CN112848388B - Manufacturing process of fiber reinforced composite material signboard - Google Patents
Manufacturing process of fiber reinforced composite material signboard Download PDFInfo
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- CN112848388B CN112848388B CN202011497540.7A CN202011497540A CN112848388B CN 112848388 B CN112848388 B CN 112848388B CN 202011497540 A CN202011497540 A CN 202011497540A CN 112848388 B CN112848388 B CN 112848388B
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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
- B29C70/36—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 impregnating by casting, e.g. vacuum casting
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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
- 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
- B29C70/545—Perforating, cutting or machining during or after moulding
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- Composite Materials (AREA)
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a manufacturing process of a fiber reinforced composite material signboard, belongs to the technical field of road signboards, and mainly solves the technical problems of heavy weight, low mechanical property and the like of the existing road signboards. The technical scheme of the invention comprises the following steps: preparing an epoxy resin-curing agent solution; preparing a prefabricated body of a bottom plate of the signboard; demolding and repairing the bottom plate of the signboard; preparing a prefabricated body of a horizontal upright post of the signboard; demolding and repairing the horizontal upright post of the signboard; preparing a prefabricated body of the signboard fastener: demolding and repairing the signboard fastener; preparing a prefabricated body of a longitudinal upright post of the signboard; demolding and repairing the vertical upright post of the signboard; preparing a prefabricated body of the base of the signboard; demolding and repairing the base of the signboard; assembling; and (3) simulating and calculating the mechanical characteristics and the influence on wind resistance of the fiber reinforced composite material signboard by using ABAQUS software. The invention has the advantages of reasonable structural design, excellent performance, high working efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of road signboards, and particularly relates to a manufacturing process of a fiber reinforced composite material signboard.
Background
Road sign tablet is the sign that shows traffic laws and regulations and road information and be used for guaranteeing the unblocked and driving safety of road, and current road sign tablet is mostly aluminium alloy material, has the problem that the quality is heavy and mechanical properties is low.
The fiber reinforced composite material is a composite material which is mature in research and quite wide in application at present. Compared with common aluminum alloy materials, the aluminum alloy material has the advantages of light weight, high strength, large modulus, strong corrosion resistance, wide raw material sources, strong performance plasticity and the like, and becomes an important prop material in national economy. The preparation method of the compound is as follows: hand lay-up molding, winding molding, RTM molding, pultrusion molding, and the like. Has wide application prospect in the aspect of being applied to the pavement marker.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a manufacturing process of a fiber reinforced composite material signboard, and solves the technical problems of heavy weight, low mechanical property and the like of the existing road signboard.
In order to solve the problems, the technical scheme of the invention is as follows: a fiber reinforced composite material signboard manufacturing process comprises the following steps:
1) Preparing an epoxy resin-curing agent solution: sequentially adding epoxy resin and an imidazole curing agent into a plastic container, mechanically stirring, and uniformly mixing to obtain an epoxy resin-curing agent solution;
2) Preparing a prefabricated body of the bottom plate of the signboard: uniformly coating a layer of release agent on the inner wall of a mold, cutting 15 pieces of 2500mm multiplied by 4100mm glass fiber cloth, laying the 15 pieces of cut glass fiber cloth, stacking the glass fiber cloth into an inner cavity of the mold, sealing the glass fiber cloth, communicating an opening at one end of the mold with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the inner cavity of the mold, uniformly spreading the epoxy resin-curing agent solution on the glass fiber cloth in the inner cavity of the mold, closing the vacuum pump, and finally performing curing treatment;
3) Demolding and repairing the bottom plate of the signboard: taking out the prefabricated body of the signboard base plate in the inner cavity of the first die, and then cutting, polishing and finishing to obtain the signboard base plate with the size of 2400mm multiplied by 4000 mm;
4) Preparing a prefabricated body of the horizontal upright post of the signboard: uniformly coating a layer of release agent on the inner wall of the second mold and the outer wall of a mold core rod horizontally arranged in the middle of the inner cavity of the second mold, winding a glass fiber cloth on the mold core rod to prepare a glass fiber cloth pipe with the inner diameter of 70mm, the outer diameter of 160mm and the length of 4600mm, then sealing the second mold, communicating an opening at one end of the second mold with the inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the second mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the inner cavity of the second mold and uniformly spread on the glass fiber cloth pipe in the inner cavity of the second mold, then closing the vacuum pump, and finally performing curing treatment;
