A novel micro-rolling & incremental sheet forming hybrid process:Deformation behavior and microstructure evolution

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外文摘要：Thin-walled metal parts with functional micro-featured surface have broad application prospects in the fields of resistance reduction,noise reduction,etc.In this study,a novel micro-rolling & incremental sheet forming hybrid process(μR-ISF)is proposed to fabricate thin-walled metal parts with microgroove arrays.An analytical model which relates the rolling force and micro-groove depth in the micro-rolling stage was first established.Then,the formation mechanism of microgroove morphology during both micro-rolling stage and macro-shape forming stage are inves-tigated.After the micro-grooved sheet being incrementally formed,a significant reduction(between 21％to nearly 60％)is occurred in the depth of both transverse and longitudinal grooves compared to the flat sheet.Meanwhile,the width of transverse grooves decreases slightly by about 10％on average,while the width of longitudinal microgrooves increases significantly by more than 30％on average.After micro-rolling,85°{ 1012} tensile twins appear on the micro-grooved sheet and the percentage of 65°{1122} compressive twins increases.After incremental forming,the percentage of low-angle grain boundaries and the density of geometrically necessary dislocations in the formed part increase significantly,and the grain size distribution becomes more uniform.The present work provides a new strategy for the fabrication of 3D metal thin-walled components with surface micro-features.

外文关键词：

Incremental sheet formingMicrogrooves rollingSurface micromachiningGroove sizeMicrostructural evolution

作者：

Yanle LI、Feifei LIU、Hao YUAN、Xiaoqiang LI、Jianfeng LI、Guoqun ZHAO

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作者单位：

Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,Shandong University,Ji'nan 250061,China

School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,Shandong University,Ji'nan 250061,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaTaishan Scholar Project of Shandong ProvinceYouth Innovation Technology Support Program of Shandong Provincial Universities

项目编号：

5197532852275348tsqn2023060062022KJ041

出版年：

2024

DOI：

10.1016/j.cja.2023.10.021

中国航空学报(英文版)

中国航空学会

中国航空学报(英文版)

CSTPCDEI

影响因子：0.847

ISSN：1000-9361

年,卷(期)：2024.37(5)