CN109571992B - Processing method of fiber reinforced composite material connecting piece - Google Patents
Processing method of fiber reinforced composite material connecting piece Download PDFInfo
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- CN109571992B CN109571992B CN201811394723.9A CN201811394723A CN109571992B CN 109571992 B CN109571992 B CN 109571992B CN 201811394723 A CN201811394723 A CN 201811394723A CN 109571992 B CN109571992 B CN 109571992B
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- umbrella
- processed
- rectangular supporting
- shaped adhesive
- adhesive sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
Abstract
The invention relates to a processing method of a fiber reinforced composite material connecting piece, and belongs to the field of material mechanics tests. The processing method comprises the following steps: cutting the sheet-shaped fiber cloth into two groups of umbrella-shaped adhesive sheets, wherein each umbrella-shaped adhesive sheet consists of a rectangular supporting part at the middle part and connecting arms which are laterally symmetrically and obliquely extended, and a crease is processed at the middle part of the rectangular supporting part; the rectangular supporting part of each umbrella-shaped adhesive sheet is bent along the crease to form an included angle matched with the two connecting plates of the connecting piece to be processed, and the two connecting arms of each umbrella-shaped adhesive sheet are turned inwards to be vertical to the rectangular supporting part; and the two groups of umbrella-shaped sticking pieces are sequentially and symmetrically layered from inside to outside end to end, are placed into an assembly mold, are heated, cured and formed, and are machined to obtain the target product after the appearance and the connecting holes of the product are machined. The processing method provided by the invention has the advantages that the strength of the angle steel-shaped connecting piece processed by the fiber reinforced composite material meets the frame connection requirement, and the weight reduction of the frame of the built product is further realized.
Description
Technical Field
The invention relates to the field of manufacturing methods for composite material application, in particular to a processing method for a fiber reinforced composite material connecting piece.
Background
Fiber reinforced composites are used in a large number of aerospace, aircraft, racing car and other structures because of their light weight, high strength, designability, and ease of fabrication. With the reduction of the price and the increase of the yield of the fiber reinforced composite material, the fiber reinforced composite material is in the civil market at present, and is particularly applied to new energy automobiles, so that the weight of an automobile frame is reduced by more than 40%, the loading capacity of a battery is increased, and the endurance mileage is improved.
The processing method of the traditional fiber reinforced composite material at present comprises the following steps: cutting the flaky fiber cloth into a shape matched with the appearance of a product to be processed, and pasting the fiber cloth in a die layer by layer to form a solidified precursor matched with the thickness of the product; and then curing and molding the curing precursor at a certain temperature, and demolding to obtain a molded product. The traditional processing method of the fiber reinforced composite material is suitable for simple straight-surface or cambered-surface structures such as plate-shaped and barrel-shaped structures. When building a product frame from fibre-reinforced composite material, it is necessary to involve a construction in which several plate-like elements are angularly fixed. At present, two fiber reinforced composite boards with fixed angles are fixed by connecting through an angle steel connecting piece, and two connecting plates with connected angles of the angle steel are respectively fixed with a fiber reinforced composite board through screws. And a reinforcing rib is arranged between the two connecting plates which are connected in an angle. Because the complex structure like angle steel can not be processed in the traditional process, in order to ensure the connection strength, the traditional angle steel connecting piece is processed by metal materials, and the angle steel connecting piece becomes the difficulty of reducing weight when the fiber reinforced composite material builds a product frame.
