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我厂生产的CA-10B型强化汽缸盖,外形尺寸为768×221×60,材质为HT20-40,要求水压试验,在3—4 kg/cm~2压力下,保持三分钟。水压试验时发现螺孔柱有不同程度的漏水现象,经解剖分析,主要是由于缩孔和缩松引起,废品率高达74％,鉴于此种情况,先后采用了多种方法以消除铸造缺陷,但均因效果不太显著而未彻底解决。经模拟试验分析确认:形成缩孔和缩松的原因主要是由于上、下壁与螺孔柱的厚度相差较大,特别是由于砂芯全部被铁水包围,螺孔
The CA-10B reinforced cylinder head produced by our factory has an external dimension of 768 × 221 × 60 and a material of HT20-40. It requires hydrostatic test and maintains a pressure of 3-4 kg / cm 2 for three minutes. Hydrostatic test found that the screw hole column have different degrees of water leakage, anatomical analysis, mainly due to shrinkage and shrinkage caused, the rejection rate as high as 74%, in view of this situation, has adopted a variety of methods to eliminate casting defects , But because the effect is not significant and not completely solved. The simulation analysis confirmed that: the formation of shrinkage and shrinkage is mainly due to the upper and lower walls and the thickness of the screw hole column difference, especially because the sand core is surrounded by hot metal, screw holes