A fine and dense needle punched fabric, weaving method and application thereof

Abstract

The present application relates to a kind of fine needle punching fabric, weaving method and its application, weaving method includes the following steps: first step, material preparation;Second step, base cloth laying;Third step, needle punching point positioning;Fourth step, pre-punching;Fifth step, send yarn;Sixth step, cut yarn;Seventh step, needle punching belt in;Eighth step, residual short fiber cleaning;Ninth step, by robot drive needle punching mould reaches next target needle punching point position;Tenth step, cycle fourth to ninth step, until all needle punching point positions are completed needle punching, complete fine needle punching fabric needle punching forming.The present application is pre-punched, reduces the resistance of needle, is beneficial to needle punching needle belt in more needle punching fiber bundle, improves interlayer connection performance, while reducing needle punching needle for base cloth damage, improves the in-plane tensile property of fabric;Residual short fiber is cleaned by negative pressure suction head, and the in-plane of the needle punching fabric prepared is free of residual short fiber, improves the in-plane performance of fabric.

Description

Technical Field

[0001] This invention belongs to the field of needle-punched preform technology, and specifically relates to a fine needle-punched fabric, a weaving method, and its application. Background Technology

[0002] Three-dimensional needle-punched composite materials overcome the problem of easy delamination between laminates and are increasingly being used in high-end fields such as aerospace, rail transportation, new energy, and national defense. Researchers have proposed a variety of three-dimensional needle-punched fabric structures, including mesh / mesh laminated needle-punched fabric structures, mesh / unidirectional fabric laminated needle-punched fabric structures, and mesh / woven fabric laminated needle-punched fabric structures.

[0003] The needle-punched fabric structures mentioned above all include a web layer, and the bulk density of the fabric is usually low. Increasing the needle-punching density can increase the bulk density of the fabric, but it will also aggravate the damage of the needles to the base fabric, resulting in a decrease in the in-plane tensile properties of the fabric.

[0004] To further improve the performance of needled fabrics and their composites, the literature "Significantly improve the interlayer and in-plane properties of needled fabrics by novel none-feltneedling technology" proposes a non-woven needledling technology based on half-cut fabric, which can simultaneously improve the bulk density, interlayer bonding performance, and in-plane tensile properties of needled fabrics. However, despite using half-cut fabric, the non-woven needledling technology based on half-cut fabric still contains a relatively large number of short fibers in the fabric's in-plane structure, and the presence of short fibers reduces the mechanical properties of the fabric and its composites. Currently, there are no research reports on high-performance, fine-density needled fabrics and their composites without in-plane short fibers, which warrants further investigation. Summary of the Invention

[0005] This invention provides a fine needle-punched fabric, a weaving method, and its application to solve the technical problems existing in the prior art. The needle-punched fabric has no residual short fibers in the in-plane, which improves the in-plane properties of the needle-punched fabric.

[0006] This invention includes the following technical solutions:

[0007] A method for weaving fine needle-punched fabrics includes the following steps:

[0008] Step 1: Material preparation: Cut the spread fabric into the base fabric material of the required specifications and shapes for needle punching;

[0009] Step 2, laying the base fabric: lay the cut and stretched fabric on the needle punching platform according to the designed laying direction and number of layers;

[0010] Step 3, Needle point positioning: The robot drives the needle mold to the target needle point position;

[0011] Step 4: Drilling pre-drilled holes: Insert the pre-drilled hole needle into the plywood along the guide hole of the needle punching die. After reaching the target depth, pull out the pre-drilled hole needle to form a pre-drilled hole.

[0012] Step 5: Feeding the yarn: The carbon fiber yarn is introduced into the guide needle tube, and then the guide needle tube is sent into the needle punching die, thereby introducing the carbon fiber yarn into the needle punching die.

[0013] Step 6: Cut the yarn: Clamp one end of the carbon fiber yarn and then pull out the guide needle tube; cut the carbon fiber yarn introduced into the needle punching die. The length of the cut carbon fiber yarn is twice the thickness of the needle punched fabric.

[0014] Step 7, Needle insertion: Insert the needle along the guide hole of the needle punching mold. The hook teeth of the needle punch hook the short fibers in the needle punching mold and introduce the fiber bundle into the pre-made hole to form a needle-punched fiber bundle.

[0015] Step 8: Cleaning residual short fibers: Use a negative pressure suction head to remove the short fibers remaining in the needle punch mold. This can prevent the residual short fibers from clogging the needle punch mold and hindering the next operation.

