冲压成形破裂极限的实验研究

• 作 者: 姜奎华
• 机 构: 武汉工学院,
• 出 处: 锻压技术
• 发表日期: 1982年03期
• 关键词: 冲压成形 成形极限 应力状态 应力比 冲压工艺 极限变形 胀形 极限应变 极限 const

文中采用应力比α=const的条件,推导了胀形的简化理论极限。实验表明,简化成形极限与实测结果接近;同样的材料在双向等拉应力状态下给出的厚度方向的变薄极限变形最大。因此,在满足冲压工艺要求的条件下,选用合适的应力状态,将有利于发挥材料的塑性潜力,降低材料的消耗。

In this paper, the simplified theoretical limit of bulging is derived by using the condition of stress ratio α = const. The experimental results show that the simplified forming limit is close to the measured one. The same material shows the thinning limit deformation in the thickness direction under the condition of bidirectional tensile stress. Therefore, to meet the requirements of stamping process conditions, the selection of the appropriate stress state, will be conducive to play the plastic material potential and reduce material consumption.