Overview of Quick Plastic Forming Technology

Krajewski, Paul E.; Schroth, James G.

doi:10.4028/0-87849-435-9.3

Cited by 15 publications

(20 citation statements)

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“…The successful implementation of QPF technology requires a shift away from the low-volume assumptions typically connected with prior applications of BF processes to aerospace or niche automotive products. On the other hand, material preparation is much more restrictive: controlled microstructure with very small mean grain size are generally required [2,3].…”

Section: Introductionmentioning

confidence: 99%

Blow forming of AZ31 magnesium alloy at elevated temperatures

et al. 2009

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In this work, the forming behaviour of a commercial sheet of AZ31B magnesium alloy at elevated temperatures is investigated and reported. The experimental activity is performed in two phases. The first phase consists in free bulging test and the second one in analysing the ability of the sheet in filling a closed die. Different pressure and temperature levels are applied. In free bulging tests, the specimen dome height is used as characterizing parameter; in the same test, the strain rate sensitivity index is calculated using an analytical approach. Thus, appropriate forming parameters, such as temperature and pressure, are individuated and used for subsequent forming tests. In the second phase, forming tests in closed die with a prismatic shape cavity are performed. The influence of relevant process parameters concerning forming results in terms of cavity filling, fillet radii on the final specimen profile are analysed. Closed die forming tests put in evidence how the examined commercial magnesium sheet can successfully be formed in complicated geometries if process parameters are adequately chosen

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Section: Introductionmentioning

confidence: 99%

Blow forming of AZ31 magnesium alloy at elevated temperatures

et al. 2009

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“…In recent years, quick plastic forming (QPF) has been developed by US car manufacturers as a hot blow forming process, which is capable to produce mass aluminum panels [3,4]. For aluminum and magnesium tubular components, hot metal gas forming (HMGF) with higher forming temperature has also been developed using low internal pressure gas, which has drawn much attention due to the advantage of high efficiency [5,6].…”

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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“…The problems can be counteracted by improving the forming temperature. In recent years, superplastic forming (SPF) were popularly used to form complex components at elevated temperature [1,4,5]. Nevertheless, the disadvantages of localized thinning, expensive microstructure refining processing, low productive efficiency, and high deforming temperature in superplastic forming limit applications of Ti-alloy SPF.…”

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confidence: 99%

“…Nevertheless, the disadvantages of localized thinning, expensive microstructure refining processing, low productive efficiency, and high deforming temperature in superplastic forming limit applications of Ti-alloy SPF. Thus, it is urgent need to develop a forming technology with low energy consumption, high efficiency, and without microstructure refining processing.Quick plastic forming, developed by General Motors to form AA5083 aluminum automobile body panels, affords comparable capabilities yet at higher production rates due to lower forming temperature, higher strain rates, and without refining grains [5,6]. R. Neugebauer [7], A.W.…”

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Loading path and microstructure study of Ti-3Al-2.5V tubular components within hot gas forming at 800 °C

Liu

Wang

et al. 2016

Int J Adv Manuf Technol

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Hot tube gas forming is a forming technology, whose ultimate goal is forming a uniform cross-section blank tube into a complex shape die cavity with varying crosssections without necking, wrinkling, or buckling by applying of axial feeding and internal pressure at elevated temperature. In this paper, the effects of feeding speed and internal pressure on the quality of formed tubular components were studied by theoretical analysis, FEM simulation, and experiment. The microstructure evolutions at four typical positions were analyzed by electron back-scattered diffraction (EBSD). The mechanical properties of tubular component were tested by the uniaxial tensions and hardness tests. A good tubular component can be formed under a two-stage loading path at 800°C, the feeding speed is 0.1 mm/s and the internal pressure is 5 MPa during the first feeding stage while the feeding speed is 0.2 mm/s and the internal pressure is 7 MPa during the second feeding stage. At the forming zone, the grains are significantly elongated along the hoop direction. Compared with the as-received tube, the tensile strength of parts reduces about 6 % along axial direction.Titanium alloys are found extensive applications including aerospace, marine, chemical, and medical industries due to their excellent properties such as good high temperature performance, high specific strength, good creep resistance, biocompatibility, and good corrosion resistance [1]. Ti-alloy complex tubular components are widely used in petrochemical equipment, vehicle exhaust system, sports equipment and piping system of ship, air-inlet system, and hydraulic control system of aerospace and aviation [2, 3]. However, for titanium alloy, it is hard to be formed at room temperature because of high springback and low plasticity. The problems can be counteracted by improving the forming temperature. In recent years, superplastic forming (SPF) were popularly used to form complex components at elevated temperature [1,4,5]. Nevertheless, the disadvantages of localized thinning, expensive microstructure refining processing, low productive efficiency, and high deforming temperature in superplastic forming limit applications of Ti-alloy SPF. Thus, it is urgent need to develop a forming technology with low energy consumption, high efficiency, and without microstructure refining processing.Quick plastic forming, developed by General Motors to form AA5083 aluminum automobile body panels, affords comparable capabilities yet at higher production rates due to lower forming temperature, higher strain rates, and without refining grains [5,6]. R. Neugebauer [7], A.W. Dykstr [8], W. Xin [9], and B. Dykstra [10] set up hot metal gas forming (HMGF), and mainly investigated and applied the process on forming of aluminum and magnesium alloy components. J. Liu [11,12], utilizing the mechanical pre-forming, investigated the AA5083 sheet gas forming using argon gas at 400°C. W.J. Kim [13] formed an Al-Mg-Cr aluminum suspension component successfully at 520°C under a constant gas pressure of 7 MPa d...

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Overview of Quick Plastic Forming Technology

Cited by 15 publications

References 0 publications

Blow forming of AZ31 magnesium alloy at elevated temperatures

Blow forming of AZ31 magnesium alloy at elevated temperatures

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

Loading path and microstructure study of Ti-3Al-2.5V tubular components within hot gas forming at 800 °C

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