Composite material D-shaped beam forming tool and forming method

Abstract

The invention belongs to the field of molds, and relates to a composite material D-shaped beam forming tool and a forming method. The tool comprises an upper die assembly, a lower die assembly, a paddle root cover plate assembly, a pressure forming assembly, a guiding and positioning assembly and a paddle tip flat cover plate. Wherein after the upper die assembly, the lower die assembly, the paddle root cover plate assembly and the paddle tip flat cover plate are subjected to die assembly through the guiding and positioning assembly, a cavity used for containing the D-shaped beam is formed in the interior, and the pressurizing and forming assembly is inflated to open the D-shaped beam after being heated, so that the appearance of the D-shaped beam is attached to the cavity.

Description

Technical Field

[0001] The invention belongs to the field of molds and relates to a composite material D-shaped beam forming tool and a forming method. Background Art

[0002] Composite D-beams, a new type of key blade component replacing the original metal D-beam, will be widely used in various blades and wings in the future. However, they have complex structures, high requirements for cross-sectional integrity, long component lengths, small cavities, high precision requirements, and difficult molding. This makes it impossible to mold composite D-beam parts using traditional composite molding methods. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to propose a novel D-beam tooling and forming method for forming a composite material D-beam.

[0004] The technical solution of the present invention is In a first aspect, a composite material D-beam forming tool is provided, comprising: an upper die assembly, a lower die assembly, a blade root cover assembly, a pressurizing and forming assembly, a guide and positioning assembly, and a blade tip flat cover; Among them, after the four parts of the upper mold assembly, the lower mold assembly, the blade root cover assembly and the blade tip flat cover are clamped together through the guiding and positioning assembly, a cavity for accommodating the D-shaped beam is formed inside. After heating, the pressurized molding assembly is inflated to expand the D-shaped beam so that the shape of the D-shaped beam fits the cavity.

[0005] Furthermore, the upper mold assembly includes: an upper mold, an upper mold block assembly; The lower mold assembly includes: a lower mold, a lower mold side block assembly, and a lower mold inner wall block assembly; An upper die block assembly is installed in the upper die, and the upper die block assembly divides the interior of the upper die into blocks; A lower mold inner wall dividing assembly is installed in the lower mold, and the lower mold inner wall dividing assembly divides the interior of the lower mold into blocks; the lower mold bottom rounded corner blocks are obtained to obtain a lower mold side dividing assembly.

[0006] Furthermore, the lower die assembly further comprises: a side pull ring; The side pull ring is installed on the outer side of the lower mold.

[0007] Furthermore, the propeller root cover assembly includes: a propeller root upper cover, a propeller root lower cover, a propeller root cover positioning pin, and a propeller root cover mounting screw; The propeller root upper cover plate and the propeller root lower cover plate are mounted together by the propeller root cover plate mounting screws, and a mounting position for the air nozzle assembly of the pressurized molding assembly is reserved between the propeller root upper cover plate and the propeller root lower cover plate; When closing the mold, the locating pins of the propeller root cover plate are inserted into the locating holes of the propeller root lower cover plate and the lower mold to achieve mold closing positioning.

[0008] Furthermore, the pressurized molding assembly includes: an air nozzle assembly, a memory airbag; One end of the air nozzle assembly is connected to the external air path, and the other end is connected to the tubular vacuum bag in the memory airbag; the memory airbag is placed in the cavity of the lower mold assembly.

[0009] Furthermore, the guide positioning assembly includes: a guide plate, a guide plate positioning pin, and a guide plate fastening screw; The guide plate is positioned on the upper mold by the guide plate positioning pin. After positioning, it is installed on the outer side of the upper mold. A guide plate positioning groove is opened at the corresponding position of the lower mold. The guide plate and the guide plate positioning groove cooperate to achieve the initial positioning of the upper and lower molds.

[0010] Furthermore, the guide and positioning assembly further includes: a positioning pin; The locating pins are set on the parting surface of the lower mold assembly, and corresponding locating holes are set at the corresponding positions of the upper mold assembly. The locating pins and locating holes cooperate to achieve precise positioning of the upper and lower molds.

