A composite material pressurized prepreg molding device

Abstract

The present invention provides a composite material supercharged prepreg molding device, and relates to the composite material molding technical field. The composite material supercharged prepreg molding device comprises a hydraulic pressurizing device, a negative pressure pump, and an upper mold base and a lower mold base that are arranged opposite to each other up and down. In the present invention, after the first stage of mold closing, a closed area is formed between the male module, the inner insert and the female mold cavity by a first seal, and the air in the closed area is sucked away by a negative pressure pump, so that all the air carried in the prepreg can be sucked away. When the second stage of mold closing is completed, hydraulic oil is injected into the piston plate above the pressurizing cavity by a hydraulic pressurizing device to increase the pressure in the pressurizing cavity, so that the prepreg molding process can be pressurized again. A new locking device is added, which can continuously lock the upper mold plate and the lower mold plate during the pressurization process to avoid pressurization failure, and effectively improve the safety of use.

Description

Technical Field

[0001] The invention relates to the technical field of composite material molding, in particular to a composite material supercharged prepreg molding device. Background Art

[0002] As a traditional process technology, prepreg compression molding is widely used in the industry. During the prepreg compression molding process, the prepreg is cut into corresponding shapes, and multiple layers of prepreg are laid on the mold according to the requirements of the layer design. The press forces the upper and lower molds to close. Under the action of the clamping force, the prepreg is continuously compacted; at the same time, under the action of temperature and time, the resin is cured to complete the molding of the composite material. Since the prepreg is a fiber fabric or unidirectional tape pre-impregnated with resin, it is easy to be mixed with air during the laying process; for large-scale mass production, in order to improve efficiency and shorten the mold heating time, the hot mold cold material process mode is usually adopted. Therefore, the prepreg stack is placed on the mold. After the upper and lower molds are in contact with the prepreg stack, the mold temperature will cause the resin of the upper and lower surfaces of the prepreg to melt first and reach a viscous flow state. The molten resin flows under the action of the clamping force and fills the gap between the upper and lower surface layers to form a relatively dense resin film, which to a certain extent closes the channel for the discharge of air mixed inside the prepreg stack, resulting in pore defects inside the composite product after molding.

[0003] In order to reduce porosity defects, a vacuuming function is usually added to the mold. However, in traditional molds, vacuuming can only be performed when the upper and lower molds are in the mold-closing state and the mold cavity is closed. At the same time, it is necessary to prevent the resin in the viscous flow state on the surface of the prepreg laminate from flowing to the vacuum source under the action of vacuum and blocking the vacuum pipeline. Therefore, the effective time of vacuuming is very short. For composite materials with large size, large thickness and complex configuration, the effect of vacuuming to remove the entrained air is not ideal, and it is difficult to effectively control porosity defects.

[0004] In addition, in the molding process, due to the limitations of the mold form, the clamping force of the press cannot be fully and effectively applied to the prepreg stack. Part of the clamping force will be borne by the mold, and the prepreg stack will only bear part of the clamping force. Therefore, the pressure borne by the prepreg stack cannot be controlled, and the resin pressure inside the prepreg stack cannot be controlled, and the consistency of the size of the prepreg stack cannot be ensured.

[0005] To this end, there is a publicly available technology that proposes a composite material pressurized prepreg compression molding mold and molding method (Chinese Patent Publication No. CN115071164A), the mold includes: a lower mold and an upper mold; when the upper mold is placed on the lower mold and the mold is closed in place, a closed mold cavity is formed; prepreg is laid layer by layer on the first cavity to form a prepreg stack; the prepreg stack is cured inside the mold cavity under the action of the clamping force and the mold temperature to form a composite material; a pressurization hole is located inside the lower mold; its top is connected to the mold cavity and is located in the process margin area of ​​the prepreg stack; a pressurization device, which contains a pressure transmission liquid, and its bottom is connected to the bottom of the pressurization hole through a pressure transmission pipeline; the molding method is completed using a molding mold. The disclosed technology actually controls the resin pressure in the prepreg stack through a pressurizing device, and then controls the pore defects in the molding of the composite product. In its actual application, the resin component used for pressurization squeezes the resin component in the prepreg out from the pressurizing hole. Since no curing agent is added to the resin component used for pressurization, the quality of the finished product is difficult to guarantee. It is difficult to control the boundary line of the two resin components to be exactly within the shear margin range proposed by it, and the pressurizing effect is to compress the air in the prepreg, that is, to reduce the volume of the bubbles. In fact, the bubbles still exist, and the improvement of product quality is very limited.

