CN107756787B

CN107756787B - Continuous fiber reinforced composite material screw extrusion 3D printing device

Info

Publication number: CN107756787B
Application number: CN201711237115.2A
Authority: CN
Inventors: 田小永; 罗盟; 刘腾飞; 尚俊凡; 李涤尘
Original assignee: Xian Jiaotong University
Current assignee: Shenzhen collaborative innovation high tech Development Co.,Ltd.
Priority date: 2017-11-30
Filing date: 2017-11-30
Publication date: 2020-04-10
Anticipated expiration: 2037-11-30
Also published as: CN107756787A

Abstract

A continuous fiber reinforced composite material screw extrusion 3D printing device comprises a spray head, wherein the spray head is connected to the bottom of a lower sleeve, the outer side of the top of the lower sleeve is connected with a lower fixing plate, the top of the lower sleeve penetrates through the lower fixing plate and is connected with the bottom of an upper sleeve, the top of the upper sleeve is connected with an upper fixing plate, a charging barrel is arranged on the side edge of the upper fixing plate, the bottom of the charging barrel is connected with the upper sleeve through a charging barrel connecting piece, a screw rod is arranged in an inner cavity of the upper sleeve and the lower sleeve, the upper part of the screw rod is connected in the upper; according to the invention, the screw extrusion is adopted, and the original technological advantages of synchronous feeding and fiber feeding in the printing process are retained, so that the high-efficiency, high-precision and high-adaptability part for 3D printing of the continuous fiber composite material is realized.

Description

Continuous fiber reinforced composite material screw extrusion 3D printing device

Technical Field

The invention relates to the technical field of 3D printing, in particular to a continuous fiber reinforced composite material screw extrusion 3D printing device.

Background

The 3D printing technology is that a printing head is subjected to material filling manufacturing according to the section information of a current layer under program control, and then required parts are quickly manufactured through layer-by-layer accumulation.

3D printing of continuous fiber reinforced thermoplastic composite materials is taken as a newly developed high-performance printing technology, and compared with printing of short fiber and long fiber reinforced composite materials, the method has the advantages of simple printing process, short printing period, obvious improvement of part strength of a workpiece and the like, and is paid attention to in part of industrial application fields. The continuous fiber composite material has great research and application potential, so that the process barrier and difficult point analysis of the existing equipment are carried out from the aspects of improving the printing efficiency, the success rate of the finished product, the precision of the finished product and the like, and the development and research of a new device and a new process are more significant.

Most of the existing continuous fiber composite material printing is wire feeding in the printing process on the basis of combining the traditional FDM process, so that the finished piece is realized, and the following difficulties and problems still exist and are urgently needed to be overcome and solved:

the existing continuous fiber reinforced composite 3D printing equipment for wire printing still adopts remote wire feeding, so that the problems of small wire feeding force, low wire feeding speed and the like exist, and the problems of easy blockage of a spray head, low printing efficiency, poor precision and the like exist in the printing process;

secondly, the existing continuous fiber composite material printing system cannot simultaneously meet the requirement of 3D printing of various raw materials such as wires, granules, powder and the like. For example, before performing complicated-form printing processing on a raw material in the original form of powder or granules on a printing device for filament, standard filament of granular material and powder must be extruded and prepared, which greatly increases the printing period and the process difficulty, and therefore, the development of high-adaptability printing processes and devices for various raw material forms is very urgent.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a continuous fiber reinforced composite material screw extrusion 3D printing device, which can be used for realizing a high-efficiency, high-precision and high-adaptability part for 3D printing of a continuous fiber reinforced composite material.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a 3D printing device is extruded to continuous fibers reinforcing combined material screw rod, including shower nozzle 2, shower nozzle 2 is connected in sleeve 3 bottom down, the 3 top outsides of lower sleeve are connected with bottom plate 5, bottom plate 5 is passed at 3 tops of lower sleeve, connect with upper sleeve 4 bottom, upper fixed plate 6 is connected at the 4 tops of upper sleeve, be equipped with feed cylinder 8 at 6 sides of upper fixed plate, feed cylinder 8 bottom is connected with upper sleeve 4 through feed cylinder connecting piece 7, at

upper sleeve

4, 3 inner chambers of lower sleeve are equipped with

screw rod

1, 1 upper portion of screw rod is connected in upper sleeve 4 through bearing 9, the top of screw rod 1 stretches out outside upper fixed plate 6.

