Computer Simulation And Experimental Investigation On Aluminum Conductors Prepared By High Drawing Speed

Foreign countries have already done research in high speed drawing for severaldecades and get the relatively complete drawing technology and drawing machine. Inchina, high speed drawing technology still study less; many specialist and scholar workhard for this. This thesis used Deform-3D to simulate one pass and multi-pass highspeed drawing process indifferent friction condition and velocity. Study the distributionof temperature and stress-strain，and optimizes the structure of drawing die and thetechnological parameter of drawing process. Get the high performance aluminum wireby optimizing drawing die. Get the results as follows：（1）in the simulation of high speed drawing. The drawing die angle and frictioncoefficient is the key factor. Temperature and equivalent strain increase as drawing dieangle increase. when the drawing die angle is11°,velocity is4m/s~5m/s, frictioncoefficient is0.08~0.12, material after drawing change uniformity, temperature keeproom temperature, well surface quality. Results get bad when friction coefficient over0.16, or drawing speed over6m/s；（2）in high velocity drawing of multi-pass, velocity can cause material store inentrance region of drawing die and breakage the wire. Increasing working area lengthcan solve this problem, improve the quality of wire. Drawing die angle in the last passeffect the product quality, by observing equivalent stress and equivalent strain,optimizing the last drawing die: drawing die angle is2°, equivalent stress andequivalent strain minimum, which is respectively133.036MPa and8.0530（3）when aluminum rod diameter is9.5mm,friction coefficient is0.08, velocityfor first pass is2m/s, simulate the high velocity drawing of multi-pass and studydistribution of equivalent stress, equivalent strain, axial stress and temperature. find theregularities of equivalent stress, equivalent strain and temperature：Equivalent stress,equivalent strain and temperature increase as pass number increase. equivalent stressincrease from108MPa to133MPa， equivalent strain increase from0.71to8.05,temperature increase from39.01°C to140.3°C when pass number increase from1to10. Velocity and friction coefficient affect equivalent stress and temperature：Equivalentstress and temperature increase as friction coefficient increase. the finial pass equivalentstress increase from133MPa to166MPa，temperature increase from140.3°C to185.4°Cwhen friction coefficient increase from0.08to0.1， equivalent strain decrease asvelocity increase，when velocity is increase from2m/s to4m/s，equivalent straindecrease from8.054to6.778（4）In multi-pass drawing, when the first pass velocity is2m/s and frictioncoefficient is0.1, the wire material after drawing by optimized drawing die strength is146MPa、elongation is4.2%and equivalent electric conductivity is63.18%IACS whichis better than common wire. No rupture phenomenon in drawing process, temperaturechange less, good dimensional accuracy.