[0006] In summary, in order to solve the bubble and porosity defects in prepreg compression molding products, it is necessary to develop a composite material pressurized prepreg compression molding device. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a composite material pressurized prepreg compression molding device, which solves the problem that the air bubble pore defects in the composite material pressurized prepreg compression molding device in the prior art cannot be improved.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a composite material supercharged prepreg molding device, including a hydraulic pressure device, a negative pressure pump, and an upper mold base and a lower mold base arranged opposite to each other in the upper and lower directions, the upper wall of the lower mold base is fixedly connected to the lower mold plate, the upper wall of the lower mold plate is provided with a convex module, the lower wall of the upper mold base is fixedly connected to the upper pad and the upper mold plate in sequence from top to bottom, a clamping device for increasing the clamping force after mold closing is provided between the upper and lower mold plates, the inner wall of the upper mold plate is provided with a concave mold cavity that passes through from top to bottom, the convex module is adapted to the inner side wall of the concave mold cavity, the inner side wall of the concave mold cavity is slidably connected with an inner insert, and an upper molding surface and a lower molding surface are respectively provided between the inner insert and the opposite side of the convex module. , two groups of grooves are provided on the lower wall of the inner insert, and a pressure chamber that penetrates the upper wall of the upper insert is provided inside the upper pad. The pressure chamber is pressurized by a hydraulic pressure device, and a group of negative pressure chambers are respectively provided inside the upper pad and on the left and right sides of the pressure chamber. The two groups of negative pressure chambers are respectively opposite to a group of grooves up and down, and negative pressure is formed inside the negative pressure chamber by a negative pressure pump. Two groups of suction pipes are connected between the grooves and the negative pressure chamber. A piston plate is slidably connected inside the pressure chamber, and a plurality of groups of push rods are fixedly connected to the lower wall of the piston plate in a rectangular array. The ends of the plurality of push rods away from the piston plate all penetrate the inner wall of the upper pad and extend into the cavity of the concave mold, and the ends of the plurality of push rods extending into the cavity of the concave mold are fixedly connected to the upper wall of the inner insert.

[0009] Preferably, the front wall of the upper pad is distributed on the left and right and is fixedly connected with two groups of negative pressure interfaces in sequence, the two groups of negative pressure interfaces are respectively connected with the inside and outside of a group of negative pressure chambers, and the two groups of negative pressure interfaces are connected to the negative pressure pump through pipes, the front wall of the upper pad and located between the two groups of negative pressure interfaces are distributed on the left and right and are fixedly connected with an oil inlet interface, an oil return interface and a pressure gauge in sequence, the oil inlet interface, the oil return interface and the pressure gauge are connected with the inside of the pressurized chamber at one end facing the upper pad, the oil inlet interface and the oil return interface are connected with the hydraulic pressurizing device through pipes, the suction pipe is fixedly connected to the inner wall of the upper pad in an up and down through-hole shape, and the upper end of the suction pipe is connected with the inside of the negative pressure chamber, the lower end of the suction pipe is connected with the inner wall of the inner insert and is slidably connected thereto, the lower end of the suction pipe is connected with the inside of the trough, the inner wall of the trough is slidably connected with a valve plate, and a valve driving structure for driving the valve plate to move is provided inside the negative pressure chamber.

[0010] Preferably, the mold locking device comprises a mold locking seat, two groups of pin holders and two groups of mold locking pins, the mold locking seat is fixedly connected to the side wall of the upper mold plate, the lower end of the mold locking seat extends toward the lower side of the upper mold plate, the two groups of pin holders are fixedly connected to the side wall of the lower mold plate and are respectively located on both sides of the mold locking seat in a top view, a cavity penetrating the lower wall is provided inside the mold locking seat, the two groups of mold locking pins are respectively slidably connected to the inner front wall and the inner rear wall of the cavity and are axially opposite, and the opposite ends of the two groups of mold locking pins penetrate the mold locking seat. The inner wall of the seat, one end of the hanging pin seat away from the locking mold seat is fixedly connected with a back plate, the inner wall of the hanging pin seat is provided with a hanging pin hole, the inner cavity size of the hanging pin hole is consistent with the outer wall size of the locking pin, the hanging pin hole and the locking pin are axially opposite when the lower template and the upper template are in the mold closing state, a locking drive structure for driving the locking pin to insert into the hanging pin hole to achieve the locking state is provided between the locking pin and the locking mold seat, and an unlocking drive structure for pushing the locking pin out of the hanging pin hole is provided on the side of the back plate away from the hanging pin seat.

[0011] Preferably, the valve driving structure includes an electric telescopic rod and a connecting rod, the connecting rod is fixedly connected to the upper wall of the valve plate, the end of the connecting rod away from the valve plate passes through the inner wall of the inner insert and is slidably connected thereto, the electric telescopic rod is fixedly connected to the inner lower wall of the negative pressure chamber, the extending shaft of the electric telescopic rod passes through the inner wall of the upper pad, the inner wall of the inner insert and is slidably connected to the end of the connecting rod away from the valve plate.

[0012] Preferably, the end of the extended shaft of the electric telescopic rod is fixedly connected to a pull rod, the end of the pull rod away from the electric telescopic rod passes through the upper wall of the connecting rod and extends into the interior of the connecting rod, the end of the pull rod extending into the interior of the connecting rod is fixedly connected to an anti-slip block, and a second spring is provided on the outer wall of the pull rod and between the inner upper wall of the connecting rod and the anti-slip block.

[0013] Preferably, the locking drive structure includes a first cylinder, a connecting block, two groups of wedge blocks and two groups of rotating shafts, the first cylinder is fixedly connected to the upper wall of the locking base, the end of the extended shaft of the first cylinder passes through the inner wall of the locking base and extends into the cavity, the connecting block is fixedly connected to the end of the first cylinder extending into the cavity, the two groups of wedge blocks are fixedly connected to the end of the connecting block away from the first cylinder, the ends of the two groups of locking pins located inside the cavity are slidably connected between the opposite sides of the two groups of wedge blocks, the wedge blocks are in the shape of a cone with a larger top and a smaller bottom, and the two groups of rotating shafts are respectively fixedly connected to the inner walls of a group of locking pins and are both located at the end of the locking pin extending into the cavity.

