CN109228405B - Production die and production method of carbon fiber composite material T-shaped ring frame - Google Patents
Production die and production method of carbon fiber composite material T-shaped ring frame Download PDFInfo
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- CN109228405B CN109228405B CN201810915856.XA CN201810915856A CN109228405B CN 109228405 B CN109228405 B CN 109228405B CN 201810915856 A CN201810915856 A CN 201810915856A CN 109228405 B CN109228405 B CN 109228405B
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- 239000002131 composite material Substances 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 17
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Abstract
The invention belongs to a production technology of a T-shaped ring frame made of carbon fiber composite materials with complex molded surfaces, and particularly relates to a production die and a production method of the T-shaped ring frame made of carbon fiber composite materials. The production mould of carbon fiber composite material T type ring frame, it includes female mould and positive mould, the middle part of positive mould have annular die cavity, its characterized in that: and a soft mold which expands when heated is arranged in the annular cavity. The invention provides a production method which is relatively low in cost, simple and convenient in mould, high in efficiency and short in period, and the structural member produced by the method can completely reach the expected mechanical property.
Description
Technical Field
The invention belongs to a production technology of a T-shaped ring frame made of carbon fiber composite materials with complex molded surfaces, and particularly relates to a production die and a production method of the T-shaped ring frame made of carbon fiber composite materials.
Background
Molding methods based on thermosetting resin prepregs generally employ conventional processes for thermosetting composite materials. In order to further improve the efficiency and reduce the cost, a series of composite material liquid forming technologies (LCM), namely a vacuum assisted resin infiltration forming technology (VARI) technology and a resin film infiltration forming (RFI) technology, are developed. But the composite material parts such as round, rectangular section or special-shaped section hollow light-body components, special-shaped pipe fittings, non-round section hollow frames, frame beams, complex pipe fittings and the like which are changed along the component axis are long in process period, high in manufacturing cost and relatively complex.
The basic method of the vacuum pressure forming process is to lay and paste prepreg on a mold, lay and cover soft plastic film on the prepreg preform, and make it form a closed space with the mold, put the assembly into an oven, vacuumize the closed space while heating to form negative pressure, solidify. Since the vacuum pressure is at most 1atm, the prepreg volatiles easily generate bubbles and eventually form voids during curing. In addition, the R angle is easy to form a bridge, and the web is easy to delaminate. Therefore, the simple vacuum pressure forming is not suitable for forming T-shaped hollow frame-shaped members with precise size requirements, strict appearance and performance requirements.
Although a portion of the T-shaped hollow frame member may be formed using an autoclave process. But compared with autoclave forming, the vacuum bag forming equipment investment is low, the high energy consumption and the cost of expensive dies caused by autoclave forming are obviously reduced, and the method is a composite material low-cost forming process. Furthermore, the vacuum pressure forming process is not limited in component size by autoclave volume as in autoclave forming.
Disclosure of Invention
Aiming at the defects of the prior art, the invention designs a production die and a production method for a T-shaped hollow frame-type structural member made of a carbon fiber composite material with a complex molded surface and a variable cross section.
The technical scheme of the invention is as follows:
The production mould of carbon fiber composite material T type ring frame, it includes bed die and positive mould, the middle part of bed die have annular die cavity, its characterized in that: and a soft mold which expands when heated is arranged in the annular cavity.
The center of the soft mold is provided with a cavity, the cavity is internally provided with a central soft mold, and the expansion coefficient of the central soft mold is smaller than that of the soft mold.
A preparation method of a carbon fiber composite material T-shaped ring frame is characterized by comprising the following steps: the method comprises the following steps:
Step 1: the method comprises the steps of finishing the laying of a first composite material layer on a male die by using prepreg, and ensuring that the first composite material layer is tightly adhered and compacted;
Step 2: assembling the upper female die, finishing the laying of the second composite material layer, and ensuring the second composite material layer to be tightly adhered and compacted;
Step 3: removing the female die, and annularly paving a third composite material layer around the first composite material layer and the second composite material layer;
Step 4: the male die and the female die are assembled, and the soft die is arranged in an annular cavity of the female die;
Step 5: forming a vacuum bag outside the mold to form a closed space between the prepregs and the mold, and curing in an oven;
step 6: and after solidification, cooling the die to room temperature, and taking out the product.
