Ch15 Metal Extrusion And Drawing Processes

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FIGURE 15.16 (a) Impact extrusion of a collapsible tube by the Hooker process. (b) and d (c) ( ) Two T examples l of f products d t made d by b impact i t extrusion. t i These parts also may be made by casting, forging, or machining. The choice of process depends on the materials involved, part dimensions and wall thickness, thickness and the properties desired desired. Economic considerations also are important in final process selection.
Hydrostatic <strong>Extrusion</strong> The pressure required in the chamber is supplied via a piston through an an incompressible incompressible fluid fluid medium surrounding the billet The fluid in contact with die surfaces reduces friction A cold process Th The viscosity i it of f th the fl fluids id used d (vegetable ( t bl oils il such h as castor oil) does not change with heat Can Can use use to to extrude extrude brittle brittle materials Ductility is increased Limited applications Complex tooling; specialized equipment; uneconomic
Page 1 and 2: Metal Extrusion and Drawing Process
Page 3 and 4: FIGURE 15.1 Schematic illustration
Page 5 and 6: Extruded Products Railings for sli
Page 7 and 8: Extrusion Process Direct (or Forwa
Page 9 and 10: FIGURE 15.4 Process variables in di
Page 11 and 12: FIGURE 15.5 Extrusion constant kk f
Page 13 and 14: FIGURE 15.6 Types of metal flow in
Page 15 and 16: Figure 15.1
Page 17 and 18: FIGURE 15.7 Typical extrusion extru
Page 19 and 20: FIGURE 15.8 Extrusion of a seamless
Page 21 and 22: FIGURE 15.10 Poor and good good exa
Page 23 and 24: Useful in hot extrusion: Lubricatio
Page 25 and 26: Cold Extrusion Extrusion Uses s sl
Page 27 and 28: Cold Extrusion E t sion Force = F
Page 29 and 30: FIGURE 15.13 Production steps for a
Page 31: FIGURE 15.15 Schematic illustration
Page 35 and 36: Extrusion Defects continued Pipe (a
Page 37 and 38: FIGURE 15.17 (a) Chevron cracking (
Page 39 and 40: FIGURE 15.18 General view of a 99-M
Page 41 and 42: FIGURE 15.19 Process variables in w
Page 43 and 44: Drawing Force Force Drawing force
Page 45 and 46: Drawing g Practice Usually, the sm
Page 47 and 48: Drawing g Practice continued Bundle
Page 49 and 50: Die Design g Die angles usually 6
Page 51 and 52: To improve die life Lubrication To
Page 53 and 54: Seams Drawing g Defects Longitudin
Page 55 and 56: FIGURE 15.23 Cold drawing drawing o
Page 57: Summary Extrusion: Push billet thr

Ch15 Metal Extrusion And Drawing Processes

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