Development of Freeform Design and Manufacturing Based on Selective Laser Melting

Changhui, 宋长辉 Song; Yongqiang, 杨永强 Yang; Ziheng, 叶梓恒 Ye; Di, 王迪 Wang

doi:10.3788/lop50.080026

Cited by 1 publication

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“…成一层一层的轮廓信息，控制激光束扫描金属粉末形成熔道，熔道相互搭接形成层面，逐个层面堆叠成三维金属零件 [1][2][3] [4][5] ，其应用范围已拓展到生物医疗、航空航天、汽车等领域 [6][7] 。虽然 SLM 技术适用于多曲面、非对称、内部结构精细等复杂产品的个性化定制，但成型的零件在尺寸精度、表面质量等方面依然存在缺陷 [8][9] 。尤其是成型多曲面零件，由于曲面具有外形复杂、拐点多、变截面、悬空等特点，其成型能力与规则直壁件有较大差异。Wang 等 [10] 采用 SLM 技术成型了变截面的圆弧悬垂结构，研究了不同激光能量输入对非水平悬垂结构成型的影响；杨雄文等 [11] 基于 SLM 成型典型几何特征的尺寸精度及成型能力的研究，提出了适用于 SLM 成型的零件设计规则；王续跃等 [12] 研究了几何形状的差异对激光熔覆成形的影响，获得向内倾斜和向外倾斜圆形薄壁件偏移量、成型高度和倾斜角度的差异关系；穆存远等 [13] 针…”

Section: 引言激光选区熔化(Slm)是一种基于激光熔化金属粉末的快速成型技术，成型原理是将设计的三维模型离散unclassified

Study on Surface Morphology and Roughness Variation of NiCr Alloy Curved Surface Manufactured by Selective Laser Melting

Shuzhen¹,

Yongqiang²,

Di³

2015

中国激光

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In order to directly fabricate customized metallic parts with complicated surface, the surface quality of curved surface feature manufactured by selective laser melting (SLM) technology should be ensured. The parameters of NiCr alloy are optimized by orthogonal experiment and two kinds of cylinders are fabricated with X-Y inter-layer staggered scan strategy. The surface morphologies of curved surfaces of the parts are studied using three dimensional super depth digital microscope and scanning electron microscope, and the corresponding surface roughness is measured. The results show that when fabricating the parts with curved surface placed in different spatial positions, contour error in layer and stair effect among layers stacked lead to the staircase-shaped profile and anastomosing morphology on curved surfaces, and even the worm-like or granular morphology on overhanging curved surfaces when the tilt angle is larger than 60°. Variation of the value of Ra is consistent with surface morphology. The results provide important guidance to improve surface quality of the parts with curved surface fabricated by SLM.

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