侧浇底注组芯造型工艺的气缸盖气孔缺陷控制

Air Hole Defects Control of Cylinder Head Processed by Side Pouring and Bottom Injection Core Assembly Molding Technology

介绍了B3200缸盖铸件的结构,详细阐述了原工艺的生产条件及存在的法兰处气孔问题,从气孔的形貌、出现的位置及出现的箱序等方面分析了气孔缺陷产生的原因,并采取了相应的改进措施:增大直浇道底窝,加高横浇道高度,上移底层横浇道,缩短铁液流动距离,减少流动阻力,使浇注时间由原来的20 s缩短到15 s,并在工艺孔法兰位置和气道口法兰位置增加溢流片。实际生产结果显示:在生产的2万多件B3200缸盖中,气孔的废品率0.29%,总废品率0.70%,取得了较好的攻关效果。

The structure of the B3200 cylinder head casting was introduced.The production conditions of the original process and the existing air hole at the flange were explained in detail.The air hole defects were analyzed from the morphology,location and sequence.Corresponding improvement measures had been taken:increase the bottom of sprue base,increase the height of the cross runner,move the bottom runner up,shorten the flow distance of the molten iron,reduced the flow resistance,and made the pouring time drop from the original 20 s to 15 s.Overflow fins were added at the process holes flange position and airway flange position.The actual production results showed that in the production of more than 20000 piece of B3200 cylinder heads,the air hole waste rate was 0.29%,and the total waste rate was 0.70%.A good research effect had been achieved.