The upper sleeve 4 respectively with upper fixed plate 6, align through the screw hole with bottom plate 5 and bottom sleeve 3, realize relative fixed connection with the bolt, guarantee upper fixed plate upper thread clearing hole 601, upper sleeve screw rod mating holes 401, the bottom plate screw rod is through the axis coincidence in empty 501 and bottom sleeve screw rod mating holes 302 four holes, and eccentric distribution is in same one side, guarantee simultaneously that screw rod 1 is at its bearing inner connecting section 101 and bearing 9 internal diameter cooperation, the fibre of upper sleeve 4 is sent into hole 402 and bottom sleeve 3's fibre clearing hole 301 and is distributed in same one side, wherein fibre clearing hole 301 and bottom sleeve 3 and the same center pin distribution of upper sleeve 4's outer wall.

Go up sleeve 4 one side and feed cylinder connecting piece 7 realize relative fixed connection through the screw hole cooperation, feed cylinder connecting piece 7 realizes being connected with the relative fixed of feed cylinder 8 through the screw hole cooperation, guarantees that the raw materials loops through pan feeding hole 801 on the feed cylinder 8, connecting piece material passing hole 701 on the feed cylinder connecting piece 7 and last sleeve material passing hole 403 on the upper sleeve 4.

A printing method of a continuous fiber reinforced composite material screw extrusion 3D printing device comprises the following steps:

1) thermoplastic raw materials are put into a feeding hole 801 of a charging barrel 8, then sequentially pass through a connecting piece material passing hole 701 and an upper sleeve material passing hole 403 to be in contact with a screw rod 1, and are extruded and pushed under the rotation action of the screw rod 1; meanwhile, the continuous fibers sequentially pass through the fiber feeding hole 402 and the fiber passing hole 301 and are finally combined with the molten raw materials in the spray head 2;

2) the extrusion of the continuous fiber composite material is realized through the extrusion port 201, and the screw extrusion printing part of the composite material is realized under the condition that the matching system controls the movement of the printing substrate in the X, Y, Z plane.

The invention has the beneficial effects that:

aiming at the defects of small wire feeding force, low workpiece efficiency, large restriction on raw material forms and the like in the extrusion forming of the conventional continuous fiber composite material, the invention keeps the original process advantages of synchronous feeding and fiber feeding in the printing process through screw extrusion, thereby realizing the high-efficiency, high-precision and high-adaptability workpiece for 3D printing of the continuous fiber composite material, and having great influence and significance on the 3D printing of the extrusion forming material

Drawings

FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention.

Fig. 2 is a schematic exploded view of the apparatus of the present invention.

Fig. 3 is a sectional view of the upper sleeve 4.

Fig. 4 is a schematic structural view of the lower sleeve 3, wherein fig. b is a sectional view of fig. a.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1, a 3D printing device is extruded to continuous fibers reinforcing combined material screw rod, including shower nozzle 2, shower nozzle 2 is connected in lower sleeve 3 bottom, the outer side of lower sleeve 3 top is connected with bottom plate 5, lower sleeve 3 top passes bottom plate 5, and upper sleeve 4 bottom is connected, upper fixed plate 6 is connected at upper sleeve 4 top, be equipped with feed cylinder 8 at 6 side of upper fixed plate, feed cylinder 8 bottom is connected with upper sleeve 4 through feed cylinder connecting piece 7, at upper sleeve 4, the 3 inner chambers of lower sleeve are equipped with screw rod 1, screw rod 1 upper portion is connected in upper sleeve 4 through bearing 9, the top of screw rod 1 stretches out outside upper fixed plate 6.

Referring to fig. 2, 3 and 4, the upper sleeve 4 is aligned with the upper fixing plate 6, the lower fixing plate 5 and the lower sleeve 3 through threaded holes respectively, and is relatively fixedly connected by bolts, and during the connection process, it is required to ensure that the upper thread of the upper fixing plate passes through the hole 601, the screw rod matching hole 401 of the upper sleeve, and the screw rod of the lower fixing plate coincides with the central axes of the four holes of the screw rod matching hole 501 of the lower sleeve and the screw rod matching hole 302 of the lower sleeve, and the central axes are eccentrically distributed on the same side for realizing matching through the screw rod 1; when the screw rod 1 is connected, the inner bearing section 101 of the screw rod is matched with the inner diameter of the bearing 9, the fiber feeding hole 402 of the upper sleeve 4 is distributed on the same side with the fiber passing hole 301 of the lower sleeve 3, and the fiber passing hole 301 is distributed on the same central axis with the outer walls of the lower sleeve 3 and the upper sleeve 4.

Referring to fig. 1, 2 and 3, one side of the upper sleeve 4 is matched with the material cylinder connecting piece 7 through a threaded hole to realize relatively fixed connection, and the material cylinder connecting piece 7 is matched with the material cylinder 8 through a threaded hole to realize relatively fixed connection, so that raw materials can sequentially and smoothly pass through a feeding hole 801 on the material cylinder 8, a connecting piece material passing hole 701 on the material cylinder connecting piece 7 and an upper sleeve material passing hole 403 on the upper sleeve 4.

Referring to fig. 1, 2 and 4, a printing method of a continuous fiber reinforced composite screw extrusion 3D printing device includes the following steps:

Claims

1. The utility model provides a continuous fibers reinforcing combined material screw rod extrudes 3D printing device, includes shower nozzle (2), its characterized in that: the spray head (2) is connected to the bottom of the lower sleeve (3), the outer side of the top of the lower sleeve (3) is connected with the lower fixing plate (5), the top of the lower sleeve (3) penetrates through the lower fixing plate (5) and is connected with the bottom of the upper sleeve (4), the top of the upper sleeve (4) is connected with the upper fixing plate (6), a charging barrel (8) is arranged on the side edge of the upper fixing plate (6), the bottom of the charging barrel (8) is connected with the upper sleeve (4) through a charging barrel connecting piece (7), screw rods (1) are arranged in the inner cavities of the upper sleeve (4) and the lower sleeve (3), the upper parts of the screw rods (1) are connected into the upper sleeve (4) through bearings (9), and the top;

the upper sleeve (4) is respectively aligned with the upper fixing plate (6), the lower fixing plate (5) and the lower sleeve (3) through threaded holes, relative fixed connection is realized through bolts, the upper fixing plate upper thread through hole (601), the upper sleeve screw rod matching hole (401) and the lower fixing plate screw rod are enabled to coincide through central axes of four holes of a hollow hole (501) and a lower sleeve screw rod matching hole (302) and are eccentrically distributed on the same side, meanwhile, the screw rod (1) is enabled to be matched with the inner diameter of a bearing (9) in a bearing inner connecting section (101), a fiber feeding hole (402) of the upper sleeve (4) and a fiber through hole (301) of the lower sleeve (3) are distributed on the same side, and the fiber through holes (301) are distributed on the same side with the outer walls of the lower sleeve (3) and the upper sleeve (4) through central;

go up sleeve (4) one side and feed cylinder connecting piece (7) realize relative fixed connection through the screw hole cooperation, feed cylinder connecting piece (7) realize through the screw hole cooperation with the relative fixed connection of feed cylinder (8), guarantee that the raw materials loops through pan feeding hole (801) on feed cylinder (8), connecting piece material passing hole (701) on feed cylinder connecting piece (7) and last sleeve material passing hole (403) on last sleeve (4).

2. The printing method of a continuous fiber reinforced composite screw extrusion 3D printing device according to claim 1, comprising the steps of:

1) thermoplastic raw materials are put into a feeding hole (801) of a charging barrel (8), and then sequentially pass through a connecting piece material passing hole (701) and an upper sleeve material passing hole (403) to be in contact with a screw (1), and are extruded and pushed under the rotation action of the screw (1); meanwhile, continuous fibers sequentially pass through the fiber feeding hole (402) and the fiber passing hole (301) and are finally combined with molten raw materials in the spray head (2);

2) the extrusion of the continuous fiber composite material is realized through the extrusion port (201), and the screw extrusion printing part of the composite material is realized under the condition that the matching system controls the printing substrate to move in the X, Y, Z plane.