penetrates the inside and the outside of the first mold and supplies the liquid resin to the inside of the flexible vacuum cover; And a pressurizing device for supplying compressed air of a predetermined pressure to the airtight inner space of the first mold to apply pressure to the flexible vacuum cover.

At this time, the first mold includes a space portion formed in the inside of the first mold, the top surface of which is opened, and an opening formed in the space portion to prevent air from flowing to the inside and the outside of the first mold And a gas-tight cover.

On the other hand, the first metal mold includes a second metal mold including a space portion formed in the interior of the first metal mold and having an opened upper surface, the second metal mold being engaged with the space portion of the first metal mold, And a press to apply pressure to the second mold so that the second mold remains in an airtight state.

In addition, the pressurizing device continuously supplies compressed air of 6 to 10 atm into the airtight space of the first mold.

In order to solve the above-mentioned other problems, a carbon fiber-

a) injecting a preform into a flexible vacuum cover of a first mold;

b) securing airtightness to prevent air in the first mold from leaking to the outside;

c) actuating a vacuum pump in communication with the interior of the flexible vacuum cover to maintain the interior of the flexible vacuum cover in a vacuum state;

d) transferring the resin into the interior of the flexible vacuum cover to impregnate the preform;

e) continuously supplying compressed air to the space in which the airtightness of the first mold is ensured, thereby pressing the outside of the flexible vacuum cover;

f) curing the resin impregnated in the preform.

At this time, in the step b), the airtight cover is tightly coupled to the opening of the first mold to secure airtightness.

On the other hand, in the step b), the second mold is positioned on the opened top of the first mold, and then the second mold is pressurized by a press to secure airtightness.

In the step (e), compressed air of 6 to 10 atm is continuously supplied into the first mold to pressurize the pressurized air.

The present invention provides a flexible vacuum cover having a flexible vacuum cover inside a first mold which is completely sealed and hermetically sealed from the outside so as to impregnate a preform of a carbon fiber material with a resin and press the outside of the flexible vacuum cover By hardening the pre-formed article impregnated with the resin while pressurizing with the apparatus, it is possible to produce a high-strength article by lowering the content of the resin contained in the article.

According to the present invention, a preform is placed in a flexible vacuum cover provided in a first mold kept air-tight, the resin is impregnated in a vacuum state, and then the vacuum state is maintained. In addition, It is possible to produce a high-quality product in a short time by suppressing the generation of bubbles as much as possible.

1 is a conceptual diagram of a carbon fiber-reinforced plastic pressure molding apparatus according to a first embodiment of the present invention.
2 is a conceptual diagram of a carbon fiber-reinforced plastic pressure molding apparatus according to a second embodiment of the present invention.
3 is a flow chart of a method for pressurizing a carbon fiber-reinforced plastic according to an embodiment of the present invention.

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

1 is a conceptual diagram of a carbon fiber-reinforced plastic pressure molding apparatus according to a first embodiment of the present invention.

Referring to FIG. 1, a carbon fiber-reinforced plastic press forming apparatus 100 according to a first embodiment of the present invention includes a first mold 110 having a space portion 111 opened at an upper portion thereof, A flexible vacuum cover 150 provided in a space 111 in the first mold 110 and a hermetic cover 120 coupled to an opened upper portion of the space 111 in the first mold 110, .

The flexible vacuum cover 150 is connected to the vacuum pump 151 through a pipe passing through the first mold 110 and is also connected to the vacuum pump 151 through a pipe passing through the first mold 110. [ The gaseous vacuum cover 150 is also in communication with the resin supply device 160.

In addition, the internal space of the first mold 110 in which the flexible vacuum cover 150 is located is connected to the pressurizing device 170 through a pipe to supply compressed air of a predetermined pressure.

At this time, the high-pressure compressed air of about 6 to 10 atm supplied into the first mold 110 through the pressurizing device 170 is prevented from escaping into the upper opening of the first mold 110 120 are very tightly coupled to the first mold 110. In this case, The airtight cover 120 may be formed of a rigid material such as metal or the like so that the airtight cutter 120 is provided with a packing member or the airtight cover 120 is screwed to the first mold, You might think.

