CN217622307U - Combined material booster-type preimpregnation material compression molding mould - Google Patents
Combined material booster-type preimpregnation material compression molding mould Download PDFInfo
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- CN217622307U CN217622307U CN202221583565.3U CN202221583565U CN217622307U CN 217622307 U CN217622307 U CN 217622307U CN 202221583565 U CN202221583565 U CN 202221583565U CN 217622307 U CN217622307 U CN 217622307U
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Abstract
The utility model provides a combined material booster-type preimpregnation material compression molding mould, include: a lower die and an upper die; when the upper die is placed on the lower die and the die is closed in place, a closed die cavity is formed; the prepreg is laid on the first cavity layer by layer to form a prepreg lamination; the prepreg lamination is cured in the die cavity under the action of the mold clamping force and the mold temperature to form a composite material; the pressurizing hole is positioned in the lower die; the top of the mould is communicated with the mould cavity and is positioned in a process allowance area of the prepreg lamination; the pressurizing device is filled with pressure transmission liquid, and the bottom of the pressurizing device is communicated with the bottom of the pressurizing hole through a pressure transmission pipeline. This application is through resin pressure in the supercharging device control prepreg stromatolite, the hole defect in the effective control composite product shaping.
Description
Technical Field
The utility model belongs to combined material forming technology, concretely relates to combined material booster-type preimpregnation material compression molding mould.
Background
The compression molding process of the prepreg is widely applied in the industry as the traditional process technology. In the process of the compression molding of the prepreg, the prepreg is cut into corresponding shapes, multiple layers of the prepreg are laid on a mold according to the laying design requirement, an upper mold and a lower mold are closed by a press, and the prepreg is continuously compacted under the action of the closing mold; and simultaneously, under the action of temperature and time, curing the resin to complete the molding of the composite material. Because the prepreg is a fiber fabric or a unidirectional tape soaked by resin in advance, air is easy to be mixed in the paving and pasting process; for large-scale mass production, in order to improve efficiency and shorten the heating time of a mould, a process mode of hot mould cooling is generally adopted, therefore, a prepreg lamination is placed on the mould, after an upper mould and a lower mould are in contact with the prepreg lamination, the temperature of the mould can promote the resin of the prepreg on the upper surface and the lower surface to be firstly melted to reach a viscous state, the melted resin flows under the action of a closing force to fill the gap between the upper surface layer and the lower surface layer, a relatively compact resin film is formed, a channel for exhausting air mixed in the prepreg lamination is sealed to a certain extent, and a pore defect occurs in a composite material product after the forming.
In order to reduce the defect of pores, a vacuumizing function is usually added in the die, but the upper die and the lower die are only in a die closing state, and the vacuum can be pumped after the die cavity is in a closed state; meanwhile, the situation that the resin in the viscous state on the surface of the prepreg lamination flows to the vacuum source end under the action of vacuum to block a vacuum pipeline is avoided, so that the effective vacuumizing time is short. For composite material products with large size, large thickness and complex configuration, the effect of vacuumizing to discharge mixed air is not ideal, and the defect of pores is difficult to control effectively. For a resin system generating small molecules in the curing process, as the mould pressing process cannot be vacuumized in the whole process like the autoclave process, the OOA process and the VARI process, the scheme of adding the vacuumizing function in the mould cannot reduce the pore defects of the composite material products; in addition, small molecules generated in the curing process are gathered on the surface of the die, and the composite material after compression molding has uneven surface, low dimensional precision and poor apparent mass.
In the mould pressing process, due to the limitation of the form of the mould, the mould clamping force of the press cannot effectively and completely act on the prepreg lamination, a part of the mould clamping force is borne by the mould, and the prepreg lamination only bears a part of the mould clamping force. Therefore, even if the clamping force of the press is set, the uniformity of the prepreg stack size cannot be ensured during the process, and therefore the pressure applied to the prepreg stack cannot be controlled, and further the resin pressure inside the prepreg stack cannot be controlled, and void defects are difficult to control.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect or not enough among the prior art, the utility model aims at providing a combined material booster-type preimpregnation material compression molding mould.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
a composite material supercharged prepreg compression molding die comprises: the top of the lower die is provided with a first cavity; the bottom of the upper die is provided with a second cavity; when the upper die is placed on the lower die and the die is closed in place, the first die cavity and the second die cavity are butted to form a closed die cavity; the prepreg is laid on the first cavity layer by layer to form a prepreg lamination; the prepreg lamination is cured in the die cavity under the action of a mold clamping force and a mold temperature to form a composite material; the pressurizing hole is positioned in the lower die; the top of the mould cavity is communicated with the mould cavity and is positioned in a process allowance area of the prepreg lamination; and the pressurizing device is filled with pressure transmission liquid, and the bottom of the pressurizing device is communicated with the bottom of the pressurizing hole through a pressure transmission pipeline.
