Influence of re-exposure parameters of top surface on surface quality and part strength in powder bed fusion

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  • 粉末床溶融結合における部品上面での再露光が表面性状および部品強度に与える影響
  • フンマツショウ ヨウユウ ケツゴウ ニ オケル ブヒン ウワツラ デ ノ サイロコウ ガ ヒョウメン セイジョウ オヨビ ブヒン キョウド ニ アタエル エイキョウ

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Abstract

<p>As powder bed fusion, which is the main technology in Additive Manufacturing, can built complex parts with high strength, it is expected to be useful as a next-generation manufacturing technology. However, this technology has problems associated with large surface roughness of parts. At present, the surfaces of parts are smoothed by post-processing procedures, such as mechanical polishing, but it is not possible to deal with complicated shapes. Therefore, a method for smoothing the surfaces during the build process is required. Factors that cause the surface of parts to be rough include insufficient melting of powder material and supply of the powder material to liquid regions. In this study, the influence of energy supply to the powder material on the surface roughness was investigated by varying the molten state of the processing region by re-exposure to a laser. The results indicated that the surface roughness can be reduced by optimizing the re-exposure energy, which also affects the strength of parts.</p>

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