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...International forum on energy environment and sustainable development ifeesd maximum cross section reduction ratio of billet in a single wire forming pass based unified strength theory xiaowei li school civil engineering panzhihua university china department tunnel underground southwest jiaotong chengdu lilixxxwww com keywords drawing extrusion abstract for obtaining the mcsrr any equation estimating was obtained it is proved that similar to included contribution both intermediate principal shear stress varying tension compression tcr material mechanical property developed can reasonably apply variety materials if equal addition ranges ductile brittle are introduction classified as treated three dimensional axisymmetric problem analysis metalworking process used reduce by pulling through or series die s although during different from because pulled rather than pushed usually performed at room temperature thus cold working simplicity suppose inner wall conical smooth radial direction pl...