Ultrasonic Tube Hydroforming, a New Method to Improve Formability

Shahri, Seyyed Ehsan Eftekhari; Boroughani, S. Y. Ahmadi; Khalili, Khalil; Kang, Beom-Soo

doi:10.1016/j.protcy.2015.02.014

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…This enhanced formability manifests itself tangibly as both a more uniform wall thickness and better corner filling during the forming process. These advantages are particularly important as they are considered areas of concern in hydroforming operations and occur because high frequency vibrations result in a tiny opening (or gap) between the tube and the die for just a fraction of a second which in turn causes a momentary change in the condition between the tube and die which subsequently allows for easier expansion (Eftekhari Shahri, et al, 2014). Using this method Shahri et.…”

Section: Ultrasonic Tube Hydroformingmentioning

confidence: 99%

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Research directions in hydroforming technology

Bell¹,

Tamimi²,

Corney³

et al. 2016

AIP Conference Proceedings

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This paper both summarizes and explores the literature published between 1995 and 2015 on enhancing and extending hydroforming technology. M any different research areas have been proposed, all of which try to enhance the well-established manufacturing process by either improving formability or reducing costs. Each of the technological variations are first described and then their uses, benefits, drawbacks, and applications are discussed and summarized.

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Section: Ultrasonic Tube Hydroformingmentioning

confidence: 99%

“…were able to see a considertable increase in the corner filling ratio of a tube with a square cross section shown schematically below in figure 9. a) b) FIGURE 9. Hydroforming without (left) and with (right) ultrasonically induced vibrations (Eftekhari Shahri, et al, 2014) Electrohydraulic Forming…”

Section: Ultrasonic Tube Hydroformingmentioning

confidence: 99%

Research directions in hydroforming technology

Bell¹,

Tamimi²,

Corney³

et al. 2016

AIP Conference Proceedings

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“…In general, the mechanism of effectiveness of ultrasonic vibration in metal forming processes is divided into two categories: surface effects (macroscopic) and volume effects (microscopic) [8][9][10][11]. the surface effects of ultrasonic vibration in the metal forming processes are the reduction of sliding friction at the contact surfaces of the die and the workpiece (ultrasonic lubrication) [12,13] and the reduction of spring back and dimensional and geometric stability of the workpiece [14]. The volume effects of ultrasonic vibration in metal forming processes also include changes in brittleness and plasticity (acoustic softening or hardening property) or the same effect of Blaha and Langenecker [4], signi cant reduction of forming force [10], increasing formability [12] and changes in microstructure [15].…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the subject of the forthcoming research on the application of ultrasonic vibration in hydroforming, Eftekhari Shahri et al [14] investigated the improvement of formability in the tube hydroforming process by applying ultrasonic vibration. This process was performed by simulation and experimentally to convert copper tube transversely to square pro le.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Ultrasonic Vibration Effects on Punch Radial in Sheet Hydroforming Process

Ghasemi

Elyasi

Baseri

et al. 2021

Preprint

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Nowadays, one of the metal forming processes that are widely used in industries is sheet hydroforming. Because of high complexity and sensitivity, this process needs precise calculations in the die and method to control metal flow correctly and prevent defects. Therefore recently, new processes were combined to this process to increase precision and effectiveness. For example, ultrasonic vibration assistance forming. Using hydroforming and ultrasonic vibration as new methods were studied in several research types separately, and each of them redounded to different analyses and improvements in the process. Even synchronic use of these two methods was studied in some metal forming processes such as tube hydroforming, but it has not been studied in sheet hydroforming. Therefore the aim of this research is the experimental study of St14 sheet hydroforming ultrasonic vibration assistance. For this purpose, ultrasonic vibration (with 20 KHz frequency and 4μm amplitude) was applied to a hydromechanical deep drawing die into punch radial in the hydroforming process. Then process parameters consisting of LDR, maximum height, forming force, safe working zone, and thickness distribution were determined and compared in four case states conventional deep drawing(CDD), hydroforming deep drawing(HDD), ultrasonic vibration assistance deep drawing(UDD) and ultrasonic vibration assistance hydroforming deep drawing(UHDD). Results indicated that applying ultrasonic vibration into the sheet hydroforming process increases LDR and the maximum height of the cup, decreases forming force and develops a safe working zone. Also was very effective in thickness distribution and decrease of sheet thinning in critical sections.

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“…4 Using the hydroforming process, it is possible to produce a tube component that its cross-section is varied along its axis. 5,6 Because of this unique advantage, the hydroforming process is a useful manner to manufacture integrated and seamless parts with a smaller number of production processes and more desirable mechanical properties, only in one step. 7 Hydroforming method was originally invented to form aluminum tubes but, its usage was rapidly developed for other materials such as steel, 8 copper, 9 magnesium 10 and titanium.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive damage criterion in tube hydroforming

Pourhamid

Shirazi

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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In the present study, the Johnson-Cook damage model is proposed as a comprehensive damage criterion to predict all types of probable failures in tube hydroforming process. Also, the Johnson-Cook material model is used to predict the profile of hydroformed tubes and their dimensions. The validity of numerical results was verified using experimental results obtained in this study. Moreover, because of the importance of friction force in this process, existing between the tube and die, the friction coefficient is determined using the ring compression test, separately. The comparison of experimental and numerical results shows that Johnson-Cook damage model can predict all of the possible failures in tube hydroforming process correctly, both in terms of location and loading conditions. And this model does not predict any failure if, the tube is hydroformed perfectly. Additionally, it was cleared that the Johnson-Cook material model is a proper model to predict the profile of hydroformed tubes with remarkable accuracy. Also, it was found that the loading path and creation of a proper wrinkling have a determinative and vital role in the prosperity of the process.

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Ultrasonic Tube Hydroforming, a New Method to Improve Formability

Cited by 15 publications

References 10 publications

Research directions in hydroforming technology

Research directions in hydroforming technology

Experimental Study of Ultrasonic Vibration Effects on Punch Radial in Sheet Hydroforming Process

A comprehensive damage criterion in tube hydroforming

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