阅读说明：本技术 一种复合材料3d打印平台及其打印方法 (Composite material 3D printing platform and printing method thereof ) 是由 彭勇 程平 陈璇臻 汪馗 姚松 王世明 于 2021-06-21 设计创作，主要内容包括：本发明公开一种复合材料3D打印平台及其打印方法,包括下平台、上平台、高度调节器和分级平台单元,上平台安装在下平台的上方,上平台上设置有可容纳多个分级平台单元的上平台通孔,高度调节器的底部安装在下平台上,顶部的伸缩端与分级平台单元连接。本发明的复合材料3D打印平台通过控制上平台和分级平台单元形成成型平面后,可打印简单结构件；而在调节上平台及分级平台单元的上下位置形成分级结构后,可打印桁架等复杂结构,从而使打印平台具有通用性,扩大了应用范围。(The invention discloses a composite material 3D printing platform and a printing method thereof. The composite material 3D printing platform can print a simple structural part after the upper platform and the grading platform unit are controlled to form a forming plane; after the upper platform and the lower platform unit are adjusted to form the hierarchical structure, the truss and other complex structures can be printed, so that the printing platform has universality and the application range is expanded.)

1. The utility model provides a combined material 3D print platform, its characterized in that, includes platform (1), upper mounting plate (2), altitude controller (3) and hierarchical platform unit (4) down, upper mounting plate (2) are installed platform (1)'s top down, it can hold a plurality ofly to be provided with on upper mounting plate (2) upper mounting plate through-hole (21) of hierarchical platform unit (4), the bottom of altitude controller (3) is installed under on platform (1), the flexible end at top with hierarchical platform unit (4) and upper mounting plate (2) are connected.

2. Composite 3D printing platform according to claim 1, characterized in that the staging platform unit (4) is arranged to be driven by the height adjuster (3) to seal the upper platform through-hole (21) and form a molding plane with the upper side of the upper platform (2).

3. The composite 3D printing platform according to claim 1, wherein the height adjuster (3) comprises a first sub-height adjuster (31) and a second sub-height adjuster (32) which are sleeved with each other, the second sub-height adjuster (32) is mounted on the lower platform (1), the top of the first sub-height adjuster (31) is connected with the grading platform unit (4), and scales (33) for displaying height are arranged on the outer side of the first sub-height adjuster (31).

4. The composite 3D printing platform according to claim 3, wherein a threaded hole is provided in the second sub-height adjuster (32), and wherein an external thread on the first sub-height adjuster (31) is in threaded connection with the threaded hole.

5. The composite 3D printing platform according to claim 3, wherein the second sub-height adjuster (32) is a cylinder body of a hydraulic cylinder, and the first sub-height adjuster (31) is a piston rod of the hydraulic cylinder, and the piston rod is in sliding contact with the cylinder body.

6. Composite 3D printing platform according to claim 1, characterized in that the bottom of the staging platform unit (4) is provided with heating means for achieving zoned local heating.

7. Composite 3D printing platform according to claim 6, characterized in that said heating means are heating blades (6) with wires (5).

8. A 3D printing method comprising the composite 3D printing platform of any one of claims 1 to 7, comprising the steps of:

s1, setting the 3D printing platform to an initial position for forming the molding plane, checking whether each part works normally, starting the 3D printing equipment, and importing a path source code of the structure to be printed (8);

s2, adjusting the upper and lower positions of the upper platform (2) and the grading platform unit (4) through the height adjuster (4) according to the shape of the structure to be printed (8), and realizing the establishment of the printing platform of the structure to be printed (8);

s3, controlling the 3D printing equipment to start printing, and controlling the temperature of the grading platform unit (4) by adjusting heating components according to different printing path states to realize the adjustment of the partition solidification and melting states;

and S4, after printing is finished, closing the heating component, and finally curing and molding the structural member.

9. The 3D printing method according to claim 8, wherein the structure to be printed (8) comprises a prismoid truss structure (81), a pyramid truss structure (82) and a hemispherical structure (83) using a continuous fiber reinforced composite material.

Technical Field

The invention relates to the field of composite material additive manufacturing, in particular to a composite material 3D printing platform and a 3D printing method thereof for manufacturing complex structures such as continuous fiber reinforced composite material trusses.

Background

The 3D printing technology is a rapid prototyping technology, and has been rapidly developed in recent years due to its advantages of high precision, low cost, high efficiency, and the like. The 3D printing technology mainly comprises fused deposition rapid prototyping (FDM), photocuring prototyping and selective laser sintering. Research shows that compared with injection molding samples, the material has the characteristics of reduced strength, impact resistance and the like after being printed by FDM, and the fiber reinforced composite material is prepared by using fibers as a composite material reinforcement and matching with FDM printing base materials, so that the material has the characteristics of high specific strength, high specific rigidity, fatigue resistance, corrosion resistance and the like. Therefore, the 3D technology of the continuous fiber reinforced composite material is widely applied to the manufacture of various members, but due to the characteristic of layer-by-layer stacking manufacture, the printing of complex structural members such as trusses is currently difficult to realize. In order to expand the technical scope of 3D printing of continuous fiber reinforced composite structures, the problem of additive manufacturing of truss and other complex structures is urgently needed to be solved.