According to the technical scheme provided by the embodiment of the application, the distance between the top of the pressurizing hole and the product cutting line is 30mm; the distance between the top of the pressurizing hole and the edge of the prepreg lamination to be cut is 10-30 mm.
According to the technical scheme provided by the embodiment of the application, the diameter of one end, communicated with the die cavity, of the pressurizing hole is 0.5-2 mm.
According to the technical scheme provided by the embodiment of the application, the liquid level of the pressure transmission liquid in the pressurizing device is not higher than the horizontal position of the cavity end of the pressurizing hole, and the liquid level difference of the liquid level of the pressurizing device and the liquid level of the pressure transmission liquid is 0-5 mm.
According to the technical scheme provided by the embodiment of the application, the pressure transmission liquid is single-component resin compatible with a prepreg resin system, and the viscosity of the pressure transmission liquid (6) is less than 400mPa.s.
According to the technical scheme provided by the embodiment of the application, the number of the pressurizing holes is one or more, and the pressurizing holes are uniformly distributed in the process allowance area; the number of the supercharging devices is one or more.
According to the technical scheme provided by the embodiment of the application, the starting time of the supercharging device is 20-30 s before the gel of the prepreg resin system; the closing time of the pressurizing device is 20-30 s after the prepreg resin system is gelled.
According to the technical scheme provided by the embodiment of the application, for a resin system which does not generate micromolecules in the curing process, the pressure value set by the pressurizing device is 0.6-0.8 MPa; for a resin system generating micromolecules in the curing process, the pressure value set by the pressurizing device is 1.2 MPa-1.6 MPa.
According to the technical scheme provided by the embodiment of the application, the upper die and the lower die are uniformly distributed with heating oil ducts, and the heating oil ducts are connected with the die temperature controller.
According to the technical scheme provided by the embodiment of the application, the pressure transmission pipeline is connected with the pressure transmission pipeline through the sealing joint, and the bottom of the pressurizing device is connected with the pressure transmission pipeline through the sealing joint.
According to the technical scheme provided by the embodiment of the application, the pressure transmission pipeline is connected with the pressure transmission pipeline through the sealing joint, and the bottom of the supercharging device is connected with the pressure transmission pipeline through the sealing joint.
The utility model discloses following beneficial effect has:
because this application has set up pressure boost hole on the mould, pressure boost hole one end and die cavity intercommunication, the other end and supercharging device intercommunication. And the pressure transmission liquid is arranged in the pressure boosting device. Therefore, pressure is effectively transmitted to the interior of the prepreg lamination in the prepreg molding process through the pressurizing device, and compared with the condition that the mold closing force of a press in the prior art cannot effectively and completely act on the prepreg lamination, the pore defect is effectively controlled by increasing the resin pressure and completely acting on the resin in the prepreg lamination; meanwhile, the pressurizing device realizes quantitative control of resin pressure in the prepreg lamination, ensures the consistency of process parameters and further ensures the consistency of product quality. For a prepreg resin system which generates small molecules in the curing process, the method not only can effectively control the pore defects, but also can ensure the surface flatness, the dimensional precision and the apparent quality of products.
Adopt forming method, pass on the high-efficient prepreg resin system that transmits pressure with supercharging device's pressure of pressure liquid fast, resin pressure sharply risees, and then inside bubble of compression prepreg stromatolite resin and mix with the air, make the volume of bubble show and reduce or disappear. The composite material is molded along with the curing of the resin gel, so that the porosity of the composite material is effectively controlled; similarly, for a resin system which generates small molecules in the curing process, enough resin pressure can effectively compress and collapse the generated small molecules, so that the pore defects are effectively controlled, and meanwhile, the surface flatness, the dimensional precision and the apparent quality of a product are ensured.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural cross-sectional view of a forming mold according to the present application.
