CN111688237A - Forming method of tubular composite material part with two closed ends - Google Patents
Forming method of tubular composite material part with two closed ends Download PDFInfo
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- CN111688237A CN111688237A CN202010579025.7A CN202010579025A CN111688237A CN 111688237 A CN111688237 A CN 111688237A CN 202010579025 A CN202010579025 A CN 202010579025A CN 111688237 A CN111688237 A CN 111688237A
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- tubular
- mold
- composite part
- fusible
- vacuum bag
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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
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/20—Opening, closing or clamping
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Abstract
The invention relates to a method for forming a tubular composite part with two closed ends, which comprises the steps of firstly forming a tubular meltable mold in an auxiliary mold cavity formed by combining an upper mold and a lower mold in a tubular shape, wherein the outer profile of the auxiliary mold cavity is the same as the inner profile of the tubular composite part. Then, a tubular composite part with two closed ends is prepared by a tubular fusible mold, the tubular fusible mold is softened and then demolded by heating after the tubular composite part is molded, and demolding is realized by utilizing the glass transition temperature difference between the tubular fusible mold and the tubular composite part, so that a metal combined mold is avoided, the manufacturing cost and the manufacturing difficulty of the mold are reduced, the thermoplastic plastic used by the fusible mold has the characteristic of being recyclable and can be reused, and the method has the characteristics of simplicity and convenience in operation, low cost and the like.
Description
Technical Field
The invention relates to the technical field of manufacturing of tubular special-shaped composite parts, in particular to a method for forming a tubular composite part with two closed ends.
Background
The resin-based composite material is widely applied to the fields of aerospace and the like, the application structure is more and more complex, and the columnar composite material parts are used as a main structural form to replace the structures such as a strut, a frame and the like of the traditional metal structure so as to reduce the structural weight. The columnar composite structure includes: the hollow tubular structure is a type of form which is widely applied in the aerospace field, but the structural member is designed and manufactured in a male mold form in design and manufacture, so that the hollow tubular structure is required to have a certain mold drawing angle to enable a part to be demoulded. The closed-angle tubular composite part has a closed-up phenomenon at one end or two ends, when the part is manufactured, the mold is required to be designed into a block form, before the part is manufactured, the molds are firstly combined, and demolding is carried out after solidification, so that the mold design is complex, and the molding efficiency is low. Another common structure of a tubular composite part with closed ends at both ends is to fill a low-density foam core material in the middle, wherein the foam core material is not taken out after the composite tubular part is cured and remains in the middle of the part, and the structure has the following defects: 1) the weight of the composite material part is increased; 2) the material cost and the processing cost of the foam core are increased, so that the overall cost of the composite part is higher.
Therefore, the invention provides a method for forming a tubular composite part with two closed ends, which solves the problem that the tubular composite part with two closed ends is difficult to demould and the closed angle and two closed ends are difficult to demould. The method comprises the steps of manufacturing a thin-wall fusible male die by utilizing a thermoplastic sheet, paving and pasting a solidified tubular composite part on the male die, and realizing demoulding by utilizing the glass transition temperature difference between the fusible male die and the composite part.
Disclosure of Invention
(1) Technical problem to be solved
The invention provides a method for forming a tubular composite part with two closed ends, which solves the problem that the tubular composite part with two closed ends is difficult to demould.
(2) Technical scheme
The embodiment of the invention provides a method for forming a tubular composite part with two closed ends, which comprises the following steps:
step S110, attaching a plastic sheet to the inner wall of a cavity of an auxiliary mold, and then placing demolding cloth on the surface of the plastic sheet for manufacturing a tubular fusible mold, wherein the cavity of the auxiliary mold is of a tubular structure with two closed ends, and the outer profile of the cavity of the auxiliary mold is the same as the inner profile of a tubular composite part to be formed;
step S120, a tubular vacuum bag penetrates through the middle cavity of the auxiliary mold and is sealed outside the auxiliary mold, the finished integral assembly is placed in an oven and heated to the melting point of the plastic sheet, the plastic sheet is bonded together after being melted, after the integral assembly is cooled, the tubular vacuum bag and the demolding cloth are removed, the auxiliary mold is opened, and the manufactured tubular fusible mold with two closed ends is taken out;
step S130, respectively placing a front sealing cover and a rear sealing cover on the closing-in ports at two ends of the tubular fusible mold, tightly clamping and sealing the tubular fusible mold and the sealing covers by using a hoop, connecting a vent and a valve on the front sealing cover, filling high-pressure gas into the tubular fusible mold through the valve of the front sealing cover, and closing the valve;
step S140, paving prepreg on the outer surface of the tubular fusible mold according to a preset paving layer to form a tubular composite part blank, opening a valve to discharge internal high-pressure gas after paving, and removing a front sealing cover, a rear sealing cover and a hoop;
s150, placing demolding cloth and a vacuum bag on the surface of the tubular composite part blank, enabling the tubular vacuum bag to penetrate through a middle cavity of the tubular fusible mold, placing a vacuum nozzle in the tubular vacuum bag, bonding the vacuum bag on the surface of the tubular composite part blank and the penetrating tubular vacuum bag by using a sealing adhesive tape, vacuumizing, and then placing the tubular composite part blank into an autoclave to be cured according to a prepreg process;
and S160, removing the vacuum bag, the demolding cloth and the tubular vacuum bag in the middle cavity on the surface of the tubular composite part blank, putting the tubular fusible mold and the tubular composite part on the outer surface into an oven, heating to the glass transition temperature of the plastic sheet to soften the tubular fusible mold, pulling out the softened tubular fusible mold from the tubular composite part, and finally obtaining the tubular composite part with two closed ends.
