Material additive manufacturing device and method of high-degree-of-freedom complex structural part

Abstract

The invention belongs to the field of material additive manufacturing and provides a material additive manufacturing auxiliary method and device. The method comprises the steps of designing and optimizing the structure of a part to generate a corresponding three-dimensional entity model; establishing an appropriate three-dimensional special orientation supporting structure according to the part structure and shape of the part; machining raw material powder layer by layer to form a compact entity according to set machining parameters with the part and the three-dimensional spatial orientation supporting structure as objects to be machined and obtaining a combination composed of the three-dimensional spatial orientation supporting structure and the part; and removing the three-dimensional spatial orientation supporting structure on the combination to obtain the part. The invention further provides the three-dimensional spatial orientation supporting structure with the extensive applicability. Through the novel method and device provided for manufacturing the high-degree-of-freedom complex structural part at low cost, high efficiency and high quality, traditional material and processlimitation is broken through, and existing technical problems are solved.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and specifically relates to an additive manufacturing device and method for high-degree-of-freedom complex structural parts. It has a wide range of applications, especially for SMA (the full English name is Shape Memory Alloy, referred to as SMA). Background technique [0002] The essence of part manufacturing is actually to accurately transfer the designed geometric dimensions to the physical workpiece through the forming equipment. With the development of science and technology, precision manufacturing fields such as aerospace and automobiles have put forward higher requirements for the structural shape, dimensional accuracy, forming quality and efficiency of parts. [0003] Parts with simple structural shapes are easy to form, have stable performance, and the manufacturing process has become increasingly mature. However, due to their simple structure and low degree of freedom, the practi...

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Problems solved by technology

[0006] At present, there are still some problems in processing high-degree-of-freedom complex structural parts with this technology. Distortion, cracking or forming failures occur from time to time. Therefore, it is necessary to add some auxiliary support structures at the same time to ensure the smooth forming of parts.

[0007] Currently commonly used support forms, such as the lower tree support, lower grid support and lower solid support described in the patent application with the publication number CN107685148A, mostly grow vertically or obliquely from the substrate; when the parts to be processed When the suspended part of the suspension is separated from the base plate, the lower tree-shaped support and the lower grid support structure will form a thin and tall structure. Under the influence of thermal stress and the friction of the powder spreading device, this kind of thin and tall structure is insufficient in strength and rigidity. The high support structure is easy to break and difficult to form; although the solid support can achieve a better support effect, it can only be removed by machining, which also increases the powder consumption and reduces the forming efficiency

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