Description of the reference numerals:
1. a lower die; 2. an upper die; 3. laminating prepreg; 4. a pressurizing hole; 5. a pressure boosting device; 6. Pressure transmitting liquid; 7. a pressure transmitting device; 8. sealing the joint; 9. the heating oil duct.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "front", "rear", "side", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally laid out when the disclosed products are used, and are only for convenience of describing and simplifying the present disclosure, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present disclosure, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "butted" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
A composite material supercharged prepreg compression molding die comprises: a lower die 1, the top of which is provided with a first cavity; an upper die 2, the bottom of which is provided with a second cavity; when the upper die 2 is placed on the lower die 1 and the die closing is in place, the first die cavity and the second die cavity are in butt joint to form a closed die cavity; the prepreg is paved on the first cavity layer by layer to form a prepreg lamination layer 3; the prepreg laminated layer 3 is cured in the die cavity under the action of a mold clamping force and a mold temperature to form a composite material; the pressurizing hole 4 is positioned in the lower die 1; the top of the mould cavity is communicated with the mould cavity and is positioned in a process allowance area of the prepreg lamination 3; the pressurizing device 5 is internally filled with pressure transfer liquid 6, and the bottom of the pressurizing device is communicated with the bottom of the pressurizing hole 4 through a pressure transfer pipeline 7.
As shown in figure 1, the upper die 2 and the lower die 1 are matched in place, and the first cavity and the second cavity are butted to form a closed die cavity. It can be understood that the prepreg is cut into corresponding shapes, and multiple layers of prepreg are laid on the lower die 1 according to the laying design requirement. The size of the prepreg comprises process allowance, and after the paving and the pasting are finished, the edge of the whole prepreg laminated layer 3 is in contact with the edge of the die cavity. The prepreg layup 3 is slightly thicker than the depth of the mould cavity and is in a relatively fluffy initial state. The prepreg layup 3 covers the pressurizing aperture 4.
It will be appreciated that the tops of the pressurisation holes 4 communicate with the mould cavity and that the tops of the pressurisation holes 4 will slowly come into contact with the prepreg layup (3) during the moulding process.
The process allowance zone is a zone formed by the redundant prepreg lamination layers (3) and product cutting lines, wherein the redundant prepreg lamination layers (3) are required to be cut by the composite material product finally formed by the prepreg lamination layers (3).
The lower die 1 is provided with a pressurizing hole 4, and the pressurizing hole 4 is positioned in the process allowance area of the composite material product. It should be noted that the area of the prepreg laminate 3 is larger than that of the composite material product, and the product cutting line of the composite material product is located inside the edge of the prepreg laminate 3, so that the finally formed composite material is cut according to the product cutting line to form the final composite material product. Here, it is understood that if a composite product requires a hole-cut product, the inside of the hole is also the process margin. The product cut lines have at least an inner and an outer portion, so that the prepreg stack 3 to be cut is located outside the outer product cut line and inside the inner product cut line.
The process allowance area arranged in the pressurizing hole 4 is favorable for preventing the pressure transmission liquid 6 from entering the effective area of the product and influencing the product performance.
Because the supercharging device 5 is communicated with the supercharging hole 4 through the pressure transmission pipeline 7, pressure transmission liquid 6 is arranged inside the supercharging device 5, the pressure transmission pipeline 7 and the supercharging hole 4.
The pressurizing device 5 can pressurize by adopting a pneumatic, hydraulic or mechanical mode, and realizes effective control of pressure.
The pressurizing device 5 facilitates quantitative control of pressure, the pressure of the pressurizing device 5 is efficiently transmitted to the interior of the prepreg laminated layer 3 in the prepreg molding process through the pressure transmission liquid 6, and air is mixed with air by compressing air bubbles in the interior of the resin of the prepreg laminated layer 3 through control and improvement of resin pressure, so that the volume of the air bubbles is remarkably reduced or disappears, and further the defect of pores is effectively controlled.