[0011] In a second aspect, a method for forming a composite material D-beam is provided, comprising: Pick up materials according to the material consumption list; Check whether the material certificate or other documents and materials confirming the material qualification are within the shelf life; CNC cutting, piece arrangement and weighing according to requirements, drawings and lists; Clean the surface of the memory airbag and spray it with release agent; Lay the D-beam in the required order and record each layer: Lay the pre-cured short cloth in the corresponding area of ​​the memory airbag; After laying, cover the upper and lower surfaces of the preform with a layer of non-porous isolation film, and place breathable felt on the isolation film; put it in a vacuum bag, seal it with sealing strips, and vacuum the root end. Each vacuuming time is 15 minutes; Apply mold release agent to the cavity of the lower mold assembly and the upper mold assembly; After pre-pressing is completed, the vacuum bag is removed and the pre-pressed memory airbag and D-shaped beam are transferred to the assembled lower mold assembly cavity. The positioning end of the positioning shaft cylinder is passed through the positioning hole on the side of the lower mold assembly and into the corresponding positioning hole on the side of the memory airbag, so that the pre-pressed memory airbag and D-shaped beam are accurately positioned in the lower mold assembly cavity. Seal one end of the tubular vacuum bag and insert the sealed end into the cavity at the root end of the memory airbag until it fits into the positioning surface of the blade tip flat cover plate at the blade tip end of the lower mold assembly; Install the non-sealed end of the tubular vacuum bag into the cone sleeve of the air nozzle assembly and tighten it to seal; Install the air nozzle assembly with the tubular vacuum bag in the corresponding positioning groove on the parting surface between the propeller root lower cover plate and the propeller root upper cover plate, and tighten the hexagon socket screw on the air nozzle assembly to ensure that the air nozzle assembly is firmly installed in the positioning groove of the propeller root lower cover plate. Install the propeller root upper cover plate on the propeller root lower cover plate and the end surface of one end of the lower mold propeller root through the propeller root cover plate positioning pins and propeller root cover plate mounting screws; Check the position of the prepreg to ensure that it does not exceed the edge of the mold cavity. Check the mold cavity and mold surface before closing the mold to ensure that there are no debris. Align the guide plate installed on the assembled upper mold assembly with the guide plate groove on the lower mold assembly, and slowly close the upper mold assembly with the lower mold assembly so that the positioning hole on the upper mold assembly coincides with the positioning pin on the lower mold assembly; Install the hexagonal nut in the slot on the side of the lower die, and insert the threaded end of the clamping screw from the U-shaped slot on the side of the bottom surface of the upper die, and screw it into the threaded hole of the hexagonal nut installed in the slot of the lower die, and tighten it with a torque wrench according to the torque requirements; Insert one end of the screw thread of the blade root cover plate mounting screw through the countersunk hole of the blade root upper cover plate, and insert one end of the screw thread of the blade tip cover plate mounting screw through the countersunk hole on the other side of the positioning surface of the blade tip flat cover plate, and use a torque wrench to screw them into the corresponding threaded holes on the blade root and blade tip surfaces of the upper mold according to the torque requirements; After assembly is completed, the outer mold is shaped and the inner tubular vacuum bag is inflated to apply counter pressure to the skin; Add air to the tubular vacuum bag through the air inlet nozzle until the pressure reaches 2.0-2.5 MPa and begin curing. Curing parameters: Place a thermocouple in the temperature measuring hole on the side of the mold and secure it. Raise the temperature at 1.5°C / min to 145±5°C, hold for 30±5 minutes, then continue to raise the temperature to 180±5°C and hold for 2-3 hours. Then cool to below 60°C, release the pressure, and demold in the reverse order of mold assembly. After demoulding, check the surface quality of the D-beam, complete the D-beam forming, and clean the mold surface to prepare for subsequent production.

[0012] The beneficial effects of this application are: BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a structural schematic diagram of a composite material D-beam forming tooling.

[0013] Figure 2 Schematic diagram of the structure of the memory airbag.

[0014] Figure 3 Schematic diagram of the structure of a tubular vacuum bag.