Disclosure of Invention
The invention aims to solve the technical difficulty that only plate-shaped parts can be connected by angle steel when a product frame is built by adopting a fiber reinforced composite material in the traditional process, and provides a processing method of a fiber reinforced composite material connecting piece.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a processing method of a fiber reinforced composite material connecting piece, which comprises the following specific steps:
1) cutting sheet-shaped fiber cloth into two groups of umbrella-shaped adhesive sheets, wherein each umbrella-shaped adhesive sheet consists of a rectangular supporting part in the middle and connecting arms which symmetrically extend obliquely from one end of the rectangular supporting part to the other end; the length and the width of the rectangular supporting part of each umbrella-shaped adhesive sheet are matched with the total length and the width of the two connecting plates of the connecting piece to be processed, and the included angle formed by the connecting arm of each umbrella-shaped adhesive sheet and the rectangular supporting part is complementary with the included angle formed by the two connecting plates of the connecting piece to be processed; the middle part of each umbrella-shaped adhesive sheet rectangular supporting part is provided with a crease, and the distances from the crease of the two groups of umbrella-shaped adhesive sheet rectangular supporting parts to the fixed end of the connecting arm are equal;
2) the adopted mould comprises two supporting plates with fixed included angles in the middle and vertical side plates which are movably connected with the outer edges of the two sides of the two supporting plates respectively; the length and the width of the two supporting plates of the die are matched with those of the two connecting plates of the connecting piece to be processed, and the included angle formed by the two supporting plates of the die is matched with that formed by the two connecting plates of the connecting piece to be processed; the bottoms of the two vertical side plates are provided with connecting arm positioning blocks;
3) the rectangular supporting part of each umbrella-shaped adhesive sheet is bent along the crease to form an included angle matched with the two connecting plates of the connecting piece to be processed, and the two connecting arms of each umbrella-shaped adhesive sheet are turned inwards to be vertical to the rectangular supporting part; the two groups of umbrella-shaped sticking pieces are sequentially and symmetrically layered from inside to outside end to form a prepressing piece with the thickness matched with that of the connecting piece to be processed;
4) after the prepressing piece is placed in the inner cavity of the mold, the mold is assembled into a combined piece, the outer sides of the rectangular supporting parts stacked in the middle of the prepressing piece are attached to the inner walls of the two supporting plates of the mold, and the lower ends of the connecting arms symmetrically stacked on two sides of the prepressing piece are supported by the connecting arm positioning blocks;
5) sealing the mould, vacuumizing, heating, curing and molding;
6) and disassembling the mold, taking out the cured product, and machining the appearance and the connecting hole of the product to obtain the target product.
The fiber cloth is processed by adding one or more than one of the following fibers into a thermosetting resin matrix: carbon fiber, glass fiber, Kevlar fiber.
The curing and forming are carried out at the heating temperature of 120-125 ℃ and the heat preservation time is more than one hour.
Advantageous effects
The connecting block obtained by processing the angle steel-shaped connecting piece by the fiber reinforced composite material by the processing method has uniform stress distribution, large allowable stress range and high strength, meets the frame connection requirement, can reduce the weight by 40 percent in the same structure, and further realizes the weight reduction of a built product frame.
Drawings
FIG. 1 is a diagram of a fiber reinforced composite connector product;
figure 2 is a profile view of a first umbrella-shaped patch used in the embodiment;
figure 3 is a profile view of a second umbrella-shaped patch used in the embodiment;
FIG. 4 is a view of the head and tail symmetrical layer cementing process of two groups of umbrella-shaped stickers;
FIG. 5 is an overall view of the curing mold;
fig. 6 is a view showing the internal structure of the curing mold.
Detailed Description
The invention is further described with reference to the following figures and examples.
Examples
The invention relates to a processing method of a fiber reinforced composite material connecting piece, which comprises the following specific steps:
1) cutting the sheet-shaped fiber cloth into two groups of umbrella-shaped adhesive sheets, wherein each umbrella-shaped adhesive sheet consists of a rectangular supporting part in the middle and connecting arms which symmetrically extend obliquely from one end of the rectangular supporting part to the other end; the length and the width of the rectangular supporting part of each umbrella-shaped adhesive sheet are matched with the total length and the width of the two connecting plates of the connecting piece to be processed, and the included angle formed by the connecting arm of each umbrella-shaped adhesive sheet and the rectangular supporting part is complementary with the included angle formed by the two connecting plates of the connecting piece to be processed; the middle part of each umbrella-shaped adhesive sheet rectangular supporting part is provided with a crease, and the distances from the crease of the two groups of umbrella-shaped adhesive sheet rectangular supporting parts to the fixed end of the connecting arm are equal, as shown in figures 2 and 3;
2) as shown in fig. 5, the adopted mold comprises two support plates with a fixed included angle in the middle part and two vertical side plates which are movably connected with the outer edges of the two sides of the two support plates respectively; the length and the width of the two supporting plates of the die are matched with those of the two connecting plates of the connecting piece to be processed, and the included angle formed by the two supporting plates of the die is matched with that formed by the two connecting plates of the connecting piece to be processed; the bottoms of the two vertical side plates are provided with connecting arm positioning blocks as shown in figure 6;
3) the rectangular supporting part of each umbrella-shaped adhesive sheet is bent along the crease to form an included angle matched with the two connecting plates of the connecting piece to be processed, and the two connecting arms of each umbrella-shaped adhesive sheet are turned inwards to be vertical to the rectangular supporting part; the two groups of umbrella-shaped sticking pieces are sequentially and symmetrically layered from inside to outside end to form a prepressing piece matched with the thickness of the connecting piece to be processed, and the layering and sticking process is shown in figure 4;
4) after the prepressing piece is placed in the inner cavity of the mold, the mold is assembled into a combined piece, the outer sides of the rectangular supporting parts stacked in the middle of the prepressing piece are attached to the inner walls of the two supporting plates of the mold, and the lower ends of the connecting arms symmetrically stacked on two sides of the prepressing piece are supported by the connecting arm positioning blocks;
5) sequentially sheathing demolding cloth, an air felt and a vacuum bag outside the whole mold, sealing by using yellow glue, extracting vacuum, placing in an oven, heating to 120 ℃, preserving heat for one hour, and naturally cooling to room temperature;
6) and disassembling the mold, taking out the cured product, and machining the appearance and the connecting hole of the product to obtain the target product.
