KR102147858B1 - Composite material molding apparatus and molding method using the same - Google Patents

Abstract

The present invention relates to a composite material molding apparatus and a molding method using the same, capable of improving productivity and reducing a manufacturing cost. According to the present invention, the composite material molding apparatus includes a first mold and a second mold, in which a cavity is formed on a mold mating surface, a molding material and a membrane for supporting one plate surface of the molding material are stacked in the cavity, and the first mold and the second mold are coupled to and separated from each other, wherein a runner communicating with the cavity and configured to inject a molding resin into a space between the cavity and the molding material is formed in one of the first mold and the second mold, and a fluid injection path communicating with the cavity and configured to inject a fluid into the space between the cavity and the membrane and a fluid recovery path configured to recover the fluid injected into the cavity are formed in a remaining one of the first mold and the second mold.

Description

Composite material molding apparatus and molding method using the same {COMPOSITE MATERIAL MOLDING APPARATUS AND MOLDING METHOD USING THE SAME}

The present invention relates to a composite material molding apparatus and a molding method using the same.

Mold refers to a metallic mold made to mass-produce products of the same standard.

Molds are widely used in electric/electronic products, automobiles, aircraft, semiconductors, communication devices, and everyday products such as precision machinery, and ultra-precision products.

As a molding device using such a mold, a molding device for producing a molded product having a predetermined shape and dimensions by injecting a molding resin such as a thermoplastic resin or a thermosetting resin, which is melted into a cavity in the mold, and a mold There is a molding apparatus for manufacturing a composite material molded article impregnated with a molding resin on one side of the fibrous body by placing a fibrous body made of a fibrous material in an inner cavity and then injecting a molding resin.

On the other hand, a molding apparatus for manufacturing a composite material molded product impregnated with a molding resin on one side of the molding material is, when the shape of the composite material molded product to be molded is complicated or has a difference in thickness, the composite material after cutting the fabric of the molding material After pre-forming to the cross-sectional shape of the molded product, the pre-formed molding material is placed in the cavity of the mold, and the mold is molded, and then the molding resin is placed in the space between the plate surface of one side of the molding material and the cavity. After injection and curing, it is demolded to produce a composite molded article impregnated with a molding resin.

However, such a conventional composite material molding apparatus has a problem in that a preforming process is indispensable during the molding process, and thus the manufacturing process time increases, thereby reducing productivity as well as increasing manufacturing cost.

In addition, when the molding resin is injected into the molding material and pressurized, if the thickness of the molding material is not partially constant, a large amount of pressure is applied to the thick part of the molding material, and the pressure distribution acting on the molding material with respect to the pressing direction is increased. Since it is not uniform, the molding resin is not uniformly impregnated into the molding material, and thus, as the ratio of the resin increases, the weight of the final molded composite material molded product increases, and there is a problem that the molded product is defective.

Korean Patent Publication No. 10-2019-0047855

The present invention is to solve the above-described problems, by simplifying the manufacturing process of the molded article, not only improves the productivity, but also reduces the manufacturing cost, the weight of the molded composite material molded article to be molded is lightened, and the composite material molding that can reduce defects. It is an object of the invention to provide an apparatus and a molding method using the same.

An object of the present invention includes a first mold and a second mold in which a cavity is formed on a molded surface, and a molding material and a membrane supporting one plate surface of the molding material are stacked and disposed in the cavity, and molded and molded apart. And, in any one of the first mold and the second mold, a runner communicating with the cavity and for injecting a molding resin into the space between the cavity and the molding material is formed, and the first mold and the second mold 2 In the other of the molds, a fluid injection path communicating with the cavity and for injecting fluid into the space between the cavity and the membrane, and a fluid recovery path for recovering the fluid injected into the cavity are formed, forming a composite material Can be achieved by means of a device.

Here, it may further include a pressure sensor that is provided in the fluid injection path or the fluid recovery path and measures the pressure of the fluid flowing through the fluid injection path or the fluid recovery path.

Based on the pressure data measured by the pressure sensor, it may further include a control valve for controlling the pressure of the fluid acting on the membrane by adjusting the flow rate of the fluid flowing through the fluid injection passage or the fluid recovery passage. .

It may include a mold sealing part provided on at least one of the mold surfaces of the first mold and the second mold to maintain airtightness between the first mold and the second mold.

It may further include a pump that pressurizes the fluid into the cavity.

