康明斯L缸体渗漏原因分析及防止措施  

Leakage Reason Analysis and Prevention Measures of Cummins L Cylinder Block

作　　者：赵学清 吕姗姗 洪恒发 杨欣 

机构地区：[1]东风汽车股份有限公司铸造分公司,湖北襄阳441004 [2]无锡一汽铸造有限公司,江苏无锡214174

出　　处：《现代铸铁》2014年第6期67-71,共5页Modern Cast Iron

摘　　要：介绍了康明斯L缸体的铸件结构、生产条件及缺陷特征.对渗漏部位的缺陷进行了分析研究,认为热节部位的缩松是导致分油道渗漏的主要原因.根据原因分析,采取了如下措施：在热节部位设置冷铁以及涂刷Te粉涂料,加快这些部位的冷却速度;感应电炉熔炼时尽可能保持w（C）量稳定,降低原铁液白口倾向;使用经过高温石墨化处理的增C剂;将浇注温度控制在1 400～1 420℃.结果显示：有效地降低了由油道部位缩松引起的铸件渗漏废品率,使L缸体渗漏废品率从2.65％降低至0.5％以下.历时半年的生产验证表明,渗漏废品率非常稳定.An introduction was conducted to the casting construction,production conditions and defect characteristic.The defect of leakage locations was analyzed and investigated.It was considered that the shrinkage porosities in the hot spots were the main reason causing leakage in branches of the oil canal.Based on the reason analysis,the following measures were adopted：setting densener and brushing Te-powder coating at the hot spot areas to accelerate the cooling rate of these areas; keeping the carbon content as stable as possible during induction furnace melting to reduce chilling tendency of the base iron melt;using the carburizer which had been graphitizing-treated at high temperature;controlling the pouring temperature in the range of 1 400～1 420 ℃.The result showed,the leakage rate caused due to shrinkage porosities in branches of the oil canal was effectively decreased.The productive validation showed that the leakage-caused rejection rate was very stable.

关 键 词：灰铸铁 缸体 渗漏 冷铁 Te粉涂料 

分 类 号：TG251[金属学及工艺—铸造]