A T-shaped composite material long stringer rapid prototyping device and prototyping method

Abstract

The present invention discloses a T-shaped composite material long stringer rapid prototyping device and a prototyping method, which relate to the technical field of composite material part prototyping, and in particular to a composite material T-shaped long stringer rapid manufacturing method. The prototyping device comprises a fixed mold, a movable mold, a cover plate, a bottom plate, a prestressed component, and an alloy block. The T-shaped long stringer is sequentially shaped in the vertical and horizontal directions through the cooperation of the prestressed component and a high-strength, low-melting-point alloy. The prototyping device has strong reusability and stable prototyping quality, and can greatly improve the manufacturing efficiency of large quantities of composite material long strings.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material parts forming, and in particular to a composite material T-shaped long stringer rapid forming device and forming method. Technical Background

[0002] T-shaped composite stringers are common large-scale composite reinforced structures, widely used in composite wall panels. Currently, the industry often uses autoclave technology to manufacture thermosetting resin-based T-stringers. This manufacturing process involves multiple steps, resulting in long production cycles and high costs, making it difficult to meet the needs of rapid project development. Using a non-autoclave molding process to manufacture thermoplastic resin-based T-stringers is one solution to this problem.

[0003] Currently, the industrial manufacturing of continuous fiber-reinforced thermoplastic resin-based composites primarily focuses on simple components, while typical parts, such as T-stringers, are still in the pre-research stage. One of the manufacturing challenges is controlling wrinkle defects. To meet aerodynamic requirements, the shape of T-stringers in actual projects is irregular, making fiber wrinkle defects prone to occur during the manufacturing process, impacting the product's molding quality. Furthermore, the unique structure of T-stringers places high demands on their molding molds. Therefore, there is an urgent need to explore a manufacturing method for composite T-stringers that can achieve efficient and high-quality manufacturing. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a T-shaped composite long stringer rapid prototyping device and prototyping method. By utilizing the technical characteristics of thermoplastic resin-based composite materials reshaping, the prepreg cutting, laying, compacting and other processes in the traditional manufacturing process are replaced by commercially purchased or prefabricated standard T-shaped long strings. At the same time, the long stringers required for the project are manufactured by oven reshaping, which reduces the manufacturing cycle and manufacturing costs.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A T-shaped composite long girder rapid prototyping device includes a fixed mold, a movable mold, a cover plate, a bottom plate, a prestressed component, and an alloy block. The fixed mold and the movable mold are used for mold combination. The fixed mold is fixed to the bottom plate. The movable mold slides on the bottom plate to be molded with the fixed mold or away from the fixed mold. An L-shaped groove is provided on one side of the fixed mold and the movable mold. The L-shaped groove after mold combination forms a T-shaped groove consistent with the design shape of the lower surface and side of the vertical rib and bottom edge of the T-shaped long girder. The T-shaped long girder to be shaped is placed in the T-shaped groove after mold combination. The outer sides of the L-shaped grooves of the fixed mold and the movable mold are provided with sealing strip placement grooves. Two positioning blocks are fixed on the bottom plate at the two end positions of the fixed mold and the movable mold after mold combination. The support rod is fixed on the upper surface of the positioning block, the cover plate passes through the support rod and can move up and down along the support rod until it covers the upper surface of the fixed mold and the movable mold, the support rod, the cover plate and the positioning block are matched in a clearance fit, the cover plate and the positioning block are precisely positioned using a cup-cone positioning device, the lower surface shape of the cover plate is consistent with the design shape of the upper surface of the bottom edge of the T-shaped long stringer, and the bottom of the outer side surface after the fixed mold and the movable mold are closed is provided with prestressed component mounting holes evenly distributed throughout the entire mold body, and a plurality of alloy blocks are embedded around the L-shaped groove along the closing surface of the fixed mold, the position of the alloy blocks avoids the prestressed component mounting holes, and an alloy collection tank is provided below the alloy blocks on the bottom plate.

[0007] Furthermore, the alloy block material is a high-strength low-melting-point alloy, and the melting point of the alloy block is lower than the viscous flow temperature of the T-shaped composite stringer and is much higher than its glass transition temperature.

[0008] Furthermore, the movable mold is connected to the base plate through a slide rail and slider structure.

[0009] Furthermore, the movable mold, the fixed mold and the cover plate are made of metal materials with a thermal expansion coefficient close to that of the long stringer.

[0010] Furthermore, the prestressed component includes a spring, a screw, and a nut. The spring is sleeved on the screw. The screw passes through the mounting hole of the prestressed component and is fixed to one side of the mold body through the nut.

