The working conditions and requests of the roll used in high-speed wire pre -finishing mill are introduced.

介绍了高线须精轧机使用的轧辊（辊环）的工作条件和要求。

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Working condition of roller rings used in finishing roll sector or pre-finishing roll sector of high speed line or rod rolling mill production line is extremely vile.

高速线、棒材热轧生产线的预精轧段和精轧段用轧辊的工作条件十分恶劣。

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In this paper, the critical speed of the rotor system on new model high speed vertical im-pact mill is analysed with Transfer Matrix Method and the working speed of the rotor system is designed.

利用传递矩阵方法，对立式高速冲击粉碎机转子系统进行了临界转速分析；并对其工作转速进行了设计。

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