激光选区熔化多振镜系统的打印时间预估算法  

Printing-Time-Estimation Algorithm for Selective Laser Melting Multi-Galvanometer System

作　　者：翁丰强 杨永强[1] 陈锌 李阳[1] Weng Fengqiang;Yang Yongqiang;Chen Xin;Li Yang(School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou,Guangdong 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641

出　　处：《中国激光》2021年第18期178-191,共14页Chinese Journal of Lasers

基　　金：广东省重点领域研发计划项目(2018B090905001);广东省重点领域研发计划项目(2020B090924002);国家自然科学基金(U2001218、51875215、81772428);广东省特支计划(2019TQZ110);广东省区域联合基金重点项目(2020B1515120013)。

摘　　要：激光选区熔化(SLM)技术是目前最主要的激光粉末床熔融制造方式之一。SLM技术是基于逐层制造成型的过程,其工作时间成本一直是该技术领域的重要科学问题。该研究将为激光选区熔化多振镜系统的打印时间预估提供一种准确的算法及计算思路。铺粉式的激光选区熔化设备的打印原理主要涉及铺粉模块将金属粉末均匀地铺在制造成型区域和振镜扫描系统完成制造成型的扫描打印工作。该算法基于铺粉式的激光选区熔化设备的打印原理,采用多振镜激光选区熔设备软件控制系统编程,将算法程序集成到设备控制系统之中。该算法先通过模型图和工艺参数来计算得出激光选区熔化设备的扫描系统理论打印时间,再通过设备控制系统在打印过程中获得各个计时单元铺粉模块实时运行的时间,并采用计时单元内铺粉模块的算数平均值来提高各计时单元内铺粉模块时间预估精度。利用SLM设备扫描系统的实际运行时间和时间预估数值的差异,进行校正参数的实时修正。通过累加SLM设备每一层的打印时间,最终得到较为准确的制造成型时间预估。实验验证表明,十小时以上的打印任务中,打印预估时间和实际打印时间之间的偏差率小于±1%。本研究的算法可以准确地得到打印任务的工作时长,为SLM控制系统提供一种有效的时间预估方法,在帮助企业合理计划生产任务、预估打印成本和控制系统优化方面提供了新方向,有助于推动SLM设备和控制系统的持续发展。Objective Selective laser melting(SLM)technology is one of the most important manufacturing methods for laser powder bed fusion(LPBF).SLM technology is based on the layer-by-layer manufacturing process.Even with the wide application of SLM technology,its working time cost has remained a crucial scientific problem in this technical field.The working time of SLM additive manufacturing equipment is becoming increasingly important in production applications.Predicting the working time of additive manufacturing equipment has great practical significance in the operation and maintenance of the whole equipment and cost control.This study provides an accurate algorithm and calculation method for predicting the printing time of themultilaser SLM system.Methods The algorithm is based on the basic working principle of powder-laying SLM equipment.We employed the software control system of the multi-galvanometer SLM equipment to program and integrate the algorithm into the equipment control system.First,the algorithm calculated the theoretical printing time of the scanning system of the SLM equipment using the model diagram and process parameters and then obtained the real-time operation time of the powder-laying module of each time unit using the equipment control system in the printing process.The average number of powder-laying modules in the time unit was used to improve the time-prediction accuracy of the powderlaying module in each time unit.Adjusting the correction parameters in real-time was conducted using the difference between the actual operation time and the time-prediction value of the scanning system of the SLM equipment.By accumulating the working time of each layer of the equipment,a more accurate prediction of the manufacturing molding time was obtained.The practicability of the algorithm was verified using the existing dual-galvanometer SLM equipment.The experimental prototype was DiMetal-450,developed independently by Laseradd Technology(Guangzhou)Co Ltd,with loading CLI file data and setting reasonable pa

关 键 词：激光技术 激光选区熔化 时间预估 控制系统 多振镜 算法 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]