[0016] Step 9: The robot drives the needle-punching mold to the next target needle-punching point.

[0017] Step 10: Repeat steps 4 through 9 until all needle points are needled, completing the fine needle-punched fabric forming process.

[0018] Furthermore, the pre-made hole needle is a smooth-surfaced pointed needle.

[0019] Furthermore, the acupuncture needle is a triangular needle or a forked needle.

[0020] Furthermore, the spread fabric is an ultra-thin carbon fiber spread fabric.

[0021] Furthermore, the needle punch mold is provided with an auxiliary through hole that is perpendicular to the guide hole.

[0022] Furthermore, the guide needle is horizontally inserted into the auxiliary through hole to introduce the carbon fiber yarn.

[0023] Furthermore, one end of the carbon fiber yarn is left outside the auxiliary through hole for easy clamping, and the other end is cut with scissors.

[0024] Furthermore, the negative pressure suction head cleans the inside of the needle-punching mold from one end of the auxiliary through hole.

[0025] A fine needle-punched fabric includes a plywood and needle-punched fiber bundles, wherein the needle-punched fiber bundles are introduced into the thickness direction of the plywood, and the fine needle-punched fabric is produced using the above-described weaving method for fine needle-punched fabric.

[0026] An application of a fine needle-punched fabric involves combining the fine needle-punched fabric obtained by the above weaving method with an 86 epoxy resin matrix using an RTM molding process to obtain a structural and functional integrated composite material with excellent mechanical, thermoelectric, and electrical properties.

[0027] The advantages and positive effects of this invention are as follows:

[0028] 1. The present invention adopts a pre-drilling process before needle punching, which reduces needle resistance, facilitates the needle punching to bring in more needled fiber bundles, improves interlayer bonding performance, and at the same time reduces the damage of needle punching to the base fabric, thereby improving the in-plane tensile properties of the fabric.

[0029] 2. This invention uses needles to directly needle chopped yarns to form needled fiber bundles. Due to the high yarn density, the needles can hook more chopped yarns and bring them into the thickness direction to form Z-direction needled fiber bundles. The fiber introduction efficiency is high, and the interlayer performance of the needled fabric is greatly improved.

[0030] 3. In this invention, after the short fibers are introduced by needle punching, the residual short fibers are cleaned by a negative pressure suction head, which avoids the residual short fibers blocking the needle punching die and hindering the next operation; the resulting needle-punched fabric has no residual short fibers in the in-plane, which improves the in-plane performance of the needle-punched fabric.

[0031] 4. The present invention uses ultra-thin carbon fiber spread fabric as the base fabric, which can reduce the gaps between layers and help improve the bulk density of needle-punched fabrics. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the fine needle-punched fabric of the present invention;

[0033] Figure 2 This is a schematic diagram of the carbon fiber spreader fabric used for layup according to the present invention;

[0034] Figure 3 This is a schematic diagram of the acupuncture point distribution of the present invention;

[0035] Figure 4 yes Figure 3 A longitudinal cross-sectional schematic diagram;

[0036] Figure 5 This is a process flow diagram of the present invention;

[0037] In the figure, 1. Needle-punched fiber bundle; 2. Carbon fiber spread fabric; 3. Needle-punching point location; 4. Pre-made hole needle; 5. Layup fiber fabric; 6. Needle-punching mold; 601-Guide hole; 602-Auxiliary through hole; 7. Guide needle tube; 8. Carbon fiber yarn; 9. Needle-punching needle. Detailed Implementation

[0038] To further disclose the invention's content, features, and effects, the following examples are provided and described in detail with reference to the accompanying drawings.

[0039] See appendix Figure 1-5 A method for preparing a finely needle-punched fabric includes the following steps:

[0040] Step 1: Material preparation: Use a cutting table to cut the ultra-thin carbon fiber spread fabric 2 into the base fabric material of the required specifications and shapes for needle punching.

[0041] Step 2, base fabric laying: Lay the cut carbon fiber spread fabric 2 on the needle punching platform according to the designed laying direction and number of layers;

[0042] Step 3, Needle point positioning: The robot drives the needle mold 6 to the target needle point position; the needle mold 6 is provided with an auxiliary through hole 602 that is perpendicular to the guide hole 601;

[0043] Step 4: Drilling pre-drilled holes: The pre-drilled hole needle 4 is manually held and inserted into the layered fiber cloth 5 along the guide hole 601 of the needle punching mold 6. After reaching the target depth, the pre-drilled hole needle 4 is pulled out to form a pre-drilled hole; the pre-drilled hole needle 4 is a smooth pointed needle.

