CN111674059A - Bag compression resin transfer molding mold, molding device and molding method - Google Patents
Bag compression resin transfer molding mold, molding device and molding method Download PDFInfo
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- CN111674059A CN111674059A CN202010095800.1A CN202010095800A CN111674059A CN 111674059 A CN111674059 A CN 111674059A CN 202010095800 A CN202010095800 A CN 202010095800A CN 111674059 A CN111674059 A CN 111674059A
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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
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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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
- B29C33/30—Mounting, exchanging or centering
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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
Abstract
The invention relates to a bag compression resin transfer molding die, a molding device and a molding method, wherein the die comprises an outer die, an upper die, a lower die, an air bag and a guide piece, wherein the upper die, the lower die, the air bag and the guide piece are positioned in the outer die; the device consists of a forming die, a gas storage tank, a vacuum pump, a pressure tank and a heating device; the method comprises the steps of firstly placing the reinforcing material in a mold, heating, vacuumizing a closed space between an upper mold and a lower mold, then filling resin, heating to a resin gel point, inflating an air bag to compress the lower mold, and finally curing and demolding. The forming die and the device have simple structures, and the method has high production efficiency.
Description
Technical Field
The invention belongs to the technical field of reinforced composite materials, and relates to a bag compression resin transfer molding forming die, a forming device and a forming method.
Background
In the fields of petrochemical industry, machine manufacturing, and the like, weight reduction of a complex structural member has been a focus of recent research. The reinforced composite material has the characteristics of high specific strength, high modulus, corrosion resistance, fatigue resistance, creep resistance, good design and large-area integral forming. Therefore, the replacement of metal materials by reinforced composite materials is an effective way to achieve light weight of parts, and the reinforced composite materials are receiving more and more attention.
Resin Transfer Molding (RTM) is a typical non-autoclave low-cost material fabrication technique, which has the major advantage of being able to fabricate complex contoured parts with high precision while maintaining high structural design efficiency. The RTM forming process is a process that liquid low-viscosity resin with reactivity flows in a mould, gas is exhausted, dry fibers are soaked and impregnated, and after soaking and impregnation are completed, the resin is heated in the mould to initiate a crosslinking reaction to complete solidification to obtain a formed product. The RTM process can be broken down into physical processes involving flow, infiltration, mold filling, and chemical reactions that convert liquid resins into solid materials. The prior art mostly adopts the process for producing reinforced composite material products, the mold adopted for producing reinforced composite materials in the prior art is shown in figure 1 and mainly comprises an upper mold 2, a lower mold 3, a sealing ring 19 and an injection molding pipe 20, the upper mold 2 and the lower mold 3 are of mutually matched groove structures, the opening surfaces of the grooves arranged on the upper mold 2 and the lower mold 3 are jointed to form a closed cavity, the volume of the closed cavity formed between the upper mold 2 and the lower mold 3 is fixed during injection, and the volume content of the reinforced composite material 10 can not be changed by applying external pressure in the later period, so the forming process adopting the mold sometimes needs to prepare a preformed body, the preformed body has small permeability, in addition, the RTM has large operation difficulty, long injection time and low efficiency, and gas brought in the injection process is difficult to be completely removed, so that the requirements of high performance, high efficiency and low cost of the composite materials can not be met, these are disadvantageous for the production and manufacture of more types of composite joints.
Therefore, the research on the bag compression resin transfer molding mold, the molding device and the molding method which have the advantages of simple structure, high production efficiency and low cost and can prepare the high-performance reinforced composite material is of great practical significance.
Disclosure of Invention
The invention aims to provide a bag compression resin transfer molding mold, a molding device and a molding method which have the advantages of simple structure, high production efficiency and low cost and can be used for preparing high-performance reinforced composite materials, aiming at the defects of the prior art.
The bag compression resin transfer molding forming die comprises an outer die, an upper die, a lower die, an air bag and a guide piece, wherein the upper die, the lower die, the air bag and the guide piece are positioned in the outer die;
the outer mold is a container which can be opened, closed and closed, and the upper mold and the lower mold are respectively a lug structure and a groove structure which are matched with each other;
the upper die is fixedly connected with the top of the outer die and is used for being embedded into the lower die when the die is closed, and a closed space is formed in the lower die; the lower die is positioned below the upper die; the air bag is positioned between the bottom of the lower die and the bottom of the outer die and is used for driving the lower die to move when being inflated; the guide piece is used for limiting the movement direction of the lower die to the vertical direction;
the upper die and the outer die are internally provided with communicated resin inlets, the resin inlets penetrate through the top of the outer die and the upper die, the bottom of the outer die is provided with an air inlet connected with an air bag inlet, the lower die is internally provided with a resin outlet penetrating through the lower die and communicated with the space in the groove and the space outside the groove, and the outer die is internally provided with a vacuum pump connecting port.
