激光选区熔化成型NiCr合金曲面表面形貌及粗糙度变化规律研究

发布时间：2018-04-05 17:31

本文选题：激光技术　切入点：激光选区熔化　出处：《中国激光》2015年12期

【摘要】：为快速直接制造具有复杂曲面的个性化金属零件,需要保证激光选区熔化(SLM)成型曲面特征的表面成型质量。通过正交实验获得Ni Cr合金优化工艺参数,采用S型正交层错扫描策略成型两种柱面体模型;在超景深显微镜、扫描电镜下观察成型件内、外侧曲面表面形貌,并测量相应表面粗糙度。结果表明:成型不同空间位置摆放的曲面零件,各层面轮廓误差、层面间台阶效应的逐层堆叠最终使曲面形成台阶状、网结状形貌,成型倾斜切角小于60°的悬垂曲面时因粉末粘附严重甚至会形成条虫状、粒球状形貌;表面粗糙度Ra值与曲面特征表面形貌变化规律具有相关性,这为提高SLM成型曲面零件的表面成型质量提供了重要参考。
[Abstract]:In order to rapidly and directly manufacture individual metal parts with complex surfaces, it is necessary to guarantee the surface forming quality of laser selective melting (SLM) forming surface features.The optimized technological parameters of Ni-Cr alloy were obtained by orthogonal experiment, and two cylindrical models were formed by S-type orthogonal stacking fault scanning strategy. The surface morphology of the inner and outer surfaces of the molded parts was observed under the superfield depth microscope and scanning electron microscope.The surface roughness is measured.The results show that the contour error of each layer and the stacking of the step effect between the layers of the curved surface in different space position will result in the appearance of the surface in the form of steps and meshes.When the slanting tangent angle is less than 60 掳, the powder adheres seriously and even forms the spheroidal shape, the surface roughness Ra value has the correlation with the change law of the surface characteristic surface morphology, the surface roughness Ra value has the correlation with the surface characteristic surface morphology change rule.This provides an important reference for improving the surface forming quality of curved surface parts formed by SLM.
【作者单位】：华南理工大学机械与汽车工程学院;
【基金】：国家自然科学基金(51275179,51405160) 2014年公益研究与能力建设专项(2014A010104008) 佛山市科技创新专项(2013AH100042) 广东省科技计划项目(2014B010131002,2014B010129003)
【分类号】：TG665

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