变速器壳体消失模铸件硬度偏低的控制
Improvement of Low Hardness of Gearhousing in LFC
张玉松
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作者单位：陕西法士特集团 铸造公司，陕西 宝鸡 722409
中文关键字：硬度； 化学成分； 孕育处理； 冷却速度； 铸造生铁
英文关键字：hardness; chemical composition; modification treatment; cooling speed; casting pig iron
中文摘要： 采用消失模铸造工艺生产重型变速器壳体，在生产过程中发现铸件存在硬度偏低现象。通过工艺试验从铸造工艺和原材料质量两方面进行原因查找，获得了现有生产条件下造成硬度偏低的原因。通过采取相应的控制措施，杜绝了硬度偏低现象的发生。
英文摘要：The gearhousings were produced by LFC, it was found that the castings have low hardness in production.Trough technological test, the reason of low hardness was checked from two aspects:the casting process and raw material, so the reason was obtained.The phenomenon of the low hardness was avoided by using corresponding measures.