Composite material transfer molding die and molding method

Abstract

The present invention provides a composite material transfer molding die and molding method, and relates to the composite material molding technology field. The composite material transfer molding die and molding method include an oven, an upper mold part, a lower mold part, a metal plate, an exhaust device, and a resin pressure injection device. The present invention is provided with an insert device protruding from a convex module, and the metal plate is positioned and lifted by using the insert device, so that the distance between the metal plate and the upper wall of the convex module can be controlled, and the metal plate can be positioned. The product can be processed by clamping once and injecting glue in batches, which solves the problem that a heat-proof layer cannot be molded on a metal plate without holes in the previous technology. The upper mold part is provided with the same insert device as that in the lower mold part, so that the upper and lower surfaces of the metal plate can be positioned and supported, thereby adapting to the production of metal plates that need to be molded with heat-proof layers on both sides.

Description

Technical Field

[0001] The invention relates to the technical field of composite material molding, in particular to a composite material transfer molding die and a molding method. Background Art

[0002] In some special operation fields, due to the high temperature requirements of the equipment working environment, it is necessary to install a fairing insulation on the outside. The fairing must meet certain requirements of pressure resistance, deformation resistance and good subsequent processing performance. The early fairing was made by fixing the lower metal sheet and the upper heat protection layer. The heat protection layer is a composite material formed by fiber reinforcement and resin, and is processed and formed by a composite hydraulic press through a composite molding transfer method.

[0003] There are two general fairing molding process methods. One molding method is to directly transfer the fiber-reinforced resin molding into a heat-resistant layer, and then use bonding to fix the metal sheet and the molded heat-resistant layer. However, under high temperature conditions, bonding is prone to debonding and stratification, so this method cannot connect the metal sheet and the heat-resistant layer well, and the process is complicated.

[0004] The other is to integrally form the metal sheet and the fiber reinforcement through a composite material molding transfer process, that is, directly lay the embedded metal sheet on the appropriate position of the punch of the mold during laying, and then lay the fiber reinforcement on the concave mold of the mold. After closing the mold, the composite material molding transfer is used for molding. This molding method does not have positioning when laying the metal sheet, resulting in inaccurate positioning between the fiber reinforcement and the metal sheet, and easily forming an edge effect during the molding process, which leads to easy stratification between the metal sheet and the heat protection layer after molding, and uneven thickness of the molded parts.

[0005] To this end, there is a publicly available technology on the market that proposes a resin molding transfer process forming method and mold for a cable fairing, which is used to integrally form metal sheets and heat protection layers. The forming method includes mold processing, pre-embedding of metal sheets, laying of fiber reinforcements, mold assembly, connecting pipelines, airtightness inspection, resin heating, mold heating, resin pressurized injection, and demolding steps after curing; the forming mold includes a lower pressure plate, a punch, a die, an upper pressure plate, a sealing ring, a glue injection joint, a small nut, a screw, a large nut, and a glue outlet joint. The cavities of the die and the punch match the shape of the cable fairing; a rectangular sealing groove for installing a sealing ring is provided on the contact surface of the punch, the die, the lower pressure plate, and the punch. The forming efficiency is high and the quality is stable using this method and mold;

[0006] However, with the gradual improvement of product process requirements, some metal plates used for insulation do not have through holes, and both the upper and lower surfaces require molded heat-proof layers. The above-mentioned public technology cannot process such products. Therefore, it is necessary to improve and optimize the composite material transfer molding mold and molding method. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a composite material transfer molding die and a molding method, which solves the problem that the composite material transfer molding die and the molding method in the prior art cannot position metal plates without through holes during the composite material transfer molding process and cannot be used for molding heat-resistant layers on both sides of metal plates.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a composite material transfer molding die, comprising an oven, an upper mold part, a lower mold part, a metal plate, an exhaust device and a resin pressure injection device, the upper wall and the lower wall of the metal plate are both provided with positioning grooves for positioning, the lower mold part comprises a lower mold base, the upper wall of the lower mold base is fixedly connected with a pad, a lower mold plate and a convex module in sequence from bottom to top, the upper mold part comprises an upper mold base and a concave module arranged on the lower wall of the upper mold base and adapted to the convex module, a sealing strip for sealing is arranged between the concave module and the upper wall of the lower mold plate, a clearance hole which passes through from top to bottom is arranged on the inner wall of the lower mold base, a pipe hole is provided in a through shape between the side wall of the lower mold base and the clearance hole, a glue injection nozzle is fixedly connected to the end of the pipe injection hole away from the clearance hole, and the glue injection nozzle A high-pressure connecting pipe is fixedly connected to the end facing the inside of the pipe hole, and an insert device for supporting and positioning the metal plate is provided on the inner wall of the convex module. The end of the high-pressure connecting pipe away from the injection nozzle passes through the pipe hole and the avoidance hole in sequence and is fixedly connected to the insert device. The suction end of the vacuum device and the output end of the resin pressurized injection device are connected to the end of the injection nozzle away from the lower mold base through an electrically controlled reversing valve. A movable groove that passes through the front and back is provided on the lower wall of the pad, and a movable plate is slidably connected to the inner side wall of the movable groove. The front and rear side ends of the movable plate extend to the front and back sides of the pad respectively, and a lifting and lowering driving structure for driving the movable plate to move up and down is provided between the lower mold base and the end of the movable plate extending to the outside of the pad, and a avoidance hole that passes through the upper and lower parts is provided on the inner wall of the lower template, and the avoidance hole is opposite to the movable plate up and down.

