METHOD FOR THERMO-FRICTION CUTTING OF HEATED ROLLED PIPE WITH DIAMETER OF 40-120 mm FROM LOW-ALLOY STEEL WITH DISK SAW Russian patent published in 2022 - IPC B23D45/00 

FIELD: metal rolling.

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-alloyed 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-alloy steel rolled stock with diameter of 40–120 mm includes separation of heated steel pipe by disc saw for thermo-friction cutting from low-alloy steel, containing all-metal body with wedge-shaped cutting teeth located along contour, each of which has a front negative angle equal to −35 degrees, an angle between the side surfaces of the tooth equal to 70 degrees, a positive rear angle α, as well as side angle of saw tooth bevel ϕ. Heat-friction cutting of heated rolled pipe from low-alloy steel with diameter of 40 mm is carried out with a disk saw with sharpening angles of each tooth α and ϕ equal to 14 and 16 degrees, accordingly, for large diameters of cut steel pipes from the proposed range, the clearance angle is determined by the formula: α=α₀-k⋅ΔD, and side angle of saw tooth ϕ - by formula: ϕ=ϕ₀-k⋅ΔD, where α₀ = 14 degrees, ϕ₀ = 16 degrees, coefficient k = 0.05 degrees/mm, ΔD is an increase in the diameter of the cut pipe in mm compared to diameter of 40 mm, wherein saw feed makes 8–16 mcm/tooth and feed rate makes 0.06–0.13 m/s.

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

1 cl, 1 tbl, 2 dwg, 3 ex