METHOD FOR CUTTING HEATED WORKPIECES WITH A DIAMETER OF 200-400 MM FROM LOW-CARBON STEEL WITH A CIRCULAR SAW Russian patent published in 2021 - IPC B23D45/00 

FIELD: pipe rolling.

SUBSTANCE: invention relates to the technology of cutting heated round blanks from low-carbon steels with a circular saw and can be used, for example, in pipe rolling production when cutting both cast and hot-rolled round blanks. The method involves the separation of a steel billet with a circular saw made of low-alloy steel, containing an all-metal body with wedge-shaped cutting teeth located along the contour, each of which has a front angle of the cutting edge equal to (-5°)-(-7°), the back angle, equal to 15°, the side angle of the bevel of the saw teeth, determined by the dependence where ϕ is the side angle of the bevel of the saw teeth in degrees, ΔD is the increase in the diameter D of the cut workpiece compared to the diameter Do=200 mm. At the same time, feeding of the saw is provided, equal to 2.8-3.0 mm/tooth, and the cutting speed is within 70-105 m/s.

EFFECT: high quality of the surface of the ends of workpieces after cutting is achieved and the durability of the circular saws is increased when moving from one diameter of the cut work piece to another.

2 cl, 2 dwg, 1 tbl, 3 ex