[0009] Preferably, the insert device includes an inner insert and an outer insert, the outer insert is slidably connected to the inner wall of the convex module in an up and down through-through shape, and one end of the outer insert extending to the upper wall of the convex module is consistent with the inner cavity size of the positioning groove on the lower wall of the metal plate, the inner insert is slidably connected to the inner wall of the outer insert, and the end of the high-pressure connecting pipe away from the injection nozzle is fixedly connected to the lower end of the inner insert, the inner insert is composed of a first insert column and a first flange plate, the first insert column is slidably connected to the inner wall of the outer insert, and the first flange plate is arranged at the lower end of the first insert column, and the outer insert is composed of a second insert column and a second flange plate, the second insert column is slidably connected to the inner wall of the convex module, and the second flange plate is arranged at the lower end of the second insert column, the first flange plate and the second flange plate are both located inside the avoidance hole, a first linkage structure is arranged between the second flange plate and the movable plate, and a second linkage structure is arranged between the first flange plate and the second flange plate.

[0010] Preferably, the inner insert is provided with a glue injection hole which penetrates the lower wall of the inner insert, the high-pressure connecting pipe is connected with the inside of the glue injection hole, the upper side wall of the inner insert is provided with a first injection hole which penetrates the inside of the glue injection hole, and the outer wall of one end of the outer insert extending to the upper side of the convex module is provided with a second injection hole which penetrates inside and outside.

[0011] Preferably, the inner side wall of the convex module is provided with an insert hole which passes through from top to bottom, and two groups of second wear-resistant rings are sequentially arranged on the inner side wall of the insert hole in an upper and lower distribution manner, and the inner side walls of the two groups of second wear-resistant rings are slidingly connected to the circumferential outer wall of the second insert column, and a third seal is provided on the inner side wall of the insert hole and above the two groups of second wear-resistant rings, and the insert hole and the second insert column are sealed by the third seal.

[0012] Preferably, the inner wall of the outer insert is provided with a matching hole which passes through from top to bottom, and two groups of first wear-resistant rings are sequentially arranged on the inner wall of the matching hole in an upper and lower distribution manner, and the inner walls of the two groups of the first wear-resistant rings are slidingly connected to the circumferential outer wall of the first insert column, and the first seal and the second seal are sequentially arranged on the inner wall of the matching hole and located above the two groups of first wear-resistant rings from bottom to top.

[0013] Preferably, a conical surface is provided at one end of the first insert column away from the first flange plate, and the end of the first injection hole away from the injection hole is connected to the conical surface. The upper mouth of the matching hole is provided with a conical mouth matched with the conical surface of the first insert column, and the end of the second injection hole facing the axis of the second insert column is connected to the inside of the conical mouth and the horizontal height of the second injection hole is located below the second sealing member. The circumferential outer wall of the first insert column and the inner side wall of the matching hole are sealed by the first sealing member, and the conical surface of the first insert column is sealed by the second sealing member when matching with the conical mouth of the matching hole.

[0014] Preferably, the lifting drive structure includes a cylinder and a top plate, the upper wall of the lower mold base and the left and right sides of the movable plate are fixedly connected with pads, the upper walls of the two groups of pads are fixedly connected with a group of support plates, the top plate is fixedly connected to the upper ends of the two groups of support plates, the cylinder is fixedly connected to the lower wall of the top plate and is located between the two groups of support plates, and the end of the cylinder extending shaft is fixedly connected to the end of the movable plate extending to the outside of the pad.

[0015] Preferably, the first linkage structure includes multiple groups of first push rods and second push rods, multiple groups of the first push rods are fixedly connected to the lower wall of the second flange plate and are all located at the periphery of the first flange plate, multiple groups of the first push rods one end away from the second flange plate all penetrate the upper wall of the pad plate and extend into the movable groove, multiple groups of the first push rods one end extending into the movable groove are fixedly connected to the upper wall of the movable plate, after the lower wall of the movable plate abuts against the upper wall of the lower mold base, the upper wall of the second insert column is flush with the upper wall of the convex module, multiple groups of the second push rods are fixedly connected to the lower wall of the first flange plate, multiple groups of the second push rods one end away from the first flange plate all penetrate the inner wall of the pad plate and the inner wall of the movable plate in turn and extend to the lower side of the movable plate, the upper wall of the lower mold base and the upper part opposite to the lower ends of the multiple groups of second push rods are fixedly connected with wear-resistant blocks, the vertical distance between the lower end of the second push rod and the lower wall of the movable plate is consistent with the vertical distance between the upper wall of the first insert column and the upper wall of the second insert column.

[0016] Preferably, the second linkage structure includes a spring, a hanging pin and an anti-slip head, a mounting hole is provided on the upper wall of the first flange plate, the spring is arranged on the inner wall of the mounting hole, the upper end of the spring abuts against the lower wall of the second flange plate, a step hole is provided on the inner wall of the first flange plate and located outside the mounting hole, the hanging pin is fixedly connected to the lower wall of the second flange plate and is opposite to the step hole up and down, the end of the hanging pin away from the second flange plate passes through the inner wall of the first flange plate and extends into the step hole, the anti-slip head is arranged at the end of the hanging pin extending into the step hole, the first flange plate and the second flange plate are kept separated by the spring, and the first flange plate is connected to the second flange plate via the hanging pin and the anti-slip head.

