Maosheng LI
,
Yongnian YAN
,
Shihong ZHANG
,
Dachang KANG
材料科学技术（英文）
Nowadays, with the development of spinning processes, more and more systematic research about spinning parameters has been published. Based on these results, a routing about how to select spinning parameters has been gradually formed. However, ball spinning, due to its own features plus research lack, is still unclear about its parameter selections. In addition, some manufacture-enterprises only notice the use of this technique whereas ignore the theory creation. The optimal parameters about the ball spinning although have been released from these enterprises but in fact not a helpful theory for other researchers and producers. Focus on selecting the parameters based on the trial-and-error, this article has carried a series of experiments to study the influence on the spinning working course from those parameters, especially the peeling phenomena, and the tube diameter bulging. An optimal graph of the working angle, the axial feeding rate, and the acceptable working course is put forward. Additionally, based on the theory of the minimal reduction rate, the selection of the ball diameter is finally described. Thus, it has given the rules to get the proper parameters in ball spinning.
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Working angle
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Hongyi SUN
,
Yu CHEN
,
Dachang KANG
材料科学技术（英文）
This paper describes a new metal plastic forming process named "shear-extrusion" The new process is studied by using numerical analysis and experiment methods, and applied to form large-size high pressure valve bodies used by power plant boiler. Finally, the valve bodies have been successfully formed on the 10000 kN screw press.
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