A composite preform single edge stitching line loop forming apparatus and method

Abstract

The application discloses a kind of composite material preform single edge suture line ring forming device and method, device includes suture needle driving unit, suture material clamping unit, suture line clamping unit, line ring forming shape monitoring unit, structure unit;Method is first by suture material clamping unit clamping suture material, suture line is introduced by thread carrier in suture line clamping unit, passes through suture needle and is clamped by thread holder in suture line clamping unit, and suture needle driving unit electric push rod drives suture needle to complete suture action, then by visual sensor in line ring forming shape monitoring unit Real-time monitoring line ring forming shape.Compared with prior art, the shape change of line ring forming is monitored by visual sensor in real time in the present application, the relationship between suture process parameters such as suture needle penetration, suture line directness, suture material thickness and line ring shape in suture process is obtained, and the forming quality law of line ring with suture needle pose under different suture process parameters is ascertained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of one-side stitching of composite material preform, in particular to a one-side stitching thread loop forming device and method of composite material preform. BACKGROUND

[0002] 3D stitched composite material has excellent anti-delamination, impact resistance, fatigue resistance and near-net forming of complex components, and has been widely used in aerospace, marine vessels, vehicle engineering and sports fields. With more application requirements for large-size and complex-shaped 3D stitched composite material in the technical field, the existing double-side stitching process cannot realize the stitching of complex large-size preforms, so the one-side stitching process is proposed, in which the stitching mechanism is located on one side of the preform. The one-side stitching process includes the process of forming a thread loop by the needle retraction, and then the thread loop is hooked or another thread is passed through the thread loop. The thread loop forming quality and the timing of hooking or passing directly affect the one-side stitching quality and success rate. Therefore, a new technical solution is needed to solve the above problems. SUMMARY

[0003] The present application provides a one-side stitching thread loop forming device and method of composite material preform, which monitors the shape change of the thread loop forming in real time through a visual sensor, obtains the relationship between the stitching process parameters such as needle penetration, thread tension and stitch thickness and the thread loop shape, and verifies the forming quality law of the thread loop with the needle pose under different stitching process parameters.

[0004] Technical scheme: To achieve the above-mentioned purpose, the one-side stitching thread loop forming device of composite material preform includes a needle driving unit, a stitch material clamping unit, a thread clamping unit, a thread loop forming shape monitoring unit and a structure unit. The needle driving unit includes an electric push rod and a needle coaxially arranged with the electric push rod. The stitch material clamping unit includes a stitch material placement plate and a stitch material pressing plate located above the stitch material placement plate. The thread clamping unit includes a thread carrier connected with the stitch material placement plate and a thread clamp. The thread loop forming shape monitoring unit includes a visual sensor. The structure unit includes a vertically arranged bottom plate. The stitch material placement plate, the thread clamp and the visual sensor are fixedly connected with the bottom plate.

[0005] Further, the electric push rod is installed on an electric push rod fixed base, and the electric push rod fixed base is installed on the bottom plate.

[0006] Further, five groups of electric push rod fixed base mounting holes are provided on the bottom plate, and the electric push rod is installed at 90°, 75°, 60°, 45° and 30° with the stitch material placement plate respectively.

[0007] Further, the bottom plate is provided with four groups of visual sensor mounting holes, and the visual sensor is mounted at 0°, -15°, -30° and -45° with the seam material placing plate respectively.

[0008] Further, the seam material placing plate is used for placing seam material with a maximum size of 150mm*65mm*10mm, and the seam material is multi-layered carbon fiber woven cloth or multi-layered carbon fiber woven cloth.

[0009] Further, the seam material clamping unit further comprises a pressing knob, the seam material pressing plate applies a pressing force to the seam material in combination with the pressing knob, and the pressing force ranges from 0 to 20N.

[0010] Further, the maximum elongation of the electric push rod is 75mm.

[0011] The composite material preform single-side stitching line ring forming method comprises the following steps:

[0012] S1. Preparing the seam material and placing the forming device on the water platform surface;

[0013] S2. Turning on the power supply, resetting the electric push rod, installing and initializing the visual sensor, and then starting to collect the shape change of the line ring forming;

[0014] S3. Placing the seam material on the seam material placing plate and clamping the seam material through the seam material pressing plate;

[0015] S4. Driving the electric push rod and completing the stitching action with the sewing needle;

[0016] S5. Analyzing the line ring shape obtained by the visual sensor at different moments and determining the best moment of the line ring forming, thereby guiding the design of the stitching mechanism and the selection of the stitching parameters.

