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LIU Guohui
College of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, China
XIAO Wenhui
College of Material Science and
Engineering,
Yanshan University,
Qinhuangdao 066004, China
NI Liyong
College of Engineering,
Guangdong Ocean University,
Zhanjiang 524088, China
LIU Zhubai
College of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, China
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MECHANICAL ANALYSIS OF CYLINDERS BEING
UPSET BETWEEN SPHERICAL CONCAVE PLATEN AND CONCAVE SUPPORTING
PLATE*
Abstract: Mechanical analysis of
cylinders being upset between spherical concave platen and
concave supporting plate is conducted. Rigid-plastic mechanical
models for cylinders are presented. When the ratio of height to
diameter, is larger than 1, there exists two-dimensional tensile
stress in the deformed body, when the ratio is smaller than 1,
there exists shear stress in static hydraulic zone. The former
breaks through the theory that there is three-dimensional
compressive stress irrespective of any ratio of height to
diameter. The latter satisfactorily explains the mechanism of
layer-like cracks in disk-shaped forgings and the flanges of
forged gear axles. The representation of the two models makes
the upsetting theory into correct and perfect stage.
Key words:
Spherical concave platen Concave supporting plate Upsetting
Tensile stress
Shear stress |
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Biographical notes
LIU Guohui, male, born in 1970, is currently an associate professor in
College of Mechanical Engineering, Yanshan University, China. He
received his B.E. degree from Northeast Heavy Machine Institute, China,
in 1992. His research interests include new theories and processes of
plastic deformation and quality control. He published over 10 papers.
Tel: +86-335-8057011; E-mail: hello1760@sina.com
XIAO Wenhui, male, born in 1970, is currently a lecturer in College of
Material Science and Engineering, Yanshan University, China. He received
his B.E. degree from Northeast Heavy Machine Institute, China, in 1992.
His research interests include new theories and processes of plastic
deformation and quality control. He published over 10 papers.
NI Liyong, male, born in 1977, is currently a lecturer in College of
Engineering, Guangdong Ocean University, China. His research interests
include new theories and processes of plastic deformation and quality
control, knowledge innovation, etc. He published over 20 papers.
Tel: +86-759-2383020; E-mail: niliyong@sina.com
LIU Zhubai, male, born in 1936, is currently a professor and doctorate
candidates’ advisor in College of Mechanical Engineering, and master
degree candidates’ advisor in College of Literature and Law in Yanshan
University, China. He graduated from Harbin Institute of Technology,
Harbin, China, in 1960. His research interests include new theories and
processes of plastic deformation and quality control, knowledge
innovation, etc. He published over 130 papers, 34 of which indexed by EI
and SCI, and three monographs.
Tel: +86-335-8058733; E-mail: liuzb@ysu.edu.cn
References
[1] WANG Danian. Principle of metal forming [M]. Beijing: China Machine
Press, 1986. (in Chinese)
[2] CAO Hongde. Mechanical base of plastic deformation and rolling
principle[M]. Beijing: China Machine Press, 1983. (in Chinese)
[3] LIU Zhubai, NIE Shaomin, WANG Liandong, et al. A new theory for
upsetting a cylinder between flat platens[J]. Chinese Journal of
Mechanical Engineering, 1992, 5(4): 297-303.
[4] LU Yan. Theory and process of forging deformation[M]. Beijing: China
Machine Press, 1991. (in Chinese)
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