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。
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.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第6期198-204,共7页
Chinese Journal of Lasers
关键词
激光技术
直接成型
倾斜摆放方式
免装配机构
选区激光熔化
laser technique
direct fabriction
titling display
non-assembly mechanism
selective laser melting
作者简介
作者简介：苏旭彬（1981-），男，博士研究生，主要从事激光加工及快速成型等方面的研究。E-mail：scutsxb@yahoo．com．cn导师简介：杨永强（1961-），男，教授，博士生导师，主要从事激光加工等方面的研究。E-mail：meyqyang@seut．edu．cn（通信联系人）。
