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对离心铸造ZA2 7合金轴套废品进行分析发现 ,因气孔造成的废品高达 90 % ,气孔主要来自涂层中的结晶水及粘结剂、悬浮剂等易挥发成分。通过改进工艺方案 ,控制浇注温度在 60 0℃左右 ,提高铸型的预热温度至 2 0 0℃ ,在铸型外模钻孔并扩大挡板孔径 ,增大了气体排气的通道。这样使气孔率大大降低 ,铸件废品率小于 5 % 。
Analysis of centrifugal cast ZA2 7 alloy bushings found that the fouling mainly comes from the coating water and the volatile components such as binders and suspending agents due to the fouling caused by the pores up to 90%. By improving the process scheme, the pouring temperature is controlled at 60 0 ℃, the preheating temperature of the mold is raised to 200 ℃, and the bores are drilled in the outer mold of the mold to enlarge the baffle aperture and increase the gas exhaust passage. This greatly reduces the porosity, casting reject rate of less than 5%.