Claims (3)
1. A processing method of a fiber reinforced composite material connecting piece is characterized by comprising the following specific steps:
1) cutting sheet-shaped fiber cloth into two groups of umbrella-shaped adhesive sheets, wherein each umbrella-shaped adhesive sheet consists of a rectangular supporting part in the middle and connecting arms which symmetrically extend obliquely from one end of the rectangular supporting part to the other end; the length and the width of the rectangular supporting part of each umbrella-shaped adhesive sheet are matched with the total length and the width of the two connecting plates of the connecting piece to be processed, and the included angle formed by the connecting arm of each umbrella-shaped adhesive sheet and the rectangular supporting part is complementary with the included angle formed by the two connecting plates of the connecting piece to be processed; the middle part of each umbrella-shaped adhesive sheet rectangular supporting part is provided with a crease, and the distances from the crease of the two groups of umbrella-shaped adhesive sheet rectangular supporting parts to the fixed end of the connecting arm are equal;
2) the adopted mould comprises two supporting plates with fixed included angles in the middle and vertical side plates which are movably connected with the outer edges of the two sides of the two supporting plates respectively; the length and the width of the two supporting plates of the die are matched with those of the two connecting plates of the connecting piece to be processed, and the included angle formed by the two supporting plates of the die is matched with that formed by the two connecting plates of the connecting piece to be processed; the bottoms of the two vertical side plates are provided with connecting arm positioning blocks;
3) the rectangular supporting part of each umbrella-shaped adhesive sheet is bent along the crease to form an included angle matched with the two connecting plates of the connecting piece to be processed, and the two connecting arms of each umbrella-shaped adhesive sheet are turned inwards to be vertical to the rectangular supporting part; the two groups of umbrella-shaped sticking pieces are sequentially and symmetrically layered from inside to outside end to form a prepressing piece with the thickness matched with that of the connecting piece to be processed;
4) after the prepressing piece is placed in the inner cavity of the mold, the mold is assembled into a combined piece, the outer sides of the rectangular supporting parts stacked in the middle of the prepressing piece are attached to the inner walls of the two supporting plates of the mold, and the lower ends of the connecting arms symmetrically stacked on two sides of the prepressing piece are supported by the connecting arm positioning blocks;
5) sealing the mould, vacuumizing, heating, curing and molding;
6) and disassembling the mold, taking out the cured product, and machining the appearance and the connecting hole of the product to obtain the target product.
2. The method of claim 1, wherein the method further comprises the steps of: the fiber cloth is processed by adding one or more than one of the following fibers into a thermosetting resin matrix: carbon fiber, glass fiber, Kevlar fiber.
3. The method of claim 1, wherein the method further comprises the steps of: the curing and forming are carried out at the heating temperature of 120-125 ℃ and the heat preservation time of more than 1 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811394723.9A CN109571992B (en) | 2018-11-22 | 2018-11-22 | Processing method of fiber reinforced composite material connecting piece |
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|---|---|---|---|
| CN201811394723.9A CN109571992B (en) | 2018-11-22 | 2018-11-22 | Processing method of fiber reinforced composite material connecting piece |
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| CN109571992A CN109571992A (en) | 2019-04-05 |
| CN109571992B true CN109571992B (en) | 2020-05-29 |
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| CN112571823B (en) * | 2020-11-30 | 2022-07-22 | 江苏新扬新材料股份有限公司 | Composite material framework, forming die and forming method thereof |
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| GB2124130B (en) * | 1982-07-24 | 1985-11-27 | Rolls Royce | Vacuum moulding fibre reinforced resin |
| CN103465480B (en) * | 2013-08-23 | 2015-07-08 | 北京卫星制造厂 | Forming method of resin matrix composite reinforcing ribs |
| CN103963315B (en) * | 2014-05-29 | 2016-05-25 | 上海飞机制造有限公司 | A kind of prepreg/resin transfer moulding co-curing process of composite |
| CN105538747B (en) * | 2015-12-13 | 2018-01-09 | 吉林大学 | A kind of fiber reinforced polymer matrix composite T connector and preparation method thereof |
| WO2018198687A1 (en) * | 2017-04-28 | 2018-11-01 | 株式会社Ｓｕｂａｒｕ | Composite-material molding tool, composite-material molding method and composite material |
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