TY - JOUR
AU - Medvedev, I.
AB - BIT LIFE AND POWER REQUIREMENTS IN ROTARY-PERCUSSIVE SHOTHOLE DRILLING I. F. Medvedev UDC622.233.3.051 Extemive measurement of wear on the cutting edges of rotary-percussive drilling bits has shown that they are exposed to impact-load wear over the side edges (leading and trailing), while the end faces of the blade are exposed to static and peripheral forces. Where the impact energy and axial feed force are correctly selected for a particular rock hardness, the profile of the face blunting should approach a fiat profile or the profile of blunting in rotary drill- ing. Hard-metal wear at the end faces of the blade in the bit due to the impact load will always be in advance of wear due to static and peripheral forces, i.e., hard-metal wear from impact loads always reduces the width of the face area of the blunted part; it therefore increases the penetration depth and has no effect on the intemity of wear on the end face part of the bit blade. Axial and peripheral forces in a rotary-percussive drilling system are continuous, whereas the impact load is intermittent. Hence it follows that the size and nature of the operative forces governing the wear of the cutting edges 
TI - Bit life and power requirements in rotary-percussive shothole drilling
JF - Journal of Mining Science
DO - 10.1007/BF02497917
DA - 2006-09-01
UR - https://www.deepdyve.com/lp/springer-journals/bit-life-and-power-requirements-in-rotary-percussive-shothole-drilling-ftW0wCYZlC
SP - 604
EP - 608
VL - 3
IS - 6
DP - DeepDyve
ER -