Composite material compression molding device and molding method

Abstract

The invention provides a composite material compression molding device and a molding method, and relates to the technical field of hot press molding. The composite material compression molding device comprises a pre-pressing mold, an upper mold, a lower mold and an air supply device. According to the mold, the fixed insert, the movable insert and the upper wall of the lower mold plate jointly form a lower molding surface, a composite material product is separated from the lower molding surface through air pressure during stripping, surface defects of the product cannot be caused, and the product quality is effectively improved; meanwhile, the axial position is locked through the locking structure, the problem that the product locally protrudes due to the fact that the movable insert retreats when pressed is effectively solved, compressed air meeting the stripping pressure is filled into the air storage cavity in advance, the air supply device does not supply air any more during air blowing and stripping, and the production efficiency is improved. And the problem of energy waste caused by blowing of the air supply device after stripping of the product is completed can be avoided, and energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of hot pressing molding, in particular to a composite material compression molding device and a molding method. Background Art

[0002] Composite materials, such as carbon fiber reinforced resin-based composite materials (CFRP), have higher specific stiffness and strength than aluminum alloy materials. According to statistics, using CFRP to replace aluminum alloy structures in load-bearing structures is expected to achieve a weight reduction of more than 30%. Compression molding (press molding) is the oldest and most dynamic molding method in composite material production. It is a method of adding a certain amount of premix or prepreg into a mold, and curing and molding by heating and pressurizing. For example, a compression molding device for manufacturing a composite frame structure, a composite frame structure and a manufacturing method thereof are proposed in the disclosed technology. The device comprises a forming mold, and the forming mold comprises a lower mold and an upper mold; the lower mold comprises a lower mold plate, a side mold plate and a mold cavity surrounded by the lower mold plate and the side mold plate, and a plurality of protrusions integrally formed on the lower mold plate are arranged in the mold cavity, and the lower mold, the upper mold and the plurality of protrusions cooperate with each other so that the shape of the mold cavity matches the shape of the composite material frame structure to be manufactured; the disclosed technology can ensure that the density of each part of the composite material frame structure is uniform, which is conducive to improving the quality of the product; however, in the disclosed technology, when demolding after the molding is completed, the product is ejected by multiple demolding ejector pins. Although it is proposed to use a demolding plate to synchronously drive the movement of multiple demolding ejector pins so that the product is subjected to uniform force during the demolding process and reduce irreversible damage to the product during the demolding process, in the actual demolding process, top marks will still appear at the contact position between the demolding ejector pin and the product, and even pits will appear in severe cases; In order to solve the above problems, there are also improved technologies on the market that propose a pneumatic demoulding device for composite material compression molding, including a mold body, a blowing hole is arranged in the mold body, a blowing control component is arranged in the blowing hole and is connected to an air source; an adsorption component is arranged opposite to the molding surface; a pulling component is connected to the adsorption component; there are multiple adsorption components, and the multiple adsorption components are used to adsorb the molded part with multiple adsorption points, and the blowing hole is used to blow the molded part with a core blowing point; the multiple adsorption points are distributed at intervals around the core blowing point, so that the multiple adsorption points and the core blowing point together form multiple demoulding force points on the molded part that are conducive to uniform force on the molded part, while reducing the number of blowing holes and facilitating the subsequent trimming of the molded part, it is conducive to uniform force on the molded part during demoulding, and it is conducive to forming a rapidly expanding gap between the molded part and the mold body, so as to achieve the purpose of facilitating demoulding; However, in the above-mentioned improved technology, the multiple blowing holes are all through-shaped, which will inevitably cause the product to have bulges at the positions corresponding to the blowing holes during compression molding, resulting in the product not being compacted at that position. Although it is proposed to use fewer blowing holes to improve this defect, it is difficult to achieve the demoulding effect if the number is too small, and the defect of local bulges in the product is inevitable; In summary, it is necessary to improve the structure of the composite material compression molding device and molding method to solve the problems in the prior art of product damage and protrusion defects on the product during demolding of composite material compression molding. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a composite material compression molding device and a molding method, which solve the problems in the prior art of composite material compression molding devices and molding methods that products are easily damaged and have convex defects on the products.

[0004] To achieve the above objectives, the present invention is implemented through the following technical scheme: a composite material compression molding device, including a pre-compression mold, an upper mold, a lower mold and an air supply device, the upper mold includes an upper mold base, the lower wall of the upper mold base is fixedly connected to the upper mold base, the lower mold includes a lower mold base, the upper wall of the lower mold base is fixedly connected to a pad plate and a lower mold base in sequence from bottom to top, the side of the lower mold base away from the pad plate abuts against the side of the upper mold base away from the upper mold base, the lower mold base is respectively provided with a lower molding surface and an upper molding surface on the side opposite to the upper mold base, a stripping component for convenient stripping after molding is provided inside the lower mold, the stripping component includes a connecting seat, a fixed insert, a movable insert, a sliding seat, a sliding rod, a connecting rod and a ejecting plate, an installation cavity is provided inside the lower mold base and is communicated with the lower wall of the lower mold base, the connecting seat, the movable insert, the sliding seat and the sliding rod are all arranged inside the installation cavity, the lower wall of the lower mold base is provided with a sink groove, and the ejecting plate is slidably connected to the inner side wall of the sink groove.

