Selective laser melting scanning strategy

Abstract

The invention relates to the field of additive manufacturing and discloses a selective laser melting scanning strategy. The plane scanning of the selective laser melting scanning strategy comprise thefollowing area scanning including outline scanning, wherein scanning is conducted along the outer contour line of the plane; internal filling line scanning, wherein filling scanning is conducted on the inner area of the plane; upper epidermis scanning, wherein scanning is conducted on the upper epidermis area inside the contour line, and the width D1 of the upper epidermis area meets the following relationship formula of D1=ah.tan alpha; lower epidermis scanning, wherein scanning is conducted on the lower epidermis area inside the contour line, and the width D2 of the lower epidermis area meets the following relationship formula of D2=bh.tan beta. By the adoption of the selective laser melting scanning strategy, the surface of a formed piece has remarkable metallic luster, and the surfacequality is excellent; full powder metallurgy combination is achieved, and the performance of the formed piece is good; the scanning speed can be improved, and the forming efficiency is high; and especially for the overhung face of the formed piece, the step effect of the surface layer of the overhung face can be reduced, and the forming quality of the overhung face is improved.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a laser selective melting scanning strategy. Background technique [0002] Additive manufacturing, also known as 3D printing, can form complex-shaped parts with high forming precision and save materials. It has the cost advantage of forming complex objects, can provide personalized customization services, simplifies the production process, and is energy-saving and environmentally friendly during the production process. At present, it has been widely used in aerospace, biomedical, military, construction, automobile, jewelry, mold and other industries. [0003] Laser selective melting (SLM) is a kind of 3D printing technology, especially for personalized customization, integrated molding of complex structures and other applications, it can provide an ideal solution, so it has a wide range of applications in aerospace and biomedical fields prospect. However, the aerospace and...

AI Technical Summary

Problems solved by technology

However, the aerospace and biomedical fields, especially the dental field, have very high requirements on the surface quality of the parts. The surface quality of the parts formed by the SLM process cannot be compared with the cutting parts. The unreasonable setting of the process parameters leads to the surface quality of the molded parts. Rough, follow-up processing is cumbersome

Especially for the overhanging surface, its surface quality is relatively poor. Although relevant technical personnel have been working hard to explore improvement methods for this problem, they have not made good progress.

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