Laser Selective Melting Scanning Method

Abstract

The invention relates to the field of additive manufacturing, and discloses a laser selective melting scanning method. In the laser selective melting scanning method, the layer scan includes the following area scans: contour scan: scan along the outer contour line of the layer; internal filling line scan: perform filling scan in the inner area of ​​the layer; upper epidermis scan: scan inside the contour line The upper epidermis area is scanned, and the width D1 of the upper epidermis area satisfies the following relationship: D1=ah·tanα, the lower epidermis scan: the lower epidermis area inside the contour line is scanned, and the width D1 of the upper epidermis area satisfies the following Relational formula: D2=bh·tanβ. Using this method, the surface of the formed part has obvious metallic luster, and the surface quality is better; the combination of powder metallurgy is sufficient, and the performance of the formed part is better; the scanning speed can also be improved, and the forming efficiency is higher, especially for the overhanging surface of the formed part. , can reduce the step effect of its surface, thereby improving its molding quality.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a laser selective melting scanning method. 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 b...

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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