摘要
在建立孔型斜轧几何模型的基础上对螺旋高翅片管孔型斜轧变形区的运动规律进行研究,发现轴向延伸与变形区轧件圆周旋转速度的分布有关.在变形区轧件从咬入到轧出圆周旋转速度存在递增的趋势,在孔型等螺距的情况下使轴向速度也在递增,这是导致轧件轴向延伸的本质原因.通过理论分析给出了轴向延伸率的理论计算公式,用两种规格的坯管在不同的压下量下进行轧制实验,结果表明延伸率的计算值与实测值基本吻合.
Based on the geometric model established for rotary roiling of high helical finned tubes, the motional behavior of a rolling piece in the deformation zone was investigated, and the results show that the phenomena of axial elongation has a connection with the distribution of circumferential velocity. It is the essential reason to make a rolling tube elongate along the axial direction that the axial velocity in the deformation zone increases along with the circumferential velocity in the condition that the pitch value of the groove keeps changeless along the axis. A formula of axial elongation rate was given on the basis of theoretical analysis. In order to verify the formula of elongation rate, rolling experiments for two types of rolling pieces in different reductions were conducted and the results approximately agreed with the theoretical values.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第10期1292-1296,共5页
Journal of University of Science and Technology Beijing
基金
广东省教育部产学研结合项目(No.2006D90404023)
关键词
孔型斜轧
翅片管
运动学分析
延伸率
rotary rolling
finned tube
kinematic analysis
elongation rate
