Characteristics of surface and subsurface of formed thread parts by axial-infeed thread rolling process  

作　　者：Shuowen ZHANG Dawei ZHANG Shengdun ZHAO Fei JIANG Myoung-Gyu LEE 

机构地区：[1]Xi’an Key Laboratory of Intelligent Equipment and Control,School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]Department of Materials Science and Engineering,Seoul National University,08826 Seoul,Republic of Korea

出　　处：《Chinese Journal of Aeronautics》2023年第3期471-481,共11页中国航空学报（英文版）

基　　金：supported by the Shaanxi Province Key Research and Development Program(2021GXLH-Z-049,2020GY-168);the Joint Fund for Aerospace Advanced Manufacturing Technology Research Key Program(U1937203);the State Scholarship Fund from the China Scholarship Council(CSC);the Talent Project of Bright Pearl of the Yellow Sea of Yancheng;support of Institute of Engineering Research at Seoul National University;grant from NRF(No.2022R1A2C2009315)。

摘　　要：The thread rolling process has been widely applied to manufacture high-performance thread parts.In this process,the evolutions of surface and subsurface are frequently introduced,which affect the working performance of manufactured parts.In this study,an axial-infeed thread rolling process(ATRP)is employed,and the macro-meso surface characteristics under different lubrications and operating conditions are investigated.Moreover,the distributions of microstructure and hardness on the subsurface of formed tooth are analyzed in detail,along with the study of stress state and yield strength change.It is found that the MoS_(2)grease is more effective in reducing the surface roughness and defects than the lubrication oil and water-base graphite during the ATRP process.Increasing rolling speed improves the quality of surface morphology and can reduce the surface roughness.On the subsurface of bottom and flank,intensive shear stress occurs in a narrow region,resulting in the elongation and refinement of the grains and increasing the low angle grain boundary fraction.Based on the grain size and plastic strain,the yield strength is predicted.The maximum yield strength and hardness on the bottom of formed tooth are improved by 41.2% and 39.4%,respectively.

关 键 词：ATRP LUBRICATION Surface characteristics Microstructure distribution Hardness improvement Grain size 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]