Percussion rock drills have been widely used in mine development and civil engineering. During percussive rock drilling, a hammer in the rock drill collides with a shank rod several thousand times per minute, and elastic waves generated by the collisions propagate in the shank rod, rods, and a bit. Cemented carbide buttons, which are embedded in the bit, are penetrated into rock by the elastic waves. The penetration process of a bit into rock is represented by the relation between the force applied to the bit and the penetration depth, which is called a force-penetration curve. To estimate drilling rate and efficiency and to reproduce the drilling processes in computer simulation, it is indispensable to obtain appropriate force-penetration curves for the button bit. In this study, a new test apparatus was developed to conduct a single blow penetration (SBP) test and a consecutive blow penetration (CBP) test using an actual rock drill. The CBP test was conducted under conditions close to actual percussive rock drilling. Force-penetration curves for a button bit were obtained from the SBP and CBP tests with a block of granite using the correction method with a single blow test without the rock block. The results showed that the drilling efficiency and the linearity of the force-penetration curves in the loading phase are higher in the CBP test than in the SBP test, which indicates that the degree of contact between the bit and rock is higher in the CBP test under a thrust force and rotation than in the SBP test. In the CBP test, the force was represented by power functions of the penetration in the loading and unloading phases. On the basis of these results, the modeling method of force-penetration curves for the button bit was proposed for the simulation of percussive rock drilling.

中文翻译：

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冲击式凿岩过程中产生的柱齿钻头的力-穿透曲线


冲击凿岩机已广泛应用于矿山开发和土木工程。在冲击式凿岩过程中，凿岩机中的锤子每分钟与镂杆碰撞数千次，碰撞产生的弹性波在镐杆、杆和钻头中传播。嵌入钻头中的硬质合金柱齿通过弹性波穿透岩石。钻头钻入岩石的过程由施加在钻头上的力与钻入深度之间的关系表示，称为力-钻探曲线。为了估计钻孔速率和效率并在计算机模拟中重现钻孔过程，必须获得适当的柱齿钻头的力-穿透曲线。在本研究中，开发了一种新的测试设备，用于使用实际凿岩机进行单次打击触探 （SBP） 测试和连续打击触探 （CBP） 测试。CBP 测试是在接近实际冲击凿岩的条件下进行的。柱齿钻头的力-穿透曲线是从 SBP 和 CBP 测试中获得的，该测试使用校正方法对花岗岩块进行校正方法，在没有岩石块的单次打击测试中。结果表明，CBP 试验中加载阶段的钻进效率和力-刺入曲线的线性度高于 SBP 试验，这表明 CBP 试验中在推力和旋转作用下钻头与岩石的接触程度高于 SBP 试验。在 CBP 测试中，力由装卸阶段穿透的幂函数表示。 基于这些结果，提出了柱齿钻头力-刺入曲线的建模方法，用于冲击式凿岩的模拟。