[0044] Step 5: Introduce the yarn: Introduce the carbon fiber yarn 8 into the guide needle tube 7, and then insert the guide needle tube 7 into the needle punching mold 6, thereby introducing the yarn into the needle punching mold 6; The guide needle tube 7 is horizontally inserted into the auxiliary through hole 602 to introduce the carbon fiber yarn 8.

[0045] Step 6: Cut the yarn: Leave one end of the carbon fiber yarn 8 outside the auxiliary through hole 602 for easy clamping, and then pull out the guide needle tube 7; use scissors to cut the other end of the carbon fiber yarn 8. The length of the cut carbon fiber yarn 8 is twice the thickness of the needle-punched fabric.

[0046] Step 7, Needle insertion: Insert the needle 9 along the guide hole 601 of the needle mold 6. The hook teeth of the needle 9 hook the short fibers in the needle mold 6 and introduce the fiber bundle into the pre-made hole to form the needle fiber bundle 1. The needle 9 is a triangular needle or a forked needle.

[0047] Step 8: Cleaning residual short fibers: Use a negative pressure suction head to remove the short fibers remaining in the mold hole, which can prevent the residual short fibers from clogging the needle punch mold 6 and hindering the next operation;

[0048] Step 9: The robot drives the needle-punching mold 6 to the next target needle-punching point position;

[0049] Step 10: Repeat steps 4 through 9 until all needle points are needled, completing the fine needle-punched fabric forming process.

[0050] A fine needle-punched fabric includes a plywood 5 and a needle-punched fiber bundle 1, wherein the needle-punched fiber bundle 1 is introduced into the thickness direction of the plywood 5, and the fine needle-punched fabric is produced by the above-described weaving method for fine needle-punched fabric.

[0051] An application of a fine needle-punched fabric involves combining the fine needle-punched fabric obtained by the above weaving method with an 86 epoxy resin matrix using an RTM molding process to obtain a structural and functional integrated composite material with excellent mechanical, thermoelectric, and electrical properties.

[0052] Example 1: A high-performance carbon fiber fine-density needle-punched fabric with a thickness of 4 mm. The needle-punched preform consists of 50 layers of carbon fiber spread fabric 2; the areal density of carbon fiber spread fabric 2 is 80 g / m². 2 The structure is a plain weave; the diameter of the pre-made perforated needles 4 is 1.8 mm, the carbon fiber yarn 8 is 9K, the needle spacing is 3 mm * 3 mm, and the needles 9 are triangular needles. The needle-punched fabric is obtained by following the above-described steps one to ten.

[0053] Example 2: A high-performance carbon fiber fine-density needle-punched fabric with a thickness of 4 mm. The needle-punched preform consists of 50 layers of carbon fiber spread fabric 2; the areal density of the carbon fiber spread fabric 2 is 80 g / m². 2 The structure is a plain weave; the diameter of the pre-made perforated needles 4 is 1.6 mm, the carbon fiber yarn 8 is 12K, the needle spacing is 3 mm * 3 mm, and the needles 9 are triangular needles. The needle-punched fabric is obtained by following the above-described steps one to ten.

[0054] Example 3: A high-performance carbon fiber fine-density needle-punched fabric with a thickness of 4 mm. The needle-punched preform consists of 50 layers of carbon fiber spread fabric 2; the areal density of the carbon fiber spread fabric 2 is 80 g / m². 2 The structure is a plain weave; the diameter of the pre-made perforated needles 4 is 1.6 mm, the carbon fiber yarn 8 is 9K, the needle spacing is 2 mm * 3 mm, and the needles 9 are triangular needles. The needle-punched fabric is obtained by following the above-described steps one to ten.

[0055] Comparative Example: A carbon fiber spread fabric laminate with a thickness of 4 mm. The laminate consists of 50 layers of carbon fiber spread fabric 2; the areal density of carbon fiber spread fabric 2 is 80 g / m².2 The structure is plain weave.

[0056] The needle-punched fabric is prepared according to the following steps: First, when cutting the ultra-thin carbon fiber spread fabric 2, the edges of the cutting area are sealed with tape. Then, it is cut to the required size, and the cut carbon fabric is aligned and laid layer by layer. 50 layers are laid in one unit layer, and then 5 layers of the laid-up fiber fabric are combined to obtain the comparative fabric.

