KR102220747B1 - Molding apparatus for composite material - Google Patents

Abstract

The present invention relates to a molding apparatus of a composite material. In a single mold consisting of a lower mold and an upper mold, hot and cold blocks having a medium oil chamber are configured in the lower and upper molds, respectively, and thus hot deformation using thermal medium oil supplied to each medium oil chamber and high frequency induction heating by a heating cartridge, and a cooling process using refrigerant oil supplied to each medium oil chamber are performed in one process.

Description

Molding apparatus for composite material

The present invention relates to a molding apparatus for a composite material, and more particularly, by applying a cooling block having a medium oil chamber to a single mold consisting of a lower mold and an upper mold, the heat medium oil and the coolant oil supplied to the medium oil chamber are used. Thus, it relates to a molding apparatus for a composite material that enables the hot forming process and the cooling process to proceed in one process.

According to the recent trend of high-strength and lightweight materials throughout the industry, a case of applying fiber composite materials made of fiber reinforced plastics (FRP: Fiber Reinforced Plastics, hereinafter referred to as FRP) as well as high-strength metal materials or lightweight non-ferrous metal materials. It became frequent.

In particular, fiber composite materials are generally provided in the form of a prepreg in which a liquid synthetic resin is penetrated into a fiber reinforcement material, and when heat and pressure are applied within the mold, it has excellent mechanical and thermal properties, making it a high-strength lightweight composite part. It is suitable for production.

Since these fiber composite materials are excellent in strength, elastic modulus, light weight, and stability, they are in the spotlight as one of the major materials in industries that require high performance, and if economic conditions are resolved, their usage is expected to increase dramatically in the future. do.

The fiber reinforcement material used as a raw material for the fiber composite material is mainly aramid fiber fiber represented by glass fiber, carbon fiber, and Kevlar, and boron with low frequency of use. Ceramic fibers such as boron fibers and silicon carbide are also used.

Liquid synthetic resin that penetrates into such fiber reinforcement and is used as a matrix material is generally epoxy resin, unsaturated polyester resin, and phenol resin and polyimide resin for high temperature use. Thermosetting resins such as (polyimide resin) are used, and in recent years, thermoplastic resins are also used.

In this way, fiber composite materials having high strength and stiffness, as well as lightweight material characteristics by efficient combination of materials, are replacing the existing materials by effectively utilizing the properties. Aerospace, automobiles, sports, industrial machinery , Medical devices, military supplies, construction and civil engineering materials.

On the other hand, the method of molding various fiber composite materials is also made variously according to the characteristics of the material.It is a method of molding fiber composite materials based on polymer materials, such as autoclave molding and vacuum bag molding. ), Compression Molding, Filament Winding, SMC Molding Method (Sheet Molding Compound) or BMC Molding Method (Bulk Molding Compound), RTM Molding Method (Resin Transfer Molding), Pultrusion, Heat Press Molding Method, etc. There is this.

The use of such fiber composite materials is gradually increasing throughout the industry, but research on molding devices to implement various molding methods according to the properties of materials is poor. In particular, in the case of thermosetting fiber composite materials, in the mold After forming in a hot state, it must be cooled to room temperature again in the mold to prevent deformation and distortion of the molded part.In the past, such hot forming and cooling are carried out in different molds to move the molded parts between molds, Parts are deformed or warped, which caused product defects, and the process cycle time was prolonged.

The matters described in the background section as described above are prepared to enhance an understanding of the background of the invention, and may include matters other than the prior art already known to those of ordinary skill in the field to which this technology belongs.

In an embodiment of the present invention, in one mold consisting of a lower mold and an upper mold, a cooling block having a medium oil chamber is configured in the lower mold and the upper mold, respectively, and high frequency induction heating by the heat medium oil and the heating cartridge supplied to each medium oil chamber It is an object of the present invention to provide a molding apparatus of a composite material that enables hot forming using a method and a cooling process using refrigerant oil supplied to each of the medium oil chambers in one process.

