Drawing of rods, wires and tubes

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Example: Determine the draw stress to produce a 20% reduction in a 10-mm stainless steel wire. The flow stress is given by σσσσ o = 1300εεεε 0.30 (MPa). The die angle is 12o and µ µ µ µ = 0.09. B From Eq.5 From Eq.9 = µ cotα = ( 0. 09) cot 1 1 ε1 = ln = ln = 1− r 1− 0. 2 _ n 0 Kε1 1300( 0. 223) σ = = n + 1 1. 30 σ σ xa xa _ = σ o 6 o 0. 223 . 30 = _ ⎛ + B ⎞ ⎡ ⎛ = σ ⎜ ⎟⎢1 − B ⎜ ⎝ ⎠⎢ D ⎣ ⎝ 0. 8571 = 637MPa Suranaree University of Technology Tapany Udomphol Jan-Mar 2007 D D 2 Ab 1. 0 ln ( 1+ B) = 637ln 2 A 0. 8 a b a = 10mm = D b ( 1 ( 1. 8571) − r) = 2B 1 Da ⎞ ⎛ 1. 8571⎞ 8571 b ⎟ ⎠ ⎤ ⎥ = 637⎜ ⎟ ⎥ ⎝ 0. 8571 ⎦ ⎠ 10( 0. 8) = 527MPa = 8mm 2× 0. [ 1− 0. 8 ] = 438MPa ~ 20% difference
If the wire is moving through the die at 3 m.s -1 , determine the power required to produce the deformation. Drawing force Power Power Pd = σ xa Aa = dis tan ce force × time π 2 = 438× ( 8) = 22. 02kN 4 Power = 22 . 02× 3 = 66. 06kW Suranaree University of Technology Tapany Udomphol Jan-Mar 2007
Page 1 and 2: Drawing of rods, wires and tubes Su
Page 3 and 4: Introduction : wire drawing www.e6.
Page 5 and 6: Introduction • Drawing operations
Page 7 and 8: Rod drawing • Rods which can not
Page 9 and 10: Example of wiredrawing dies A drawi
Page 11 and 12: http://www.scob.de Drawing die mate
Page 13 and 14: coil Wire drawing process die Top v
Page 15 and 16: Stepped-cone multiple-pass wiredraw
Page 17 and 18: Defects in rod and wiredrawing Defe
Page 19 and 20: dx/cos αααα p cosαααα dx Co
Page 21 and 22: Since the yield condition for plane
Page 23: In the absence of friction, B = 0 a
Page 27 and 28: Stress Procedure for determining re
Page 29 and 30: U The effect of die angle on the to
Page 31 and 32: stress σσσσ εεεε σσσσ x
Page 33 and 34: σ or Example: From previous exampl
Page 35 and 36: Classification of tube drawing proc
Page 37 and 38: Fixed plug drawing www.scielo.br
Page 39 and 40: Moving mandrel drawing • Draw for
Page 41 and 42: σ B Analysis of tube-drawing tube
Page 43 and 44: The stresses in tube sinking have b
Page 45 and 46: Effects of semi die angle and reduc
Page 47: References • Dieter, G.E., Mechan

Drawing of rods, wires and tubes

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