冲击诱导损伤岩石的切削特性

发布时间：2018-06-14 17:12

  本文选题：牙轮钻 + 冲击诱导　； 参考：《中南大学学报(自然科学版)》2017年10期

【摘要】：为了提高硬岩矿山开采时牙轮切削钻孔效率,降低钻具磨损,提出冲击诱导切削复合破岩新方法。在Walsh模型的基础上,建立冲击诱导孔周围岩石损伤区的裂纹模型,推导岩石损伤区的牙轮钻齿侵入系数方程及牙轮钻速方程,分析裂纹密度和扰动频率分别对岩石弹性模量、钻齿侵入系数和钻齿切削力的影响。研究结果表明:随着裂纹密度增大,岩石的有效弹性模量减小,侵入系数逐渐减小;在一定内摩擦角范围内,随着裂纹密度增大,牙轮钻速显著提高;在相同轴向载荷条件下,随着冲击扰动频率增大,牙轮钻齿切削力逐渐减小。
[Abstract]:In order to improve the drilling efficiency and reduce the wear of drilling tools in hard rock mining, a new method of combined rock breaking by impact induced cutting is put forward. On the basis of Walsh model, the crack model of rock damage zone around the impingement induced hole is established, and the invading coefficient equation and drilling speed equation are derived, and the elastic modulus of rock is analyzed by crack density and disturbance frequency, respectively. The influence of penetration coefficient and cutting force of drilling teeth. The results show that with the increase of crack density, the effective elastic modulus of rock decreases and the invasion coefficient decreases, and in a certain range of internal friction angles, the drilling speed increases significantly with the increase of crack density, and under the same axial load, the effective elastic modulus of rock decreases with the increase of crack density, and the penetration coefficient decreases gradually with the increase of crack density. With the increase of perturbed frequency, the cutting force decreases gradually.
【作者单位】： 中南大学高性能复杂制造国家重点实验室;中南大学机电工程学院;
【基金】：国家自然科学基金资助项目(51774340) 高性能复杂制造国家重点实验室基金资助项目(zzyjkt2015-03)~~
【分类号】：TD313
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本文编号：2018293