Hose fitting
A machine, tooling and method for cold forming complex metal parts such as a banjo style hose fitting starting with a near net shape volume of wire and continuing with multiple forging blows and an intermediate rotation of the blank to produce a hose coupling shell end, a transition neck, a large counterbored annular coupling body and a perpendicular alignment tang.
1. A method of forming a product having a general shape of a banjo style hose fitting comprising the steps of cutting a piece of round metal wire, with a central axis, to a length corresponding to a volume near net shape of the finished part, coning one end of the initial part to increase its diameter, upsetting a portion of the part spaced from the coned end into a ball-like formation, back extruding the coned end to form a hollow open end shell concentric with the axis for receiving a cylindrical part, flattening the ball-like formation to form opposed faces and piercing a hole through the flattened formation from one of its faces.
2. A method as set forth in claim 1 , wherein the part is open extruded on an end opposite said coned end to form an alignment tang.
3. A method as set forth in claim 2 , wherein said alignment tang is bent at a right angle to its original axis of extrusion.
4. A method as set forth in claim 1 , wherein said flattened formation is formed with a counterbore produced by piercing said formation twice, the first piercing step producing a temporary bore, the temporary bore being sheared into a larger bore to gather material adjacent the other of said faces and the second piercing step forming the minor bore of said counterbore.