METHOD FOR THERMO-FRICTION CUTTING OF HEATED ROLLED PIPE WITH DIAMETER OF 120-200 mm FROM LOW-CARBON STEEL WITH DISK SAW Russian patent published in 2022 - IPC B23D45/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to the technology of thermo-friction cutting with a disk saw heated to temperature of 1150–1250 °C from pipe rolling from low-carbon steels and can be used, for example, in pipe rolling production. Method for thermo-friction cutting with a disk saw heated to temperature of 1150–1250 °C from low-carbon steel rolled stock with diameter of 120–200 mm includes separation of heated steel pipe by disc saw for thermo-friction cutting of low-alloy steel, containing all-metal body with wedge-shaped cutting teeth located along contour, each of which contains front negative angle equal to −20°, angle between tooth side surfaces equal to 40°, positive back angle α, as well as side angle of saw tooth bevel ϕ. Heat-friction cutting of heated rolled pipe from low-carbon steel with diameter of 120 mm is carried out using a disk saw with sharpening angles of each tooth α and ϕ equal to 6° and 9°, respectively, for large diameters of cut steel pipes from the proposed range, the back angle is determined by the formula: α = α₀-k₁⋅ΔD, and side angle of saw tooth ϕ - by formula: ϕ = ϕ₀-k₂⋅ΔD, where α₀ = 6°, ϕ₀ = 9°, coefficient k₁ = 0.025°/mm, k₂ = 0.0375°/mm, ΔD is increase in the diameter of the cut pipe in mm compared to diameter of 120 mm, wherein the saw feed is provided equal to 7–13 mcm/tooth and its feed rate is within range of 0.05–0.1 m/s.

EFFECT: improvement of quality of surface of ends of workpieces after cutting and increase in durability of disk saws.

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