[0005] Preferably, the connecting seat is fixedly connected to the upper wall inside the installation cavity, an air storage cavity is arranged inside the connecting seat, the sliding seat is fixedly connected to the lower wall of the connecting seat, the fixed insert is arranged on the upper wall of the connecting seat, the outer wall of the fixed insert passes through the inner wall of the lower template, the inner wall of the fixed insert is provided with a matching hole which passes through from top to bottom, the movable insert is slidably connected to the inner wall of the matching hole, the end of the fixed insert away from the connecting seat and the upper end of the movable insert are both flush with the lower forming surface of the lower template, the sliding rod is fixedly connected to the lower end of the movable insert, the upper end of the sliding rod is provided with a rectangular hole, the lower end of the movable insert is provided with a rectangular connecting block, the outer wall of the rectangular connecting block is adapted to the inner cavity of the rectangular hole, and the sliding rod and the movable insert are connected by a rectangular connecting block The cam is secured to the bottom of the slide block by a screw bolt and the end of the slide block is secured to the bottom of the slide block and is in a state of being moved upwards and downwards.

[0006] Preferably, an air inlet connector is fixedly connected to the side wall of the connecting seat, and the air inlet connector is communicated with the interior of the air storage chamber. The end of the air inlet connector away from the connecting seat is connected to the air supply device through an air pipe. A pressure sensor is fixedly connected to the front wall of the connecting seat, and the detection end of the pressure sensor passes through the front wall of the connecting seat and extends into the interior of the air storage chamber.

[0007] Preferably, the locking structure includes an annular groove, a magnetic powder bag and an electromagnetic coil, the sliding rod is located between the sliding seat and the connecting rod and penetrates the interior of the shell, the annular groove is arranged on the outer wall of the sliding rod and is located inside the shell, the electromagnetic coil is arranged on the inner wall of the shell, the magnetic powder bag is arranged on the inner wall of the shell and is located between the electromagnetic coil and the sliding rod, the magnetic powder bag is composed of multiple groups of magnetic powder, and a second sealing ring and a third sealing ring are respectively arranged on the inner wall of the shell near the upper and lower ends, and the inner walls of the second sealing ring and the third sealing ring are both slidably connected to the outer wall of the sliding rod.

[0008] Preferably, the driving structure includes two groups of cylinders, the upper wall of the lower die base is fixedly connected with two groups of top plates through four groups of support plates, the two groups of top plates are respectively arranged on the front and rear sides of the pad, the two groups of cylinders are respectively fixedly connected to the lower walls of the two groups of top plates, the two groups of cylinder extension shafts both penetrate the inner wall of the lower die base and extend into the interior of the trough, and one end of the cylinder extension shaft extending into the interior of the trough is fixedly connected to the upper wall of the top plate.

[0009] Preferably, the guide structure includes four groups of guide seats, which are all fixedly connected to the upper wall of the lower mold base and are located in pairs on the front and rear sides of the pad respectively. The inner wall of the guide seat is slidably connected with a guide column, and the lower end of the guide column passes through the inner wall of the lower mold base and extends into the interior of the sink. The end of the guide column extending into the sink is fixedly connected to the upper wall of the top plate.

[0010] Preferably, the movable insert has a frustum-shaped shape and the upper end diameter is smaller than the lower end diameter, the lower end diameter of the movable insert is consistent with the outer diameter of the sliding rod, the inner cavity shape of the matching hole is adapted to the shape of the movable insert, and a plurality of first sealing rings are sequentially arranged on the circumferential outer wall of the movable insert from top to bottom.

[0011] Preferably, the sliding rod and the sliding seat are sealed by a fifth sealing ring, and the sliding seat and the connecting seat are sealed by a fourth sealing ring.

[0012] Preferably, the connecting rod has a square cross-section, and fixing holes matching the connecting rod are provided on the upper wall of the ejector plate at positions opposite to the connecting rod above and below. The connecting rod and the ejector plate are fixed by screws after the connecting rod is inserted into the fixing hole.