When the bag compression resin transfer molding mold is adopted for transfer molding, firstly, a vacuum pump connecting port on an outer mold is connected with a vacuum pump, the whole outer mold cavity is vacuumized through the vacuum pump, so that a negative pressure is kept for the system, then, pressure is applied, resin is poured through a resin inlet, the inside and the outside are combined, the pouring time is shortened, then, when the resin pouring is completed, air is blown into an air bag through an air inlet when the resin pouring is completed and the vicinity of a gel point is reached, the air bag pushes a lower mold to move upwards under the limiting action of a guide piece, so that the volume of a composite material is reduced, the gas in the system is removed, and the purpose of reducing the porosity is achieved, and therefore, the high-performance reinforced composite material with small porosity and excellent performance can be prepared.
As a preferred technical scheme:
the bag compression resin transfer molding forming die comprises an outer die, a cavity and a cavity, wherein the outer die is a cube b with a cavity in the cube a, the length of the cube a is 90-900mm, the width of the cube a is 90-900mm, the height of the cube b is 40-490mm, the length of the cube b is 100-1000 mm, the width of the cube b is 100-1000 mm, and the height of the cube b is 50-500 mm;
the upper die is a solid cube c, the length of the upper die is 50-800 mm, the width of the upper die is 50-800 mm, and the height of the upper die is 30-450 mm;
the lower die is a cube e with a cavity of a cube d arranged inside, the length of the cube d is 50-800 mm, the width of the cube d is 50-800 mm, the height of the cube d is 30-450 mm, the length of the cube e is 60-850 mm, the width of the cube e is 60-850 mm, and the height of the cube e is 35-480 mm;
the length of all cubes is the length of the longest edge, the height of all cubes is the length of the shortest edge, the longest edges of all cubes are parallel to each other, and the shortest edges of all cubes are parallel to each other;
the resin inlet is a cylindrical hole with the diameter of 13 mm; the two resin outlets are respectively positioned at the two sides of the lower die and are cylindrical holes with the diameter of 3 mm; the air inlet and the vacuum pump connecting port are cylindrical holes, and the diameter of each cylindrical hole is 3-10 mm. The sizes of the external mold, the upper mold and the lower mold of the invention include but are not limited to the above, and can be adjusted adaptively according to actual needs.
The bag compression resin transfer molding forming die is characterized in that the guide piece is a bolt, the number of the bolts is 2, the guide piece is fixedly connected with the bottom of the outer die, two cylindrical insertion holes are formed in the bottom of the lower die, the bolt is inserted into the insertion holes, the outer diameter of the bolt is smaller than the hole diameter of the insertion holes, the bolt plays a role in guiding and ensures that the lower die moves up and down, the specific arrangement form is not limited to the above, the bolt can be fixedly connected with the lower die, the outer diameter of the bolt is smaller than the hole diameter of the insertion holes formed in the outer die and used for inserting the bolt, the bottom of the lower die can be fixedly connected with one end of the spring, the other end of the spring is connected with the bottom of.
The bag compression resin transfer molding forming die as described above, further comprising an in-line viscosity sensor and a thickness sensor; the on-line viscosity sensor is formed by sequentially connecting a viscosity measuring head, a variable speed motor and a signal converter, wherein the viscosity measuring head is arranged in the lower die, and the variable speed motor and the signal converter are arranged outside the outer die; the structure of the on-line viscosity sensor is a reduced version of a common viscosity measuring instrument, and the principle of the on-line viscosity sensor is that a variable speed motor drives a viscosity measuring head to rotate through a connecting piece, the rotation of the viscosity measuring head is hindered by the viscosity of resin, the resistance is larger and larger along with the rise of the viscosity, and the change of the resistance is converted into the change of the viscosity through a signal converter, so that the viscosity change condition of a resin system can be monitored in real time; the thickness sensor is arranged in the lower die; the working surface of the thickness sensor is perpendicular to the lower surface of the lower die, the working surface is a surface which generates displacement deformation after being compressed, specifically, the viscosity measuring head is arranged at the right lower corner of the inner side of the lower die, the thickness sensor is arranged on the left wall of the inner side of the lower die, and a lead of the thickness sensor and a connecting piece between the viscosity measuring head and the variable speed motor penetrate through the lower die and are subjected to special sealing treatment, so that the thickness sensor can bear 25MPa pressure and is airtight.