[0017] According to the above-mentioned molding method of a composite material transfer molding die, the molding method comprises the following steps:

[0018] S1. Apply a release agent on the opposite sides of the male module and the female module, lay a part of the fiber reinforcement on the upper wall of the male module and the other part in the female module, place the metal sheet on the upper wall of the male module, and position and support it by putting the positioning groove on the second insert column protruding from the upper wall of the male module;

[0019] S2, mold closing, closing the upper mold part and the lower mold part, and locking them, the lower mold plate and the concave mold block are sealed by a sealing strip, the electric control reversing valve is switched to the air extraction device connected to the high-pressure connecting pipe, and the air extraction device sucks away the air near the metal plate through the high-pressure connecting pipe, the glue injection hole, the first injection hole and the second injection hole;

[0020] S3, glue injection, the mold is heated to the resin melting temperature in an oven, and the resin pressure injection device is switched to the high-pressure connecting pipe through the electric control reversing valve. The resin pressure injection device measures the heated and melted resin and injects it into the space between the male module and the female module through the high-pressure connecting pipe, the glue injection hole, the first injection hole and the second injection hole to infiltrate the fiber reinforcement to form a composite material and wrap the metal plate. After reaching the specified injection amount, it is cooled for 20 minutes for pre-curing;

[0021] S4, core pulling, after pre-curing is completed, the cylinder extends the shaft to drive the movable plate to move downward. During the moving process of the movable plate, the outer insert is driven to move downward synchronously by multiple groups of first push rods, and the outer insert drives the inner insert to move downward synchronously. The second injection hole is shielded by the side wall of the insert hole. While the movable plate moves downward, the resin pressure injection device continues to meter the heated and melted resin and inject it into the cavity formed after the outer insert and the inner insert move downward through the high-pressure connecting pipe, the injection hole, and the first injection hole. After the multiple groups of second push rods on the lower wall of the inner insert contact the anti-wear block, they no longer move downward. The movable plate and the outer insert continue to move downward, and the cylinder extends the shaft to push the movable plate to the lower wall of the movable plate and abut against the upper wall of the lower mold seat. At this time, the cavity formed after the inner insert and the outer insert move downward is filled with resin that enters the cavity from between the cone surface and the cone head. At the same time, the upper end of the inner insert and the upper end of the outer insert are flush with the upper wall of the convex module, and pressurization begins between the upper mold part and the lower mold part;

[0022] S5. After the core pulling is completed, the mold is pushed back into the oven for heating and cooled to room temperature again. The finished product is taken out after the mold is opened.

[0023] The present invention provides a composite material transfer molding die and molding method, which has the following beneficial effects:

[0024] Compared with the existing technology, the composite material transfer molding die and molding method are provided with an insert device protruding from the convex module. The insert device is used to position and lift the metal plate, so as to control the distance between the metal plate and the upper wall of the convex module and position the metal plate. The product is processed by clamping once and injecting glue in batches, which solves the problem that the heat protection layer cannot be molded on the metal plate without holes in the previous technology.

[0025] Compared with the prior art, the composite material transfer molding die and molding method has an upper mold part provided with the same insert device as that in the lower mold part, so that the upper and lower surfaces of the metal plate can be positioned and supported, thereby adapting to the production of metal plates that require molded heat protection layers on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0028] Figure 3 It is a partial cross-sectional view of the interior of the connection structure of the lower die base, the backing plate, the lower die plate, the lower die block and the insert device of the present invention;

[0029] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0030] Figure 5 For the present invention Figure 3 A partial enlarged view of point C in the middle;

[0031] Figure 6 It is a partial cross-sectional schematic diagram of the internal structure of the outer insert of the present invention;

[0032] Figure 7 It is a partial cross-sectional schematic diagram of the internal structure of the inner insert of the present invention;

[0033] Figure 8 It is a partial cross-sectional schematic diagram of the internal structure of the convex module of the present invention.

[0034] Among them, 1. metal plate; 101. positioning groove; 2. lower die seat; 201. clearance hole; 202. pipe hole; 3. pad; 301. movable groove; 4. lower template; 401. avoidance hole; 5. convex module; 6. injection nozzle; 7. pad; 8. support plate; 9. top plate; 10. cylinder; 11. movable plate; 12. high-pressure connecting pipe; 13. anti-wear block; 14. insert hole; 15. inner insert; 1501. first insert column; 1502. first method Lanzhou plate; 16, external insert; 1601, second insert column; 1602, second flange plate; 17, first push rod; 18, second push rod; 19, glue injection hole; 20, first injection hole; 21, matching hole; 22, second injection hole; 23, first wear-resistant ring; 24, first seal; 25, second seal; 26, second wear-resistant ring; 27, third seal; 28, step hole; 29, hanging pin; 30, anti-slip head; 31, mounting hole; 32, spring. DETAILED DESCRIPTION

[0035] 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.

[0036] like Figures 1 to 8 As shown, an embodiment of the present invention provides a composite material transfer molding die, including an oven, an upper die part, a lower die part, a metal plate 1, an exhaust device and a resin pressure injection device, the upper wall and the lower wall of the metal plate 1 are both provided with positioning grooves 101 for positioning, the lower die part includes a lower die base 2, the upper wall of the lower die base 2 is fixedly connected with a pad 3, a lower mold plate 4, and a convex mold plate 5 in sequence from bottom to top, the upper die part includes an upper die base and a concave mold plate arranged on the lower wall of the upper die base and adapted to the convex mold plate 5, a sealing strip for sealing is arranged between the concave mold plate and the upper wall of the lower mold plate 4, and the inner wall of the lower die base 2 is provided with There is a clearance hole 201 that passes through from top to bottom, and a pipe hole 202 is set in a through shape between the side wall of the lower mold base 2 and the clearance hole 201. The end of the pipe hole 202 away from the clearance hole 201 is fixedly connected with a glue injection nozzle 6, and the end of the glue injection nozzle 6 facing the inside of the pipe hole 202 is fixedly connected with a high-pressure connecting pipe 12. The inner wall of the convex module 5 is provided with an insert device for supporting and positioning the metal plate 1. The end of the high-pressure connecting pipe 12 away from the glue injection nozzle 6 passes through the pipe hole 202 and the clearance hole 201 in sequence and is fixedly connected to the insert device. The suction end of the vacuum device is connected to the output end of the resin pressurized injection device. The electronically controlled reversing valve is connected to the end of the glue injection nozzle 6 away from the lower mold base 2. The lower wall of the pad 3 is provided with a movable groove 301 that runs through the front and back. The inner wall of the movable groove 301 is slidably connected with a movable plate 11. The front and rear ends of the movable plate 11 extend to the front and rear sides of the pad 3 respectively. The inner wall of the lower mold plate 4 is provided with an avoidance hole 401 that runs through the upper and lower parts. The avoidance hole 401 is opposite to the movable plate 11 up and down; the insert device includes an inner insert 15 and an outer insert 16. In this embodiment, the upper mold part and the lower mold part are basically consistent with the structure of the composite material transfer molding mold in the prior art. In this embodiment, The focus is on improving and optimizing the support and positioning of the metal sheet 1. The metal sheet 1 is positioned and supported by the insert device. While positioning and supporting, the melted resin is injected into the mold cavity through the insert device. After pre-cooling, the metal sheet 1 is wrapped by the first injected resin. Then, the insert device is withdrawn while continuing to inject glue. The resin is injected into the cavity left after the insert device is withdrawn. After pressurization, the whole is sent into an oven for heating, cooling, curing and molding. The problem that the metal sheet 1 without holes cannot be positioned during molding and the problem that the metal sheet 1 cannot be molded on both sides are solved.

