中国激光, 2011, 38 (6): 0603021, 网络出版: 2011-05-20   

免装配机构的选区激光熔化直接成型工艺研究

Study on Process of Non-Assembly Mechanisms Directly Fabricated by Selective Laser Melting
作者单位
1 华南理工大学机械与汽车工程学院, 广东 广州 510641
2 香港大学机械工程系, 中国 香港
摘要
为了自由设计并快速制造出机构,引入了免装配机构的概念,即采用数字化设计和装配并采用选区激光熔化(SLM)一次性直接成型、无需实际装配工序的机构。分析了机构直接成型的难点和不同摆放方式对间隙内部支撑的影响;并分析了倾斜摆放方式对间隙成型质量的影响。采用不同的扫描速度加工出不同倾斜角度的样块,测试其极限成型角;设计最小间隙为0.2 mm的曲柄滑块机构并采用水平摆放方式和倾斜摆放方式分别直接成型,验证了机械机构的SLM直接成型方法的可行性。结果表明,在150 W激光功率、600 mm/s扫描速度、0.035 mm铺粉厚度、0.12 mm扫描间距的工艺参数下,所直接成型的曲柄滑块机构可以实现预设计的动作。机械机构的直接快速成型方法使机构的形状和结构更加多样化,且无需装配工序,实现了机构的快速制造。
Abstract
To obtain more design freedom and realize fast fabrication of mechanisms, a concept of non-assembly mechanism is introduced, which is digitally assembled and later directly fabricated using selective laser melting (SLM) technology. The effect of display on the number of support within the clearance is analyzed when the key points of directly fabrication of metal mechanism are obtained; then the effect of titling display on fabrication quality of clearance is studied. Some specimens with different angles are fabricated under different scanning speeds in order to obtain the critical fabrication angle; for experimental verification, a slider-crank mechanism with a minimum clearance of 0.2 mm is designed and two ones are fabricated by SLM using horizontal display and tilting display respectively under the process parameters of laser power of 150 W, scanning speed of 600 mm/s, powder thickness of 0.035 mm and track space of 0.12mm. Result shows that the slider-crank mechanism can be successfully fabricated by SLM. The methodology of directly fabrication of non-assembly mechanism will allow more design freedom and fast fabrication of mechanisms.
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苏旭彬, 杨永强, 王迪, 陈永华. 免装配机构的选区激光熔化直接成型工艺研究[J]. 中国激光, 2011, 38(6): 0603021. Su Xubin, Yang Yongqiang, Wang Di, Chen Yonghua. Study on Process of Non-Assembly Mechanisms Directly Fabricated by Selective Laser Melting[J]. Chinese Journal of Lasers, 2011, 38(6): 0603021.

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