Ch15 Metal Extrusion And Drawing Processes

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Wet drawing Methods of of L Lubrication b ication Dies & rod are immersed in lubricant Dry drawing S Surface f of f rod d i is coated t d with ith l lubricant b i t in i a stuffing t ffi box b prior to drawing through die <strong>Metal</strong> eta coat coating g Coat rod/wire with soft metal (Cu, Sn) that acts as solid lubricant Ult Ultrasonic i Vibration Vib ti Vibrate dies & mandrels; Vibrations reduce forces, improve p surface finish & die life; ; allow greater g reductions
Seams <strong>Drawing</strong> g Defects Longitudinal scratches or folds May open up in later forming operations Cause Cause serious quality quality-control quality control control problems Surface defects (scratches, die marks) Improper selection of process parameters Poor lubrication Poor die condition (e.g. scratches) Surface defects (scratches, die marks) Centre cracking
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: To improve die life Lubrication To
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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