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众所周知,冷铁有三个方面的主要作用:配合冒口,对冒日起增益作用;对铸件起热平衡作用,以防止铸件的变形和裂纹;改善铸件局部组织,满足其特殊应用条件。 资料介绍,在灰口铸铁和球墨铸铁件上应用时,外冷铁(以下简称冷铁)的厚度(T_冷)应小于铸件的热节厚度(T_热),即T_冷/T_热为0.3～1.0,这种观点认为厚大的冷铁会使球铁铸件放冷铁的部位呈白口组织,影响铸件材质均一性及其加工性能等。
As we all know, the main function of chill iron has three aspects: with the riser, the role of risers to take advantage of; play a thermal equilibrium role in casting to prevent the deformation and cracking of castings; to improve the local organization of castings to meet their special application conditions. Information, gray cast iron and ductile iron castings on the application, the outer cold iron (hereinafter referred to as cold iron) thickness (T_ cold) should be less than the thickness of the hot section of the casting (T_ heat), that is, T_cool / T _ Heat 0.3 ~ 1.0, this view that the thick chilled iron ductile iron ductile iron parts will be white parts of the organization, affecting the uniformity of the casting material and its processing performance.