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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TL;DR: In this article, the effect of different process parameters on tube hydroforming was investigated by numerical analysis and also the Taguchi Technique for optimization on Aluminum alloy Al99. And the mutual effect on Aforesaid process parameters, including internal pressure, axial feed, material properties, and other processing conditions were studied.
17 citations
TL;DR: In this article, the friction coefficient between tube and die in guide zone of tube hydroforming was obtained, where the tube is expanded by an internal pressure against the tool wall and a friction force at the contact surface between the tube and the tool occurs.
17 citations
TL;DR: In this article, a novel approach of online measurement based on digital speckle correlation method is put forward to determine flow stress of thin-walled tube, a simple experimental tooling is developed and free-bulged tests are performed for 304 stainless steel and H62 brass alloy tubes.
Abstract: The flow stress, used to describe the plastic deformation behavior of thin-walled tube, is one of the most important parameters to ensure reliable finite element simulation in the tube hydroforming process. In this study, a novel approach of on-line measurement based on digital speckle correlation method is put forward to determine flow stress of thin-walled tube. A simple experimental tooling is developed and free-bulged tests are performed for 304 stainless steel and H62 brass alloy tubes. An analytical approach is proposed according to the membrane theory and the force equilibrium equation. The developed method is validated by means of FE simulations. The results indicate that the present method is acceptable to define the flow stress in the tube hydroforming process.
17 citations
Patent•
22 Mar 1995
TL;DR: A hydroforming process and apparatus for manufacturing components of a vehicle exhaust or intake manifold is described in this paper. But this process is not suitable for vehicular applications, as it requires a large number of dies to form a compound bend in the pressurized tube.
Abstract: A hydroforming process and apparatus for manufacturing components of a vehicle exhaust or intake manifold. The hydroforming process is utilized to form a tubular member to the desired configuration for use in a manifold. The tubular member is loaded into a hydroform press and filled with a suitable liquid. The liquid within the tube is pressurized in order to maintain a predetermined internal fluid pressure which prevents collapse and crimping of the tube during forming. The hydroform press includes two sets of dies to form a compound bend in the pressurized tube. Upper and lower dies close on the tube first to bend the tube in a vertical plane. Horizontal dies are wedged inwardly spreading the first die set and bending the tube in a horizontal plane. As a result, a compound configuration may be placed on the tube making it suitable for use in a vehicle manifold.
17 citations
TL;DR: Based on the proposed multi-operation hydroforming with the non-uniform blank holding pressure unit, using the poor formability materials including aluminum alloy and high-strength steel alloy, the effects of key process parameters including the shape of pre-forming punch, preforming depth, blank shape and cavity pressure, punch movement on the finally formed parts were discussed as mentioned in this paper.
17 citations