Technical method for controlling warping deformation of aluminum alloy thin-wall part in 3D printing process

Abstract

The invention relates to a technical method for controlling warping deformation of an aluminum alloy thin-wall part in the 3D printing process. By designing a novel technical support, the plane in theforming direction (Z direction) serves as a mirror face, a mirror body of a part is generated, the section of the mirror body and the part on a forming face (XOY face) forms a closed structure, the gap between the part and the mirror body is 3-5 mm and is filled with a Z-shaped sheet (the wall thickness is the same with that of the part) or a hollowed-out grid structure, the part is connected with the mirror body, a supporting structure is removed through linear cutting, and a printing part is obtained. According to the technical method, the effect that the thin-wall part is free of warping deformation in the printing process can be ensured, in addition, the support quantity is not increased, the post-processing cost is reduced, and the printing success rate and quality of the thin-wall part are improved. Thus, the technical method has the important significances to improvement of the quality and success rate of the same kind of thin-wall parts.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a process method for controlling warping and deformation of aluminum alloy thin-walled parts in the 3D printing process in the field of metal 3D printing. Background technique [0002] Selective Laser Melting (SLM) is favored by researchers in the aerospace field because of its advantages of high flexibility, rapid prototyping, and not being constrained by the complexity of the part shape. In the laser selective melting technology, the laser beam melts the metal powder spread on a specific area of ​​the powder bed layer by layer according to a specific path, and finally forms a three-dimensional part with a complex shape. Its printing principle determines that the rapidly solidified phase formed by the current printing layer must form a firm connection with the solidified phase of the previous layer, otherwise it is prone to warping and deformation, resulting in p...

AI Technical Summary

Problems solved by technology

However, for some thin-walled shells and shielding parts with a wall thickness between 1-2mm, the structure itself is an open structure in the direction of the forming surface, which is unstable and prone to deformation; it is produced after rapid heating and cooling during the printing process. Residual thermal stress accumulates layer by layer, and its edge is more prone to warping and deformation due to tensile stress, which will block the scraper and cause printing failure

The edge of the thin-walled structure is parallel to the printing direction, and it is impossible to control the deformation of thin-walled parts by adding support to some cantilever structures less than 45°.

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