Study of the Press-Fit Joints Using Multiangle Ultrasonic Sounding

Abstract

A method of quantitative evaluation of the quality of press-fit joints using pulse-echo ultrasonic method is developed. It is shown that the reflection coefficient is the main parameter characterizing the quality of the press-fit joint, i.e., loading capacity determined by the maximum value of torque transmitted by press-fit joint, since it is attributed to normal stresses present at the joint surfaces. The equation based on the measured values of echo-pulse amplitudes in the quill cylinder and assembled joint is derived to calculate the coefficient of ultrasound reflection from the joint interference. Features of the research procedure are specified and described to provide reliable estimation of the quality of press-fitjoints either ofthe selected area of the interference or the averaged around the joint estimation of the joint quality upon multi angle study of the object in different directions and present plane of ultrasonic sounding. An emphasis is made on the possibility and expediency of automation of the multiangle ultrasonic sounding control order to optimize the process of the joint quality assessing.