The membrane may include any one of rubber, silicone, and polyurethane.

It is an object of the present invention, according to another field of the present invention, in a molding method using a composite material molding apparatus including a first mold and a second mold that form a cavity on a molded surface and are molded and molded apart, wherein the cavity is Seating the membrane; Laminating a molding material on the membrane; Molding the first mold and the second mold; Injecting a molding resin into the space between the cavity and the molding material, injecting and recovering fluid into the space between the cavity and the membrane, and molding a composite material; And it may be achieved by a method for forming a composite material comprising the step of separating the first mold and the second mold.

Here, measuring the pressure of the fluid injected or recovered into the cavity; And controlling the pressure of the fluid acting on the membrane based on the measured pressure data.

According to the present invention, by forming a molding material in a mold using a fluid and molding a molding resin in the molding material, the manufacturing process of the molded product can be simplified, thereby improving productivity as well as reducing manufacturing cost. The weight of the composite material molded product can be reduced and defects can be reduced.

1 is a configuration diagram of a composite material molding apparatus according to an embodiment of the present invention,
2 is a view showing a process of molding a composite material molded article using the composite material molding apparatus according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the present embodiments are intended to complete the disclosure of the present invention, It is provided to fully inform the technician of the scope of the present invention.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, “comprises” and/or “comprising” do not exclude the presence or addition of one or more other elements other than the mentioned elements. Throughout the specification, the same reference numerals refer to the same elements, and “and/or” includes each and all combinations of one or more of the mentioned elements. Although "first", "second", and the like are used to describe various elements, it goes without saying that these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical idea of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used with meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically.

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

1 shows a composite material molding apparatus according to an embodiment of the present invention.

As shown in Figure 1, the composite material molding apparatus 1 according to an embodiment of the present invention includes a first mold 10 and a second mold 20.

The first mold 10 and the second mold 20 are provided to be mutually dividable so as to be molded or separated. Here, in the present embodiment, the mold located in the upper part of FIG. 1 is referred to as a first mold 10, and the mold located in the lower part of the first mold 10 is referred to as a second mold (20).

A first cavity 11 is formed on the mating surface of the first mold 10, and a second cavity 21 corresponding to the first cavity 11 is formed on the mating surface of the second mold 20. .

Accordingly, as the first mold 10 and the second mold 20 are molded together, for example, as the first mold 10 and the second mold 20 are in close contact with each other, the first mold 10 and the second mold 20 The mold 20 forms one cavity in which the first cavity 11 and the second cavity 21 form one volume space.

The second mold 20 is in close contact with or spaced apart from the first mold 10 to close or open the cavities 11 and 21.

In addition, when the first mold 10 and the second mold 20 are molded on the mold surface of the first mold 10 and the second mold 20, the first mold 10 and the second mold 20 ) Is provided with a mold sealing portion 50 for maintaining airtightness between.

The mold sealing part 50 includes a sealing member 51 and a receiving groove 55 for accommodating the sealing member 51.

In this embodiment, an O-ring having a closed loop shape is provided as the sealing member 51, but a mechanical seal may be provided instead of the O-ring.

The receiving groove 55 has a closed loop shape, and is recessed in a semicircular cross-sectional shape on each mold surface of the first mold 10 and the second mold 20.

Accordingly, when the first mold 10 and the second mold 20 are molded, the sealing member 51 is elastically deformed and accommodated in the receiving groove 55, so that the first mold 10 and the second mold 20 ) Will be kept confidential.

Here, in the present embodiment, the mold sealing part 50 is shown to be simultaneously provided on the mating surfaces of the first mold 10 and the second mold 20, but the present invention is not limited thereto, and the mold sealing part 50 is It may be provided only on the mold surface of the first mold 10 or the mold surface of the second mold 20.

Meanwhile, in the cavities 11 and 21 between the first mold 10 and the second mold 20, a molding material 100 made of a fibrous body made of a fibrous material (see FIG. 2) and one side of the molding material 100 Membrane 110 (refer to FIG. 2) supporting the is stacked and seated.

Here, the membrane 110 has a cross-sectional shape corresponding to the molding material 100 and may include any one of rubber, silicone, and polyurethane.

In the first mold 10 of the composite material molding apparatus 1 according to an embodiment of the present invention, the first mold 10 communicates with the first cavity 11 and is located in the space between the first cavity 11 and the molding material 100. A runner 15 for injecting the molding resin 200 (see FIG. 2) is formed.

