A three-dimensional preform single needle knitting forming device and method

Abstract

The application discloses a three-dimensional preform single-knitting forming device and method. The three-dimensional preform single-knitting forming device comprises a yarn output mechanism, a guide mechanism and a compaction mechanism. The knitting forming method of the device is that a mechanical arm moves the output yarn in the guide array above the lower hole plate, and when a layer is knitted, the upper hole plate is pressed downward along the guide rail to compact the preform. After multiple knitting and compaction, the knitting of the large-thickness preform can be realized, the size precision of the preform component is improved, and the mechanical properties of the preform are improved. Compared with the prior art, the application realizes the knitting of the large-thickness preform, and solves the problems of low interlayer strength in the thickness direction of the preform, easy delamination and low impact toughness and damage tolerance.

Description

Technical Field

[0001] This invention relates to the field of three-dimensional preform weaving technology, specifically to a three-dimensional preform single-knitting weaving device and method. Background Technology

[0002] Digital single-knitting forming systems and equipment are suitable for the fabrication of large, variable-section, high-density, high-performance fiber composite material components. They can achieve fiber-oriented layout of individual fibers and the overall prefabricated structure, enabling the three-dimensional structural weaving of complex composite prefabricated components. Currently, three-dimensional woven prefabricated forming equipment can only weave relatively thin prefabricated components. For thicker composite prefabricated components, integrated forming is difficult, typically requiring multi-layer lamination and stitching. This method suffers from low interlayer strength in the thickness direction, easy delamination, low impact toughness, damage tolerance, and low efficiency, significantly impacting the dimensional accuracy and mechanical properties of the prefabricated components. Therefore, a single-knitting forming device for thick three-dimensional prefabricated components needs to be designed to solve these problems. Summary of the Invention

[0003] Purpose of the invention: To solve the above problems, the present invention provides a three-dimensional preform single-knitting forming device and method, which solves the problems of low interlayer strength in the thickness direction of the preform, easy delamination, and low impact toughness and damage tolerance, while being able to knit preforms with large thickness.

[0004] Technical Solution: To achieve the above objectives, the technical solution adopted by the three-dimensional preform single-knitting forming device of the present invention is as follows: The three-dimensional preform single-knitting forming device includes a yarn feeding mechanism, a guiding mechanism, and a compaction mechanism; the yarn feeding mechanism includes a robotic arm and a hollow needle at the tip of the robotic arm; the guiding mechanism includes several guide rods and guide rails; the compaction mechanism includes an upper perforated plate, a lower perforated plate located below the upper perforated plate, a first steel frame fixed to the lower side of the upper perforated plate, a second steel frame fixed to the upper side of the lower perforated plate, a top plate, and a bottom plate located below the top plate. The system consists of a lead screw, a motor, a lead screw jack connected to the motor, and a linkage shaft passing through the top plate from top to bottom; several guide rods pass through the lower perforated plate and the second steel frame from bottom to top, and a guide rail passes through the upper perforated plate vertically, with both ends of the guide rail fixed to the top and bottom plates; the steel frame includes a first steel frame and a second steel frame, both of which are hollow rectangles, with several guide rods passing through the hollow parts, which are adapted to the guide rod array; the linkage shaft connects two lead screw jacks; the yarn output mechanism outputs yarn between the guide rods, and the compaction mechanism moves along the guide rail.

[0005] Furthermore, the yarn feeding mechanism is independent of the guiding mechanism and the compaction mechanism.

[0006] Furthermore, the robotic arm is a six-axis robotic arm.

[0007] Furthermore, yarn passes through the hollow needle at the tip of the robotic arm.

[0008] Furthermore, the guide rods are arranged in an orderly manner to form a guide array.

[0009] Furthermore, the guide rails are provided with four rails and the lead screws are provided with two screws.

[0010] Furthermore, the compaction mechanism uses a linkage shaft to enable two screw jacks to simultaneously control the rotation of the screws, thereby allowing the compaction mechanism to move along the guide rail.

[0011] Furthermore, the shape of the hollowed-out portion is consistent with the external shape that the preform is to achieve.

[0012] The technical solution adopted by the weaving and forming method of the three-dimensional preform single-knitting forming device of the present invention is as follows:

[0013] a) Calculate the diameter and spacing of the guide rods based on the precast structure, make holes in the upper and lower perforated plates, and pass the guide rods through the lower perforated plate;

[0014] b) Based on the designed prefabricated body, the robotic arm is operated to make the hollow needles in the yarn output mechanism move in an orderly manner in the guide array, while outputting the yarn and winding the yarn onto the guide bar.

