СHIP FORMATION AND TOOL WEAR BEHAVIOR UNDER STRUCTURAL STEEL TURNING
PURPOSE. This article studies the wear kinetics of tool cutting edges and compares the obtained results with the nature of changing deformation characteristics of chip formation. The purpose of the article is to identify and estimate the deformation parameters of chip formation with the characteristics of cutting edge wear. METHODS. Experimental and computational methods are used to study chip formation and tool edge wear characteristics. The process of chip formation is studied on the basis of the chip photographs produced by means of an electron microscope. Microslices, chip roots, and shaving surfaces opposite to the cutter side are considered. V.S. Kushner’s method is used to determined specific shear stresses and shear stresses on the front surface of the cutting edge, as well as the cutting temperature. Wear characteristics are studied based on building kinetic curves of wear and their subsequent processing. CONCLUSIONS. The intensity of cutting edge wear depends on the nature and size of the texture of chips being formed. The latter are determined by the cutting speed and the thickness of the cut layer. Maximum cutting path (minimum relative wear) corresponds to the cutting mode at which the macroelements of the chip texture ( Δх ) being formed are close in size to the thickness of the cut layer a.