Backward extrusion method and product
AssigneeLuxfer Group Limited
InventorsNigel John Henry Holroyd, John Terence Evans, Robert Arthur Cudney
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Abstract
A method of forming a closed-end vessel by backward extrusion comprises providing an extrusion billet having a front surface with an axial recess and a body of an extrudable material positioned in the recess. Backward extrusion results in the formation of a closed-ended vessel, for example a pressurized gas cylinder, composed of the material of the extrusion billet with a weld bonded inner surface lining of the extrudable material.
Claims10
A backward extrusion method for forming a closed-ended vessel for use as a high pressure gas container which comprises providing, in a container for backward extrusion, a billet of a first extrudable metal, said billet having an axis and a forward face, lubricating the billet, and driving a ram along the axis into the forward face of the billet,
- wherein the forward face of the billet is made with an axial recess and a body of a second extrudable metal is provided in the recess so as to exclude lubricant from the interface between said first extrudable metal and said second extrudable metal,
- whereby there is formed a closed-ended vessel composed of the first extrudable metal with an adherent inner surface lining of the second extrudable metal.
A backward extrusion method for forming a closed-ended vessel, said method comprising the steps of:
- providing a billet of a first extrudable metal in a container for backward extrusion, said billet having an axis and a forward face, said billet having an axial recess in said forward face;
- locating a body of a second extrudable metal in said recess so as to seal any space between said first and second extrudable metals from any subsequently applied extrusion lubricant;
- lubricating said billet with an extrusion lubricant;
- and
- backward extruding said billet and said second extrudable metal so as to provide said closed end vessel.
Dependencies are inferred from the claim text.