本发明公开了一种金属板材边部成形极限的测试方法，建立包含压边圈、凸凹模及板材中心定位机构的球形凸模胀型试验装置；制备一侧中部包含圆弧缺口的薄板试样，试样边部根据需要加工不同的边部质量；将试样放置于球形凸模胀型模具一侧，使试样圆弧中心与球形凸模中心对齐，凸模上升过程中，边部在拉胀和侧向力的作用下在圆弧中心位置引发开裂。对具有较好边部质量的试样及较差边部质量或同等边部质量不同组织的材料进行试验，并通过数字化图像测量系统测量开裂位置的位移变化与主应变变化；通过对比位移或主应变，确定材料在特定边部状态下的边部成形极限，及材料对边部质量的敏感性。本发明能够准确评价边部成形极限及边部质量敏感性的方法。

The invention discloses a method for testing the edge forming limit of a metal plate, and establishes a spherical punch bulging test device comprising a blank holder ring, a punch and die and a plate center positioning mechanism; Prepare a thin plate sample with an arc notch in the middle of one side, and process different edge quality at the edge of the sample according to needs; Place the sample on one side of the expanding die of the spherical punch so that the arc center of the sample is aligned with the center of the spherical punch. During the rising process of the punch, the edge causes cracking at the arc center under the action of expansion and lateral force. The specimens with good edge quality and materials with poor edge quality or different tissues with the same edge quality are tested, and the displacement change and principal strain change of the cracking position are measured by the digital image measurement system; By comparing the displacement or principal strain, the edge forming limit of the material in a specific edge state and the sensitivity of the material to the edge quality are determined. The invention can accurately evaluate the edge forming limit and edge quality sensitivity.