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, comprising an all-metal housing with wedge-shaped cutting teeth arranged along the contour, each of which has a front negative angle equal to −35°, angle between tooth side surfaces equal to 70°, 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 10° and 12° respectively, for large diameters of cut steel pipes from the proposed range, the clearance angle is determined by the formula: α = α_o-k⋅ΔD, and side angle of saw tooth ϕ - by formula: ϕ = ϕ_o-k⋅ΔD, where α_o = 10°, ϕ_o = 12°, coefficient k = 0.075°/mm, ΔD is an increase in the diameter of the cut pipe in mm compared to diameter of 120 mm, wherein saw feed makes 6–14 mcm/tooth and feed rate makes 0.06–0.12 m/s.

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

1 cl, 2 dwg