VORRICHTUNG ZUM KALTSCHMIEDEN VON ROHRFORMTEILEN.

摘要

An improved cold forging tool to exert radial forces outwardly to form a tubular member outwardly into an annular member which includes a central body (12) having external recesses (22, 24) and external shoulders (32) at each end, a resilient sleeve (26) surrounding the central body and having its ends positioned within the external recesses, a passage (28) through the central body to communicate between a pressure supply means connected to the end of the body and the interior of the resilient sleeve, and first and second dual segmented, expandable anti-extrusion rings (38, 48) positioned between the central expansion portion of the resilient sleeve (26) and each of the shoulders, resilient means (44, 54) retaining the segmented rings in surrounding relationship to the ends of the resilient sleeve to prevent extrusion of the resilient sleeve during the forming of the tubular member and means limiting the radial outward movement of the outer of the segmented rings.