Press-fit joints study by multiangle ultrasonic sounding method

Abstract

In the article the authors consider the problem and the way of press-fit joints quality quantitative estimation with an ultrasonic echo-impulse method. It is shown that the reflection coefficient is the general characteristics of press-fit joint quality rather its load carrying capacity defined by the maximum rotation moment transmitted by the press-fit joint, because it is bound with the normal stresses appearing on the joint surfaces. The equation for calculation of the coefficient of ultrasound reflection from the interference area of a joint by echo-impulse amplitudes measured from the quill cylinder and from a joint is received. Peculiarities of the research procedure are accentuated and described. The peculiarities allow receiving exact estimation of press-fit joints quality by a non-destructive method either on the localized areas of the interference or the estimation of an averaged value around the joint during multiangle study of the object on different directions in the definite ultrasonic sounding plane. Special attention is paid by the authors to the possibility and practicability of automation of the process of control on the basis of the multiangle ultrasonic sounding method in order to improve the joint quality studying process.