[0013] According to the above-mentioned molding method of a composite material compression molding device, the molding method comprises the following steps: S1, filling a composite material prepreg containing fibers and resin into a pre-pressing mold for pre-pressing to obtain a composite material preform; S2, placing the composite material preform between the upper template and the lower template, and after the upper template and the lower template are pressurized and heated by the equipment, the composite material preform is cured and formed to obtain a composite material finished product. During the curing process, the movable insert is fixed in the axial position by a locking structure, and the upper end surfaces of the movable insert and the fixed insert are kept together with the upper side of the lower template to form a lower molding surface. While curing and forming, the air supply device injects compressed air into the air storage cavity, and the pressurization condition is detected by a pressure sensor; S3. After the equipment drives the upper template to separate from the lower template, the electromagnetic coil in the locking structure is powered off, the magnetic powder in the magnetic powder bag loses its magnetism and pulverizes, the axial locking state of the sliding rod is released, the cylinder extends the shaft, drives the ejector plate to move downward, and the ejector plate drives the movable insert to move downward through the connecting rod and the sliding rod. After the movable insert moves downward, a gap is formed between the movable insert and the matching hole, and the pressurized air in the air storage cavity is blown out from the gap to separate the cured composite product from the lower molding surface of the lower template, and then the finished product is taken out manually or by a robot; S4. After the finished composite material is taken out, the cylinder extends and retracts its shaft, driving the ejector plate to move upward. During the process of the ejector plate moving upward, the movable insert is driven upward by the connecting rod and the sliding rod until the outer wall of the movable insert is completely fitted with the inner wall of the matching hole. After the movable insert is fitted with the matching hole, the sealing state inside the air storage cavity is achieved through multiple sets of first sealing rings, fourth sealing rings and fifth sealing rings. S5. After the movable insert is fitted with the matching hole, the electromagnetic coil is energized to generate magnetism, so that the magnetic powder in the magnetic powder bag is solidified by magnetism, the axial position of the sliding rod is locked, and the air intake device injects compressed air into the air storage chamber again, and the above steps are repeated.

[0014] The present invention provides a composite material compression molding device and molding method, which have the following beneficial effects: Compared with the prior art, in the composite material compression molding device and molding method, when the composite material product is pressurized and cured, the fixed insert, the movable insert and the upper wall of the lower template together form the lower molding surface, so that no surface defects will appear at the position where the product contacts the fixed insert and the movable insert. When stripping, the movable insert moves downward to form a gap between the movable insert and the inner wall of the matching hole, and the pressurized air in the air storage cavity is blown out from the gap, and the composite material product is separated from the lower molding surface of the lower template by air pressure to achieve stripping. Stripping by air capping will also not cause product surface defects, effectively improving product quality.

[0015] Compared with the prior art, in the composite material compression molding device and molding method, during the compression curing molding process of the composite product, the movable insert is fixed by pulling the extended shaft of the cylinder, and the axial position is locked by the locking structure, which effectively avoids the problem of local bulge of the product caused by the retreat of the movable insert when under pressure.

[0016] Compared with the prior art, the composite material compression molding device and molding method can obtain the air pressure required to drive the product to be stripped through simple calculations and tests, and the compressed air that meets the stripping pressure is filled into the air storage cavity in advance, and the pressure value is monitored by the pressure sensor. When blowing to strip the material, the air supply device no longer supplies air, which can avoid the problem of energy waste caused by the air supply device still blowing air after the product has been stripped, and is more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A; Figure 3 It is a schematic diagram of the internal cross-section of the overall structure of the present invention; Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle; Figure 5 For the present invention Figure 3 A partial enlarged view of point C in the middle; Figure 6 It is a partial cross-sectional schematic diagram of the connection structure of the connecting rod and the ejector plate of the present invention; Figure 7 It is a partial cross-sectional schematic diagram of the connection structure of the connection seat, the fixed insert, the movable insert, the sliding rod, the sliding seat and the housing of the present invention; Figure 8 For the present invention Figure 7 A partial enlarged view of point D in the middle; Fig. 9 It is a cross-sectional schematic diagram of the internal structure of the connecting seat and the fixed insert of the present invention; Fig.10 It is a schematic diagram of the structure of the movable insert and the rectangular connecting block of the present invention; Fig.11 It is a partial schematic diagram of the sliding rod and rectangular hole structure of the present invention.

[0018] Among them, 1. upper die seat; 2. lower die seat; 201, sink groove; 3. upper template; 4. pad; 5. lower template; 6. guide seat; 7. guide column; 8. support plate; 9. top plate; 10. cylinder; 11. ejector plate; 12. installation cavity; 13. connecting seat; 1301, air storage cavity; 14. fixed insert; 1401, matching hole; 15. sliding seat; 16. shell; 17. sliding rod; 1701, ring groove; 1702, rectangular hole; 18. connecting rod; 19, air intake connector; 20. pressure sensor; 21. movable insert; 2101, rectangular connecting block; 22, first sealing ring; 23. second sealing ring; 24. third sealing ring; 25. electromagnetic coil; 26. magnetic powder bag; 27. fourth sealing ring; 28. fifth sealing ring. DETAILED DESCRIPTION

