The Extrusion of Metals: Machines and Methods Used in a Little Known Field of Metal Working (Classic Reprint) - Softcover

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Excerpt from The Extrusion of Metals: Machines and Methods Used in a Little Known Field of Metal Working

Although it had been found possible as early as 1850 to extrude such metals as lead and tin and thus form pipes and bars, the extrusion process had not, at that time, been successfully applied to the shaping, by means of extrusion, of such metals as copper, delta-metal, etc. It was when Alexander Dick, the inventor of the delta-metal, made some experiments with this material under high pressure and at high tempera ture, during the latter part of the eighties, that it was first shown that this material could be extruded in a heated state. There were, however, several difi'iculties to overcome. The extrusion process, as is well known, consists of hot plastic metal being pressed through a form or die at high pressure, so that a continuous bar or pipe of the cross-section of the die or form is produced. Lead and tin can be extruded at comparatively low temperatures (250 degrees E), but copper and similar metals re quire temperatures all the way up to 1750 or 1800 degrees F.

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