Additive manufacturing and surface polishing synchronous processing method and device

Abstract

The invention provides an additive manufacturing and surface polishing synchronous processing method and device. The method is characterized in that after powder in a selected space at some slice layer is molten into a cladding layer by laser during layer-based forming processing of an additive manufacturing part, the inner outline surface and / or the outer outline surface of the cladding layer are quickly scanned and polished through laser so as to remove redundant materials in the selected areas on the inner outline surface and / or the outer outline surface, and then the cladding layer of the next slice layer can be formed and processed by laser until redundant materials in all selected areas on the inner outline surface and / or the outer outline surface of the whole additive manufacturing part are removed. With the adoption of the method, metal surface materials can be directly removed, and residual stress generated by additive manufacturing can be released; the technical route thatthe additive manufacturing technology and the surface polishing technology are synchronously carried out is capable of polishing the inner surface and the outer surface of any metal additive manufacturing part with a complex empty cavity; and the technical problem that the inner surface of an empty cavity of the part cannot be polished in later laser polishing or mechanical processing can be overcome.

Description

technical field [0001] The invention relates to the field of additive manufacturing and surface polishing, in particular to a simultaneous processing method and device for additive manufacturing and surface polishing. Background technique [0002] Additive manufacturing is the process by which engineered parts are produced by adding material layer by layer. First, design the three-dimensional model of the part and decompose the part model into many upwardly stacked thin layers, then generate a specified path for each layer of the model and send instructions to the additive manufacturing equipment, and then control the laser beam to melt the layers of each layer The powder is melted and formed into a cladding layer, which is superimposed layer by layer to form a three-dimensional part. In the process of layer-by-layer superimposition, the overlap of the contours of each layer will produce a part of right-angled steps beyond the contour surface, which is called the step effec...

AI Technical Summary

Problems solved by technology

For some laser additive parts and precision castings with complex shapes, as long as the laser beam can directly irradiate the surface area of ​​the part, it can be polished by ultra-fast laser polishing technology, while mechanical polishing is difficult Realize complex surface polishing; however, for complex and fine cavity structures, such as hollow blades and capillary metal tubes, since the surface of the inner cavity is closed in the part after processing, neither mechanical polishing nor laser polishing can be used for subsequent polishing. Inner surface polishing

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