[0019] 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. Example

[0020] like Figures 1 to 11As shown, an embodiment of the present invention provides a composite material compression molding device, including a pre-compression mold, an upper mold, a lower mold and an air supply device, the upper mold includes an upper mold base 1, the lower wall of the upper mold base 1 is fixedly connected to an upper mold plate 3, the lower mold includes a lower mold base 2, the upper wall of the lower mold base 2 is fixedly connected to a pad 4 and a lower mold plate 5 in sequence from bottom to top, the side of the lower mold plate 5 away from the pad 4 is abutted against the side of the upper mold plate 3 away from the upper mold base 1, the side of the lower mold plate 5 opposite to the upper mold plate 3 is respectively provided with a lower molding surface and an upper molding surface, a stripping component for convenient stripping after molding is provided inside the lower mold, the stripping component includes a connecting seat 13, a fixed insert 14, a movable insert 21, a sliding seat 15, a sliding rod 17, a connecting rod 18 and a top plate 11, the lower mold plate 5 is provided with an installation cavity 12 that penetrates the lower wall of the lower mold plate 5, the connecting seat 13 , the movable insert 21, the sliding seat 15 and the sliding rod 17 are all arranged inside the installation cavity 12, the lower wall of the lower mold base 2 is provided with a sink 201, and the ejector plate 11 is slidably connected to the inner wall of the sink 201. In this embodiment, the air supply device, the pre-compression mold, the lower molding surface and the upper molding surface are all consistent with the existing technical structure, and the upper mold and the lower mold are driven to open and close the mold and pressurize through the existing compression molding equipment. The air supply device can be a compressor with an air storage tank and an oil-water separator. This embodiment specifically improves the stripping structure and process between the composite material product and the lower molding surface after pressure curing molding. The lower molding surface can be a convex surface or a concave surface, which is specifically determined by whether it stays on the convex surface or the concave surface when the mold is opened after the product is formed. The stripping assembly proposed in this embodiment is used in the production of products that can be vertically stripped.