Further, in the step S110, the material of the plastic sheet is a thermoplastic material, the glass transition temperature of the plastic sheet material is higher than the curing temperature of the prepreg in the step S140, and the glass transition temperature is lower than the glass transition temperature of the prepreg after curing.
Further, the material of the plastic sheet is polycarbonate material.
Further, in the step S120, the wall thickness of the manufactured tubular fusible mold is not more than 5 mm.
Further, in step S130, after the high-pressure gas is filled into the tubular fusible mold, the deformation of the outer surface profile of the tubular fusible mold in the normal direction is less than 0.6 mm.
Further, in step S110, the auxiliary mold includes an upper mold and a lower mold having a symmetrical structure, at least two pairs of positioning and locking threaded holes are symmetrically formed at the mold closing positions of both ends of the upper mold and the lower mold, and before step S120, a locking bolt needs to penetrate through the positioning and locking threaded holes for locking, so that the upper mold and the lower mold are closed to form a complete auxiliary mold.
Further, in step S120, after the whole assembly is cooled, the tubular vacuum bag and the release cloth are removed, and the auxiliary mold is opened by removing the locking bolt, so as to take out the manufactured tubular fusible mold.
(3) Advantageous effects
In conclusion, the characteristic that the tubular fusible mold becomes soft at a certain temperature is utilized, the problem that the tubular composite part with two closed ends is difficult to demold after being molded is solved, and by the molding method, demolding can be realized only by heating to soften the tubular fusible mold after the part is cured and molded, and the molding method is simple and easy to operate. And when the prepreg of the composite material is paved at room temperature, the existence of high-pressure gas in the fusible mold ensures the rigidity of the mold, and ensures that the external surface of the part has enough precision. Meanwhile, the use of a metal combined die is avoided, the manufacturing cost and the manufacturing difficulty of the die are reduced, and the thermoplastic sheet used by the meltable die has the characteristic of being recyclable and can be reused. Therefore, the method has the characteristics of simple and convenient operation, low cost and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic longitudinal cross-sectional view of a tubular composite part according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a tubular composite part.
Figure 3 is a schematic view of a tubular meltable mold manufacturing assembly.
FIG. 4 is a schematic cross-sectional view of upper and lower mold locks for making a tubular meltable mold.
FIG. 5 is a schematic view of a green body manufacturing assembly for a tubular composite part.
Figure 6 is a schematic view of the closure locking.
In the figure:
1-a tubular composite part; 2, mounting a mold; 3-lower mould; 4-a tubular meltable mold; 23-angle marker post; 3-polishing the bracket; 4-vacuum box; 5-locking bolts of the mold; 6-a tubular composite part blank; 7-rear sealing cover; 8-front sealing cover; 9-a valve; 10-clamping a hoop; 11-clip locking bolt.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1 to 6, an embodiment of the present invention provides a method for forming a tubular composite part with two closed ends. The forming method is that a tubular meltable mold 4 is formed in an auxiliary mold cavity formed by combining an upper mold 2 and a lower mold 3 in a tubular shape, and the outer profile of the cavity of the auxiliary mold is the same as the inner profile of a tubular composite material part 1. Then, the tubular composite part 1 with two closed ends is prepared by the tubular fusible mold 4, the tubular fusible mold 4 is softened and then demolded by heating after the tubular composite part 1 is molded, and demolding is realized by utilizing the glass transition temperature difference between the tubular fusible mold 4 and the tubular composite part 1, so that a metal combined mold is avoided, the manufacturing cost and the manufacturing difficulty of the mold are reduced, the thermoplastic plastic used by the fusible mold has the characteristic of recoverability and can be repeatedly used, and the method has the characteristics of simplicity and convenience in operation, low cost and the like.