[0011] The method for rapid prototyping using the prototyping device comprises the following steps:

[0012] 1. Place the purchased or prefabricated thermoplastic resin-based standard T-shaped long stringer in the L-shaped groove position of the fixed mold;

[0013] 2. Place alloy blocks around the L-shaped groove of the fixed mold, and place sealing strips in the sealing strip placement grooves on the fixed mold and movable mold;

[0014] 3. Close the movable mold and the fixed mold;

[0015] 4. Fix the prestressed component and tighten it with nuts to apply preload;

[0016] 5. Pass the cover plate through the support rod and cover the upper surface of the mold after mold closing;

[0017] 6. Place the mold assembled in step 5 into the oven and reshape the standard T-shaped long stringer according to the process temperature curve;

[0018] 7 Remove the cover plate and prestressed components in turn, move the movable mold to separate it from the fixed mold, and obtain the shaped T-shaped long girder after demoulding.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The T-shaped composite long stringer rapid prototyping device and forming method provided by the present invention utilize the reshaping properties of thermoplastic composite materials to achieve rapid manufacturing of composite long strings. By combining prestressed components with high-strength, low-melting-point alloy blocks, the standard T-shaped long stringer undergoes thermal deformation in both the vertical and horizontal directions, avoiding the formation of wrinkles during the forming process. The cover plate is roughly positioned using support rods and precisely positioned using a cup-cone positioning system, ensuring the accuracy of the T-shaped long stringer's shaping surface. The fixed mold and the movable mold are each provided with a left-right symmetrical L-shaped groove. When combined, they form a cavity with the cover plate to form the required shaping surface for the T-shaped long stringer, avoiding the use of thickness control sheets and facilitating the tightening operation of the prestressed components. The positions of the components in the forming device of the present invention are relatively fixed, which is conducive to improving the efficiency of reuse. Compared with the traditional autoclave forming process, the forming method provided by the present invention uses an oven to reshape the thermoplastic T-shaped long stringer, which has low manufacturing costs and high manufacturing efficiency.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the forming device structure and T-type long stringer;

[0023] Figure 2 Schematic diagram of fixed mold structure;

[0024] Figure 3 Schematic diagram of the movable mold structure;

[0025] Figure 4 Schematic diagram of the cover structure;

[0026] Figure 5 Schematic diagram of the base plate structure.

[0027] Explanation of the markings in the figure: 1. Fixed mold; 2. Moving mold; 3. Cover plate; 4. Bottom plate; 5. Prestressed component; 6. Alloy block; 7. L-shaped groove; 8. Sealing strip placement groove; 9. Support rod; 10. Positioning block; 11. Prestressed component mounting hole; 12. Spring; 13. Screw; 14. Nut; 15. Standard T-shaped long girder; 16. T-shaped long girder after shaping. DETAILED DESCRIPTION

[0028] like Figure 1-Figure 5 As shown, a T-shaped composite long girder rapid prototyping device includes a fixed mold 1, a movable mold 2, a cover plate 3, a bottom plate 4, a prestressed component 5, and an alloy block 6. The fixed mold 1 and the movable mold 2 are used for mold combination, the fixed mold 1 is fixed on the bottom plate 4, and the movable mold 2 slides on the bottom plate 4 to be molded with the fixed mold 1 or away from the fixed mold 1. An L-shaped groove 7 is provided on one side of the mold combination of the fixed mold 1 and the movable mold 2. The L-shaped groove 7 after mold combination forms a T-shaped groove consistent with the vertical ribs and the lower surface and side design of the bottom edge of the T-shaped long girder 16. The T-shaped long girder 15 to be shaped is placed in the T-shaped groove after mold combination. The outer sides of the L-shaped groove 7 of the fixed mold 1 and the movable mold 2 are provided with a sealing strip placement groove 8. Two positioning blocks 10 are fixed on the bottom plate 4 at both ends of the fixed mold 1 and the movable mold 2 after mold combination. The cover plate 3 is in the upper position of the head, the support rod 9 is fixed on the upper surface of the positioning block 10, the cover plate 3 passes through the support rod 9 and can move up and down along the support rod 9 until it covers the upper surface of the fixed mold 1 and the movable mold 2. The support rod 9, the cover plate 3 and the positioning block 10 are matched in a clearance fit. The cover plate 3 and the positioning block 10 are precisely positioned using a cup-cone positioning device. The shape of the lower surface of the cover plate 3 is consistent with the design shape of the upper surface of the bottom edge of the T-shaped long girder 16. The bottom of the outer side surface after the fixed mold 1 and the movable mold 2 are closed is provided with prestressed component mounting holes 11 evenly distributed throughout the entire mold body. A plurality of alloy blocks 6 are embedded around the L-shaped groove 7 along the closing surface of the fixed mold 1. The position of the alloy block 6 avoids the prestressed component mounting hole 11, and an alloy collecting tank is provided below the alloy block 6 on the bottom plate 4.

[0029] Furthermore, the alloy block 6 is made of a high-strength, low-melting-point alloy, and the melting point of the alloy block 6 is lower than the viscous flow temperature of the T-shaped composite stringer 15 and much higher than its glass transition temperature.

[0030] Furthermore, the movable mold 2 is connected to the base plate 4 via a slide rail and slider structure.

[0031] Furthermore, the movable mold 2 , the fixed mold 1 , and the cover plate 3 are made of metal materials having a thermal expansion coefficient close to that of the long stringer.