In one or more embodiments of the present invention, in the composite material molding apparatus for press-molding a thermosetting composite material injected between a lower mold and an upper mold having a product molding surface therein, it is fastened to the lower surface of the lower mold, and the heat medium therein A lower cold/hot block having a medium oil chamber filled with oil or refrigerant oil supplied; An upper cold and hot block fastened to the upper surface of the upper mold and having a medium oil chamber filled with heat medium oil or coolant oil therein; A plurality of heating cartridges installed in respective medium oil chambers of the lower and upper cooling and heating blocks to heat the heat medium oil filled in each medium oil chamber by high frequency induction heating; A plurality of temperature sensors installed inside the lower and upper molds to detect temperatures of the lower and upper molds, respectively; The heat medium oil is heated and stored at a certain temperature, and the heat medium oil is pumped and supplied by being connected to the medium oil chambers of the lower and upper cooling and heating blocks through the first and second supply lines and the first and second recovery lines. A heating tank to recover or recover; The refrigerant body oil is cooled to a certain temperature and stored, and the refrigerant body oil is pumped by being connected to the medium oil chambers of the lower and upper cooling and heating blocks through the first and third supply lines and the first and third recovery lines. A cooling tank for supplying or recovering; A first control valve connecting the first, second, and third supply lines to selectively connect the first supply line to the second supply line or the third supply line according to a control signal; A second control valve connecting the first, second, and third recovery lines to selectively connect the first recovery line to the second recovery line or the third recovery line according to a control signal; The plurality of heating cartridges, the plurality of temperature sensors, and the first and second control valves are electrically connected to control power of the heating cartridge, receive a detection signal from the temperature sensor, and compare and determine a reference value. , An apparatus for molding a composite material including a controller for controlling the output of control signals of the first and second control valves may be provided.

Each of the lower and upper cooling and heating blocks may include a block body in which a medium oil chamber is formed, and a block cover that is fastened to the block body to seal the medium oil chamber.

In addition, between the block body and the block cover, a seal is inserted into a ring groove formed on the circumferential surface of the medium oil chamber on the block body, and is press-fitted by the block cover to maintain airtightness of the medium oil chamber. I can.

The lower and upper cooling and heating blocks form the inside of each medium oil chamber as a medium oil passage in one direction partitioned by a partition wall, and may include a suction port formed at one side and a discharge port formed at the other side.

In addition, the heating cartridge may be inserted through the side surfaces of each block body of the lower and upper cooling and heating blocks and disposed side by side on the medium oil passage.

In addition, the heating tank is configured with a heating coil inside to heat the heating medium oil to a certain temperature, and pumping the internal heating medium oil at one side of the upper side, and each of the lower and upper cooling and heating blocks through the first and second supply lines. A pump for supplying the medium oil chamber may be configured.

In addition, the cooling tank has a cooling coil therein to cool the refrigerant body oil to a certain temperature, and pumps the internal refrigerant body oil at one side of the upper side, and the lower and upper cold and hot blocks through the first and third supply lines. A pump that supplies each medium oil chamber may be configured.

In addition, the controller controls the power of the heating cartridge by comparing the temperatures of the lower and upper molds detected from the plurality of temperature sensors with a set value, and controls the first and second control valves according to a signal of a cycle time for each process. It may include control logic to control the operation.

In an embodiment of the present invention, in one mold consisting of a lower mold and an upper mold, a cooling block having a medium oil chamber is configured in the lower mold and the upper mold, respectively, and high frequency induction by the heating medium oil and the heating cartridge supplied to each medium oil chamber The hot forming using heating and then the cooling process using the refrigerant oil supplied to each of the medium oil chambers can be performed in one process, thereby reducing equipment cost and minimizing the process to reduce the cycle time.

In addition, when molding the thermosetting fiber composite material, after the molding is performed in a hot state in the mold, the cooling process can be performed again to room temperature in the mold, so that deformation and distortion of the molded part can be prevented.

