Ch15 Metal Extrusion And Drawing Processes

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Residual Stress Caused by non-uniform non uniform deformation during cold drawing Light reductions Longitudinal Longitudinal-surface surface residual stresses are compressive; bulk bulk is is in in tension tension Improve fatigue life Heavier Heavier reductions Surface stresses in tension; bulk in compression Can be significant cause of stress stress-corrosion corrosion cracking over time May cause part to warp warp if a layer is removed (as part of of a forming forming operation such as as slitting, slitting machining, grinding)
FIGURE 15.23 Cold drawing drawing of of an an extruded extruded channel channel on on a a draw draw bench bench to to reduce its cross section. Individual lengths of straight rods or of cross sections are drawn by this method.
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 and 32: FIGURE 15.15 Schematic illustration
Page 33 and 34: Hydrostatic Extrusion The pressure
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: Seams Drawing g Defects Longitudin
Page 57: Summary Extrusion: Push billet thr
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Ch15 Metal Extrusion And Drawing Processes

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