Development of an analytical model for warm deep drawing of aluminum alloys

Kim, Hong Seok; Koç, Muammer; Ni, Jun

doi:10.1016/j.jmatprotec.2007.06.046

Cited by 28 publications

(14 citation statements)

References 18 publications

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“…The general conclusion obtained from FEM and analytical models was that the improvement in the drawability is achieved under non-isothermal conditions where the punch is cooled to increase the material strength and the blank holder-die set is heated to decrease the flow stress of the flange region. The errors between real experiments and FEM analyses were found due to inaccurate assumptions of the contact conditions between tooling and blank [27,28]. This result supported the inconsistency in temperatures between the tooling system and the work piece material.…”

Section: Introductionmentioning

confidence: 61%

“…Other consequential studies to determine the forming temperatures and proper temperature distribution on material were conducted by finite element analyses (FEM) and analytical models [2,9,19,[25][26][27][28]. The general conclusion obtained from FEM and analytical models was that the improvement in the drawability is achieved under non-isothermal conditions where the punch is cooled to increase the material strength and the blank holder-die set is heated to decrease the flow stress of the flange region.…”

Section: Introductionmentioning

confidence: 99%

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Development of Forming Temperature Curves for Warm Deep Drawing Process Under Non-isothermal Conditions

et al. 2015

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Temperature is the main effective process parameter in the warm deep drawing (WDD) process to improve the formability of light-weight engineering materials, and this feature requires the accurate measurement and assessment of temperature for process stability. In this study, an evaluation of the WDD process was conducted according to the forming temperature curves (FTCs) characterized from work piece temperatures instead of tool temperatures, as usual. To achieve this goal, a special index material was developed to accurately obtain FTCs from the work piece material under closed and heated tool conditions. The differences of temperature on work piece material are required to define temperatures by curves. The characteristic behavior of these curves was investigated under non-isothermal WDD of AA 5754-O. In the experimentation stage, the process parameters, namely FTC, blank holder force and punch velocity, which assure successful deep drawability, were determined according to the failure-free cups by analyzing wrinkling and tearing conditions and minimum cup height parameters as output parameters. As the next step, optimum conditions were investigated by evaluating the cup volume and springback parameters. As a general conclusion, approximately 330 • C in the flange-die radius region and 100 • C in the cup wall-punch bottom region are the ideal optimum temperatures for the warm deep drawing process.

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Section: Introductionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Development of Forming Temperature Curves for Warm Deep Drawing Process Under Non-isothermal Conditions

et al. 2015

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“…They observed that the deep drawing performance of the magnesium alloy could be considerably enhanced at the appropriate temperature distribution using the local heating and cooling technique and variable blank holder force (BHF) control. Kim et al [7] developed an analytic method for investigating the effects of material, process, and geometric parameters in the warm forming of aluminum alloys under a simple cylindrical deep drawing process. They observed that the developed model offers rapid, useful, and reasonably accurate results for the design of a warm forming process by predicting the deformation mechanism of the material and the relationships between the LDR and the process parameters in isothermal and non-isothermal heating conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on warm deep drawing of HC420LA grade sheet material

Şen

Karaağaç

Kurgan

2016

Int J Adv Manuf Technol

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The use of high-strength sheet material applications in the automotive industry has become widespread due to their high strength/weight ratios. The formability, however, of these high-strength sheet materials is limited at room temperatures (RTs). In this study, the first of its kind to be conducted, experimental research was performed on the formability of HC420LA grade sheet material using the warm deep drawing (WDD) method. Temperature control is the most important parameter in WDD. In this method, a new temperature control system was designed and manufactured to increase the formability of HC420LA grade sheet material. The limiting drawing ratio (LDR) for a 1.2-mm sheet thickness of HC420LA grade sheet material, which is 2.14 at RT, increased to 2.47 after applying this method. For a 1.5-mm sheet thickness of HC420LA, LDR, which is 2.15 at RT, increased to 2.59 after applying this method. Percent increases of the drawing ratios for 1.2 and 1.5 mm thicknesses were 15.42 and 20.45 %, respectively. A maximum reduction of 15 % in thickness was obtained in formed cups. Lastly, the microstructures of the warm cup's punch corner region and wall and bottom regions were investigated under an optical microscope. The results showed whether any changes occurred in the microstructures and mechanical properties.

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“…Furthermore, stainless steel sheets are extensively used for manufacturing various parts in the kitchen, vessels, transformation, etc., because of their high corrosion-resistivity and proper appearance. Warm deep-drawing for aluminum alloy has already been dealt with by many scholars [6][7][8]. Ethiraj and Kumar surveyed the St 304 deep-drawing process through finite element simulation [9] and empirical observation [10].…”

Section: Introductionmentioning

confidence: 99%

Thinning behavior of laminated sheets metal in warm deep-drawing process under various grain sizes

Kadkhodayan

Afshin

2016

MATEC Web Conf.

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Abstract. The purpose of present research is to investigate the thickness distribution on the warm deep-drawing process of laminated sheets consisting of aluminum alloy series 1050, 5052 and stainless steel 304 (SUS), experimentally. Individually for each layer, the influences of blank temperature and grain size on thinning behavior are clearly demonstrated. In order to survey the thinning behavior in laminate sheet behavior during warm deepdrawing process; three blank temperatures namely, 25̊ C, 100̊ C and 160̊ C are examined. Moreover, to obtain different grain sizes, the aluminum sheets are annealed at 350̊ C, 400̊ C and 450̊ C for 1 hour. Results indicate that increasing temperature and grain size lead to maximum thinning in all layers in Al 1050/SUS and Al 5052/SUS specimens increase. In addition, the most susceptible zone to fracture in aluminum sheets (Al 1050 and Al 5052) is punch profile radius region; nevertheless, for stainless steel sheets this zone switch to central zone of formed cup. These can be attributed to the fact that the adhesive layer play a crucial role in thickness distribution of steel 304 layer, therefore the distribution of thickness strain for adhesive layer is also investigated.

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Development of an analytical model for warm deep drawing of aluminum alloys

Cited by 28 publications

References 18 publications

Development of Forming Temperature Curves for Warm Deep Drawing Process Under Non-isothermal Conditions

Development of Forming Temperature Curves for Warm Deep Drawing Process Under Non-isothermal Conditions

Experimental research on warm deep drawing of HC420LA grade sheet material

Thinning behavior of laminated sheets metal in warm deep-drawing process under various grain sizes

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