1 is a perspective view of a molding apparatus for a composite material according to an embodiment of the present invention.
2 is an exploded perspective view of a lower mold of a molding apparatus for a composite material according to an embodiment of the present invention.
3 is an exploded perspective view of an upper mold of an apparatus for forming a composite material according to an embodiment of the present invention.
4 is an overall configuration diagram of an apparatus for molding a composite material according to an embodiment of the present invention.
5 is an operational state diagram of a hot forming process of a molding apparatus for a composite material according to an embodiment of the present invention.
6 is an operating state diagram of a cooling process of the molding apparatus for a composite material according to an embodiment of the present invention.

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

However, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings, and the thickness is enlarged to clearly express various parts and regions. Done.

In addition, in order to clearly describe the embodiments of the present invention, parts irrelevant to the description have been omitted, and the same or similar components will be described with the same reference numerals throughout the specification.

1 is a perspective view of an apparatus for molding a composite material according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a lower mold of the apparatus for molding a composite material according to an embodiment of the present invention, and FIG. 3 is an implementation of the present invention. It is an exploded perspective view of an upper mold of an apparatus for molding a composite material according to an example, and FIG. 4 is an overall configuration diagram of an apparatus for molding a composite material according to an embodiment of the present invention.

1 to 4, the composite material applied to the molding apparatus of the composite material according to the embodiment of the present invention is a thermosetting WLF (Wet Laid FRP) having an aramid fiber content of 50% or more as an example in a mold. , The hot forming process and the cooling process are performed in one process.

That is, the thermosetting WLF (Fiber Reinforced FRP) is a fiber reinforced composite material (FRP, Fiber Reinforced) that uses a sheet produced by impregnating short fibers such as aramid fiber, carbon fiber, and glass fiber into a thermosetting resin such as phenol resin as a main reinforcing material. Plastics).

The apparatus for forming a composite material according to an embodiment of the present invention is configured to perform hot forming of the thermosetting WLF at a set temperature for a set time, and then perform a cooling process in the mold.

That is, the molding apparatus of a composite material according to an embodiment of the present invention includes a lower mold 11 and an upper mold 13 having a product molding surface therein, and a lower cold and hot block 21, an upper cold and hot block 31, and a plurality of Heating cartridges (29) (39), a plurality of temperature sensors (43), a heating tank (TK1), a cooling tank (TK2), the first and second control valves (V1) (V2), and the controller (C). Include.

The lower cooling and heating block 11 is fastened to the lower surface of the lower mold 11, and a medium oil chamber 27 is formed therein to be filled with heat medium oil or coolant oil.

In addition, the upper cold and hot block 13 is fastened to the upper surface of the upper mold 13, and a medium oil chamber 37 filled with heat medium oil or coolant oil is formed therein.

Here, the lower and upper cold and hot blocks 21 and 31 are respectively fastened to the block bodies 23 and 33 in which the medium oil chambers 27 and 37 are formed and the block bodies 23 and 33 It consists of a block cover (25) (35) that seals the medium oil chamber (27) (37).

At this time, between the block body (23) (33) and the block cover (25) (35), a ring formed on the circumferential surface of the medium oil chamber (27) (37) on the block body (23) (33) With the sealing 41 inserted in the groove G, it is press-fitted by the block covers 25 and 35 to maintain airtightness of the medium oil chambers 27 and 37.

In addition, the lower and upper cooling and heating blocks 21 and 31 are formed in the medium oil chambers 27 and 37 formed in each block body 23 and 33 in one direction, which is partitioned by a partition wall F. It is formed as a flow passage and comprises a suction port H1 formed on one side and a discharge port H2 formed on the other side.

And the plurality of heating cartridges (29) (39) are installed in each medium oil chamber (27) (37) of the lower and upper cold and hot blocks (23, 33), and each of the above according to the control signal of the controller (C). It is configured to rapidly heat the heat medium oil filled in the medium oil chambers 27 and 37 to a set temperature by high-frequency induction heating.