In the baking oven curing process in the step 5, the vacuum pressure in the vacuum bag is always kept stable.
In the curing process of the oven, the heating rate of the oven is increased to 130 ℃ in 40 minutes, and the curing temperature is kept at 130 ℃ for 2 hours.
The invention has the beneficial effects that: according to the invention, the soft mold which is heated and expanded is arranged in the annular inner cavity of the female mold, and is expanded in the heating and solidifying process, so that the internal pressure is generated on the prepreg preform, the external pressure of the mold can be given to the preform through vacuum bag vacuumizing, the preform with a complex shape is tightly attached to the mold under the action of the internal pressure and the external pressure, the R angle and the web of the annular frame structural member are compacted, the product and the performance of the part are ensured, and the defect that the R angle size and the performance of the T-shaped variable cross-section hollow frame structural member cannot be considered in the forming process in the prior art is overcome.
Drawings
FIG. 1 is a schematic diagram of the structure of a male mold of the present invention;
FIG. 2 is a schematic diagram of the female die of the present invention;
FIG. 3 is a schematic diagram of the structure of the assembled female and male molds;
FIG. 4 is a shape and position of the first composite layer laid in the male mold;
FIG. 5 is a shape and position of the second composite layer laid in a mold;
FIG. 6 is a shape and position of a third composite layer laid in a mold;
fig. 7 is a schematic cross-sectional view of the female mold and male mold after the laying process.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the production mold of the carbon fiber composite material T-shaped ring frame comprises a male mold 1 and a female mold 2, wherein the middle part of the female mold 2 is provided with an annular cavity 20, and the production mold is characterized in that: the annular cavity is internally provided with a soft mold 3 which expands when heated.
According to the invention, the production die is improved, the soft die is arranged in the annular cavity of the female die, and the soft die is heated to expand in the drying and curing process, so that the prepreg prefabricated member is extruded in the expansion process, the prefabricated member with a complex shape can be more tightly attached to the die, the R angle and the web plate on the complex molded surface are compacted, and the appearance and the performance of the part are ensured.
The center of the soft mold 3 is provided with a cavity 30, a central soft mold 31 is arranged in the cavity 30, the expansion coefficient of the central soft mold 31 is smaller than that of the soft mold, and the central soft mold is small in expansion coefficient and basically does not deform; the expansion coefficient of the soft mold is larger than that of the central soft mold, the soft mold is prevented from being excessively expanded as a whole, further, the central soft mold is basically not deformed, the soft mold is expanded, the central soft mold can extrude the soft mold, the extrusion of the soft mold to the prepreg is ensured, and the problem of insufficient extrusion force to the prepreg caused by the expansion of the soft mold to the center is avoided.
A preparation method of a carbon fiber composite material T-shaped ring frame is characterized by comprising the following steps: the method comprises the following steps:
step 1: the laying of the first composite material layer 4 is completed on the male mould 1 by using prepreg, and the first composite material layer is tightly adhered and compacted; the female die is provided with a die cavity, the center of the die cavity is provided with a die core in a ring frame shape, the first composite material layer is paved on the side edge and the surface of the die core, the specific paving position and the specific shape are shown in figure 4,
Step 2: assembling the upper female die 2, finishing the laying of the second composite material layer 5, and ensuring the close compaction of the second composite material layer; as shown in fig. 5;
step 3: removing the female die, and annularly paving a third composite material layer 6 around the first composite material layer and the second composite material layer; by adopting the laying method, the structural reliability and strength between the T-shaped rib plate and the frame body are ensured, as shown in fig. 6;
step 4: after the male die and the female die are assembled, the soft die is arranged in an annular cavity of the female die, and after the male die and the female die are assembled, the male die and the female die are fixed through a fastener, so that the position stability between the male die and the female die is ensured, and the reliability of the shape and the accuracy of the size of a product are also facilitated; a sealing piece is not arranged between the female die and the male die, so that an overflow channel is provided for gas in the die, and the problem of gaps after the ring frame is solidified is prevented; as shown in figure 7 of the drawings,
Step 5: forming a vacuum bag outside the mold to form a closed space between the prepregs and the mold, and curing in an oven;
Step 6: after solidification, cooling the die to room temperature, removing the product to obtain a finished product, and performing post-treatment, wherein the post-treatment comprises cutting, deburring and the like;
In the baking oven curing process in the step 5, the vacuum pressure in the vacuum bag is always kept stable, so that the change of the shape of the product caused by the pressure change is avoided, and the precision of the shape of the product is ensured.