[0032] Furthermore, the prestressed component 5 includes a spring 12 , a screw 13 , and a nut 14 . The spring 12 is sleeved on the screw 13 . The screw 13 passes through the prestressed component mounting hole 11 and is fixed to one side of the mold body through the nut 14 .

[0033] The method for rapid prototyping using the prototyping device comprises the following steps:

[0034] 1. Place the purchased or prefabricated thermoplastic resin-based standard T-shaped long stringer 15 in the L-shaped groove 7 of the fixed mold 1;

[0035] 2. Place the alloy block 6 around the L-shaped groove 7 of the fixed mold 1, and place the sealing strip in the sealing strip placement groove 8 on the fixed mold 1 and the movable mold 2;

[0036] 3. Close the movable mold 2 and the fixed mold 1;

[0037] 4 Fix the prestressed component 5 and tighten it with the nut 14 to apply the preload force;

[0038] 5. Pass the cover plate 3 through the support rod 9 and cover the upper surface of the mold body after mold closing;

[0039] 6. Place the mold assembled in step 5 into an oven and reshape the standard T-shaped long stringer 15 according to the process temperature curve;

[0040] 7. Remove the cover plate 3 and the prestressed component 5 in sequence, move the movable mold 2 to separate it from the fixed mold 1, and after demoulding, obtain the shaped T-shaped long girder 16.

[0041] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A T-shaped composite long stringer rapid prototyping device, characterized in that It includes a fixed mold, a movable mold, a cover plate, a bottom plate, a prestressed component, and an alloy block. The fixed mold and the movable mold are used for mold combination. The fixed mold is fixed on the bottom plate. The movable mold slides on the bottom plate to be molded with the fixed mold or away from the fixed mold. An L-shaped groove is provided on one side of the fixed mold and the movable mold. The L-shaped groove after mold combination is consistent with the T-shaped groove of the vertical rib and the lower surface and side design of the bottom edge of the T-shaped long girder. The T-shaped long girder to be shaped is placed in the T-shaped groove after mold combination. A sealing strip placement groove is provided around the outside of the L-shaped groove of the fixed mold and the movable mold. Two positioning blocks are fixed on the bottom plate at the two end positions of the fixed mold and the movable mold after mold combination. The support rod is fixed on the fixed mold. The cover plate passes through the support rod and can move up and down along the support rod until it covers the upper surface of the fixed mold and the movable mold. The support rod, the cover plate and the positioning block are matched with a clearance fit. The cover plate and the positioning block are precisely positioned using a cup-cone positioning device. The shape of the lower surface of the cover plate is consistent with the design shape of the upper surface of the bottom edge of the T-shaped long girder. The bottom of the outer side surface after the fixed mold and the movable mold are closed is provided with evenly distributed prestressed component mounting holes that run through the entire mold body. A number of alloy blocks are embedded around the L-shaped groove along the closing surface of the fixed mold. The position of the alloy blocks avoids the prestressed component mounting holes, and an alloy collection tank is provided below the alloy blocks on the bottom plate.

2. A T-shaped composite long stringer rapid prototyping device according to claim 1, characterized in that The alloy block material is a high-strength, low-melting-point alloy, and the melting point of the alloy block is lower than the viscous flow temperature of the T-shaped composite material long stringer and is much higher than its glass transition temperature.

3. A T-shaped composite material long stringer rapid prototyping device according to claim 1, characterized in that The movable mold is connected to the bottom plate through a slide rail and slider structure.

4. A T-shaped composite material long stringer rapid prototyping device according to claim 1, characterized in that The movable mold, fixed mold and cover plate are made of metal materials with a thermal expansion coefficient close to that of the long stringer.

5. The T-shaped composite long stringer rapid prototyping device according to claim 1, characterized in that The prestressed component includes a spring, a screw, and a nut. The spring is sleeved on the screw. The screw passes through the prestressed component mounting hole and is fixed to one side of the mold body through the nut.

6. A method for rapid prototyping of a T-shaped composite long stringer, characterized in that A method for rapid prototyping using the T-shaped composite material long stringer rapid prototyping device according to any one of claims 1 to 5, the specific process comprising the following steps: 6-1 Place the purchased or prefabricated thermoplastic resin-based standard T-shaped long stringer in the L-shaped groove position of the fixed mold; 6-2 Place alloy blocks around the L-shaped groove of the fixed mold, and place sealing strips in the sealing strip placement grooves on the fixed mold and movable mold; 6-3 Close the movable mold and the fixed mold; 6-4 Fix the prestressed component and tighten it with nuts to apply preload force; 6-5 Pass the cover plate through the support rod and cover the upper surface of the mold after mold closing; 6-6 Place the forming mold assembled in step 6-5 into an oven and complete the reshaping of the standard T-shaped long stringer according to the process temperature curve; 6-7 Remove the cover plate and prestressed components in turn, move the movable mold to separate it from the fixed mold, and obtain the shaped T-shaped long girder after demoulding.

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