Because this application has set up pressure boost hole 4 on the mould, 4 one end in pressure boost hole and die cavity intercommunication, the other end and supercharging device 5 intercommunication. The pressurizing device 5 is internally provided with pressure transmission liquid 6. Therefore, pressure is effectively transmitted to the interior of the prepreg laminated layer 3 in the prepreg molding process through the pressurizing device 5, compared with the condition that the mold closing force of a press in the prior art cannot effectively and completely act on the prepreg laminated layer 3, the pore defect is effectively controlled by increasing the resin pressure and completely acting on the resin in the prepreg laminated layer 3; meanwhile, the pressurizing device 5 realizes quantitative control of the resin pressure in the prepreg laminated layer 3, and ensures the consistency of process parameters and further the consistency of product quality. For a prepreg resin system generating small molecules in the curing process, the method not only can effectively control the defect of pores, but also can ensure the surface flatness, the dimensional precision and the apparent quality of products. Mode mould pressing technology operability of evacuation is difficult, does not take out clean inclusion air easily, and this application adopts liquid conduction pressure, passes the pressure more high-efficient.
In one embodiment of the present application, the distance between the top of the pressurizing hole 4 and the product cutting line is 30mm; the distance between the top of the pressurizing hole 4 and the edge of the prepreg lamination 3 to be cut is 10-30 mm.
Specifically, the process allowance is beyond the product cutting line. Through process verification, when the distance between the top of the pressurizing hole 4 and the product cutting line is more than 30mm, the pressure transfer liquid 6 can be ensured not to be immersed into the effective area of the product. Generally, 30mm is used, and if the distance is too small, the pressure-transmitting liquid 6 may be immersed into the product, and if the distance is too large, the process margin is large, and the cost of raw materials is increased.
The distance between the top of the pressurizing hole 4 and the edge of the prepreg laminated layer 3 to be cut is 10 mm-30 mm, generally 30mm is selected, and the distance is smaller than 30mm, but the distance cannot be smaller than 0, so that liquid pressure cannot be transmitted or the pressure transmission effect is poor, the pressure transmission liquid 6 is ensured to fill the edge part as far as possible, and the raw material cost is increased when the distance is larger than 30mm.
In summary, the product cut line should be more than 60mm from the edge of the prepreg stack 3. The diameter of the hole of the product to be perforated is at least 60mm.
In one embodiment of the present application, the diameter of the end of the pressurizing hole 4 in contact with the prepreg stack 3 is 0.5mm to 2mm.
Specifically, because this application adopts liquid to pass pressure, pass and press efficiently. Because the pressure value can be set and controlled by the pressurizing device 5, the pressure of the pressurizing hole 4 is fixed, and if the diameter of the cavity end of the pressurizing hole 4 is too large, too much pressure transfer liquid 6 entering the lamination can cause uncontrollable products; the smaller the diameter of the cavity end of the pressurizing hole 4 is, the smaller the flow under the same pressure can be ensured, and the total amount of the liquid of the pressure transfer liquid 6 entering the lamination layer is smaller, so that the product performance can be conveniently controlled.
The diameter of the other end of the pressurizing hole 4 is not required, so that extensive management such as installation of a sealing joint 8 and the like is facilitated, and if the diameter of the end is small, unnecessary trouble is caused for installation.
In one embodiment of the present invention, the liquid level of the hydraulic fluid 6 in the pressurizing device 5 is not higher than the horizontal position of the cavity end of the pressurizing hole 4, and the difference between the liquid levels is 0mm to 5mm.
Specifically, the position of the pressurizing device 5 and the dosage of the pressure transmission liquid 6 are controlled, so that the liquid level of the pressure transmission liquid 6 in the pressurizing device 5 is not higher than the horizontal position of the cavity end of the pressurizing hole 4. The liquid levels of the two are the best, but the process requirements are considered, the error between the two can be controlled to be 1 mm-5 mm to meet the requirements, and the control is convenient without excessively limiting the actual operation. Even if the surface is not completely flat, the liquid surface can not be subjected to extravasation due to the existence of surface tension; however, the liquid level difference cannot be too high and is controlled within 5mm, because if the liquid level difference is too high, the pressure transfer liquid 6 can be caused to infiltrate without external force.
In one embodiment of the present application, the pressure transfer fluid 6 is a one-component resin compatible with a prepreg resin system, and the viscosity of the pressure transfer fluid 6 is less than 400mpa.s.
