Processing limit maps for the stable deformation of dieless drawing

Tin bronze wires were produced by dieless drawing. The effects of heating power, the distance between cooler and heater as well as feeding speed on the diameter, the temperature field, and the deformation region profile of the wires were investigated. The results indi-cated that each processing parameter exhibited both lower and upper limits of stable deformation based on the criterion of stable deformation with the diameter fluctuation of ±0.05 mm. Both the temperature and its gradient of the deformation region increased with increasing heating power under stable deformation, but decreased with an increase in feeding speed. As the distance between cooler and heater increased, the temperature of the deformation region increased and the slope of the deformation region profile decreased. The processing limit map of sta-ble deformation exhibited a closed curve and the unstable deformation consisted of wire breakage and diameter fluctuations.

板料拉深成形过程中变压边力的数值模拟方法

起皱和断裂是板料成形过程的主要失效模式,合理控制成形过程中压边力,可以消除这些缺陷,提高成形性能.以轿车前门内板的成形为例,采用Dynaform软件对变压边力控制的成形工艺进行了数值模拟计算,并得到了该零件采取变压边力时的最优控制变压边力曲线.

无模拉伸工艺及发展

通过对变断面细长件产品特点的分析和其加工成形方法的比较，确定无模拉伸是最佳的成形方法。

压边力对圆锥形件拉深成形的影响

起皱和断裂是板料成形过程的主要失效模式,合理控制成形过程中的压边力,可以消除这些缺陷,提高成形性能。本文以圆锥形件的成形为例,采用Dynaform软件对变压边力控制的成形工艺进行了数值模拟计算,得到了最佳压边力变化曲线。本文还对模拟结果进行了实验验证。结果表明,变压边力拉深工艺能够极大提高板料的极限拉深高度。

变断面细长产品成形方法探讨

通过对变断面细长件产品特点的分析和其加工成形方法的比较,确定无模拉伸是最佳的成形方法.无模拉伸是近年来新开发的一种成形工艺,文中作了系统分析和介绍.

圆锥形件拉深过程中变压边力的研究

起皱和断裂是板料成形过程的主要失效模式,合理控制成形过程中的压边力,可以消除这些缺陷,提高成形性能。本文以圆锥形件的成形为例,采用Dynaform软件对变压边力控制的成形工艺进行了数值模拟计算,得到了最佳压边力变化曲线。本文还对模拟结果进行了实验验证。结果表明,变压边力拉深工艺能够极大提高板料的极限拉深高度。