Method of cold forming tubes with interior thicker wall sections

Details Method of cold forming tubes with interior thicker wall sections Method of cold forming tubes with interior thicker wall sections

1979-10-24

1981-07-14

Parker, Roscoe V.

Metal deforming

By extruding through orifice

Utilizing internal forming means

B21C 2506

Patent

active

042779693

ABSTRACT:
A method for cold forming metal tubes with inwardly thickened wall sections including positioning a short, tubular blank in a die having an extrusion die throat, and pushing the blank through the die throat with a punch. The punch is formed with a co-axial mandrel-like extension which fits within the blank and die throat. The extension is formed of co-axial sections of successively smaller diameter. Thus, as the punch pushes the end of the blank to move the blank through the die throat, a narrower diameter extension section fits within the die throat to extrude a thickened end portion. Thereafter, continued punch movement positions a wider mandrel forming extension section within the die throat to extrude a thin wall tube section. At a point where a wall thickened section is to be formed interiorly of the tube, the punch is removed and replaced by a different punch having a mandrel forming extension of different diameter than that mentioned above, wherein movement of the second punch results in the extrusion of a thickened tube section in the annular space between the extension section and the die throat, with continued punch movement thereafter positioning a further punch extension within the die throat for forming additional thin wall sections on the tube. The trailing end of the blank may then be provided with a thickened end section similar to the leading end of the blank by utilizing the initial punch in place of the second punch.

REFERENCES:
patent: 3837205 (1974-09-01), Simon
patent: 3886649 (1975-06-01), Simon
patent: 3948073 (1976-04-01), Lovell
patent: 4166373 (1979-09-01), Braun

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