5) Demolding and repairing the horizontal upright post of the signboard: taking out the prefabricated body of the horizontal upright post of the signboard in the inner cavity of the second die, and then cutting, polishing and finishing to prepare the horizontal upright post of the signboard with the inner diameter of 70mm, the outer diameter of 152mm and the length of 4500 mm;
6) Preparing a prefabricated body of the signboard fastener: placing a mold core rod with the diameter of 75mm in the X direction at the front position of the middle part of the three inner cavities of the mold, placing a mold core rod with the diameter of 220mm in the Z direction at the rear position of the middle part of the three inner cavities of the mold, placing a mold core rod with the diameter of 75mm in the Y direction at the rear position of the middle part of the three inner cavities of the mold, and contacting the front end of the mold core rod placed in the Y direction with the side wall of the mold core rod placed in the Z direction; uniformly coating a layer of release agent on the three inner walls of the mold and the outer walls of the three groups of mold core rods, cutting 15 pieces of 250 mm-250 mm glass fiber cloth, cutting a round hole with the aperture of 220mm at the position of the mold core rod in the Z direction, laying the 15 pieces of cut glass fiber cloth flatly and then stacking the glass fiber cloth into an inner cavity of the mold, arranging the mold core rods in the Z direction in the round holes of the glass fiber cloth, and respectively placing the mold core rods in the X direction and the Y direction between the laid glass fiber cloth laminates; communicating an opening at one end of the mould with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the mould with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the three inner cavities of the mould and uniformly spread on glass fiber cloth in the three inner cavities of the mould, then closing the vacuum pump, and finally performing curing treatment;
7) Demolding and repairing the signboard fastener: taking out the prefabricated parts of the signboard fasteners in the three inner cavities of the die, and then cutting, polishing and finishing to prepare the signboard fasteners with the size of 200mm multiplied by 200mm, 75 mm-diameter connecting holes arranged in the X direction, 75 mm-diameter connecting holes arranged in the Y direction and 220 mm-diameter connecting holes arranged in the Z direction;
8) Preparing a prefabricated vertical column body of the signboard: uniformly coating a layer of release agent on the four inner walls of the mold and the outer wall of a mold core rod horizontally arranged in the middle of the four inner cavities of the mold, winding glass fiber cloth on the mold core rod to prepare a glass fiber cloth pipe with the inner diameter of 100mm, the outer diameter of 230mm and the length of 7700mm, then sealing the mold, wherein an opening at one end of the mold is communicated with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, openings at the other ends of the mold are communicated with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, so that the epoxy resin-curing agent solution enters the four inner cavities of the mold and is uniformly dispersed on the glass fiber cloth pipe in the four inner cavities of the mold, then closing the vacuum pump, and finally performing curing treatment;
9) Demolding and repairing the vertical upright post of the signboard: taking out the prefabricated body of the vertical upright post of the signboard in the four inner cavities of the die, and then cutting, polishing and finishing to prepare the vertical upright post of the signboard with the inner diameter of 100mm, the outer diameter of 219mm and the length of 7600 mm;
10 Preparation of the signboard base preform: uniformly coating a layer of release agent on the inner wall of a five-cavity mold, cutting 15 pieces of 900mm × 900mm glass fiber cloth, flatly paving 15 pieces of cut glass fiber cloth, then stacking the glass fiber cloth into the five inner cavities of the mold and sealing the glass fiber cloth, wherein an opening at one end of the five-cavity mold is communicated with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, an opening at the other end of the five-cavity mold is communicated with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, so that the epoxy resin-curing agent solution enters the five inner cavities of the five-cavity mold and is uniformly dispersed on the glass fiber cloth in the first inner cavity of the mold, then closing the vacuum pump, and finally carrying out curing treatment;
11 Demolding and repair of the sign base: taking out the prefabricated body of the signboard base in the five inner cavities of the die, and then cutting, polishing and finishing to obtain the signboard base with the size of 800mm multiplied by 800 mm;
12 Assembling: assembling the prepared signboard base plate, the signboard transverse upright post, the signboard fastening piece, the signboard longitudinal upright post and the signboard base together to obtain the fiber reinforced composite material signboard; the signboard base is arranged on the bottom surface of the signboard longitudinal upright post, the signboard transverse upright post is horizontally arranged on one side of the top of the signboard longitudinal upright post, one end of the signboard transverse upright post is connected with the top of the signboard longitudinal upright post through a signboard fastener, and the other end of the signboard transverse upright post is connected with the signboard base plate; one end of the horizontal signboard upright post, which is close to the signboard fastener, is connected with a connecting hole of the signboard fastener in the X direction through a positioning pin, the top end of the vertical signboard upright post penetrates through the connecting hole of the signboard fastener in the Z direction, and a fastener height positioning pin is arranged in the connecting hole of the signboard fastener in the Y direction;
13 ABAQUS software is used for simulating and calculating the mechanical property and the influence on wind resistance of the fiber reinforced composite material signboard.
