Loading tests of retaining tricone bit bearing using physical model

Tricone bits are currently less commonly used as compared with PDC bits. mainly in drilling difficult geotechnical conditions and blasthole open pit mines. The main disadvantage of tricone is the relatively short life. cause age limit failure retaining ball bearing due to destruction raceway journal shoulder under high contact bending stresses. Based on provisions similarity theory, physical model drill bit has been manufactured. paper presents data testing using a friction wear machine, namely, temporal variations temperature, frictional torque clearances bearings. temperature heat rating related. In extreme operation at deficiency lubrications, stresses rings balls bearing, well their temperatures exceed greatly allowable values. authors propose procedure engineering roller bit. study was carried out framework state contract between Ministry Science Higher Education Russian Federation Ural State Mining University.