At present, the application of complex structures such as a truss and the like is very wide, for example, the complex structures are used as core materials of lattice structures and the filling of energy absorption tubes, but the traditional manufacturing process has the defects of high cost, long production period and the like. The research of the literature finds that the 3D printing of the lattice truss structure is realized by adopting the microwave real-time curing technology, but the manufacturing sample piece has a single structure, the efficiency is low, and the equipment modification cost is high, so that the use of the technology is limited. Therefore, in order to realize the additive manufacturing of the complex structures such as the truss, a new technology is needed to ensure higher production efficiency and lower cost while realizing the manufacturing of the complex structures.

Disclosure of Invention

The invention aims to provide a composite material 3D printing platform and a 3D printing method thereof, so that the problems are solved.

In order to achieve the purpose, the invention firstly discloses a composite material 3D printing platform which comprises a lower platform, an upper platform, a height adjuster and a grading platform unit, wherein the upper platform is arranged above the lower platform, an upper platform through hole capable of accommodating a plurality of grading platform units is formed in the upper platform, the bottom of the height adjuster is arranged on the lower platform, and a telescopic end at the top is connected with the grading platform unit and the upper platform.

Further, the grading platform unit is arranged to seal the upper platform through hole and form a molding plane with the upper side of the upper platform by being driven by the height adjuster.

Furthermore, the height adjuster comprises a first sub-height adjuster and a second sub-height adjuster which are mutually sleeved, the second sub-height adjuster is installed on the lower platform, the top of the first sub-height adjuster is connected with the grading platform unit, and scales used for displaying height are arranged on the outer side of the first sub-height adjuster.

Furthermore, a threaded hole is formed in the second sub-height adjuster, and an external thread on the first sub-height adjuster is in threaded connection with the threaded hole.

Further, the second sub-height adjuster is a cylinder body of a hydraulic oil cylinder, the first sub-height adjuster is a piston rod of the hydraulic oil cylinder, and the piston rod is in sliding connection with the cylinder body.

Further, a heating component for realizing regional local heating is arranged at the bottom of the grading platform unit.

Further, the heating part is a heating sheet with a lead.

The invention then discloses a 3D printing method, which comprises the composite material 3D printing platform of any scheme, and comprises the following steps:

s1, setting the 3D printing platform to an initial position for forming the molding plane, checking whether each part works normally, starting the 3D printing equipment, and importing a path source code of a structure to be printed;

s2, adjusting the upper and lower positions of the upper platform and the grading platform unit through the height adjuster according to the shape of the structure to be printed, and realizing the establishment of the printing platform of the structure to be printed;

s3, controlling the 3D printing equipment to start printing, and controlling the temperature of the grading platform unit through different adjusting heating components of the printing path state to realize the adjustment of the partition solidification and melting state;

and S4, after printing is finished, closing the heating component, and finally curing and molding the structural member.

Further, in step S1, a glue for adhering the structure to be printed is coated on the molding plane.

Further, the structure to be printed comprises a frustum truss structure, a pyramid truss structure and a hemisphere structure which are made of continuous fiber reinforced composite materials.

Compared with the prior art, the invention has the advantages that:

1. the composite material 3D printing platform can print a simple structural part after the upper platform and the grading platform unit are controlled to form a forming plane; after the upper platform and the lower platform unit are adjusted to form a hierarchical structure, the complex structures such as a truss can be printed, so that the printing platform has universality and the application range is expanded;

2. the printing platform adopts upper platform grading control, the platform grade number can be called according to the shape and the size of a structural member, the initial shape of a complex structure is highlighted, and the design of the grading platform also provides possibility for 3D printing of various continuous fiber reinforced composite materials with complex structures;

3. the design of the heating plate realizes local temperature control, improves the molding quality of the structural member and ensures the molding dimensional precision;

4. the device has simple structure and low cost, breaks through the limitation of the traditional manufacturing process, improves the manufacturing efficiency of the continuous fiber reinforced composite material complex structural member and reduces the manufacturing cost;

5. the invention can realize the manufacture of complex structures such as continuous fiber reinforced composite material trusses and the like, and the mechanical property of the printed complex structural member is effectively improved by adding the continuous fiber.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic axial structure diagram of a composite material 3D printing platform disclosed in an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a manufacturing process of a composite 3D printing platform according to an embodiment of the present invention;

FIG. 3 is a schematic view of a first axis of attachment of a height adjuster staging platform unit according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a second axis of attachment of the disclosed height adjuster staging platform unit in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a frustum truss structure on a theoretical composite 3D printing platform according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a theoretical printed pyramid truss structure disclosed in an embodiment of the present invention;

FIG. 7 is a schematic diagram of a theoretical printed hemisphere structure as disclosed in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an actual printed pyramid truss structure according to an embodiment of the present invention.

