CN211942188U - Simple flexible pressure equalizing pad for hot press molding of composite material and molding device - Google Patents
Simple flexible pressure equalizing pad for hot press molding of composite material and molding device Download PDFInfo
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- CN211942188U CN211942188U CN201922074130.0U CN201922074130U CN211942188U CN 211942188 U CN211942188 U CN 211942188U CN 201922074130 U CN201922074130 U CN 201922074130U CN 211942188 U CN211942188 U CN 211942188U
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Abstract
The utility model discloses a simple flexible pressure equalizing pad and a forming device for hot press forming of composite materials, wherein the simple flexible pressure equalizing pad comprises a demoulding cloth layer and a fiber cloth layer, and the demoulding cloth layer is paved and pasted on the fiber cloth layer; the simple flexible pressure equalizing pad is mainly used for assisting the autoclave molding process of the composite material part. Compare in traditional pressure pad, the utility model discloses simple and easy flexible voltage-sharing pad simple structure, cost of manufacture are low, preparation cycle is short, just the utility model discloses the flexibility of simple and easy flexible voltage-sharing pad is better than pressure pad, and it is good with combined material part matching degree in supplementary forming process, has guaranteed the surface smoothness degree after the combined material part shaping better.
Description
Technical Field
The utility model relates to a simple and easy flexible pressure equalizing pad and forming device for combined material hot briquetting.
Background
The resin-based carbon fiber composite material has superior performances of high specific strength and specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, good dimensional stability and the like, and is a high-performance structural material which is widely applied in the fields of aviation, aerospace, traffic and the like at present. In the molding process of various carbon fiber composite materials, the autoclave process has uniform molding temperature and pressure and good adaptability to parts of different materials, shapes, sizes and structures, thereby becoming one of the main process methods for researching and manufacturing aerospace high-quality composite material components.
When the composite material part is formed by using the autoclave process, because the pressure in the autoclave is high, folds and textures of auxiliary materials such as a vacuum bag, an air felt and the like can be inevitably reflected to the forming surface of the part, therefore, a metal or rubber pressure pad is usually used for auxiliary forming in the industry to ensure that the pocket attaching surface of the part is smooth and flat, and the requirements of part assembly and the like on the surface are met.
The conventional composite material part auxiliary forming pressure pad is prepared by adopting a rubber and glass fiber co-curing forming process, the preparation process is relatively complex, the preparation period is long, the manufacturing cost is high, and the flexibility of the pressure pad is poor. For the plane type composite material part, a pressure equalizing pad which does not need to be solidified and formed and has good flexibility can be found to replace the traditional pressure pad. However, the use of metal or rubber pressure pads has several major problems: (1) the metal pressure pad has low cost, needs to be preformed, has relatively poor deformation following performance, is easy to deform and scratch and damage during storage, and causes the problems of uneven pressure during curing of parts, local resin enrichment, surface damage and the like; (2) when the rubber pressure pad is manufactured, a pressure pad forming tool needs to be manufactured, rubber and internal reinforcing fibers are used for solidifying a corresponding molded surface, the shape following performance is good, the cost is high, the manufacturing process is complex, the rubber is easy to oxidize at high temperature, the problems of deformation, surface damage and the like exist after the rubber enters a tank for many times, the quality of parts is influenced, and the number of times of repeated use is small. Therefore, when parts are manufactured by using the traditional pressure pad scheme, the manufacturing process is relatively complex, the manufacturing period is long, the manufacturing cost is high, the later maintenance is inconvenient, and the defects are particularly obvious when simple plane or curved parts are manufactured.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of foretell traditional pressure pad existence, the utility model provides a simple and easy flexible pressure equalizing pad and forming device for combined material autoclave molding process, its quality is light, and non-deformable can provide even pressure at the part solidification to can avoid fibre cloth to absorb resin and influence part thickness. The specific technical scheme is as follows:
the utility model provides a simple and easy flexible pressure-equalizing pad for combined material hot briquetting, this simple and easy flexible pressure-equalizing pad include drawing of patterns cloth layer and fibre cloth layer, drawing of patterns cloth layer shop pastes and forms simple and easy flexible pressure-equalizing pad on the fibre cloth layer.
According to the simple flexible pressure-equalizing pad for the hot-press molding of the composite material, the demolding cloth layer is PTFE demolding cloth with glue on one surface, and the surface with the glue is paved and adhered on the fiber cloth layer.
In the simple and flexible uniform pressure pad for hot press molding of the composite material, the fiber cloth layer is made of dry polyester strippable cloth.
