钢材的扩孔性能一般可用扩孔试验求出的扩孔率来评价,同种材料,由于试验条件的不同,测得的扩孔率存在显著差别。研究了不同的孔加工方式及毛刺朝向对扩孔率的影响,钻孔方式获得的扩孔率高于冲压孔方式获得的扩孔率,毛刺朝向与凸模运动方向相反时冲压孔获得的扩孔率,大于毛刺朝向与凸模运动方向相同时的冲压孔获得的扩孔率。 The hole expanding performance of steel can generally be evaluated by the hole expanding ratio obtained from the expanding hole test. The same type of material, due to different test conditions, there is a significant difference in hole expanding ratio. The effects of different hole processing methods and burr directions on the hole expanding rate were studied. The hole expanding ratio obtained by the drilling method was higher than that obtained by the punching hole method. The burr hole obtained when the burr was oriented opposite to the punch moving direction Pore ​​rate, greater than the burr orientation and punch the same direction of the punch hole obtained hole expanding rate.