3D printing method for continuous fibre-reinforced thermoplastic resin matrix composite material, and printing head

A technology for strengthening thermoplastic and thermoplastic resins, applied in the direction of additive processing, processing and manufacturing, etc., can solve the problems of effective impregnation and molding speed of connecting fibers, low comprehensive performance of molded parts, and relatively large component size restrictions, so as to improve the interlayer and The effect of interface bonding performance, improving surface quality, and increasing printing efficiency

Active Publication Date: 2017-01-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to aim at the small size of connecting fibers used in the 3D printing of existing thermoplastic resin-based composite materials, and the impregnation of the connecting fibers cannot be effectively impregnated, resulting in low molding speed, large component size restrictions, and molded parts. In order to solve the problem of low comprehensive performance, a fiber tow with a large size is inv

Method used

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  • 3D printing method for continuous fibre-reinforced thermoplastic resin matrix composite material, and printing head
  • 3D printing method for continuous fibre-reinforced thermoplastic resin matrix composite material, and printing head

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as Figure 1-2 shown.

[0029] A 3D printing method for continuous fiber-reinforced thermoplastic resin-based composite materials. First, the connecting fiber bundles are pretreated to enhance the bonding force between the connecting fiber bundles and the resin matrix. Secondly, the pretreated continuous fiber bundles are mixed with the thermoplastic resin simultaneously. Pass into the melting chamber of the rotary blending 3D printing head; thirdly, make the melting chamber rotate around its central axis, and the extrusion head connected to the melting chamber can also rotate around the central axis, controlling the rotation direction of the extrusion head and the placement of the melting chamber The direction is opposite; Fourth, a stirring gear ring is set on the inner side of the melting chamber and the extrusion head, and the fiber bundle and the molten thermoplastic resin are uniformly blended under the stirring action of the two-stage counter-rotating helica...

Embodiment 2

[0044] Such as Figure 1-2 shown.

[0045] A rotary blending 3D printing head for forming continuous fiber-reinforced thermoplastic resin-based composite materials, which includes a three-way feeding chamber 1, a melting chamber 20 and an extrusion head 24, the three-way feeding chamber 1 is fixed on the upper bracket, and the three-way Both sides of feeding cavity 1 are obliquely provided with thermoplastic consumables 15 feeding pipes and feeding wheels 3, and the center of tee feeding chamber 1 is longitudinally provided with fiber tow 13 feeding pipes; tee feeding chamber 1 uses hollow slip ring 17 and first The sealed bearing 5 is connected with the melting chamber 20, and the outer wall of the melting chamber 20 is nested with a tubular heating jacket 7, and the electrodes of the tubular heating pipe are electrically connected with the pins of the hollow slip ring 17; Temperature sensors 14, 8 are installed, and the wires of the temperature sensor outside the melting ch...

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Abstract

The invention discloses a 3D printing method for a continuous fibre-reinforced thermoplastic resin matrix composite material, and a printing head. According to the method, fibre bundles and molten thermoplastic resins can be subjected to rotary blending and then subjected to rotary extrusion, and extruded wires are spiral; and the printing head is capable of charging the fibre bundles and the thermoplastic resins in a melting cavity, and spiral tooth rings are arranged at the inner sides of the melting cavity and an extrusion head, and rotate in opposite directions. The heated-molten resins and fibres are stirred by the spiral tooth rings which bidirectionally rotate after being blended, so that the fibres are compactly wound into a spiral column shape from a flat shape, the resins are uniformly distributed in each fibre orientation, and then a blend is extruded to a forming area from an extrusion port and cooled and cured to form a spatial entity. According to the method and the printing head, which are disclosed by the invention, the flat large-tow fibres can be used as reinforcements in a 3D printing process, the compactly-wound fibres have a high compaction degree, the fibres and the matrixes are adequately soaked, and the formed fibres and resins are uniformly distributed; and therefore, the method and the printing head are capable of greatly improving the mechanical property of a member, and improving the forming quality.

Description

technical field [0001] The invention relates to a molding technology of composite materials, in particular to a molding technology of thermoplastic resin composite materials reinforced by connecting fibers, in particular to a 3D printing method and printing head of continuous fiber reinforced thermoplastic resin-based composite materials. Background technique [0002] Rapid prototyping is a new type of manufacturing process that comprehensively applies computer-aided design, polymer material science, digital control and other cutting-edge technology fields. spatial geometric entities. This technology is different from the traditional subtractive manufacturing process (remove the excess material of the blank to obtain the target entity), and it has been improved into an additive manufacturing process, which makes the molding mold no longer needed in the manufacturing process, shortens the part design cycle, and can manufacture any A three-dimensional entity with a complex st...

Claims

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Application Information

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IPC IPC(8): B29C64/10B29C64/20B33Y30/00
CPCB33Y30/00
Inventor 李迎光李楠垭刘舒霆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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