This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The tapered screw joints are widely used in the formation of the drill string. They consist of two parts - a box and a pin. during the process of screwing box and a pin the contact pressure between thread surfaces arises, the magnitude of which affects the intensity of wear on these surfaces. For the first time, the authors offer in this work to change the contact area of the thread face by the change in the shape of the cutting edge of the threading turning tool. Previously, in the works of these authors themselves, it was offered to change the shape of the cutting edge exclusively to increase the tightness of the joint. In other works, the justification for changing the geometric parameters of such cutters was offered in order to obtain the possibility of the thread manufacturing from materials with a strength limit of more than 1300 MPa. In this paper an analysis of the influence of the geometric parameters size of the cutter on the value of the contact pressure between the thread surfaces of the box and the pin is carried out. Among the above geometric parameters, the back rake angle is the most important. As a result of theoretical studies, a certain functional dependence of the contact pressure in the tapered thread joint from the shape of the cutter edge and the magnitude of its back rake angle is obtained.
The statements, opinions and data contained in the journal are solely those of the individual authors and contributors and not of the publisher and the editor(s). We stay neutral with regard to jurisdictional claims in published maps and institutional affiliations.
