An extrusion press forces a billet of metal through a shaped die opening under very high pressure, usually applied by a hydraulic ram, so that the metal emerges as a continuous length with the die's cross-sectional profile, a method used to produce long, uniform shapes such as rods, tubes and structural sections. The English inventor Joseph Bramah patented the first extrusion process in 1797, building a hand-operated hydraulic press to force soft lead through a die to manufacture seamless lead pipe. Extrusion was later extended to harder metals such as copper, brass, and eventually aluminum and steel, as press capacities and die materials improved through the nineteenth and twentieth centuries, and the direct hydraulic extrusion press remains the standard machine for producing aluminum structural and architectural profiles.
Facts
SignificanceCan produce very complex cross-sections and work brittle materials because the material sees only compressive and shear stresses. 1 FAQs
Why can extrusion make complex shapes and work brittle materials?
The material is only compressed and sheared as it passes through the die.
Extrusion can create very complex cross-sections and can work materials that are brittle because the material encounters only compressive and shear stresses as it is pushed through the die.
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Source Wikipedia: Extrusion
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1. Wikipedia: Extrusion
History
In 1797, Joseph Bramah patented the first extrusion process for making pipe out of soft metals.
Lead section, sentence 2
its ability to create very complex cross-sections
In Group: Metal Casting and Forming Processes, Lead paragraph
is a process used to create objects of a fixed cross-sectional profile by pushing material through a die
Invented By: Joseph Bramah, History section
In 1797, Joseph Bramah patented the first extrusion process for making pipe out of soft metals.
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