切削角度对切削齿温度分布的影响分析

Influence of Cutting Angle on Temperature Distribution of Cutter

切削齿失效与切削温度有密切联系,岩屑的形成对切削齿的性能和寿命都存在影响。为此,建立了岩石破碎力学模型,对切削齿进行了破岩模型数值模拟分析,通过岩石切削仿真研究了不同切削深度下,切削角度对岩石破碎模式和温度波动程度的影响规律。研究结果表明:岩屑粒度随切削角度的增大而减小,切削角度的增加会加剧岩屑在前刀面的累积;当切削角大于临界值,温度以及温升速率随切削角的继续增大而减小,后刀面与岩石的摩擦作用随切削角度的增大而减弱,切削齿后刀面温度降低;当切削深度小于临界值时,切削角度宜为5°~10°,既能使切削齿温度较低,又能提高切削齿破岩效率;当切削深度大于临界值时,切削角度宜为20°~25°,既能增强切削齿的强度,又能延长切削齿的使用寿命。研究结论可为破碎岩石施工降本增效提供理论依据。

The failure of cutter is closely related to cutting temperature,and the formation of cuttings has an impact on the performance and life of cutter.This article builds a rock-breaking mechanics model to conduct numerical simulation analysis on rock breaking of cutter,and uses rock cutting simulation to study the influence of cutting angle on rock breaking mode and temperature fluctuation at different cutting depths.The study results show that the particle size of cuttings decreases with the increase of cutting angle,and the increase of cutting angle will aggravate the accumulation of cuttings on the rake face;when the cutting angle is greater than the critical value,the temperature and temperature rise rate decrease with the increase of cutting angle,the friction between flank face and rock decreases with the increase of cutting angle,and the temperature of flank face of cutter decreases;when the cutting depth is smaller than the critical value,the cutting angle should be 5°~10°,and when the cutting depth is greater than the critical value,the cutting angle should be 20°~25°.The study conclusions provide a theoretical basis for cost reduction and efficiency improvement of rock breaking construction.