[0037] In order to support and position the metal sheet 1, the outer insert 16 is slidably connected to the inner wall of the male module 5 in an up-and-down through shape. The end of the outer insert 16 extending to the upper wall of the male module 5 matches the inner size of the positioning groove 101 on the lower wall of the metal sheet 1. The upper mold part is provided with an insert device that is the same as the insert device of the lower mold part. The specific structure and distance are the same. In this embodiment, only the insert device of the lower mold part is described in detail. In the initial state, the outer insert 16 protrudes from the upper wall of the male module 5. The protruding height of the outer insert 16 can be controlled by controlling the extension length of the cylinder 10 to control the distance between the metal sheet 1 and the upper wall of the male module 5 after being lifted by the outer insert 16. After the positioning groove 101 on the metal sheet 1 is sleeved on the upper end of the outer insert 16, a positioning effect is formed. During the injection process, the metal sheet 1 will not be driven to deviate by the flowing resin;

[0038] In order to facilitate resin injection, the inner insert 15 is slidably connected to the inner wall of the outer insert 16, and the end of the high-pressure connecting pipe 12 away from the injection nozzle 6 is fixedly connected to the lower end of the inner insert 15. The inner insert 15 is composed of a first insert column 1501 and a first flange plate 1502. The first insert column 1501 is slidably connected to the inner wall of the outer insert 16, and the first flange plate 1502 is arranged at the lower end of the first insert column 1501. The outer insert 16 is composed of a second insert column 1601 and a second flange plate 1602. The second insert column 1601 is slidably connected to the inner wall of the convex module 5, and the second flange plate 1602 is arranged at the lower end of the second insert column 1601. The first flange plate 1502, The second flange plate 1602 is located inside the avoidance hole 401, the inner insert 15 is provided with a glue injection hole 19 that penetrates the lower wall of the inner insert 15, the high-pressure connecting pipe 12 penetrates the inside of the glue injection hole 19, the upper side wall of the inner insert 15 is provided with a first injection hole 20 that penetrates the inside of the glue injection hole 19, and the outer wall of the outer insert 16 that extends to the upper side of the male module 5 is provided with a second injection hole 22 that penetrates inside and outside. The heated resin is pressurized by the resin pressurization injection device and then enters the high-pressure connecting pipe 12 from the glue injection nozzle 6, enters the glue injection hole 19 along the high-pressure connecting pipe 12, and enters between the male module 5 and the metal plate 1 through the first injection hole 20 and the second injection hole 22;

[0039] In order to control the flow direction of the glue during injection, the inner wall of the convex module 5 is provided with an insert hole 14 which is through from top to bottom. The inner wall of the insert hole 14 is provided with two groups of second wear-resistant rings 26 which are distributed up and down in sequence. The inner walls of the two groups of second wear-resistant rings 26 are both slidably connected with the circumferential outer wall of the second insert column 1601. A third sealing member 27 is provided on the inner wall of the insert hole 14 and above the two groups of second wear-resistant rings 26. The insert hole 14 and the second insert column 1601 are sealed by the third sealing member 27. During the first injection of glue, the third sealing member 27 is used to seal so that the melted resin will not overflow from between the inner wall of the insert hole 14 and the outer wall of the second insert column 1601. The two groups of second wear-resistant rings 26 can reduce the wear between the inner wall of the insert hole 14 and the outer wall of the second insert column 1601.

[0040] In order to further control the flow direction of the injected glue, the inner wall of the outer insert 16 is provided with a matching hole 21 which passes through from top to bottom. The inner wall of the matching hole 21 is distributed up and down and is provided with two groups of first wear-resistant rings 23 in sequence. The inner walls of the two groups of first wear-resistant rings 23 are both slidably connected with the circumferential outer wall of the first insert column 1501. The inner wall of the matching hole 21 and above the two groups of first wear-resistant rings 23 are provided with a first seal 24 and a second seal 25 in sequence from bottom to top. The two groups of first wear-resistant rings 23 can reduce the wear between the circumferential outer wall of the first insert column 1501 and the inner wall of the matching hole 21. The end of the first insert column 1501 away from the first flange plate 1502 is provided with a conical surface, and the end of the first injection hole 20 away from the injection hole 19 passes through the conical surface. The upper mouth of the matching hole 21 is provided with a conical mouth adapted to the conical surface of the first insert column 1501. One end facing the axis of the second insert column 1601 is connected with the inside of the cone mouth and the horizontal height of the second injection hole 22 is located below the second sealing member 25. The outer wall of the circumference of the first insert column 1501 and the inner wall of the matching hole 21 are sealed by the first sealing member 24. When the conical surface of the first insert column 1501 is matched with the cone mouth of the matching hole 21, it is sealed by the second sealing member 25. During the first injection of glue, the outer wall of the first insert column 1501 and the inner wall of the matching hole 21 are sealed by the first sealing member 24. During the second injection of glue, after the conical surface of the first insert column 1501 contacts the second sealing member 25, the injection direction no longer enters the second injection hole 22 from the first injection hole 20, but is redirected from the first injection hole 20 to enter between the conical surface and the cone mouth and output from the upper mouth of the matching hole 21, and enter the cavity formed after the insert device is separated from the metal plate 1, so as to realize the second injection of glue;

