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切削韧性和耐磨性是刀具材料发展中的一对主要矛盾。目前涂层硬质合金刀片的耐磨性大大优于非涂层基体硬质合金刀片,而切削韧性却有所下降。不同的涂层厚度,不同的涂层材料和不同的基体材料对涂层刀片切削韧性的影响程度亦有所不同。 本文从探讨涂层刀片的破损机理入手,分析了涂层刀片切削韧性下降的原因;推导了涂层刀片表面残余应力σ_R的计算公式;提出了基体材料必须具备较高的断裂韧性K_(1c),进而寻求提高涂层刀片切削韧性的途径;并用断裂力学理论定量试算了最佳涂层厚度。
Cutting toughness and wear resistance is the development of tool materials a major contradiction. At present, the wear resistance of coated carbide inserts is much better than that of non-coated carbide inserts, but the cutting toughness is decreased. Different coating thickness, different coating materials and different substrate materials have different degrees of influence on the cutting blade toughness. In this paper, the fracture mechanism of the coated blade is discussed. The reasons for the decrease of the cutting toughness of the coated blade are analyzed. The formula for calculating the residual stress on the surface of the coated blade is deduced. The matrix material must have high fracture toughness K_ (1c) , And then seek ways to improve the cutting blade toughness of the fracture; and fracture mechanics theory quantitative trial of the optimal coating thickness.