关键词: 数字孪生, 选择性激光熔融, 在线监控, 智能成形

Abstract: The Selective Laser Melting (SLM) of metal is developing towards higher precision,higher efficiency,and intelligence.Due to the extremely hot and cold characteristics of the laser melting process,the quality defects of the built parts have always hindered the wide application of SLM technology.To overcome these shortcomings and manufacture high-quality parts,an on-line monitoring and process control of the machining process was carried out.A digital twin-driven on-line monitoring method of metal SLM forming process was proposed,which was used to establish an intelligent building system and conduct case analysis.Based on the physical and virtual modeling of the powder melting process,online process monitoring and big data analysis,a digital twin system for online monitoring of the building process including the equipment layer,data conversion layer,network layer,control layer and application layer was constructed.The functions of each layer and the key technologies involved were discussed,and the typical application examples of SLM building process monitoring were analyzed.It provided theoretical and technical support for intelligent building based on SLM.

Key words: digital twin, selective laser melting, on-line monitoring, intelligent building