刀齿瞬时切削能耗是评价高效铣刀动态切削性能的重要指标。已有的铣刀切削能耗解算模型中缺乏瞬时切削能耗在刀齿切削刃上的分布信息，无法准确识别切削刃不同位置瞬时切削状态的复杂性和多变性。针对由于切削边界不确定导致无法准确识别切削刃瞬时切削能耗分布区域的问题，提出主副切削刃瞬时边界的解算方法,获得振动与磨损作用下的主副切削刃方程。建立瞬时切削能耗分布及其分形维数的解算模型，获得瞬时切削能耗在刀齿上的分布情况。提出切削能耗动态分布特性识别方法，利用分形维数的极值、变异系数与一阶差分，揭示不同刀齿瞬时切削能耗分布的动态特性，并利用铣削加工表面形貌与刀齿后刀面磨损深度实验结果进行验证。
Abstract
The instantaneous cutting energy consumption of the cutter teeth is an important indicator for evaluating the dynamic cutting performance of efficient milling cutters. The existed milling cutter cutting energy consumption solution model lacks of the distribution information of the instantaneous cutting energy consumption on the cutting edge of the cutter teeth, and cannot accurately identify the complexity and variability of the instantaneous cutting state at different positions of the cutting edge. Aiming at the problem that the distribution area of the instantaneous cutting energy consumption of the cutting edge cannot be accurately identified due to the uncertainty of the cutting boundary, a solution method for the instantaneous boundary of the main and secondary cutting edges is proposed to obtain the equations of the main and secondary cutting edges under vibration and wear. A solution model for the instantaneous cutting energy consumption distribution and its fractal dimension is established to obtain the distribution of the instantaneous cutting energy consumption on the cutter teeth. A method for identifying the dynamic distribution characteristics of cutting energy consumption is proposed. The extreme value, coefficient of variation and first-order difference of the fractal dimension are used to reveal the dynamic characteristics of the instantaneous cutting energy consumption distribution of different cutter teeth, and the experimental results of milling surface morphology and tooth flank wear depth are used to verify the proposed method.
关键词
高效铣刀 /
刀齿 /
主副切削刃 /
瞬时切削能耗 /
分形维数
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Key words
high efficiency milling cutter /
cutter tooth /
major and minor cutting edges /
instantaneous cutting energy consumption /
fractal dimension
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