Topic
Hydroforming
About: Hydroforming is a research topic. Over the lifetime, 2796 publications have been published within this topic receiving 26293 citations. The topic is also known as: Bulge forming.
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01 Jan 2004
TL;DR: In this paper, the effect of hydroforming on downstream crashworthiness of aluminum tubes was considered and the theoretical effect on mean crush load can be as much as 25% different than without considering forming effects.
Abstract: This paper considers the effect of hydroforming on the downstream crashworthiness for tubes. Three types of aluminum tubes were chosen as examples. Hydroforming will affect both strains and thickness of a tube, which will have opposite effects on the tubes mean crush load for crashworthiness. For hydroforming, the theoretical assumptions of no friction versus sticking friction will result in very different values for thickness, strains, stresses and mean loads when the corner radius is less than half the original tube radius. The theoretical effect on mean crush load can be as much as 25% different than without considering forming effects.Copyright © 2004 by ASME
6 citations
TL;DR: In this article, an analytical model for regular planar polygon tube hydroforming (THF) was presented, which is able to predict field variables such as stresses and strain distribution, thinning rate distribution, and deformed shape at a particular pressure.
6 citations
TL;DR: In this paper, the outflow characteristics of a pressure medium used for a sheet hydroforming process have been investigated, focusing on correlation with sheet deformation, and the correlation between the critical punch stroke for fracture and the hydraulic pressure in the flange area was also examined.
Abstract: In our series of studies, the outflow characteristics of a pressure medium used for a sheet hydroforming process have been investigated. The variation of hydraulic pressure during a square-cup sheet hydroforming process was examined, focusing on correlation with sheet deformation. In the initial stage, the outflow of the pressure medium remained stable because a greater extent of pre-bulging arose around the die shoulder just after the process commenced. When the pre-bulging ceased, the pressure medium was sealed in the chamber. Thus, the hydraulic pressure began to increase rapidly within the chamber, and fell in the flange area. The punch stroke at which the hydraulic pressure in the chamber began to rise was highly dependent on the blank holding force because the height of pre-bulging was determined by this force. When the sheet conformed completely to the die shoulder, the pressure medium was also sealed at the shoulder. Therefore, the hydraulic pressure on the die shoulder as well as in the flange area started to fall. The correlation between the critical punch stroke for fracture and the hydraulic pressure in the flange area was also examined.
6 citations
TL;DR: In this article, an analytical model for determining pressure-feed loading paths is formulated for the hydroforging process, which is a hybrid forming operation whereby a thick tube is formed to a desired geometry by combining forging and hydroforming processes.
6 citations
01 Jan 2012
TL;DR: In this paper, a technology scheme consisting of hydroforming with axial feeding by using moving dies is proposed for complicated thin-walled circular superalloy parts with irregular section.
Abstract: Hydroforming is an effective method for manufacturing thin-walled parts.In order to develop a forming process of complicated thin-walled circular superalloy parts with irregular section,a technology scheme is proposed consisting of hydroforming with axial feeding by using moving dies.Meanwhile,an analysis is made of stress characteristic and strain state based on plasticity method and incremental theory,and its finite element models are built.The effect of the key process parameters,including the height of forming area for cylinder blank and loading paths of cavity pressure on the quality of the parts,is explored with the assistance of numerical simulations and verification experiments.Furthermore,the failure modes during the forming process,including excessive wall thinning,accumulation folding and configurational asymmetry are discussed,and the technological parameters are optimized.The results indicate that the proposed technological method is feasible for the accurate integral forming of complicated thin-walled circular parts with irregular section;moreover,the parts with uniform thickness distribution and high quality can be successfully formed by using optimal height of forming area and loading path of cavity pressure.
6 citations