Single-cone bit are an important tool for slim-hole drilling. In view of the problems of drilling with a spherical single-cone bit, a new non-spherical single-cone bit is designed that breaks rock by impacting and scraping. The field experiment test show that the tooth at the small end of the cone was severely worn, and the tooth at the large end of the cone was minimally worn. To determine the cause of the eccentric bit wear, the tooth breaking rock was simulated using the finite element method. The tooth load, the cutting trajectory shape of each tooth, and the contact time between the tooth and rock were analysed. The theoretical model of tooth wear calculation was derived and compared with experimental results. The results showed that the tooth load at the large end of the cone was greater than the tooth load at the small end of the cone, but the contact time at the small end of the cone was longer. The field test results showed that the No. 6 tooth wear was small, and No.1, No.4 and No.5 was smaller. The No.3 tooth was the most severely worn. The results from theoretical model were consistent with the field test results indicating that the tooth wear theory formula can predict tooth wear.

单锥钻头是进行细孔钻探的重要工具。鉴于使用球形单锥钻头进行钻探的问题，设计了一种新的非球形单锥钻头，该钻头通过撞击和刮擦来破碎岩石。现场实验测试表明，圆锥小端的牙齿磨损严重，圆锥大端的牙齿磨损最小。为了确定偏心钻头磨损的原因，使用有限元方法对断齿岩石进行了模拟。分析了牙齿的载荷，每个牙齿的切割轨迹形状以及牙齿与岩石之间的接触时间。推导了齿磨损计算的理论模型，并与实验结果进行了比较。结果表明，圆锥大端的齿负载大于圆锥小端的齿负载，但在圆锥体小端的接触时间更长。现场测试结果表明，6号齿磨损较小，1号，4号和5号齿磨损较小。3号牙齿磨损最严重。理论模型的结果与现场测试结果一致，表明牙齿磨损理论公式可以预测牙齿磨损。