Impact analysis of temperature, mass, and oscillation amplitude on the assembly of a threaded fastening using ultrasound

A number of works devoted to ultrasonic assembly and disassembly have been analyzed, and their disadvantages have been identified, in particular, lack of attention to the issue of multifactorial nature of the influence on assembly using ultrasound. Based on the analysis of the sources, the factors that can significantly affect the assembly process of threaded fastenings are determined. They are temperature, mass of the assembled fastening, as well as the amplitude of vibrations. The results showed that increasing the mass of the assembled threaded fastening increases the effectiveness of ultrasound application. The results also showed that increasing or decreasing the temperature has virtually no effect on the assembly efficiency, which is confirmed by statistical processing, which shows a small relationship between the response and the factor. At the same time, the use of ultrasound, depending on the temperature, affects the spread of the obtained values within a single point – the values obtained vary in the range of 5 % at average temperatures and in the range of 10% at boundary values. The results of the multifactorial experiment confirmed the nature of the influence of the oscillation amplitude, mass and temperature of the assembled fastening, revealing the importance of the amplitude and mass factors, while the temperature factor can be neglected due to its minor influence. The results of the multifactorial experiment were processed using two different methods, as a result of which similar dependencies were obtained, which, in turn, confirms the high reliability of the obtained results.