A new process using alkaline resin sand mould is introduced and the cause for the improvement of quality by this new process is discussed.
英
美
释义
介绍了用碱性酚醛树脂自硬砂工艺代替呋喃树脂自硬砂工艺后消除缺陷、提高球铁曲轴品质的机理。
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