Device for producing oil supply pipe and method for producing oil supply pipe

A method for producing an oil supply pipe which is a method for forming a threaded portion in a metal pipe by disposing a first forming roller on an outer circumferential surface side of the metal pipe, disposing a second forming roller on an inner circumferential surface side of the metal pipe, and subjecting the metal pipe to roll forming using the first forming roller and the second forming roller, the method comprising:

• using, as the first forming roller, the first forming roller having a first rotating shaft, a first circumferential surface, and one first ridge portion spirally provided in a circumferential direction on the first circumferential surface to have a length of less than one turn, and
• as the second forming roller, the second forming roller having a second rotating shaft, a second circumferential surface, and a second ridge portion spirally provided in the circumferential direction on the second circumferential surface,
• a preparation step of inserting the metal pipe into the second forming roller and disposing the first rotating shaft and the second rotating shaft so that they are parallel to each other;
• and
• a formation step of forming the threaded portion formed of a spiral protrusion in an inner circumferential surface of the metal pipe by pressing a material forming the metal pipe between the second ridge portions using the first ridge portion while rotating the first forming roller and the second forming roller.