曲轴箱缸头多肉凸块缺陷原因分析  

Analysis of Reason Causing Metallic Projection Defect of Crankcase Head

作　　者：罗雪峰 

机构地区：[1]广东省韶铸集团有限公司,广东韶关511100

出　　处：《现代铸铁》2012年第6期90-92,共3页Modern Cast Iron

摘　　要：灰铸铁曲轴箱缸头厚大部位曾发现有多肉凸块缺陷。分析认为:导致该缺陷的主要原因是CE偏高及孕育量过大、缺陷部位局部模数较大,使铸件在凝固过程中石墨化膨胀量较大;此外,型砂强度偏低、砂型刚度不够及浇注温度偏高也是引发该缺陷的辅助因素。通过适当降低CE和孕育量、采用Si-Sr孕育剂、控制型砂强度,已基本消除缺陷。Metallic projection defect had been found on the heavy section location of the gray iron crankcase head.It was considered after analysis the main reason causing this type defect is that CE and inoculant addition was too high,as well as the local modulus of defect location was relatively bigger and therefore,the graphitization expansion was relatively bigger.And in addition,the strength of the molding sand and rigidity of the mold was not enough high as well as the pouring temperature was relatively higher that also were the assistant factors causing the defect formation.By properly decreasing CE and inoculant addition,using Si-Sr containing inoculant and controlling strength of the molding sand,the defect has been basically eliminated.

关 键 词：灰铸铁 多肉凸块 石墨化膨胀 碳当量 孕育量 

分 类 号：TG251[金属学及工艺—铸造]