The invention also provides a bag compression resin transfer molding forming device, which comprises the bag compression resin transfer molding forming die, a gas storage tank, a vacuum pump, a pressure tank and a heating device;
the air storage tank is respectively connected with an air inlet and a pressure tank of the bag compressed resin transfer molding forming die, and a valve, a pressure gauge and a pressure regulator are arranged on a connecting pipeline; the pipeline of the vacuum pump is connected with a vacuum pump connecting port of the bag compression resin transfer molding mould; the pressure tank is connected with a resin inlet of the bag compression resin transfer molding mould through a pipeline; the heating device is used for heating the bag compression resin transfer molding forming die.
As a preferred technical scheme:
in the above bag compressed resin transfer molding apparatus, the air inlet of the bag compressed resin transfer molding die and the pressure tank are connected to the same air tank; the heating device is an oven.
The invention also provides a bag compression resin transfer molding method adopting the bag compression resin transfer molding device, which comprises the steps of firstly laying the reinforcing material in the lower die, closing the bag compression resin transfer molding die, heating the bag compression resin transfer molding die in a heating device, vacuumizing the closed space between the upper die and the lower die, then filling resin into the closed space between the upper die and the lower die, heating the bag compression resin transfer molding die, monitoring the resin curing process through an online viscosity sensor, inflating the air bag to compress the lower die when the resin gel point is reached, enabling the composite material system to be more compact until the thickness sensor monitors that the resin thickness reaches a set value, and finally heating, curing, cooling and demolding.
As a preferred technical scheme:
the method for transfer molding the bag by compressing the resin comprises the following specific steps:
(1) opening a bag compression resin transfer molding forming die, smearing a release agent, laying a reinforcing material in a lower die, closing the bag compression resin transfer molding forming die, and heating the bag compression resin transfer molding forming die to 50-80 ℃ in a heating device; the purpose of heating the mould is to prevent the resin from increasing viscosity caused by cooling in the process of pouring and influencing resin permeation; the heating temperature includes, but is not limited to, that can be properly adjusted, but is not too high, and the curing of the resin may be accelerated by too high temperature, and the viscosity of the resin may not meet the requirement of infusion by too low temperature;
(2) opening a vacuum pump, and pumping out air in the closed space between the upper die and the lower die to enable the air pressure of the closed space between the upper die and the lower die to be-0.099-0.09 MPa;
(3) adjusting a pressure regulator, and injecting resin into a closed space between the upper die and the lower die from a pressure tank by using the pressure of 10-15 MPa until the pressure is full; the pressure used during resin injection includes, but is not limited to, that can be adjusted properly, but should not be too high, and the mold may be damaged due to too high pressure; when the pressure is too low, the resin cannot be quickly soaked into the reinforced material;
(4) heating a bag compression resin transfer molding forming die to 90-130 ℃, monitoring a resin curing process through an online viscosity sensor, adjusting a pressure regulator when a resin gel point is reached (namely, when the viscosity reaches 150000-250000 mps), firstly inflating an air bag with the pressure of 8-12 MPa to compress a lower die, keeping for 0.5-2 min, then inflating the air bag with the pressure of 12-20 MPa to compress the lower die until the thickness sensor monitors that the resin thickness reaches a set value; the pressure adopted in the process includes but is not limited to the above, can be properly adjusted, but is not too small, and the composite material has insufficient compactness due to too small pressure, so that the effect cannot be achieved; the pressure is too high, and the resin can be extruded out in a large amount to cause the glue shortage of a composite material system; the invention can realize different compression ratios by adjusting the air pressure of the air bag according to the requirements of actual engineering, and prepare composite material products with different porosities and fiber volume contents;
(5) heating a bag compression resin transfer molding forming die to 150-180 ℃, and preserving heat for 1-2 hours, so as to reduce the viscosity of the resin, improve the fluidity and prevent the resin from being cured too early;
(6) cooling to room temperature, and demolding.