[0041] In order to drive the lifting and lowering action of the insert device, a lifting and lowering driving structure for driving the movable plate 11 to move up and down is arranged between the lower die base 2 and one end of the movable plate 11 extending to the outside of the pad 3, and a first linkage structure is arranged between the second flange plate 1602 and the movable plate 11. The lifting and lowering driving structure includes a cylinder 10 and a top plate 9. The upper wall of the lower die base 2 and the left and right sides of the movable plate 11 are fixedly connected with pads 7, and the upper walls of the two groups of pads 7 are fixedly connected with a group of support plates 8. The top plate 9 is fixedly connected to the upper ends of the two groups of support plates 8. The cylinder 10 is fixedly connected to the lower wall of the top plate 9 and is located between the two groups of support plates 8. The end of the cylinder 10 extending out of the shaft is connected to the movable plate 11. The end extending to the outside of the pad 3 is fixedly connected, and the first linkage structure includes multiple groups of first push rods 17 and second push rods 18. The multiple groups of first push rods 17 are fixedly connected to the lower wall of the second flange plate 1602 and are all located on the periphery of the first flange plate 1502. The ends of the multiple groups of first push rods 17 away from the second flange plate 1602 all penetrate the upper wall of the pad 3 and extend into the movable groove 301. The ends of the multiple groups of first push rods 17 extending into the movable groove 301 are fixedly connected to the upper wall of the movable plate 11. After the lower wall of the movable plate 11 abuts against the upper wall of the lower mold base 2, the upper wall of the second insert column 1601 is flush with the upper wall of the convex module 5. The multiple groups of second push rods 18 are fixed Connected to the lower wall of the first flange plate 1502, the ends of the multiple sets of second push rods 18 away from the first flange plate 1502 all penetrate the inner wall of the pad 3 and the inner wall of the movable plate 11 in sequence and extend to the lower side of the movable plate 11. The upper wall of the lower mold base 2 and the upper and lower opposite positions of the multiple sets of second push rods 18 are fixedly connected with anti-wear blocks 13. The vertical distance between the lower end of the second push rod 18 and the lower wall of the movable plate 11 is consistent with the vertical distance between the upper wall of the first insert column 1501 and the upper wall of the second insert column 1601. The cylinder 10 extends the shaft to extend, driving the movable plate 11 to descend, and then driving the outer insert 16 to descend through the multiple sets of first push rods 17. During the first injection of glue After precooling, the position of the metal sheet 1 can be maintained by the first injected resin that is initially solidified after precooling, so that the outer insert 16 can be separated from the metal sheet 1. At the same time, after the inner insert 15 and the outer insert 16 are completely pulled out, they are flush with the upper wall of the male module 5, thereby forming a complete male mold cavity surface and maintaining the surface integrity of the finished product. The inner insert 15 can stop moving earlier than the outer insert 16 through the second ejector 18 that is separately provided, and then the flow direction of the resin is changed by the gradual fitting of the conical surface and the conical mouth in combination with the second sealing member 25, so that the resin flows toward the positioning groove 101 of the metal sheet 1 to supplement the cavity formed after the insert device is withdrawn;

[0042] In order to maintain the distance between the cone mouth and the cone surface during the first injection of glue, a second linkage structure is arranged between the first flange plate 1502 and the second flange plate 1602, and the second linkage structure includes a spring 32, a hanging pin 29 and an anti-slip head 30. A mounting hole 31 is arranged on the upper wall of the first flange plate 1502, and the spring 32 is arranged on the inner wall of the mounting hole 31. The upper end of the spring 32 abuts against the lower wall of the second flange plate 1602. A step hole 28 is arranged on the inner wall of the first flange plate 1502 and located on the outside of the mounting hole 31. The hanging pin 29 is fixedly connected to the lower wall of the second flange plate 1602 and is opposite to the step hole 28 up and down, and the hanging pin 29 is away from the second flange One end of plate 1602 passes through the inner wall of the first flange plate 1502 and extends into the stepped hole 28. The anti-slip head 30 is arranged at one end of the hanging pin 29 extending into the stepped hole 28. The first flange plate 1502 and the second flange plate 1602 are kept separated by the spring 32. The first flange plate 1502 is connected to the second flange plate 1602 through the hanging pin 29 and the anti-slip head 30. The first flange plate 1502 is suspended under the outer insert 16 through the anti-slip head 30, and the distance between the cone mouth and the cone surface is maintained during the first injection of glue by the spring 32, ensuring that the resin can enter the second injection hole 22 from the first injection hole 20 during the first injection of glue.