[0017] Further, the reset position of the electric push rod in S2 is the position with an elongation of 0mm.

[0018] Further, the installation position of the visual sensor in S2 is perpendicular to the direction of the sewing needle.

[0019] Beneficial effects: Compared with the prior art, the present application has the following remarkable effects: through the multiple angles between the electric push rod and the seam material plane and the multiple angles between the visual sensor and the seam material plane, a variety of stitching processes can be adapted to the actual stitching process; through the real-time monitoring of the visual sensor on the shape change of the line ring forming, the relationship between the stitching process parameters such as the sewing needle penetration, the seam line direction and the seam material thickness and the line ring shape is obtained, and the forming quality law of the line ring with the sewing needle pose under different stitching process parameters is explored. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the present application.

[0021] Figure 2 Structure diagram of the needle driving unit according to the present application.

[0022] Figure 3 Structure diagram of the material clamping unit according to the present application.

[0023] Figure 4 Structure diagram of the thread clamping unit according to the present application.

[0024] Figure 5 Structure diagram of the thread loop forming shape monitoring unit according to the present application.

[0025] Figure 6 Structure diagram of the structure unit according to the present application.

[0026] Figure 7 Position diagram of the thread carrier according to the present application.

[0027] Figure 8 Initial position diagram of the needle driving unit according to the present application.

[0028] Figure 9 Maximum extension position diagram of the electric push rod according to the present application. DETAILED DESCRIPTION

[0029] The present application discloses a kind of composite material preform unilateral suture thread loop forming device and method. Please refer to Figures 1 to 9As shown, the composite material preform single-edge stitching line loop forming device provided by the present application is further described in detail as follows: the composite material preform single-edge stitching line loop forming device comprises a needle driving unit 1, a stitching material clamping unit 2, a stitching line clamping unit 3, a line loop forming shape monitoring unit 4, and a structure unit 5. The needle driving unit 1 comprises an electric push rod 12, a needle 15, an electric push rod fixing base 12, a needle holder connecting base 13, a needle holder 14, and an electric push rod fixing base 11. One end of the needle holder connecting base 13 is connected with the needle holder 14, and the other end is connected with the electric push rod 12. The needle 15 is arranged on the needle holder 14, and the electric push rod 12 is installed on the electric push rod fixing base 11. The electric push rod 12, the needle holder connecting base 13, the needle holder 14, and the needle 15 are coaxially arranged. The maximum elongation of the electric push rod 12 is 75 mm. The stitching material clamping unit 2 comprises a stitching material placing plate 21, a stitching material pressing plate 22 arranged above the stitching material placing plate 21, a pressing knob 23, a pressing knob fixing base 24, a slide rail 25 perpendicular to the stitching material placing plate 21, and a sliding block 26. The sliding block 26 is fixedly connected with the stitching material pressing plate 22 and is installed on the slide rail 25, and simultaneously moves up and down along the slide rail 25. The pressing knob 23 is screwed into the screw hole of the pressing knob fixing base 24 and abuts against the stitching material pressing plate 22. The maximum stitching material size placed on the stitching material placing plate 21 is 150 mm x 65 mm x 10 mm. The stitching material is multi-layered carbon fiber woven cloth or multi-layered carbon fiber woven cloth. The stitching material pressing plate 22 applies a pressing force to the stitching material in combination with the pressing knob 23. The pressing force ranges from 0 to 20 N. The stitching line clamping unit 3 comprises a thread carrier 31 connected with the stitching material placing plate 21 and a thread clamp 32. The thread carrier 31 is fixedly connected with the stitching material placing plate 21. The line loop forming shape monitoring unit 4 comprises a visual sensor 41. The structure unit 5 comprises a vertical bottom plate 51. The stitching material placing plate 21, the thread clamp 32, the visual sensor 41, and the electric push rod fixing base 11 are fixedly connected with the bottom plate 51. The bottom plate 51 is provided with five groups of electric push rod fixing base 11 installation holes. After the electric push rod 12 is installed, the stitching material placing plate 21 is arranged at 90°, 75°, 60°, 45°, and 30° with the electric push rod 12, respectively. The bottom plate 51 is provided with four groups of visual sensor 41 installation holes. After the visual sensor 41 is installed, the stitching material placing plate 21 is arranged at 0°, -15°, -30°, and -45° with the visual sensor 41, respectively.

