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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第10期    总第278期    2017年10月

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文章编号:1672-7207(2017)10-2709-06
冲击诱导损伤岩石的切削特性
吴万荣1, 2,娄磊1, 2,梁向京1, 2

(1. 中南大学 高性能复杂制造国家重点实验室,湖南 长沙,410083; 2. 中南大学 机电工程学院,湖南 长沙,410083)

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。

 

关键字: 牙轮钻;冲击诱导;裂纹密度;侵入系数

Cutting features of damage rock by shock disturbance
WU Wanrong1, 2, LOU Lei1, 2, LIANG Xiangjing1, 2

1. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China; 2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Abstract:In order to improve the drilling efficiency and reduce tools wear, a new rock fragmentation method of shock disturbance was presented. Based on the theory of Walsh, the crack model of the damaged rock around the induced hole was established, the intrusive coefficient equation of cone bit was derived, and the drilling rate model around the induced hole was built. The influence of crack density and the disturbance frequency on the elastic modulus, intrusive coefficient and the cutting force was studied. The results show that with the increase of crack density, the effective elastic modulus decreases and the intrusive coefficient decreases. Under a certain range of internal friction angle, the penetration rate increases obviously with the increase of the crack density. Under the condition of certain axial load, the cutting force of the one-cone bits decreases obviously with the increase of the disturbance frequency.

 

Key words: one-cone bits; shock disturbance; crack density; intrusion coefficient

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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