Scholarlink

<p>In response to the problems of low rock-breaking efficiency, severe fatigue damage of cutting teeth, and shortened service life of drill bits caused by impact dynamic loads and unstable cutting motions in complex drilling conditions such as high-hardness, heterogeneous formations, and directional drilling, this paper proposes an impacting-cutting separated composite rock-breaking method with independent “impacting” and “cutting” actions. The performance of this method was verified through comparative analysis of numerical simulations and experimental tests on conventional cutting and composite cutting rock-breaking. The results show that the impact of impact teeth can pre-fracture rocks, reduce the rock strength around impact craters and the peak stress on cutting tooth surfaces, and improve the wear resistance of cutting teeth. Meanwhile, it forms residual stress and crushable zones around impact craters, reducing rock-breaking specific energy and enhancing rock-breaking efficiency. In addition, rock strength, impact force, rake angle, and cutting depth are the main factors affecting rock-breaking performance. When cutting high-strength limestone with an impact force of 1200&#xa0;N, cutting depth of 1.6&#xa0;mm, and rake angle of 15°, the rock-breaking specific energy is 18.17&#xa0;J, representing a reduction of over 40% compared to the energy consumption of conventional cutting rock-breaking. This study provides a theoretical support for the industrialization and application of impacting-cutting separated drill bits, and offers technical references for improving the drilling efficiency of new drill bits in deep hard-to-drill formations and shortening the deep resource development cycle.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanism and Experimental Study of Impacting-Cutting Separated Composite Rock-Breaking

  • 期刊论文

  • 发表日期：

    2026年3月11日

查看全文
  • Jiangtao Zheng,
  • Haitao Ren,
  • Tianen Liu,
  • Jianlin Yao,
  • Yingxin Yang,
  • Qingliang Qi,
  • Jingwei Xu

摘要

In response to the problems of low rock-breaking efficiency, severe fatigue damage of cutting teeth, and shortened service life of drill bits caused by impact dynamic loads and unstable cutting motions in complex drilling conditions such as high-hardness, heterogeneous formations, and directional drilling, this paper proposes an impacting-cutting separated composite rock-breaking method with independent “impacting” and “cutting” actions. The performance of this method was verified through comparative analysis of numerical simulations and experimental tests on conventional cutting and composite cutting rock-breaking. The results show that the impact of impact teeth can pre-fracture rocks, reduce the rock strength around impact craters and the peak stress on cutting tooth surfaces, and improve the wear resistance of cutting teeth. Meanwhile, it forms residual stress and crushable zones around impact craters, reducing rock-breaking specific energy and enhancing rock-breaking efficiency. In addition, rock strength, impact force, rake angle, and cutting depth are the main factors affecting rock-breaking performance. When cutting high-strength limestone with an impact force of 1200 N, cutting depth of 1.6 mm, and rake angle of 15°, the rock-breaking specific energy is 18.17 J, representing a reduction of over 40% compared to the energy consumption of conventional cutting rock-breaking. This study provides a theoretical support for the industrialization and application of impacting-cutting separated drill bits, and offers technical references for improving the drilling efficiency of new drill bits in deep hard-to-drill formations and shortening the deep resource development cycle.