METHOD OF CUTTING OF EXTERNAL DAMP-PROOFING COATING OF PIPELINES Russian patent published in 1997 - IPC

FIELD: cleaning of main pipelines. SUBSTANCE: cutting tool is pressed to the pipe and rotated in a helix. The plane passing through the edge of the tool cutting blade is set at an alpha angle within 15 to 20 deg. to the line passing through the point of tool contact with the pipe in the direction of the pipe cylinder element. In addition to orbital and transportation motions, the cutting tool, be means of a drive, is imparted a rotary circular motion at angular velocity W, kinematically connected with angular velocity ω of orbital motion at ratio of blade edge tangential velocity v to orbital motion velocity =1.2-1.3 in the direction of rotation at angle w, at which the acute angle between vectors of velocities Vt and Vx is realized. EFFECT: facilitated procedure. 1 dwg