Metal material additive manufacturing has the advantages of a short process and flexible design,which can meet the individual needs of complex structural parts in small batches.Compared with other metal additive manufacturing processes,molten-metal-direct writing(MMDW)has the advantages of low equipment cost and high efficiency.The stability of jet is the key influence factor of MMDW forming quality and accuracy.Four state models of jet flow:droplet flow,curved flow,smooth flow,and fluctuating flow,have been established.The numerical simulation method is used to study the morphological evolution process in the jet process.A revised equation of jet continuous length is obtained.The causes and development laws of jets in different states are revealed.The single track writing process experiments are carried out,and the ranges of substrate velocity under different jet states for uniform track writing are obtained.A reference basis for precise control of shape and performance of MMDW process has been provided.
关键词
金属增材制造/金属熔融直写成形/金属射流/射流稳定性
Key words
metal additive manufacturing/molten-metal-direct writing forming/metal jet/jet stability
维普
万方数据