科研之友
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摘要
Aiming at the problem of the difficulties in forming caused by the special-shaped section of tube and the torsion angle of tube blank, the hydro-pressing forming method was proposed combining with the hydroforming forming and pressing forming. The theoretical analysis and experiment research on hydro-pressing forming process of special-shaped tube were carried out, based on the simulation scheme of orthogonal experiment, the significance of the effects of initial pressure, maximum pressure and shaping time on maximum thinning rate and the maximum springback of tube during the forming process of GH4169 superalloy thin-walled tube was investigated. The results show that the initial pressure and shaping time have the greatest influence on thinning rate and springback of tube respectively. The influence of the maximum pressure on thinning rate and springback of tube is not significant. The optimal parameter combination was obtained, and the distribution of wall thickness and the effect of springback were compared with the experimental results. The springback has little effect on the forming of parts, the springback error is controlled within 1%, the cross-section circumference error is 0.47%-0.8%. The maximum thinning occurs in the middle area of convex surface, and the wall thickness distribution of convex surface is uniform, the simulation results are consistent with the experimental results.
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