FORM ROLLING METHOD FOR JOINT PORTION OF FLUID SUPPLY PIPE AND FLUID SUPPLY PIPE

摘要

The present invention provides a method, when forming a locking ridge on the outer circumferential surface of a joint section by form rolling, for forming the locking ridge such that a joint section structure, which has excellent ability to prevent pipe separation when the ends of pipes that have the locking ridge are fixed and joined to each other using a housing, is obtained. Using a convex roller positioned inside the pipe to be worked and a circular forming groove positioned on the outside of said pipe, form rolling is performed so that the vertical wall sections of the locking ridge are formed to rise at an angle of 65o to 90o with respect to the outer circumferential surface in the pipe shaft direction and the height from the outer circumferential surface of the locking ridge to the tip of the apex is formed to be at least the sum of the radii of curvature of the surfaces of the working means that contact the pipe.