METHOD FOR THERMAL FRICTION CUTTING OF HEATED PIPE WITH DIAMETER OF 120-200 mm FROM AUSTENITIC CHROMIUM-NICKEL STEEL WITH DISK SAW Russian patent published in 2022 - IPC B23D45/00 B23D45/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to the technology of thermo-friction cutting of pipe with diameter of 120–200 mm from austenitic chromium-nickel steel heated to 1150–1250 °C and can be used, for example, in pipe-rolling production. Method involves separation of a heated steel pipe by a disc saw for thermal friction cutting from low-alloy steel, containing an all-metal body with wedge-shaped cutting teeth located along the contour, each of which contains a front negative angle equal to -35 degrees, angle between tooth side surfaces equal to 70 degrees, positive back angle α, as well as side angle of saw tooth bevel φ. Heat-friction cutting of heated pipe from austenitic chromium-nickel steel with diameter of 120 mm is carried out using a disc saw with sharpening angles of each tooth α and φ equal to 12 and 14 degrees, respectively. For large diameters of cut steel pipes from the proposed range, the rear angle, as well as the side angle of the saw tooth bevel, is calculated by the proposed formulas, wherein saw feed makes 6–12 mcm/tooth and feed rate makes 0.04–0.08 m/s.

EFFECT: providing high quality of surface of ends of workpieces after cutting, as well as increased durability of disc saws.

1 cl, 2 dwg, 1 tbl, 3 ex