According to the bag compression resin transfer molding forming method, the reinforcing material is fiber or a fiber product, the fiber is carbon fiber, glass fiber or basalt fiber, the carbon fiber product can be carbon fiber cloth, and the carbon fiber cloth is T300-grade or T700-grade carbon fiber cloth; the resin is a resin with the viscosity of 0.1-1 pa · s at room temperature; the porosity of the finally prepared reinforced composite material is 0.5-3.5%, the fiber volume content is 40-90%, the tensile strength is 800-1400 MPa, the bending strength is 700-1300 MPa, the interlaminar shear strength is 45-80 MPa, and other conditions are the same, the porosity of the reinforced composite material prepared by adopting the die in the prior art is about 4%, and the bending strength is about 600 MPa.
The above-mentioned bag compression resin transfer molding method, the resin is an epoxy resin, a phenol resin or an unsaturated polyester resin. The resin types of the present invention include, but are not limited to, those exemplified herein only by some of the currently common resins, and other moldable resins are suitable for use in the present invention.
Has the advantages that:
(1) the bag compression resin transfer molding forming die is simple in structure, and the problems that the used die in the prior art is high in complexity, small in permeability of a preformed body, large in operation difficulty, long in injection time and low in efficiency, and gas brought in the injection process is difficult to remove are effectively solved by improving the forming die;
(2) the forming device comprising the bag compression resin transfer molding forming die is high in production efficiency, the forming method of the reinforced composite material by the forming device is simple in process, accurate in process control and low in cost, the mechanical property of the reinforced composite material is greatly improved, and the reinforced composite material is widely applied to light weight.
Drawings
FIG. 1 is a schematic structural view of a resin transfer molding die in the prior art;
FIG. 2 is a schematic view of the construction of a bag compression resin transfer molding die of the present invention;
FIG. 3 is a schematic view showing the structure of a molding apparatus comprising a bag compression resin transfer molding mold according to the present invention;
the device comprises an outer die 1, an upper die 2, a lower die 3, an air bag 4, a guide part 5 (bolt), a resin inlet 6, an air inlet 7, a resin outlet 8, a vacuum pump connecting port 9, a reinforcing material 10, a compressed resin transfer molding die 11, a gas storage tank 12, a vacuum pump 13, a pressure tank 14, a drying oven 15, a valve 16, a pressure gauge 17, a pressure regulator 18, a sealing ring 19, an injection molding pipe 20, an online viscosity sensor 21, a thickness sensor 22, a connecting part 23, a variable speed motor 24 and a signal converter 25.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
The bag compression resin transfer molding forming die comprises an outer die 1, an upper die 2, a lower die 3, an air bag 4 and a guide 5 which are positioned in the outer die 1, and further comprises an online viscosity sensor 21 and a thickness sensor 22, as shown in FIG. 2;
the outer die 1 is a container capable of being opened, closed and provided with a cubic body b with a cavity body of a cubic body a, the length of the cubic body a is 90-900mm, the width of the cubic body a is 90-900mm, the height of the cubic body b is 40-490mm, the length of the cubic body b is 100-1000 mm, the width of the cubic body b is 100-1000 mm, and the height of the cubic body b is 50-500 mm;
the upper die and the lower die are respectively of a bump structure and a groove structure, the upper die is a solid cube c, the length of the upper die is 30-450 mm, the width of the upper die is 50-800 mm, and the height of the upper die is 50-500 mm; the lower die is a cube e with a cavity of a cube d arranged inside, the length of the cube d is 50-800 mm, the width of the cube d is 50-800 mm, the height of the cube d is 30-450 mm, the length of the cube e is 60-850 mm, the width of the cube e is 60-850 mm, and the height of the cube e is 35-480 mm;
the length of all cubes is the length of the longest edge, the height of all cubes is the length of the shortest edge, the longest edges of all cubes are parallel to each other, and the shortest edges of all cubes are parallel to each other;
