为评价管材拉拔中的不均匀变形 ,提出用管材拉拔前后截面形状变化指数Q描述截面变形的不均匀性。用电阻应变片测试了黄铜管材变形后的表面残余应力 ,用管材截面小圆环法计算了截面径向和周向变形的分布 ,确定了管材拉拔中Q值对管材截面上变形分布及表面残余应力的影响规律。 In order to evaluate the non-uniform deformation in pipe drawing, the variation of cross-sectional shape Q before and after pipe drawing is proposed to describe the nonuniformity of cross-section deformation. The residual strain of the brass tube after deformation was tested by resistance strain gauges. The distribution of radial and circumferential deformation of the section was calculated by the small annular ring method. Deformation distribution of the tube in the section of tube drawing Effect of surface residual stress.