RESEARCH ON DURABILITY OF A THREADED PAIR WITH A ROLLING SCREW-THREAD

Abstract

A comparative study of durability of two groups of threaded pairs of М8 and М12 is undertaken. Every group consists of a nut welded on to a plate, and a screw-bolt with a steel grade 88, that constitute a check pair and a plate with a rolling screw-thread produced by means of thermal knurling according to flowdrill and flowtap technologies and a screw-bolt with a steel grade 88, that constitute a pair under study. A screw-bolt was tightened till yielding of material in a joint. Thereby a peak torque was fixed with a torque indicating wrench. A comparison of torques of a check pair and a pair under study with each other and with performance standards was made. Recommendations are given on the use of a new technology in engineering.