摘要
针对激光熔覆过程由于热输入难以准确控制,导致成型精度及质量难以达到预期的问题,通过搭建激光熔覆熔池监控系统,准确测量熔池尺寸,得出熔覆参数与熔池形貌之间的关系。利用彩色CCD比色测温方法,获取能显示温度场分布的温度伪彩图。结果表明:随着激光功率的变化,熔池形貌会产生较大的变化,而送粉率的变化对熔池形貌的影响表现并不明显。由于热累积,熔池的"拖尾现象"始终存在于熔池的整个熔覆过程中,并会随功率的增加愈加明显,使CCD相机测得的熔池的面积并不能准确反映出熔池在熔覆过程中的变化情况。因此,在后续的激光熔覆闭环控制系统的设计之中,应优先选用熔池宽度信息作为变量,以达到高质量熔覆的目的。
Aiming at the problem that the laser cladding process is difficult to accurately control due to the heat input, the molding accuracy and quality are difficult to achieve the expected problem. By building a laser cladding molten pool monitoring system, the size of the molten pool was accurately measured, and the relationship between the cladding parameters and the shape of the molten pool was obtained. Using the color CCD colorimetric temperature measurement method, a pseudo-color temperature map that can display the temperature field distribution is obtained. The results show that the morphology of molten pool changes greatly with the change of laser power. The influence of the change of powder feeding rate on the morphology of molten pool is not obvious. Due to heat accumulation, the "tailing phenomenon" of the molten pool always exists in the entire cladding process of the molten pool, and it will become more obvious with the increase of power. This makes the area of the molten pool measured by the CCD camera fail to accurately reflect the changes in the molten pool during the cladding process. Therefore, in the subsequent design of the laser cladding closed-loop control system, the width information of the cladding pool should be selected as the variable in order to achieve the purpose of high quality cladding.
作者
宋炜
程延海
澹台凡亮
田洪芳
杨金勇
侯庆玲
冯志杰
Song Wei;Cheng Yanhai;Tantai Fanliang;Tian Hongfang;Yang Jinyong;Hou Qingling;Feng Zhijie(School of Electrical and Mechanical Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Shandong Energy Heavy Equipment Group Dazu Remanufacturing Co.,Ltd.,Xintai,Shandong 271219,China)
出处
《应用激光》
CSCD
北大核心
2021年第1期183-188,共6页
Applied Laser
基金
国家重点研发计划项目(2018YFC1902400)
国家自然科学基金项目(51676205)。
关键词
激光技术
熔池监测系统
比色测温
熔池尺寸
熔池温度场
laser technique
molten pool monitoring system
colorimetric thermometry
molten pool size
temperature field of molten pool
