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

Abstract

Provided is a method for manufacturing a three-dimensional object part by part and layer by layer. Energy beams perform selective scanning on corresponding powder materials layer by layer according to the cross section information, projected to powder layers, of a three-dimensional CAD model of the three-dimensional object, and the three-dimensional object is obtained finally. The method comprises the following steps that the three-dimensional object is cut into a part A and a part B, wherein the sectional area of the part A is S1, and the sectional area of the part B is S2; the part A is manufactured reversely in a layer-by-layer manufacturing mode; and the manufactured part A is put reversely, and the part B is manufactured on the section of the part A in a layer-by-layer manufacturing mode with the powder layers. The method can effectively avoid or reduce the possibility of overhung faces particularly in the manufacturing process of the metal three-dimensional object, thereby improving the precision of the three-dimensional object.

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] The powder bed additive manufacturing technology uses energy beams to selectively scan the spreading layer of the powder material, and the three-dimensional objects are finally obtained by layer-by-layer scanning and solidification accumulation. The scanning position of the energy beam is the corresponding cross-sectional part of the three-dimensional object to be manufactured in the layer. 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 the scanning of a layer is completed, a new layer of powder will be spread on the completed scanning layer, and the cross-sectional position corresponding to the new powder layer will be scanned acco...

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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