关键词: 护环, 有限元, 胀形, 7075铝合金, 电导率, 回归再时效, 喷射成形, 强度

Abstract: The process of hydraulic bulge of retaining rings with the external pressed liquid is a new technology. This paper analysed the effect of force paremeters on forming precision, calculated the alteration of stress, strain and load, estimated the residual stresses by the FEM for large elasto-plastic strains, and calculated the dimensions of piece in ring form before bulge by the simulation in opposite direction. The calculation coincides with to hexperiment well.

Key words: 护环, 有限元, 胀形, 7075 alloy, conductivity, retrogression and re-aging, strength, spray forming