High-Efficiency Dynamic Scanning Strategy for Powder Bed Fusion by Controlling Temperature Field of the Heat-Affected Zone  

作　　者：Xiaokang Huang Xiaoyong Tian Qi Zhong Shunwen He Cunbao Huo Yi Cao Zhiqiang Tong Dichen Li 

机构地区：[1]State Key Laboratory of Manufacturing Systems Engineering,Xi’an Jiaotong University,Xian 710049,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第1期203-214,共12页中国机械工程学报（英文版）

基　　金：Supported by National High Technology Research and Development Program of China(863 Program,Grant No.2015AA042503);K.C.Wong Education Foundation.

摘　　要：Improvement of fabrication efficiency and part performance was the main challenge for the large-scale powder bed fusion(PBF)process.In this study,a dynamic monitoring and feedback system of powder bed temperature field using an infrared thermal imager has been established and integrated into a four-laser PBF equipment with a working area of 2000 mm×2000 mm.The heat-affected zone(HAZ)temperature field has been controlled by adjusting the scanning speed dynamically.Simultaneously,the relationship among spot size,HAZ temperature,and part performance has been established.The fluctuation of the HAZ temperature in four-laser scanning areas was decreased from 30.85℃to 17.41℃.Thus,the consistency of the sintering performance of the produced large component has been improved.Based on the controllable temperature field,a dynamically adjusting strategy for laser spot size was proposed,by which the fabrication efficiency was improved up to 65.38%.The current research results were of great significance to the further industrial applications of large-scale PBF equipment.

关 键 词：Powder bed fusion EFFICIENCY LARGE-SCALE Spot size Heat-affected zone(HAZ) 

分 类 号：TG1[金属学及工艺—金属学]