In the curing process of the oven, the heating rate of the oven is increased to 130 ℃ in 40 minutes, the curing temperature is kept at 130 ℃ for 2 hours, the curing process has larger influence on the stability of the product, the heating time is too short, the reaction of the epoxy resin in the prepreg is severe, bubbles are easy to generate, the product possibly has dense gaps to influence the quality of the product, otherwise, the heating time is too long, the fluidity of the epoxy resin is increased, the outflow of the epoxy resin in the prepreg is increased, and gaps caused by insufficient epoxy resin amount can easily occur in parts of the workpiece.
The invention has the beneficial effects that: according to the invention, the soft mold which is heated and expanded is arranged in the annular inner cavity of the female mold, and is expanded in the heating and solidifying process, so that the internal pressure is generated on the prepreg preform, the external pressure of the mold can be given to the preform through vacuum bag vacuumizing, the preform with a complex shape is tightly attached to the mold under the action of the internal pressure and the external pressure, the R angle and the web of the annular frame structural member are compacted, the product and the performance of the part are ensured, and the defect that the R angle size and the performance of the T-shaped variable cross-section hollow frame structural member cannot be considered in the forming process in the prior art is overcome.
The T-ring frame parts written in this embodiment are not the only special shapes, and the invention can be considered to be applicable to various processing techniques of composite materials such as round, T-section or special-section hollow lightweight components, special-shaped pipe fittings and non-round section hollow frames, frame beams and complex pipe fittings with R-angle, bending and torsion complex profiles and variable sections which are changed along the component axis.
Claims (4)
1. The production mould of carbon fiber composite material T type ring frame, it includes bed die and positive mould, the middle part of bed die have annular die cavity, its characterized in that: a soft mold which expands when heated is arranged in the annular cavity; the center of the soft mold is provided with a cavity, the cavity is internally provided with a central soft mold, and the expansion coefficient of the central soft mold is smaller than that of the soft mold.
2. A method for preparing a carbon fiber composite material T-shaped ring frame, which uses the production die of the carbon fiber composite material T-shaped ring frame as claimed in claim 1, and is characterized in that: the method comprises the following steps:
Step 1: the method comprises the steps of finishing the laying of a first composite material layer on a male die by using prepreg, and ensuring that the first composite material layer is tightly adhered and compacted;
Step 2: assembling the upper female die, finishing the laying of the second composite material layer, and ensuring the second composite material layer to be tightly adhered and compacted;
Step 3: removing the female die, and annularly paving a third composite material layer around the first composite material layer and the second composite material layer;
Step 4: the male die and the female die are assembled, and the soft die is arranged in an annular cavity of the female die;
Step 5: forming a vacuum bag outside the mold to form a closed space between the prepregs and the mold, and curing in an oven;
step 6: and after solidification, cooling the die to room temperature, and taking out the product.
3. The method for preparing the carbon fiber composite material T-shaped ring frame according to claim 2, which is characterized in that: in the baking oven curing process in the step 5, the vacuum pressure in the vacuum bag is always kept stable.
4. A method for preparing a T-shaped ring frame of a carbon fiber composite material according to claim 2 or 3, wherein: in the curing process of the oven, the heating rate of the oven is increased to 130 ℃ in 40 minutes, and the curing temperature is kept at 130 ℃ for 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915856.XA CN109228405B (en) | 2018-08-13 | Production die and production method of carbon fiber composite material T-shaped ring frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915856.XA CN109228405B (en) | 2018-08-13 | Production die and production method of carbon fiber composite material T-shaped ring frame |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109228405A CN109228405A (en) | 2019-01-18 |
| CN109228405B true CN109228405B (en) | 2024-07-02 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103434141A (en) * | 2013-08-15 | 2013-12-11 | 北京卫星制造厂 | Forming method for box-shaped carbon fiber composite reinforced structure |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103434141A (en) * | 2013-08-15 | 2013-12-11 | 北京卫星制造厂 | Forming method for box-shaped carbon fiber composite reinforced structure |
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