减震器储油管内高压胀形加工方法的研究

Research of the Tube Internal Pressure Forming of Shock Absorber Oil Pipe Manufacture Method

一种基于内高压胀形理论加工减震器储油管的新方法。主要分析了管材在胀形过程中轴向应力和环向应力的变化过程,讨论了在胀形过程中产生褶皱、管壁破裂以及壁厚变化不均匀等失效形式与各向应力变化之间的关系。最后通过DYNAFORM软件的仿真分析验证了该方法的成形效果优于机械胎具刚性冲压式胀形方法,对不同压力和推制速度的多次仿真分析,得到了最佳的成形压力、推制速度和推制时间等参数,同时也验证了储油管胀形压力的计算准确性。

A kind of new shock absorber oil pipe manufacture method is studiedbased on tube internal pressure forming. The process of the axialstresses and the hoop stresses is analyzedduringthe tubesvolume expansion. The relationship between stresses changes in alldirections and different failures is discussed. Thesefailures include folds, pipe cracked and uneven wall thickness during tube bulgingetc. At last the method is verified by DYNAFORM software. Simulation demonstrates that the formability has been improved than mechanical rigidity mold stamping approach. The aptimum forming stress ,speed and time are chosen q^er many simulated analysis. Meanwhile, the calculation accuracy of oil tube bulging pressurehas been tested.