采用频率为20 k Hz及振幅分别为0,19,27,36和43μm的超声辅助振动,对Zr基非晶合金进行微压缩预处理,然后进行准静态压缩断裂试验,对断口进行扫描电镜(SEM)观察,使用ABAQUS模拟该过程,并基于超声波能流密度I表征对Zr基非晶合金常温塑性...采用频率为20 k Hz及振幅分别为0,19,27,36和43μm的超声辅助振动,对Zr基非晶合金进行微压缩预处理,然后进行准静态压缩断裂试验,对断口进行扫描电镜(SEM)观察,使用ABAQUS模拟该过程,并基于超声波能流密度I表征对Zr基非晶合金常温塑性性能的影响。结果表明:Zr基非晶合金变形区域发生剪切变形,以韧性断裂起主要作用;随着振幅或频率增大,弹性模量降低,等效应力分布更加均匀,应变增大,塑性变形越好,成形能力提高;当能流密度I超过9. 41×10~8W·m^(-2)左右时,非晶合金的可成形性随着超声波能流密度I的增大而降低。展开更多
Ultrasonic-vibration-assisted milling(UVAM)is an advanced method for the efficient and precise machining of difficult-to-machine materials in modern manufacturing.However,the milling efficiency is limited because the ...Ultrasonic-vibration-assisted milling(UVAM)is an advanced method for the efficient and precise machining of difficult-to-machine materials in modern manufacturing.However,the milling efficiency is limited because the ultrasonic vibration toolholder ER16 collet has a critical cutting speed.Thus,a 2D UVAM platform is built to ensure precision machining efficiency and improve the surface quality without changing the milling toolholder.To evaluate this 2D UVAM platform,ultrasonic-vibration-assisted high-speed dry milling(UVAHSDM)is performed to process a titanium alloy(Ti-6Al-4V)on the platform,and the milling temperature,surface roughness,and residual stresses are selected as the important indicators for performance analysis.The results show that the intermittent cutting mechanism of UVAHSDM combined with the specific spindle speed,feed speed,and vibration amplitude can reduce the milling temperature and improve the texture of the machined surface.Compared with conventional milling,UVAHSDM reduces surface roughness and peak-groove surface profile values and extends the range of residual surface compressive stresses from−413.96 MPa to−600.18 MPa.The excellent processing performance demonstrates the feasibility and validity of applying this 2D UVAM platform for investigating surface quality achieved under UVAHSDM.展开更多
文摘采用频率为20 k Hz及振幅分别为0,19,27,36和43μm的超声辅助振动,对Zr基非晶合金进行微压缩预处理,然后进行准静态压缩断裂试验,对断口进行扫描电镜(SEM)观察,使用ABAQUS模拟该过程,并基于超声波能流密度I表征对Zr基非晶合金常温塑性性能的影响。结果表明:Zr基非晶合金变形区域发生剪切变形,以韧性断裂起主要作用;随着振幅或频率增大,弹性模量降低,等效应力分布更加均匀,应变增大,塑性变形越好,成形能力提高;当能流密度I超过9. 41×10~8W·m^(-2)左右时,非晶合金的可成形性随着超声波能流密度I的增大而降低。
基金Funding was provided by the National Key R&D Program of China(Grant No.2020YFB2010500).
文摘Ultrasonic-vibration-assisted milling(UVAM)is an advanced method for the efficient and precise machining of difficult-to-machine materials in modern manufacturing.However,the milling efficiency is limited because the ultrasonic vibration toolholder ER16 collet has a critical cutting speed.Thus,a 2D UVAM platform is built to ensure precision machining efficiency and improve the surface quality without changing the milling toolholder.To evaluate this 2D UVAM platform,ultrasonic-vibration-assisted high-speed dry milling(UVAHSDM)is performed to process a titanium alloy(Ti-6Al-4V)on the platform,and the milling temperature,surface roughness,and residual stresses are selected as the important indicators for performance analysis.The results show that the intermittent cutting mechanism of UVAHSDM combined with the specific spindle speed,feed speed,and vibration amplitude can reduce the milling temperature and improve the texture of the machined surface.Compared with conventional milling,UVAHSDM reduces surface roughness and peak-groove surface profile values and extends the range of residual surface compressive stresses from−413.96 MPa to−600.18 MPa.The excellent processing performance demonstrates the feasibility and validity of applying this 2D UVAM platform for investigating surface quality achieved under UVAHSDM.
