Additive manufacturing selective forming device and forming method

Abstract

The invention relates to an additive manufacturing selective forming device and a forming method. The additive manufacturing selective forming device comprises a forming cylinder (1), the forming cylinder (1) comprising a plurality of sub-forming cylinders arranged in a geometrical shape array mode, and each sub-forming cylinder can be used independently or in combination according to the size shape of a to-be-formed part. According to the device and the method, the additive manufacturing selective forming device can be flexibly applied to manufacturing of various different parts, the powder can only be fully laid in the area needing to be formed so that the powder can be locally laid on a working table of the forming cylinder, the use amount of the powder can be reduced, and the powder utilization rate can be improved; and meanwhile, the powder pollution caused by sintering can be further reduced, the quality of the recovered powder is improved, and the recovery difficulty of the powder is reduced.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to an additive manufacturing selective area forming device and method. Background technique [0002] Additive manufacturing technology is a manufacturing technology based on digital layer-by-layer fusion accumulation to form entities. Powder bed additive manufacturing technology is one of the most commonly used technical methods in the field of additive manufacturing. Its basic process steps are as follows: first, the powder spreading device evenly spreads a thin layer of metal powder on the forming cylinder substrate; then, based on The two-dimensional slice data generated by the three-dimensional part model is scanned by laser or electron beam, and the scanned powder is sintered or melted and then bonded together to become a part of the formed metal part; Height, spread a new layer of powder on the surface of the formed part; repeat the above steps until the solid ...

AI Technical Summary

Problems solved by technology

[0003] The current international general-purpose selective laser melting (Selective Laser Melting, SLM) and electron beam melting (Electron Beam Melting, EBM) industrial-grade equipment has the following problems: When performing powder forming, the scraper scrapes across the entire substrate according to a certain layer thickness The powder spreading area is the area of ​​the upper surface of the substrate in the forming cylinder. The sintering area of ​​each layer of the actual part is often smaller than the upper surface area of ​​the entire substrate. After accumulating layer by layer, a large amount of redundant powder is required to fill the forming cylinder In the space outside the parts, the powder utilization rate is very low, which greatly increases the amount of powder that needs to be stored at one time, and the powder purchase cost increases

On the other hand, a large amount of redundant powder increases the difficulty of powder recovery and processing, increases the workload of powder recovery, screening and storage, and also causes powder pollution to a certain extent

[0004] At present, as the application of SLM and EBM technology in the forming of aerospace parts is becoming more and more mature, the size and complexity of parts formed by this device are gradually increasing. Correspondingly, the size of the forming cylinder of industrial-grade equipment using SLM and EBM technology is also corresponding The ground increases, making the technical defect of redundant powder more prominent

[0005] Aiming at the problem of low powder utilization caused by too much redundant powder, a device that can avoid or reduce redundant powder filling has appeared in the prior art. The base plate of the device has a shape that adapts to the profile of the formed metal part slice , and set inserts on the periphery or inside of the substrate to occupy as many positions as possible in the forming cylinder other than the parts to be formed during the additive manufacturing process, avoiding or reducing redundant powder filling

However, according to the size and shape characteristics of different metal parts, the device needs to be reconfigured and customized, so it is only suitable for batch additive manufacturing of specific parts, and it is difficult to meet the needs of different sizes and different materials under the premise of high powder utilization. Additive Manufacturing Requirements for Shape Parts

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