【摘要】 通过调整钢水的碳含量及变质处理 ;采用合适的浇冒系统和外冷铁 ;执行既定的工艺操作规程 ;可使钻机转盘体铸件的质量明显提高更多还原

【Abstract】 Through adjusting the carbon content and modifying in the steel liquid, useing reasonable gate and riser systems and external iron chill,following the designated technology operating instruction,the quality of the drilling machine swivel Disc box steel castings is raised obviously.更多还原