Active media-based form hardening of tubes and profiles

Neugebauer, Reimund; Schieck, Frank

doi:10.1007/s11740-010-0258-x

Cited by 17 publications

(6 citation statements)

References 2 publications

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“…For titanium alloys, HPPF can achieve the required elongations and guarantee the small radii of the tubular components more easily than hydroforming. Neugebauer and Schieck [ 9 ] developed a device with a maximum pressure of 80 MPa. The device was mainly used to form high strength steel tubes.…”

Section: Introductionmentioning

confidence: 99%

High Pressure Pneumatic Forming of Ti-3Al-2.5V Titanium Tubes in a Square Cross-Sectional Die

et al. 2014

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Abstract:A new high strain rate forming process for titanium alloys is presented and named High Pressure Pneumatic Forming (HPPF), which might be applicable to form certain tubular components with irregular cross sections with high efficiency, both with respect to energy cost and time consumption. HPPF experiments were performed on Ti-3Al-2.5V titanium alloy tubes using a square cross-sectional die with a small corner radius. The effects of forming of pressure and temperature on the corner filling were investigated and the thickness distributions after the HPPF processes at various pressure levels are discussed. At the same time, the stress state, strain and strain rate distribution during the HPPF process were numerically analyzed by the finite element method. Microstructure evolution of the formed tubes was also analyzed by using electron back scattering diffraction (EBSD). Because of different stress states, the strain and strain rate are very different at different areas of the tube during the corner filling process, and consequently the microstructure of the formed component is affected to some degree. The results verified that HPPF is a potential technology to form titanium tubular components with complicated geometrical features with high efficiency. OPEN ACCESSMaterials 2014, 7 5993 Keywords: high pressure pneumatic forming (HPPF); corner filling; strain rate sensitivity; electron back scattering diffraction (EBSD)

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Section: Introductionmentioning

confidence: 99%

High Pressure Pneumatic Forming of Ti-3Al-2.5V Titanium Tubes in a Square Cross-Sectional Die

et al. 2014

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“…Their results revealed that the hardness of the formed tube is locally dependent on the pressuretemperature curve, tube pre-heating temperature, and the tool temperature. Neugebauer and Schieck [19] developed a gas forming process with a maximum pressure of 80 MPa and a maximum temperature of 1000 • C for tube press hardening with integrated heat treatments to form high-strength products. Bach et al [20] heightened a pre-bent steel tube with the combination of gas forming and conductive heating.…”

Section: Introductionmentioning

confidence: 99%

Integration of Hot Tube Gas Forming and Die Quenching of Ultra-High Strength Steel Hollow Parts Using Low Pressure Sealed-Air

et al. 2022

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A low pressure sealed-air hot tube gas forming process of ultra-high strength steel tubes was developed not only to change the cross-section of the hollow products by bulging but also to increase the strength of components. Gas-formed components are typically formed by a controlled-gas pressure with extremely high internal pressure, which leads to affected production costs and safety. Moreover, compressing the gas with high pressure requires high energy during its preparation. Therefore, to simplify the internal pressure controlling system and improve the safety factor in gas forming processes, the sealed-air tubes are formed with a quite low initial pressure. The pressure of the sealed air increased with increasing temperature of the air inside the resistance-heated tube, and the bulging deformation was controlled only by axial feeding. The effects of the initial pressure and heating temperature on the bulging deformation and quenchability of the tubes, and the effect of the starting time of axial feeding on the bulging behavior were examined. Consequently, ultra-high strength steel bulged parts were produced even in low initial internal pressure and with the rapid heating of the tubes.

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“…To form Ti-alloy and high strength steel tubular component with a large expansion ratio, it is important to increase the deforming temperature and the internal pressure. Vadillo [13] and Neugebauer [14] studied the high strength steel forming process at elevated temperature and summarized the applications of high strength steel parts prepared by tube gas forming. Maeno [15] fabricated an ultrahigh strength steel hollow part by filling pressurized air high temperature deforming.…”

Section: Introductionmentioning

confidence: 99%

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

Liu

Wang

et al. 2015

Int J Adv Manuf Technol

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In order to investigate the deforming behavior of the tubular components with a large expansion ratio fabricated by tube gas forming technique, the Ti-3Al-2.5 V tubular components with 50 % expansion ratio were studied under the forming conditions of internal pressure and axial feeding at 800°C. Through thickness measurements, EBSD and tensile tests, the effects of axial feeding on deforming behaviors, such as thickness distribution, microstructure, and mechanical properties of Ti-3Al-2.5 V tubular components, were investigated in details. The results showed that the average thinning ratio of the bulging area could be reduced significantly and the thickness distribution of the workpiece was more uniform with increasing of the feeding. Feeding length influenced the microstructure and strength of components. When the axial feeding ratio (actual feeding length/theoretical feeding length) was 56 %, the component had even higher tensile strength than the original tube because of the grain refinement. If the axial feeding was excessive large, the grain size became adversely coarser, which in turn reduced the tensile strength. These investigations illustrated that tube gas forming under high pressure had potential for fabricating complicated shaped titanium alloy tubular components by reasonably designing and controlling the deforming process.

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Active media-based form hardening of tubes and profiles

Cited by 17 publications

References 2 publications

High Pressure Pneumatic Forming of Ti-3Al-2.5V Titanium Tubes in a Square Cross-Sectional Die

High Pressure Pneumatic Forming of Ti-3Al-2.5V Titanium Tubes in a Square Cross-Sectional Die

Integration of Hot Tube Gas Forming and Die Quenching of Ultra-High Strength Steel Hollow Parts Using Low Pressure Sealed-Air

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

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