[0021] In order to inject compressed air into the air storage chamber 1301 in advance, the connecting seat 13 is fixedly connected to the inner upper wall of the installation chamber 12, and the air storage chamber 1301 is arranged inside the connecting seat 13. The side wall of the connecting seat 13 is fixedly connected to an air inlet connector 19, and the air inlet connector 19 is connected to the inside of the air storage chamber 1301. The end of the air inlet connector 19 away from the connecting seat 13 is connected to the air supply device through an air pipe. The front wall of the connecting seat 13 is fixedly connected to a pressure sensor 20, and the detection end of the pressure sensor 20 passes through the front wall of the connecting seat 13 and extends into the air storage chamber 1301. The blowing pressure value required for product stripping can be obtained through simple testing and calculation. Under the monitoring of the pressure sensor 20, compressed air with a pressure value slightly greater than the stripping pressure is injected into the air storage chamber 1301 in advance, so that the amount of compressed air used for each stripping can be controlled, which can meet the stripping needs without wasting. In order to realize the material removal, the movable insert 21 has a truncated cone shape and the upper end diameter is smaller than the lower end diameter. The lower end diameter of the movable insert 21 is consistent with the outer diameter of the sliding rod 17. The inner cavity shape of the matching hole 1401 is adapted to the shape of the movable insert 21. The outer wall of the circumference of the movable insert 21 is provided with multiple groups of first sealing rings 22 from top to bottom. The sliding rod 17 and the sliding seat 15 are sealed by the fifth sealing ring 28. The sliding seat 15 and the connecting seat 13 are sealed by the fourth sealing ring 27. The compressed air in the air storage cavity 1301 is blown out from the gap formed between the movable insert 21 and the matching hole 1401 when the movable insert 21 moves downward, and the product is lifted up by air pressure and separated from the lower molding surface, and no surface defects such as top marks will appear at the lifting position. In order to prevent defects on the surface of the composite product during solidification, the sliding seat 15 is fixedly connected to the lower wall of the connecting seat 13, the fixed insert 14 is arranged on the upper wall of the connecting seat 13, the outer wall of the fixed insert 14 passes through the inner wall of the lower template 5, the inner wall of the fixed insert 14 is provided with a matching hole 1401 which passes through from top to bottom, the movable insert 21 is slidably connected to the inner wall of the matching hole 1401, the end of the fixed insert 14 away from the connecting seat 13 and the upper end of the movable insert 21 are both flush with the lower molding surface of the lower template 5, when the movable insert 21 is completely pressed against the inner wall of the matching hole 1401, the upper end surface of the movable insert 21, the upper end surface of the fixed insert 14 and the upper surface of the lower template 5 jointly form the lower molding surface, when the lower mold is processed and produced, the movable insert 21, the fixed insert 14 and the upper surface of the lower template 5 are polished and matched at the same time, so that the produced product will not have quality defects such as bulges and depressions at the movable insert 21 and the fixed insert 14; In order to prevent the movable insert 21 from rotating in the circumferential direction and affecting the integrity of the lower molding surface, the sliding rod 17 is fixedly connected to the lower end of the movable insert 21, and a rectangular hole 1702 is provided at the upper end of the sliding rod 17, and a rectangular connecting block 2101 is provided at the lower end of the movable insert 21. The outer wall of the rectangular connecting block 2101 is adapted to the inner cavity of the rectangular hole 1702. The sliding rod 17 and the movable insert 21 are inserted into the rectangular hole 1702 by the rectangular connecting block 2101 and then fixed by screws. Through the cooperation of the rectangular connecting block 2101 and the rectangular hole 1702, the movable insert 21 and the sliding rod 17 will not be displaced in the axial and circumferential directions, thereby ensuring the integrity of the lower molding surface each time it is used. The end of the sliding rod 17 away from the sliding rod 17 passes through the inner wall of the lower die seat 21 and is slidably connected thereto. The end of the sliding rod 17 extending below the sliding seat 15 is fixedly connected to a connecting rod 18. The end of the connecting rod 18 away from the sliding rod 17 successively passes through the inner wall of the pad 4 and the inner wall of the lower die seat 2 and extends into the interior of the sink 201. The end of the connecting rod 18 extending into the interior of the sink 201 is fixedly connected to the upper wall of the ejector plate 11. The connecting rod 18 has a square cross-section. A fixing hole matching the connecting rod 18 is provided on the upper wall of the ejector plate 11 and at positions opposite to the connecting rod 18 above and below. The connecting rod 18 and the ejector plate 11 are fixed by screws after the connecting rod 18 is inserted into the fixing hole. After the connecting rod 18 and the sliding rod 17 are fixed, the end of the connecting rod 18 away from the sliding rod 17 is fixed by the ejector plate 11, so that the sliding rod 17 does not rotate circumferentially, thereby maintaining the position accuracy of the movable insert 21 in the circumferential direction. In order to prevent the movable insert 21 from retreating due to pressure when under pressure, the lower end of the sliding seat 15 is fixedly connected to the shell 16, and a locking structure for locking the axial position of the sliding rod 17 is arranged between the inside of the shell 16 and the sliding rod 17. The locking structure includes an annular groove 1701, a magnetic powder bag 26 and an electromagnetic coil 25. The sliding rod 17 is located between the sliding seat 15 and the connecting rod 18 and penetrates the inside of the shell 16. The annular groove 1701 is arranged on the outer wall of the sliding rod 17 and is located inside the shell 16. The electromagnetic coil 25 is arranged on the inner side wall of the shell 16. The magnetic powder bag 26 is arranged on the inner side wall of the shell 16 and is located at the electromagnetic coil Between the ring 25 and the sliding rod 17, the magnetic powder bag 26 is composed of multiple groups of magnetic powders. The inner wall of the shell 16 and near the upper and lower ends are respectively provided with a second sealing ring 23 and a third sealing ring 24. The inner walls of the second sealing ring 23 and the third sealing ring 24 are both slidably connected with the outer wall of the sliding rod 17. The electromagnetic coil 25 is energized to generate magnetism and demagnetized when it is deenergized. When the electromagnetic coil 25 is energized to generate magnetism, the magnetic powder in the magnetic powder bag 26 is magnetized and solidified. The magnetic powder inside the shell 16 cooperates with the magnetic powder filled in the annular groove 1701 to form a whole, so that the sliding rod 17 cannot move axially, and the movable insert 21 is kept from yielding when under pressure. In order to realize the closing and separation of the movable insert 21 and the matching hole 1401, a driving structure for driving the ejection plate 11 to move up and down is arranged between the lower die base 2 and the ejection plate 11, and the driving structure includes two groups of cylinders 10. The upper wall of the lower die base 2 is fixedly connected with two groups of ejection plates 9 through four groups of support plates 8. The two groups of ejection plates 9 are respectively arranged on the front and rear sides of the pad 4, and the two groups of cylinders 10 are respectively fixedly connected to the lower walls of the two groups of ejection plates 9. The extended shafts of the two groups of cylinders 10 all penetrate the inner wall of the lower die base 2 and extend into the interior of the sink 201. The end of the extended shaft of the cylinder 10 extending into the interior of the sink 201 is fixedly connected to the upper wall of the ejection plate 11. A guide structure for maintaining stability when the ejection plate 11 moves up and down is arranged between the ejection plate 11 and the lower die base 2. The guide structure includes four groups of guide seats 6. The four groups of guide seats 6 are all fixedly connected to the upper wall of the lower die base 2 and are arranged in pairs of two and are respectively located on the pad On the front and rear sides of the plate 4, the inner wall of the guide seat 6 is slidably connected with a guide column 7, the lower end of the guide column 7 passes through the inner wall of the lower mold seat 2 and extends into the interior of the sink 201, and one end of the guide column 7 extending into the interior of the sink 201 is fixedly connected to the upper wall of the ejection plate 11, and the cylinder 10 extends the shaft to drive the ejection plate 11 to move downward. During the downward movement of the ejection plate 11, the movable insert 21 is driven downward by the connecting rod 18 and the sliding rod 17, and then a gap for blowing is formed between the movable insert 21 and the matching hole 1401. When the cylinder 10 extends the shaft and retracts, it drives the ejection plate 11 to move upward, and then the movable insert 21 is driven by the connecting rod 18 and the sliding rod 17 to be tightly pressed against the inner wall of the matching hole 1401 again, and the sealing of the connection is achieved by the first sealing ring 22. During the upward and downward movement of the ejection plate 11, it is guided by the guide column 7 and the guide seat 6 to maintain the stability of movement.

