MÉTODO DE USINAGEM DE UMA PORÇÃO TERMINAL DE UMA MEMBRO TUBULAR LONGO

摘要

Thread cutting of the end portion of a long tubular member (1) held by a chuck system (3) is carried out with high accuracy without leaving mill scale on the complete thread portion of the resulting threads. The protruding length L of the long tubular member from the chuck system (3) to the end face of the tubular member is controlled so that the ratio L/D of the protruding length L to the outer diameter D of the long tubular member (1) is in a range predetermined depending on the outer diameter D and the ratio t/D of the wall thickness t to the outer diameter D of the tubular member (1). When the chuck system is a floating chuck system having a floating chuck and a positioning chuck, the protruding length L of the tubular member from the floating chuck and the protruding length L'thereof from the positioning chuck are controlled.