[0015] Among them, 1-propeller root upper cover, 2-propeller root cover locating pin, 3-air nozzle assembly, 4-propeller root cover mounting screw, 5-upper mold locating pin, 6-upper mold block assembly, 7-upper mold, 8-upper mold block fastening screw, 9-mold closing screw, 10-memory airbag, 11-propeller tip cover mounting screw, 12-propeller tip cover locating pin, 13-propeller tip flat cover, 14-locating pin, 15-guide plate locating pin, 16-guide plate, 17-guide plate fastening screw, 18-side pull ring, 19-lower mold side block assembly, 20-lower mold, 21-locating shaft, 22-locating shaft fastening screw, 23-ball head locating pin, 24-lower mold inner wall block assembly, 25-propeller root lower cover, 26-composite material D-beam, 27-tubular vacuum bag, 28-hexagonal nut. DETAILED DESCRIPTION

[0016] The present application is described in further detail below with reference to the accompanying drawings of the embodiments.

[0017] The present invention provides a composite material D-beam forming tool, such as Figure 1-3 As shown, it includes an upper mold assembly, a lower mold assembly, a blade root cover assembly, a pressurized molding assembly, a guide and positioning assembly, a blade tip flat cover, etc. The upper mold assembly includes: an upper mold 7, an upper mold positioning pin 5, an upper mold block assembly 6, and a fastening screw 8; The lower mold assembly includes: a lower mold 20, a lower mold side block assembly 19, a lower mold inner wall block assembly 24, and a side pull ring 18; The propeller root cover assembly includes: a propeller root upper cover 1, a propeller root lower cover 25, a propeller root cover positioning pin 2, and a propeller root cover mounting screw 4; The pressurized molding assembly includes: an air nozzle assembly 3, a memory airbag 10; The guide positioning assembly includes: a positioning pin 14, a guide plate 16, a guide plate positioning pin 15, a guide plate fastening screw 17; The mold clamping screw 9 is used to tighten the upper and lower molds after they are closed to prevent the upper and lower molds from separating when pressurizing; The air nozzle assembly 3 is installed between the parting surface of the propeller root upper cover plate 1 and the propeller root lower cover plate 25; The memory airbag cavity is provided with a tubular vacuum bag and is connected to the air nozzle assembly 3 to form a sealed cavity and pressurize and expand the cavity; The parting surface of the lower mold side block assembly 19 is provided with steps, which match the steps of the parting surface positions of the upper mold 7 and the lower mold 20 respectively, so as to prevent the lower mold side block assembly 19 from separating during the pressurization process.