In the second mold 20, a fluid injection path 31 communicating with the second cavity 21 and for injecting a fluid 210 (refer to FIG. 2) into the space between the second cavity 21 and the membrane 110 ) And a fluid recovery path 35 through which the fluid 210 injected into the second cavity 21 is recovered is formed. Here, the fluid 210 may include water or oil.

The fluid injection path 31 communicates with the second cavity 21 and is formed in a central region of the second mold 20. The fluid injection path 31 is connected to a fluid storage tank 39 for storing the fluid 210, and a pump 37 for pressurizing the fluid 210 into the second cavity 21 is provided.

Accordingly, when the pump 37 is operated, the fluid 210 stored in the fluid storage tank 39 is pressurized and pumped by the pump 37, and through the fluid injection path 31, the second cavity 21 and the membrane ( 110) and pressurizes the membrane 110.

The fluid recovery passage 35 communicates with the second cavity 21 and is provided in plural in the second mold 20. The plurality of fluid recovery passages 35 serve as passages through which the fluid 210 injected into the space between the second cavity 21 and the membrane 110 is recovered to the fluid storage tank 39.

On the other hand, a pressure sensor 41 and a control valve 45 are provided in each fluid recovery path 35.

The pressure sensor 41 measures the pressure of the fluid 210 flowing through the fluid recovery path 35.

The control valve 45 controls the pressure of the fluid 210 acting on the membrane 110 based on the pressure data measured by the pressure sensor 41. For example, as the opening degree of the control valve 45 is adjusted, the flow rate of the fluid 210 flowing through the fluid recovery path 35 is controlled, thereby controlling the pressure of the fluid 210 acting on the membrane 110.

In this way, by controlling the flow rate of the fluid recovery path 35, the molding material 100 in the cavities 11 and 21 according to the shape of the composite material molded article by the pressure of the fluid 210 acting on the membrane 110 It becomes possible to control the seating direction and the flow of the molding resin. In addition, by controlling the flow of the molding resin, it facilitates impregnation and discharge of the molding resin 200 into the molding material 100, thereby lowering the excessive resin ratio, which is one of the reasons for hindering the effect of weight reduction, You can get quality.

With this configuration, a process of forming a molded composite material using the composite material molding apparatus 1 according to an embodiment of the present invention will be described as follows.

First, the membrane 110 is seated in the second cavity 21 of the second mold 20.

Next, a molding material 100 obtained by cutting the fabric is laminated and disposed on the membrane 110.

Subsequently, the first mold 10 is lowered toward the second mold 20 to form the first mold 10 and the second mold 20.

At this time, as the first mold 10 and the second mold 20 are molded, the first mold 10 and the second mold 20 are molded products having a desired cross-sectional shape as shown in FIG. 2. The cavities 11 and 21 for forming are formed. Meanwhile, since the molding material 100 is formed into a desired cross-sectional shape in the cavities 11 and 21 by the molding of the first mold 10 and the second mold 20, a separate preforming process during the molding process This becomes unnecessary.

Then, the molding resin 200 is injected into the space between the first cavity 11 and the molding material 100 through the runner 15 formed in the first mold 10.

At the same time, the pump 37 is operated to inject the fluid 210 stored in the fluid storage tank 39 into the space between the second cavity 21 and the membrane 110 through the fluid injection path 31.

At this time, the fluid 210 injected into the space between the second cavity 21 and the membrane 110 is recovered to the fluid storage tank 39 through a plurality of fluid recovery passages 35.

On the other hand, in the process of pressing the molding resin 200 on the molding material 100, based on the pressure data measured through the pressure sensor 41 disposed in each fluid recovery path 35, each fluid recovery path ( 35) to measure the pressure.

If it is detected that the pressure of the fluid 210 flowing through the fluid recovery path 35 on one side exceeds or falls below the range of the set pressure value, the control valve 45 disposed in the fluid recovery path 35 By adjusting the opening degree, the pressure of the fluid 210 flowing through the fluid recovery path 35 is adjusted within the range of the set pressure value, and the pressure of the fluid 210 acting on the membrane 110 is applied to the molded product of the composite material. Depending on the shape, it is possible to control the seating direction of the molding material 100 and the flow of the molding resin in the cavities 11 and 21.

