CN111113743A - Process and die for forming U-shaped composite material structural part with reinforcing ribs inside - Google Patents
Process and die for forming U-shaped composite material structural part with reinforcing ribs inside Download PDFInfo
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- CN111113743A CN111113743A CN202010014062.3A CN202010014062A CN111113743A CN 111113743 A CN111113743 A CN 111113743A CN 202010014062 A CN202010014062 A CN 202010014062A CN 111113743 A CN111113743 A CN 111113743A
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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
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
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- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to a process and a die for forming a U-shaped composite material structural member with reinforcing ribs inside. The process comprises the steps of providing a mould according to the shape and the size of the U-shaped composite structural member and co-curing and integrally forming the U-shaped composite structural body and the reinforcing ribs by using the mould. The U-shaped composite material structural member with the reinforcing ribs inside prepared by the process has good structural performance, does not need additional mechanical connection and cementing, is of a closed structure during molding, and cannot deform.
Description
Technical Field
The invention relates to a die and a process for forming a U-shaped composite material structural member with reinforcing ribs inside, and belongs to the composite material industry.
Background
U-shaped composite structural members with internal reinforcing ribs are very common in industrial applications, such as high-speed rail floor edge beams, magnetic levitation vehicle electromagnetic boxes, and subway door and window frames. The U-shaped composite material structural member with the reinforcing ribs inside is composed of a U-shaped composite material structural main body and the reinforcing ribs, wherein the reinforcing ribs are located between two side arms of the U-shaped composite material structural main body and divide the U-shaped composite material structural member into an upper part and a lower part. The reinforcing ribs are usually in an L shape and a T shape, and the structural schematic diagrams of the U-shaped composite structural member with the reinforcing ribs inside are respectively shown in fig. 1a and 1 b.
The forming process of the U-shaped composite material structural part with the reinforcing ribs inside mainly comprises the following modes: (1) the U-shaped structure composite material structure main body and the internal reinforcing ribs are riveted or glued after being respectively formed. The forming process has relatively simple dies, and the U-shaped composite material structure main body and the L-shaped or T-shaped reinforcing ribs can be formed separately and easily. However, the subsequent assembly increases the cost of the molding process because the processes of machining, assembling and gluing are required to be increased, and stress concentration is easily formed at the assembling position, and the mechanical property is poor. (2) The U-shaped composite material structure main body is formed and then the L-shaped or T-shaped reinforcing rib is formed on the U-shaped composite material structure main body, and the forming process is more suitable for a flat plate reinforcing structure. The reinforcing ribs of the U-shaped composite material structural main body are attached to the side walls of the U-shaped composite material structural main body, and from the design point of view, if the U-shaped composite material structural main body and the internal reinforcing ribs are integrally formed by co-curing, the structure of a mold is required to be complex, and the uniformity of pressure is difficult to realize in the forming process. According to the prior art, if the U-shaped composite structural member with the reinforcing ribs inside is prepared by using an autoclave molding process, two autoclave molding processes are required in the process: the first autoclave is used for forming the U-shaped composite material structure main body, and the second autoclave forming process is used for forming the reinforcing ribs. The manufacturing cost is increased in the two times of autoclave molding processes, the U-shaped non-closed structure is obtained by the first autoclave molding process, the chemical shrinkage is certain to generate deformation after the temperature is reduced, so that the product is separated from the mold, and when the reinforcing ribs are prepared by the second autoclave molding process, the added resin in the prepreg is pressed into the gap between the U-shaped composite material structure main body and the mold, so that the final product is difficult to demold, the outer surface of the product is uneven and the like.
Therefore, a process and a mold are needed for co-curing and integrally molding the U-shaped structural composite material main body and the internal reinforcing ribs.
