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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 6    December 2003

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Deformation characteristics of mechanical expanding of thin-walled cylindrical parts
GUO Bao-feng(郭宝锋)1, NIE Shao-min(聂绍珉)1, JIN Miao(金 淼)1,  
LI Qun(李 群)1, WU Sheng-fu(吴生富)2

1. College of Mechanical Engineering, Yanshan University,
 Qinhuangdao 066004, China
2. China First Heavy Industry, Fula′erji 161042, China

Abstract:Mechanical expanding is one of the finishing processes in cylindrical part forming. The distribution of stress and strain shows clearly regional features. FEA simulation and experiments show that the deformation process can be divided into three phases called as rounding phase, expanding phase and unloading phase in turn, in which the main types of deformation are wall bending, circumference elongating and thickness reducing, and spring back respectively. And the longitudinal section can be divided into three portions: expanding region, transition region and rigid region. The plastic deformation occurs regionally in suspended portion. A regional convex in transitional portion is inevitable.

 

Key words: mechanical expanding; deformation characteristic; numerical simulation

ISSN 1672-7029
CN 43-1423/U

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