Tension joints assembled by axial method and experimental determination of their tightness according to the proposed technical solution

Background. Among all fixed connections in mechanical engineering, tension connections are distinguished by a wide variety and make up about 20% of all connections. The article analyzes existing methods for assembling tension connections and indicates solutions for ensuring their tightness. The purpose of the work is to ensure the tightness of tension connections with a longitudinal assembly method. Materials and methods. The program of experimental studies is given. It is shown that control of shaping of the surface layer of mating parts in the longitudinal assembly method solves the problem of ensuring the tightness of joints. A technical solution is proposed. Results. The graphs of the dependence of pressing forces along the length of the joint on the value of the tension and the presence of sealant are presented. The graphs of the degree of tightness of pressed parts assembled from different materials are shown. Conclusions. Tension joints assembled using existing technology without sealant do not provide tightness of the joint, while the use of sealant increases the pressing force. Controlling the formation of the surface layer of the covered part is possible without complicating the design and manufacturing technology, which allows for ensuring the strength characteristics and the required tightness of the joints.