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常用浇口,胃口或辅以冷铁补缩铸件,调节铸件温度,集渣,出气,以获得无缩孔、缩松、气孔、夹渣、冷隔和防止薄壁处产生白口的致密铸件。铸铁件(球铁件和灰铁件)在一定的生产条件下,补缩用冒口放在铸件热节上会产生收缩缺陷,本文讨论了防止收缩缺陷的方法,并附应用实例。一、冒口放在热节上存在的问题铸件断面肥厚、热量集中的部位,习称“热节”。如两壁相交处,不仅断面增大,热量集中,而且尖砂散热缓慢,形成热节。热节大小以内接圆或热节圆表示,铸件上放胃口后,对热节大小也有影响。例如在一个厚度为 T 的平板上,放一个直径为 D 的明胃口,就可看出:
Common gate, appetite or supplemented with cold iron to fill castings, adjust casting temperature, set slag and gas outlet to obtain dense castings without shrinkage, shrinkage, porosity, slag inclusion, cold septa, and preventing the production of white holes at thin walls. . Iron castings (spheroidal iron and gray cast iron) under certain production conditions, feeding the riser on the hot section of the casting will cause shrinkage defects. This article discusses the method of preventing shrinkage defects and attaches application examples. First, the problem of the riser on the hot section The part where the casting section is hypertrophic and the heat is concentrated is commonly referred to as the “hot section”. If the intersection of the two walls, not only increase the cross-section, heat concentration, and sharp sand heat slowly, forming a hot section. The size of the thermal section is indicated by a circle or a hot circle. After the applicator is put on the casting, the size of the thermal section is also affected. For example, on a flat plate with a thickness of T, put a sweet appetite of diameter D to see: