Variable-size large-breadth 3D printing method and printing structure

Abstract

The invention provides a variable-size large-breadth 3D printing method and a variable-size large-breadth 3D printing structure. The printing method comprises the steps that firstly, printing powder is laid, and then a preset pattern and a closed boundary are printed on the surface of the laid powder, so that the printed pattern and the closed boundary form an integrated structure and have certain mechanical strength; then laying and printing are repeatedly conducted on the upper portion of the last-time-laid printing powder till printing of the workpiece is completed, in the laying and printing process, all the positions of the closed boundaries of every two adjacent layers of printing powder are continuous, and 3D printing is completed after a frame shell formed by combining the closed boundaries is removed and the printing powder on the surface of the workpiece is removed; the printing structure comprises a bottom plate, printing powder laid on the bottom plate, a frame shell and a printing workpiece, wherein the frame shell and the printing workpiece are formed by curing the printing powder, and the printing workpiece is located on the inner side of the frame shell. The problems that a large workpiece cannot be manufactured through conventional 3D printing and a large printing working cylinder leaks sand can be solved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a variable-size large-format 3D printing method and a printing structure. Background technique [0002] The current additive manufacturing technology mainly includes three methods. The first is to irradiate the printing powder with high-energy laser or high-energy particle beam, so that the powder at the irradiation position is fused, and finally a three-dimensional product is obtained after layer-by-layer fusion. The second is to directly spray the printing material on the substrate, and the sprayed substrate is quickly solidified under certain conditions, and then sprayed layer by layer to form a 3D printing product. The third method is to print powder layer by layer. The surface is sprayed with adhesive materials, so that the powder can be bonded according to the printing pattern, and finally form a 3D printing product through layer-by-layer bonding. [0003] A...

AI Technical Summary

Problems solved by technology

[0003] Among the above methods, there are two methods that need to print on the surface of the laid powder. In this way, the uniform laying of the powder becomes a necessary prerequisite for 3D printing. In order to allow the powder to accumulate and lay evenly, a fixed container must be provided , the bottom plate of the container is used to support the powder, and the height of the powder can be changed by moving the bottom plate of the container. As the volume increases, the container that is too large will inevitably lead to increased sealing difficulty, which is prone to problems such as sand leakage, piston jamming, and driving difficulties.

These problems have greatly increased the difficulty of large-scale 3D printing

Images