In addition, a plurality of pipes pass through the inside and the outside of the first mold 110 and the inside and outside of the airtight cover, and a gap is formed between the pipe and the first mold 110 to prevent the airtight state from being released Additional constructions such as packing members will also be necessary.

Meanwhile, the flexible vacuum cover 150 secures a space for accommodating the preform within it, and is not a fixed shape but a component deformed according to an internal or external condition. That is, when the liquid resin is supplied into the flexible vacuum cover 150 by the resin supply device 160, the volume of the resin is expanded, and the vacuum pump 151 is operated to move the flexible vacuum cover 150 Will be shrunk when the interior of the flexible vacuum cover 150 changes to a vacuum state and will also shrink when the pressure device 170 is actuated and pressure is applied from outside the flexible vacuum cover 150.

The flexible vacuum cover 150 is attached to the bottom surface of the space 111 of the first mold 110 as shown in the drawing, rather than being separated from the first mold 110 It is desirable that

Although not shown in the figure, a discharge path through which the liquid resin supplied into the flexible vacuum cover 150 escapes is formed in the first mold 110 or in the first mold 110 and the flexible vacuum cover 150. [ (Not shown).

FIG. 2 is a conceptual view of a carbon fiber-reinforced plastic pressure molding apparatus according to a second embodiment of the present invention.

Referring to FIG. 2, a carbon fiber-reinforced plastic press forming apparatus 100 according to a second embodiment of the present invention includes a first mold 110 having a space 111 opened at an upper portion thereof, A flexible vacuum cover 150 provided in the space 111 of the first mold 110 and a second mold 130 coupled to the opened upper portion of the space 111 in the first mold 110, ).

The flexible vacuum cover 150 is communicated with the vacuum pump 151 through a pipe passing through the first mold 110 as in the first embodiment, The flexible vacuum cover 150 communicates with the resin supply device 160 through a pipe and the space 111 of the first mold 110 in which the flexible vacuum cover 150 is located is provided with a second And is connected to the pressurizing device 170 through a pipe passing through the mold 130 to supply compressed air of a certain pressure.

At this time, in the second embodiment, high-pressure compressed air of about 6 to 10 atmospheres is supplied to the space 111 of the first mold 110 through the pressurizing device 170, And a press 140 for applying a predetermined pressure to the second mold 130 to prevent the compressed air from escaping through the joint between the first mold 130 and the second mold 130. In addition, It is also preferable that a packing member or a sealing member is further provided between the first mold 110 and the second mold 130 so as to reliably ensure a hermetic state.

Next, a carbon fiber-reinforced plastic pressure forming method according to an embodiment of the present invention will be described with reference to FIG.

First, after the preform 10 made of carbon fiber is inserted into the flexible vacuum cover 150 provided in the space 111 of the first mold 110, the flexible vacuum cover 150, . The inside of the flexible vacuum cover 150 is connected to the vacuum pump 151 and the resin supply unit 160 located outside the first mold 110 by using a pipe or the like. Of course, the pressurizing device 170 is also connected to the space 111 of the first mold 110 by a pipe or the like to complete all settings.

The upper surface of the space portion 11 of the first mold 110 is sealed to secure an airtight space in the first metal mold 110. In the first embodiment of the press molding apparatus 100, The hermetic cover 120 may be tightly coupled to the first mold 110. When the second mold 130 described in the second embodiment is used, The mold 110 and the second mold 130 may be combined and then pressed by the press 140.

When the apparatus is prepared as described above, the resin supply device 160 is operated to transfer the liquid resin into the flexible vacuum cover 150, and the vacuum pump 151 is operated to supply the flexible vacuum The inside of the cover 150 is converted into a vacuum state so that the preform 10 injected into the flexible vacuum cover 150 is sufficiently impregnated with the liquid resin.

After the liquid resin is sufficiently supplied into the flexible vacuum cover 150, the operation of the resin supply device 160 is stopped and the process proceeds to the curing step. In order to efficiently cure the resin, This may be additionally required.

In the curing step of the resin-impregnated preform 10, the pressurizing device is operated to press the outside of the flexible vacuum cover 150. The pressurized air is compressed to a pressure of about 6 to 10 atm And supplied to the space portion 111 of the mold 110 to press it.

By thus pressing the flexible vacuum cover 150 in the curing step, the content of the cured resin impregnated in the preform 10 can be lowered, the bubbles generated in the impregnation and curing process can be easily discharged, It is possible to increase the strength and quality of the product.

