WEAR MECHANISMS DUE TO DIFFERENT ROCK DRILLING CONDITIONS

摘要: AbstractDepending on the type of rock and drilling procedure used in drilling, cemented carbide is exposed to greatly differing mechanical thermal conditions. These influence properties required. By means metallographical examination drill inserts under different conditions, it has been possible determine what wear mechanism critical each case. Two kinds mechanisms particular were found have a great performance. When run conditions high stress temperature, which condition present when highly abrasive rocks, major factor influencing performance creep resistance carbide. One way improving this property appears be increase grain size. Percussive low-abrasive rock, where moderate, gives rise another mechanism. In this, stresses are induced lead fo...