Forming method of mixed-stitch composite material of three-dimensional woven prefabrication body fabric

A composite material and molding method technology, which is applied in the field of mixed-seam composite material molding, can solve problems such as low production efficiency, low viscosity, and affect the mechanical properties of composite materials, and achieve the effect of ensuring uniform glue content and reasonable resin distribution.

Active Publication Date: 2016-02-10
SHANDONG ZHONGHENG CARBON FIBER TECH DEV CO LTD
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AI Technical Summary

Problems solved by technology

This molding technology is currently a commonly used method for molding three-dimensional braided composite materials. Although the composite materials prepared by this method have high performance, the production efficiency of this technology is low, and the requirements for the resin used for molding are high. Resin Have higher fluidity and lower viscosity
In addition, there is a very critical difficulty, that is, due to the influence of factors such as resin viscosity and resin diffusion rate during the composite impregnation of resin glue and fiber fabric prefabricated body, there will inevitably appear poor glue particles inside the prefabricated fabric structure. The appearance of such a small area is likely to form micro-defects and affect the overall mechanical properties of the composite material.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Forming method of mixed-stitch composite material of three-dimensional woven prefabrication body fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, 3K carbon fiber filaments are selected as the reinforcing fiber 1 as the weaving raw material of the three-dimensional structure prefabricated body, the polyethylene film is selected as the resin film 3 and the polyethylene fiber filament is selected as the resin fiber 2 . Carbon fiber filaments and polyethylene fiber filaments are mixed and wound and assembled into the spindle of the weaving machine. The mixing ratio of polyethylene fibers accounts for 10% of the total weight of the three-dimensional composite material, and the three-dimensional four-way weaving method is used to weave a cylindrical fabric structure. The total thickness of the braiding is preset to be 20mm, among which four thickness positions of 2mm, 6mm, 10mm, and 14mm are needle-punched along the thickness plane direction of the cylinder to lay a narrow strip of polyethylene film with a thickness of 0.8mm, where the width of the narrow strip is 0.5 mm, the total weight of ...

Embodiment 2

[0037]The reinforcing fiber is 6K carbon fiber filament as the weaving raw material of the three-dimensional structure prefabricated body, the resin film is selected as the polyurethane film and the resin fiber is the polyurethane fiber filament. Carbon fiber filaments and polyurethane fiber filaments are mixed and wound and assembled into the spindle of the weaving machine. The mixing ratio of polyethylene fibers accounts for 8% of the total weight of the three-dimensional composite material, and the three-dimensional five-way weaving method is used to weave a cylindrical fabric structure. The total thickness of weaving is preset to be 10mm, among which four thickness positions of 2mm, 4mm, 6mm, and 8mm are needle-punched along the thickness plane direction of the cylinder to lay a narrow strip of polyurethane film with a thickness of 0.6mm, and the width of the narrow strip is 0.4mm , the total weight of the adhesive film accounts for 10% of the total weight of the three-dime...

Embodiment 3

[0040] The reinforcing fiber is 6K silicon carbide fiber filament as the weaving raw material of the three-dimensional structure prefabricated body, the resin film is polypropylene film and the resin fiber is polypropylene fiber filament. Silicon carbide filaments and polypropylene fiber filaments are mixed and wound and assembled into the spindle of the weaving machine. The mixing ratio of polyethylene fibers accounts for 6% of the total weight of the three-dimensional composite material, and the three-dimensional six-directional weaving method is used to weave into a square tube fabric structure. The total thickness of weaving is preset to be 15mm, among which four thickness positions of 3mm, 6mm, 9mm, and 12mm are needle-punched along the thickness plane direction of the square tube to lay a narrow strip of polypropylene film with a thickness of 0.5mm, and the width of the narrow strip is 0.3 mm, the total weight of the adhesive film accounts for 18% of the total weight of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a forming method of a mixed-stitch composite material of three-dimensional woven prefabrication body fabric. The method comprises the following steps that thermoplastic resin fibers and reinforced fibers are premixed or reinforced fibers attached with thermosetting resin films and reinforced fibers are premixed, so that resin and the reinforced fibers are subjected to synchronous mixed stitch knitting; during stitch knitting, resin adhesive films are laid in the set portion of the fabric in a needling mode; after stitch knitting is finished, the set portion of an obtained three-dimensional woven prefabrication body is subjected to three-dimensional stitch laying through stitch laying resin fibers; the resin content of the set portion is increased, and the obtained three-dimensional woven prefabrication body fabric is subjected to vacuum mould pressing linkage forming. By the adoption of combined application of the above three technologies, the forming method can adapt to a traditional composite material hot press molding process, the prepared fiber composite prefabrication body fabric can be used for forming machining of the composite material directly through a hot press molding mold, the gas tightness in a vacuum infusion RTM process is achieved, and the production efficiency is effectively improved.

Description

technical field [0001] The present invention relates to a composite material molding method for a three-dimensional braided prefabricated fabric, in particular to a composite material molding method for a three-dimensional braided prefabricated body that uses resin film needle-punched layup, resin fiber mixed weaving and seam-laying technology combined application method, using this method can effectively replace the traditional RTM molding technology of three-dimensional braided composite materials, and improve the molding efficiency. Background technique [0002] Three-dimensional braided composite material is a high-performance composite material similar to homogeneous materials that uses three-dimensional prefabricated fabric structures and high-performance resins. Compared with traditional two-dimensional laminated composite materials, three-dimensional braided composite materials have no interlayer structure. The characteristics of strength weakening. In the prefabrica...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/48
CPCB29C70/48
Inventor 朱波曹伟伟蔡珣乔琨王永伟关勇
Owner SHANDONG ZHONGHENG CARBON FIBER TECH DEV CO LTD
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