[0022] According to the above-mentioned molding method of a composite material compression molding device, the molding method comprises the following steps: S1, filling a composite material prepreg containing fibers and resin into a pre-pressing mold for pre-pressing to obtain a composite material preform; S2, placing the composite material preform between the upper template 3 and the lower template 5, and after the upper template 3 and the lower template 5 are pressurized and heated by the equipment, the composite material preform is cured and formed to obtain a composite material finished product. During the curing process, the movable insert 21 is fixed in the axial position by a locking structure, and the upper end surface of the movable insert 21 and the fixed insert 14 and the upper side of the lower template 5 are kept to form a lower molding surface together. While curing and forming, the air supply device injects compressed air into the air storage cavity 1301, and the pressurization condition is detected by the pressure sensor 20; S3, after the equipment drives the upper mold plate 3 to separate from the lower mold plate 5, the electromagnetic coil 25 in the locking structure is powered off, the magnetic powder in the magnetic powder bag 26 loses its magnetism and pulverizes, the axial locking state of the sliding rod 17 is released, the cylinder 10 extends its shaft, drives the ejector plate 11 to move downward, and the ejector plate 11 drives the movable insert 21 to move downward through the connecting rod 18 and the sliding rod 17. After the movable insert 21 moves downward, a gap is formed between the movable insert 21 and the matching hole 1401, and the pressurized air in the air storage chamber 1301 is blown out from the gap, separating the cured composite product from the lower molding surface of the lower mold plate 5, and then the finished product is taken out manually or by a robot; S4. After the finished composite material product is taken out, the cylinder 10 extends and retracts its shaft, driving the ejector plate 11 to move upward. During the upward movement of the ejector plate 11, the movable insert 21 is driven upward by the connecting rod 18 and the sliding rod 17 until the outer wall of the movable insert 21 is completely fitted with the inner wall of the matching hole 1401. After the movable insert 21 is fitted with the matching hole 1401, the sealing state inside the air storage chamber 1301 is achieved through multiple sets of first sealing rings 22, fourth sealing rings 27 and fifth sealing rings 28. S5. After the movable insert 21 is fitted with the matching hole 1401, the electromagnetic coil 25 is energized to generate magnetism, so that the magnetic powder in the magnetic powder bag 26 is solidified by magnetism, and the axial position of the sliding rod 17 is locked. The air intake device injects compressed air into the air storage chamber 1301 again, and the above steps are repeated.

[0023] Working principle: In this embodiment, the air supply device, pre-compression mold, lower molding surface and upper molding surface are all consistent with the existing technical structure. The upper and lower molds are driven to open and close the molds and pressurize through the existing compression molding equipment. The air supply device can be a compressor with an air storage tank and an oil-water separator. This embodiment specifically improves the stripping structure and process between the composite material product and the lower molding surface after pressure curing molding. The lower molding surface can be a convex surface or a concave surface, which is determined by whether the product remains on the convex surface or the concave surface when the mold is opened after molding. The stripping assembly proposed in this embodiment is used in the production of products that can be stripped vertically; the blowing pressure required for product stripping The value can be obtained through simple tests and calculations. Under the monitoring of the pressure sensor 20, compressed air with a pressure value slightly greater than the stripping pressure is injected into the air storage chamber 1301 in advance, so that the amount of compressed air used for each stripping can be controlled, which can meet the stripping needs without wasting it. The compressed air in the air storage chamber 1301 is blown out from the gap formed between the movable insert 21 and the matching hole 1401 when the movable insert 21 moves downward, and the product is lifted up and separated from the lower molding surface by air pressure, and no surface defects such as top marks will appear at the lifting position. The end of the fixed insert 14 away from the connecting seat 13 and the upper end of the movable insert 21 are flush with the lower molding surface of the lower template 5, and the movable insert 21 is flush with the lower molding surface of the lower template 5. When the movable insert 21 is completely pressed against the inner wall of the matching hole 1401, the upper end surface of the movable insert 21, the upper end surface of the fixed insert 14 and the upper surface of the lower template 5 jointly form a lower molding surface. When the lower mold is processed and produced, the movable insert 21, the fixed insert 14 and the upper surface of the lower template 5 are polished and matched at the same time, so that the produced product will not have quality defects such as bulges and depressions at the movable insert 21 and the fixed insert 14; the sliding rod 17 and the movable insert 21 are inserted into the rectangular hole 1702 through the rectangular connecting block 2101 and then fixed by screws. Through the cooperation of the rectangular connecting block 2101 and the rectangular hole 1702, the movable insert 21 and the sliding rod 17 are connected. No axial and circumferential displacement will occur between the connecting rod 18 and the sliding rod 17, ensuring the integrity of the lower molding surface each time it is used; after the connecting rod 18 is fixed to the sliding rod 17, the end of the connecting rod 18 away from the sliding rod 17 is fixed by the ejector plate 11, so that the sliding rod 17 will not rotate circumferentially, thereby maintaining the position accuracy of the movable insert 21 in the circumferential direction; the electromagnetic coil 25 is energized to generate magnetism and de-energized to lose magnetism. When the electromagnetic coil 25 is energized to generate magnetism, the magnetic powder in the magnetic powder bag 26 is magnetized and solidified, and the magnetic powder inside the housing 16 cooperates with the magnetic powder filled in the annular groove 1701 to form a whole, so that the sliding rod 17 cannot move axially, and the movable insert 21 is kept from yielding when under pressure;The cylinder 10 extends its shaft, which can drive the ejector plate 11 to move downward. During the downward movement of the ejector plate 11, the movable insert 21 is driven downward by the connecting rod 18 and the sliding rod 17, thereby forming a gap for blowing between the movable insert 21 and the matching hole 1401. When the cylinder 10 extends its shaft and retracts, it drives the ejector plate 11 to move upward, thereby driving the movable insert 21 to press against the inner wall of the matching hole 1401 again through the connecting rod 18 and the sliding rod 17, and the sealing of the connection is achieved through the first sealing ring 22. During the upward and downward movement of the ejector plate 11, it is guided by the guide column 7 and the guide seat 6 to maintain the stability of movement. ;

