GCr15套圈端面裂纹分析及工艺改进  

ANALYSIS OF CRACKS ON GCr15 BEARING RING END FACES AND PROCESS IMPROVEMENT

作　　者：陈涛 靳国兵 孙俊喜 李杰 Chen Tao;Jin Guobing;Sun Junxi;Li Jie(HBIS Group Hansteel Company)

机构地区：[1]河钢集团邯钢公司,河北邯郸056003

出　　处：《河南冶金》2024年第6期20-24,共5页Henan Metallurgy

摘　　要：在使用40 mm规格GCr15圆钢锻造生产轴承套圈过程中,套圈常出现端面裂纹问题。采用成分分析、宏观检查、低倍酸洗检验、顶锻试验和金相分析等手段对套圈开裂原因进行系统分析。结果表明:圆钢中心缩孔缺陷是造成套圈裂纹的主要原因。中心缩孔形成的剪切翘皮在后续加工过程不断被氧化发生变形,最终折叠在套圈端面形成裂纹缺陷。通过降低连铸拉速(由1.0 m/min降至0.9 m/min)和轧制速度(由3.8 m/s降至3.4 m/s),提高铸坯均热温度(由1 180~1 230℃升至1 210~1 260℃)等优化措施,消除了圆钢中心缩孔缺陷,套圈端面裂纹缺陷不再发生。During the process of forging bearing rings using 40 mm GCr15 round steel,the cracks were found on bear-ing ring end faces.The reason for cracking on bearing rings was systematically analyzed by means of chemical composition analysis,macroscopic test,magnification pickling inspection,forging test combined with the metallographic examination.The results show that the central shrinkage cavity of the round steel is the main cause of the cracks on bearing rings.The shea warping formed by the central shrinkage cavity on the end face of the billet is constantly oxidized and deformed in the sub-sequent processing,and eventually it forms a crack defect on the end surface of the ring.The process optimization measures such as reducing casting speed(from 1.0 m/min to 0.9 m/min)and rolling speed(from 3.8 m/s to 3.4 m/s)and increasing the soaking temperature of the billet(from 1180~1230℃to 1210~1260℃)aretaken,theshrinkagecavity defectinthe center of the round steel is eliminated and the crack defect on the bearing ring end faces does not occur again.

关 键 词：轴承套圈 端面裂纹 中心缩孔 降速轧制 拉速 

分 类 号：TG3[金属学及工艺—金属压力加工]