the upper die 2 is fixedly connected with the top of the outer die 1 and is used for being embedded into the lower die 3 when the die is closed, and a closed space is formed in the lower die 3; the lower die 3 is positioned below the upper die 2; the air bag 4 is positioned between the bottom of the lower die 3 and the bottom of the outer die 1 and is used for driving the lower die 3 to move when being inflated; the guide piece 5 is a bolt, the number of the bolts is 2, the bolt is fixedly connected with the bottom of the outer die 1, two cylindrical installation holes are formed in the bottom of the lower die 3, the bolt is inserted into the installation holes, the outer diameter of the bolt is smaller than the hole diameter of the installation holes, and the guide piece 5 is used for limiting the movement direction of the lower die 3 in the vertical direction;
the upper die 2 and the outer die 1 are internally provided with communicated resin inlets 6, the resin inlets 6 are cylindrical holes, the diameter of the resin inlets is 13mm, the resin inlets 6 penetrate through the top of the outer die 1 and the upper die 2, the bottom of the outer die 1 is provided with air inlets 7 connected with air bag inlets, the lower die 3 is internally provided with resin outlets 8 which penetrate through the lower die 3 and are communicated with the space inside and outside the groove, the number of the resin outlets 8 is two, the resin outlets are respectively positioned at two sides of the lower die 3 and are cylindrical holes, the diameter of the resin outlets is 3mm, the outer die 1 is internally provided with a vacuum pump connecting port 9, the air inlets 7 and the vacuum pump connecting port 9 are;
the on-line viscosity sensor 21 is formed by sequentially connecting a viscosity measuring head, a variable speed motor 24 and a signal converter 25, wherein the viscosity measuring head is arranged in the lower die 3 and is connected with the variable speed motor 24 through a connecting piece 23, and the variable speed motor 24 and the signal converter 25 are arranged outside the outer die; the thickness sensor 22 is installed in the lower die 3; the working surface of the thickness sensor 22 is perpendicular to the lower surface of the lower die 3, and the working surface is a surface which generates displacement deformation after being compressed.
Example 2
A bag compression resin transfer molding die, substantially the same as example 1, except that it does not include the in-line viscosity sensor 21 and the thickness sensor 22.
Example 3
A bag-compressed resin transfer molding apparatus, as shown in fig. 3, comprising a bag-compressed resin transfer molding die 11, a gas tank 12, a vacuum pump 13, a pressure tank 14, and an oven 15 of example 1;
the same air storage tank 12 is respectively connected with an air inlet of the bag compressed resin transfer molding forming die 11 and a pressure tank 14, and a valve 16, a pressure gauge 17 and a pressure regulator 18 are arranged on the connecting pipelines; the pipeline of the vacuum pump 13 is connected with a vacuum pump connecting port of the bag compression resin transfer molding mould 11; the pressure tank 14 is connected to the resin inlet of the bag compression resin transfer molding die 11 through a pipe; the oven 15 is used to heat the bag compression resin transfer molding die 11.
Example 4
The method for carrying out the bag compression resin transfer molding by adopting the bag compression resin transfer molding device comprises the following specific steps:
(1) opening the bag compression resin transfer molding forming die, smearing a release agent, laying the T300-grade carbon fiber cloth in the lower die, closing the bag compression resin transfer molding forming die, and placing the bag compression resin transfer molding forming die in a drying oven to be heated to 50 ℃;
(2) opening a vacuum pump, and pumping the air pressure of a closed space between the upper die and the lower die to-0.099 MPa;
(3) adjusting a pressure regulator, and injecting epoxy resin with the viscosity of 0.5pa · s at room temperature into a closed space between the upper die and the lower die from a pressure tank by using the pressure of 10MPa until the pressure is full;
(4) heating a bag compression resin transfer molding forming die to 90 ℃, monitoring a resin curing process through an online viscosity sensor, adjusting a pressure regulator when a resin gel point is reached (about 30min), firstly inflating an air bag with the pressure of 10MPa to compress a lower die, keeping for 1min, and then inflating the air bag with the pressure of 15MPa to compress the lower die until the thickness of the resin monitored by a thickness sensor reaches 4 mm;
(5) heating a bag compression resin transfer molding forming die to 150 ℃, and preserving heat for 1 h;
(6) cooling to room temperature, and demolding.
The porosity of the finally prepared carbon fiber reinforced composite material is 2.5%, the fiber volume content is 60%, the tensile strength is 950MPa, the bending strength is 900MPa, and the interlaminar shear strength is 45 MPa.