Disclosure of Invention
Aiming at the problems in the forming process of the U-shaped composite material structural member with the reinforcing ribs inside in the prior art, the invention mainly aims to provide the forming process of the U-shaped composite material structural member with the reinforcing ribs inside.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a forming process of a U-shaped composite material structural part with reinforcing ribs inside comprises a U-shaped composite material structural main body and the reinforcing ribs, wherein two tail ends of the reinforcing ribs are connected to two side walls of the U-shaped composite material structural main body, and the forming method comprises the following steps:
(1) providing a die according to the shape and the size of the U-shaped composite material structural member, wherein the die comprises an upper die, a left lower die insert and a right lower die insert which form a lower film, and a die bottom plate,
the upper die comprises a cover plate and a downward-pointing lug, the left lower die insert and the right lower die insert are separated and respectively placed on the die bottom plate, and the lug can be placed in a space between the left lower die insert and the right lower die insert;
(2) according to the shape of the U-shaped composite material structural member, firstly, laying prepreg sheets for forming a U-shaped composite material structural body on the inner surfaces of the left lower die insert and the right lower die insert and on the surface of the die bottom plate between the left lower die insert and the right lower die insert, and then laying prepreg sheets for forming reinforcing ribs between the left lower die insert and the right lower die insert;
in this way, the prepreg sheets for forming the reinforcing ribs, the prepreg sheets for forming the two side walls below the reinforcing ribs of the U-shaped composite material structural body and the prepreg sheets for forming the bottom edge of the U-shaped composite material structural body form a closed frame; the prepreg sheets used for forming the reinforcing ribs and the prepreg sheets used for forming the reinforcing ribs of the U-shaped composite material structure main body are arranged on the two side walls to form an opening frame;
(3) a first demoulding cloth, a first isolating membrane, a first ventilated felt and an air pipe are sequentially paved in the closed frame,
the laying shape of the air pipe is matched with the shape of the closed area frame, so that the air pipe is free from being overhead at the corner;
(4) placing the upper die on the left lower die insert and the right lower die insert so that the bump is positioned in the opening frame, and then sequentially laying a second demolding cloth, a second isolating film, a second ventilated felt and a vacuum bag on a combined piece formed by the upper die and the left and right lower die inserts;
(5) ventilating an air pipe, vacuumizing a vacuum bag, and then conveying the mould into an autoclave to perform curing molding on the composite structural member.
In a preferred embodiment, in the process for forming a U-shaped composite structural member with internal reinforcing ribs according to the present invention, the prepreg sheet for forming the U-shaped composite structural body is laid in two layers, a first prepreg sheet is laid on the inner surfaces of the left and right lower mold inserts and the surface of the mold base plate between the left and right lower mold inserts, and a second prepreg sheet is laid on the first prepreg sheet.
In a preferred embodiment, in the step (2) of the molding process of the U-shaped composite structural member with reinforcing ribs inside according to the present invention, the laying of prepreg sheets for forming reinforcing ribs is performed during the laying of the second prepreg sheet.
In a preferred embodiment, in the process for forming the U-shaped structural member with internal reinforcing ribs according to the present invention, the materials of the U-shaped structural member and the reinforcing ribs are the same.
In a preferred embodiment, in the forming process of the U-shaped composite structural member with the reinforcing ribs inside, the main component material of the U-shaped composite structural member is carbon fiber, and the prepreg sheet for forming the composite structural member is an Dongli T700/ST007 resin system.
In a preferred embodiment, in the step (5) of the process for forming a U-shaped composite structural member with reinforcing ribs inside according to the present invention, before the start of the solidification forming of the U-shaped composite structural member (100), the air pressure to be introduced into the air duct (17) is 0.5 to 0.8MPa,
in a preferred embodiment, in the step (5) of the forming process of the U-shaped composite structural member with the reinforcing ribs inside according to the present invention, the internal pressure of the autoclave 20 during the curing and forming process is 0.5MPa to 0.8MPa, and the temperature is 130 ℃ to 135 ℃.
In a preferred embodiment, in the process for forming the U-shaped composite structural member with the reinforcing ribs inside according to the present invention, the mold further includes a slide block, during the forming process of the U-shaped composite structural member, the air pressure in the autoclave pushes the slide block to pressurize the opening frame, and the air pressure in the autoclave pressurizes the closing frame through the air duct.
The invention also provides a die for forming the U-shaped composite material structural part internally provided with the reinforcing ribs, wherein the U-shaped composite material structural part consists of a U-shaped composite material structural main body and the reinforcing ribs, two tail ends of the reinforcing ribs are connected to two side walls of the U-shaped composite material structural main body, and the die comprises an upper die, a left lower die insert and a right lower die insert which form a lower film, and a die bottom plate. The upper die comprises a cover plate and a downward-pointing lug, the left lower die insert and the right lower die insert are separated and are respectively positioned on the die bottom plate, the lug is placed in a space between the left lower die insert and the right lower die insert, and the cover plate is placed on the upper surfaces of the left lower die insert and the right lower die insert.