Further, the first mold has the following dimensions: a rectangular cavity with the length of 2500mm, the width of 4100mm and the height of 110 mm; the second mould has the following dimensions: a cylindrical cavity with the inner diameter of 260mm and the length of 4600 mm; the third die has the following dimensions: a rectangular cavity with the length of 300mm, the width of 300mm and the height of 300 mm; the fourth mould is characterized in that the fourth mould has the following dimensions: a cylindrical cavity with the inner diameter of 320mm and the length of 7700 mm; the fifth die has the following dimensions: a rectangular cavity with the length of 900mm, the width of 900mm and the height of 300 mm.
Further, the glass fiber cloth in the steps 2), 6) and 10) is paved and then is overlapped by adopting a method of alternately paving in the warp and weft directions.
Further, in the step 1), the epoxy resin and the imidazole curing agent are mixed according to the ratio of 2:1, uniformly mixing;
further, the curing treatment in the steps 2), 4), 6) and 8) is to put the mold and the preform in the mold into an oven, adjust the temperature to 60 ℃ and maintain the temperature for 2h, and then adjust the temperature to 80 ℃ and maintain the temperature for 2h.
Further, the assembly mode of the step 12) adopts welding assembly; in the step 13), the ABAQUS software simulation adopts a surface-to-surface contact mode.
Further, in the step 13), the wind speed applied to the fiber reinforced composite material signboard in the ABAQUS software simulation process is 15m/s.
Furthermore, a plurality of small openings are formed in the signboard bottom plate of the fiber reinforced composite material signboard, and the diameter of each small opening is 20 +/-4 mm
By adopting the technical scheme, the imidazole curing agent has higher curing activity, and can be cured in a short time under the condition of medium temperature, so that the working benefit is greatly improved. The epoxy resin has thermosetting polymer material with excellent adhesion, corrosion resistance, electric insulation and other performance, and the prepared composite material has high impact resistance, high heat adaptability and long service life of 20-30 years. Compared with the aluminum alloy signboard, the glass fiber reinforced epoxy resin composite signboard obtained by the vacuum pumping method is effectively reduced by about 35%. Under the condition of the same wind resistance, the impact resistance is enhanced by 14 percent. And under the condition of small openings, the wind resistance is effectively reduced by 16%.
Compared with the prior art, the invention has the advantages of reasonable structural design, excellent performance, high working efficiency and the like.
Drawings
FIG. 1 is a product drawing of a signboard base plate;
FIG. 2 is a schematic structural view of a fiber reinforced composite sign;
FIG. 3 is the Mises stress of the aluminum alloy signboard under the action of ABAQUS simulation 300Pa in the invention;
FIG. 4 is the Mises stress of the glass fiber reinforced epoxy resin composite signboard of the present invention under the action of ABAQUS simulation 300 Pa;
FIG. 5 is the Mises stress of the glass fiber reinforced epoxy resin composite small open-cell signboard simulated by using ABAQUS in the invention;
Detailed Description
The invention is described in further detail below with reference to the figures and examples.
