论述了高锰钢的低温脆性，建立了用液氮冷冻工件的低温切削方法。
The brittleness of high-manganese steel under low temperature is discussed. A method of Iow-temperature cutting with liquid nitrogen freezing of the workpiece has been developed.
作为一门新技术，冷冻加工为某些特殊难加工金属材料开辟一条有效的切削途径。
As a new technology, freeze cutting has fond a effective cutting way for some intractable metals and has application value for the machining of the special industry.
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