In a preferred embodiment, the upper die of the die for forming the U-shaped composite structural member with the reinforcing ribs inside is a frame structure, and the molded surface of the upper die has a certain thickness of 15-25 cm.
In a preferred embodiment, the lower die of the die for forming the U-shaped composite structural member with the reinforcing ribs inside is a frame structure, and the profile of the lower die has a certain thickness, wherein the thickness is 15-25 cm.
In a preferred embodiment, in the mold for forming a structural member of a U-shaped composite material with internal ribs according to the present invention, the upper surface of the mold base between the left lower mold insert and the right lower mold insert is a molding surface having a thickness of 15 to 25 cm.
In a preferred embodiment, the die for forming the U-shaped composite material structural part with the reinforcing ribs inside further comprises a sliding block, a first guide rail and a limiting block between the upper die and the sliding block,
the slider is used for exerting pressure on the die pressing area under the atmospheric pressure's of autoclave promotion in U type combined material structure piece forming process, and first guide rail is used for making the slider move along it, and the stopper is used for limiting the range of motion of slider.
In a preferred embodiment, the mold for forming the U-shaped composite structural member with the reinforcing ribs inside further comprises a mold frame for placing the mold bottom plate on, and the mold frame is provided with lifting rings, forklift holes and detachable universal wheels.
The forming process of the U-shaped composite material structural member with the reinforcing ribs inside adopts the autoclave, so that the U-shaped composite material structural body and the reinforcing ribs are co-cured and integrally formed without subsequent gluing or riveting, and the effects of high structural strength and good manufacturing cost and economy of the U-shaped composite material structural member with the reinforcing ribs inside are realized.
Therefore, compared with the prior art, the forming process of the U-shaped composite material structural part with the reinforcing ribs inside has the following advantages:
1. the U-shaped composite material structural body and the reinforcing ribs of the prepared U-shaped composite material structural member with the reinforcing ribs inside are integrally formed through co-curing, the structural performance is good, extra mechanical connection and bonding are not needed, and the U-shaped composite material structural member is of a closed structure and cannot deform during forming.
2. Good manufacturing economy: by adopting the modularized die and the co-curing autoclave process, the number of the used dies is small, the complexity of the die structure is low, the machining is not needed, and a tool clamp is not needed.
3. The air pipe and the vacuum bag are combined for use, so that the uniformity of pressure during one-step forming of the part is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a conventional U-shaped composite structural member with reinforcing ribs inside.
Fig. 2 is a schematic structural view of a U-shaped composite structural member with internal reinforcing ribs according to the present invention, wherein 100 denotes the U-shaped composite structural member with internal reinforcing ribs, 101 denotes a U-shaped composite structural body, and 102 denotes the reinforcing ribs.
Fig. 3 is a schematic view of the entire structure of the mold according to one embodiment of the present invention.
Fig. 4 is a longitudinal sectional view of the mold of fig. 3 taken along line a-a.
Fig. 5 is a schematic structural view of the mold of fig. 1 after bag making and before autoclave curing molding.
Fig. 6 is a schematic view of the upper half of the mold of fig. 5 in an autoclave.
In fig. 3-6, 1-upper die, 2-first guide rail, 4-slide block, 3-stopper, 5-lower die insert, 6-second guide rail, 7-die bottom plate, 8-die frame, 9-lifting ring, 10-forklift hole, 11-universal wheel, 12 ' -first stripping cloth, 13 ' -first isolation film, 14 ' -first air-permeable felt, 12-second stripping cloth, 13-second isolation film, 14-second air-permeable felt, 15-vacuum bag, 16-sealing rubber strip, 17-air pipe, 20-air pressure tank.
Detailed Description
In the description of the invention, the term "co-curing and integrally molding" means that the U-shaped composite material structural main body and the reinforcing ribs are simultaneously cured and molded in the autoclave to form a whole.
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Example 1
As shown in fig. 1, in this example, an internally ribbed U-shaped composite structural member 100 includes a U-shaped composite structural body 101 and ribs 102. The materials of the U-shaped composite material structure main body 101 and the reinforcing ribs 102 are the same. The prepreg sheet used to form the U-shaped composite structural member 100 was manufactured by Shanghai Jinfei Nissan composites, Inc., model number T700/ST 007.
