汽车缸体铸件气孔缺陷及改进措施

nalysis on Blowhole in Automobile Cylinder Castings and Improving Measures

针对汽车缸体铸件气孔缺陷的问题,在分析某型汽车缸体铸件结构特点和原铸造工艺及质量情况的基础上,探究了缸体铸件气孔缺陷产生的原因,提出减少排气量、增加排气通道、优化浇注系统的方案,经优化后,增加排气面积6 488 mm2,控制金属液浇注温度为1 420~1 440℃,缩短浇注时间为24~26 s。结果显示,经优化后,汽车缸体铸件气孔缺陷明显减少,内废率由5.11%下降到1.93%,外废品率由3.94%下降到2.11%。

Aimed at the casting porosity problem of automobile cylinder block, based on analysis of the structure of a certain type of auto castings and the original casting process, the causes of cylinder block casting porosity was explored,and a scheme to reduce exhaust volume, increase the exhaust channel, optimization of gating system was proposed. After optimization, the scheme increase the exhaust area 6488 mm2, control the pouring temperature of 1420 ~1440 ℃, shorten the casting time of 24~26 s. The process after optimization show that the blowhole defects in automobile cylinder block castings reduce obviously, internal scrap rate reduces from 5.11% to 1.93%, and external scrap rate decreases from 3.94%to 2.11%.