CN206242524U - The device of fibre reinforced composites shaped article is manufactured using stamping mold - Google Patents

Abstract

The utility model provides a device for manufacturing fiber-reinforced composite molding products by using a stamping die. By clamping the above-mentioned prepreg between the upper mold and the lower mold, the sandwiched prepreg is simultaneously pressurized and heated. The above-mentioned upper mold and the lower mold are separated from each other, and the cooling gas is sprayed between the cured prepreg attached to the press surface of one of the above-mentioned upper mold and the above-mentioned lower mold, and the above-mentioned press surface attached, thereby The above-mentioned cured prepreg is released from the mold. Compared with the prior art, the utility model has higher productivity and less energy loss.

Description

Device for manufacturing molded products of fiber-reinforced composite materials using a stamping die

The application date of this utility model request: January 8, 2016, the application number: special request 2016‐2827, the name of the invention: the manufacturing method of the fiber reinforced composite material molding product and the stamping die of the Japanese prior application.

technical field

The utility model relates to a technology in the field of stamping molding, in particular to a method for manufacturing a fiber reinforced composite product after stamping and molding a prepreg, and a stamping mold used in the manufacturing method.

Background technique

Fiber-reinforced composite molding products generally use materials such as epoxy resin, so they can be manufactured by impregnating fiber bundles with epoxy resin, drying them to obtain prepregs, and then heating and pressurizing them to cure them.

It is recorded in paragraph [0022] of [International Publication No. 2013/081058 pamphlet] that such manufacturing methods usually include autoclave molding, vacuum bag molding, RTM method, and stamping molding, among which stamping molding has the highest production efficiency, The fiber-reinforced composite molded products produced are of the highest quality and are therefore widely utilized.

The existing technology is such as [International Publication No. 2013/081058 pamphlet]. However, in the prior art, because the prepreg is different from the metal material, the cured prepreg is easily attached to the mold during stamping. When the cured prepreg is separated from the mold (demoulding), the mold needs to be cooled first, and the time spent on each cooling will cause a corresponding decrease in production efficiency. The existing mold cooling method is to use time-consuming water cooling or oil cooling, and when it is necessary to continue to make fiber-reinforced composite molded products after cooling, the cooled mold must be heated to the original temperature, so in the continuous production of fiber The entire process of reinforcing composite moldings takes too long.

Utility model content

The utility model aims at the above-mentioned deficiencies in the prior art, and proposes a device for manufacturing fiber-reinforced composite products by using a stamping die, which has the advantages of short time consumption and low energy consumption.

The utility model is achieved through the following technical solutions:

The utility model further relates to a manufacturing mold of fiber-reinforced composite material molding products, including the stamping surface to which the above-mentioned prepreg is attached, and the above-mentioned cooling gas is easier to penetrate into the space between the above-mentioned cured prepreg and the above-mentioned stamping surface. A stamping die provided on the inclined portion of the edge of the stamping surface.

The die for stamping is a die with a hollow structure.

technical effect

Compared with the prior art, the utility model can release the cured prepreg attached to the mold in a short time. And because there is no need to cool the mold to the same temperature as the demoldable, cured prepreg, the fluctuation of temperature is reduced, and energy loss is suppressed.

Description of drawings

Fig. 1 is the schematic diagram when the prepreg is arranged in the lower mold in the embodiment;

Fig. 2 is a schematic diagram of the state in which the upper mold is lowered, the prepreg is sandwiched between the upper mold and the lower mold, and pressurized and heated at the same time in the embodiment;

Fig. 3 is the schematic diagram when upper mold is returned to original position in the embodiment;

In the picture: the prepreg is attached to the upper mold;

Fig. 4 is the three-dimensional schematic diagram A of upper mold;

Fig. 5 is the side view of patrix;

Fig. 6 is a three-dimensional schematic diagram B of the upper mold, which is the flipped state of Fig. 4;

Fig. 7 is the sectional view of patrix;

In the figure: 1 stamping forming device, 2 prepreg, 21 cured prepreg (fiber reinforced composite molding product), 3 upper mold, 31 stamping surface, 32 inclined part, 33 handle part, 34 hollow part, 4 lower part Mold, 5 cooling part, 51 cooling gas ejection part, 52 cooling duct, 6 upper mold heating part, 7 lower mold heating part.

detailed description

This embodiment relates to a manufacturing method of fiber-reinforced composite molded products. The prepreg obtained by impregnating and drying fiber bundles such as carbon fiber and glass fiber with thermoplastic resin or thermosetting resin is punched and formed to obtain fiber reinforcement. Resin composite material molding products, or fiber-reinforced resin composite material/metal integral molding products formed by bonding the above prepregs and metals such as aluminum, iron, titanium, etc. under pressure and heating. Fiber-reinforced composite molded products can be used in parts such as aircraft and automobiles depending on the application and shape.

The manufacturing method of the present embodiment is realized by the stamping device 1 of the upper mold 3 and the lower mold 4 as shown in Figure 1, the upper mold 3 of the device is movable up and down, and compression is realized between the upper mold 3 and the lower mold 4 (stamping) objects.