[0014] Preferably, both ends of the rotating shaft penetrate the inner wall of the locking pin and extend toward both sides of the locking pin respectively, and the ends of the two groups of rotating shafts extending to the outside of the locking pin are rotatably connected to rollers, and the circumferential outer walls of the two groups of rollers are respectively rollingly connected to the outer walls of a group of wedge blocks.

[0015] Preferably, the unlocking drive structure includes a second cylinder and a push head. The second cylinder is fixedly connected to a side of the back plate away from the pin seat. The second cylinder extending shaft passes through the inner wall of the back plate and extends into the pin hole. The push head is fixedly connected to one end of the second cylinder extending shaft extending into the pin hole.

[0016] Preferably, step grooves are provided on the left and right sides of the concave mold cavity and close to the upper wall of the upper mold plate, and multiple groups of spring holes are provided on the inner lower walls of the two groups of step grooves. Flange edges are provided on the left and right sides of the inner insert, and the two groups of flange edges are respectively slidably connected to the inner side walls of a group of step grooves. A first spring is provided between the inner lower wall of the spring hole and the lower wall of the flange edge, and the inner insert is kept in contact with the lower wall of the upper pad by the elastic force of the first spring.

[0017] Preferably, the outer wall of the inner insert and the inner side wall of the die cavity, as well as the outer wall of the male module and the die cavity are sealed by multiple groups of first seals, the outer wall of the piston plate and the inner side wall of the pressurized chamber are sealed by a second seal, the outer wall of the push rod and the upper pad are sealed by a third seal, and the groove and the valve plate, as well as the suction pipe and the inner insert are respectively sealed by a group of fourth seals.

[0018] The present invention provides a composite material pressurized prepreg molding device, which has the following beneficial effects:

[0019] Compared with the prior art, in the composite material pressurized prepreg molding device, the prepreg is laid on the male module, and the male module enters the female mold cavity but does not contact the inner insert to form the first mold closing stage. At this time, a closed area is formed between the male module, the inner insert and the female mold cavity through the first seal, and the air in the closed area is sucked away by a negative pressure pump, so that all the air carried in the prepreg can be sucked away, which can effectively avoid the problem of bubbles in the finished product.

[0020] Compared with the prior art, the composite material pressurized prepreg molding device, after the air is evacuated in the closed area, performs the second stage of mold closing, the upper pad squeezes the inner insert and squeezes the prepreg toward the upper wall of the convex module to form a molding effect, and when the mold closing is completed, hydraulic oil is injected into the upper part of the piston plate in the pressurizing chamber through the hydraulic pressurizing device to increase the pressure in the pressurizing chamber, and the oil pressure in the pressurizing chamber squeezes the piston plate downward, and then squeezes the inner insert through the push rod, so that the prepreg molding process can be pressurized again, and the pressure acts completely on the resin inside the prepreg stack. By controlling the pressurization pressure of the hydraulic device, quantitative control of the resin pressure inside the prepreg stack can be achieved, ensuring the consistency of process parameters, and thus ensuring the consistency of product quality.

[0021] Compared with the existing technology, the composite material supercharged prepreg molding device has a newly added locking device, which can continuously lock the upper mold and the lower mold during the supercharging process to avoid supercharging failure and effectively improve the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 For the present invention Figure 1 A partial enlarged view of point B in the middle;

[0025] Figure 4 It is a partial sectional view of the internal structure of the mold locking device of the present invention when the mold is not locked;

[0026] Figure 5 This is a schematic diagram of the matching structure of the connecting block, wedge block and locking pin of the present invention;

[0027] Figure 6 It is a partial sectional view of the internal structure of the mold locking device of the present invention when the mold is locked;

[0028] Figure 7 It is a partial cross-sectional view of the interior of the connection structure of the lower die base, the upper die base, the lower die plate, the upper die plate, the upper pad plate and the inner insert block of the present invention;

[0029] Figure 8 For the present invention Figure 7 A partial enlarged view of point C in the middle;

[0030] Fig. 9 For the present invention Figure 7 A partial enlarged view of point D in the middle;

[0031] Fig.10 It is a partial cross-sectional view of the connection structure of the electric telescopic rod and the connecting rod of the present invention;

[0032] Fig.11 It is a partial cross-sectional view of the internal structure of the upper template of the present invention;

[0033] Fig.12 It is a top view schematic diagram of the upper template structure of the present invention;

[0034] Fig.13 It is a schematic cross-sectional view of a local structure of an inner insert block of the present invention;

[0035] Fig.14 It is a partial cross-sectional view of the upper pad, piston plate and push rod connection structure of the present invention.

