DEFORMATION AND THERMAL PHENOMENA IN THE CUTTING METAL THERMOFRICTIONAL ZONE
The peculiarities of the deformation and thermal phenomena are considered in the cutting metal thermofrictional zone. The research results of contact interaction between tool and workpiece are cited. Due to dry, boundary and complete lubrication friction processes alternation, the liquid metal phase stable layer has been proposed to create in the contact zone, which allow execute machining at a tool surface operating temperature without heating of the work material deep layers. As a result of the replacement of sliding friction by direct contact of bodies separating the internal friction of the fluid layer decreases the frictional resistance and wear rate of the cutting disk. The study of the contact interaction of tool and workpiece has been manifested the need for analysis of the heat-evolution processes, the heat distribution in the contact zone, contact temperatures and temperature fields, mechanical and adhesive properties of the heated surface layers, as well the processes associated with the friction surfaces melting. This boundary layer will stabilize and minimize tool wear. The theoretical working processes analysis results of thermofrictional disk tool workpiece machining are given. The physical process model which takes into account the regularity of the molten metal flow are constructed. It has been established that when inserting the disc tool into the workpiece the layer thickness of the molten metal increases as a function of time and reaches a maximum, which is approximately equal to the thickness of the cutting layer. With the layer of molten metal is divided into three parts: the first one generates the machining workpiece surface, the second one forms the inner chip surface, and the third one is distributed over the surface of the tool and it is removed from the cutting zone