3D printing raw material and 3D printing method and 3D printing workpiece adopting same

Abstract

The invention provides a 3D printing raw material and a 3D printing method and 3D printing product adopting the same. The printing raw material comprises a plurality of block units, wherein a materialof one random block unit is a fiber reinforced thermoplastic resin material. The method comprises: S1, preparing the 3D printing raw material, which comprises: using the block units as 3D printing units, and according to slice analysis of a to-be-printed component, obtaining the block units which need to be used by each printing layer; forming the blocking units of each printing layer; and coating the surfaces of all the formed block units with an adhesive or arranging welding lines on the surfaces of all the block units; S2, according to the obtained block units of each printing layer, sequentially printing each printing layer layer by layer, and carrying out adhesion connection by the adhesive or carrying out welding connection by the welding lines among the printing layers. The invention can solve the technical problems that when a continuous fiber reinforced material is adopted to prepare the 3D printing product currently, the obtained product is poor in mechanical property and for a large product, a printing speed is low.

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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