应用激光, 2018, 38 (1): 13, 网络出版: 2018-05-03   

激光增材制造熔池温度实时监测与控制

Real-time Monitoring and Control of Melt Pool Temperature during Laser Additive Manufacturing
张荣华 1,2,*宋立军 1,2
作者单位
1 湖南大学机械与运载工程学院, 湖南 长沙 410082
2 湖南大学汽车车身先进设计制造国家重点实验室, 湖南 长沙 410082
摘要
激光增材制造技术是一门新兴的材料加工技术, 该技术在航空航天、快速原型制造、生物医疗等领域有着广泛的应用。激光增材制造过程中熔池温度是影响熔池尺寸及稀释度的主要因素, 通过对熔池温度的定量控制能够有效地提高零件成形的尺寸精度和力学性能。设计了一套基于状态空间方程的激光增材制造熔池温度预测控制系统, 该系统利用比色高温计采集熔池温度, 通过实时地调节激光功率实现对熔池温度的控制。设计的对比实验表明该系统能够实现熔池温度的定量控制, 提高制造过程的稳定性, 进而提高激光增材制造的质量。
Abstract
Laser additive manufacturing is a new material processing technology, which has been widely used in the fields of aviation, rapid prototyping manufacturing, and biological medicine. The melt pool temperature is the main factor that affects the size of the melt pool and the degree of dilution in laser additive manufacturing. The dimensional accuracy and mechanical properties of the parts can be improved effectively by controlling the melt pool temperature. In this paper, a predictive control system based on state space equation for melt pool temperature during Laser additive manufacturing processing is designed. The system uses a pyrometer to monitoring the temperature, and adjust the melt pool temperature through laser power. The contrast experiment shows that the system can realize the quantitative control of the melt pool temperature and improve the stability of the process, and then improve the quality of additive manufacturing.

张荣华, 宋立军. 激光增材制造熔池温度实时监测与控制[J]. 应用激光, 2018, 38(1): 13. Zhang Ronghua, Song lijun. Real-time Monitoring and Control of Melt Pool Temperature during Laser Additive Manufacturing[J]. APPLIED LASER, 2018, 38(1): 13.

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