The device for carrying out hot press molding on the composite material part by using the simple flexible pressure equalizing pad comprises the simple flexible pressure equalizing pad, a composite material part molding die bottom plate and a sealing material; the composite material part forming die is characterized in that a composite material preformed part is placed on a bottom plate of the composite material part forming die, and the simple flexible pressure-equalizing pad is pressed on the composite material preformed part; the sealing material comprises a vacuum bag and a sealing rubber strip, the vacuum bag covers the simple flexible pressure-equalizing pad, and the sealing rubber strip enables the vacuum bag to be attached to a composite material part forming mold bottom plate on the periphery of the composite material preforming part.
The specific use method of the simple flexible pressure equalizing pad comprises the following steps:
1) covering a pressure equalizing pad: paving and covering one surface of the demolding cloth of the simple flexible uniform pressure pad downwards on the composite material preforming part;
2) shearing and splicing: cutting and splicing the simple flexible uniform pressure pad in the step 1) according to the molded surface and the size of the composite material preformed part so as to ensure that the simple flexible uniform pressure pad can completely cover the surface of the composite material preformed part;
3) packaging: packaging the composite material preformed part and the simple flexible pressure equalizing pad in the step 2) together, and tightly attaching the simple flexible pressure equalizing pad to the surface of the composite material preformed part;
4) curing and forming: and (3) feeding the composite material preformed part packaged in the step 3) and the simple flexible pressure-equalizing pad into an autoclave together for hot pressing, solidifying and forming the composite material preformed part, taking out of the autoclave for cooling, and uncovering and demoulding the simple flexible pressure-equalizing pad to obtain the formed composite material part.
As a preferable technical solution, in the step 2), the splicing is performed by using a pressure sensitive adhesive tape.
As a preferable technical scheme, in the step 3), the packaging is that the simple flexible uniform pressure pad and the composite material pre-molded part are subjected to vacuum packaging on a composite material part forming mold bottom plate by using a vacuum bag and a sealing rubber strip, and an air guide material is laid before packaging.
The utility model has the advantages that:
compare in traditional pressure pad, the utility model discloses simple and easy flexible voltage-sharing pad simple structure, cost of manufacture are low, preparation cycle is short, just the utility model discloses the flexibility of simple and easy flexible voltage-sharing pad is better than pressure pad, and it is good with combined material part matching degree in supplementary forming process, has guaranteed the surface smoothness degree after the combined material part shaping better.
Drawings
FIG. 1 is a schematic view of the simple flexible pressure-equalizing pad of the present invention;
fig. 2 is a schematic view of the simple and easy flexible uniform pressure pad and composite material part packaging structure of the present invention.
In the figure: 1. demolding the cloth layer; 2. a fiber cloth layer; 3. a simple flexible pressure equalizing pad; 4. a composite material preform part; 5. vacuum bag; 6. sealing rubber strips; 7. forming a die bottom plate of the composite material part; 8. an air guide material.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art without any creative work based on the present embodiment belong to the protection scope of the present invention.
Example 1
The simple and easy flexible pressure-equalizing pad and the forming device for hot press forming of the composite material comprise a demolding cloth layer 1 and a fiber cloth layer 2, wherein the demolding cloth layer 1 is paved and attached on the fiber cloth layer 2 to form the simple and easy flexible pressure-equalizing pad 3, as shown in figure 1. The release cloth layer 1 is single-sided adhesive PTFE release cloth, and the adhesive surface of the release cloth layer is paved and adhered on the fiber cloth layer 2; the fiber cloth used by the fiber cloth layer 2 is dry polyester strippable cloth. In some embodiments, a single polyester strippable cloth can be directly covered on the prepreg of the composite material part, but the polyester strippable cloth can easily adsorb resin, so that the thickness of the formed part is reduced, and the qualification rate of the composite material part is reduced.
When the simple and flexible uniform pressure pad for hot press molding of the composite material is manufactured, firstly, fiber cloth slightly larger than the size of a part is cut according to the size of the part of the composite material, if the width of the fiber cloth is smaller than that of the part, a plurality of pieces of fiber cloth can be cut to ensure that the fiber cloth can completely cover the surface of the part, one surface of the fiber cloth is paved with a layer of demolding cloth, and when paving, the wrinkles are removed by paying attention, so that the uniform pressure pad can be manufactured.
