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1 前言 将金属切削刀具等工件置于-196℃的液氮中进行深冷处理,可以使工件的耐磨性、韧性、刀具的耐用度等得到明显的改善。为此,深冷处理在国际上已得到愈来愈广泛的应用,特别是在美国已出现了数家专业公司,专门为客户深冷处理各种刀具,同时也出售一些已深冷处理的刀具。据这些厂商的报导刀具冷处理后,刀具的耐用度视不同的刀具材料,可有100％～300％的提高。但是,深冷处理的工艺过程,如冷却速度、保冷时间、升温速度,都是用计算机严格控制的,而且各厂又严格保密,他人不得而知。国内如要按国际上所达到的水平进行这方面
1 Introduction Metal cutting tools and other workpieces placed in liquid nitrogen at -196 ℃ for cryogenic treatment, can make the workpiece wear resistance, toughness, tool durability has been significantly improved. To this end, cryogenic treatment has been more and more widely used in the world, especially in the United States there have been several specialized companies, specifically for customers cryogenic processing of various tools, but also for sale some cryogenic processing tools. According to these manufacturers reported tool cold treatment, tool durability depending on the tool material, can be 100% to 300% increase. However, cryogenic treatment process, such as cooling rate, cooling time, heating rate, are strictly controlled by the computer, but also strictly confidential plants, others are not aware of. In the Mainland, we should conduct this work according to the level reached in the world