The stamping device 1 is further provided with a heating unit 6 for an upper mold and a heating unit 7 for a lower mold to heat the upper mold 3 and the lower mold 4 respectively.

The stamping device 1 is provided with a cooling unit 5 .

In this embodiment, the manufacturing process of the fiber-reinforced resin composite molded product in the fiber-reinforced composite molded product is specifically as follows:

1) First, heat the upper mold 3 and the lower mold 4 to about 130°C to 150°C.

2) Next, an epoxy resin prepreg 2 containing carbon fibers is disposed near the central portion above the lower mold 4 . At this time, the prepreg 2 is preliminarily heated as necessary. This state is shown in Figure 1.

In addition, when manufacturing fiber-reinforced composite/metal unibody products other than fiber-reinforced resin composite molded products, prepregs are placed on sheet-like metals such as iron, aluminum, and titanium.

3) Next, the upper mold 3 is moved downward, and the prepreg 2 is sandwiched between the upper mold 3 and the lower mold 4 and pressurized. At this time, the pressure is about 1MPa to 8MPa. The stamping time is about 30 seconds to 180 seconds. This state is shown in Figure 2.

After the pressurization and heating steps described above, the prepreg 2 becomes a cured prepreg 21 (fiber-reinforced composite material molded product).

4) In order to take out the cured prepreg 21, the upper mold 3 needs to be raised. At this time, the cured prepreg 21 is attached to the surface of the upper mold 3 . Since the cured prepreg 21 and the upper mold 3 are both in a high temperature state, the cured prepreg 21 cannot be separated from the upper mold 3 immediately for demoulding.

5) In order to release the cured prepreg 21 from the mold, it is necessary to apply the cooling gas induced from the cooling gas duct 52 from the cooling gas ejection part 51 toward the lateral direction of the cured prepreg 21, so that the cooling gas is as It is best to apply it deep enough between the cured prepreg 21 and the upper mold 3 .

In order to uniformly diffuse and apply the cooling gas toward the side of the cured prepreg 21 , it is best to use a flat rather than a circular cooling outlet.

6) After the cooling gas is applied, the cured prepreg 21 and the stamping surface 31 (surface) of the upper mold 3 are cooled instantly, and the cured prepreg 21 can be released from the mold at this time.

The cooling gas only needs to be a gas that can instantly cool the cured prepreg 21 and the press surface 31 , and is more preferably air at about -20°C. The cooling gas at about -20°C is preferably generated by a cold air generator manufactured by Nippon Seiki Co., Ltd.

The cured prepreg 21 cooled by applying cooling gas has been released from the upper mold 3 at this time. The time required for mold release is about 5 seconds to about 60 seconds after the application of the cooling gas, which is extremely short. And the temperature of the mold after the cured prepreg 21 is released is about 120-140°C. In other words, when the mold is demolded with cooling air, the temperature of the mold only drops by about -5°C to -10°C.

To sum up, in this method, cooling gas is applied between the prepreg attached to the mold and the stamping surface, so that the attached part of the mold and the cured prepreg is cooled rapidly, thereby demoulding smoothly.

The above-mentioned method is implemented by using a mold with a structure between the cured prepreg 21 and the stamping surface 31 that makes the above-mentioned cooling gas easier to adhere deeply, specifically:

As shown in FIG. 4 , the upper die 3 is provided with an inclined portion 32 which makes it easier for the cooling gas to penetrate into the center of the stamping surface 31 .

Preferably, the inclined portion 32 is disposed near the cooling gas ejection portion 51 in order to make it easier for the cooling gas applied from the ejection portion 51 to penetrate deeply between the adhered cured prepreg 21 and the stamping surface 31 .

Further preferably, the shape of the inclined portion 32 can enable the cooling gas to be uniformly applied to the entire stamping surface 31. Specifically, the shape of the inclined portion 32 is best to diffuse from the edge of the upper mold 3 to its central part, For example, the trapezoidal shape shown in the embodiment of FIG. 4 .

The inclination angle of the inclination portion 32 is not limited, and is preferably about 10° to 45° relative to the installation surface of the upper mold.

As shown in Fig. 5 (side view), Fig. 6 (perspective view B), and Fig. 7 (sectional view), the upper die 3 is preferably provided with a hollowed-out hollow portion 34 on the opposite side of its stamping surface 31, the hollow The part specifically refers to the opposite side of the prepreg in contact with the upper mold or the lower mold (refer to FIG. 6 etc.).

The shape of the hollow part 34 adopts but is not limited to a cuboid as shown in FIG. 6 , and its size is not limited, but the ratio between 50% and 80% of the overall volume of the mold is the best.

The hollow part 34 can also be realized by combining and splicing plate-like metals, besides directly hollowing out metal ingots. This type of method for combining plates to make molds is also within the scope of the present invention. In this way, the generation of waste can be suppressed and the hollow part can be provided with a large space.

In this embodiment, since the mold is not subjected to water-cooling treatment, and there is no need to arrange a water-cooled pipe in the mold, a hollow part can be provided in the mold, and the mold with the hollow part 34 is lighter in weight than the ingot-shaped mold without the hollow part. /3～1/2, it is easier to replace the mold, and the temperature rises faster when heating.

