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我厂的750公斤空气锤,常发生上砧燕尾部分断裂现象,严重地影响了生产。为此,我们对锤砧这种早期失效进行了分析。一、概述锤砧的燕尾部分在工作过程中承受巨大的冲击负荷,处于大压、小拉的交变应力与附加弯曲应力迭加的应力状态。因此,要求燕尾部分有较高的强度和良好的冲击韧性、高的弯曲疲劳强度和足够的抗压屈服强度。上砧材料为5CrMnMo,这种材料的冲击韧性不够理想,对缺口很敏感。其工艺流程是锻造—退火(在RJX—75箱
750 kilograms of air hammer in our factory, part of the dovetail torn part of the anvil often occurs, seriously affecting the production. For this reason, we analyzed the early failure of hammer anvil. I. Overview Dove anvil part of the dovetail in the course of the work to withstand a huge impact load, at high pressure, small pull alternating stress and additional bending stress superimposed stress state. Therefore, the dovetail portion is required to have higher strength and good impact toughness, high bending fatigue strength and sufficient compressive yield strength. Anvil material on the 5CrMnMo, this material is not ideal impact toughness, the gap is very sensitive. The process is forging - annealing (in the RJX-75 box