为实现径厚比达1 400的镍基合金薄壁筒减薄旋压,研究工艺参数对旋压稳定性的影响,建立超薄壁大径厚比筒形件旋压的数值仿真模型,分析主轴转速和旋轮进给速度等工艺参数对旋压变形稳定性的影响规律和不同工艺参数下金属材料的流变规律,结合数值模拟的结论旋压出径厚比达1 400的筒形件.结果表明:当主轴转速为160 r/min、旋轮进给速度为40 mm/min、旋轮圆角半径为6mm,减薄率为30％、工模间隙率为5％时,旋压过程中工件内壁将出现一个均匀的锁模环,加载区局部材料在锁模环的约束下发生定向流变,使超薄壁筒形件在旋压过程中保持足够的稳定性.%The effects of process parameters on the stability of spinning were studied to achieve the power spinning of nickel-based alloy thin-walled tube with diameter-thickness ratio of 1 400. The numerical simulation model of the spinning of extra-thin-walled tube with high diameter-thickness ratio was established, the effects of process parameters such as the spindle speed and the spin roller feed rate, on the spinning deformation stability were analyzed. The rheological regulation of the metal material was discussed. A tube with diameter-thickness ratio up to 1 400 was spun with the conclusion of numerical simulation. The results show that, with spindle speed of 160 r/min, spin roller feed rate of 40 mm/min, spin roller fillet radius of 6 mm, thinning rate of 30%, clearance ratio of 5%, a uniform mold-lock ring is generated on the inner wall of the tube in the spinning process. The directional flow and deformation of local materials in load restriction maintains the stability of the extra-thin-walled tube in the spinning process.
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