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3. Extrusion Extrusion

ME477 Fall 2004 Kwon113. Extrusion A compressive forming process in which the work metal is forced to go through a die opening in a shape of desirable cross-section. Direct vs. Indirect Hot, warm and cold Solid, Hollow and Semi-hallow parts Continuous vs. Discrete Advantage Variety of shapes but a uniform cross-section no waste of material2workbilletExtrusionv, FcontainerDieRamDirect Extrusion (Forward Extrusion )v, FIndirect Extrusion (Backward or Reverse)3 Extrusion Analysis I Reduction ( Extrusion ) ratio Assuming no friction, true strain Pressure required: With friction, where a (~ ) and b ( ) increase with dies angle Indirect Extrusion : Direct Extrusion : Ram Force, F=pAo Power P=FvfoxAAr=xrln= xfrYpln=xxrbaln+= xfYp = +=oxfDLYp2 4 Extrusion Analysis IIIn direct Extrusion , these is additional pressure, Pf,to overcome the friction at the container DirectIndirectRam PressureRam stroke5 Extrusion Dies and Press Shape factorCx=perimeter of the extruded cross-sectionCc=Perimeter of a circle with the same area Formula Impact & H

Extrusion • A compressive forming process in which the work metal is forced to go through a die opening in a shape of desirable cross-section. • Direct vs. Indirect • Hot, warm and cold • Solid, Hollow and Semi-hallow parts • Continuous vs. Discrete • Advantage

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