摘要
从铸造工艺、工装设计上进行改进创新,采用横向翻转浇注工艺铸造耐压外壳铸件。铸件在凝固过程中能从冒口不断地得到液态金属的补充,实现定向凝固。减少铝液二次氧化带来的夹渣,使铝液充型过程平稳,不易发生紊流。解决了铸件法兰密封面弥散性针孔和铸件轴密封处及凸台因壁厚不均产生缩松造成气密性差的问题。在实际铸造过程中通过对模具预热温度、合金浇注温度、翻转速度进行控制,提高了铸件整体质量。通过几年批量生产验证,一次检漏合格率达到99.8%。
Through the improvement on casting process, the horizontal tilting metal mould casting technique has been adopted to produce Al alloy pressure-tight shells. During the solidification of castings, due to the mold tilts on tiltable casting machine allowing the metal from riser to fill the cavity ceaselessly and directional solidification, Al liquid could fill mold steadily, and turbulent flow was not easy to occur. In addition, combined with other some measures such as controlling pouring temperature, mould preheating temperature and rotation rate of machine, etc., the dispersed shrinkage caused by wall unevenness at boss and dispersed pinhole defects at flange sealing face can be eliminated. The technique has directly been applied to the mass production of aluminum alloy pressure-tight shells. By leakage test for these shells produced by the technique for several years, the pass rate of castings can reach 99.8%.
出处
《铸造》
CAS
CSCD
北大核心
2008年第2期181-183,共3页
Foundry
关键词
横向翻转
铸造工艺
金属型
铝合金
耐压外壳铸件
technique of horizontal tilting
casting technique
mold
aluminum alloy
, pressure-tight shell