That is, the heating cartridges 29 and 39 are inserted and fastened through the side surfaces of each block body 23 and 33 of the lower and upper cooling and heating blocks 21 and 31, and the medium oil chamber 27 It is arranged side by side on the medium oil passage of (37).

The plurality of temperature sensors 43 are installed inside the lower mold 11 and the upper mold 13 and configured to detect the temperatures of the lower mold 11 and the upper mold 11, respectively.

In addition, the heating tank TK1 includes a tank for heating and storing the heat medium oil at a predetermined temperature, and the first and second supply lines SL1 and SL2 and the first and second recovery lines RL1 and RL2 ) Through the inlet (H1) and outlet (H2) on each medium oil chamber (27, 37) of the lower and upper cooling blocks (21, 31) to pump the heat medium oil to supply or recover Is composed.

That is, the heating tank (TK1) has a heating coil (C1) therein to heat the heat medium oil to a certain temperature and is controlled by the controller (C), and a pump (P) is configured on one side of the upper portion to heat the heat medium oil. It is configured to pump oil and supply it to the medium oil chambers 27 and 37 of the lower and upper cooling and heating blocks 21 and 31 through the first and second supply lines SL1 and SL2.

In addition, the cooling tank TK2 is composed of a tank that cools and stores the refrigerant oil at a predetermined temperature, and first and third supply lines SL1 and SL3 and first and third recovery lines RL1 It is connected to the suction port H1 and the discharge port H2 on each medium oil chamber 27 and 37 of the lower and upper cooling and heating blocks 21 and 31 through RL3 to pump and supply the refrigerant body oil. Or is configured to recover.

That is, the cooling tank (TK2) has a cooling coil (C2) therein to cool the refrigerant body oil to a certain temperature and is controlled by the controller (C), and a pump (P) is configured in the upper side. It is configured to pump the refrigerant oil of and supply it to the medium oil chambers 27 and 37 of the lower and upper cooling and heating blocks 21 and 31 through the first and third supply lines SL1 and SL3. .

In addition, the first control valve V1 may be formed of a three-way solenoid valve connecting the first, second, and third supply lines SL1, SL2, and SL3, and the control signal of the controller C Accordingly, it is configured to selectively connect the first supply line SL1 to the second supply line SL2 or the third supply line SL3.

In addition, the second control valve V2 may be formed of a 3-way solenoid valve connecting the first, second, and third recovery lines RL1, RL2, and RL3, and the control of the controller C It is configured to selectively connect the first recovery line RL1 to the second recovery line RL2 or the third recovery line RL3 according to a signal.

And the controller (C) is electrically connected to the plurality of heating cartridges (29) (39), the plurality of temperature sensors (43), and the first and second control valves (V1) (V2) Controls the power of the heating cartridges 29 and 39, receives the detection signal from the temperature sensor 43 and compares it with a reference value, and controls the first and second control valves V1 and V2. It is configured to control the output.

That is, the controller C compares the temperatures of the lower mold 11 and the upper mold 13 detected from the plurality of temperature sensors 43 with a set value to control the power of the heating cartridge 29 and 39 The temperature of the lower mold 11 and the upper mold 13 is controlled, and the first and second control valves V1 and V2 are controlled in accordance with a signal of a cycle time for each process to control the flow of heat medium oil or refrigerant oil. It includes a control logic to control.

Therefore, the molding apparatus of a composite material having the above-described configuration performs a hot forming process of the insert material (1) and the thermosetting WLF material (3) that are introduced into the lower mold (11) and the upper mold (13), Subsequently, the cooling process is immediately carried out, so that good quality parts can be produced without deformation and distortion.

