3D printed parts post-processing methods|www.easoar-soon.com
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Author : jett
Update time : 2021-12-17 20:26:47
3D printed parts post-processing methods The main post-processing methods currently include finishing and machining. For high surface quality requirements: complex structural parts with Ra between 08μm and 16μm, the finishing process faces great challenges. The direct result of chemical polishing is the micro-roughness smoothing and polishing formation, as well as the parallel dissolution of the upper layer. Through chemical polishing and electrochemical polishing, the surface roughness of the porous implant is reduced from 6~12μm to 02~1μm. Introduction: One of the unsolved challenges in additive manufacturing is surface treatment and finish. In theory, additive manufacturing can freely create complex shapes, but in reality, surface finish usually requires design constraints. To Although improving the quality of the metal powder, optimizing the construction direction and process parameters can improve the surface quality of additive manufacturing parts to a certain extent, the surface roughness of the parts cannot be completely resolved. To Therefore, it is necessary to post-process the 3D printed parts. To The main post-processing methods include finishing and machining. To Let us take a closer look at these methods.
Metal 3D printing surface treatment.
Finishing process Finishing methods mainly include manual polishing, sandblasting or CNC grinding The quality of manual polishing depends to a large extent on the experience of the operators. The reproducibility and consistency are poor, the labor and time costs are high, and the dust generated during the polishing process is harmful to human health. To In addition, sandblasting and numerical control grinding have complex inner surfaces, porous structures and poor accessibility to parts. They are generally used to clean and polish the outer surfaces of parts to remove oxide layers. High surface quality requirements: For complex structural parts with Ra between 0.8 μm and 1.6 μm, the finishing process is facing huge challenges. To In addition to the above methods, there are also shape adaptive grinding, laser polishing, chemical polishing and abrasive flow machining. △Electropolishing Medical Implants. Shape adaptive grinding. Shape Adaptive Grinding (SAG) is a new process used to process free-form surfaces and difficult-to-process materials (such as ceramics and hard metals). To Although the rigidity of the processing equipment is relatively low, the semi-elasticity of the tool can achieve a high surface finish and ductility mode. To It is reported that some researchers have adopted spherical, flexible grinding head shapes, adaptive grinding methods, and polished free-form surfaces of titanium alloy 3D printed parts. To The surface defects of additive manufacturing are removed by rough polishing and fine polishing, and the final surface roughness Ra is less than 10 nm. To Laser polishing Laser polishing uses a high-energy laser beam to melt the surface material of the part again to reduce the surface roughness. To At present, the surface roughness of laser-polished parts is about 2~3μm. To Due to the high cost of laser polishing equipment, it has not been widely used in actual 3D printing post-processing processes. Chemical polishing The direct result of chemical polishing is that the micro-roughness is smooth, the polishing is formed, and the upper layer is dissolved in parallel. To In small-scale additive manufacturing, the effect of removing the hollow structure or the spherical layer that is easy to fall off on the surface of the hollow structure is significant. To Through chemical polishing and electrochemical polishing, the surface roughness of the porous implant is reduced from 6 to 12 μm to 0.2 to 1 μm. △Complicated structure Abrasive flow polishing effect of parts .Abrasive flow processing Abrasive flow machining (AFM) is a finishing process of the inner surface, which is characterized by the fluid carrying the abrasive flowing through the workpiece. To This fluid is usually very sticky, with the consistency of putty or dough. To AFM can smooth and polish rough surfaces, specifically for removing burrs, polishing the surface, forming a radius, and even removing materials. To The nature of AFM makes it an ideal choice for areas such as inner surfaces, grooves, holes, and cavities that are difficult to reach by other polishing or grinding processes. Powder bed integration technology can achieve the best surface quality among all metal additive manufacturing processes. To In addition to the above-mentioned finishing methods, sometimes it is necessary to process key components. To These two post-processing methods are widely used in 3D printing molds.
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