[0043] According to the above-mentioned molding method of a composite material transfer molding die, the molding method comprises the following steps:

[0044] S1. Apply a release agent on the opposite side of the male module 5 and the female module, lay a part of the fiber reinforcement on the upper wall of the male module 5 and the other part in the female module, place the metal plate 1 on the upper wall of the male module 5, and position and support it by putting the positioning groove 101 on the end of the second insert column 1601 protruding from the upper wall of the male module 5;

[0045] S2, mold closing, close the upper mold part and the lower mold part, and lock them, the lower mold plate 4 and the concave mold block are sealed by a sealing strip, the electric control reversing valve is switched to the air extraction device connected to the high-pressure connecting pipe 12, and the air extraction device sucks away the air near the metal plate 1 through the high-pressure connecting pipe 12, the injection hole 19, the first injection hole 20 and the second injection hole 22;

[0046] S3, glue injection, the mold is heated to the resin melting temperature in an oven, and the mold is switched to the resin pressure injection device and connected to the high-pressure connecting pipe 12 through the electric control reversing valve. The resin pressure injection device measures the heated and melted resin and injects it into the space between the male module 5 and the female module through the high-pressure connecting pipe 12, the glue injection hole 19, the first injection hole 20 and the second injection hole 22 to infiltrate the fiber reinforcement to form a composite material and wrap the metal plate 1. After reaching the specified injection amount, it is cooled for 20 minutes for pre-curing;

[0047] S4, core pulling, after pre-curing is completed, the cylinder 10 extends the shaft to drive the movable plate 11 to move downward. During the downward movement of the movable plate 11, the outer insert 16 is driven to move downward synchronously by multiple sets of first push rods 17, and the outer insert 16 drives the inner insert 15 to move downward synchronously. The second injection hole 22 is shielded by the side wall of the insert hole 14. While the movable plate 11 moves downward, the resin pressure injection device continues to meter the heated and melted resin through the high-pressure connecting pipe 12, the injection hole 19, and the first injection hole 20 toward the outer insert 16 and the inner insert 15. The resin is injected into the cavity that appears. After the multiple sets of second push rods 18 on the lower wall of the inner insert 15 contact the anti-wear block 13, they stop moving downward. The movable plate 11 and the outer insert 16 continue to move downward. The cylinder 10 extends the shaft and pushes the movable plate 11 to move until the lower wall of the movable plate 11 abuts against the upper wall of the lower die seat 2. At this time, the cavity that appears after the inner insert 15 and the outer insert 16 move downward is filled with resin that enters the cavity from between the cone surface and the cone head. At the same time, the upper end of the inner insert 15 and the upper end of the outer insert 16 are flush with the upper wall of the convex module 5, and pressure begins to be applied between the upper die portion and the lower die portion.

[0048] S5. After the core pulling is completed, the mold is pushed back into the oven for heating and cooled to room temperature again. The finished product is taken out after the mold is opened.

[0049] Working principle: In this embodiment, the upper mold part and the lower mold part are basically consistent with the structure of the composite material transfer molding mold in the prior art. This embodiment focuses on improving and optimizing the support and positioning of the metal plate 1. The metal plate 1 is positioned and supported by the insert device. While positioning and supporting, the melted resin is injected into the mold cavity through the insert device. After pre-cooling, the metal plate 1 is impregnated with the fiber reinforcement by the first injected resin to form a composite material wrapping, and then the insert device continues to inject glue while withdrawing, and the resin is injected into the cavity left after the insert device is withdrawn. After pressurization, the whole is sent into the oven for heating, cooling, curing and molding, which solves the problem that the metal plate 1 without holes cannot be positioned during molding and the problem that the metal plate 1 cannot be double-sided molded;

[0050] In the initial state, the outer insert 16 protrudes from the upper wall of the male module 5. The protruding height of the outer insert 16 can be controlled by controlling the extension length of the cylinder 10, so as to control the distance between the metal plate 1 and the upper wall of the male module 5 after being lifted by the outer insert 16. After the positioning groove 101 on the metal plate 1 is sleeved on the upper end of the outer insert 16, a positioning effect is formed. During the injection process, the metal plate 1 will not be driven and deviated by the flowing resin; the heated resin is pressurized by the resin pressure injection device and then enters the high-pressure connecting pipe 12 from the injection nozzle 6, enters the injection hole 19 along the high-pressure connecting pipe 12, and passes through the first injection hole 20 and the second injection hole 22 enters between the convex module 5 and the metal plate 1; during the first injection of glue, the third seal 27 is used to seal, so that the molten resin will not overflow from between the inner wall of the insert hole 14 and the outer wall of the second insert column 1601. The two sets of second wear-resistant rings 26 can reduce the wear between the inner wall of the insert hole 14 and the outer wall of the second insert column 1601; during the first injection of glue, the first seal 24 is used to seal between the outer wall of the first insert column 1501 and the inner wall of the matching hole 21. During the second injection of glue, after the conical surface of the first insert column 1501 contacts the second seal 25, the injection direction no longer enters the second injection hole from the first injection hole 20 The perforation 22 is redirected from the first injection hole 20 into the space between the conical surface and the conical mouth and output from the upper mouth of the matching hole 21, and enters the cavity formed after the insert device is separated from the metal plate 1, so as to realize the secondary injection of glue; the cylinder 10 extends the shaft to make an extension action, driving the movable plate 11 to descend, and then driving the outer insert 16 to descend through multiple sets of first push rods 17. After the first injection of glue is pre-cooled, the position of the metal plate 1 can be maintained by the fixing inside which the resin injected for the first time is initially solidified after pre-cooling, so that the outer insert 16 can be separated from the metal plate 1, and at the same time, after the inner insert 15 and the outer insert 16 are completely pulled out, they are flush with the upper wall of the convex module 5, and then the outer insert 16 is separated from the metal plate 1. A complete convex mold cavity surface is formed to maintain the surface integrity of the finished product. The inner insert 15 can stop moving earlier than the outer insert 16 through the separately arranged second push rod 18, and then the flow direction of the resin is changed through the gradual fitting of the conical surface and the conical mouth combined with the second sealing member 25, so that the resin flows toward the positioning groove 101 of the metal sheet 1 to supplement the cavity formed after the insert device is withdrawn; the first flange plate 1502 is suspended under the outer insert 16 through the anti-slip head 30, and the distance between the conical mouth and the conical surface during the first injection is maintained by the spring 32, ensuring that the resin can enter the second injection hole 22 from the first injection hole 20 during the first injection.

