Powder molybdenum alloy workpieces contact interactions under abrasive flow machining by high viscosity media

The purpose of the article is to analyze contact interactions under abrasive flow machining by a high viscosity medium, to reveal a number of common phenomena characteristic of other processing methods of molybdenum powder alloy workpieces, to describe some features of the process. One of the problems of modern production is mechanical processing of parts made of hard-to-work materials, e.g. molybdenum alloys. The abrasive flow machining by a high viscosity medium is proposed for finish processing of workpieces made of molybdenum powder alloys. For this purpose the model of material removal by a single abrasive grain is refined. This model presents an abrasive grain as a multi-blade tool that impacts the treated surface both on the actual contact area and contour. It is proved that the origination of the components of the cutting force that impacts a single abrasive grain is due to tangential and normal stresses of the working medium flow. Analysis is given to the features of contact interactions taking place under abrasive flow processing of molybdenum powder alloy workpieces. To assess the initial state of the surface before finishing the surface layer of molybdenum powder workpieces is described after turning and EDM wire cutting in terms of the initial state. Justification is given to abrasive flow treatment in two stages with varying the type of abrasive and its grain size. Experiments proved the possibility of using an abrasive flow of high viscosity medium for finishing treatment of molybdenum powder workpieces. The features of the abrasive flow processing using a high viscosity working medium are revealed. The recommendations are given on the use of abrasive flow treatment modes for specific sizes of holes in molybdenum powder workpieces.

abrasive flow machining, high viscosity medium, molybdenum powder alloy, contact interaction, roughness, abrasive grain