Effect of thread lift angle on hydroforming performance of spiral bellows
To deeply explore the deformation behaviors of spiral bellows in hydroforming process,taking 304 stainless steel round tube as the research object,the hydroforming process of tube billet with different thread lift angles was analyzed by finite element simulation meth-od.The effects of different thread lift angles on the expansion height,thinning rate and wave height uniformity of the threaded section of spiral bellows were studied.The results show that under the same internal pressure,with the increase of thread lift angle,the expansion height and the maximum thinning rate of the threaded section decrease significantly,and the wave height uniformity increases,while the change of wall thickness thickening rate is not obvious.Finally,the experimental verification of spiral bellows hydroforming was carried out with thread lift angle of 15°.The results show that inappropriate matching of internal pressure and fill volume mainly leads to two de-fects of center rupture and wrinkling at both ends.When the hydroforming process parameters were:shaping pressure of 140 MPa,fill volume of 15 mm,and axial feed rate of 1.5 mm·s-1 for the pusher head,the spiral bellow parts with excellent forming quality were ob-tained,and the experimental results are basically consistent with the finite element simulation results.
spiral bellowhydroformingfinite element simulationthread lift angleforming performance
万方数据
维普
