Study on conveying force area of cone-shaped parts in multi-pass hydroforming

摘要

The fairing is a deep and cone-shaped part, which is hard to process. Multi-pass hydroforming is proposed, and the advantage of loading by variable path is fully exploited. The forming of fairing was carried out based on numerical simulation, and then the stress-strain state of the conveying force area was studied. The effects of stress and strain on wrinkling are analyzed. The wrinkling was controlled by optimized path, which yielded the best path. The forming steps can be reduced and the surface quality can be improved by multi-pass hydroforming. The effects of circumferential stress and radial stress on wrinkling in the conveying force area were studied under different loading paths, and the relationship of the main strain and the wrinkling height was established. The changes of stress and strain in the conveying force area were controlled by optimizing the process parameters, and thus the wrinkling of cone-shaped parts is controlled.