[0015] c) After completing one layer of weaving, lift the robotic arm, control the upper perforated plate to move downward along the guide rail and cover the lower perforated plate, then move the upper perforated plate upward along the guide rail to return to the initial position. Repeat this process multiple times to complete the compaction.

[0016] d) Repeat steps b) and c) until the designed prefabricated body is woven in place;

[0017] e) After the final compaction is completed, press the upper perforated plate onto the lower perforated plate, fix the two steel frame frames together, and then remove the two steel frame frames and guide rods together.

[0018] f) Remove the guide rods and replace them with yarn to complete the weaving of the thick precast body.

[0019] Furthermore, in step b), the hollow needle moves at 0°, 45°, or 90° within the guide array.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant effects: the device of the present invention realizes the weaving of thick preforms, and at the same time solves the problems of low interlayer strength, easy delamination, and low impact toughness and damage tolerance in the thickness direction of the preforms. Attached Figure Description

[0021] Figure 1 This is a front view of the single-knitting forming apparatus provided by the present invention.

[0022] Figure 2 A side view of the single-knitting forming apparatus provided by the present invention.

[0023] Figure 3 This is a schematic diagram of the single-knitting forming device provided by the present invention when performing the compaction step.

[0024] Figure 4 A schematic diagram of the upper perforated plate of the single-knitting forming device provided by the present invention. Detailed Implementation

[0025] This invention discloses a three-dimensional preform single-knitting forming device and method. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 4 As shown below, the three-dimensional preform single-knitting forming device provided by the present invention will be further described in detail: The three-dimensional preform single-knitting forming device includes a yarn feeding mechanism 10, a guiding mechanism 20, and a compaction mechanism 30. The yarn feeding mechanism 10 is independent of the guiding mechanism 20 and the compaction mechanism 30. The yarn feeding mechanism 10 includes a robotic arm 101 and a hollow needle 102 at the tip of the robotic arm. The robotic arm 101 is a six-axis robotic arm, and yarn passes through the hollow needle 102 at the tip of the robotic arm. The guiding mechanism 20 includes a plurality of guide rods 201 and guide rails 202. The plurality of guide rods 201 are arranged in an orderly manner to form a guiding array. Four guide rails 202 are provided. The guide rails 202 pass through the perimeter of the two perforated plates in a vertical direction and are fixed. The plurality of guide rods 201 pass through the lower perforated plate 302 and the second steel frame from bottom to top. The compaction mechanism 30 includes an upper perforated plate 301 and a compaction mechanism located below the upper perforated plate 301. The structure includes a lower perforated plate 302, a first steel frame fixed to the lower side of the upper perforated plate 301, a second steel frame fixed to the upper side of the lower perforated plate 302, a top plate 308, a bottom plate located below the top plate 308, a lead screw 307 passing through the top plate 308 from top to bottom, a motor 304, a lead screw jack 305 connected to the motor 304, and a linkage shaft 306. The linkage shaft 306 connects two lead screw jacks 305. The steel frame 303 includes a first steel frame and a second steel frame, both of which are hollow rectangles. Several guide rods 201 pass through the hollow parts, which are adapted to the guide rod array. The shape of the hollow parts is consistent with the external shape to be achieved by the preform. The yarn output mechanism 10 outputs yarn between the guide rods 201. The compaction mechanism 30 realizes that the two lead screw jacks 305 simultaneously control the rotation of the lead screw 307 through the linkage shaft 306, thereby causing the compaction mechanism 30 to move along the guide rail 202.

[0026] Please see Figure 3As shown, the weaving method of the three-dimensional prefabricated single-knitting forming device provided by the present invention will be further described in detail below: a) Calculate the diameter and spacing of the guide rods 201 according to the prefabricated structure, make holes in the upper perforated plate 301 and the lower perforated plate 302, and pass the guide rods 201 through the lower perforated plate; b) According to the designed prefabricated structure, operate the robotic arm 101 so that the hollow needles 102 in the yarn feeding mechanism 10 can move along 0°, 45° or 90° in the guide array, and output yarn at the same time, winding the yarn around the guide rods 201; c) After completing one layer of weaving, lift the robotic arm 101, start the motor 304, and use the linkage shaft 306 to make the two screw jacks 305 move together. The two lead screws 307 are rotated in time, which causes the upper perforated plate 301 to move downward along the guide rail 202 and cover the lower perforated plate 302. Then the upper perforated plate 301 moves upward along the guide rail 202 and returns to the initial position. This process is repeated multiple times to complete the compaction. d) Repeat steps b) and c) until the designed preform is woven. e) After the final compaction, press the upper perforated plate 301 onto the lower perforated plate 302, and at the same time disassemble the steel frame 303. Then fix the two steel frames 303 together, and then remove the two steel frames 303 and the guide rod 201 together. f) Remove the guide rod 201 and replace it with yarn to complete the weaving of the thick preform.

