多楔楔横轧42CrMo4大型空心长轴类零件分析（英文）

Multi-wedge Cross Wedge Rolling Process of 42CrMo4 Large and Long Hollow Shaft

大型厚壁空心长轴类零件是工业装备中的关键零部件,本研究采用多楔楔横轧成形该类零件。首先,推导多楔楔横轧长轴空心件的侧楔偏转角公式,为多楔楔横轧模具的设计奠定了基础。然后,研究展宽角对单楔楔横轧厚壁空心件的影响规律,发现相对于轧制小直径空心轴,展宽角的选择范围可以扩大,内孔椭圆度也能得到控制。同时发现模具的顶面脱空也能控制内孔椭圆度。最后,建立双楔楔横轧轧制大型厚壁空心长轴类零件的有限元模型,模拟了成形过程,监测对称面的内孔椭圆度,有限元计算的内孔椭圆度为4.98%,轧制实验值为5.56%。结果表明:双楔楔横轧大型厚壁空心长轴类零件是可行的。

Large and long thick-walled hollow shafts are the key parts of industry equipments, which are formed by the multi-wedge cross wedge rolling（MCWR）. In the present paper, first, the deflection angle equations of side-wedges applied at the multi-wedge cross wedge rolling of hollow shafts were derived, which lay important foundation for designing the MCWR mold. Second, the spreading angle＇s impacts on single-wedge cross wedge rolling（CWR） of thick-walled hollow shaft-part were discussed. And, compared to roll small diameter of hollow shaft, the ellipticity of the large and long thick-walled hollow shaft could be controlled, and the selection range could be extended. At the same time, it was also found that the ellipticity could also be controlled by empty top surface of the mold. At last, the FE model of double-wedge cross wedge rolling of large and long thick-walled hollow shaft was established. The forming process was simulated, and the ellipticity of symmetrical cross-section was monitored. The ellipticity of large and long thick-walled hollow shaft was controlled well. The simulated ellipticity of symmetrical cross-section is 4.98%, and the experimental ellipticity is 5.56%. The results indicate that it is feasible to produce large and long thick-walled hollow shafts with double-wedge CWR.