无冒口铸造球墨铸铁件

• 作 者: M.坦科斯佐尼 V.戈吾迪克 何本谦
• 出 处: 机械科技动态
• 发表日期: 1978年02期
• 关键词: 无冒口铸造 球铁 球墨铸铁件 球状石墨 体积 奥氏体 液态 铸造工作者 铸件 球铁件

由于球铁的收缩比其他铸铁少,铸造工作者一直在试验无冒口浇注铸件的工艺,以提高生产率,减少清理和废料。本文概述了近年来一些关于无冒口铸造球铁的研究问题。当球铁凝固时,随着富铁相或奥氏体的形成随之体积减少。与此同时,球状石墨的长大又增加了体积(由于它们的特殊体积相对于它们在液态时大所引起的)。因而,要是由于液态冷却和奥氏体生长所引起的体积减少能相等于石墨长大所增加的体积,那

As ductile iron shrinks less than other cast iron, foundry workers have been experimenting with a process for casting castings without risers to increase productivity and reduce cleanup and scrap. This article summarizes some recent research questions about the casting of ductile iron without risers. As the iron cools, the volume of iron-rich phase or austenite decreases with volume. At the same time, the growth of spherical graphite increases the volume (due to their special volume relative to their large liquid state). Thus, if the volume reduction due to liquid cooling and austenite growth equates to the increased volume of graphite growth, then