Illustration of the drawings:

1. a lower platform; 2. an upper platform; 21. an upper platform through hole; 3. a height adjuster; 31. a first sub-height adjuster; 32. a second sub-height adjuster; 33. calibration; 4. a staging platform unit; 5. a wire; 6. a heating plate; 8. a structure to be printed; 81. a prismatic table truss structure; 82. a pyramid truss structure; 83. a hemispherical structure; 9. an actual pyramid truss structure; 91. continuous carbon fibers; 92. a nylon matrix.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1-8, the invention firstly discloses a composite material 3D printing platform, comprising a lower platform 1, an upper platform 2, a plurality of height adjusters 3 and a plurality of grading platform units 4, wherein the height adjusters 3 are arranged corresponding to the grading platform units 4 one by one, the lower platform 1 is fixedly arranged, the upper platform 2 is arranged above the lower platform 1, the upper platform 2 is provided with upper platform through holes 21 capable of accommodating the grading platform units 4, the bottom of the height adjusters 3 is arranged on the lower platform 1, the telescopic end at the top is connected with the grading platform unit 4 or the upper platform 2, so that the staging platform unit 4 is driven by the height adjuster 3 to move up and down relative to the upper platform through-hole 21, thus, a multi-stage platform structure or a platform-like structure in which the hierarchical platform units 4 are uneven can be formed on the upper platform 2, thereby facilitating the manufacture of complex structures such as trusses. Further, the classification platform unit 4 is set to be driven by the height adjuster 3 to seal the upper platform through hole 21 and form a molding plane with the upper side of the upper platform 2, that is, the upper side of the classification platform unit 4 is flush with the upper side of the upper platform 2, so that the current commercial flat platform structure can be maintained when a simple structural member is printed, and the device has universality.

In this embodiment, the height adjuster 3 includes a first sub-height adjuster 31 and a second sub-height adjuster 32 that are sleeved to each other, the second sub-height adjuster 32 is installed on the lower platform 1, the top of the first sub-height adjuster 31 is connected with the classification platform unit 4, and the outside of the first sub-height adjuster 31 is provided with a scale 33, so as to accurately control the height of the classification platform unit 4, and finally, the support of the printing position of the structural member is completed, wherein, in actual implementation, a threaded hole is provided in the second sub-height adjuster 32, and an external thread on the first sub-height adjuster 31 is in threaded connection with the threaded hole, and for manual control adjustment, the first sub-height adjuster 31 is controlled to extend and retract by rotating the second sub-height adjuster 32. Optionally, the second sub-height adjuster 32 is a cylinder body of a hydraulic cylinder, the first sub-height adjuster 31 is a piston rod of the hydraulic cylinder, and the piston rod is in sliding connection with the cylinder body, so as to achieve automatic control and adjustment, and certainly, the height adjuster 3 may also be selected as other telescopic adjusting mechanisms.

In this embodiment, the bottom of the classification platform unit 4 is provided with a heating component, specifically, the heating component is a heating plate 6 with a wire 5, the heating plate 6 is a resistance heating, and meanwhile, the classification platform unit 4 is also provided with a temperature sensor for detecting and controlling temperature, so that the local temperature of the partition can be accurately controlled through temperature feedback. Temperature control can be carried out according to the printing state of the structural member, if the temperature of the printing completion unit is lower, the continuous fiber reinforced composite material is solidified, and the temperature of the continuous printing position is higher, so that impregnation and fusion among fiber bundles are facilitated.

Further, the invention discloses the specific operation steps of the device as follows:

first, preparation of the operation

Set up 3D print platform to the initial position that forms the shaping plane, the coating is used for the bonding to wait to print the colloid of structure 8 on the shaping plane, prevents to wait that structure 8 from appearing sticking up the limit and debonding the problem, and the inspection is whether each part starts 3D printing apparatus after working normally, and the leading-in route source code (G-code) of waiting to print structure 8.

Second, the staging platform unit 4 forms a preliminary structure

According to the shape and the size of the structure 8 to be printed, the upper and lower positions of the upper platform 2 and the grading platform unit 4 are adjusted through the height adjuster 3, and the printing platform of the structure 8 to be printed is established.

Third, print the job

And controlling the 3D printing equipment to start printing, and adjusting the temperature of the grading platform unit 4 by adjusting the heating components according to different printing path states to realize the adjustment of the partition solidification and melting states.

Fourthly, curing and forming the structural member

And after printing is finished, closing the heating part, and finally curing and molding the structural part.

In this embodiment, the 3D printing platform can realize 3D printing and manufacturing of a truss and various complex structures, the invention lists 3D printing and manufacturing of three complex structures, as shown in fig. 5 to 8, including a frustum truss structure 81, a pyramid truss structure 82 and a hemispherical structure 83 which are all theoretical responsive structures and are made of continuous fiber reinforced composite materials, the actual printing structure can refer to an actual pyramid truss structure 9 (wherein the actual pyramid truss structure 9 includes continuous carbon fibers 91 and a nylon base 92), other similar structures can be realized by adjusting an upper platform unit, when the precision requirement is increased and the structure is further complex, the number of stages of the height adjuster 3 and the grading platform unit 4 can be increased, and the operation methods are consistent.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.