TEST AND INSTALLATION OF ROCK CUTTING DRILL BIT ELEMENTS WEAR THROUGH AN ABRASIVE LAYER

Abstract

Based on the technical and patent literature the article analysis the systems of installations for abrasive material wear test and proposes an improved construction that provides approximation of test conditions to the real operation conditions of rock cutting drill bit elements by dynamic loads, the ability to change the impact angle of an abrasive on a sample and abrasive pressure distribution on the sample surface. The installation contains the reference ring coaxially inserted inside the annular element. The sample holder is made as a carrier with the axis of rotation, which coincides with the axis of the annular element, has electrical drive and provides circle movement of a sample between the reference and circular element. Sample loading mechanism is designed as a spring-loaded wedge inserts with guides, evenly spaced in a circle in the annular element. The sample interacts with the reference ring and spring-loaded wedge inserts through an abrasive layer, which is given from the hopper to the friction zone. The magnitude of the sample wear is gravimetrically determined.