Study Of Coal Fragmentation Under Conical Bit Indentation

Jung, S. J.
Organization: International Conference on Ground Control in Mining
Pages: 8
Publication Date: Jan 1, 1989
A fundamental study of fragment size distribution and characteristics of fracture pattern is presented for the dynamic penetration of a conical bit into coal block. In this paper, damaged zones during crater formation and fragment size distribution were studied. Bit with a sharper tip angle and a smooth body configuration performed better penetration. Results suggest that in coal cutting the trend should be toward the face cleat direction using a sharper angled tip bits which consumes less energy for an optimum range of penetration depths, thus attaining maximum cutting efficiency and reducing fine fragments.
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