[0030] The composite material preform single-edge stitching line loop forming method provided by the present application is further described in detail as follows:

[0031] Step 1: Prepare the fabric and place the forming device on a horizontal platform. Step 2: Turn on the power, reset the electric actuator 12, install and initialize the vision sensor 41, and begin collecting data on the shape changes of the loop formation. The electric actuator 12 is reset to a position with 0mm elongation, and the vision sensor 41 is installed perpendicular to the direction of the needle 15. Step 3: Place the fabric on the fabric placement plate 21 and clamp it using the fabric clamping plate 22. Step 4: Drive the electric actuator 12, which in turn drives the needle 15 to complete the sewing action. Step 5: Analyze the loop shapes obtained by the vision sensor 41 at different times, determine the optimal time for loop formation, and guide the design of the sewing mechanism and the selection of sewing parameters. This invention adapts to various sewing processes and conforms to the actual sewing process by using multiple angles presented by the electric push rod and the sewing fabric plane, as well as multiple angles presented by the vision sensor and the sewing fabric plane. By monitoring the shape change of the suture loop in real time through the vision sensor, the relationship between sewing process parameters such as needle penetration depth, suture line straightness, and sewing fabric thickness and the shape of the suture loop was obtained, and the formation quality law of the suture loop with the needle posture under different sewing process parameters was explored.

Claims

1. A device for forming a single-sided stitch loop of a composite material preform, characterized in that, The system includes a needle drive unit (1), a fabric clamping unit (2), a thread clamping unit (3), a loop forming shape monitoring unit (4), and a structural unit (5). The needle drive unit (1) includes an electric push rod (12) and a needle (15) coaxially arranged with the electric push rod (12). The fabric clamping unit (2) includes a fabric placement plate (21) and a fabric pressing plate (22) located above the fabric placement plate (21). The thread clamping unit (3) includes a yarn carrier (31) and a thread clamp (32) connected to the fabric placement plate (21). The loop forming shape monitoring unit (4) includes a vision sensor (41). The structural unit (5) includes a vertically arranged base plate (51). The fabric placement plate (21) includes a needle drive unit (1), a fabric clamping unit (2), a thread clamping unit (3), a loop forming shape monitoring unit (4), and a structural unit (5). 1) The thread clamp (32) and the vision sensor (41) are fixedly connected to the base plate (51). The base plate (51) is provided with 5 sets of electric push rod fixing base (11) mounting holes. After the electric push rod (12) is installed, it is at 90°, 75°, 60°, 45° and 30° with the sewing material placement plate (21) respectively. The base plate (51) is provided with 4 sets of vision sensor (41) mounting holes. After the vision sensor (41) is installed, it is at 0°, -15°, -30° and -45° with the sewing material placement plate (21) respectively. The sewing material clamping unit (2) also includes a pressing knob (23). The sewing material pressing plate (22) applies a pressing force to the sewing material in combination with the pressing knob (23). The pressing force range is 0~20N.

2. The composite material preform single-sided stitch loop forming device according to claim 1, characterized in that, The electric actuator (12) is mounted on the electric actuator fixing base (11), and the electric actuator fixing base (11) is mounted on the base plate (51).

3. The composite material preform single-sided stitch loop forming device according to claim 1, characterized in that, The maximum size of the sewing material placed on the sewing material placement plate (21) is 150mm×65mm×10mm, and the sewing material is multi-layered carbon fiber woven fabric or multi-layered carbon fiber machine-woven fabric.

4. The composite material preform single-sided stitch loop forming device according to claim 1, characterized in that, The maximum elongation of the electric actuator (12) is 75 mm.

5. A forming method using the composite material preform single-sided stitch loop forming apparatus as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Prepare the sewing material and place the forming device on a horizontal platform; S2. Turn on the power, reset the electric push rod (12), install and initialize the vision sensor (41), and then start collecting the shape changes of the wire loop forming; S3. Place the fabric on the fabric placement plate (21) and clamp the fabric with the fabric clamping plate (22); S4. Drive the electric push rod (12) and drive the suture needle (15) to complete the suturing action; S5. Analyze the shape of the loop at different times obtained by the vision sensor (41) and determine the best time for loop formation to guide the design of the sewing mechanism and the selection of sewing parameters.

6. The forming method using the composite material preform single-sided stitch loop forming device according to claim 5, characterized in that, The reset position of the electric actuator (12) in S2 is the position where the elongation is 0 mm.

7. The forming method using the composite material preform single-sided stitch loop forming device according to claim 5, characterized in that, The visual sensor (41) described in S2 is installed perpendicular to the direction of the sewing needle (15).

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