Method for manufacturing three-dimensional objects part by part and layer by layer

Abstract

A method of manufacturing three-dimensional objects layer by part. According to the cross-sectional information projected on the powder layer by the three-dimensional CAD model of the three-dimensional object, the energy beam performs selective scanning on the corresponding powder material layer by layer to finally obtain the three-dimensional object. The method comprises the following steps: dividing the three-dimensional object into a part A and a part B, wherein the section area of ​​the A section is S1, and the section area of ​​the B section is S2; the A is manufactured upside down by a layer-by-layer manufacturing method; the completed A section is manufactured Put it upside down, continue to use the method of powder layer-by-layer manufacturing, and implement the manufacture of part B on the cut surface of part A. The invention can effectively avoid or reduce the generation of overhanging surfaces in the process of manufacturing especially metal three-dimensional objects, and improve the precision of the three-dimensional objects.

Description

technical field [0001] The invention relates to a method for manufacturing a three-dimensional object, in particular to a method for manufacturing a metal three-dimensional object. Background technique [0002] Powder bed additive manufacturing technology uses energy beams to selectively scan the layer of powder materials, and finally obtains a three-dimensional object through layer-by-layer scanning, solidification and accumulation. The scanning position of the energy beam is the corresponding cross-sectional part of the layer of the three-dimensional object to be manufactured. The temperature of the powder material corresponding to this part rises rapidly after the action of the energy beam, and the material is melted instantly and solidified after cooling. After one layer of scanning is completed, continue to spread a new layer of powder on the completed scanning layer, and continue to scan at the corresponding cross-section of the new powder layer according to the three-...

AI Technical Summary

Problems solved by technology

Although the selective laser melting technology can manufacture metal parts of any complex shape in principle, there are still many feature surfaces that cannot be completed well in practice, including sharp corners, especially the overhang surface structure, etc. The overhang structure makes the local shape accuracy of the three-dimensional object and dimensional accuracy cannot meet the requirements, and even the entire three-dimensional object will be scrapped

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