[0051] 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 transfer molding die, characterized in that: The invention comprises an oven, an upper die part, a lower die part, a metal plate (1), an exhaust device and a resin pressure injection device, wherein the upper wall and the lower wall of the metal plate (1) are both provided with positioning grooves (101) for positioning, the lower die part comprises a lower die base (2), the upper wall of the lower die base (2) is fixedly connected with a backing plate (3), a lower mold plate (4) and a male mold block (5) in sequence from bottom to top, the upper die part comprises an upper die base and a female mold block provided on the lower wall of the upper die base and adapted to the male mold block (5), the female mold block A sealing strip for sealing is arranged between the upper wall of the lower mold plate (4); a clearance hole (201) penetrating from top to bottom is arranged on the inner wall of the lower mold base (2); a pipe passage hole (202) is arranged in a penetrating shape between the side wall of the lower mold base (2) and the clearance hole (201); an end of the pipe passage hole (202) away from the clearance hole (201) is fixedly connected to a glue injection nozzle (6); an end of the glue injection nozzle (6) facing the inside of the pipe passage hole (202) is fixedly connected to a high-pressure connecting pipe (12); The inner wall of the convex module (5) is provided with an insert device for supporting and positioning the metal plate (1); the end of the high-pressure connecting pipe (12) away from the glue injection nozzle (6) passes through the pipe running hole (202) and the clearance hole (201) in sequence and is fixedly connected to the insert device; the suction end of the vacuum device and the output end of the resin pressurized injection device are connected to the end of the glue injection nozzle (6) away from the lower mold base (2) through an electric control reversing valve; the lower wall of the pad (3) is provided with a movable groove (301) that runs through from front to back, The inner wall of the movable groove (301) is slidably connected to a movable plate (11), and the front and rear side ends of the movable plate (11) extend to the front and rear sides of the pad (3) respectively. A lifting and lowering driving structure for driving the movable plate (11) to move up and down is provided between the lower mold base (2) and one end of the movable plate (11) extending outside the pad (3), and the inner wall of the lower mold plate (4) is provided with a vertically penetrating avoidance hole (401), and the avoidance hole (401) is vertically opposite to the movable plate (11); The insert device comprises an inner insert (15) and an outer insert (16), wherein the outer insert (16) is slidably connected to the inner wall of the male module (5) in an up-and-down through-shape, and one end of the outer insert (16) extending to the upper wall of the male module (5) matches the inner cavity size of the positioning groove (101) on the lower wall of the metal plate (1), and the inner insert (15) is slidably connected to the inner wall of the outer insert (16), and one end of the high-pressure connecting pipe (12) away from the injection nozzle (6) is fixedly connected to the lower end of the inner insert (15), and the inner insert (15) is composed of a first insert column (1501) and a first flange plate (1502), and the first insert column (1501) is slidably connected to the inner wall of the outer insert (16). The first flange plate (1502) is arranged at the lower end of the first insert column (1501), the outer insert (16) is composed of a second insert column (1601) and a second flange plate (1602), the second insert column (1601) is slidably connected to the inner wall of the convex module (5), the second flange plate (1602) is arranged at the lower end of the second insert column (1601), the first flange plate (1502) and the second flange plate (1602) are both located inside the avoidance hole (401), a first linkage structure is arranged between the second flange plate (1602) and the movable plate (11), and a second linkage structure is arranged between the first flange plate (1502) and the second flange plate (1602); The inner insert (15) is provided with a glue injection hole (19) which is communicated with the lower wall of the inner insert (15); the high-pressure connecting pipe (12) is communicated with the inside of the glue injection hole (19); the upper side wall of the inner insert (15) is provided with a first injection hole (20) which is communicated with the inside of the glue injection hole (19); and the outer wall of one end of the outer insert (16) extending to the upper side of the male module (5) is provided with a second injection hole (22) which is communicated with the inside and the outside; The inner wall of the outer insert (16) is provided with a matching hole (21) which is through-through from top to bottom, and the inner wall of the matching hole (21) is provided with two groups of first wear-resistant rings (23) in sequence in an upper and lower distribution, and the inner walls of the two groups of first wear-resistant rings (23) are both slidably connected to the circumferential outer wall of the first insert column (1501), and the inner wall of the matching hole (21) and located above the two groups of first wear-resistant rings (23) are provided with a first sealing member (24) and a second sealing member (25) in sequence from bottom to top; The end of the first insert column (1501) away from the first flange plate (1502) is provided with a conical surface, the end of the first injection hole (20) away from the injection hole (19) is connected to the conical surface, the upper opening of the matching hole (21) is provided with a conical opening matched with the conical surface of the first insert column (1501), the end of the second injection hole (22) facing the axis of the second insert column (1601) is connected to the inside of the conical opening and the horizontal height of the second injection hole (22) is located below the second sealing member (25), the circumferential outer wall of the first insert column (1501) and the inner wall of the matching hole (21) are sealed by the first sealing member (24), and the conical surface of the first insert column (1501) is sealed by the second sealing member (25) when it is matched with the conical opening of the matching hole (21); The first linkage structure comprises a plurality of groups of first push rods (17) and second push rods (18), the plurality of groups of the first push rods (17) are fixedly connected to the lower wall of the second flange plate (1602) and are located at the periphery of the first flange plate (1502), the ends of the plurality of first push rods (17) away from the second flange plate (1602) penetrate the upper wall of the pad plate (3) and extend into the movable groove (301), the ends of the plurality of first push rods (17) extending into the movable groove (301) are fixedly connected to the upper wall of the movable plate (11), and after the lower wall of the movable plate (11) abuts against the upper wall of the lower die seat (2), the upper wall of the second insert column (1601) abuts against the convex The upper wall of the module (5) is flush, and multiple groups of the second push rods (18) are fixedly connected to the lower wall of the first flange plate (1502). The ends of the multiple groups of the second push rods (18) away from the first flange plate (1502) successively penetrate the inner wall of the pad (3) and the inner wall of the movable plate (11) and extend to the lower side of the movable plate (11). The upper wall of the lower mold base (2) and the upper and lower opposite positions of the multiple groups of the second push rods (18) are fixedly connected with anti-wear blocks (13). The vertical distance between the lower end of the second push rod (18) and the lower wall of the movable plate (11) is consistent with the vertical distance between the upper wall of the first insert column (1501) and the upper wall of the second insert column (1601); The second linkage structure comprises a spring (32), a hanging pin (29) and an anti-slip head (30); the upper wall of the first flange plate (1502) is provided with a mounting hole (31); the spring (32) is arranged on the inner wall of the mounting hole (31); the upper end of the spring (32) abuts against the lower wall of the second flange plate (1602); the inner wall of the first flange plate (1502) is provided with a step hole (28) located outside the mounting hole (31); the hanging pin (29) is fixedly connected to the lower wall of the second flange plate (1602) and abuts against the step hole ( The first flange plate (1502) and the second flange plate (1602) are opposed to each other in upper and lower parts, the end of the hanging pin (29) away from the second flange plate (1602) passes through the inner wall of the first flange plate (1502) and extends into the step hole (28), the anti-slip head (30) is arranged at the end of the hanging pin (29) extending into the step hole (28), the first flange plate (1502) and the second flange plate (1602) are kept separated by a spring (32), and the first flange plate (1502) is connected to the second flange plate (1602) via the hanging pin (29) and the anti-slip head (30).

