小断面收缩率楔横轧件的变形规律

Deformation rule of light area reduction shafts by cross wedge rolling

对楔横轧轴类零件的成形过程进行有限元数值模拟与轧制实验.从断面收缩率角度研究了轧件的金属变形特点,发现小断面收缩率与常规断面收缩率的分界点在35%左右.对比分析了小断面收缩率与常规断面收缩率轧件的金属变形规律.结果显示:小断面收缩率轧件的主要变形发生在轧件外层附近,而常规断面收缩率轧件的主要变形是在轧件内部;小断面收缩率轧件比常规断面收缩率轧件存在更大的轴向拉伸不均匀变形,易导致轧件在横截面上呈现出椭圆化.

The forming process of shafts by cross wedge rolling （CWR） was presented by numerical simulation and rolling experi- ment. The metal deformation characteristics of roiled pieces were studied from the view of area reduction. It is found that the cut-off point between rolled pieces with light area reduction and conventional area reduction is roughly at 35%. Comparative analysis was mainly focused on the deformation rule of rolled pieces with light area reduction and conventional area reduction. The results show that the main deformation of roiled pieces with light area reduction is near the outer while that with conventional area reduction is inside. A more uneven axial tensile deformation exists in rolled pieces with light area reduction than in rolled pieces with conventional area re- duction, leading to a heavier cross section elliptical deformation in rolled pieces with light area reduction.