141气缸盖铸件铸造缺陷的防止措施

Prevention Measures of 141 Cylinder Head Casting Defects

介绍了利用原生产工艺生产的141气缸盖铸件所出现的砂眼、渗漏、缩松和气孔等缺陷,并指出了出现各铸造缺陷的部位,统计发现气孔占总缺陷的81%。通过以下工艺进行改进:将#2芯中心4根通气针尺寸进行改进,并加强封火;将#2砂芯两端通气针周围的压砂环加深;组装砂芯时,#1、#2、#3芯头间隙抹封火泥;将#2芯与#1芯侧面配合处扎2个出气孔,装配时2芯头孔内加1个石棉垫;取消#2芯盒圆芯头排气道,加强封火效果;用直径21 mm石棉垫取代直径18 mm石棉垫进行封火。最终解决了141气缸盖上述缺陷,产品的废品率由31%降低至6.5%左右,挽回了企业质量信誉,取得了较好的经济效益。

The casting defects of trachoma,leakage,shrinkage and porosity under original production technology of 141 cylinder head were introduced. The casting defects location was recorded and that indicated porosity take 81% of all defects.The following process were made to improve that. All 4 vent line were improved in size and heat isolation. The pressure sand ring was deeper and fireclay was added to the space between each core head. Two vent holes were added on the side of #2and #1 core side and an asbestos mat was installed in the hole of core head. The vent line on round #2 box core head was cancelled to increase heat isolation. The size of asbestos pad was increased from 21 mm diameter to 18 mm. As a result,the defects were under control and that make the scrap rate drop from 31% to about 6.5%. Quality reputation of enterprise was saved and good economic results was achieved.