Increase of Wear Resistance of the Drill Pipe Thread Connection by Electromechanical Surface Hardening

摘要

The application of the electromechanical surface hardening (ESH) of a bx and external tool-joint thread Z-117 of drill pipes is substantiated. The results of the experimental researches of comparative wear resistance of the threaded connections of nipple and coupling, made of 1040 (40X) steel with threads only after improvement and improvement and ESH has been given. The most typical defects of nipple and coupling drilling pipes is the threads wear, a coupling end wear, the nipple thrust collar wear and the wear of the outer diameter of the locks. Products withstood set 500 cycles of screwing - unscrewing, without disturbing the geometry of the threads and the setting of the threaded joint, the make-up torque is 17-18 kN m. The effectiveness of hardening thread by the electromechanical surface hardened has been proved. The purpose of the test: to determine the wear resistance of the threaded joint pin and a box of drill pipe with tool-joint thread Z-117, reinforced by various technologies.