2. A composite material transfer molding die according to claim 1, characterized in that: The inner wall of the convex module (5) is provided with an insert hole (14) which passes through from top to bottom. The inner wall of the insert hole (14) is provided with two groups of second wear-resistant rings (26) which are arranged in sequence in an upper and lower distribution. The inner walls of the two groups of second wear-resistant rings (26) are both slidably connected to the circumferential outer wall of the second insert column (1601). A third sealing member (27) is provided on the inner wall of the insert hole (14) and above the two groups of second wear-resistant rings (26). The insert hole (14) and the second insert column (1601) are sealed by the third sealing member (27).

3. A composite material transfer molding die according to claim 2, characterized in that: The lifting drive structure comprises a cylinder (10) and a top plate (9); the upper wall of the lower die base (2) and the left and right sides of the movable plate (11) are fixedly connected with cushion blocks (7); the upper walls of the two groups of cushion blocks (7) are fixedly connected with a group of support plates (8); the top plate (9) is fixedly connected to the upper ends of the two groups of support plates (8); the cylinder (10) is fixedly connected to the lower wall of the top plate (9) and is located between the two groups of support plates (8); and the end of the cylinder (10) extending out of the shaft is fixedly connected to one end of the movable plate (11) extending out to the outside of the cushion plate (3).

4. The method for forming a composite material transfer molding die according to claim 3, characterized in that: The molding method comprises the following steps: S1. Apply a mold release agent on the opposite sides of the male module (5) and the female module, lay a portion of the fiber reinforcement on the upper wall of the male module (5) and lay the other portion inside the female module, place the metal plate (1) on the upper wall of the male module (5), and position and support the metal plate by inserting the positioning groove (101) into the second insert column (1601) to protrude one end of the upper wall of the male module (5); S2, closing the mold, closing the upper mold part and the lower mold part, and locking them, the lower mold plate (4) and the concave mold block are sealed by a sealing strip, the electric control reversing valve is switched to connect the exhaust device to the high-pressure connecting pipe (12), and the exhaust device sucks away the air near the metal plate (1) through the high-pressure connecting pipe (12), the glue injection hole (19), the first injection hole (20) and the second injection hole (22); S3, glue injection, heating the mold to the resin melting temperature in an oven, switching to the resin pressure injection device connected to the high-pressure connecting pipe (12) through an electric control reversing valve, and injecting the heated and melted resin into the space between the male module (5) and the female module through the high-pressure connecting pipe (12), the glue injection hole (19), the first injection hole (20) and the second injection hole (22) to infiltrate the fiber reinforcement to form a composite material and wrap the metal plate (1). After reaching the specified injection amount, cooling for twenty minutes for pre-curing; S4, core pulling, after pre-curing is completed, the cylinder (10) extends the shaft to drive the movable plate (11) to move downward, and during the downward movement of the movable plate (11), the outer insert (16) is driven to move downward synchronously through multiple sets of first push rods (17), and the outer insert (16) drives the inner insert (15) to move downward synchronously, and the second injection hole (22) is shielded by the side wall of the insert hole (14). While the movable plate (11) moves downward, the resin pressure injection device continues to meter the heated and melted resin and move it downward toward the outer insert (16) and the inner insert (15) through the high-pressure connecting pipe (12), the injection hole (19), and the first injection hole (20). The resin is injected into the cavity that appears after the inner insert (15) and the outer insert (16) move downward after the multiple sets of second push rods (18) on the lower wall of the inner insert (15) come into contact with the anti-wear block (13), and the movable plate (11) and the outer insert (16) continue to move downward. The cylinder (10) extends the shaft and pushes the movable plate (11) until the lower wall of the movable plate (11) abuts against the upper wall of the lower mold base (2). At this time, the cavity that appears after the inner insert (15) and the outer insert (16) move downward is filled with resin that enters the cavity from between the cone surface and the cone head. At the same time, the upper end of the inner insert (15) and the upper end of the outer insert (16) are flush with the upper wall of the convex module (5), and pressure begins to be applied between the upper mold part and the lower mold part; S5. After the core pulling is completed, the mold is pushed back into the oven for heating and cooled to room temperature again. The finished product is taken out after the mold is opened.

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