The manufacturing process of the fiber reinforced composite material signboard shown in fig. 1 to 5 comprises the following steps:
1) Preparing an epoxy resin-curing agent solution: sequentially adding epoxy resin and an imidazole curing agent into a plastic container, mechanically stirring, and uniformly mixing to obtain an epoxy resin-curing agent solution;
2) Preparing a prefabricated body of the signboard base plate 1: uniformly coating a layer of release agent on the inner wall of a mold, cutting 15 pieces of 2500mm multiplied by 4100mm glass fiber cloth, laying the 15 pieces of cut glass fiber cloth, stacking the glass fiber cloth into an inner cavity of the mold, sealing the glass fiber cloth, communicating an opening at one end of the mold with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the inner cavity of the mold, uniformly spreading the epoxy resin-curing agent solution on the glass fiber cloth in the inner cavity of the mold, closing the vacuum pump, and finally performing curing treatment;
3) Demolding and repairing the signboard base plate 1: taking out the prefabricated body of the signboard base plate 1 in an inner cavity of the mold I, and then cutting, polishing and finishing to prepare the signboard base plate 1 with the size of 2400mm multiplied by 4000 mm;
4) Preparing a prefabricated body of the horizontal upright post 2 of the signboard: uniformly coating a layer of release agent on the inner wall of the second mold and the outer wall of a mold core rod horizontally arranged in the middle of the inner cavity of the second mold, winding a glass fiber cloth on the mold core rod to prepare a glass fiber cloth pipe with the inner diameter of 70mm, the outer diameter of 160mm and the length of 4600mm, then sealing the second mold, communicating an opening at one end of the second mold with the inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the second mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the inner cavity of the second mold and uniformly spread on the glass fiber cloth pipe in the inner cavity of the second mold, then closing the vacuum pump, and finally performing curing treatment;
5) Demolding and repairing the horizontal upright post 2 of the signboard: taking out the prefabricated signboard transverse upright post 2 in the inner cavity of the second die, and then cutting, polishing and finishing to obtain a signboard transverse upright post 2 with the inner diameter of 70mm, the outer diameter of 152mm and the length of 4500 mm;
6) Preparing a prefabricated body of the signboard fastening piece 3: placing a mold core rod with the diameter of 75mm in the X direction at the front position of the middle part of the three inner cavities of the mold, placing a mold core rod with the diameter of 220mm in the Z direction at the rear position of the middle part of the three inner cavities of the mold, placing a mold core rod with the diameter of 75mm in the Y direction at the rear position of the middle part of the three inner cavities of the mold, and contacting the front end of the mold core rod placed in the Y direction with the side wall of the mold core rod placed in the Z direction; uniformly coating a layer of release agent on the three inner walls of the mold and the outer walls of the three groups of mold core rods, cutting 15 pieces of 250 mm-250 mm glass fiber cloth, cutting a round hole with the aperture of 220mm at the position of the mold core rod in the Z direction, laying the 15 pieces of cut glass fiber cloth flatly and then stacking the glass fiber cloth into an inner cavity of the mold, arranging the mold core rods in the Z direction in the round holes of the glass fiber cloth, and respectively placing the mold core rods in the X direction and the Y direction between the laid glass fiber cloth laminates; communicating an opening at one end of the mould with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the mould with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the three inner cavities of the mould and uniformly spread on glass fiber cloth in the three inner cavities of the mould, then closing the vacuum pump, and finally carrying out curing treatment;
7) Demolding and repairing of the signboard fastener 3: taking out the prefabricated part of the signboard fastener 3 in the three inner cavities of the mold, and then cutting, polishing and finishing to prepare the signboard fastener 3 with the size of 200mm multiplied by 200mm, 75mm connecting holes in the X direction, 75mm connecting holes in the Y direction and 220mm connecting holes in the Z direction;
8) Preparing a prefabricated body of the vertical upright post 4 of the signboard: uniformly coating a layer of release agent on the four inner walls of the mold and the outer wall of a mold core rod horizontally arranged in the middle of the four inner cavities of the mold, winding glass fiber cloth on the mold core rod to prepare a glass fiber cloth pipe with the inner diameter of 100mm, the outer diameter of 230mm and the length of 7700mm, then sealing the mold, wherein an opening at one end of the mold is communicated with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, openings at the other ends of the mold are communicated with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, so that the epoxy resin-curing agent solution enters the four inner cavities of the mold and is uniformly dispersed on the glass fiber cloth pipe in the four inner cavities of the mold, then closing the vacuum pump, and finally performing curing treatment;
