我厂750kg空气锤砧座的燕尾槽侧在使用中发现裂纹。最深达40mm,长约200mm。后来,裂纹漫延至下砧与砧座的接触部位(图1中A、B箭头所示),使砧座表层呈碎块裂断,碎裂面积A处为500×120mm,B处为300×100mm。经检查分析其原因是:下砧与砧座接触处系受冲击负荷较大的部位,因超负荷使用,造成击损;砧座表层组织疏松并有缩孔、夹砂等缺陷,内应力大,受到锤击后 I 750kg air hammer anvil dovetail groove side found in use cracks. The deepest up to 40mm, about 200mm long. Later, the crack spreads to the contact area between the lower anvil and the anvil (indicated by arrows A and B in FIG. 1), so that the surface of the anvil is fragmented. The fragmented area A is 500 × 120 mm and the area B is 300 × 100mm. The reasons for the inspection and analysis are as follows: the contact area between the anvil and the anvil is affected by the impact load, and the damage is caused by overloading; the surface structure of the anvil is loose with defects such as shrinkage and sand inclusion, large internal stress , After being hammering