In this paper, the skin-core combined with the triple contour method is proposed to solve the density and roughness problems of selective laser melting. Based on the skin-core strategy, the surface roughness is optimized by laser parameter adjustment, and the high-quality side-surface formation is achieved by the triple contour method. The results showed that the relative density increases first and then decreases with increasing in-skin energy density, and surface roughness decreases with increasing up-skin energy density. The effects of the skin-core parameters have been analyzed. In addition, a triple contour scanning strategy was also conducted, and the variation of surface roughness caused by the different number of contours has been analyzed, along with the fabrication of the Ti6Al4V denture bracket. Results showed that the inclined surface roughness could be improved by the triple contour method to an average roughness (Ra) of 3.5 μm. An average surface roughness of less than 4.3 μm and a relative density of 99.8% have been achieved at the same time using the skin-core and triple contour strategy. The curved surface and overhanging structure quality of the denture bracket was also improved. This work provided a novel approach for the additive manufacturing of a medical titanium alloy.

中文翻译：

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基于皮芯和三重轮廓扫描策略的选区激光熔化钛合金参数优化

本文提出了皮芯结合三重轮廓法来解决选择性激光熔化的密度和粗糙度问题。基于皮芯策略，通过激光参数调整优化表面粗糙度，通过三重轮廓法实现高质量侧表面成形。结果表明，相对密度随着皮内能量密度的增加先增加后减小，表面粗糙度随着皮内能量密度的增加而减小。已经分析了皮核参数的影响。此外，还进行了三重轮廓扫描策略，分析了不同轮廓数量引起的表面粗糙度变化，以及Ti6Al4V义齿托槽的制作。结果表明，斜面粗糙度可以通过三重轮廓法提高到平均粗糙度（Ra）为3.5μm。使用皮芯和三重轮廓策略同时实现了小于 4.3 μm 的平均表面粗糙度和 99.8% 的相对密度。义齿托槽的曲面和悬垂结构质量也得到了改善。这项工作为医用钛合金的增材制造提供了一种新方法。