【摘要】 研究激光同轴送粉中金属粉末流场的分布特性,对指导激光制造技术应用具有直接指导意义。重点研究了激光制造中同轴送粉条件下金属粉末流的浓度场,建立了同轴送粉嘴金属粉末流的浓度场理论模型,开发了一种新型数字粒子图像检测系统检测粉末流浓度场。该系统主要包括Nd3+∶YAG激光器和CCD相机。它具有非接触测量、检测速度快、能同时给出流场的三维信息等特点。实验结果表明,粉末流的聚焦参数和浓度场分布可以通过数字粒子图像检测技术进行检测,为指导同轴粉嘴设计和激光制造粉末流参数测定提供了新的手段。更多还原

【Abstract】 The research on the distributions of metal powder stream from co-axial nozzle is very interested in laser manufacturing.The paper was focused in the concentration field of powder stream.Theoretic model of concentration field of powder stream from the co-axial nozzle has been established.A new digital particle image measurement technique has been developed to measure the concentration field of powder stream.The system mainly consists of Nd~+∶YAG laser and charge coupled device(CCD) camera.It is shown that focus parameters and concentration distribution of powder stream can be measured by the technique.The system could be a useful device for laser manufacturing after further developed.更多还原