▁non - fer r ous ▁met als ▁and ▁its ▁allo ys . ▁S izing ▁area : ▁the ▁final ▁dimension ▁of ▁the ▁drawing ▁material ▁is ▁determined ▁after ▁passing ▁the ▁s izing ▁area . ▁The ▁length ▁of ▁the ▁s izing ▁area ▁is ▁different ▁according ▁to ▁the ▁different ▁hard ness , ▁section al ▁area ▁and ▁lub ric ation ▁situation ▁of ▁the ▁drawing ▁material . ▁If ▁the ▁s izing ▁area ▁is ▁too ▁long , ▁the ▁fr iction ▁will ▁be ▁increased ▁in ▁the ▁stretch ing ▁process ▁and ▁the ▁m ould ▁temperature ▁will ▁be ▁elev ated ▁which ▁will ▁influence ▁the ▁service ▁life ▁of ▁the ▁m ould , ▁at ▁the ▁same ▁time , ▁the ▁tens ile ▁stress ▁will ▁be ▁increased ▁so ▁the ▁breaking ▁rate ▁of ▁the ▁metal ▁wire ▁will ▁rise . ▁If ▁the ▁s izing ▁area ▁is ▁too ▁short , ▁the ▁change ▁of ▁cone ▁angle ▁will ▁influence ▁the ▁size ▁of ▁the ▁material . ▁Exit ▁area ▁and ▁exit ▁cone ▁angle : ▁exit ▁area ▁is ▁the ▁last ▁part ▁passed ▁by ▁the ▁drawing ▁material ▁whose ▁function ▁is ▁to ▁protect ▁the ▁s izing ▁area ▁from ▁crack ing . ▁Exit ▁cone ▁angle ▁is ▁to ▁protect ▁the ▁quality ▁of ▁the ▁completed ▁metal ▁wire . ▁The ▁exit ▁area ▁should ▁not ▁be ▁too ▁short ; ▁otherwise , ▁the ▁out let ▁end ▁of ▁the ▁m old ▁is ▁easily ▁broken . ▁When ▁manufact uring ▁the ▁m old , ▁the ▁sharp ▁edge ▁connecting ▁the ▁exit ▁area ▁and ▁s izing ▁area ▁should ▁be ▁rub bed ▁into ▁circular ▁arc ▁to ▁avoid ▁the ▁ab ras ion ▁of ▁the ▁metal ▁wire . ▁ ▁Pre ca