When the simple flexible pressure equalizing pad is used for carrying out hot press molding on the composite material, the device comprises the simple flexible pressure equalizing pad 3, a composite material part molding die bottom plate 7 and a sealing material; the composite material part forming die bottom plate 7 is provided with a composite material preformed part 4, and the simple flexible pressure-equalizing pad 3 is pressed on the composite material preformed part 4; the sealing material comprises a vacuum bag 5 and a sealing rubber strip 6, the vacuum bag 5 covers the simple flexible uniform pressure pad 3, the sealing rubber strip 6 enables the vacuum bag 5 to be attached to a composite material part forming mold bottom plate 7 around the composite material preforming part 4, and therefore the simple flexible uniform pressure pad 3 compacts the composite material preforming part 4 and packages the simple flexible uniform pressure pad and the composite material preforming part on the composite material part forming mold bottom plate 7.
Example 2
The embodiment provides an application of the simple and flexible pressure equalizing pad in embodiment 1, which is mainly used for assisting a composite material part autoclave molding process, and comprises the following steps:
1) covering a pressure equalizing pad: one surface of a demoulding cloth layer 1 of the simple and flexible pressure equalizing pad 3 in the embodiment 1 is downwards paved and covered on a composite material preformed part 4;
2) shearing and splicing: according to the molded surface and the size of the composite material preformed part 4, the simple flexible pressure-equalizing pad 3 in the step 1 is cut at the corner, the curvature change area and other positions of the part, and is spliced and fixed by using a pressure-sensitive adhesive tape, so that the surface of the composite material preformed part 4 can be completely covered by the simple flexible pressure-equalizing pad 3;
3) packaging: packaging the composite material preformed part 4 and the simple flexible pressure-equalizing pad 3 in the step 2 on a composite material part forming mold bottom plate 7 together by using a vacuum bag 5 and a sealing rubber strip 6, as shown in figure 2; meanwhile, the simple flexible uniform pressure pad 3 is tightly attached to the surface of the composite material preformed part 4. In some embodiments, a layer of polyester fiber air guide felt can be further laid as the air guide material 8 before encapsulation, so that volatile gas generated inside and interlayer residual air are led out during the curing process of the workpiece, and the product quality of the workpiece is ensured.
4) Curing and forming: and (3) feeding the composite material preformed part 4 packaged in the step (3) and the simple flexible pressure-equalizing pad 3 into an autoclave for hot pressing, solidifying and forming the composite material preformed part 4, taking out of the autoclave for cooling, and uncovering and demoulding the simple flexible pressure-equalizing pad 3 to obtain the formed composite material part.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Furthermore, it should be understood that the above description is only one preferred embodiment of the present invention, and is not intended to limit the present invention in any way, as those skilled in the art may make modifications and variations of the present invention using the above-described technical disclosure. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a simple and easy flexible pressure equalizing pad for combined material hot briquetting which characterized in that: including drawing of patterns cloth layer (1) and fibre cloth layer (2), drawing of patterns cloth layer (1) is spread and is pasted and form simple and easy flexible even pressure pad (3) on fibre cloth layer (2).
2. The simple flexible pressure equalizing pad for hot press molding of composite materials as claimed in claim 1, wherein: the demolding cloth layer (1) is PTFE demolding cloth with glue on one side, and the surface with the glue is paved and adhered on the fiber cloth layer (2).
3. The simple flexible pressure equalizing pad for hot press molding of composite materials as claimed in claim 1, wherein: the fiber cloth layer (2) is made of dry polyester strippable cloth.
4. A composite material hot press molding device containing the simple flexible uniform pressure pad as claimed in any one of claims 1 to 3, characterized in that: comprises a simple flexible pressure-equalizing pad (3), a composite material part forming die bottom plate (7) and a sealing material; the composite material part forming die bottom plate (7) is provided with a composite material preformed part (4), and the simple flexible pressure-equalizing pad (3) is pressed on the composite material preformed part (4); the sealing material comprises a vacuum bag (5) and a sealing rubber strip (6), the vacuum bag (5) covers the simple flexible pressure equalizing pad (3), and the sealing rubber strip (6) pastes the vacuum bag (5) on a composite material part forming mold bottom plate (7) around the composite material preforming part (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922074130.0U CN211942188U (en) | 2019-11-27 | 2019-11-27 | Simple flexible pressure equalizing pad for hot press molding of composite material and molding device |
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| CN201922074130.0U CN211942188U (en) | 2019-11-27 | 2019-11-27 | Simple flexible pressure equalizing pad for hot press molding of composite material and molding device |
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| CN211942188U true CN211942188U (en) | 2020-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110815867A (en) * | 2019-11-27 | 2020-02-21 | 航天海鹰(镇江)特种材料有限公司 | Simple flexible pressure equalizing pad for hot press molding of composite material and application thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110815867A (en) * | 2019-11-27 | 2020-02-21 | 航天海鹰(镇江)特种材料有限公司 | Simple flexible pressure equalizing pad for hot press molding of composite material and application thereof |
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