Accordingly, the fluid 210 acting on the membrane 110 not only helps the seating of the molding material 100 seated in the cavities 11 and 21, but also, regardless of the direction and cross-sectional shape of the seated molding material 100 The molding material 100 laminated on the membrane 110 is formed into a cross-sectional shape of a molded product of a composite material without a separate pre-forming process, and is formed on one side of the molding material 100. The injected molding resin 200 is also easily impregnated and discharged into the molding material 100, thereby reducing an excessive resin ratio locally and obtaining a uniform quality.

After a certain period of time has elapsed after the injection of the molding resin 200 and the injection of the fluid 210 into the cavities 11 and 21 are completed, the first mold 10 is lifted from the second mold 20 and the first mold ( Separate the mold from 10) and the second mold (20).

The first mold 10 and the second mold 20 are mold-separated to open the cavities 11 and 21, and the composite molded product in which the molding resin 200 is impregnated in the molding material 100 of the fiber body is inserted into the cavity. Separated from (11, 21), it is possible to obtain a finished composite material molded article.

As described above, according to the present invention, it is possible to mold the molding resin in the molding material while forming the molding material in the mold using a fluid, thereby simplifying the manufacturing process of the molded product, thereby improving productivity as well as reducing manufacturing cost. In addition, it is possible to reduce the weight of the molded composite material and reduce defects.

Here, in the above-described embodiment, it is described that the pressure sensor and the control valve are provided in the fluid recovery path, but the present invention is not limited thereto, and the pressure sensor and the control valve are provided in the fluid injection path, or the fluid injection path and the fluid recovery path. It can also be prepared at the same time.

In addition, in the above-described embodiment, it is described that a fibrous body is provided as a molding material, but the present invention is not limited thereto, and the molding material may include a material of a material that can be plastically deformed and has excellent adhesion to a molding resin.

In the above, embodiments of the present invention have been described with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features. You can understand. Therefore, the embodiments described above are illustrative in all respects, and should be understood as non-limiting.

1: Composite material molding device
10: first mold
20: second mold
11,21: cavity
31: fluid injection furnace
35: fluid recovery furnace
37: pump
39: fluid storage tank
41: pressure sensor
45: control valve
50: mold sealing part
51: sealing member
55: receiving groove
100: molding material
110: membrane

Claims (8)

A first mold and a second mold are formed by forming a cavity in a molded surface, and a molding material and a membrane supporting one plate surface of the molding material are stacked and disposed in the cavity, and molded and separated,
In any one of the first mold and the second mold, a runner communicating with the cavity and for injecting a molding resin into a space between the cavity and the molding material is formed,
In the other one of the first mold and the second mold, a fluid injection path communicating with the cavity and for injecting a fluid into the space between the cavity and the membrane, and a fluid recovery in which the fluid injected into the cavity is recovered A device for forming a composite material with a furnace. The method of claim 1,
A composite material molding apparatus further comprising a pressure sensor provided in the fluid injection path or the fluid recovery path and measuring a pressure of a fluid flowing through the fluid injection path or the fluid recovery path. The method of claim 2,
Based on the pressure data measured by the pressure sensor, by adjusting the flow rate of the fluid flowing through the fluid injection path or the fluid recovery path, the composite further comprising a control valve to control the pressure of the fluid acting on the membrane Material molding device. The method of claim 1,
A composite material molding apparatus comprising a mold sealing part provided on at least one of the mating surfaces of the first mold and the second mold to maintain airtightness between the first mold and the second mold. The method of claim 1,
A composite material molding apparatus further comprising a pump that pressurizes the fluid into the cavity. The method of claim 1,
The membrane is a composite material molding apparatus comprising any one of rubber, silicone, and polyurethane. In the molding method using a composite material molding apparatus comprising a first mold and a second mold formed by forming a cavity in the molded surface and molded and separated,
Seating a membrane in the cavity;
Laminating a molding material on the membrane;
Molding the first mold and the second mold;
Injecting and recovering a fluid into the space between the cavity and the membrane while injecting a molding resin into the space between the cavity and the molding material, and molding a composite material; And
A method for forming a composite material comprising the step of separating the first mold and the second mold. The method of claim 7,
Measuring the pressure of the fluid injected or recovered into the cavity; And
Based on the measured pressure data, further comprising the step of controlling the pressure of the fluid acting on the membrane, composite material molding method.

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