As shown in fig. 3, in this embodiment, the mold for molding the U-shaped composite material structural member with the reinforcing ribs inside includes an upper mold 1, a first guide rail 2, a limiting block 3, a sliding block 4, a lower mold 5, a second guide rail 6, a mold bottom plate 7, a mold frame 8, a lifting ring 9, a forklift hole 10, and a universal wheel 11. As shown in fig. 4, in this embodiment, the upper mold 1 includes a cover plate and a downwardly directed projection mounted on a lower surface of the cover plate. The upper mold 1 may be a frame structure having a cover plate (e.g., about 10mm) with a certain thickness thereon to ensure heat transfer efficiency, and a profile region having a certain thickness (e.g., about 20mm) to meet the assembly requirements after the U-shaped composite structural member is formed. The width of the cover plate of the upper die 1 is larger than that of the bump. The first guide rail 2 is located between the upper moulds 1 and the slide 4 for moving the slide 4 in a fixed direction along the guide rail when pressed. The limiting block 3 is used for limiting the moving range of the sliding block 4. The slide 4 is adapted to slide when pressed to pressurize the molding area of the mold. The lower die 5 is composed of a left lower die insert 5a and a right lower die insert 5b, and is placed on the die base plate 7. The two lower die inserts are spaced at a certain distance. When the cover plate of the upper mold 1 is placed on the upper surfaces of the left and right lower mold inserts 5a and 5b, the projection of the upper mold 1 is located in the space between the left and right lower mold inserts 5a and 5 b. The molded surface areas of the left lower mold insert 5a and the right lower mold insert 5b have a certain thickness (for example, about 20mm), and both adopt a frame structure, so that the molded surface of the molded U-shaped composite material structural member meets the surface requirement and can be smoothly demolded. A second guide 6 is located between the lower mould insert 5 and the slide 4 for moving the slide 4 along the guide in a fixed direction when pressed (in cooperation with the guide 2, but in a different position). The die base plate 7 is placed on the die frame 8, and the surface thereof is connected to the left and right lower die inserts 5a and 5b, and the surface of the die base plate 7 between the left and right lower die inserts 5a and 5b forms a profile of the die base plate 7, which has a certain thickness (e.g., about 20 mm).
The mold shown in fig. 3 and 4 may further include a mold frame 8, the mold frame 8 may be made of steel with a certain thickness (e.g., 10mm) to ensure structural stability and uniform heat transfer of the mold, and the mold frame 8 may have a certain height (e.g., about 600mm) to make the operation height suitable. The mould frame 8 can be provided with a hanging ring 9 for providing a hanging part when the mould is carried by a travelling crane. The mold frame 8 may be provided with forklift holes 10 to provide insertion locations for the forks when the mold is handled by a forklift. The mould frame 8 can be provided with a detachable universal wheel 11, the mould can be moved when being installed on the mould frame 8, and when the mould is sent to an autoclave, the universal wheel 11 can be detached from the mould frame 8.
The process for preparing the U-shaped composite structural member with the reinforcing ribs inside shown in fig. 2 through the autoclave curing molding process by using the mold shown in fig. 3 and 2 comprises the following steps:
(1) preparing a mould: the upper die 1, the limiting block 3, the sliding block 4 and the lower die insert 5 of the die are disassembled and then cleaned by using a cleaning agent to remove oil stains, then an air-drying semi-permanent release agent is used for uniformly coating the inner surface of the die, high-temperature lubricating grease is coated in a bolt hole of the die, and finally the upper die 1, the limiting block 3, the sliding block 4 and the lower die insert 5 are arranged on a die bottom plate 7 and then are placed on the die bottom plate to be baked in an oven to be preheated to.
