异形三通阀体砂型铸造工艺

摘要

用于某船舶产品的三通阀体,铸件壁厚相差悬殊,有4.5 MPa的液压试验要求.阀体原设计牌号为锡青铜ZCuSn10Zn2,过去生产时泵漏率曾达到60%以上.对阀体结构进行分析,并对锡青铜ZCuSn10Zn2与硅黄铜ZCuZn16Si4在海水中的耐蚀性进行比较,结果表明:在砂型铸造条件下,硅黄铜ZCuZn16Si4比锡青铜ZCuSn10Zn2更适合制造壁厚悬殊、有较高泵压要求的阀体,并获得设计单位同意由硅黄铜替代锡青铜.研究了硅黄铜三通阀体的砂型铸造工艺,成功进行了批量生产,泵漏率降低到8%以下.%The triple valve body is a part of ship, there is a great difference in casting wall thickness, and the hydraulic test requirement of 4.5 MPa is required. The original design material of the triple valve body is the tin bronze ZCuSn10Zn2, the pump leakage rate has reached more than 60%%. This paper analyses the structure of the triple valve body, and the ZCuSn10Zn2 tin bronze and silicon brass ZCuZn16Si4 in seawater corrosion resistance were compared. The result shows that under the sand casting conditions, silicon brass ZCuZn16Si4 is more suitable for the thickness wall triple valve body than tin bronze ZCuSn10Zn2, can meet higher pump pressure requirements. The sand casting process of silicon brass triple body was discussed, and the mass production was successfully carried out, and the leakage rate was less than 8%.