3D printing method and 3D printing equipment

Abstract

The invention discloses a 3D printing method and 3D printing equipment. The 3D printing method comprises the steps that 1, when a scanning system scans a scanning section of a current layer, an image of the scanning section of the current layer is obtained; 2, whether the scanning section has buckling deformation or not is judged according to the image; 3, when the scanning section has one buckling deformation or two or more buckling deformation with the same buckling direction, a next step is executed, otherwise, the process is ended; 4, whether the at least one buckling deformation is in a cutter direction or not is judged; if yes, a fifth step is executed, otherwise, a working platform is rotated so that all buckling deformation can be in the cutter direction, and the fifth step is executed; and 5, a scraper performs powder spreading on the scanning section and performs smooth scraping along the scraper to realize powder spreading of the next layer, and the scanning system continues to complete scanning of the next layer. When buckling deformation occurs in the printing process, the printing stability, the printing quality and the printing efficiency of the equipment are ensured as much as possible.

Description

technical field [0001] The present application relates to the technical field of additive manufacturing, in particular to a 3D printing method and 3D printing equipment. Background technique [0002] Additive manufacturing technology is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. tooling mold, so the application range is very wide. Selective Laser Melting (SLM) is one of the additive manufacturing technologies that has developed rapidly in recent years. It uses powder materials as raw materials and uses laser to scan the cross-section of a three-dimensional entity layer by layer to complete prototype manufacturing. It is not affected by the shape of the part. The complexity is limited, no tooling is required, and the application range is wide. The basic process of the selective laser melting process is: the powder fee...

AI Technical Summary

Problems solved by technology

However, for parts to be printed with suspended surfaces and inclined surfaces, the printing effect is not particularly ideal, because in the process of printing suspended surfaces and small-angle surfaces, direct contact with the powder layer, the heat of the rapid cooling of the laser cannot help dissipated, resulting in excessive local heat, and at the same time conduct heat conduction along the direction of the entity such as figure 1 As shown, the cooling is fast and the temperature is low near the solid position, and the cooling is slow and the temperature is high near the powder bed. It is easy to warp during the printing process, which will affect the printing quality and printing success rate of the workpiece.

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