Example 5
The method for carrying out the bag compression resin transfer molding by adopting the bag compression resin transfer molding device comprises the following specific steps:
(1) opening the bag compression resin transfer molding forming die, coating a release agent, laying glass fiber cloth in the lower die, closing the bag compression resin transfer molding forming die, and placing the bag compression resin transfer molding forming die in a drying oven to be heated to 70 ℃;
(2) opening a vacuum pump, and pumping the air pressure of a closed space between the upper die and the lower die to-0.085 MPa;
(3) adjusting a pressure regulator, injecting unsaturated polyester resin with the viscosity of 0.1 pa.s at room temperature into a closed space between the upper die and the lower die from a pressure tank by using the pressure of 15MPa until the pressure is full;
(4) heating a bag compression resin transfer molding forming die to 100 ℃, monitoring a resin curing process through an online viscosity sensor, adjusting a pressure regulator when a resin gel point is reached, firstly inflating an air bag with the pressure of 12MPa to compress the air bag to a lower die, keeping the pressure for 0.5min, and then inflating the air bag with the pressure of 20MPa to compress the air bag to the lower die until the thickness of the resin monitored by a thickness sensor reaches 3.5 mm;
(5) heating a bag compression resin transfer molding forming die to 180 ℃, and preserving heat for 1 h;
(6) cooling to room temperature, and demolding.
The porosity of the finally prepared glass fiber reinforced composite material is 0.5%, the fiber volume content is 40%, the tensile strength is 650MPa, the bending strength is 590MPa, and the interlaminar shear strength is 65 MPa.
Example 6
The method for carrying out the bag compression resin transfer molding by adopting the bag compression resin transfer molding device comprises the following specific steps:
(1) opening the bag compression resin transfer molding forming die, smearing a release agent, laying the T700-grade carbon fiber cloth in the lower die, closing the bag compression resin transfer molding forming die, and placing the bag compression resin transfer molding forming die in a drying oven to be heated to 80 ℃;
(2) opening a vacuum pump, and pumping the air pressure of a closed space between the upper die and the lower die to-0.085 MPa;
(3) adjusting a pressure regulator, injecting phenolic resin with the viscosity of 1 pa.s at room temperature into a closed space between the upper die and the lower die from a pressure tank by using the pressure of 10MPa until the pressure is full;
(4) heating a bag compression resin transfer molding forming die to 130 ℃, monitoring a resin curing process through an online viscosity sensor, adjusting a pressure regulator when a resin gel point is reached, firstly inflating an air bag with the pressure of 8MPa to compress the air bag to a lower die, keeping for 2min, then inflating the air bag with the pressure of 12MPa to compress the air bag to the lower die until the thickness of the resin monitored by a thickness sensor reaches 5.5 mm;
(5) heating a bag compression resin transfer molding forming die to 180 ℃, and preserving heat for 2 hours;
(6) cooling to room temperature, and demolding.
The porosity of the finally prepared carbon fiber reinforced composite material is 3.0%, the fiber volume content is 90%, the tensile strength is 1200MPa, the bending strength is 900MPa, and the interlaminar shear strength is 80 MPa.
Example 7
The method for carrying out the bag compression resin transfer molding by adopting the bag compression resin transfer molding device comprises the following specific steps:
(1) opening the bag compression resin transfer molding forming die, smearing a release agent, laying basalt fiber cloth in a lower die, closing the bag compression resin transfer molding forming die, and placing the bag compression resin transfer molding forming die in a drying oven to be heated to 60 ℃;
(2) opening a vacuum pump, and pumping the air pressure of a closed space between the upper die and the lower die to-0.09 MPa;
(3) adjusting a pressure regulator, and injecting epoxy resin with the viscosity of 0.7pa · s at room temperature into a closed space between the upper die and the lower die from a pressure tank by using the pressure of 12MPa until the pressure is full;
(4) heating a bag compression resin transfer molding forming die to 100 ℃, monitoring a resin curing process through an online viscosity sensor, adjusting a pressure regulator when a resin gel point is reached, firstly inflating an air bag with the pressure of 12MPa to compress the air bag to a lower die, keeping the pressure for 0.5min, and then inflating the air bag with the pressure of 20MPa to compress the air bag to the lower die until the thickness of the resin monitored by a thickness sensor reaches 6.0 mm;
(5) heating a bag compression resin transfer molding forming die to 180 ℃, and preserving heat for 1 h;
(6) cooling to room temperature, and demolding.
