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    Effects of Overused Top-hammer Drilling Bits

    Access Status
    Open access via publisher
    Authors
    Hwang, S.
    Jang, Hyong Doo
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hwang, S. and Jang, H.D. 2019. Effects of Overused Top-hammer Drilling Bits. Insights in Mining Science & Technology. 1 (2): 555558.
    Source Title
    Insights in Mining Science & Technology
    DOI
    10.19080/IMST.2019.01.555558
    Additional URLs
    https://juniperpublishers.com/imst/
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/76904
    Collection
    • Curtin Research Publications
    Abstract

    The drill bits are the foremost common consumables in the mining industry but an essential part of the rock excavation process. The management of the bit wears directly influences the drilling quality and the productivity of the mine but often overlooked as a common consumable part. The study aims to analyze the effects of overused top-hammer drilling bits to various type of bit failure modes. 341 drill bits samples (ST68-102mm) were visually investigated to check the status of overused and failures. The button chipped (BC) type of failure occurs most frequently among all other types of bit failures. Subsequently, a positive correlation between the number of grinding rounds and bit failures were found. In addition, a cost analysis was conducted to demonstrate the adverse effects of drilling with overused bits. The results explicitly show the cost loss of using overused bits as the cost per metre (CPM) of 75% flat bits calculated to 3.1 AUD per metre while the CPM stays at 1.6 AUD per metre for using rock bits with 30% flat buttons.

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