[0018] Lower mold assembly process; The lower mold side block assembly 19 is installed on the sunken side of the lower mold 20 in the marked order, and the sunken surface of the lower mold side block assembly 19 is fitted with the corresponding sunken surface of the lower mold 20; further, one end of the ball head locating pin 23 is passed through the locating pin hole of the lower mold side block assembly 19 on the non-molding side and the lower mold 20 is located in the locating pin hole on the side of the lower mold side block assembly 19, so that the lower mold side block assembly 19 is accurately positioned on the lower mold 20; further, the blade root lower cover plate 25 is abutted against the end face of one end of the blade root of the lower mold 20, and the molding surface is facing it so that there is no obvious connection difference; further, one end of the blade root cover plate locating pin 2 is passed through the blade root lower cover plate 25 and the lower mold 20 locating hole from the side of the blade root lower cover plate 25 away from one end of the blade root of the lower mold 20, and the threaded end of the blade root cover plate mounting screw 4 is passed through from the same side Pass through the countersunk hole of the blade root lower cover plate 25 and screw it into the threaded hole on the end face of one end of the blade root of the lower mold 20 until it is tightened; further, the blade tip flat cover plate 13 is placed against the end face of one side of the blade tip of the lower mold 20, and one end of the cylindrical blade tip cover plate locating pin 12 is passed through the locating pin holes on the blade tip flat cover plate 13 and the lower mold 20 at one time, and further the blade tip cover plate mounting screw 11 is passed from the countersunk side of the countersunk hole of the blade tip flat cover plate 1 and screwed into the threaded hole on the end face of one side of the blade tip of the lower mold 20, and the screw is tightened; further, one end (small section) of the blade tip of the memory airbag 10 is passed through one end of the blade root of the D-beam 26 until it reaches one end of the blade tip of the memory airbag 10; further, the unguided ends of the two locating pins 14 are respectively assembled into the corresponding locating pin holes on the parting surface of the lower mold 20, the lower mold side block assembly 19 and the upper mold 7; upper mold assembly process: Fit the countersunk side (guide surface) of the guide plate 16 with the corresponding guide surface raised on the side of the upper mold 7, and then insert the threaded end of the fastening screw 17 from the countersunk end of the guide plate 16 countersunk hole, and screw it into the threaded hole on the guide surface on the side of the upper mold 7, so that they correspond one to one. At the same time, the guide plate locating pin 15 is installed in the guide plate 16 and the positioning hole on the side of the upper mold 7 in sequence through interference fit. Repeat the operation to install the guide plate 16 on the guide surface on the side of the upper mold 7; further, install the non-guide end of the upper mold locating pin 5 according to the interference fit In the positioning pin hole on the positioning surface of the upper mold block assembly 6; further, the upper mold block assembly 6 equipped with the upper mold positioning pin 5 is installed in the inner wall groove of the upper mold 7 according to the identification order, so that the inner wall of the upper mold 7 forms a completed molding surface; further, the threaded end of the upper mold block fastening screw 8 is inserted from the countersunk hole corresponding to the positioning groove on the upper bottom surface of the upper mold, and screwed into the threaded hole on each block of the upper mold block assembly 6, so that the upper mold block assembly 6 and the upper mold 7 are installed in place; Composite material D-shaped beam 26 molding method: Collect materials according to the material consumption list. Further check the material certificate or other documents confirming the material qualification and whether the materials are within the shelf life; further CNC cutting, cutting and weighing according to the requirements and drawings and lists; further clean the surface of the memory airbag 10 and spray the release agent; further lay the composite material D-shaped beam 26 according to the laying order requirements and record it layer by layer; further lay the pre-cured short cloth on the corresponding area of ​​the corresponding memory airbag 10; further after the laying is completed, a layer of non-porous isolation film is coated on the upper and lower surfaces of the preform, and a breathable felt is placed on the isolation film; further put it into a vacuum bag, use sealing strips to seal it, and perform vacuum operation at the root end. The vacuuming time for each time is: 15 min; further apply a release agent in the cavity of the lower mold assembly and the upper mold assembly; further remove the vacuum bag after pre-pressing, and transfer the pre-pressed memory airbag 10 and the composite material D-shaped beam 26 to the assembled lower mold assembly cavity, and pass the cylindrical positioning end of the positioning shaft 21 through the positioning hole on the side of the lower mold assembly, and penetrate into the corresponding positioning hole on the side of the memory airbag 10, so that the pre-pressed memory airbag 10 and the composite material D-shaped beam 26 are accurately positioned in the cavity of the lower mold assembly; further seal one end of the tubular vacuum bag 27, and pass the sealed end from the cavity at the root end of the memory airbag 10 until it fits with the positioning surface of the blade tip flat cover plate 13 at the blade tip end of the lower mold assembly; further install the non-sealed end of the tubular vacuum bag 27 in the conical sleeve of the air nozzle assembly 3, and tighten the seal; further install the air nozzle assembly 3 with the tubular vacuum bag 27 in the corresponding positioning groove on the parting surface of the blade root lower cover plate 25 and the blade root upper cover plate 1, and pass through Tighten the hexagon socket screw on the air nozzle assembly 3 to firmly install the air nozzle assembly 3 in the positioning groove of the blade root lower cover plate 25; further install the blade root upper cover plate 1 on the blade root lower cover plate 25 and the end face of one end of the blade root of the lower mold 20 through the blade root cover plate positioning pin 2 and the blade root cover plate mounting screw 4; check the position of the prepreg to make sure it does not exceed the edge of the mold cavity, and check the mold cavity and mold surface before closing the mold to ensure that there is no debris; further install the guide plate 16 on the assembled upper mold assembly Align the guide plate groove on the lower die 20 of the lower die assembly, and slowly close the upper die assembly with the lower die assembly, so that the positioning hole on the upper die assembly coincides with the positioning pin on the lower die assembly; further, install the hexagonal nut 28 in the groove on the side of the lower die 20, and insert the threaded end of the clamping screw 9 from the U-shaped groove on the side of the bottom surface of the upper die 7 and screw it into the threaded hole of the hexagonal nut 27 installed in the groove of the lower die 20, and use a torque wrench to tighten it according to the torque requirement;Insert the threaded end of the blade root cover plate mounting screw 4 through the countersunk hole on the blade root upper cover plate, and insert the threaded end of the blade tip cover plate mounting screw 11 through the countersunk hole on the other side of the positioning surface of the blade tip flat cover plate 13. Use a torque wrench to screw them into the corresponding threaded holes on the blade root and blade tip surfaces of the upper mold 7 according to the torque requirements. After further assembly is completed, the outer mold is used to shape the skin. The inner tubular vacuum bag is inflated to apply counterpressure to the skin. The tubular vacuum bag is further inflated through the air inlet nozzle to a pressure of 2.0-2.5 MPa to begin curing. Curing parameters: Place a thermocouple in the temperature measuring hole on the side of the mold and fix it. Raise the temperature at 1.5°C / min to 145±5°C, hold at this temperature for 30±5 minutes, then continue to raise the temperature to 180±5°C and hold at this temperature for 2-3 hours. Then cool to below 60°C to release the pressure and demold in the reverse order of molding. After further demoulding, the surface quality of the composite material D-shaped beam 26 is checked, the composite material D-shaped beam 26 is formed, and the mold surface is cleaned to prepare for subsequent production.