The finally prepared basalt fiber reinforced composite material has the porosity of 3.5 percent, the fiber volume content of 70 percent, the tensile strength of 830MPa, the bending strength of 790MPa and the interlaminar shear strength of 60 MPa.
Claims (10)
1. The bag compression resin transfer molding forming die is characterized in that: comprises an external die, an upper die, a lower die, an air bag and a guide piece which are positioned in the external die;
the outer mold is a container which can be opened, closed and closed, and the upper mold and the lower mold are respectively a lug structure and a groove structure which are matched with each other;
the upper die is fixedly connected with the top of the outer die and is used for being embedded into the lower die when the die is closed, and a closed space is formed in the lower die; the lower die is positioned below the upper die; the air bag is positioned between the bottom of the lower die and the bottom of the outer die and is used for driving the lower die to move when being inflated; the guide piece is used for limiting the movement direction of the lower die to the vertical direction;
the upper die and the outer die are internally provided with communicated resin inlets, the resin inlets penetrate through the top of the outer die and the upper die, the bottom of the outer die is provided with an air inlet connected with an air bag inlet, the lower die is internally provided with a resin outlet penetrating through the lower die and communicated with the space in the groove and the space outside the groove, and the outer die is internally provided with a vacuum pump connecting port.
2. The bag compression resin transfer molding die according to claim 1, wherein the outer die is a cube b with a cavity of a cube a therein, the cube a has a length of 90 to 900mm, a width of 90 to 900mm, a height of 40 to 490mm, the cube b has a length of 100 to 1000mm, a width of 100 to 1000mm, and a height of 50 to 500 mm;
the upper die is a solid cube c, the length of the upper die is 50-800 mm, the width of the upper die is 50-800 mm, and the height of the upper die is 30-450 mm;
the lower die is a cube e with a cavity of a cube d arranged inside, the length of the cube d is 50-800 mm, the width of the cube d is 50-800 mm, the height of the cube d is 30-450 mm, the length of the cube e is 60-850 mm, the width of the cube e is 60-850 mm, and the height of the cube e is 35-480 mm;
the length of all cubes is the length of the longest edge, the height of all cubes is the length of the shortest edge, the longest edges of all cubes are parallel to each other, and the shortest edges of all cubes are parallel to each other;
the resin inlet is a cylindrical hole with the diameter of 13 mm; the two resin outlets are respectively positioned at the two sides of the lower die and are cylindrical holes with the diameter of 3 mm; the air inlet and the vacuum pump connecting port are cylindrical holes, and the diameter of each cylindrical hole is 3-10 mm.
3. The bag compression resin transfer molding die according to claim 1, wherein the guide member is a bolt, the number of the bolt is 2, the bolt is fixedly connected with the bottom of the outer die, the bottom of the lower die is provided with two cylindrical insertion holes, the bolt is inserted into the insertion holes, and the outer diameter of the bolt is smaller than the hole diameter of the insertion holes.
4. The bag-compressing resin transfer molding forming mold according to any one of claims 1 to 3, further comprising an in-line viscosity sensor and a thickness sensor; the on-line viscosity sensor is formed by sequentially connecting a viscosity measuring head, a variable speed motor and a signal converter, wherein the viscosity measuring head is arranged in the lower die, and the variable speed motor and the signal converter are arranged outside the outer die; the thickness sensor is arranged in the lower die; the working surface of the thickness sensor is perpendicular to the lower surface of the lower die, and the working surface is a surface which generates displacement deformation after being compressed.
5. The bag compression resin transfer molding forming device is characterized in that: comprising the bag-compressing resin transfer molding die of claim 4, a gas tank, a vacuum pump, a pressure tank and a heating means;
the air storage tank is respectively connected with an air inlet and a pressure tank of the bag compressed resin transfer molding forming die, and a valve, a pressure gauge and a pressure regulator are arranged on a connecting pipeline; the pipeline of the vacuum pump is connected with a vacuum pump connecting port of the bag compression resin transfer molding mould; the pressure tank is connected with a resin inlet of the bag compression resin transfer molding mould through a pipeline; the heating device is used for heating the bag compression resin transfer molding forming die.
