3d printing raw material and its 3d printing method and 3d printed parts

Abstract

The present invention provides a 3D printing raw material, its 3D printing method and a 3D printed product. The printing raw material includes a plurality of block units, wherein any block unit is made of fiber reinforced thermoplastic resin material. The method includes: step 1, preparing 3D printing raw materials, including: using block units as 3D printing units, and obtaining block units to be used for each printing layer according to slice analysis of pre-printed components; forming the block units of each printing layer; The surface of the formed block unit is coated with adhesive or the surface of the block unit is provided with welding lines; step 2, according to the obtained block unit of each printing layer, each printing layer is printed layer by layer in sequence, and the printing layer They are also bonded and connected by the adhesive or welded by the welding wire. The invention can solve the technical problems of poor mechanical properties of the obtained parts and slow printing speed for large parts when the continuous fiber reinforced material is used to prepare 3D printed parts.

Description

technical field [0001] The invention relates to the technical field of 3D molding, in particular to a 3D printing raw material, a 3D printing method and a 3D printing part. Background technique [0002] 3D printing technology is an advanced manufacturing technology integrating machinery, materials, automation, and software. It is also a low-cost, automated advanced molding method that has been given high expectations. Meet people's needs for customization and personalization. So, what is 3D printing technology? The American Society for Testing and Materials gave a definition: "A method that is diametrically opposed to the traditional material removal processing method, by adding materials, based on 3D CAD model data, usually using a layer-by-layer manufacturing method, directly manufacturing a material that is completely consistent with the corresponding mathematical model The manufacturing method of the three-dimensional physical solid model." (Feng Chunmei, Yang Jiquan, ...

AI Technical Summary

Problems solved by technology

[0003] Based on the definition of printing, it is given that the printing process is in the form of layer-by-layer slice printing and layer-by-layer superposition, especially the fused deposition method (FDM) selects linear or powdery materials, which are deposited and solidified layer by layer, with the highest speed It can reach 500mm / s. For large parts, the printing time is too long, which increases the equipment utilization time and manufacturing cost; this is not conducive to the production of large-sized parts

[0004] In addition, 3D printed parts currently have insufficient mechanical properties. The tensile strength of parts printed with pure resin is less than 100 MPa, and the tensile strength of parts printed with continuous fiber reinforced materials can be close to 800 MPa.

Although the mechanical properties of parts printed with continuous fiber reinforced materials are improved to a certain extent compared with pure resins, when printing with this material, the fiber content of the material is generally controlled below 40% v, too low fiber content Not conducive to retaining the mechanical properties of fibers

Therefore, how to improve the mechanical properties of 3D printed parts and the printing speed of large-sized parts to realize the advantages of printing technology in micro-manufacturing is a difficult point, which is also a bottleneck of printing technology at this stage

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