Selective-failure-based 3D (three-dimensional) printing method for preparing mold

Abstract

The invention relates to a selective-failure-based 3D (three-dimensional) printing method for preparing a mold, and belongs to the technical field of 3D printing. The method comprises the following steps of: drawing three-dimensional CAD solid models of a casting and the mold; carrying out hierarchical slicing along the Z direction to form a boundary contour line of the casting-mold of each layer of slice; carrying out full region failure on powder of the contour line and the inner side of the contour line, or carrying out the full region failure on the corresponding part of the casting or forming a series of fragments which are intersected with one another and easily stripped by using a different-angle crosshatch selective failure method; after completion of hierarchical processing, carrying out the post-treatment enhancement on the powder, and the overall consolidation on the corresponding part of the mold; carrying out the full region failure on the corresponding part of the casting or forming easily stripped fragments, and removing by exerting the appropriate external force and other methods to form the mold. The method provided by the invention has the effects and benefits that the molding speed and efficiency are greatly improved when the mold is prepared, a failure region is conveniently removed, the details of the mold are effectively protected, and the molds with high dimensional accuracy requirements and complex shapes can be prepared.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a method for realizing the digital production of casting moulds, based on the 3D printing technology. Background technique [0002] 3D printing (3D printing), a kind of rapid prototyping technology, the principle is to decompose the three-dimensional model designed by the computer into several layers of plane slices, and then superimpose the "printed" materials layer by layer according to the slice graphics, and finally "stack" into a complete object. [0003] At present, 3D printing technologies mainly include SLA, FDM, SLS, LOM, etc. [0004] Stereolithography (SLA): also known as stereolithography or stereolithography, is the earliest developed rapid prototyping technology. It uses photosensitive resin as the raw material, and controls the ultraviolet laser through the computer to scan the surface of the photosensitive resin point by point according to the information of e...

AI Technical Summary

Problems solved by technology

[0012] SLS method: It is necessary to sinter the molding area of ​​each layer, which makes the molding time longer; molded parts generally have problems such as poor dimensional accuracy and low surface finish

[0013] LOM method: The range of material selection is relatively narrow. Generally, only continuous thin materials such as paper can be used. It is difficult to improve the performance of molded parts, and it is not resistant to high temperatures. It is difficult to peel off parts with complex shapes and inner cavities.

[0014] Among the above four commonly used 3D printing technologies, SLA, PDM, and LOM are not suitable for making molds because the molding materials are not resistant to high temperatures. However, the SLS method requires full sintering of the molding area of ​​each layer, and there is a molding time. Long, low efficiency and other issues

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