Abstract
The assembly process of flareless pipe joints is very important for the
sealing performance of hydraulic pipeline system. Based on the theory of
contact mechanics, a theoretical model of the assembly process of pipe
joints is established to simulate the extrusion molding process of
flareless pipe joints. It is found that tightening torque is an
important factor affecting the sealing performance of pipe joints. By
comparing the changes of the contact stress between the sleeve and the
pipe joint under different tightening tortures, combined with the
mechanical transfer and deformation results of the contact surface, the
results show that the fitting situation of the sleeve and the pipe is
good when the expansion pressure is 180Mpa, and the sealing performance
of the pipe joint is good when the tightening tortures are between 15N·m
and 18N·m.