CUTTER -TUBULAR GOODS CONTACT EXPERIMENTAL RESEARCH

SUMMARY The paper presents the phenomenon of appearance and initiation of friction at cutter-tubular goodie contact with application for the tongs used to the drilling-production works. Drilling tongs are used for the screwing-unscrewing operation of the tubular goods: drilling piper, tubing's etc. The paper states the functioning criterion of the drilling tongs taking into consideration the influence factors: exterior factors (motive power, working medium), constructive factors (tubular goods diameter, shape and sizes the cutter) and superficial layer contact (cutter surface geometry, thermal treatment applied to the material etc.).