[0024] 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 compression molding device, characterized in that: The invention comprises a pre-pressing die, an upper die, a lower die and an air supply device, wherein the upper die comprises an upper die base (1), the lower wall of the upper die base (1) being fixedly connected to an upper die plate (3), the lower die comprises a lower die base (2), the upper wall of the lower die base (2) being fixedly connected to a backing plate (4) and a lower die plate (5) in sequence from bottom to top, the side of the lower die plate (5) away from the backing plate (4) being in contact with the side of the upper die plate (3) away from the upper die base (1), the side of the lower die plate (5) opposite to the upper die plate (3) being respectively provided with a lower molding surface and an upper molding surface, and a stripping assembly for facilitating stripping of the material after molding is provided inside the lower die. The stripping assembly comprises a connecting seat (13), a fixed insert (14), a movable insert (21), a sliding seat (15), a sliding rod (17), a connecting rod (18) and a ejecting plate (11); a mounting cavity (12) which is in communication with a lower wall of the lower mold plate (5) is arranged inside the lower mold plate (5); the connecting seat (13), the movable insert (21), the sliding seat (15) and the sliding rod (17) are all arranged inside the mounting cavity (12); a sink groove (201) is arranged on the lower wall of the lower mold base (2); and the ejecting plate (11) is slidably connected to the inner wall of the sink groove (201).

2. A composite material compression molding device according to claim 1, characterized in that: The connecting seat (13) is fixedly connected to the upper wall of the inner side of the installation cavity (12); an air storage cavity (1301) is arranged inside the connecting seat (13); the sliding seat (15) is fixedly connected to the lower wall of the connecting seat (13); the fixed insert (14) is arranged on the upper wall of the connecting seat (13); the outer wall of the fixed insert (14) passes through the inner wall of the lower template (5); the inner wall of the fixed insert (14) is provided with a matching hole (1401) which is through-through from top to bottom; the movable insert (21) is slidably connected to the inner wall of the matching hole (1401). The end of the fixed insert (14) away from the connecting seat (13) and the upper end of the movable insert (21) are both flush with the lower molding surface of the lower template (5); the sliding rod (17) is fixedly connected to the lower end of the movable insert (21); the upper end of the sliding rod (17) is provided with a rectangular hole (1702); the lower end of the movable insert (21) is provided with a rectangular connecting block (2101); the outer wall of the rectangular connecting block (2101) is adapted to the inner cavity of the rectangular hole (1702); and a spacer is provided between the sliding rod (17) and the movable insert (21). The rectangular connecting block (2101) is inserted into the rectangular hole (1702) and is fixed by screws. The end of the sliding rod (17) away from the movable insert (21) passes through the inner wall of the sliding seat (15) and is slidably connected thereto. The end of the sliding rod (17) extending below the sliding seat (15) is fixedly connected to a connecting rod (18). The end of the connecting rod (18) away from the sliding rod (17) passes through the inner wall of the pad (4) and the inner wall of the lower die seat (2) in sequence and extends into the interior of the sink groove (201). The connecting rod (18) extends into the sink groove ( One end of the interior of the push plate (201) is fixedly connected to the upper wall of the ejection plate (11), the lower end of the sliding seat (15) is fixedly connected to the shell (16), a locking structure for locking the axial position of the sliding rod (17) is provided between the interior of the shell (16) and the sliding rod (17), a driving structure for driving the ejection plate (11) to move up and down is provided between the lower die seat (2) and the push plate (11), and a guiding structure for maintaining stability when the ejection plate (11) moves up and down is provided between the ejection plate (11) and the lower die seat (2).

3. A composite material compression molding device according to claim 2, characterized in that: An air intake connector (19) is fixedly connected to the side wall of the connection seat (13), and the air intake connector (19) is connected to the interior of the air storage chamber (1301). An end of the air intake connector (19) away from the connection seat (13) is connected to the air supply device via an air pipe. A pressure sensor (20) is fixedly connected to the front wall of the connection seat (13), and a detection end of the pressure sensor (20) passes through the front wall of the connection seat (13) and extends into the interior of the air storage chamber (1301).

4. A composite material compression molding device according to claim 3, characterized in that: The locking structure comprises an annular groove (1701), a magnetic powder bag (26) and an electromagnetic coil (25); the sliding rod (17) is located in a section between the sliding seat (15) and the connecting rod (18) and penetrates the interior of the shell (16); the annular groove (1701) is arranged on the outer wall of the sliding rod (17) and is located inside the shell (16); the electromagnetic coil (25) is arranged on the inner wall of the shell (16); the magnetic powder bag (26) is arranged on the inner wall of the shell (16) and is located between the electromagnetic coil (25) and the sliding rod (17); the magnetic powder bag (26) is composed of a plurality of groups of magnetic powder; a second sealing ring (23) and a third sealing ring (24) are respectively arranged on the inner wall of the shell (16) and near the upper and lower ends; the inner walls of the second sealing ring (23) and the third sealing ring (24) are both slidably connected to the outer wall of the sliding rod (17).