(2) According to the shape of the U-shaped composite material structure 100, firstly, a first prepreg sheet layer for forming the U-shaped composite material structure body 101 is paved on the inner surfaces of the left lower die insert 5a and the right lower die insert 5b and the inner surface of the die bottom plate 7, then a second prepreg sheet layer is paved on the first prepreg sheet layer, after the second prepreg sheet layer for forming the lower two side walls of the reinforcing ribs 102 of the U-shaped composite material structure body 101 and the second prepreg sheet layer for forming the bottom side of the U-shaped composite material structure body 101 are paved, a prepreg sheet layer for forming the reinforcing ribs 102 is paved, and then a second prepreg sheet layer for forming the upper two side walls of the reinforcing ribs (101) of the U-shaped composite material structure body (101) is paved;
in this way, the prepreg sheets for forming the reinforcing ribs 102, the prepreg sheets for forming the lower two side walls of the reinforcing ribs 102 of the U-shaped composite structural body 101, and the prepreg sheets for forming the bottom side of the U-shaped composite structural body 101 constitute a closed frame; the prepreg sheet for forming the reinforcing ribs 102 and the prepreg sheets on both side walls above the reinforcing ribs 102 for forming the U-shaped composite structural body 101 constitute an open frame.
The prepreg sheet for forming the reinforcing beads 102 has a certain hardness, and can be directly laid between the left and right lower mold inserts 5a and 5b without a support member.
(3) A first demoulding cloth 12 ', a first isolating film 13 ', a first ventilated felt 14 ' and an air pipe 17 are sequentially paved in the closed frame,
the laying shape of the air pipe 17 is matched with the shape of the closed area frame, the air pipe is laid along the inner surface of the closed area frame, the air pipe is free of overhead at the corner, sealing rubber strips are pasted at two ends of the air pipe when the air pipe is placed, and lining paper on the sealing rubber strips is not removed temporarily.
(4) Placing a cover plate of an upper die 1 on the upper surfaces of a left lower die insert 5a and a right lower die insert 5b, wherein a convex block of the upper die 1 is positioned in an opening frame, and the convex block plays the role of a core die in the forming process, and then laying a second demolding cloth 12, a second isolating film 13, a second ventilated felt 14 and a vacuum bag 15 in sequence on a combined piece formed by the upper die 1 and the left and right lower die inserts 5a, 5 b; a vacuum bag 15 is sealed to the upper surface of the mould base plate 7 using a sealing bead 16 (see figure 5).
(5) Ventilating the air pipe (17) with the ventilating air pressure of 0.6MPa, and vacuumizing the vacuum bag 15 with the vacuum degree of 0.1 MPa; and (3) removing the universal wheels 11 on the die, sending the die in the step (4) into an autoclave 20 for leak detection through a forklift hole 10 by using a forklift, and calling a curing and forming program for curing and forming if no air leakage occurs. In the process of curing and forming, the pressure in the autoclave 20 is 0.6MPa, and the temperature is 130-135 ℃. Thus, the air pressure inside the autoclave pushes the slider 4 to move along the first guide rail 2 to pressurize the open frame area (therefore, the open frame area is also referred to as a mold nip), and the air pressure inside the autoclave pressurizes the inner side wall of the closed frame (therefore, the closed frame area is also referred to as an air pressure area) in the closed frame area through the air duct 17 (see fig. 6).
According to the description, the method has the advantages that the U-shaped composite material structure main body of the U-shaped composite material structural member with the reinforcing ribs inside and the reinforcing ribs are co-cured and integrally formed, so that the structural performance is good, mechanical connection and bonding are not used, and the U-shaped composite material structural member is in a closed structure and cannot deform during forming; the process has the advantages that the number of the used dies is small, the structure of the dies is simple, machining is not needed, and a tool clamp is not needed; the manufacturing process is easy to control: the upper die and the lower die of the die are of frame structures, so that the heat transfer of the die is uniform, the temperature of all parts is uniformly increased and decreased when the U-shaped composite material structural member is formed, and the curing degree is consistent; the air pipe and the vacuum bag are combined for use, so that the uniformity of pressure during one-step forming of the part is ensured.
In addition, the die for forming the U-shaped composite material structural part with the reinforcing ribs inside is provided with a guide rail for guiding and pressurizing, a limiting block for limiting a sliding block, the guide rail is a die guide rail commonly used in the die market, the structure is modularized and easy to realize, and the limiting block can ensure the operation safety and reduce the measurement size work; and the upper die and the lower die of the die are of frame structures, so that the heat transfer of the die is uniform, the temperature of each part is uniformly increased and decreased during the forming of parts, and the curing degree is consistent.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (10)
1. The utility model provides a forming process of U type combined material structure of inside area strengthening rib, U type combined material structure comprises U type combined material main part (101) and strengthening rib (102), the two end connection of strengthening rib (102) are in on the both sides wall of U type combined material main part (101), its characterized in that: the molding method comprises the following steps:
(1) providing a die according to the shape and size of a U-shaped composite material structural member, wherein the die comprises an upper die (1), a left lower die insert (5a) and a right lower die insert (5b) which form a lower film (5), and a die bottom plate (7), the upper die (1) comprises a cover plate and a downward-pointing lug, and the left lower die insert (5a) and the right lower die insert (5b) are separated and are respectively placed on the die bottom plate (7).
