Study of the process of the deformation of material of piston functions at their restraints

Abstract

The methods, which provide increase of durability of engines of agricultural technics due to use of effective technologies at manufacturing and restoration of piston fingers, are considered. The method of restoration of piston fingers of automotive motor engines with the use of mechanical vibration oscillations of the working tool is proposed. The researches on the choice of the basic parameters of the processing tool - the punch, which contribute to the improvement of the quality of the restoration of the piston fingers of the engines, provides their increased wear resistance and, consequently, the reliability of the engine. The types of main deformations in the processing of material of fingers on their length, external and internal diameters with indication of their features are established. The changes in the sizes of the processed samples by their length under conditions of normal and vibration load are researched. The values of the degree of strengthening of material of piston fingers and bronze bushings are found. Microstructural studies have been conducted to determine the effect of the deformation method on the properties of the piston fingers metal. The influence of the method of processing the piston fing ers on the process of transfer (sticking) of their material to the working surface of the working tool - punch is investigated. Studies of wear resistance of samples, cut from piston fingers and bronze bushings of engines on a friction machine according to the scheme "roles - a shoe". The intensity of wear of the specified friction pair is determined by the average value of the weight loss of the roller and the shaft. The graphic dependences of the results of the wear and tear of the roller and the block in normal and vibration deformation, depending on the time of the tests, are given. The results of bench tests allow to develop and introduce into production the technological process of restoration of piston fingers and bronze bushings by the method of vibration deformation.