Study on the hydroforming process for automobile radiator support members

Lee, Mun-Yong; Sohn, Sung-Man; Kang, Chang-Young; Lee, Sang-Yong

doi:10.1016/s0924-0136(02)00749-5

Cited by 11 publications

(5 citation statements)

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“…Although hydroforming technology has been known for about 30 years, the applications of hydroformed tubular components have significantly increased in the last ten years. The reasons for this are more advanced pressing control technology, and the availability of FEM-which supports the design of the tools and components [14,15]. However, real product control tests are still necessary to ensure the optimization of production technology [16], and the intent of these is to gather as much experimental data as possible to allow adequate modelling of the production process [17].…”

Section: Introductionmentioning

confidence: 99%

Exhaust system piping made by hydroforming: relations between stresses, microstructure, mechanical properties and surface

Kucharska

Moraczyński

2020

Archiv.Civ.Mech.Eng

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The subject of research is car exhaust system piping made of chromium–nickel steel of grade AISI304L with a unique, complex shape that was obtained by hydroforming technology. The purpose of the research was to determine the relation between the microstructure features, surface condition, hardness and the stresses on the external surface as determined by the sin2ψ X-ray method. We found that the stresses were tensile and correlated with the steel hardness, i.e. they were greater where the hardness was higher. Moreover, longitudinal stresses showed a relationship with pipe wall thickness, while circumferential stresses did so only partially. According to our data, the greatest value of stress determined in the pipe amounted to 290 MPa, and was close to the yield point of the strain hardened 304L steel. As depicted via XRD and SEM examination, the pipe stress level and hardness were influenced by the transition γ→α’. Furthermore, in the region of higher stress and hardness, the amount of martensite was 10 vol.%. We also noted that the pipe’s outer surface when subjected to friction against the die shows lesser roughness compared to its inner surface upon exposure to water under pressure.

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Section: Introductionmentioning

confidence: 99%

Exhaust system piping made by hydroforming: relations between stresses, microstructure, mechanical properties and surface

Kucharska

Moraczyński

2020

Archiv.Civ.Mech.Eng

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“…Ce dernier, permet aussi d'assurer une meilleure précision dimensionnelle et par conséquent moins de retour élastique et moins de problème dans la phase d'assemblage. Plusieurs travaux se sont intéressés à la modélisation et l'optimisation du procédé dans ce secteur [Asn03, Lee06,OhI06,Yua06]. Ce travail a pour objectif d'étudier ce procédé expérimentalement en variant plusieurs épaisseurs de tôle avec différents diamètres de matrice.…”

Section: Introductionunclassified

Caractérisation expérimentale de l’hydroformage

Nassraoui¹,

Radi²,

Zakaria³

2018

IncertFia

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RÉSUMÉ. La mise en forme par le processus d'hydroformage implique plusieurs phénomènes complexes et présente plusieurs types de non-linéarités (géométrique, matériel, etc.). Le développement d'une opération d'hydroformage nécessite beaucoup de tests pour déterminer avec précision les charges optimales de réalisation et d'obtenir une pièce sans défauts. Lors de l'essai de l'hydroformage de la tôle on est limité par la courbe de la déformée au centre de la pièce vu le montage de réalisation. Ce travail consiste à réaliser des essais expérimentaux d'hydroformage des tôles afin de déterminer la charge à appliquer avec l'épaisseur choisie. ABSTRACT. The shaping by the hydroforming process involves several complex phenomena and presents several types of non-linearities (geometric, material, etc.). The development of a hydroforming operation requires a lot of tests to accurately determine the optimal production loads and to obtain a part without defects. When testing the hydroforming of the sheet is limited by the curve of the deformation in the center of the piece in view of the mounting of realization. This work consists in carrying out experimental hydroforming tests of the sheets in order to determine the load to be applied with the chosen thickness. MOTS-CLÉS. Hydroformage, loi élastoplastique, anisotropie, mise en forme.

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“…Kim et al [2] have reduced trial-and-error for manufacturing of an automobile lower arm by a designing of the hydroforming process using the finite element method simulation. To eliminate the preforming process, Lee et al [3] developed the die having mechanical cam sliding system. The tube was simultaneously pre-bended and narrowed to approximately fit the part shape in die closing.…”

Section: Introductionmentioning

confidence: 99%

Hot gas bulging of sealed aluminium alloy tube using resistance heating

Maeno

Mori

Fujimoto

2014

Manufacturing Review

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-A hot gas bulging process of a sealed aluminium alloy tube using resistance heating was developed to simplify a control scheme in gas forming. The tube is bulged by the decrease in flow stress of the tube and the increase in internal pressure of compressed air during resistance heating. Hot gas bulging of the sealed aluminium alloy tube without and with axial feeding was performed. The effects of the initial internal pressure and the current density on the expansion ratio of the tube were examined. The decrease in temperature around the contact with the electrode was prevented by inserting a stainless steel ring having low thermal conductivity and high heat generation between the copper electrode and tube, and thus the bulging length was increased. It was found that the amount of bulging can be controlled for the sealed tube by heating without control of internal pressure during forming.

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Study on the hydroforming process for automobile radiator support members

Cited by 11 publications

References 0 publications

Exhaust system piping made by hydroforming: relations between stresses, microstructure, mechanical properties and surface

Exhaust system piping made by hydroforming: relations between stresses, microstructure, mechanical properties and surface

Caractérisation expérimentale de l’hydroformage

Hot gas bulging of sealed aluminium alloy tube using resistance heating

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