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在以中、低速切削一些常用的塑性金属时,常常在已加工表面出现周期性分布的鳞片状毛刺,即所谓鳞刺。鳞刺的出现使被加工件的表面光洁度降低2～4级[4]。并且,由于其底部有裂口的存在、使得被加工件的疲劳强度、抗腐蚀性能、工件表面的接触刚度、另件寿命均有所下降。 (一) 鳞剌对已加工件表面质量的影响,主要是通过其外部形态来起作用的。其外部形态基本上可由两个参数来表示。1>鳞剌的高度h_L,2>鳞剌的分布密度ρ(1cm内在垂直于鳞片的方向上所测的鳞刺个数)。对不同的被加工表面,在其ρ相同的情况下,如h_L越高,则被加工件表面质量越差;在其h_L相同的情况下,如ρ越密则在单位长度上的疲劳源越多,产生疲劳破坏的概率将增大。因此,对h_L的有关规律的研究固然必要;但对ρ的有关规律的研究也不可少。它不仅为我们在实际生产中对加工件表面质量进行有效控制和综合评定提供了一
In the medium and low-speed cutting of some commonly used plastic metals, often appear in the processing surface of the periodic distribution of flaky burr, the so-called scale thorn. The appearance of the spines causes the surface finish of the workpiece to be reduced by 2 to 4 [4]. And, because of the existence of a crack at the bottom, the fatigue strength, corrosion resistance, contact rigidity of the workpiece surface and the life of the other components of the workpiece are decreased. (A) Squamata on the surface quality of the workpiece has been processed, mainly through its external form to play a role. Its external form can basically be represented by two parameters. 1> Scallion height h_L, 2> Scallion distribution density ρ (the number of scabs measured in the direction perpendicular to the scales within 1 cm). For different surface to be processed, in the same condition of ρ, the higher the h_L is, the worse the surface quality of the workpiece will be. In the case of the same h_L, if the ρ is more dense, the fatigue source per unit length More, the probability of fatigue damage will increase. Therefore, it is necessary to study the law of h_L; however, the study on the law of ρ is also essential. It not only for our actual production of the workpiece surface quality control and comprehensive assessment of a