(2) According to the shape of the U-shaped composite material structural part (100), laying prepreg sheets for forming a U-shaped composite material structural body (101) on the inner surfaces of a left lower die insert (5a) and a right lower die insert (5b) and the surface of a die bottom plate (7) between the left lower die insert (5a) and the right lower die insert (5b), and then laying prepreg sheets for forming reinforcing ribs (102) between the left lower die insert (5a) and the right lower die insert (5 b);
in this way, the prepreg sheets for forming the reinforcing ribs (102), the prepreg sheets for forming the lower two side walls of the reinforcing ribs (102) of the U-shaped composite material structural body (101) and the prepreg sheets for forming the bottom edge of the U-shaped composite material structural body (101) form a closed frame; the prepreg sheets for forming the reinforcing ribs (102) and the prepreg sheets for forming the reinforcing ribs (102) of the U-shaped composite material structure body (101) are arranged on the two side walls to form an opening frame;
(3) a first demoulding cloth (12 '), a first isolating film (13 '), a first ventilated felt (14 ') and an air pipe (17) are sequentially paved in the closing frame,
wherein the laying shape of the air pipe (17) is matched with the shape of the closed area frame, so that the air pipe is free from being overhead at the corner;
(4) placing the upper die (1) on the left lower die insert (5a) and the right lower die insert (5b) so that the bumps are positioned in the opening frame, and then sequentially laying a second release cloth (12), a second isolation film (13), a second airfelt (14) and a vacuum bag (15) on a combined piece formed by the upper die (1) and the left and right lower die inserts (5a, 5 b);
(5) ventilating an air pipe (17), vacuumizing a vacuum bag (15), and then conveying the mould into an autoclave (20) to perform curing molding on the composite material structural part (100).
2. The molding process according to claim 1, wherein in step (2), the prepreg sheet for forming the U-shaped composite structural body (101) is laid in two layers, a first layer of prepreg sheet is laid on the inner surfaces of the left and right lower mold inserts (5a, 5b) and on the surface of the mold base plate (7) between the left and right lower mold inserts (5a, 5b), and a second layer of prepreg sheet is laid on the first layer of prepreg sheet.
3. The moulding process according to claim 2, wherein in step (2) the laying up of the prepreg sheets for forming the reinforcing bars (102) is carried out during the laying up of the second layer of prepreg sheets.
4. The molding process according to claim 1, wherein the material of the U-shaped composite structural body (101) and the material of the reinforcing bars (102) are the same.
5. The molding process according to claim 4, wherein the main constituent material of the U-shaped composite structural member is carbon fiber, and the prepreg sheet for forming the U-shaped composite structural member is Dongli T700/ST007 resin system.
6. The molding process according to any one of claims 1 to 2, wherein in the step (5), the air pressure to the air duct (17) before the start of the solidification molding of the U-shaped composite structural member (100) is 0.5 to 0.8MPa, and the internal pressure of the autoclave 20 during the solidification molding is 0.5 to 0.8MPa at a temperature of 130 to 135 ℃.
7. The molding process according to claim 6, wherein the mold further comprises a slide block (4), and during the molding of the U-shaped composite structural member (100), the air pressure in the autoclave pushes the slide block (4) to pressurize the opening frame, and the air pressure in the autoclave pressurizes the closing frame through an air pipe (17).
8. The utility model provides a be used for inside fashioned mould of U type combined material structure (100) of taking strengthening rib, U type combined material structure comprises U type combined material structure main part (101) and strengthening rib (102), the two end connection of strengthening rib (102) are in on the both sides wall of U type combined material structure main part (101), its characterized in that: the die comprises an upper die (1), a left lower die insert (5a) and a right lower die insert (5b) which form a lower film (5), and a die bottom plate (7),
the upper die (1) comprises a cover plate and a downward-pointing lug, the left lower die insert (5a) and the right lower die insert (5b) are separated and are respectively positioned on the die bottom plate (7),
when the bump is placed in a space between the left and right lower mold inserts (5a, 5b), the cover plate is placed on the upper surfaces of the left and right lower mold inserts (5a, 5 b).
