FIELD: tube rolling; applicable in tube cold rolling on roller mills. SUBSTANCE: sizing of tool for tube cold rolling is characterized by the fact curves of development profile of external tool and profile of internal tool are geometric place of nodal points of different spline functions. Cogging- down and sizing sections of each separately taken external or internal tool are made in form of unified curve. In calculations of sizing, coefficients governing mechanical and physical properties of rolled material and conditions of rolling are used along with geometric parameters of spline functions of calculation curves. EFFECT: provided high accuracy of manufactured tubes with quality surface and stable mechanical properties. 3 cl, 1 dwg, 3 ex
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