杯形件冷挤工艺,由于制品质量好、经济效益高,已开始广泛应用于各产业部门,是一种很有发展前途的冷锻工艺。虽然目前已用各种理论方法,包括上限法和有限元法等,对该工艺作了较为详尽的研究,但是在实验方法方面,一般还局限于应用网格法和硬度法等常规手段。本文将密栅云纹法扩大应用于杯形件反挤的变形分析,以便直观地反映出变形体内部质点的位移分布,然后通过塑性理论,由位移场确定应变速度场和接触面切应力分布,并为进一步分析反挤时坯料内的应力状态提供可靠的实验数据。 Cup-shaped cold extrusion process, due to good product quality, high economic efficiency, has begun to be widely used in various industrial sectors, is a promising cold forging process. Although a variety of theoretical methods, including the upper bound method and the finite element method, have been used to study the process in detail, the experimental methods are generally limited to the conventional methods such as the grid method and the hardness method. In this paper, the dense grille moiré method is applied to the deformation analysis of cup extrusion in order to intuitively reflect the displacement distribution of the particles in the deformation body. Then by plastic theory, the strain field and contact shear stress distribution are determined by the displacement field , And provide reliable experimental data for further analysis of the stress state in the anti-extrusion blank.