[0036] Among them, 1. lower die base; 2. upper die base; 3. lower die plate; 301, male die block; 4. upper die plate; 401, female die cavity; 402, step groove; 4021, spring hole; 5. upper pad; 6. clamping die base; 7. hanging pin base; 701, hanging pin hole; 8. backing plate; 9. first cylinder; 10. second cylinder; 11. oil inlet interface; 12. oil return interface; 13. pressure gauge; 14. negative pressure interface; 15. pusher head; 16. connecting block; 17. wedge block; 18. clamping die pin; 19 , rotating shaft; 20, roller; 21, pressurized chamber; 22, piston plate; 23, push rod; 24, negative pressure chamber; 25, electric telescopic rod; 2501, pull rod; 2502, anti-slip block; 26, inner insert; 2601, flange edge; 2602, sink groove; 27, first spring; 28, prepreg; 29, valve plate; 30, suction pipe; 31, connecting rod; 32, second spring; 33, first seal; 34, second seal; 35, third seal; 36, fourth seal. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figures 1 to 14As shown, an embodiment of the present invention provides a composite material supercharged prepreg molding device, including a hydraulic pressure device, a negative pressure pump, and an upper mold base 2 and a lower mold base 1 arranged opposite to each other in the upper and lower directions, the upper wall of the lower mold base 1 is fixedly connected to a lower mold plate 3, the upper wall of the lower mold plate 3 is provided with a convex module 301, the lower wall of the upper mold base 2 is fixedly connected to an upper pad 5 and an upper mold plate 4 in sequence from top to bottom, the inner wall of the upper mold plate 4 is provided with a concave mold cavity 401 that passes through from top to bottom, the convex module 301 is adapted to the inner side wall of the concave mold cavity 401, the inner side wall of the concave mold cavity 401 is slidably connected with an inner insert block 26, and an upper molding surface and a lower molding surface are respectively provided between the inner insert block 26 and the opposite side of the convex module 301 Two groups of sink grooves 2602 are arranged on the lower wall of the inner insert 26, a pressurizing chamber 21 which is connected with the upper wall of the upper pad 5 is arranged inside the upper pad 5, the pressurizing chamber 21 is pressurized by a hydraulic pressurizing device, a group of negative pressure chambers 24 are arranged inside the upper pad 5 and on the left and right sides of the pressurizing chamber 21, respectively, the two groups of negative pressure chambers 24 are respectively opposite to a group of sink grooves 2602, a negative pressure is formed inside the negative pressure chamber 24 by a negative pressure pump, the sink grooves 2602 and the negative pressure chamber 24 are connected by two groups of suction pipes 30, a piston plate 22 is slidably connected inside the pressurizing chamber 21, and a plurality of groups of ejector rods 23 are fixedly connected to the lower wall of the piston plate 22 in a rectangular array, and the plurality of groups of ejector rods 23 are away from the piston plate 22. One end of each of the plurality of push rods 23 penetrates the inner wall of the upper pad 5 and extends into the interior of the concave mold cavity 401. One end of each of the plurality of push rods 23 extending into the interior of the concave mold cavity 401 is fixedly connected to the upper wall of the inner insert 26. In this embodiment, the mold-closing driving device and the laying method of the prepreg 28 are consistent with the prior art. The mold-closing steps are modified in this embodiment, that is, the mold is closed twice. In the first mold-closing stage, the upper and lower molding surfaces are not completely fitted together in order to form a closed area above the prepreg 28. At this time, the closed area can be vacuumed by a negative pressure pump, and at the same time, the uncured resin in the prepreg 28 can be prevented from flowing out. After vacuuming, the second stage of mold closing is performed, and at this time, it is completely closed. That is, the mold clamping device drives the inner insert block 26 and the convex module 301 to mold the prepreg 28, and heats the prepreg 28 in the process to solidify it. At the same time, the hydraulic pressurizing device inputs high-pressure hydraulic oil into the pressurizing chamber 21 to pressurize the top of the piston plate 22. The pressure of the hydraulic oil squeezes the piston plate 22 and drives the push rod 23 to squeeze the inner insert block 26, so that the molding process of the prepreg 28 is pressurized again, and the pressure acts completely on the resin inside the prepreg 28 stack. By controlling the pressurization pressure of the hydraulic device, quantitative control of the resin pressure inside the prepreg 28 stack can be achieved, ensuring the consistency of process parameters and further ensuring the consistency of product quality.

[0039] In order to achieve the purpose of vacuum exhaust, the front wall of the upper pad 5 is distributed on the left and right sides and fixedly connected with two groups of negative pressure interfaces 14 in sequence. The two groups of negative pressure interfaces 14 are respectively connected to a group of negative pressure chambers 24 inside and outside. Both groups of negative pressure interfaces 14 are connected to the negative pressure pump through pipelines. After the first stage of mold closing, the negative pressure chamber 24 is vacuumed through the negative pressure pump through the pipeline and the negative pressure interface 14.

[0040] In order to connect the negative pressure chamber 24 with the closed area formed by the first mold closing when vacuuming, the suction pipe 30 is fixedly connected to the inner wall of the upper pad 5 in an up-and-down through-shape, and the upper end of the suction pipe 30 is connected to the inside of the negative pressure chamber 24, and the lower end of the suction pipe 30 is connected to the inner wall of the inner insert 26 and is slidably connected thereto, and the lower end of the suction pipe 30 is connected to the inside of the sink 2602, and the inner wall of the sink 2602 is slidably connected with a valve plate 29, and a valve driving structure for driving the valve plate 29 to move is provided inside the negative pressure chamber 24, and the valve driving structure includes an electric telescopic rod 25, a connecting rod 26, and a connecting rod 26. Rod 31, connecting rod 31 is fixedly connected to the upper wall of valve plate 29, one end of connecting rod 31 away from valve plate 29 passes through the inner wall of inner insert 26 and is slidably connected thereto, electric telescopic rod 25 is fixedly connected to the lower wall inside negative pressure chamber 24, the extended shaft of electric telescopic rod 25 passes through the inner wall of upper pad 5, the inner wall of inner insert 26 and is slidably connected to the end of connecting rod 31 away from valve plate 29, the extended shaft end of electric telescopic rod 25 is fixedly connected with pull rod 2501, the end of pull rod 2501 away from electric telescopic rod 25 passes through the upper wall of connecting rod 31 and extends to Inside the connecting rod 31, one end of the pull rod 2501 extending into the inside of the connecting rod 31 is fixedly connected to the anti-slip block 2502, and a second spring 32 is arranged on the outer wall of the pull rod 2501 and between the inner upper wall of the connecting rod 31 and the anti-slip block 2502. When vacuuming, the electric telescopic rod 25 extends the shaft and pushes the valve plate 29 through the connecting rod 31, so that the valve plate 29 withdraws from the sink 2602. At this time, the inside of the negative pressure chamber 24 is connected with the inside of the closed area through the suction pipe 30, and the negative pressure pump can vacuum the negative pressure chamber 24 while the closed area The vacuum is simultaneously drawn inside the region to suck away the air inside the prepreg 28 stack. After the vacuum is drawn, the electric telescopic rod 25 drives the valve plate 29 to rise, re-closes the suction pipe 30, and separates the negative pressure chamber 24 from the closed area. The lower wall of the valve plate 29 is flush with the lower wall of the inner insert 26, and together they form the upper molding surface. The second spring 32 is provided so that when the push rod 23 drives the inner insert 26 to move downward during pressurization, the elastic connecting rod 31 of the second spring 32 can move with the pull rod 2501 to a certain extent in the axial direction, so as to avoid the electric telescopic rod 25 from being pulled and damaged;

