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一、前言从60年代末由化学气相沉积法制造的TiC涂层硬质合金可转位刀具出现以来,经过10年的时间,物理气相沉积法制造的涂层高速钢刀具相继出现.由于各种涂层——基体结合的涂层刀具,能有效地提高刀具的使用寿命和切削速度,取得了明显的经济效益,因此,涂层刀具的研究、推广和应用,引起了人们极大的重视. 涂层刀具提高的刀具寿命和获得的切削速度能力,主要取决于涂层材料较基体材料能增加的红硬性(即高温硬度)和化学稳定性结合的程度,以及涂层材料与基体材料合适的匹配.涂层材料与基体材料的匹配种类又取决于刀具在不同场合下应用的损坏机理. 二、刀具损坏的机理刀具在金属切削加工应用中,按刀具的损坏情况,可分为切削刃的正常磨损和切削刃的异常碎裂两种.刀具切削刃的正常磨损
I. Introduction Since the emergence of TiC coated cemented carbide indexable tools manufactured by chemical vapor deposition at the end of the 1960s, coating HSS tools manufactured by physical vapor deposition have emerged over the past 10 years, The coating-matrix coated coating cutter can effectively improve the service life and cutting speed of the cutter, and has obtained obvious economic benefits. Therefore, the research, promotion and application of the coated cutter have drawn great attention. The increased tool life and the ability to obtain cutting speeds for coated tools depend primarily on the extent to which the coating material will bond to the red hardness (ie, high temperature hardness) and the chemical stability that the matrix material can increase as well as the appropriate coating material to substrate material Matching.Coating material and the matrix match the type of material in turn depends on the application of the tool in different occasions, the damage mechanism. Second, the mechanism of tool damage In metal cutting applications, according to the damage of the tool can be divided into cutting edge Normal wear and tear of the cutting edge of two kinds of abnormalities. Tool cutting edge of the normal wear and tear