Claims

1. A composite material D-beam forming tool, characterized in that: include: Upper mold assembly, lower mold assembly, blade root cover assembly, pressurized molding assembly, guide and positioning assembly, blade tip flat cover; Among them, after the four parts of the upper mold assembly, the lower mold assembly, the blade root cover assembly and the blade tip flat cover are clamped together through the guiding and positioning assembly, a cavity for accommodating the D-shaped beam is formed inside. After heating, the pressurized molding assembly is inflated to expand the D-shaped beam so that the shape of the D-shaped beam fits the cavity.

2. The tooling according to claim 1, characterized in that: The upper mold assembly includes: an upper mold (7), an upper mold block assembly (6); The lower mold assembly includes: a lower mold (20), a lower mold side block assembly (19), and a lower mold inner wall block assembly (24); An upper mold block assembly (6) is installed in the upper mold (7), and the upper mold block assembly (6) divides the interior of the upper mold (7) into blocks; A lower mold inner wall block assembly (24) is installed in the lower mold (20), and the lower mold inner wall block assembly (24) blocks the interior of the lower mold (20); the bottom fillet of the lower mold (20) is divided into a lower mold side block assembly (19).

3. The tooling according to claim 2, characterized in that: The lower die assembly further comprises: a side pull ring (18); The side pull ring (18) is installed on the outer side of the lower mold (20).

4. The tooling according to claim 3, characterized in that: The propeller root cover plate assembly comprises: a propeller root upper cover plate (1), a propeller root lower cover plate (25), a propeller root cover plate positioning pin (2), and a propeller root cover plate mounting screw (4); The propeller root upper cover plate (1) and the propeller root lower cover plate (25) are mounted together by propeller root cover plate mounting screws (4), and a mounting position for the air nozzle assembly of the pressurized molding assembly is reserved between the propeller root upper cover plate (1) and the propeller root lower cover plate (25); When the mold is closed, the blade root cover plate positioning pin (2) is inserted into the blade root lower cover plate (25) and the positioning hole of the lower mold to achieve mold closing positioning.

5. The tooling according to claim 4, characterized in that: The pressurized molding component includes: an air nozzle component (3), a memory air bag (10); One end of the air nozzle assembly (3) is connected to an external air path, and the other end is connected to a tubular vacuum bag in the memory airbag (10); the memory airbag (10) is placed in the cavity of the lower mold assembly.

6. The tooling according to claim 5, characterized in that: The guide positioning assembly includes: a guide plate (16), a guide plate positioning pin (15), and a guide plate fastening screw (17); The guide plate (16) is positioned on the upper mold by the guide plate positioning pin (15). After positioning, it is installed on the outer side of the upper mold. A guide plate positioning groove is opened at the corresponding position of the lower mold. The guide plate and the guide plate positioning groove cooperate to realize the initial positioning of the upper and lower molds.