[0041] In order to realize the movable state of the inner insert 26, step grooves 402 are arranged on the left and right sides of the concave mold cavity 401 and close to the upper wall of the upper mold plate 4, and multiple groups of spring holes 4021 are arranged on the inner lower walls of the two groups of step grooves 402. Flange edges 2601 are arranged on the left and right sides of the inner insert 26, and the two groups of flange edges 2601 are respectively slidably connected with the inner side walls of a group of step grooves 402. A first spring 27 is arranged between the inner lower wall of the spring hole 4021 and the lower wall of the flange edge 2601. The inner insert 26 is elastically moved by the first spring 27. The force is maintained to abut against the lower wall of the upper pad 5. During the second stage of mold closing, the inner insert 26 is lifted up by the first spring 27, and the upper wall of the inner insert 26 abuts against the lower wall of the upper pad 5. The mold closing force drives the upper pad 5 to move downward, and then drives the inner insert 26 to move downward, extruding the prepreg 28. The mold is pressed by the mold closing force. The upper mold plate 4 and the lower mold plate 3 are already in full contact, and the pressure cannot be increased. At this time, the hydraulic pressure device is used to pressurize the upper part of the inner insert 26, driving the inner insert 26 to continue to press against the prepreg 28, thereby achieving the purpose of pressurization;

[0042] In order to achieve re-pressurization after mold closing, the front wall of the upper pad 5 and between the two groups of negative pressure interfaces 14 are fixedly connected with an oil inlet interface 11, an oil return interface 12 and a pressure gauge 13 in a left-right distribution in sequence. The oil inlet interface 11, the oil return interface 12 and the end of the pressure gauge 13 facing the upper pad 5 are all connected to the inside of the pressurization chamber 21. The oil inlet interface 11 and the oil return interface 12 are connected to the hydraulic pressurization device through a pipeline. After the two mold closings are completed, the hydraulic pressurization device injects high-pressure hydraulic oil into the pressurization chamber 21 through the pipeline and the oil inlet interface 11 to pressurize the inside of the pressurization chamber 21, thereby driving the inner insert 26 to extrude the prepreg 28 to form a pressurization action. After the molding is completed, the hydraulic oil is extracted through the oil return interface 12 to restore the internal pressure of the pressurization chamber 21;

[0043] In order to increase the clamping force during pressurization, a clamping device for increasing the clamping force after mold closing is provided between the upper mold plate 4 and the lower mold plate 3. The clamping device includes a clamping seat 6, two sets of pin seats 7 and two sets of clamping pins 18. The clamping seat 6 is fixedly connected to the side wall of the upper mold plate 4, and the lower end of the clamping seat 6 extends toward the lower side of the upper mold plate 4. The two sets of pin seats 7 are fixedly connected to the side wall of the lower mold plate 3 and are respectively located on both sides of the clamping seat 6 in a top view. A cavity penetrating the lower wall is provided inside the clamping seat 6. The two sets of clamping pins 18 are respectively slidably connected to the inner front wall and the inner rear wall of the cavity and are axially opposite. The opposite ends of the two sets of clamping pins 18 penetrate the inner wall of the clamping seat 6, and the end of the pin seat 7 away from the clamping seat 6 is fixedly connected with The back plate 8 and the inner wall of the pin holder 7 are provided with a pin hole 701, the inner cavity size of the pin hole 701 is consistent with the outer wall size of the locking pin 18, the pin hole 701 and the locking pin 18 are axially opposite to each other when the lower mold plate 3 and the upper mold plate 4 are in the mold closing state, and a locking driving structure for driving the locking pin 18 to insert into the pin hole 701 to achieve the locking state is provided between the locking pin 18 and the locking mold holder 6, and an unlocking driving structure for pushing the locking pin 18 out of the pin hole 701 is provided on the side of the back plate 8 away from the pin holder 7. By adding a locking device, the upper mold plate 4 and the lower mold plate 3 can be effectively avoided from being separated when the hydraulic pressure device implements the supercharging, thereby improving the safety of the equipment and ensuring the smooth progress of the supercharging process;

