中国机械工程学报

Sai Guo4; Wei Du5; Qinghong Jiang4; Zhigang Dong5; Bi Zhang4

2021

Chinese Journal of Mechanical Engineering   影响因子和分区

1000-9345

The Ti6Al4V parts produced by the existing selective laser melting (SLM) are mainly confronted with poor surface finish and inevitable interior defects,which substantially deteriorates the mechanical properties and performances of the parts.In this regard,ultrasonically-assisted machining (UAM) technique is commonly introduced to improve the machining quality due to its merits in increasing tool life and reducing cutting force.However,most of the previous studies focus on the performance of UAM with ultrasonic vibrations applied in the tangential and feed directions,whereas few of them on the impact of ultrasonic vibration along the vertical direction.In this study,the effects of feed rate on surface integrity in ultrasonically-assisted vertical milling (UAVM) of the Ti6Al4V alloy manufactured by SLM were systemically investigated compared with the conventional machining (CM) method.The results revealed that the milling forces in UAVM showed a lower amplitude than that in CM due to the intermittent cutting style.The surface roughness values of the parts produced by UAVM were generally greater than that by CM owing to the extra sinusoidal vibration textures induced by the milling cutter.Moreover,the extra vertical ultrasonic vibration in UAVM was beneficial to suppressing machining chatter.As feed rate increased,surface microhardness and thickness of the plastic deformation zone in CM raised due to more intensive plastic deformation,while these two material properties in UAVM were reduced owing to the mitigated impact effect by the high-frequency vibration of the milling cutter.Therefore,the improved surface microhardness and reduced thickness of the subsurface deformation layer in UAVM were ascribed to the vertical high-frequency impact of the milling cutter in UAVM In general,the results of this study provided an in-depth understanding in UAVM of Ti6Al4V parts manufactured by SLM.

Ultrasonically-assisted vertical milling Surface integrity Ti6Al4V Selective laser melting

英语

第一

ENGINEERING

WanFang

perioarticaljxgcxb-e202104003

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China
2.School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China
3.Key Labo-ratory for Precision and Non-Traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian 116024,China
4.南方科技大学
5.大连理工大学

Sai Guo,Wei Du,Qinghong Jiang,等. 中国机械工程学报[J]. Chinese Journal of Mechanical Engineering,2021,34(4):42-55.

Sai Guo,Wei Du,Qinghong Jiang,Zhigang Dong,&Bi Zhang.(2021).中国机械工程学报.Chinese Journal of Mechanical Engineering,34(4),42-55.

Sai Guo,et al."中国机械工程学报".Chinese Journal of Mechanical Engineering 34.4(2021):42-55.