6. The bag-compressed resin transfer molding apparatus according to claim 5, wherein the air inlet port of the bag-compressed resin transfer molding die and the pressure tank are connected to the same air reservoir; the heating device is an oven.
7. The bag compression resin transfer molding method using the bag compression resin transfer molding apparatus according to claim 5 or 6, characterized in that: firstly, laying a reinforcing material in a lower die, closing a bag to compress a resin transfer molding die, placing the resin transfer molding die in a heating device for heating, vacuumizing a closed space between an upper die and the lower die, filling resin into the closed space between the upper die and the lower die, heating the bag to compress the resin transfer molding die, monitoring a resin curing process through an online viscosity sensor, inflating an air bag to compress the lower die until the thickness sensor monitors that the thickness of the resin reaches a set value, and finally heating, curing, cooling and demolding.
8. The bag compression resin transfer molding method according to claim 7, characterized by comprising the specific steps of:
(1) opening a bag compression resin transfer molding forming die, smearing a release agent, laying a reinforcing material in a lower die, closing the bag compression resin transfer molding forming die, and heating the bag compression resin transfer molding forming die to 50-80 ℃ in a heating device;
(2) opening a vacuum pump, and pumping the air pressure of a closed space between the upper die and the lower die to-0.099 to-0.09 MPa;
(3) adjusting a pressure regulator, and injecting resin into a closed space between the upper die and the lower die from a pressure tank by using the pressure of 10-15 MPa until the pressure is full;
(4) heating a bag compression resin transfer molding forming die to 90-130 ℃, monitoring a resin curing process through an online viscosity sensor, adjusting a pressure regulator when a resin gel point is reached, firstly inflating an air bag with the pressure of 8-12 MPa to compress a lower die of the air bag, keeping for 0.5-2 min, then inflating the air bag with the pressure of 12-20 MPa to compress the lower die of the air bag until the thickness of the resin monitored by a thickness sensor reaches a set value;
(5) heating a bag compression resin transfer molding forming die to 150-180 ℃, and preserving heat for 1-2 hours;
(6) cooling to room temperature, and demolding.
9. The bag compression resin transfer molding forming method according to claim 8, wherein the reinforcing material is a fiber or a fiber product, the fiber being a carbon fiber, a glass fiber or a basalt fiber; the resin is a resin with the viscosity of 0.1-1 pa · s at room temperature; the porosity of the finally prepared reinforced composite material is 0.5-3.5%, the fiber volume content is 40-90%, the tensile strength is 800-1400 MPa, the bending strength is 700-1300 MPa, and the interlaminar shear strength is 45-80 MPa.
10. The method of claim 9 wherein the resin is an epoxy resin, a phenolic resin or an unsaturated polyester resin.
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| CN201910150018.2A CN110027227A (en) | 2019-02-28 | 2019-02-28 | Bag press-resin Transfer molding mold, molding machine and forming method |
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| CN112621283A (en) * | 2020-12-09 | 2021-04-09 | 东华大学 | Active locating and clamping method and device for thin-walled part with ultra-large radius-thickness ratio |
| CN113246396A (en) * | 2021-06-22 | 2021-08-13 | 山东奥扬新能源科技股份有限公司 | Bottle plastic accessory forming machine |
| CN113910549A (en) * | 2021-10-11 | 2022-01-11 | 四川大学华西医院 | Thermoplastic forming die of implanted flexible magnetic control bladder pump |
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| CN110027227A (en) * | 2019-02-28 | 2019-07-19 | 东华大学 | Bag press-resin Transfer molding mold, molding machine and forming method |
| CN112873714A (en) * | 2021-01-14 | 2021-06-01 | 苏州鸿翼卫蓝新材科技有限公司 | High-pressure RTM (resin transfer molding) process die for CFRP (carbon fiber reinforced plastics) engine hood of automobile |
| CN113021944A (en) * | 2021-03-10 | 2021-06-25 | 广州雷迅创新科技股份有限公司 | Forming method and die for wing |
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| CN113910549A (en) * | 2021-10-11 | 2022-01-11 | 四川大学华西医院 | Thermoplastic forming die of implanted flexible magnetic control bladder pump |
| CN113910549B (en) * | 2021-10-11 | 2023-08-08 | 四川大学华西医院 | Thermoplastic forming die of implanted flexible magnetic control bladder pump |
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