On the other hand, in the step of impregnating the preform 10 with the liquid resin and the step of pressing and curing, the extra liquid resin is discharged to the outside through the discharge passage provided in the first mold 110 .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art that various modifications, substitutions, and the like can be made without departing from the scope of the present invention.

10 - preform
100 - Press forming device
110 - first mold 111 - space part
120 - Airtight cover
130 - Second mold 140 - Press
150 - Flexible vacuum cover 151 - Vacuum pump
160 - Resin feeder 170 - Pressure device

Claims (8)

A first mold capable of securing an airtight inner space;
A flexible vacuum cover provided in the airtight inner space of the first mold and containing a preform, the shape of which changes according to the pressure inside and outside;
A vacuum pump which penetrates the inside and the outside of the first mold and discharges the air inside the flexible vacuum cover to make it into a vacuum state;
A resin supply device that penetrates the inside and the outside of the first mold and supplies the liquid resin to the inside of the flexible vacuum cover; And
And a pressurizing device for supplying compressed air of a predetermined pressure to the airtight inner space of the first mold to apply pressure to the flexible vacuum cover. The method according to claim 1,
Wherein the first mold comprises:
And a hermetic cover mounted on an opening of the space to prevent air from flowing to the inside and the outside of the first mold. Carbon fiber reinforced plastic press forming device. The method according to claim 1,
Wherein the first mold comprises:
And a space portion formed in the interior of the first mold and having an open upper surface,
A second mold coupled to the space portion of the first mold;
Further comprising a press for applying pressure to the second mold so that the first mold and the second mold are kept in an airtight state. The method according to any one of claims 1 to 3,
The pressure-
Wherein compressed air of 6 to 10 atmospheres is continuously supplied into the airtight space of the first metal mold. a) injecting a preform into a flexible vacuum cover of a first mold;
b) securing airtightness to prevent air in the first mold from leaking to the outside;
c) actuating a vacuum pump in communication with the interior of the flexible vacuum cover to maintain the interior of the flexible vacuum cover in a vacuum state;
d) transferring the resin into the interior of the flexible vacuum cover to impregnate the preform;
e) continuously supplying compressed air to the space in which the airtightness of the first mold is ensured, thereby pressing the outside of the flexible vacuum cover;
f) curing the resin impregnated in the preform. < RTI ID = 0.0 > 8. < / RTI > The method of claim 5,
The step b)
Wherein the airtight cover is tightly bonded to the opening of the first mold to ensure airtightness. The method of claim 5,
The step b)
Wherein the second mold is placed on the opened top of the first mold, and a pressure is applied to the second mold by a press to secure airtightness. The method according to any one of claims 5 to 7,
The step e)
Wherein pressurized air of 6 to 10 atmospheres is continuously supplied into the first metal mold to pressurize the carbon fiber-reinforced plastic.
KR1020130146021A 2013-11-28 2013-11-28 Pressurized Molding Machine For CFRP Product and Pressurized Molding Method Of CFRP Product KR20150062195A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017160030A1 (en) * 2016-03-17 2017-09-21 주식회사 엘지화학 Battery case manufacturing device having improved production processability and manufacturing method using same
KR102299790B1 (en) * 2021-01-27 2021-09-09 주식회사 이레이 Vacuum and preasure molding method for high voltage and high reliability power supply

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017160030A1 (en) * 2016-03-17 2017-09-21 주식회사 엘지화학 Battery case manufacturing device having improved production processability and manufacturing method using same
CN108136656A (en) * 2016-03-17 2018-06-08 株式会社Lg化学 With it is improved manufacture processing performance battery case manufacturing device and use its manufacturing method
CN108136656B (en) * 2016-03-17 2020-11-10 株式会社Lg化学 Manufacturing apparatus of battery case having improved manufacturing workability and manufacturing method using the same
US11305476B2 (en) 2016-03-17 2022-04-19 Lg Energy Solution, Ltd. Manufacturing device of battery case having improved manufacturing processability and manufacturing method using the same
KR102299790B1 (en) * 2021-01-27 2021-09-09 주식회사 이레이 Vacuum and preasure molding method for high voltage and high reliability power supply

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