生产锡青铜离心铸造件时,有时会在开口端铸件自由表面出现喇叭状穿透气孔缺陷。 产生这种缺陷的原因在涂料、模具和操作三方面,与离心铸造工艺各参数完全无关。 使用涂料时,作为粘接剂的水玻璃比例不当又未完全干燥硬化;涂料与模具粘附不牢,涂料层与模具之间出现极难察觉的细微间隙;旧涂料未彻底清除又上新涂料;涂料层与模具之间出现锈蚀层又未作彻底清洁;使用油性涂料时,未彻底去除其中的水份; In the production of bronze centrifugal castings, there are occasional flared through holes on the free surface of the open castings. The reasons for this defect in the paint, mold and operation of the three aspects, and centrifugal casting process has nothing to do with the parameters. The use of paints, water glass as an adhesive improperly proportioned and not fully dry and hardened; paint and mold adhesion is not strong, the coating layer and the mold between the subtle gap was noticed; the old paint is not completely clear the new paint ; Rust layer between the coating layer and the mold has not been thoroughly cleaned; the use of oil paint, the water is not completely removed;