[0044] In order to realize the clamping action, the clamping drive structure includes a first cylinder 9, a connecting block 16, two groups of wedge blocks 17 and two groups of rotating shafts 19. The first cylinder 9 is fixedly connected to the upper wall of the clamping base 6. The end of the first cylinder 9 extending out of the shaft passes through the inner wall of the clamping base 6 and extends into the cavity. The connecting block 16 is fixedly connected to the end of the first cylinder 9 extending into the cavity. The two groups of wedge blocks 17 are fixedly connected to the end of the connecting block 16 away from the first cylinder 9. The ends of the two groups of clamping pins 18 located inside the cavity are slidably connected between the opposite sides of the two groups of wedge blocks 17. The wedge blocks 17 are tapered with a larger top and a smaller bottom. The two groups of rotating shafts 19 are respectively fixedly connected to the inner walls of a group of clamping pins 18 and are both located at the clamping pins 1 8 extends into one end of the cavity, both ends of the rotating shaft 19 penetrate the inner wall of the locking pin 18 and extend toward the two sides of the locking pin 18 respectively, and the ends of the two sets of rotating shafts 19 extending to the outside of the locking pin 18 are rotatably connected with rollers 20, and the circumferential outer walls of the two sets of rollers 20 are respectively connected with the outer walls of a set of wedge blocks 17. When the first cylinder 9 extends the shaft, it drives the connecting block 16 and the wedge block 17 to move downward. When the wedge block 17 moves downward, it squeezes the rollers 20 on the two sets of locking pins 18 through its conical structure, drives the two sets of locking pins 18 to move toward the opposite side, and then inserts them into the two sets of hanging pin holes 701 respectively, and is plugged with the locking base 6 and the hanging pin hole 701 through the locking pin 18 to form a locking force;

[0045] In order to facilitate the release of the locking state, the unlocking drive structure includes a second cylinder 10 and a push head 15. The second cylinder 10 is fixedly connected to the side of the back plate 8 away from the pin seat 7. The second cylinder 10 extends a shaft that penetrates the inner wall of the back plate 8 and extends into the pin hole 701. The push head 15 is fixedly connected to the end of the second cylinder 10 that extends the shaft and extends into the pin hole 701. After the molding is completed, the first cylinder 9 extends the shaft and retracts, driving the connecting block 16 to rise. The second cylinder 10 extends the shaft and extends the locking pin 18 from the pin hole 701 through the push head 15. At this time, the locking state is released and the upper mold plate 4 and the lower mold plate 3 can be separated.

[0046] In order to achieve sealing of each part, the outer wall of the inner insert 26 and the inner wall of the die cavity 401, as well as the outer wall of the male module 301 and the die cavity 401 are sealed by multiple groups of first seals 33, the outer wall of the piston plate 22 and the inner wall of the pressurizing chamber 21 are sealed by the second seal 34, the outer wall of the push rod 23 and the upper pad 5 are sealed by the third seal 35, the groove 2602 and the valve plate 29, as well as the suction pipe 30 and the inner insert 26 are sealed by a group of fourth seals 36 respectively, and the sealing between the connecting parts in the compression molding device is achieved by the first seal 33, the second seal 34, the third seal 35 and the fourth seal 36 to ensure the smooth progress of the vacuum and pressurization operations.

[0047] Working principle: After the first stage of mold closing, the negative pressure chamber 24 is evacuated through the pipeline and the negative pressure interface 14 by the negative pressure pump; when evacuating, the electric telescopic rod 25 extends the shaft and pushes the valve plate 29 through the connecting rod 31, so that the valve plate 29 withdraws from the sink 2602. At this time, the inside of the negative pressure chamber 24 is connected with the inside of the closed area through the suction pipe 30. The negative pressure pump can evacuate the inside of the closed area while evacuating the negative pressure chamber 24, and suck away the air inside the prepreg 28 laminate. After the vacuum suction is completed, the electric telescopic rod 25 drives the valve plate 29 to rise, re-closes the suction pipe 30, and separates the negative pressure chamber 24 from the closed area. The lower wall of the valve plate 29 is flush with the lower wall of the inner block 26, and together they form the upper molding surface. The second spring 32 is provided so that when the push rod 23 drives the inner block 26 to move downward during pressurization, the elastic connecting rod 31 of the second spring 32 can be connected with the pull rod 2501. A certain axial movement can prevent the electric telescopic rod 25 from being pulled and damaged. During the second stage of mold closing, the inner insert 26 is lifted up by the first spring 27, and the upper wall of the inner insert 26 abuts against the lower wall of the upper pad 5. The mold closing force drives the upper pad 5 to move downward, and then drives the inner insert 26 to move downward to extrude the prepreg 28. The mold is pressed by the mold closing force. The upper mold plate 4 and the lower mold plate 3 are already in full contact and the pressure cannot be increased. At this time, the hydraulic pressure device is used to pressurize the upper part of the inner insert 26, driving the inner insert 26 to continue to press against the prepreg 28, thereby achieving the purpose of pressurization. After the two mold closings are completed, the hydraulic pressure device injects high-pressure hydraulic oil into the pressurizing chamber 21 through the pipeline and the oil inlet interface 11, pressurizes the inside of the pressurizing chamber 21, and then drives the inner insert 26 to extrude the prepreg 28 to form a pressurized action. After the molding is completed, the hydraulic oil is extracted through the oil return interface 12 to restore the internal pressure of the pressurizing chamber 21.

