Forming of Al 5182-O in a Servo Press at Room and Elevated Temperatures

Ju, Long; Suhas, Patil; Dykeman, James; Altan, Taylan

doi:10.1115/1.4030334

Cited by 14 publications

(8 citation statements)

References 11 publications

(16 reference statements)

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“…Their research showed that the formability of aluminum alloy was improved with the increase in forming rate, and the relation between slide speed and PSC indicated an acceleration effect existed on the formability. Similar research has been carried out on Al 5182-O by Ju et al [15]; the results showed that better part quality could be achieved with a higher forming speed, which could be considered as a more efficient process in production. Mori et al [16] performed cold stamping and hot stamping with different stamping speed on ultra-high-strength steel.…”

Section: Introductionsupporting

confidence: 57%

Effects of Servo Tensile Test Parameters on Mechanical Properties of Medium-Mn Steel

Chi

Han

2019

Materials

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As a new type of third-generation automotive steel with high strength and plasticity, medium-Mn steel (MMnS) has been widely used in automotive industries for its excellent properties. In recent years, servo stamping technology for high-strength metal forming is a hot topic due to its good performance in forming under complex processing conditions, and servo parameters determine the forming quality. In this paper, experiments considering tensile speed and position where speed changes (PSC) were carried out on MMnS to investigate the influences of tensile parameters on mechanical properties including strength and total elongation (TE). The results show that PSC does not significantly impact total elongation. Initial tensile speed (ITS) and final tensile speed (FTS) significantly impact the total elongation. The interaction between all tensile parameters can impact total elongation. Two artificial neural networks, back propagation neural network (BPNN) and radial basis function neural network (RBFNN), were used to establish analytical models. The results of supplemental experiment and residual analysis were conducted to verify the accuracy of the analytical models. The BPNN has a better performance and the analytical model shows that with the increase of PSC, it has a slight impact on the changes of optimal and minimum total elongation, but the combinations of tensile parameters to obtain total elongations higher than 40% change significantly.

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Section: Introductionsupporting

confidence: 57%

Effects of Servo Tensile Test Parameters on Mechanical Properties of Medium-Mn Steel

Chi

Han

2019

Materials

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“…Laurent et al 22 reported that formability improves above die temperatures of 150°C for Al5754. Some of the recently published works also deal with the warm forming research on aluminum alloys [23][24][25][26][27][28] and steels [29][30][31][32][33] with a focus on specific applications. It seems from the literatures that the technology of warm forming is limited to laboratory research only.…”

Section: Introductionmentioning

confidence: 99%

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Saxena

Drotleff

Mukhopadhyay

2016

The Journal of Strain Analysis for Engineering Design

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The press formability of the automotive materials such as aluminum alloys, magnesium alloys and steels is influenced by forming temperatures. While adjusting the temperature level of die, punch and binder, the lightweight materials can successfully be formed, especially for complex automotive body parts. The objective of this case study is to determine the forming limit curves of Al6014 and DP600 alloy sheet at elevated temperatures in specific range of 200°C and 250°C suitable for press operation in long-run production cycles. The focus is set on Al6014 and DP600 as these two materials are widely used in automotive panels due to their high strength and lightweight and improved resistance to corrosion. DP600 is sometimes preheated before forming to avoid cracks. Thus, it is essential to study the effect of preheating temperature on the formability. Experiments were conducted at forming temperatures of 200°C and 250°C and at low punch speed. The measurement of train distribution was carried out online using digital image correlation with the optical deformation measurement system GOM Aramis. Both Al6014 and DP600 alloys were found to have good drawability and stretchability. It was found that for Al6014, the forming limit curve level increases with temperature. On the contrary, DP600 showed slight decrease in the level of forming limit curve as temperature was increased. Warm formability for these alloys was further characterized through part depth and percentage thinning measurements.

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“…So, the properties of low-carbon steel were used from literature; (b) the heat transfer coefficient which determines the amount of the heat transferred from sheet to the dies was considered as a constant value. However, as determined experimentally, this value is a function of the gap and pressure between the sheet and the die [9,11]; (c) the sheet and the tools are simulated as surface elements and thermal integration points through the thickness were considered to analyze the heat conduction inside the tools; (d) a constant value of the COF is considered in all simulations and it is known that the COF is not constant in all locations in the die during stamping. Figure 3 shows the predicted maximum temperature generated at the die/sheet interface compared to the experimental results.…”

Section: Tools Sheetmentioning

confidence: 99%

“…Therefore, it is important to accurately determine the fraction of deformation work which goes to increasing the temperature of the material during the sheet forming process. There are a few studies that investigated the temperature generation in forming of AHSS and aluminum alloys using numerical or experimental procedures [3,4,8,9]. Kim et al [3], investigated the shear fracture at die corner radius in draw bending test of DP980 and they concluded that the deformation-induced heating, in the order of 75 C, has a dominant effect on the occurrence of shear failure [8].…”

Section: Introductionmentioning

confidence: 99%

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Temperature Increase in Forming of Advanced High-Strength Steels Effect of Ram Speed Using a Servodrive Press

Fallahiarezoodar

Peker

Altan

2016

Journal of Manufacturing Science and Engineering

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In forming of advanced high-strength steel (AHSS), the temperature increase at die/sheet interface affects the performance of lubricants and die wear. This study demonstrates that finite-element (FE) analysis, using commercially available software, can be used to estimate temperature increase in single as well as in multiple stroke operations. To obtain a reliable numerical process design, the knowledge of the thermal and mechanical properties of the sheet as well as the tools is essential. Using U-channel drawing the thermomechanical FE model has been validated by comparing predictions with experimental results. The effect of ram speed and stroking rate (stroke per minute (SPM)) upon temperature increase in real productionlike operation have been investigated. Deep drawing of CP800 and DP590 sheets in a servodrive press, using an industrial scale die, has been studied. Thinning distribution and temperatures in the drawn part have been investigated in single and multiple forming operations. It is found that temperatures may reach several 100 deg and affect the coefficient of friction (COF). The values of COF under productionlike conditions were compared to that obtained from laboratory experiments. This study illustrates that in forming AHSS, (a) the temperature increase at the die/sheet interface is relatively high and should be considered in process design stage, and (b) the lubricant performance is significantly affected by the ram speed and sheet/die interface temperature during deformation.

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Forming of Al 5182-O in a Servo Press at Room and Elevated Temperatures

Cited by 14 publications

References 11 publications

Effects of Servo Tensile Test Parameters on Mechanical Properties of Medium-Mn Steel

Effects of Servo Tensile Test Parameters on Mechanical Properties of Medium-Mn Steel

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Temperature Increase in Forming of Advanced High-Strength Steels Effect of Ram Speed Using a Servodrive Press

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