非对称异形截面环件的冷辗扩成形力能参数与圆度影响规律研究

以非对称异形截面环件高压油管连接套筒为研究对象, 采用对称冷辗扩工艺, 应用Simufact软件对冷辗扩成形过程进行了模拟分析, 研究了驱动辊转速和芯辊进给速度对冷辗扩过程中轧制力、轧制力矩和环件圆度误差的影响. 结果表明: 降低芯辊进给速度或增大驱动辊转速, 能有效降低两道次冷辗扩过程中的轧制力和轧制力矩; 驱动辊转速为12 rad●s^-1, 芯辊进给速度为1.0 mm●s^-1时, 第一道次冷辗扩定位凹槽(缩口)内外圈圆度质量最优, 圆度误差分别为0.1735 mm和0.1864 mm; 驱动辊转速为14 rad●s^-1, 芯辊进给速度为1.2 mm●s^-1时, 第二道次冷辗扩缩口内外圈圆度质量最优, 圆度误差分别为0.0849 mm和0.1202 mm.

The impact of force parameters on roundness of cold ring rolling of asymmetric abnormal cross-section ring

The process of high-pressure oil pipe connecting sleeve of asymmetric abnormal cross-section ring is studied in this paper. The symmetrical cold ring rolling technology is adopted, and the cold ring rolling process is simulated and analyzed by Simufact software. The effects of driving roller’s rotation speed and mandrel feed speed on the rolling force, rolling torque and ring roundness error in cold ring rolling process of connecting sleeve are explored. The results show that the rolling force and rolling torque can be effectively reduced by decreasing the mandrel feed speed or increasing the driving roller’s rotation speed. When the driving roller’s rotation speed is 12 rad●s^-1 and the mandrel feed speed is 1.0 mm●s^-1, the first pass cold rolling has the best roundness quality of inner and outer rings of the cold rolling locating groove (shrink mouth) and the roundness errors are 0.1735 mm and 0.1864 mm respectively. When the driving roller’s rotation speed is 14 rad●s^-1 and the mandrel feed speed is 1.2 mm●s^-1, the second pass cold rolling has the best roundness quality of inner and outer rings of the cold rolling shrink mouth and the roundness errors are 0.0849 mm and 0.1202 mm respectively.