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试验研究了方管材无模拉伸时壁厚变化及断面形状变化的影响因素及影响规律。对于方形管材无模拉伸时 ,壁厚相对变化与拉伸后方形管材外边长、内边长的相对变化以及 ( 1-RS) 1/2 成线性关系
The influence factors and influencing rules of wall thickness change and cross-sectional shape change of square tube during die-free drawing were experimentally studied. For the square tube without die tensile, the relative change of the wall thickness is proportional to the outside edge of the square tube after stretching, the relative change of the inner edge length and (1-RS) 1/2