落地镗床床身断裂分析  

Analysis on Fracture Bed for Floor Type Boring Machine

作　　者：王志明[1] 尚尔峰[1] 王亚勤[1] 

机构地区：[1]沈阳铸造研究所,辽宁沈阳110022

出　　处：《热处理技术与装备》2015年第6期62-66,共5页Heat Treatment Technology and Equipment

摘　　要：采用宏观、微观及SEM等检测方法,对落地镗床床身断裂原因进行了检测分析。结果表明,由于床身显微组织中存在大块状及初生粗大直片状C型石墨,石墨长度及共晶团组织过于粗大,致使其脆性增大,抗拉强度低于标准中HT300铸件本体预期值,力学性能恶化。当床身时效处理过程中受到较大应力作用时,导致床身沿横向断裂。The cause of fracture for bed of floor type boring machine is analyzed by means of macro and micro examinations. The results show that macrostructure of bed has large bulk graphite and primary coarse flake type C graphite. Oversize graphite length and eutectic cell structure result in increasing brittleness and decreasing of extension strength so that the mechanical properties of boring machine bed are not meet the specifications. Stress cause fracture in transverse direction on floor type boring machine bed during the aging treatment.

关 键 词：落地镗床床身 C型石墨 石墨长度 共晶团 应力 

分 类 号：TG535[金属学及工艺—金属切削加工及机床]