[0057] The needle-punched fabric was composited with 86 epoxy resin, and the Type I interlaminar fracture toughness and Type II interlaminar shear strength were tested according to GB / T28891-2012 and GB / T 1450.1-2005 test standards, as shown in Table 1.

[0058] Table 1

[0059]

[0060]

[0061] As can be seen from Table 1, compared with the comparative example, the type I fracture toughness G of Example 1 is... Ⅰc The type I fracture toughness G of Example 2 was increased by 702.58%, and the type II interlaminar shear strength was increased by 150.56%. Ⅰc The type I fracture toughness G of Example 3 increased by 541.38%, and the type II interlaminar shear strength increased by 106.76%; Ⅰc It increased by 504.25%, and the type II interlaminar shear strength increased by 93.24%.

[0062] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of the present invention, can make many other modifications without departing from the spirit and scope of the claims. These modifications all fall within the scope of protection of the present invention.

Claims

1. A method for weaving finely needle-punched fabrics, characterized in that, Includes the following steps: Step 1: Material preparation: Cut the spread fabric into the base fabric material of the required specifications and shapes for needle punching; Step 2, laying the base fabric: lay the cut and stretched fabric on the needle punching platform according to the designed laying direction and number of layers; Step 3, Needle point positioning: The robot drives the needle mold to the target needle point position; Step 4: Drilling pre-drilled holes: Insert the pre-drilled hole needle into the plywood along the guide hole of the needle punching die. After reaching the target depth, pull out the pre-drilled hole needle to form a pre-drilled hole. Step 5: Feeding the yarn: The carbon fiber yarn is introduced into the guide needle tube, and then the guide needle tube is sent into the needle punching die, thereby introducing the carbon fiber yarn into the needle punching die. Step 6: Cut the yarn: Clamp one end of the carbon fiber yarn and then pull out the guide needle tube; cut the carbon fiber yarn introduced into the needle punching die. The length of the cut carbon fiber yarn is twice the thickness of the needle punched fabric. Step 7, Needle insertion: Insert the needle along the guide hole of the needle punching mold. The hook teeth of the needle punch hook the short fibers in the needle punching mold and introduce the fiber bundle into the pre-made hole to form a needle-punched fiber bundle. Step 8: Cleaning residual short fibers: Use a negative pressure suction head to remove the short fibers remaining in the needle punch mold. This can prevent the residual short fibers from clogging the needle punch mold and hindering the next operation. Step 9: The robot drives the needle-punching mold to the next target needle-punching point. Step 10: Repeat steps 4 to 9 until all needle-punching points are needle-punched, thus completing the fine needle-punched fabric forming process; the needle-punching mold is provided with auxiliary through holes that are perpendicular to the guide holes.

2. The method for weaving a finely needle-punched fabric according to claim 1, characterized in that: The pre-made hole needle is a smooth, pointed needle.

3. The method for weaving a finely needle-punched fabric according to claim 1, characterized in that: The acupuncture needle is a triangular needle or a forked needle.

4. The method for weaving a finely needle-punched fabric according to claim 1, characterized in that: The spread fabric is an ultra-thin carbon fiber spread fabric.

5. The method for weaving a finely needle-punched fabric according to claim 1, characterized in that: The guide needle is inserted horizontally into the auxiliary through hole to introduce the carbon fiber yarn.

6. The method for weaving a finely needle-punched fabric according to claim 1, characterized in that: One end of the carbon fiber yarn is left outside the auxiliary through hole for easy clamping, and the other end is cut with scissors.

7. The method for weaving a finely needle-punched fabric according to claim 1, characterized in that: The negative pressure suction head cleans the inside of the needle-punching mold from one end of the auxiliary through hole.

8. A finely needle-punched fabric, characterized in that: The fabric includes a carbon fiber spread layer and needle-punched fiber bundles, wherein the needle-punched fiber bundles are introduced into the thickness direction of the carbon fiber spread layer, and the fine needle-punched fabric is produced using the weaving method of the fine needle-punched fabric as described in any one of claims 1-7.

9. An application of finely needle-punched fabric, characterized in that: The fine needle-punched fabric obtained by the weaving method of the fine needle-punched fabric as described in any one of claims 1-7 is combined with an 86 epoxy resin matrix using an RTM molding process to obtain a structural and functional integrated composite material.

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