摘要
根据塑性流动理论,推导了圆管扩径过程厚向压变形与环向拉变形之比η的计算方法。进行了圆管扩径试验,按实测的扩径力反算了接触面的摩擦系数。提出了一种采用平均扩径系数,避免数值积分方法的η值工程算法。试验和计算结果表明,η值随扩径系数增大而减小;随顶锥锥角增大而增大。厚环向变形比的计算值和测量值符合较好。两种计算方法的结果相当一致。
Calculation method of thickness to circle deformation ratio η during tube expanding is deduced according to the plastic flow theory. The tube expanding tests are carried out. Then friction coefficient values of the interface are calculated according to the measured tube expanding forces. The engineering algorithm of the η value which can avoid numerical integrals is proposed by using average expanding coefficient. The results of experiments and calculations show that the η value decreases with the increase of expanding coefficient and that the η value decreases with the increase of punch angle. The calculated and measured η values are in good agreement. The results of two calculation methods are consistent on the whole.
出处
《塑性工程学报》
EI
CAS
CSCD
北大核心
2006年第3期52-55,共4页
Journal of Plasticity Engineering
关键词
圆管扩径
扩径力
厚环向变形比
tube expanding
expanding force
thickness to circle deformation ratio
