The application of closed-loop control system in laser remanufacture is important to improve dimension precision , automation of forming course and intellectualization and has broad space to develop .Typical closed-loop control systems adopting molten geometry , 3-D size, molten pool temperature , laser power and multi-signal combination as monitoring methods , were analyzed from the principle and structures of closed-loop control systems.Meanwhile, the main control methods, such as laser position adjustment, powder feeding rate regulation or laser power control were introduced .Further, key links of construction were summarized in view of top-level design , sensor accuracy , algorithm complexity , reliability and system real-time.Based on the analysis of progress and related limitations of closed-loop control systems aboard and in China , construction difficulty of closed-loop control system was analyzed and concluded .The development directions , such as algorithm intellectualization , sensors integration , controlling parameters comprehensiveness , monitoring controlling network , were also put forward .%闭环控制系统在激光再制造工程中的应用,对提高激光再制造产品形状尺寸精度以及成形控制过程自动化、智能化水平具有重要意义,并具有广阔的发展空间. 从闭环控制系统原理及结构出发,对以熔池形状、3维尺寸、熔池温度、激光功率以及多信号联合等方式为监测方法的典型闭环控制系统进行分析,同时就出光位置调整、送粉速率调节、激光功率控制等主要控制方法进行概述,并从顶层设计、传感器精度、算法复杂度以及系统实时性和可靠性等方面对系统构建的关键性环节进行总结. 在分析对比国内外激光再制造闭环控制系统研究进展及相关局限性基础上,分析归纳系统构建难点,指出了激光再制造闭环控制系统将向算法智能化、传感器集成化、控制参量综合化以及监测控制网络化的方向发展.
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