5 is an operational state diagram of a hot forming process of a molding apparatus for a composite material according to an embodiment of the present invention, and FIG. 6 is an operational state diagram of a cooling process of a molding apparatus for a composite material according to an embodiment of the present invention.

Hereinafter, a hot forming process and a cooling process using an apparatus for forming a composite material according to an embodiment of the present invention will be described in each step with reference to FIGS. 5 and 6.

5, in the hot forming process, insert material 1 and thermosetting WLF material 3 to be molded are inserted into the lower mold 11 and the upper mold 13, and the upper mold 13 is placed in the lower mold. It is merged with (11).

In this state, the controller C controls the first control valve V1 to connect the first supply line SL1 and the second supply line SL2, and controls the second control valve V2 to control the first control valve V1. The recovery line RL1 and the third recovery line RL3 are connected.

At the same time, the controller (C) drives the pump (P) of the heating tank (TK1) to pump the heat medium oil heated to a certain temperature to the second supply line (SL2) and the first supply line (SL1), and Heat medium oil is supplied to the medium oil chambers 27 and 37 of the lower and upper cooling and heating blocks 21 and 31 through the suction port H1, and it remains in each medium oil chamber 27 and 37. The existing refrigerant oil is recovered to the cooling tank TK2 through the discharge port H2, the first recovery line RL1, and the third recovery line RL3.

In this state, the controller C compares the temperatures of the lower mold 11 and the upper mold 13 detected from the temperature sensor 43 with a set value to control the power of the heating cartridge 29 and 39 The heat medium oil supplied to the medium oil chambers 27 and 37 is rapidly heated through high frequency induction heating so that the lower mold 11 and the upper mold 13 are quickly heated to a set temperature.

Thereafter, when the temperature of the lower mold 11 and the upper mold 13 reaches the set temperature, the insert material 1 and the thermosetting WLF material 3 are hot while pressing the upper mold 13 against the lower mold 11 It is pressed and molded.

In this way, when the hot forming process is completed, the lower mold 11 and the upper mold 13 are kept in a combined state, and the controller C controls the first control valve V1 to control the first supply line SL1. ) And the third supply line SL3 and controlling the second control valve V2 to connect the first recovery line RL1 and the second recovery line RL2.

At the same time, the controller (C) drives the pump (P) of the cooling tank (TK2) to pump the refrigerant oil cooled to a certain temperature, and the third supply line (SL3) and the first supply line (SL1), And supplying refrigerant oil to the medium oil chambers 27 and 37 of the lower and upper cooling and heating blocks 21 and 31 through the suction port H1, and conventionally each medium oil chamber 27 and 37 The heating medium oil remaining in the heating tank is recovered to the heating tank TK1 through the discharge port H2, the first recovery line RL1, and the second recovery line RL2.

In this way, the lower and upper cooling blocks 21 and 31 supplied with the refrigerant oil to each medium oil chamber 27 and 37 cool the lower mold 11 and the upper mold 13 to room temperature while cooling the insert material 1 ) And thermosetting WLF material (3) will be integrated to produce parts that have been molded.

Therefore, according to the molding apparatus of a composite material according to an embodiment of the present invention, in one molding mold, each cooling block having a medium oil chamber is configured to induce high frequency by the heating cartridge and the heat medium oil supplied to each medium oil chamber. The hot forming process using heating and the cooling process using the refrigerant oil supplied to each of the medium oil chambers can be performed in one process, thereby reducing equipment cost and reducing the cycle time by minimizing the process. have.

In addition, when molding the thermosetting fiber composite material, the mold is formed in a hot state in the mold, and then the cooling process is performed in the mold again to room temperature, thereby preventing the deformation and distortion of the molded part due to the need for product movement during molding. Quality can be guaranteed.

One embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and is easily changed by a person of ordinary skill in the technical field to which the present invention pertains from the embodiment of the present invention. It includes all changes to the extent deemed acceptable.

