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本文采用快速落刀法、同时辅以测温试验以获得在自由直角切削情况下的若干切屑根部并做成显微金相磨片。用金属显微镜或从金相磨片的照片上测出积屑瘤的高度、底面长度和积屑瘤前角等参数从而定量分析了车削不锈钢时,切削速度、切削厚度和刀具前角对积屑瘤、切削温度的影响。本文根据实验结果指出了用W18Cr4V高速钢刀具加工1Cr18Ni9Ti不锈钢时,形成积屑瘤的速度范围为V=2～27米/分(当a_c=0.067～0.17mm时)。同时还测出对应于积屑瘤消失时的切削温度为500～520℃,而对应于积屑瘤高度达最大值时的切削温度为300℃左右。并指出加工奥氏体不锈钢时,当刀具前角γ_o>30°时不形成积屑瘤。本实验利用自然热电偶法配合光线示波器动态记录了各种切削条件下切削温度的变化。并用回归分析法整理出用高速钢刀具自由干切削1Cr18NiSTi钢时计算切削温度的指数公式。
In this paper, the rapid fall knife method, supplemented by temperature test to obtain a number of free rectangular root cutting conditions and made microscopic metallographic grinding. Using a metal microscope or a photograph of the metallographic disc, the height, bottom length and litter edge of the BUE were measured to quantitatively analyze the effect of cutting speed, cutting depth and tool rake angle on chip dust Tumor, the impact of cutting temperature. According to the experimental results, it is pointed out that the rate of formation of BUE is V = 2 ~ 27 m / min (when a_c = 0.067 ~ 0.17mm) when using 1Cr18Ni9Ti stainless steel with W18Cr4V HSS tool. At the same time, the cutting temperature corresponding to the disappearance of BUE was measured from 500 to 520 ° C, and the cutting temperature corresponding to the maximum value of BUE was about 300 ° C. And pointed out that the processing of austenitic stainless steel, when the tool rake γ_o> 30 ° does not form the BUE. The experiment uses natural thermocouple method with light oscilloscope to dynamically record the cutting temperature changes under various cutting conditions. And using regression analysis to sort out the high-speed steel tool free cutting 1Cr18NiSTi steel cutting temperature when calculating the index formula.