激光近净成形中熔池宽度实时监控系统的研究

Study on real-time monitoring system of molten pool width during laser engineered net shaping

在激光近净成形过程中,为了快速有效地获取熔池区域信息并加以控制,文设计了CCD同轴拍摄系统获取熔池的双色图像,可以准确地获得熔池区域的图像信息,并利用最小外接矩形图像处理方法快速有效地获取熔池宽度,通过PID控制器调节激光功率加以控制。实验表明,基于双色图像的CCD同轴拍摄方法和熔池宽度闭环控制系统有效解决了激光往复扫描下薄壁工件的边缘凸起和上下宽度不均匀的问题。

In the process of laser engineered net shaping,in order to quickly and efficiently to obtain the information of molten pool and control it,this paper designs a CCD coaxial camera system for dual color images of the molten pool,it can accurately obtain the image information of molten pool.The computer uses the minimum bounding rectangle image processing method to obtain the molten pool width quickly and efficiently,and controlled by PID controller to adjust the laser power.The experimental shows that the CCD coaxial camera system based on dual color image and the closed loop control of molten pool width can effectively solve the problem of edge bulge and uneven width of the thin-walled workpiece under the reciprocating laser scanning.