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ME364 MET KS Ch15 - Chapter 15 Extrusion and Drawing of...

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1 Chapter 15 Extrusion and Drawing of Metals
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2 Direct-Extrusion A cylindirical billet is forced through a die. Figure 15.1 Schematic illustration of the direct-extrusion process.
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3 Extrusions and Products Made from Extrusions Figure 15.2 Extrusions and examples of products made by sectioning off extrusions. Source: Courtesy of Kaiser Aluminum.
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4 Types of Extrusion Figure 15.3 Types of extrusion: (a) indirect : die moves toward the unextruded billet, (b) hydrostatic : pressure moves billet, no friction with container, (c) lateral: much less common.
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5 Process Variables in Direct Extrusion Figure 15.4 Process variables in direct extrusion. The die angle, reduction in cross-section, extrusion speed, billet temperature, and lubrication all affect the extrusion pressure.
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6 Extrusion Force Figure 15.5 Extrusion constant k for various metals at different temperatures. = f o o A A k A F ln force, Extrusion A o /A f : extrusion ratio, k : extrusion constant, Extrusion force depends: a.) strength of billet, b.) extrusion ratio, c.) friction between billet, chamber and die surfaces, d.) process variables such as temperature of billet, speed of extrusion
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7 Types of Metal Flow in Extrusion with Square Dies Figure 15.6 Types of metal flow in extruding with square dies. (a) Flow pattern obtained at low friction or in indirect extrusion. (b) Pattern obtained with high friction at the billet-chamber interfaces. (c) Pattern obtained at high friction or with coiling of the outer regions of the billet in the chamber. This type of pattern, observed in metals whose strength increases rapidly with decreasing temperature, leads to a defect known as pipe (or extrusion) defect.
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8 Extrusion Temperature Ranges
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9 Iron-iron Carbide Phase Diagram
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10 Extrusion-Die Configurations Figure 15.7 Typical extrusion-die configurations:
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