Large-format multi-laser interface scanning method based on powder bed additive manufacturing

Abstract

The technical points of the large-format multi-laser variable junction scanning method based on powder bed additive manufacturing include the following steps. In the first step, the diagonal line is rotated around the center point, and the rotation angle changes with the number of model layers. In the third step, the 3D model of the part is sliced ​​and layered according to the layer thickness parameters required by the laser selective melting additive manufacturing process. Number each layer; using this technical solution, large-scale scanning and filling are realized through multi-laser combination, and the scanning path and parameter design functions of multi-model layers are realized at the same time, which effectively solves the problem of laser selective melting and forming in the center and edge area of ​​the cylinder. The structural uniformity of the formed parts and the key technical problems such as stress and deformation ensure the structural uniformity of the formed parts in the center and edge areas of the forming cylinder.

Description

technical field [0001] The invention relates to the technical field of laser selective melting and additive manufacturing, in particular to a large-format multi-laser transition surface scanning method based on powder bed additive manufacturing. Background technique [0002] Laser selective melting additive manufacturing technology is an advanced manufacturing technology based on the idea of ​​discrete accumulation forming. It does not require molds. By discretizing the 3D model of the part into a series of orderly micron-scale thin layers along a certain direction, the high-brightness laser is used as the heat source. According to the contour information of each layer, metal powder is melted layer by layer, and parts of any complex shape are directly manufactured, only heat treatment and surface finishing parts are required; it has the characteristics of greatly reducing manufacturing processes, shortening production cycle, saving materials and funds; it is a high-end product...

AI Technical Summary

Problems solved by technology

The "waiting time" caused by the preset powder bed when processing parts with conventional laser / electron beam selective melting technology can significantly improve the forming efficiency of high-energy beam additive manufacturing, but it is aimed at deformation and stability problems during the forming process of large-sized parts , does not explain how to design large-format slice scanning method, deformation control and coordinated control of multiple f-θ focusing systems, and the coordinated control of multiple f-θ focusing systems is difficult and costly

[0005] When scanning in a large area, due to the deflection of the optical path, the difference in beam energy density between the central area and the edge area is large, and the shaping effect of the edge area is poor

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