Methods for Manufacture of Pipe Element Having Shoulder, Groove and Bead

摘要

In a method for forming a pipe element, a spin forming tool is revolved in an orbit of increasing diameter within the pipe element. The pipe element is captured within a die. The method forms a circumferential shoulder at one end. The shoulder has an outer diameter greater than the outer diameter of the pipe element. A groove is formed adjacent to the shoulder. The groove has a floor surface with an outer diameter less than the outer diameter of the pipe element. A bead is formed contiguous with the groove. The bead has an apex with an outer diameter greater than the outer diameter of the pipe element.

主权项

1. A method of forming a circumferential shoulder and groove in a pipe element, said method comprising:
capturing an end of said pipe element in a die; inserting a tool within said pipe element; revolving said tool in an orbit about a longitudinal axis of said pipe element; increasing the diameter of said orbit while revolving said tool so as to force said tool against an inner surface of said pipe element; conforming said pipe element to said die so as to form said circumferential shoulder therein, said shoulder having a larger outer diameter than the outer diameter of the remainder of said pipe element; forcing said tool against said inner surface of said pipe element while revolving said tool in said orbit of increasing diameter causing a portion of said tube adjacent to said shoulder to move radially inwardly away from said die thereby forming said circumferential groove, said groove having a smaller outer diameter than the outer diameter of the remainder of said pipe element.