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铝、镁合金在凝固过程中都有较大的液态和凝固态的线收缩和体收缩。这些合金的铸件在凝固时,如果收缩得不到补偿,就会在铸件最后凝固的部位出现缩孔和缩松。在铝、镁合金铸件的生产中,普遍采用设置冒口、增加工艺补贴,和使用冷铁激冷等有效的工艺措施,来控制铸件的凝固过程,补充铸件的收缩,防止铸件产生缩孔和缩松缺陷。
Aluminum and magnesium alloys have larger liquid and solidified linear shrinkage and bulk shrinkage during solidification. When the castings of these alloys are solidified, shrinkage and shrinkage may occur at the final solidified part of the casting if shrinkage is not compensated. In the production of aluminum and magnesium alloy castings, it is commonly used to control the solidification process of the castings, to supplement the shrinkage of the castings, to prevent the shrinkage of the castings and to prevent the shrinkage of the castings by adopting effective process measures such as setting riser, increasing process subsidies, and using chill iron quenching Shrinkage defects.