Ch15 Metal Extrusion And Drawing Processes

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Drawing g Practice continued Pointing Pointing – A ‘push’ operation to create a feathered tip tip at start to be threaded through dies Drawing speeds: Depend Depend on material material & & % % reduction reduction High speeds may raise temperatures, affecting properties Temper Temper: Temper Temper: A designation for hardness (1/4 hard, ½ hard) due to work hardening May need to anneal (soften) metal between passes to maintain ductility
Drawing g Practice continued Bundle Bundle Drawing Drawing Draw Draw many (100s) (100s) wires wires together To increase productivity, esp. fine wires Keep wires separated by suitable metallic metallic material, lower chemical resistance; later leached Produces polygonal x-section x section C Can alternatively lt ti l produce d fine fi wires i of f different diff t size & shape
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: Drawing g Practice Usually, the sm
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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