不同工艺参数对激光粉末床熔融熔池辐射强度的影响规律  

Effects of Different Process Parameters on Molten⁃Pool Radiation Intensity of Laser Powder Bed Fusion

作　　者：邓萌 周鑫[2] 成星 张婷[4] 王学德[2] 居婷 Deng Meng;Zhou Xin;Cheng Xing;Zhang Ting;Wang Xuede;Ju Ting(School of Aeronautics,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Airborne Plasma Dynamics,Air Force Engineering University,Xi’an 710038,Shaanxi,China;Xi’an Aerospace Mechatronics&Intelligent Manufacturing Co.,Ltd.,Xi’an 710100,Shaanxi,China;School of Future Technology,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]重庆交通大学航空学院,重庆400074 [2]空军工程大学航空等离子体动力学重点实验室,陕西西安710038 [3]西安空天机电智能制造有限公司,陕西西安710100 [4]西安交通大学未来技术学院,陕西西安710049

出　　处：《中国激光》2024年第24期200-215,共16页Chinese Journal of Lasers

基　　金：陕西省重大专项(2018zdzx01-04-01)。

摘　　要：激光粉末床熔融在线监测技术能够通过实时监测一些过程特征信号来反映成形过程,判断成形质量,其中熔池辐射强度是重要的过程特征信号之一,但目前就熔池辐射强度信号进行在线监测的深入分析较少,并且分析难度较大。基于此,本课题组提出了基于偏差积分曲线、概率密度函数曲线、相对热图的三种熔池辐射强度分析方法。研究了工艺参数的变化对熔池辐射强度的影响规律,讨论了工艺参数对熔池辐射强度的影响机理,最后验证了不同工艺参数对熔池辐射强度的影响规律。结果表明:随着扫描间距和扫描速度减小、激光功率增大到一定范围,即激光能量密度增加到一定范围,熔池辐射强度总体增大,数据波动程度增加且分布范围变广;刚开始打印后一段时间内的熔池辐射强度偏小,结束打印前一段时间内的熔池辐射强度偏大;所提分析方法可以实现工艺参数的识别。未来可结合致密度、表面粗糙度等性能数据实现成形质量的在线判断。Objective To ensure the forming quality and stability of laser powder bed fusion(LPBF),an online monitoring technology must be developed.Using diodes to obtain the radiation intensity of molten pools can accurately reflect their temperature and other important information in real time.It is an economical and efficient method for monitoring the forming process and features low cost,high sensitivity,rapid response,and a small sample size.However,the associated analysis is limited and challenging;therefore,the mapping relationship between the radiation monitoring data of molten pools and the forming process must be analyzed.Process parameters significantly affect the performance of metal additive-manufactured components.Most current production process parameters are not necessarily optimum,which implies that they may cause manufacturing defects.Determining the optimal forming process parameters for each metal via numerous forming experiments is time consuming and labor intensive.Therefore,by analyzing the mapping relationship between the process parameters and radiation intensity of a molten pool,quality monitoring and process adjustments can be realized through online monitoring.This can prevent defects or even failures caused by process parameters and significantly reduce the time,manpower,and financial resources required for forming experiments.Although the radiation intensity of molten pools and the related process parameters have been investigated extensively,a method for adjusting the process parameters directly using the radiation intensity of the molten pool has not been devised.Therefore,the effects of different process parameters on the radiation intensity of molten pools must be investigated to identify and adjust the process parameters.Methods To determine the mapping relationship between the process parameters and radiation intensity of molten pools,three methods for analyzing the radiation intensity of molten pools were proposed:the deviation integral curve,the probability density function curve,and re

关 键 词：光学数据处理 激光粉末床熔融 熔池辐射强度分析 变化规律 工艺参数识别 

分 类 号：TH16[机械工程—机械制造及自动化] TP277[自动化与计算机技术—检测技术与自动化装置]