9. Mould according to claim 8, characterized in that it further comprises a slide (4), a first guide (2) and a stop (3)
The slide block (4) is used for pressing a mould pressing area of the mould under the pushing of the air pressure of the autoclave in the forming process of the U-shaped composite material structural member (100),
a first guide rail (2) is positioned between the upper die (1) and the slide block (4) for enabling the slide block (4) to move along the first guide rail,
the limiting block (3) is used for limiting the moving range of the sliding block (4).
10. Mould according to claim 8, characterized in that it further comprises a mould frame (8) for placing the mould bottom plate (7) on it, said mould frame (8) being provided with lifting eyes (9), forklift holes (10) and removable universal wheels (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014062.3A CN111113743A (en) | 2020-01-07 | 2020-01-07 | Process and die for forming U-shaped composite material structural part with reinforcing ribs inside |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014062.3A CN111113743A (en) | 2020-01-07 | 2020-01-07 | Process and die for forming U-shaped composite material structural part with reinforcing ribs inside |
Publications (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112720943A (en) * | 2020-12-15 | 2021-04-30 | 西安飞机工业（集团）有限责任公司 | Composite material forming die and transporting and stacking method thereof |
| CN112793182A (en) * | 2020-12-18 | 2021-05-14 | 江苏新扬新材料股份有限公司 | Composite material frame forming die for rack and forming method thereof |
| CN113459540A (en) * | 2021-06-25 | 2021-10-01 | 成都飞机工业（集团）有限责任公司 | Forming device and forming method for slender part with closed angle |
| CN114083815A (en) * | 2021-09-26 | 2022-02-25 | 中车青岛四方机车车辆股份有限公司 | Cross beam forming die, cross beam forming process and cross beam |
| WO2022134240A1 (en) * | 2020-12-26 | 2022-06-30 | 上海晋飞碳纤科技股份有限公司 | Mold for u-shaped composite product having deep cavity and super-thick wall |
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2020
- 2020-01-07 CN CN202010014062.3A patent/CN111113743A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112720943A (en) * | 2020-12-15 | 2021-04-30 | 西安飞机工业（集团）有限责任公司 | Composite material forming die and transporting and stacking method thereof |
| CN112793182A (en) * | 2020-12-18 | 2021-05-14 | 江苏新扬新材料股份有限公司 | Composite material frame forming die for rack and forming method thereof |
| WO2022134240A1 (en) * | 2020-12-26 | 2022-06-30 | 上海晋飞碳纤科技股份有限公司 | Mold for u-shaped composite product having deep cavity and super-thick wall |
| JP2023510988A (en) * | 2020-12-26 | 2023-03-16 | 上海晋飛▲たん▼繊科技股▲ふん▼有限公司 | A mold for composite products with a U-shaped structure with a deep cavity and thick walls |
| CN113459540A (en) * | 2021-06-25 | 2021-10-01 | 成都飞机工业（集团）有限责任公司 | Forming device and forming method for slender part with closed angle |
| CN113459540B (en) * | 2021-06-25 | 2022-05-10 | 成都飞机工业（集团）有限责任公司 | Forming device and forming method for slender part with closed angle |
| CN114083815A (en) * | 2021-09-26 | 2022-02-25 | 中车青岛四方机车车辆股份有限公司 | Cross beam forming die, cross beam forming process and cross beam |
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Inventor after: Liu Peng Inventor after: Yu Dalian Inventor after: Jiang Fujie Inventor after: Xiao Peng Inventor after: Zhu Jiaqiang Inventor after: Wang Bin Inventor after: Li Chenghua Inventor before: Zhu Jiaqiang Inventor before: Wang Bin Inventor before: Li Chenghua |
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Effective date of registration: 20210707 Address after: No.88, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province 266041 Applicant after: CRRC QINGDAO SIFANG Co.,Ltd. Address before: 201306 509 Hao Ge Road, mud town, Pudong New Area, Shanghai Applicant before: Shanghai Cedar Composites Technology Co.,Ltd. |