Dick extrusion method

This press was of the horizontal four-column type, fitted with a container out of which a cylindrical billet was forced through a die being locked in the counterplaten, by a ram being attached to the plunger. This extrusion method has been maintained in principle up to the present time and is generally known under the name of its inventor as Dick Extrusion Method. 

Combined tube and rod extrusion presses are sometimes designed so as to be suitable both for direct and inverted extrusion. In the direct or Dick extrusion method, as illustrated in Fig. 56 a, the billet lies between extrusion ram and die. Consequently, frictional resistance has to be overcome on the wall of the container which has its highest value at the beginning of the extrusion cycle and decreases in accordance with the reduction in length of the billet. When extruding by the inverted method. 

Fig. 56a and b, a) Direct extrusion (Dick s method), b) inverted Extrusion... 

In 1797, Joseph Barmah patented the first extrusion process for making lead pipes. The metal used to be preheated and ram was hand-driven. In 1820, Thomas Burr built the first hydraulic power press that was to extrude lead pipes (Sheppard 2013). The process was called squirting. By the end of nineteenth century, the extmsion methods were also in use for copper and brass alloys. Alexander Dick invented a hot extrusion process for nonferrous metals in 1894. North America has its first aluminum extrusion process in 1904. In 1950s, Sejounet introduced molten glass as lubricant in extmsion process. 

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See also in sourсe #XX -- [ ]

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