Influence of contact interactions of mating surfaces on vibration and noise level of the mechanical press

Abstract

Operations of mechanisms and machines under conditions of dynamic loads, high speeds and vibrations largely depend on the processes occurring in the contact of structural elements within the scope of preliminary displacement before the onset of the sliding friction process. Therefore, the problems of reducing the vibration and noise levels of machines during their operation are directly determined by the contact strength and rigidity of the mating surfaces of the parts. In this work, the authors make an attempt to establish the regularities of the influence of the parameters of mechanical contact on the level of vibration and noise of the KE 2130 press, and ultimately to develop a method for dynamic assessment of joints of the elements. To calculate parameters of the ongoing processes, a dynamic model of elastic mechanical contact under conditions of static friction was used, and all data obtained were experimentally verified. Analysis of the research results made it possible to conclude that the level of vibration and noise during the operation of the press depends on the characteristics of the contacting surfaces of the parts: parameters of the microgeometry of the rough layer, actual contact area, rigidity, physical and mechanical properties of the materials of the contact pair. Based on this, for the given operating conditions of the mechanical press, recommendations were given to reduce the vibration and noise indicators to the permissible limit.