Дослідження впливу викінчувальних операцій на формування параметрів якості поверхні втулок бурових помп

Abstract

The optimal technological process planning of responsible machine parts manufacturing, in particular cylinder bushings of drilling pumps for gas and oil production equipment, is most effective using a system approach for the investigation of relationships with the technological environment: machine-fixture-tool-blank. A rational choice of finishing, finishing and strengthening operations of technological processes for the manufacturing of machine parts provides the formation of the necessary parameters of accuracy, quality of the surface layer and operational characteristics. Traditional technological methods for finishing treatment of machine parts and methods of chemical-thermal treatment and coating enough are not effective to provide the operational characteristics of the cylinder bushings of drilling pumps. Vibration technologies as a group of the surface plastic deformation methods are used for finishing and strengthening operations of technological processes of parts manufacturing in different industries. The purpose of the investigations of this paper is to analyze the influence of technological parameters of vibration processing methods, in particular vibration-centrifugal strengthening, on the formation of surface quality parameters of cylinder bushings of NB32 drilling pumps. Materials for researches are selected. Drawings of the exploratory prototype are shown. A schematic diagram of a volumetric vibrating machine and technological equipment for the implementation of vibration technology is given. Their structure and operating principle are described. The methodology for the implementation of experimental researches is given. The methodology for determining the geometric parameters of the surface layer quality of the part material is described. A complex for measuring the geometric parameters of the part surface quality is given. The results of change the surface topography of the parts after vibration-centrifugal treatment are presented and analyzed. It has been established that vibration-centrifugal strengthening of the inner surfaces of the bushings with balls of  10 and  12 mm improves the parameters of the microrelief of their profiles by reducing the height parameters of the surface microprofile by 9.49-36.9 times and increasing the step parameters by 288.79-399, 49 times compared to the surface after lathe machining. Further researches in this field will concern the optimization of processing regimes and the development of practical recommendations for using vibration-centrifugal strengtheners with unbalance drive for improving the operational characteristics of bushings.