The specific operation steps of the forming method of the tubular composite material part with two closed ends at least comprise the following steps of S110-S160:
step S110, attaching a plastic sheet made of polycarbonate material to the inner wall of a cavity of an auxiliary mold, and then placing demolding cloth on the surface of the plastic sheet for manufacturing a tubular fusible mold, wherein the cavity of the auxiliary mold is of a tubular structure with two closed ends, and the outer profile of the cavity of the auxiliary mold is the same as the inner profile of a tubular composite part to be formed.
It should be noted that the auxiliary mold includes an upper mold 2 and a lower mold 3 having a symmetric structure, at least two pairs of mold locking bolts 5 are symmetrically disposed at the mold closing positions of the two ends of the upper mold 2 and the lower mold 3, and before step S120, the mold locking bolts 5 need to penetrate into the positioning locking threaded holes for locking, so that the upper mold and the lower mold are closed to form a complete auxiliary mold.
In the plastic sheet in this example, the tubular fusible mold 4 is made of a polycarbonate material, the glass transition temperature of the polycarbonate material is 145 ℃, the melting point temperature is 230 ℃, the curing temperature of the prepreg used for the tubular composite part 1 is 125 ℃, and the glass transition temperature after curing is 155 ℃.
And step S120, a tubular vacuum bag penetrates through a middle cavity of an auxiliary mold for closing the upper mold 2 and the lower mold 3 and is sealed outside the auxiliary mold (the upper mold 2 and the lower mold 3), the finished integral assembly is placed in an oven and heated to the melting point (230 ℃) of the plastic sheets, the plastic sheets are bonded together after being melted, after the integral assembly is cooled, the tubular vacuum bag and the demolding cloth are removed, the upper mold 2 and the lower mold 3 are separated through a mold locking bolt 5, the auxiliary mold is opened, and the manufactured tubular fusible mold 4 with two closed ends is taken out. The wall thickness of the fabricated tubular meltable mold should be no greater than 5 mm.
Step S130, respectively placing a front sealing cover 8 and a rear sealing cover 7 on the closing-in of two ends of the tubular fusible mold 4, tightly clamping and sealing the tubular fusible mold 4 and the sealing covers (the front sealing cover 8 and the rear sealing cover 7) by using a hoop 10 and a hoop locking bolt 11, connecting a vent and a valve 9 on the front sealing cover 8, filling high-pressure gas of 0.2MPa into the tubular fusible mold 4 through the valve 9 of the front sealing cover 8, and closing the valve 9. After high-pressure gas is filled into the tubular fusible mold 4, the deformation of the molded surface of the outer surface of the tubular fusible mold 4 in the normal direction needs to be ensured to be less than 0.6 mm.
Step S140, paving prepreg on the outer surface of the tubular fusible mold 4 according to a preset paving layer to form a tubular composite part blank 6, opening the valve 9 to exhaust internal high-pressure gas after paving, and removing the front sealing cover 8, the rear sealing cover 9 and the hoop 10.
Step S150, placing demolding cloth and a vacuum bag on the surface of the tubular composite part blank 6, penetrating the demolding cloth and the vacuum bag through the middle cavity of the tubular fusible mold 4 by using the tubular vacuum bag, placing a vacuum nozzle in the tubular vacuum bag, bonding the vacuum bag on the surface of the tubular composite part blank 6 and the penetrating tubular vacuum bag by using a sealing rubber strip, vacuumizing, placing the vacuum bag in an autoclave, and curing at 125 ℃ according to a prepreg process.
It should be noted that the vacuum bag and the tubular vacuum bag are different in shape and same in material, and the vacuum bag penetrating through the middle of the tubular fusible mold is tubular; and the outer surface of the blank body is provided with a common film-shaped vacuum bag.
Step S160, removing the vacuum bag, the demolding cloth and the tubular vacuum bag of the middle cavity on the surface of the tubular composite part blank, putting the tubular fusible mold 4 and the tubular composite part 1 on the outer surface into an oven, heating to 145 ℃ of the glass transition temperature of the plastic sheet, softening the tubular fusible mold 4, pulling out the softened tubular fusible mold 4 from the tubular composite part 1, and finally obtaining the tubular composite part 1 with two closed ends.
In specific implementation, the prepreg material may be epoxy-based carbon fiber, glass fiber, or other fiber prepreg, or bismaleimide-based prepreg, which is not limited in the present invention.