5. A composite material compression molding device according to claim 4, characterized in that: The driving structure comprises two groups of cylinders (10). The upper wall of the lower die base (2) is fixedly connected to two groups of top plates (9) via four groups of support plates (8). The two groups of top plates (9) are respectively arranged on the front and rear sides of the pad (4). The two groups of cylinders (10) are respectively fixedly connected to the lower walls of the two groups of top plates (9). The extension shafts of the two groups of cylinders (10) penetrate the inner wall of the lower die base (2) and extend into the interior of the sink (201). One end of the extension shaft of the cylinder (10) extending into the interior of the sink (201) is fixedly connected to the upper wall of the ejector plate (11).

6. A composite material compression molding device according to claim 5, characterized in that: The guide structure comprises four groups of guide seats (6), the four groups of guide seats (6) are all fixedly connected to the upper wall of the lower die seat (2) and are located in pairs at the front and rear sides of the pad (4), the inner wall of the guide seat (6) is slidably connected to a guide column (7), the lower end of the guide column (7) passes through the inner wall of the lower die seat (2) and extends into the interior of the sink groove (201), and the end of the guide column (7) extending into the interior of the sink groove (201) is fixedly connected to the upper wall of the ejector plate (11).

7. A composite material compression molding device according to claim 6, characterized in that: The movable insert (21) has a truncated cone shape and the diameter of the upper end is smaller than the diameter of the lower end. The diameter of the lower end of the movable insert (21) is consistent with the outer diameter of the sliding rod (17). The inner shape of the matching hole (1401) is compatible with the shape of the movable insert (21). The outer wall of the movable insert (21) is provided with multiple groups of first sealing rings (22) in sequence from top to bottom.

8. A composite material compression molding device according to claim 7, characterized in that: The sliding rod (17) and the sliding seat (15) are sealed via a fifth sealing ring (28), and the sliding seat (15) and the connecting seat (13) are sealed via a fourth sealing ring (27).

9. A composite material compression molding device according to claim 8, characterized in that: The connecting rod (18) has a square cross-section, and a fixing hole adapted to the connecting rod (18) is provided on the upper wall of the ejector plate (11) and at a position opposite to the connecting rod (18) above and below. The connecting rod (18) and the ejector plate (11) are fixed by screws after the connecting rod (18) is inserted into the fixing hole.

10. The molding method of a composite material compression molding device according to claim 9, characterized in that: The molding method comprises the following steps: S1, filling a composite material prepreg containing fibers and resin into a pre-pressing mold for pre-pressing to obtain a composite material preform; S2, placing the composite material preform between the upper template (3) and the lower template (5), and after the upper template (3) and the lower template (5) are driven by the device to pressurize and heat, the composite material preform is cured and formed to obtain a composite material finished product. During the curing process, the movable insert (21) is fixed in axial position by a locking structure, and the upper end surfaces of the movable insert (21) and the fixed insert (14) and the upper side of the lower template (5) are kept to form a lower molding surface together. While curing and forming, the air supply device injects compressed air into the air storage cavity (1301), and the pressurization condition is detected by the pressure sensor (20); S3, after the equipment drives the upper mold plate (3) to separate from the lower mold plate (5), the electromagnetic coil (25) in the locking structure is powered off, the magnetic powder in the magnetic powder bag (26) loses its magnetism and pulverizes, the axial locking state of the sliding rod (17) is released, the cylinder (10) extends its shaft, drives the ejector plate (11) to move downward, the ejector plate (11) drives the movable insert (21) to move downward through the connecting rod (18) and the sliding rod (17), after the movable insert (21) moves downward, a gap is formed between the movable insert (21) and the matching hole (1401), the pressurized air in the air storage chamber (1301) is blown out from the gap, the finished composite material after solidification is separated from the lower molding surface of the lower mold plate (5), and the finished product is taken out manually or by a robot; S4. After the finished composite material is taken out, the cylinder (10) extends and retracts its shaft, driving the ejector plate (11) to move upward. During the upward movement of the ejector plate (11), the movable insert (21) is driven upward by the connecting rod (18) and the sliding rod (17), until the outer wall of the movable insert (21) is completely fitted with the inner wall of the matching hole (1401). After the movable insert (21) is completely fitted with the matching hole (1401), a sealing state inside the air storage chamber (1301) is achieved by using multiple sets of first sealing rings (22), fourth sealing rings (27) and fifth sealing rings (28); S5. After the movable insert (21) and the matching hole (1401) are fitted together, the electromagnetic coil (25) is energized to generate magnetism, so that the magnetic powder in the magnetic powder bag (26) is magnetically solidified, the axial position of the sliding rod (17) is locked, and the air intake device injects compressed air into the air storage chamber (1301) again, and the above steps are repeated.

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