CASE-STUDY OF TRIBOLOGY AT TAMPERE-UNIVERSITY-OF-TECHNOLOGY - PERCUSSIVE ROCK DRILLING TUBE

The aim of this study was to research the problem of wear localized on the thread joint of a percussive rock drilling tube. Wear of the thre ad joint causes a decrease in the tightness of the joint and increases the sensitivity of the tube to breakdown. The effect of wear of the t hread joint on the endurance of a drilling tube was studied using fail ure follow-up. As a result of failure follow-up, it was found that the endurance of a drilling tube is primarily dependent on the properties of the material used. The mechanism of wear was studied using replica s and a scanning electron microscope. Three different wear mechanisms were found in the thread joint. The prevalent wear mechanism depends o n the fixing moment of the thread joint and the location of the wear p henomenon. Impact wear can be considered to be the dominating factor i n the wear process.