Specifically, the pressure transmission fluid 6 is a one-component resin compatible with a prepreg resin system, that is, a resin containing no curing agent. For example, if the resin system of the prepreg is an epoxy resin system, the pressure-transmitting liquid 6 is also an epoxy resin, does not contain a curing agent, is liquid at normal temperature, and has a viscosity of less than 400mpa.s during use. The hydraulic fluid 6 may be epoxy resin, phenolic resin, vinyl ester resin, etc. according to different prepreg resin systems.
Generally, after a small amount of pressure transmission liquid 6 entering the interior of the prepreg lamination 3 is mixed with a prepreg resin system, the pressure transmission liquid 6 adopts a single-component resin compatible with the prepreg resin system, and a curing agent in the prepreg resin system can promote curing of the resin, so that mold cleaning and subsequent product processing are facilitated.
The viscosity of the pressure transfer liquid 6 is less than 400mPa.s. Because the aperture at the top end of the pressurizing hole is fixed, the viscosity of the pressure transmission liquid is too high, the fluidity of the pressure transmission liquid is influenced, and the pressure transmission effect is poor.
In one embodiment of the present application, the number of the pressurizing holes 4 is one or more, and the pressurizing holes are uniformly distributed in the process margin area; the number of the pressurization devices 5 is one or more.
Specifically, if the volume of the composite material product is too large, it is recommended to uniformly distribute a plurality of pressurizing holes 4 in the product process allowance area of the lower die 1, and a single or a plurality of pressurizing devices 5 can be adopted for control. The phenomenon that the curing degree of the composite material final product is influenced and the product quality is further influenced because the excessive pressure transmission liquid 6 flowing into the prepreg lamination layer 3 through the single pressurizing hole 4 exceeds the cutting line of the composite material final product is avoided.
In one embodiment of the present application, the opening time of the pressurizing device 5 is 20s to 30s before the gel of the prepreg resin system; the closing time of the pressurizing device 5 is 20-30 s after the prepreg resin system is gelled.
Specifically, the opening time of the pressurizing device 5 is controlled to be 20-30 s before the gel of the prepreg resin system. At this time, the resin in the prepreg laminate 3 is already in a flowable liquid state, the liquid pressure transmission reaches a preset pressure instantly, air bubbles and air inclusion are controlled and the expansion of the air bubbles and the air inclusion is limited, and meanwhile, the liquid amount of the pressure transmission liquid 6 entering the interior of the laminate is very small, so that the product performance is ensured.
The pressurization device 5 is opened too early, so that excessive pressure transfer liquid 6 is easily caused to enter the prepreg laminated layer 3 and exceed the cutting line of the final product of the composite material, and the curing degree of the final product of the composite material is influenced; after the supercharging device 5 is opened too late, the prepreg resin system in the supercharging hole 4 cannot effectively flow back to enter the prepreg laminated layer 3, and the supercharging hole 4 is blocked after the resin system is cured. If the pressurizing device 5 is started after the prepreg resin system is gelled, the resin is cured, liquid pressure cannot be transmitted, the expected pressurizing effect cannot be achieved, and finally the pore defect cannot be controlled.
Specifically, the closing time of the pressurizing device 5 is controlled to be 20-30 s after the prepreg resin system is gelled. At this point, the resin is already cured and molded, and the continuous pressurization is not effective, and the cost is increased.
In one embodiment of the present application, the pressure increasing device 5 is set to a pressure value of 0.6MPa to 0.8MPa for a resin system that does not generate small molecules during curing; for a resin system generating micromolecules in the curing process, the pressure value set by the pressurizing device 5 is 1.2 MPa-1.6 MPa.
Specifically, the pressure values set for different resin systems are values that are process-verified, and within the range, the molding effect is the best.
The pressurizing device 5 is controlled by hydraulic pressure, air pressure or mechanical mode, and realizes quantitative control of resin pressure inside the prepreg lamination 3 in the prepreg compression molding process according to the liquid pressure transmission principle, thereby ensuring the consistency of process parameters.
In a certain embodiment of the present application, the upper die 2 and the lower die 1 have heating oil ducts 9 uniformly distributed therein, and the heating oil ducts 9 are connected with a die temperature controller.
Specifically, the mold temperature is controlled by a mold temperature controller, so that the uniformity of the mold temperature and the temperature is ensured, and the process requirements of composite material molding are met.
In one embodiment of the present application, the pressure transmission pipeline 7 is connected to the pressure transmission pipeline 7 through a sealing joint 8, and the bottom of the pressure boosting device 5 is connected to the pressure transmission pipeline 7 through the sealing joint 8.
