New controllable and near net bar fine-cropping system

Abstract

In this article, a new controllable and near net low-stress bar fine-cropping system was proposed and developed by combined using the stress concentration effect of the prefabricated V-groove and the propagation crack. The bar finecropping experiments were successfully carried out using a new proposed cropping load control strategy. Although the level of the stress intensity factor range DK greatly influences the cropping time and the cross-section quality, the cropped-billets can be directly used for the precision forging industry without additional machining.

Effect of shearing on production stability and die life in automatic multi-stage cold forging of an automobile wheel nut

“…Traditionally, shearing, piercing, and blanking have been studied using experimental methods (Zhang et al. [17]; Zhang et al [18], Luo [19], Organ and Mellor [12], Chan [20], Goijaerts [21], Matsumoto [22], Zhong [23]) or through combined experimental and theoretical approaches [24]. Even though the wide studies of shearing sheet metals have been widely accomplished in various ways, there have been few numerical studies of rod shearing to optimize the nal product [13,16,21,25].…”