A method and device for simultaneous processing of additive manufacturing and surface polishing
A technology of additive manufacturing and synchronous processing, applied in additive processing, manufacturing tools, additive manufacturing, etc., can solve the problems of difficult and complex surface polishing, inability to use inner surface polishing, etc., and achieve high-performance results
Active Publication Date: 2022-08-05
SHANGHAI UNIV OF ENG SCI
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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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Embodiment Construction
[0033] The present invention will be further described below in conjunction with the accompanying drawings.
[0034] like figure 1 In theory, it can be considered that the surface roughness Ra of the additively manufactured part 8 should be equal to the height h of the triangle of the lamella step 16. According to the geometrical dimension relationship, it can be known that h=H*cosα (H is the thickness of the lamella, α is the surface inclination of the part angle), it can be seen that when the thickness of the lamella step 16 is constant, the surface roughness Ra has a cosine curve relationship with the surface inclination angle of the part, that is, the smaller the surface inclination angle, the greater the surface roughness; and when the surface inclination angle is constant, the surface roughness Ra increases linearly with the lamella thickness.
[0035] like Figure 4 As shown in the figure, during the layer-by-layer forming process of the additively manufactured part, ...
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A method and device for simultaneous processing of additive manufacturing and surface polishing. During the layer-by-layer forming process of additively manufactured parts, after powder in a selected space in a certain layer is melted and formed into a cladding layer by laser, the The inner contour surface and / or outer contour surface of the cladding layer is subjected to ultra-fast laser scanning polishing to eliminate excess material in the selected area on the inner contour surface and / or outer contour surface, and then the cladding layer laser of the next layer is carried out. Forming until excess material is removed from all selected areas on the inner and / or outer contours of the entire additively manufactured part. The method can directly remove the metal surface material and release the residual stress generated by the additive manufacturing; the process route of the additive manufacturing process and the surface polishing process is carried out simultaneously, and the inner and outer surfaces of any complex cavity metal additive parts can be processed. The polishing treatment overcomes the technical problem that subsequent laser polishing or mechanical processing cannot polish the inner surface of the component cavity.
Description
technical field [0001] The invention relates to the field of additive manufacturing and surface polishing processing technology, in particular to a method and device for simultaneous processing of 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 a 3D model of the part and decompose the part model into many upwardly stacked thin layers, then generate a specified path for the model of each layer and send instructions to the additive manufacturing equipment, and then control the laser beam to selectively melt the layers of each layer. The powder is melted and formed into a cladding layer, which is stacked layer by layer to form a three-dimensional part. In the process of layer-by-layer superposition, the overlapping of the contours of each layer will produce a part of right-angle steps beyond the contour surface, which is call...
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IPC IPC(8): B22F10/28B22F10/60B22F10/366B22F10/32B22F12/00B22F12/70B33Y10/00B33Y30/00B23K26/00
CPCY02P10/25
Inventor何博高双兰亮谭志俊金鑫源
OwnerSHANGHAI UNIV OF ENG SCI