摘要
介绍了ATY气缸体铸件的结构及原生产工艺,阐述了裂纹产生的部位及特征,通过分析该铸件特定结构的凝固受力过程,发现该铸件裂纹附近凸轮轴窗口中间部位宽度尺寸比砂芯尺寸、铸件图纸尺寸还要大。从砂芯受热方面分析,形成凸轮轴窗口部位是横浇道芯,该砂芯在浇注后被形成铸件的铁液、横浇道及内浇道铁液紧紧包围着,使砂芯温度升高,同时也封闭了砂芯受热膨胀的退让空间。为此,进行了将横浇道芯掏空的试验。通过将横浇道芯掏空,解决了铸件轮廓尺寸胀大问题和裂纹问题。
The casting structure and former production technology of ATY cylinder block were introduced.The location and characteristics of cracking were described.By analyzing the solidification stress process of particular structure of the casting,it was found that the width of the middle part of the camshaft window near the cracking of the casting was larger than that of the sand core and the drawing dimension of the casting.From the analysis of the heating of the sand core,the forming place of the camshaft window was the runner core,which was tightly surrounded by the casting-forming iron liquid,the iron liquid of runner and ingate after pouring that caused the temperature of the sand core rising,and also closed the yielding space of the thermal expansion of the sand core.Therefore,the test to hollow the runner core was conducted.By hollowing the runner core,the problem of profile size expansion and problem of cracking have been solved.
作者
龙善北
LONG Shan-bei(Guangxi Yuchai Machinnery Co.,Ltd.,Yulin 537005,China)
出处
《现代铸铁》
CAS
2021年第1期33-35,39,共4页
Modern Cast Iron
关键词
灰铸铁
气缸体
裂纹
收缩率
退让性
gray iron
cylinder block
cracking
contraction rate
yieldability
