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铸钢件制造过程条件都有什么?

2019-02-24 17:02:04

铸钢件对原铁液要求的碳硅含量比灰铸铁高,降低球墨铸铁中锰,磷,硫的含量,铁液出炉温度比灰铸铸件较铁更高,比补偿球化,孕育处理时铁液温度的损失,进行球化处理,即往铁液中添加球一化剂。球墨铸件流动性较差,收缩较大,因此需要较高的浇注温度及较大的浇注系统尺寸,多应用冒口,冷铁,采用顺序凝固原则,球墨铸件作为轴承需要更高的硬度,常将铸铁件淬火并低温回火处理。砂型铸钢熔模铸造是指用易熔材料制成可熔性模型,在其上涂覆若干层特制的耐火涂料,经过干燥和硬化形成一个整体型壳后,再用蒸汽或热水从型壳中熔掉模型,然后把型壳置于砂箱中,在其四周填充干砂造型,将铸型放入焙烧炉中经过高温焙烧,铸型或型壳经焙烧后,于其中浇注熔融金属而得到铸件。

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