Specifically, the sealing joint 8 ensures the tightness in the pressure transmission process, effectively transmits the pressure, and further effectively controls the defect of the pore.
Example two
A compression molding method of a supercharged prepreg of a composite material is completed by adopting the molding die, and comprises the following steps:
installing a die, and controlling the use amount of the pressurizing device 5 and the pressure transmitting liquid 6 to ensure that the liquid level of the pressure transmitting liquid 6 of the pressurizing device 5 is not higher than the horizontal position of the die cavity end of the pressurizing hole 4, and the liquid level difference between the two is controlled between 0mm and 5 mm;
cutting a prepreg, wherein the size of the cut prepreg comprises a process allowance area;
laying and pasting the cut multilayer prepreg on a lower die 1, wherein a process allowance area of a prepreg lamination layer 3 covers a pressurizing hole 4;
the upper die 2 and the lower die 1 are matched, and the prepreg lamination 3 is compacted under the action of the matched die force; melting resin under the action of the temperature of the mold to reach a viscous state, infiltrating the fibers in the prepreg by the resin to further fill the gaps among the layers and in the layers of the prepreg lamination 3 and between the lamination and the mold cavity, and injecting the resin into the pressurizing holes 4 until the upper mold 2 and the lower mold 1 are matched in place;
setting a pressurization value of the pressurization device 5, and starting the pressurization device 5 20-30 s before the prepreg resin system is gelled;
closing the supercharging device 5 after the prepreg resin system is gelled for 20-30 s;
the prepreg laminate 3 is cured inside the cavity under the action of mold clamping force and mold temperature to form a composite material.
Specifically, in actual operation, the die assembly is performed according to the above-mentioned die scheme, and the die assembly is installed on a press device, and the upper die 2 and the lower die 1 are connected with a die temperature controller through the heating oil duct 9; the pressurizing device 5, the pressure transmission pipeline 7 and the pressurizing hole 4 are filled with pressure transmission liquid 6, wherein the position of the pressurizing device 5 and the dosage of the pressure transmission liquid 6 are controlled, so that the liquid level of the pressure transmission liquid 6 in the pressurizing device 5 is not higher than the horizontal position of the cavity end of the pressurizing hole 4, and the liquid level difference between the two is controlled between 0mm and 5mm.
Cutting the prepreg into corresponding shapes, and paving and adhering the multiple layers of prepreg on the lower die 1 according to the paving design requirement. The size of the prepreg contains process allowance, after the paving and the pasting are finished, the edge of the whole prepreg laminated layer 3 is in contact with the edge of the cavity of the mold, the thickness of the prepreg laminated layer 3 is slightly larger than the depth of the cavity of the mold, and the prepreg laminated layer is in a relatively fluffy initial state. The prepreg layup 3 covers the pressurizing holes 4.
In the process of closing the upper die 2 and the lower die 1, the prepreg lamination 3 which is initially relatively fluffy is gradually compacted under the action of the closing force. The resin of the prepreg lamination 3 is gradually melted under the action of the temperature of the mold to reach a viscous state, the melted resin flows under the action of mold closing force, fibers in the prepreg are further infiltrated, gaps among layers, in layers and between the lamination and a mold cavity of the prepreg lamination 3 are further filled, and meanwhile, a part of resin enters the pressurizing hole 4 until the upper mold 2 and the lower mold 1 of the mold are in mold closing position to form a closed mold cavity.
Before the prepreg resin system is gelled, a pressurization value is set, at the moment that the pressurization device 5 is started, the pressure of the pressure transfer liquid 6 in the pressurization device 5 is larger than the resin pressure in the prepreg lamination 3, and the pressure transfer liquid 6 in the pressurization hole 4 pushes the resin which initially enters the pressurization hole 4 to flow back to the inside of the prepreg lamination 3. According to the principle of liquid transmission pressure intensity, the pressure of the pressurizing device 5 is efficiently and quickly transmitted to the prepreg resin system by the pressure transmission liquid 6, the resin pressure is rapidly increased, and then air bubbles and air inclusion in the resin of the prepreg laminated layer 3 are compressed, so that the volume of the air bubbles is remarkably reduced or disappears. The composite material is molded along with the curing of the resin gel, so that the porosity of the composite material is effectively controlled; similarly, for a resin system which generates small molecules in the curing process, enough resin pressure can effectively compress and collapse the generated small molecules, so that the pore defects are effectively controlled, and meanwhile, the surface flatness, the dimensional precision and the apparent quality of a product are ensured.
The above description is only a preferred embodiment of the invention and is intended to illustrate the technical principles applied. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features and (but not limited to) technical features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (10)
1. The utility model provides a combined material booster-type preimpregnation material compression molding mould which characterized in that includes:
the top of the lower die (1) is provided with a first cavity;
an upper die (2) with a second cavity at the bottom; when the upper die (2) is placed on the lower die (1) and the die is closed in place, the first die cavity and the second die cavity are butted to form a closed die cavity;
the prepreg is paved on the first cavity layer by layer to form a prepreg lamination layer (3); the prepreg lamination (3) is cured in the die cavity under the action of a mold clamping force and a mold temperature to form a composite material;
the pressurizing hole (4) is positioned inside the lower die (1); the top of the prepreg lamination layer is communicated with the die cavity and is positioned in a process allowance area of the prepreg lamination layer (3);
the pressurizing device (5) is internally filled with pressure transfer liquid (6), and the bottom of the pressurizing device is communicated with the bottom of the pressurizing hole (4) through a pressure transfer pipeline (7).
2. The supercharged prepreg compression molding die for composite materials according to claim 1, wherein the distance between the tops of the supercharging holes (4) and the product cutting line is 30mm; the distance between the top of the pressurizing hole (4) and the edge of the prepreg lamination (3) to be cut is 10-30 mm.
3. The supercharged prepreg compression molding die for composite materials according to claim 1, wherein the diameter of the end of the pressurizing hole (4) communicated with the die cavity is 0.5mm to 2mm.
4. The pressurizing type composite material prepreg compression molding mold according to claim 1, wherein the liquid level of the pressure transmission liquid (6) in the pressurizing device (5) is not higher than the horizontal position of the mold cavity end of the pressurizing hole (4), and the difference between the liquid levels is 0 mm-5 mm.
5. The pressurized compression molding die for the prepreg made of the composite material according to claim 1, wherein the pressure transfer fluid (6) is a one-component resin compatible with a prepreg resin system, and the viscosity of the pressure transfer fluid (6) is less than 400mPa.s.
6. The supercharged prepreg compression molding die for composite materials according to claim 1, wherein the number of the supercharging holes (4) is one or more and is uniformly distributed in the process allowance zone; the number of the supercharging devices (5) is one or more.
7. The supercharged prepreg compression molding die for composite materials according to claim 1, wherein the starting time of the supercharging device (5) is 20-30 s before the gelation of the prepreg resin system; the closing time of the pressurizing device (5) is 20-30 s after the prepreg resin system is gelled.
8. The supercharged prepreg compression molding die for composite materials according to claim 1, wherein the supercharging device (5) sets a pressure value of 0.6 to 0.8MPa for a resin system which does not generate small molecules during curing; for a resin system generating micromolecules in the curing process, the pressure value set by the pressurizing device (5) is 1.2 MPa-1.6 MPa.
9. The supercharged prepreg compression molding die for composite materials according to claim 1, wherein heating oil ducts (9) are uniformly distributed in the upper die (2) and the lower die (1), and the heating oil ducts (9) are connected with a die temperature controller.
10. The pressurizing mould for composite material and supercharged prepreg compression molding according to claim 1, wherein the pressure transmission pipeline (7) is connected with the pressure transmission pipeline (7) through a sealing joint (8), and the bottom of the pressurizing device (5) is connected with the pressure transmission pipeline (7) through the sealing joint (8).
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| CN202221583565.3U CN217622307U (en) | 2022-06-23 | 2022-06-23 | Combined material booster-type preimpregnation material compression molding mould |
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| CN202221583565.3U CN217622307U (en) | 2022-06-23 | 2022-06-23 | Combined material booster-type preimpregnation material compression molding mould |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115071164A (en) * | 2022-06-23 | 2022-09-20 | 廊坊市飞泽复合材料科技有限公司 | A composite material pressurized prepreg molding die and molding method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115071164A (en) * | 2022-06-23 | 2022-09-20 | 廊坊市飞泽复合材料科技有限公司 | A composite material pressurized prepreg molding die and molding method |
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