按需喷射下金属熔体流动行为数值分析
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摘要
金属熔体沉积增材制造技术可通过逐层堆积直接成形零构件,无需特殊模具和昂贵设备,被公认为是一种节能、降耗的新型快速成型方法,极具发展潜力。研究了按需喷射下金属熔体沉积、铺展凝固机理以及其工艺参数控制;层流和湍流不同情况下金属熔体沉积铺展的主要特征参数;探索了金属微熔体在小空间、大时间温度梯度环境下沉积成型中熔体流动行为、凝固成型机理。这种成形方法将为复杂金属构件的高效控形控性增材制造开拓新途径。
Metallic melts deposition material-adding manufacturing technology can directly form zero components through layer-by-layer accumulation, without special mould and expensive equipment, which has been widely recognized as a new kind of energy saving & consumption reduction rapid prototyping method with extreme development potential. The metallic melts deposition, spreading solidification mechanism and the process parameter control under on-demand injection have been studied. The melt flow behavior and solidification molding mechanism of the micro metal melt have been explored during deposit forming process in little space & large time temperature gradient environment. The main characteristic parameters of metal melt during deposit spreading process have been studied under laminar flow and turbulent flow conditions. This method will create a new method for efficient control material-adding production of complex metal member.
Metallic melts deposition material-adding manufacturing technology can directly form zero components through layer-by-layer accumulation, without special mould and expensive equipment, which has been widely recognized as a new kind of energy saving & consumption reduction rapid prototyping method with extreme development potential. The metallic melts deposition, spreading solidification mechanism and the process parameter control under on-demand injection have been studied. The melt flow behavior and solidification molding mechanism of the micro metal melt have been explored during deposit forming process in little space & large time temperature gradient environment. The main characteristic parameters of metal melt during deposit spreading process have been studied under laminar flow and turbulent flow conditions. This method will create a new method for efficient control material-adding production of complex metal member.
引文
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[2]Terakubo M,Oh J,Kirihara S,et al.Freeform fabrication of Ti-Ni and Ti-Fe intermetallic alloys by 3D Micro Welding[J].Intermetallics,2012,15(2):133-138.
[3]Horii T,Kirihara S,Miyamoto Y.Freeform fabrication of Ti-Al alloys by 3Dmicro-welding[J].Intermetallics,2008,16(11-12):1245-1249.
[4]Horii T,Kirihara S,Miyamoto Y.Freeform fabrication of superalloy objects by 3D micro welding[J].Materials&Design,2009,30(4):1093-1097.
[5]Terakubo M,Oh J,Kirihara S,et al.Freeform fabrication of titanium metal by 3D micro welding[J].Materials Science and Engineering A,2015,402(1-2):84-91.
[6]Xiong X.A new method of direct metal prototyping:Hybrid plasma deposition and milling[J].Rapid Prototyping Journal,2008,14(1):53-56.
[7]Xiong X,Zhang H,Wang G.Metal direct prototyping by using hybrid plasma deposition and milling[J].Journal of Materials Processing Technology,2013,209(1):124-130.
[8]T.Ando,J.Chun,C.Blue.Uniform droplets benefit advanced particulates[J].Metal Powder Report,2009,54(3):30-34.
[9]Li S,Wu P,Zhou W,Ando T.Kinetics of heterogeneous nucleation of gas-atomized Sn-5 mass%Pb droplets[J].Materials Science and Engineering A,2013,473(1-2):206-212.
[10]Cheng S,Chandra S.A penumatic droplet-on-demand generator[J].Experiments in Fluids,2013(34):755-762.
[11]Stewart XC,Tiegang L,Chandra S.Producing molten metal droplets with a pneumatic droplet-on-demand generator[J].Journal of Materials Processing Technology,2015(159):295-302.
[12]Fang M,Chandra S,Park CB.Experiments on remelting and solidification of molten metal droplets deposited in vertical columns[J].Journal of Manufacturing Science and Engineering,Transactions of the ASME,2009,129(2):311-318.
[13]Orme M,Smith R.Enhanced Aluminum Properties by Means of Precise Droplet Deposition[J].ASME Journal of Manufacturing Science and Engineering,2010(122):484-493.
[14]Zhang SG,He LJ,Zhu XX,et al.Capillary wave formation on excited solder jet and fabrication of lead-free solder ball[J].Transactions of Nonferrous Metals Society of China(English Edition),2015,15(5):997-1002.
[15]Luo J,Qi L H,Zhou J M,et al.Study on stable delivery of charged uniform droplets for freeform fabrication of metal parts,Sci[J].China Technol.Sci,2011(54):1833-1840.
[16]Suli Li,Zhengying Wei,Jun Du,et al.The fusion process of successive droplets impinging onto a substrate surface[J].Journal of Appl.Phys.A,2015(120):35-42.
[17]Suli Li,Zhengying Wei,Jun Du,et al.A numerical analysis on the metal droplets impacting and spreading out on the substrate[J].Journal of Rare Metal Materials and Engineering,2015(3):18-44.
[18]Pei Wei,Zhengying Wei,Suli Li,et al.Splat formation during plasma spraying for 8 mol%yttria-stabilized zirconia droplets impinging on stainless steel substrate[J].Applied surface science,2014:538-547.
[19]DU Jun,WEI Zhengying,CHENZhen,et al.Numerical Investigation of Pile up Process in Metal Microdroplet Deposition Manufacture[J].Micromachines,2014,31(2):021601-1.