METHOD FOR THERMAL FRICTION CUTTING WITH A CIRCULAR SAW OF HEATED ROLLED PIPE WITH A DIAMETER OF 120-200 MM MADE OF LOW-ALLOY STEEL Russian patent published in 2022 - IPC B23D45/00 B23D45/12 

FIELD: thermal friction technology.

SUBSTANCE: invention relates to the technology for thermal friction cutting with a circular saw of a pipe roll heated to a temperature of 1150-1250°C with a diameter of 120-200 mm made of low-alloy steels and can be used, for example, in pipe rolling production. The expected result is achieved in a method for thermal friction cutting with a circular saw of a 120-200 diameter rolled pipe made of low-alloy steel heated to a temperature of 1150-1250°C, including separation of a heated steel pipe with a circular saw for thermal friction cutting made of 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 -20 degrees, the angle between the side surfaces of the tooth equal to 40 degrees, a positive rear angle α, and also, the lateral angle of the bevel of the saw tooth φ. The process of thermal friction cutting of heated low-alloy steel pipe with a diameter of 120 mm is carried out with a circular saw with the sharpening angles of each of its teeth α and φ equal to 8 and 10 degrees, respectively, for large diameters of cut steel pipes from the proposed range, the rear angle, as well as the lateral angle of the bevel of the saw tooth are calculated according to the proposed formulas, while providing a saw feed equal to 7-15 microns/tooth and its feed rate within 0.04-0.08 m/s.

EFFECT: high surface quality of the ends of the workpieces after cutting due to the absence of defects in the form of burrs of unacceptable sizes on them, as well as an increase in the durability of circular saws.

1 cl, 2 dwg