9) Demolding and repairing the vertical upright post 4 of the signboard: taking out the prefabricated body of the vertical post 4 of the signboard in the four inner cavities of the die, and then cutting, polishing and finishing to prepare the vertical post 4 of the signboard with the inner diameter of 100mm, the outer diameter of 219mm and the length of 7600 mm;
10 Preparation of the signboard base 5 preform: uniformly coating a layer of release agent on the inner wall of a five-cavity mold, cutting 15 pieces of 900mm multiplied by 900mm glass fiber cloth, laying the 15 pieces of cut glass fiber cloth flatly, stacking the glass fiber cloth into a five-cavity mold, sealing the glass fiber cloth, communicating an opening at one end of the five-cavity mold with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the five-cavity mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the five-cavity mold and uniformly spread on the glass fiber cloth in the one-cavity mold, closing the vacuum pump, and finally performing curing treatment;
11 Demolding and repair of the signboard base 5: taking out the prefabricated body of the signboard base 5 in the five inner cavities of the die, and then cutting, polishing and finishing to prepare the signboard base 5 with the size of 800mm multiplied by 800 mm;
12 Assembling: assembling the prepared signboard base plate 1, the signboard transverse upright post 2, the signboard fastening piece 3, the signboard longitudinal upright post 4 and the signboard base 5 together to obtain the fiber reinforced composite material signboard; the signboard base 5 is arranged on the bottom surface of the signboard longitudinal upright post 4, the signboard transverse upright post 2 is horizontally arranged on one side of the top of the signboard longitudinal upright post 4, one end of the signboard transverse upright post 2 is connected with the top of the signboard longitudinal upright post 4 through a signboard fastener 3, and the other end of the signboard transverse upright post 2 is connected with the signboard bottom plate 1; one end of the horizontal signboard upright post 2, which is close to the signboard fastening piece 3, is connected with a connecting hole in the direction of 3X of the signboard fastening piece through a positioning pin, the top end of the vertical signboard upright post 4 penetrates through the connecting hole in the direction of 3Z of the signboard fastening piece, and a fastening piece height positioning pin is arranged in the connecting hole in the direction of 3Y of the signboard fastening piece;
13 ABAQUS software is used for simulating and calculating the mechanical characteristics and the influence on wind resistance of the fiber reinforced composite material signboard.
Further, the first mold has the following dimensions: a rectangular cavity with the length of 2500mm, the width of 4100mm and the height of 110 mm; the second die has the following dimensions: a cylindrical cavity with the inner diameter of 260mm and the length of 4600 mm; the third die has the following dimensions: a rectangular cavity with the length of 300mm, the width of 300mm and the height of 300 mm; the fourth mould is characterized in that the fourth mould has the following dimensions: a cylindrical cavity with the inner diameter of 320mm and the length of 7700 mm; the fifth die has the following dimensions: a rectangular cavity with the length of 900mm, the width of 900mm and the height of 300 mm.
Further, the glass fiber cloth in the steps 2), 6) and 10) is paved and then is overlapped by adopting a method of alternately paving in the warp and weft directions.
Further, in the step 1), the epoxy resin and the imidazole curing agent are mixed according to the ratio of 2:1, uniformly mixing;
further, in the curing treatment in the steps 2), 4), 6) and 8), the mold and the preform in the mold are placed into an oven, the temperature is adjusted to 60 ℃ and kept for 2 hours, and then the temperature is adjusted to 80 ℃ and kept for 2 hours.
Further, the assembly mode of the step 12) adopts welding assembly; in the step 13), the ABAQUS software simulation adopts a surface-to-surface contact mode.
Further, in the step 13), the wind speed applied to the fiber reinforced composite material signboard in the ABAQUS software simulation process is 15m/s.
Furthermore, a plurality of small openings are arranged on the signboard bottom plate 1 of the fiber reinforced composite material signboard, and the diameter of each small opening is 20 +/-4 mm
The fiber reinforced composite material signboard prepared by the invention is compared with the aluminum alloy signboard with the same size and degree in mechanical property under the same wind resistance, so that the fiber reinforced composite material signboard is reduced by 35% in mass and enhanced by 14% in wind resistance compared with the aluminum alloy signboard;
the fiber reinforced composite material signboard with the hole on the signboard base plate manufactured by the method is compared with the fiber reinforced composite material signboard without the hole on the signboard base plate with the same size and degree manufactured by the method in mechanical properties under the same wind resistance, and the wind resistance of the fiber reinforced composite material signboard with the hole is enhanced by 16%;
the fiber reinforced composite material signboard with the holes on the bottom plate of the signboard prepared by the invention is compared with the mechanical properties of aluminum alloy signboards with the same size and without the holes under the same wind resistance, and the wind resistance capability of the fiber reinforced composite material signboard with the holes is enhanced by 21 percent.