Claims

1. A three-dimensional preform single-knitting forming device, characterized in that, The system includes a yarn feeding mechanism (10), a guiding mechanism (20), and a compaction mechanism (30). The yarn feeding mechanism (10) includes a robotic arm (101) and a hollow needle (102) at the tip of the robotic arm. The guiding mechanism (20) includes several guide rods (201) and a guide rail (202). The compaction mechanism (30) includes an upper perforated plate (301), a lower perforated plate (302) located below the upper perforated plate (301), a first steel frame fixed to the lower side of the upper perforated plate (301), a second steel frame fixed to the upper side of the lower perforated plate (302), a top plate (308), a bottom plate (309) located below the top plate (308), a lead screw (307) passing through the top plate (308) from top to bottom, a motor (304), a lead screw jack (305) connected to the motor (304), and a linkage shaft (306). The several guide rods (201) pass through the lower perforated plate (302) from bottom to top and The second steel frame has a guide rail (202) that passes vertically through the upper perforated plate (301). The two ends of the guide rail (202) are fixed to the top plate and the bottom plate. The steel frame (303) includes a first steel frame and a second steel frame, both of which are hollow rectangles. Several guide rods (201) pass through the hollow part, and the hollow part is adapted to the guide rod array. The linkage shaft (306) connects two screw jacks (305). The yarn output mechanism (10) outputs yarn between the guide rods (201), and the compaction mechanism (30) moves along the guide rail (202). The robotic arm (101) is a six-axis robotic arm. The several guide rods (201) are arranged in an orderly manner to form a guide array. The compaction mechanism (30) realizes that the two screw jacks (305) simultaneously control the screw (307) to rotate through the linkage shaft (306), so that the compaction mechanism (30) moves along the guide rail (202).

2. The three-dimensional preform single-knitting forming device according to claim 1, characterized in that, The yarn feeding mechanism (10) is independent of the guiding mechanism (20) and the compaction mechanism (30).

3. The three-dimensional preform single-knitting forming device according to claim 1, characterized in that, A yarn passes through the hollow needle (102) at the tip of the robotic arm.

4. The three-dimensional preform single-knitting forming device according to claim 1, characterized in that, The guide rail (202) has four rails and the lead screw (307) has two rails.

5. The three-dimensional preform single-knitting forming device according to claim 1, characterized in that, The shape of the hollowed-out portion is consistent with the desired external shape of the preform.

6. A weaving and forming method using a three-dimensional preform single-knitting forming apparatus as described in any one of claims 1 to 5, characterized in that, Includes the following steps: a) Calculate the diameter and spacing of the guide rods (201) according to the precast structure, make holes in the upper perforated plate (301) and the lower perforated plate (302), and pass the guide rods (201) through the lower perforated plate; b) According to the designed prefabricated body, the robotic arm (101) is operated to make the hollow needle (102) in the yarn feeding mechanism (10) move in an orderly manner in the guide array, and at the same time output the yarn and wind the yarn onto the guide bar (201); c) After completing one layer of weaving, lift the robotic arm (101), control the upper perforated plate (301) to move downward along the guide rail (202) and cover the lower perforated plate (302), then move the upper perforated plate (301) upward along the guide rail (202) back to the initial position, repeat multiple times to complete the compaction; d) Repeat steps b) and c) until the designed prefabricated body is woven together; e) After the final compaction is completed, press the upper perforated plate (301) onto the lower perforated plate (302), fix the two steel frame (303) together, and then remove the two steel frame (303) and guide rod (201) together; f) Remove the guide bar (201) and replace the guide bar (201) with yarn at the original position of the preform to complete the weaving of the thick preform.

7. The weaving and forming method of the three-dimensional preform single-knitting forming device according to claim 6, characterized in that, In step b), the hollow needle (102) moves along 0°, 45° or 90° in the guide array.

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