As shown in Figures 1 to 7, the mold is further provided with a handle portion 33, which can be replaced with a mold of a desired shape if necessary.

The fiber-reinforced composite material molding product of the utility model is not limited to sheet shape, and can also be made into other shapes.

The technical effects of this embodiment include:

1) A method of manufacturing a fiber-reinforced composite material molded product after stamping the prepreg 2, including the process of sandwiching the above-mentioned prepreg 2 between the upper mold 3 and the lower mold 4, and placing the sandwiched prepreg 2 Simultaneously perform the process of pressurizing and heating, the process of separating the upper mold 3 and the lower mold 4 from each other, and the cured prepreg adhered to the pressing surface 31 of one of the upper mold 3 and the lower mold 4 21. A method of applying cooling gas between the above-mentioned press surface 31 to which it is attached, thereby releasing the above-mentioned cured prepreg 21 from the mold. The method can demould the cured prepreg attached to the mold in a short time, reduce the range of temperature up and down, and reduce energy consumption at the same time.

Specifically, by applying cooling gas between the cured prepreg 21 and the above-mentioned press surface 31, the adhered part is rapidly cooled, so that the cured prepreg 21 can be released from the mold in a short time. At the same time, the time required to raise the temperature (130-150° C.) for the next manufacturing is reduced.

Since there is no need to lower the overall temperature of the mold, the mold temperature will not be too low (generally only about -5°C to -10°C), and it is easier to heat to the required temperature. However, the existing water-cooling technology needs to lower the mold temperature below 100°C, which consumes time and energy when reheating. Therefore, the utility model suppresses the energy consumed by heating while saving time.

At the same time, the cooling gas can rapidly cool the mold and prepreg and release the mold, thereby preventing the deformation and displacement of the fiber bundles in the resin.

2) In order to make it easier for the cooling gas to penetrate between the cured prepreg 21 and the pressing surface 31 , an inclined portion 32 is provided on the edge of the pressing surface 31 . The cooling gas is introduced from the inclined portion 32 to the center of the punching surface, so that more cooling gas can penetrate between the cured prepreg 21 and the punching surface more easily, so that the cooling speed of the punching surface becomes extremely fast.

3) The above-mentioned inclined portion 32 has a general shape that spreads from the edge of the above-mentioned punching surface 31 to the center of the above-mentioned punching surface 31, so the gas introduced through the inclined portion 32 is easy to flow between the adhered cured prepreg 21 and the punching surface 31. Diffusion, the cured prepreg 21 can be released from the mold at other times.

4) At least one of the upper mold 3 and the lower mold 4 is a hollow mold, so that when the cooled and cured prepreg 21 is demolded, it can be heated to the required temperature more quickly, saving the time of the manufacturing process, thereby The production volume of the cured prepreg 21 is increased by the amount corresponding to the unit time. At the same time, the hollow mold is lighter and easier to replace, and has achieved effects that cannot be achieved by water-cooled molds in all aspects.

5) The mold used for stamping and forming the prepreg 2 to produce a fiber-reinforced composite product, including the stamping surface 31 on which the above-mentioned prepreg 2 is attached, and the mold for making the above-mentioned cooling gas easier to penetrate into the above-mentioned solidified A punching mold provided between the prepreg 21 and the punching surface 31 at the inclined portion 32 at the edge of the punching surface 31 . This stamping mold is extremely important for the process of stamping the prepreg 2 to produce a fiber-reinforced composite product. By applying cooling gas, the cured prepreg 2 attached to the stamping surface 31 is easier to remove from the stamping surface 31. mold.

6) The above-mentioned mold is hollow, which can realize the above-mentioned rapid heating and cooling, thereby reducing the manufacturing time, and because of its light size and easy replacement, it also reduces the burden on operators.

The above specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the utility model. The scope of protection of the utility model is subject to the claims and is not limited by the above specific implementation. Each implementation scheme within its scope is bound by the utility model.

Claims (6)

1. a kind of manufacture mould of fibre reinforced composites shaped article, it is characterised in that including rushing accompanying by prepreg Pressure surface, and go deep into being arranged on stamping surface edge and tool between cured prepreg and stamping surface to be easier to cooling gas There is the punching press mould of the rake of center diffusion type from edge toward stamping surface.

2. mould according to claim 1, it is characterized in that, described punching press mould is the mould with hollow structure.

3. mould according to claim 1, it is characterized in that, described mould has to make mould cold with cured prepreg But the cooling gas conduit and cooling gas blowing unit and by the cured prepreg demoulding being provided with, wherein：Cooling gas are sprayed Go out portion to be set towards the plane of structure direction of cured prepreg, the outlet of cooling gas blowing unit is flat.

4. mould according to claim 1, it is characterized in that, described diffusion type is trapezoidal shape.

5. mould according to claim 2, it is characterized in that, described hollow structure is directly to hollow out cast metals or use The combined and spliced mode of plate-shape metal is realized.

6. the mould according to claim 2 or 5, it is characterized in that, described hollow structure accounts for the punching press mould entirety The 50%~80% of volume.