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 paper, a combination method of beneficial wrinkles and preform shape is proposed to solve the problem of non-uniform thickness distribution during hydroforming of a variable diameter tubular component.
Abstract: A combination method of beneficial wrinkle and preform shape is proposed to solve the problem of non-uniform thickness distribution during hydroforming of a variable diameter tubular component The effect of loading path for the hydroform part and the preform shape are simulated by LS-DYNA At the same time, the wall thickness deviation of the maximum and minimum of the hydroformed part is considered as the optimal target and the loading path for the preform shape is optimized to obtain the beneficial wrinkles by response surface methodology Simultaneously, hydroforming experiments were conducted to verify the simulation results Study shows that the loading path plays an important role in the forming of the beneficial wrinkles, which influence the cracking and the wrinkling defects Only the loading path is appropriate can the beneficial wrinkles be formed and the wrinkles are flattened in the subsequent calibrating process Response surface methodology is an effective way to obtain the optimal loading path, and the desired loading path can be achieved by controlling the relationship of the axial feeding and the internal pressure
15 citations
Patent•
02 Mar 1999
TL;DR: In this paper, the authors proposed a simple and small facility and a short tact to provide a hydroforming method, wherein a block cross sectional product including a deformed portion can be accurately manufactured from a pipe material in a simple process.
Abstract: PROBLEM TO BE SOLVED: To provide a hydroforming method, wherein a block cross sectional product including a deformed portion can be accurately manufactured from a pipe material in a simple process with a simple and small facility and a short tact, so that manufacturing cost can be significantly reduced SOLUTION: When a product having a sectional area of narrower width than diameter of a pipe material at least at one part of entire length is formed from the pipe material which is bent in a flat plane, a bent product formed by bending the pipe material into a desired flat shape is inserted between a pair of slide blocks 3 of a lower die, which can move in right/left directions inside an outer die Then, an upper die 1' having an upper molding face is actuated under the condition that the bent product is filled with liquid and pressurized Thereby, a pair of the slide blocks 3 are moved in an approaching direction, and the bent product is continuously deformed with the slide blocks 3 and the upper molding face and is clamped Also, an inner pressure of the bent product is continuously raised under the condition that the upper die 1' is locked against the lower die 1, so that pressurization molding is performed till the product has a target cross sectional shape COPYRIGHT: (C)2000,JPO
15 citations
TL;DR: In this article, the deformation mode and the process were analyzed during hydromechanical deep drawing of aluminum alloy complex-shaped components with a doubly curved surface, formed by conventional deep drawing and drop stamping, and the results showed that the reasonable chamber pressure to avoid the above defects is 10-30 MPa.
15 citations
01 Jan 2004
TL;DR: JFE steel supplies a wide range of advanced products and technologies to automotive industry as discussed by the authors, such as stainless steel products for exhaust system, electrical steel sheets with outstanding high frequency properties, ERW tubes for hydroforming, bar products for bearings and power train parts iron powder technology for high density sintered parts and lightweight composites for interior parts.
Abstract: JFE Steel supplies a wide range of advanced products and technologies to automotive industry. This report first introduces new high strength steel products which contribute to reduction of automobile weight and improvement of crashworthiness, coated steel products for extended automobile life, and evaluation and application technologies of steel products. In addition, several other products are also introduced, such as stainless steel products for exhaust system, electrical steel sheets with outstanding high frequency properties, ERW tubes for hydroforming, bar products for bearings and power train parts iron powder technology for high density sintered parts and lightweight composites for interior parts.
15 citations
TL;DR: In this article, a numerical approach based on the acceleration of plastic strain (i.e., the second derivation) was applied to compute the hydroforming strain limit diagram of tubular material (Al 7020-T6).
Abstract: In this study, forming limit diagram (FLD) of tubular material (Al 7020-T6) was determined numerically and experimentally. A set of experimental bulge tests were carried out to determine FLD under combined internal pressure and axial feeding. Also, a numerical approach which is based on the acceleration of plastic strain (i.e., the second derivation) was applied to compute the hydroforming strain limit diagram. Based on this method, the localized necking would be started when the acceleration of the max plastic strain got its maximum value. Finally, the numerical FLD was verified by experimental test results on the aluminum tube 7020-T6 and a good agreement between the proposed method and the experimental works was observed.
14 citations