[0048] By adding a clamping device, the separation between the upper mold plate 4 and the lower mold plate 3 can be effectively avoided when the hydraulic pressure device is implementing the supercharging, thereby improving the safety of the equipment and ensuring the smooth progress of the supercharging process; when the first cylinder 9 extends the shaft, it drives the connecting block 16 and the wedge block 17 to move downward, and when the wedge block 17 moves downward, it squeezes the rollers 20 on the two sets of clamping pins 18 through its conical structure, driving the two sets of clamping pins 18 to move toward the opposite side, and then respectively insert them into the two sets of hanging pin holes 701, and the clamping pins 18 are simultaneously connected with the clamping seat 6 and the hanging pin hole 701. The pin hole 701 is plugged in to form a locking force. After the compression molding is completed, the first cylinder 9 extends the shaft and retracts, driving the connecting block 16 to rise, and the second cylinder 10 extends the shaft and pushes the locking pin 18 out of the pin hole 701 through the push head 15. At this time, the locking state is released, and the upper mold plate 4 and the lower mold plate 3 can be separated. The first seal 33, the second seal 34, the third seal 35 and the fourth seal 36 are used to achieve sealing between the connecting parts in the compression molding device to ensure the smooth progress of vacuuming and pressurization operations.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite material pressurized prepreg molding device, characterized in that: The invention comprises a hydraulic pressure device, a negative pressure pump, and an upper die base (2) and a lower die base (1) which are arranged in an upper and lower direction relative to each other, wherein the upper wall of the lower die base (1) is fixedly connected to a lower die plate (3), the upper wall of the lower die plate (3) is provided with a convex module (301), the lower wall of the upper die base (2) is fixedly connected to an upper pad (5) and an upper die plate (4) in sequence from top to bottom, a clamping device for increasing the clamping force after mold closing is provided between the upper die plate (4) and the lower die plate (3), and the upper die plate (5) is fixedly connected to the lower wall of the upper die base (2) in sequence from top to bottom. The inner wall of the template (4) is provided with a concave mold cavity (401) which is through from top to bottom, the convex module (301) is adapted to the inner wall of the concave mold cavity (401), the inner wall of the concave mold cavity (401) is slidably connected with an inner insert block (26), an upper molding surface and a lower molding surface are respectively provided between the opposite sides of the inner insert block (26) and the convex module (301), the lower wall of the inner insert block (26) is provided with two groups of sink grooves (2602), and the upper pad (5) is provided with a The upper wall of the upper pad (5) is penetrated by a pressurizing chamber (21), the interior of the pressurizing chamber (21) is pressurized by a hydraulic pressurizing device, a group of negative pressure chambers (24) are respectively arranged inside the upper pad (5) and on the left and right sides of the pressurizing chamber (21), the two groups of negative pressure chambers (24) are respectively opposite to a group of sinks (2602) in the upper and lower directions, a negative pressure is formed inside the negative pressure chamber (24) by a negative pressure pump, and two groups of negative pressure chambers (24) are provided between the sinks (2602) and the negative pressure chamber (24). The suction pipe (30) is passed through, and the inside of the pressurizing chamber (21) is slidably connected to a piston plate (22). The lower wall of the piston plate (22) is fixedly connected to a plurality of push rods (23) in a rectangular array. The ends of the plurality of push rods (23) away from the piston plate (22) all pass through the inner wall of the upper pad (5) and extend into the inside of the die cavity (401). The ends of the plurality of push rods (23) extending into the inside of the die cavity (401) are fixedly connected to the upper wall of the inner insert (26); The front wall of the upper pad (5) is distributed on the left and right sides and is fixedly connected in sequence with two groups of negative pressure interfaces (14), the two groups of negative pressure interfaces (14) are respectively connected to a group of negative pressure chambers (24) inside and outside, and the two groups of negative pressure interfaces (14) are connected to the negative pressure pump through pipelines. The front wall of the upper pad (5) and located between the two groups of negative pressure interfaces (14) are distributed on the left and right sides and are fixedly connected in sequence with an oil inlet interface (11), an oil return interface (12) and a pressure gauge (13), and one end of the oil inlet interface (11), the oil return interface (12) and the pressure gauge (13) facing the upper pad (5) is connected to the inside of the pressurized chamber (21). The oil inlet interface (11) and the oil return interface (12) are connected to the hydraulic pressure device through pipelines, the air intake pipe (30) is fixedly connected to the inner wall of the upper pad (5) in an up-down through-shape, and the upper end of the air intake pipe (30) is connected to the inside of the negative pressure chamber (24), the lower end of the air intake pipe (30) is connected to the inner wall of the inner insert (26) and is slidably connected thereto, the lower end of the air intake pipe (30) is connected to the inside of the sink (2602), the inner wall of the sink (2602) is slidably connected to a valve plate (29), and a valve driving structure for driving the valve plate (29) to move is provided inside the negative pressure chamber (24); The valve driving structure comprises an electric telescopic rod (25) and a connecting rod (31), wherein the connecting rod (31) is fixedly connected to the upper wall of the valve plate (29), and one end of the connecting rod (31) away from the valve plate (29) passes through the inner wall of the inner insert (26) and is slidably connected thereto, and the electric telescopic rod (25) is fixedly connected to the inner lower wall of the negative pressure chamber (24), and an extension shaft of the electric telescopic rod (25) passes through the inner wall of the upper pad (5) and the inner wall of the inner insert (26) and is slidably connected to the end of the connecting rod (31) away from the valve plate (29).