7. The tooling according to claim 6, characterized in that: The guide positioning assembly further includes: a positioning pin (14); The locating pins are set on the parting surface of the lower mold assembly, and corresponding locating holes are set at the corresponding positions of the upper mold assembly. The locating pins and locating holes cooperate to achieve precise positioning of the upper and lower molds.

8. A method for forming a composite material D-beam, characterized in that: include: Pick up materials according to the material consumption list; Check whether the material certificate or other documents and materials confirming the material qualification are within the shelf life; CNC cutting, piece arrangement and weighing according to requirements, drawings and lists; Clean the surface of the memory airbag and spray it with release agent; Lay the D-beam in the required order and record each layer: Lay the pre-cured short cloth on the corresponding area of ​​the memory airbag; After the laying is completed, cover the upper and lower surfaces of the preform with a layer of non-porous isolation film, and place a breathable felt on the isolation film; put it in a vacuum bag, seal it with sealing strips, and vacuum the root end. Each vacuuming time is 15 minutes; Apply mold release agent to the cavity of the lower mold assembly and the upper mold assembly; After pre-pressing is completed, the vacuum bag is removed and the pre-pressed memory airbag and D-shaped beam are transferred to the assembled lower mold assembly cavity. The positioning end of the positioning shaft cylinder is passed through the positioning hole on the side of the lower mold assembly and into the corresponding positioning hole on the side of the memory airbag, so that the pre-pressed memory airbag and D-shaped beam are accurately positioned in the lower mold assembly cavity. Seal one end of the tubular vacuum bag and insert the sealed end into the cavity at the root end of the memory airbag until it fits into the positioning surface of the blade tip flat cover plate at the blade tip end of the lower mold assembly; Install the non-sealed end of the tubular vacuum bag into the cone sleeve of the air nozzle assembly and tighten it to seal; Install the air nozzle assembly with the tubular vacuum bag in the corresponding positioning groove on the parting surface between the propeller root lower cover plate and the propeller root upper cover plate, and tighten the hexagon socket screw on the air nozzle assembly to ensure that the air nozzle assembly is firmly installed in the positioning groove of the propeller root lower cover plate. Install the propeller root upper cover plate on the propeller root lower cover plate and the end surface of one end of the lower mold propeller root through the propeller root cover plate positioning pins and propeller root cover plate mounting screws; Check the position of the prepreg to ensure that it does not exceed the edge of the mold cavity. Check the mold cavity and mold surface before closing the mold to ensure that there are no debris. Align the guide plate installed on the assembled upper mold assembly with the guide plate groove on the lower mold assembly, and slowly close the upper mold assembly with the lower mold assembly so that the positioning hole on the upper mold assembly coincides with the positioning pin on the lower mold assembly; Install the hexagonal nut in the slot on the side of the lower die, and insert the threaded end of the clamping screw from the U-shaped slot on the side of the bottom surface of the upper die, and screw it into the threaded hole of the hexagonal nut installed in the slot of the lower die, and tighten it with a torque wrench according to the torque requirements; Insert one end of the screw thread of the blade root cover plate mounting screw through the countersunk hole of the blade root upper cover plate, and insert one end of the screw thread of the blade tip cover plate mounting screw through the countersunk hole on the other side of the positioning surface of the blade tip flat cover plate, and use a torque wrench to screw them into the corresponding threaded holes on the blade root and blade tip surfaces of the upper mold according to the torque requirements; After assembly is completed, the outer mold is shaped and the inner tubular vacuum bag is inflated to apply counter pressure to the skin; Add air to the tubular vacuum bag through the air inlet nozzle until the pressure reaches 2.0-2.5Mpa to start curing. Curing parameters: Place a thermocouple in the temperature measuring hole on the side of the mold and fix it; raise the temperature to 145±5℃ at 1.5℃ / min, keep it at this temperature for 30±5min, then continue to raise the temperature to 180±5℃ and keep it at this temperature for 2-3 hours, then cool it to below 60℃, release the pressure and demould in the reverse order of mold loading; After demoulding, check the surface quality of the D-beam, complete the D-beam forming, and clean the mold surface to prepare for subsequent production.

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