An experimental study on wearing of conical picks interacting with rock

摘要

Wearing of conical picks on a coal mining machine and roadheaders are investigated experimentally using a full-scale rotary cutting machine. This study considers three types of conical picks with different tip materials to examine the effects of wear resistance of conical picks and wear characteristics in response to cutting load. The influence of pick wear on the cutting load and pick tip temperature are analyzed, thereby providing an experimental-based guideline for reducing pick wear. The results indicate that the cemented carbide pick has the best wear resistance among the three kinds of picks studied, and the pick life can be significantly extended for picks with a wear-resistant coating surface. It is also found that pick wear has the greatest influence on the normal force. Thermal fatigue and overloading are two factors that cause pick wear failure. The results can also be used to design the conical pick with wear-resistant coating and to validate the numerical models.