FIELD: metallurgy.
SUBSTANCE: invention relates to machining of materials and can be used for machining of inner surfaces with different geometrical parameters. Proposed tool comprises steps arranged along lengthwise axis in the form of various blade tools forming cutting part with cutting edges. Cutting part is made from hard alloy with change of its chemical composition from periphery of tool to centre, providing equality of resistance of peripheral sections of cutting edges on all steps of tool in axial direction and equality of resistance of all sections of each cutting edge at each step of cutting part along its length from periphery to tool centre in radial direction.
EFFECT: increased accuracy of machining and resistance of all stages of tool.
1 cl, 2 ex, 8 dwg
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