2. A composite material pressurized prepreg molding device according to claim 1, characterized in that: The mold locking device comprises a mold locking seat (6), two groups of pin holders (7) and two groups of mold locking pins (18). The mold locking seat (6) is fixedly connected to the side wall of the upper mold plate (4). The lower end of the mold locking seat (6) extends toward the lower side of the upper mold plate (4). The two groups of pin holders (7) are fixedly connected to the side wall of the lower mold plate (3) and are respectively located on both sides of the mold locking seat (6) in a top view. A cavity penetrating the lower wall is provided inside the mold locking seat (6). The two groups of mold locking pins (18) are respectively slidably connected to the inner front wall and the inner rear wall of the cavity and are axially opposite to each other. The opposite ends of the two groups of mold locking pins (18) penetrate the inner wall of the mold locking seat (6). The pin holders (7) are away from the lock. One end of the mold base (6) is fixedly connected to a back plate (8); the inner wall of the hanging pin seat (7) is provided with a hanging pin hole (701); the inner cavity size of the hanging pin hole (701) matches the outer wall size of the locking pin (18); when the lower mold plate (3) and the upper mold plate (4) are in a mold closing state, the hanging pin hole (701) and the locking pin (18) are axially opposite to each other; a locking drive structure for driving the locking pin (18) to insert into the hanging pin hole (701) to achieve a locked mold state is provided between the locking pin (18) and the locking mold seat (6); and an unlocking drive structure for pushing the locking pin (18) out of the hanging pin hole (701) is provided on a side of the back plate (8) away from the hanging pin seat (7).

3. A composite material pressurized prepreg molding device according to claim 2, characterized in that: The end of the extended shaft of the electric telescopic rod (25) is fixedly connected to a pull rod (2501); one end of the pull rod (2501) away from the electric telescopic rod (25) passes through the upper wall of the connecting rod (31) and extends into the interior of the connecting rod (31); one end of the pull rod (2501) extending into the interior of the connecting rod (31) is fixedly connected to an anti-slip block (2502); a second spring (32) is provided on the outer wall of the pull rod (2501) and between the inner upper wall of the connecting rod (31) and the anti-slip block (2502).

4. A composite material pressurized prepreg molding device according to claim 3, characterized in that: The mold locking drive structure comprises a first cylinder (9), a connecting block (16), two groups of wedge blocks (17) and two groups of rotating shafts (19); the first cylinder (9) is fixedly connected to the upper wall of the mold locking seat (6); the end of the shaft of the first cylinder (9) extends through the inner wall of the mold locking seat (6) and extends into the cavity; the connecting block (16) is fixedly connected to one end of the first cylinder (9) extending into the cavity; the two groups of wedge blocks (17) are fixedly connected to one end of the connecting block (16) away from the first cylinder (9); the ends of the two groups of mold locking pins (18) located inside the cavity are slidably connected to the opposite sides of the two groups of wedge blocks (17); the wedge blocks (17) are in a tapered shape with a larger top and a smaller bottom; the two groups of rotating shafts (19) are respectively fixedly connected to the inner wall of one group of mold locking pins (18) and are both located at one end of the mold locking pin (18) extending into the cavity.

5. A composite material pressurized prepreg molding device according to claim 4, characterized in that: Both ends of the rotating shaft (19) penetrate the inner wall of the locking pin (18) and extend toward both sides of the locking pin (18), and the ends of the two groups of rotating shafts (19) extending to the outside of the locking pin (18) are rotatably connected to rollers (20), and the circumferential outer walls of the two groups of rollers (20) are respectively rollingly connected to the outer walls of a group of wedge blocks (17).

6. A composite material pressurized prepreg molding device according to claim 5, characterized in that: The unlocking drive structure comprises a second cylinder (10) and a push head (15); the second cylinder (10) is fixedly connected to a side of the back plate (8) away from the hanging pin seat (7); a shaft extending from the second cylinder (10) passes through the inner wall of the back plate (8) and extends into the hanging pin hole (701); and the push head (15) is fixedly connected to one end of the shaft extending from the second cylinder (10) and extending into the hanging pin hole (701).

7. A composite material pressurized prepreg molding device according to claim 6, characterized in that: Step grooves (402) are provided on both sides of the concave mold cavity (401) and near the upper wall of the upper mold plate (4); multiple groups of spring holes (4021) are provided on the inner lower walls of the two groups of step grooves (402); flange edges (2601) are provided on both sides of the inner insert block (26); the two groups of flange edges (2601) are slidably connected to the inner wall of one group of step grooves (402) respectively; a first spring (27) is provided between the inner lower wall of the spring hole (4021) and the lower wall of the flange edge (2601); the inner insert block (26) is kept in contact with the lower wall of the upper pad (5) by the elastic force of the first spring (27).

8. A composite material pressurized prepreg molding device according to claim 7, characterized in that: The outer wall of the inner insert (26) and the inner wall of the die cavity (401) as well as the outer wall of the male module (301) and the die cavity (401) are sealed by a plurality of first sealing members (33); the outer wall of the piston plate (22) and the inner wall of the pressurized cavity (21) are sealed by a second sealing member (34); the outer wall of the ejector rod (23) and the upper pad (5) are sealed by a third sealing member (35); the sink (2602) and the valve plate (29) as well as the suction pipe (30) and the inner insert (26) are sealed by a fourth sealing member (36).

Images