1: insert material
3: Thermosetting WLF material
11: lower brother
13: hieroglyph
21: lower cold and hot block
31: upper cold and hot block
27, 37: medium oil chamber
29, 39: heating cartridge
41: sealing
43: temperature sensor
TK1: heating tank
TK2: cooling tank
V1, V2: first, second control valve
P: pump
H1: inlet
H2: discharge port
SL1, SL2, SL3: 1st, 2nd, 3rd supply line
RL1, RL2. RL3: 1st, 2nd, 3rd recovery line
F: bulkhead
C: controller

Claims (8)

In the molding apparatus for a composite material that pressurizes a thermosetting composite material that is input between a lower mold and an upper mold having a product molding surface inside,
A lower cold/hot block which is fastened to the lower surface of the lower mold and has a medium oil chamber filled with heat medium oil or coolant oil therein; An upper cold/hot block fastened to the upper surface of the upper mold and having a medium oil chamber filled with heat medium oil or coolant oil therein; A plurality of heating cartridges installed in respective medium oil chambers of the lower and upper cooling and heating blocks to heat the heat medium oil filled in each of the medium oil chambers by high frequency induction heating; A plurality of temperature sensors installed inside the lower and upper molds to detect temperatures of the lower and upper molds, respectively; The heat medium oil is heated and stored at a certain temperature, and the heat medium oil is pumped and supplied by being connected to the medium oil chambers of the lower and upper cooling and heating blocks through the first and second supply lines and the first and second recovery lines. A heating tank to recover or recover; The refrigerant body oil is cooled to a certain temperature and stored, and the refrigerant body oil is pumped by being connected to the medium oil chambers of the lower and upper cooling and heating blocks through the first and third supply lines and the first and third recovery lines. A cooling tank for supplying or recovering; A first control valve connecting the first, second, and third supply lines to selectively connect the first supply line to the second supply line or the third supply line according to a control signal; A second control valve connecting the first, second, and third recovery lines to selectively connect the first recovery line to the second recovery line or the third recovery line according to a control signal; And the plurality of heating cartridges, the plurality of temperature sensors, and the first and second control valves are electrically connected to control power of the heating cartridge, and a detection signal from the temperature sensor is received to determine a comparison with a reference value. And a controller that outputs control signals of the first and second control valves,
Each of the lower and upper cold and hot blocks includes a block body in which a medium oil chamber is formed, and a block cover that is fastened to the block body to seal the medium oil chamber,
Between the block body and the block cover, a sealing is inserted into a ring groove formed on the circumferential surface of the medium oil chamber on the block body, and is pressed by the block cover to maintain airtightness of the medium oil chamber. Material molding device. delete delete The method of claim 1,
The lower and upper cold and hot blocks are
An apparatus for forming a composite material that forms an interior of each medium oil chamber as a medium oil passage in one direction partitioned by a partition wall, and includes a suction port formed on one side and a discharge port formed on the other side. The method of claim 4,
The heating cartridge
A molding apparatus of a composite material that is inserted through the side surfaces of each block body of the lower and upper cold and hot blocks and is arranged side by side on the medium oil passage. The method of claim 1,
The heating tank is
A heating coil is internally configured to heat the heating medium oil to a certain temperature, and pumping the internal heating medium oil on one side of the upper part and supplying it to each medium oil chamber of the lower and upper cooling and heating blocks through the first and second supply lines. A composite material molding device consisting of a pump. The method of claim 1,
The cooling tank is
A cooling coil is internally configured to cool the refrigerant body oil to a certain temperature, and an internal refrigerant body oil is pumped at one side of the upper side to each medium oil chamber of the lower and upper cold and hot blocks through the first and third supply lines. A composite material molding device comprising the supply pump. The method of claim 1,
The controller is
Control for controlling the power of the heating cartridge by comparing the temperatures of the lower and upper molds detected from the plurality of temperature sensors with a set value, and controlling the operation of the first and second control valves according to a signal of a cycle time for each process Composite material molding apparatus including logic.

Images