Hot sheet metal forming: The formulation of graded component characteristics based on strategic temperature management for tool-based and incremental forming operations

Neugebauer, Reimund; Schieck, Frank; Rautenstrauch, Anja; Bach, Maarten

doi:10.1016/j.cirpj.2011.06.010

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…The forming technique has developed for subjecting metals with limited formability, such as boron steel [9,10]. Specifically, processing by hot stamping provides high strength by inducing the martensitic transformation of the steel by quenching within the die [9][10][11]. For an Al 7075 alloy, the hot-stamped parts are rapidly quenched to obtain W-temper, and then requires artificial aging cycles of T6 or T7 in order to achieve high strength [8].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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Abstract:The present study investigates the significance of pre-strain on the T6 aging behavior of an Al 7075 alloy for evaluating the applicability of hot stamping. In practice, the alloy was pre-strained up to 15% during solution heat treatment at 480 • C prior to quenching, and artificial aging was conducted at 120 • C. The peak aging time and precipitation behavior were compared with the alloy with pre-straining at room temperature after quenching but immediately before the artificial aging. The results showed that increasing amounts of pre-strain tend to reduce the aging time up to 50% for achieving peak hardness, which is consistent with the alloy at the T6 condition. There is a limitation for the maximum attainable amount of pre-strain of 10% for the homogeneous distribution of strain when the alloy is strained at room temperature (RT) due to the low formability. The pre-strained alloy as hot stamping exhibited lowering of the peak reaction temperatures for dissolution and formation of Guinier-Preston (GP)-Zones and precipitated with increasing amounts of pre-strain towards 15% through the differential scanning calorimetry analysis, thereby confirming the shortening of the peak aging time. The present study confirms the excellent potential of the hot-stamping process to extend the capability of an Al 7075 alloy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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“…FC is done with an open chamber with 0.5 °C/s of cooling rate. The graph matched with the continuous cooling deformation diagram of 22MnB5 material 24 is shown in Figure 2.…”

Section: Experimental Conditions and Equipmentmentioning

confidence: 68%

Prediction of springback during indirect hot press forming through tensile test with simultaneous cooling

Hwang

Moon

Kang

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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Due to the demand for reduced weight, improved safety, and crashworthiness in vehicles, the need to manufacture automobile structural components from ultrahigh-strength steels is apparent. Indirect hot press forming process is a process developed from hot press forming because of steel's high resistance to trimming after hot press forming. From the researches about indirect hot press forming, considerable springback in the indirect hot press forming is accrued after preforming. After this trimming, the material is calibrated by hot press forming process. In this article, the springback is accrued at preforming and the final shape of u-bending with varying cooling rates is predicted using ABAQUS software. To find the characteristics and effects of temperature changes during the hot press forming process, high-temperature tensile test with simultaneous cooling is conducted and the results are applied to the analysis. The shape deviations after the indirect hot press forming process are compared according to cooling rate conditions.

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“…The improvement of heating methods for quenchable steel 22MnB5 leads to the manufacturing of tailored products that have different mechanical properties in a single part. In the same way, [4] introduced the processing of a tailored formed part by applying resistance heating, whereas [5] presented a new technology summarized by controlling the heating and cooling of the sheet simultaneously in the forming tool. Later, a local resistance heating process was applied by [6] to perform a tailored structure.…”

Section: Introductionmentioning

confidence: 99%

Implementing Thermomechanical Properties of 22MnB5 Steel during Hot Single-Point Incremental Forming

Al-Obaidi

Kräusel

Landgrebe

2017

MSF

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The strategy in manufacturing hardened parts used in car bodies is to tailor the mechanical properties. This is done by combining together a high-strength region and a high-toughness region to ensure the crash performance required. Other successive secondary operations such as trimming, joining and welding can be improved as a result of the tailoring process. In this work, the mechanical properties of 22MnB5 alloy sheet material produced by single-point incremental forming have been tailored. For this purpose, the sheets were locally heated by induction during the forming process and subsequently cooled. The sheet temperature was controlled by the CNC milling machine feed rate and induction power. As a result, the produced tailored parts consist of three different regions: ductile, transition and hardened regions. The Vickers hardness values were 583 HV1 and 175 HV1 for the hardened and ductile regions, respectively. The proposed application allows forming and quenching at the same time without transfer and to reduce the process time.

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Hot sheet metal forming: The formulation of graded component characteristics based on strategic temperature management for tool-based and incremental forming operations

Cited by 13 publications

References 6 publications

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Prediction of springback during indirect hot press forming through tensile test with simultaneous cooling

Implementing Thermomechanical Properties of 22MnB5 Steel during Hot Single-Point Incremental Forming

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