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195 chai you ji gang ti lie wen yuan yin fen xi
Author(s): 
Pages: 33
Year: Issue:  9
Journal: Farm Machinery

Keyword:  柴油机缸体放水阀铸造缺陷裂纹原因温差过大气缸体嵌缝圆角缩松粘砂;
Abstract: <正> 一台使用不久的L195型柴油机,在气缸体放水阀上部(水套第四道加强筋下圆角处)产生裂纹,裂纹处伴有少量针眼气孔,由裂纹处向外渗水。分析其原因,一般为:冻裂、炸裂及本身铸造缺陷引起。由于冻裂的外部特征是裂缝呈散开状,且有嵌缝凸起,检查时,无此现象,故予以排除;进一步检查,该机放水阀位置稍高,冷却水放不净,残留水结冰,起动时骤加沸水,因温差过大,导致冷热分界
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