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Abstract <p>A double-layer design has been developed for the cutting insert of drill tools by using the WC–Co hard alloy with different cobalt content and tungsten carbide grain size with a sharp boundary between zones of different granularity to increase the wear resistance and impact strength of tools and the rate of percussive rotary drilling in hard rocks up to 50%. The upper layer of the cutting insert is composed by a coarsely grained structure (6 µm), and the lower layer represents a finely grained structure (2 µm) with an increased fracture toughness. The results of this study can be used in mining, oil and gas, and building industries to improve drilling efficiency.</p>

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Improving Drilling Technology in Percussive Rotary Drilling

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Ye. A. Koroviaka,
  • S. O. Shypunov

摘要

Abstract

A double-layer design has been developed for the cutting insert of drill tools by using the WC–Co hard alloy with different cobalt content and tungsten carbide grain size with a sharp boundary between zones of different granularity to increase the wear resistance and impact strength of tools and the rate of percussive rotary drilling in hard rocks up to 50%. The upper layer of the cutting insert is composed by a coarsely grained structure (6 µm), and the lower layer represents a finely grained structure (2 µm) with an increased fracture toughness. The results of this study can be used in mining, oil and gas, and building industries to improve drilling efficiency.