Claims (8)
1. A fiber reinforced composite material signboard manufacturing process is characterized in that: the method comprises the following steps:
1) Preparing an epoxy resin-curing agent solution: sequentially adding epoxy resin and an imidazole curing agent into a plastic container, mechanically stirring, and uniformly mixing to obtain an epoxy resin-curing agent solution;
2) Preparing a prefabricated body of the signboard base plate (1): uniformly coating a layer of release agent on the inner wall of a mold, cutting 15 pieces of 2500mm multiplied by 4100mm glass fiber cloth, laying the 15 pieces of cut glass fiber cloth, stacking the glass fiber cloth into an inner cavity of the mold, sealing the glass fiber cloth, communicating an opening at one end of the mold with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the inner cavity of the mold, uniformly spreading the epoxy resin-curing agent solution on the glass fiber cloth in the inner cavity of the mold, closing the vacuum pump, and finally performing curing treatment;
3) Demolding and repairing the signboard base plate (1): taking out the prefabricated body of the signboard base plate (1) in an inner cavity of the mold I, and then cutting, polishing and finishing to obtain the signboard base plate (1) with the size of 2400mm multiplied by 4000 mm;
4) Preparing a prefabricated body of the horizontal upright post (2) of the signboard: uniformly coating a layer of release agent on the inner wall of the second mold and the outer wall of a mold core rod horizontally arranged in the middle of the inner cavity of the second mold, winding a glass fiber cloth on the mold core rod to prepare a glass fiber cloth pipe with the inner diameter of 70mm, the outer diameter of 160mm and the length of 4600mm, then sealing the second mold, communicating an opening at one end of the second mold with the inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the second mold with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the inner cavity of the second mold and uniformly spread on the glass fiber cloth pipe in the inner cavity of the second mold, then closing the vacuum pump, and finally performing curing treatment;
5) Demolding and repairing the horizontal upright post (2) of the signboard: taking out the prefabricated body of the horizontal upright post (2) of the signboard in the inner cavity of the second die, and then cutting, polishing and finishing to prepare the horizontal upright post (2) of the signboard with the inner diameter of 70mm, the outer diameter of 152mm and the length of 4500 mm;
6) Preparing a prefabricated body of the signboard fastener (3): placing a mold core rod with the diameter of 75mm in the X direction at the middle part of the three inner cavities of the mold close to the front position, placing a mold core rod with the diameter of 220mm in the Z direction at the middle part of the three inner cavities of the mold close to the rear position, placing a mold core rod with the diameter of 75mm in the Y direction at the middle part of the three inner cavities of the mold close to the rear position, and contacting the front end of the mold core rod placed in the Y direction with the side wall of the mold core rod placed in the Z direction; uniformly coating a layer of release agent on the three inner walls of the mold and the outer walls of the three groups of mold core rods, cutting 15 pieces of 250 mm-250 mm glass fiber cloth, cutting a round hole with the aperture of 220mm at the position of the mold core rod in the Z direction, laying the 15 pieces of cut glass fiber cloth flatly and then stacking the glass fiber cloth into an inner cavity of the mold, arranging the mold core rods in the Z direction in the round holes of the glass fiber cloth, and respectively placing the mold core rods in the X direction and the Y direction between the laid glass fiber cloth laminates; communicating an opening at one end of the mould with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, communicating an opening at the other end of the mould with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, enabling the epoxy resin-curing agent solution to enter the three inner cavities of the mould and uniformly spread on glass fiber cloth in the three inner cavities of the mould, then closing the vacuum pump, and finally performing curing treatment;
7) Demolding and repairing the signboard fastener (3): taking out prefabricated parts of the signboard fastening pieces (3) in the three inner cavities of the die, and then cutting, polishing and finishing to obtain the signboard fastening pieces (3) with the size of 200mm multiplied by 200mm, 75 mm-diameter connecting holes arranged in the X direction, 220 mm-diameter connecting holes arranged in the Z direction and 75 mm-diameter connecting holes arranged in the Y direction;
8) Preparing a prefabricated body of the vertical upright post (4) of the signboard: uniformly coating a layer of release agent on the four inner walls of the mold and the outer wall of a mold core rod horizontally arranged in the middle of the four inner cavities of the mold, winding glass fiber cloth on the mold core rod to prepare a glass fiber cloth pipe with the inner diameter of 100mm, the outer diameter of 230mm and the length of 7700mm, then sealing the mold, wherein an opening at one end of the mold is communicated with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, openings at the other ends of the mold are communicated with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, so that the epoxy resin-curing agent solution enters the four inner cavities of the mold and is uniformly dispersed on the glass fiber cloth pipe in the four inner cavities of the mold, then closing the vacuum pump, and finally performing curing treatment;
