内燃机SAE1144钢凸轮轴冷加工开裂原因  

Causes of cold working cracking of SAE1144 steel camshaft of internal combustion engine

作　　者：彭磊 徐旋旋 戴林荣 PENG Lei;XU Xuanxuan;DAI Linrong(Zenith Steel Group Co.,Ltd.,Changzhou 213011,China)

机构地区：[1]中天钢铁集团有限公司,常州213011

出　　处：《理化检验（物理分册）》2022年第1期45-48,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：内燃机SAE1144钢凸轮轴在冷加工过程中发生开裂。采用宏观观察、化学成分分析、金相检验和断口分析等方法,分析了该凸轮轴开裂的原因。结果表明:该SAE1144钢凸轮轴开裂属于层状撕裂;在镗孔加工过程中,润滑不良和凸轮轴轴心没有对齐造成车刀切向应力过大,从而在凸轮轴硫化物和铁素体界面处萌生裂纹,钢中存在的长条状硫化物及铁素体层状条带对裂纹的扩展有促进作用,裂纹扩展后造成凸轮轴开裂。The internal combustion engine SAE1144 steel camshaft cracked during cold working. Use methods such as macroscopic observation, chemical composition analysis, metallographic inspection and fracture analysis to analyze causes of cracking of the camshaft. The results showed that the cracking of SAE1144 steel camshaft was laminar tearing. In the boring process, poor lubrication and misalignment of the axis of the camshaft caused excessive tangential stress on the turning tool, resulting in cracks at the interface between the sulfide and ferrite of the camshaft. The long strip of sulfide and ferrite layered strips in steel promoted the propagation of cracks. After the crack propagated, the camshaft cracked.

关 键 词：SAE1144钢 镗孔加工 开裂 层状撕裂 凸轮轴 

分 类 号：TG115[金属学及工艺—物理冶金]