The plastic sheet material used for producing the tubular fusible mold is required to have a glass transition temperature higher than the curing temperature of the prepreg and a glass transition temperature lower than the glass transition temperature of the prepreg after curing. The forming method can realize simple and convenient forming of the tubular composite material part with two closed ends. The foregoing is merely exemplary of the present application and is not intended to be limiting thereof, and a detailed description of known process techniques is omitted herein for the sake of brevity. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. A method for forming a tubular composite part with two closed ends is characterized by comprising the following steps:
step S110, attaching a plastic sheet to the inner wall of a cavity of an auxiliary mold, and then placing demolding cloth on the surface of the plastic sheet for manufacturing a tubular fusible mold, wherein the cavity of the auxiliary mold is of a tubular structure with two closed ends, and the outer profile of the cavity of the auxiliary mold is the same as the inner profile of a tubular composite part to be formed;
step S120, a tubular vacuum bag penetrates through the middle cavity of the auxiliary mold and is sealed outside the auxiliary mold, the finished integral assembly is placed in an oven and heated to the melting point of the plastic sheet, the plastic sheet is bonded together after being melted, after the integral assembly is cooled, the tubular vacuum bag and the demolding cloth are removed, the auxiliary mold is opened, and the manufactured tubular fusible mold with two closed ends is taken out;
step S130, respectively placing a front sealing cover and a rear sealing cover on the closing-in ports at two ends of the tubular fusible mold, tightly clamping and sealing the tubular fusible mold and the sealing covers by using a hoop, connecting a vent and a valve on the front sealing cover, filling high-pressure gas into the tubular fusible mold through the valve of the front sealing cover, and closing the valve;
step S140, paving prepreg on the outer surface of the tubular fusible mold according to a preset paving layer to form a tubular composite part blank, opening a valve to discharge internal high-pressure gas after paving, and removing a front sealing cover, a rear sealing cover and a hoop;
s150, placing demolding cloth and a vacuum bag on the surface of the tubular composite part blank, enabling the tubular vacuum bag to penetrate through a middle cavity of the tubular fusible mold, placing a vacuum nozzle in the tubular vacuum bag, bonding the vacuum bag on the surface of the tubular composite part blank and the penetrating tubular vacuum bag by using a sealing adhesive tape, vacuumizing, and then placing the tubular composite part blank into an autoclave to be cured according to a prepreg process;
and S160, removing the vacuum bag, the demolding cloth and the tubular vacuum bag in the middle cavity on the surface of the tubular composite part blank, putting the tubular fusible mold and the tubular composite part on the outer surface into an oven, heating to the glass transition temperature of the plastic sheet to soften the tubular fusible mold, pulling out the softened tubular fusible mold from the tubular composite part, and finally obtaining the tubular composite part with two closed ends.
2. The method of forming a two-end-necked tubular composite part according to claim 1, wherein in the step S110, the plastic sheet is made of a thermoplastic material, the glass transition temperature of the plastic sheet is higher than the curing temperature of the prepreg in the step S140, and the glass transition temperature is lower than the glass transition temperature of the prepreg after curing.
3. The method of claim 2, wherein the plastic sheet is formed of polycarbonate.
4. The method of claim 1, wherein in step S120, the wall thickness of the fabricated tubular fusible mold is not greater than 5 mm.
5. The method for forming a tubular composite part with two closed ends according to claim 1, wherein in the step S130, after the high-pressure gas is filled into the interior of the tubular fusible mold, the deformation of the molded surface of the outer surface of the tubular fusible mold in the normal direction is less than 0.6 mm.
6. The method for forming a tubular composite part with two closed ends according to claim 1, wherein in the step S110, the auxiliary mold comprises an upper mold and a lower mold which have a symmetrical structure, at least two pairs of positioning and locking threaded holes are symmetrically formed at the closing positions of the two ends of the upper mold and the lower mold, and before the step S120, the upper mold and the lower mold are closed to form a complete auxiliary mold by inserting locking bolts into the positioning and locking threaded holes and then locking.
7. The method of claim 6, wherein in step S120, after the integral assembly is cooled, the tubular vacuum bag and the release fabric are removed, the auxiliary mold is opened by removing the locking bolt, and the manufactured tubular fusible mold is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010579025.7A CN111688237A (en) | 2020-06-23 | 2020-06-23 | Forming method of tubular composite material part with two closed ends |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010579025.7A CN111688237A (en) | 2020-06-23 | 2020-06-23 | Forming method of tubular composite material part with two closed ends |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113619132A (en) * | 2021-08-25 | 2021-11-09 | 上海复合材料科技有限公司 | Common-bottom glue joint method suitable for panel foam sandwich heat-insulation storage box and heat-insulation storage box |
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Application publication date: 20200922 |