9) Demolding and repairing the vertical upright post (4) of the signboard: taking out the prefabricated body of the vertical post (4) of the signboard in the four inner cavities of the die, and then cutting, polishing and finishing to prepare the vertical post (4) of the signboard with the inner diameter of 100mm, the outer diameter of 219mm and the length of 7600 mm;
10 Preparation of the preform of the signboard base (5): uniformly coating a layer of release agent on the inner wall of a five-cavity mold, cutting 15 pieces of 900mm × 900mm glass fiber cloth, flatly paving 15 pieces of cut glass fiber cloth, then stacking the glass fiber cloth into the five inner cavities of the mold and sealing the glass fiber cloth, wherein an opening at one end of the five-cavity mold is communicated with an inner cavity of a plastic container containing epoxy resin-curing agent solution through a connecting pipe, an opening at the other end of the five-cavity mold is communicated with a vacuum pump through a connecting pipe, starting the vacuum pump to vacuumize for more than 48 hours, so that the epoxy resin-curing agent solution enters the five inner cavities of the five-cavity mold and is uniformly dispersed on the glass fiber cloth in the first inner cavity of the mold, then closing the vacuum pump, and finally carrying out curing treatment;
11 Demolding and repair of the signboard base (5): taking out the prefabricated body of the signboard base (5) in the five inner cavities of the die, and then cutting, polishing and finishing to obtain the signboard base (5) with the size of 800mm multiplied by 800 mm;
12 Assembling: assembling the prepared signboard base plate (1), the signboard transverse upright post (2), the signboard fastener (3), the signboard longitudinal upright post (4) and the signboard base (5) together to obtain the fiber reinforced composite material signboard; the signboard base (5) is arranged on the bottom surface of the signboard longitudinal upright post (4), the signboard transverse upright post (2) is horizontally arranged on one side of the top of the signboard longitudinal upright post (4), one end of the signboard transverse upright post (2) is connected with the top of the signboard longitudinal upright post (4) through a signboard fastening piece (3), and the other end of the signboard transverse upright post (2) is connected with the signboard base plate (1); one end, close to the signboard fastening piece (3), of the horizontal signboard upright post (2) is connected with a connecting hole in the X direction of the signboard fastening piece (3) through a positioning pin, the top end of the vertical signboard upright post (4) penetrates through the connecting hole in the Z direction of the signboard fastening piece (3), and a fastening piece height positioning pin is arranged in the connecting hole in the Y direction of the signboard fastening piece (3);
13 ABAQUS software is used for simulating and calculating the mechanical property and the influence on wind resistance of the fiber reinforced composite material signboard.
2. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: the first size of the mould is as follows: a rectangular cavity with the length of 2500mm, the width of 4100mm and the height of 110 mm; the second die has the following dimensions: a cylindrical cavity with an inner diameter of 260mm and a length of 4600 mm; the third mould has the following dimensions: a rectangular cavity with the length of 300mm, the width of 300mm and the height of 300 mm; the fourth die has the following dimensions: a cylindrical cavity with the inner diameter of 320mm and the length of 7700 mm; the fifth die has the following dimensions: a rectangular cavity with the length of 900mm, the width of 900mm and the height of 300 mm.
3. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: and step 2), step 6) and step 10) adopt a method of alternately laying in warp and weft directions when the glass fiber cloth is laid flat and then stacked.
4. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: in the step 1), the epoxy resin and the imidazole curing agent are mixed according to the proportion of 2:1, and uniformly mixing.
5. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: the curing treatment in the steps 2), 4), 6) and 8) is to put the mold and the preform in the mold into an oven, firstly adjust the temperature to 60 ℃ and keep the temperature for 2h, and then adjust the temperature to 80 ℃ and keep the temperature for 2h.
6. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: the assembly mode of the step 12) adopts welding assembly; in the step 13), the ABAQUS software simulation adopts a surface-to-surface contact mode.
7. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: and step 13) applying wind speed of 15m/s to the fiber reinforced composite material sign board in the ABAQUS software simulation process.
8. The process for manufacturing a fiber reinforced composite signboard of claim 1, wherein the process comprises the steps of: a plurality of small openings are formed in a signboard bottom plate (1) of the fiber reinforced composite material signboard, and the diameter of each small opening is 20 +/-4 mm.
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| CN112848388A (en) | 2021-05-28 |
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