Experimental and theoretical study of thermal aspects of the hot stamping process

Abdulhay, Bakri; Bourouga, Brahim; Dessain, Christine

doi:10.1016/j.applthermaleng.2010.11.010

Cited by 88 publications

(40 citation statements)

References 7 publications

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“…기존의 열간성형에 대한 연구들은 대부분 판재 로 성형되는 차체부품들을 대상으로 하고 있으며, 이러한 연구들은 대부분 열간성형 공정시 성형 성, (1~3) 열전달 현상, (4,5) 조직의 변화 (6,7) 등에 초점 이 맞추어져 있다. 최근에 튜브형 소재를 사용하 여 성형과 열처리 특성에 대한 연구들이 일부 수 행되고 있다.…”

Section: 서 론unclassified

Study on Fatigue Characteristic of Suspension Part Using Hot Forming

Suh

Park²,

Park³

et al. 2013

Transactions of the Korean Society of Mechanical Engineers A

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서 론자동차용Abstract: Hot forming using boron steel is currently used for manufacturing low-weight automobile body parts, and a high tensile strength of about 1,500 MPa is obtained after hot forming. However, a high fatigue life is a more important factor than high strength when it is used for automobile suspension parts. A tubular torsion beam axle (TTBA) is one of these suspension parts, and this research deals with the fatigue characteristic of TTBA using hot forming. The low cyclic fatigue life of boron steel is investigated according to the cooling method. In addition, a structural and fatigue analysis of TTBA is performed to predict the fatigue life. The stress concentration that occurs in the tubular torsion beam is found, and the longest fatigue life occurs when rapid cooling is utilized in the TTBA fabrication. † Corresponding Author, caekim@knu.ac.kr

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Section: 서 론unclassified

Study on Fatigue Characteristic of Suspension Part Using Hot Forming

Suh

Park²,

Park³

et al. 2013

Transactions of the Korean Society of Mechanical Engineers A

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“…This can be achieved through the development of tailored die quenching. It is possible to establish a control of the cooling process, allowing a better control over the resulting microstructure [14][15][16][17] . This is accomplished by using localized grooves on the forming tool surface, creating a controlled gap between the surfaces of the tool and of the blank, enabling heat extraction coefficient control and a cooling rate below the critical speed required for formation of a fully martensitic structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Necking Behavior and of Gap Size on the Cooling Rate in Hot Stamping

et al. 2016

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In this study, a tailored die quenching experimental method using low closing pressures and an aluminum flat die was developed in order to evaluate the effects of the gap size on the cooling rate in the hot stamping process of a 22MnB5 steel grade. Initially, the necking behavior in hot stamping was investigated by deforming the specimens to different strain levels and subjecting them to quenching in order to assess this effect on the gap profile formed between the die surface and the sample. Next, a controlled gap was promoted in the central region of the aluminum cooler using aluminum spacers (simulating the gap) with different thickness (0.06/0.15/0.40/0.70mm). Then, its effects on the cooling rate and on the hardness after quenching were evaluated. The results showed that the cooling rate is very susceptible to gap size, that the ideal situation occurred when there was no gap, good heat transfer and higher average cooling rates of 120 o C/s were achieved, and that when the gap was wider than 0.20mm the average cooling rates were lower than 20 o C/s, consequently below the critical 22MnB5 steel cooling for quenching, which is 28 o C/s.

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“…And the final shape and dimension of part mainly depends on the hot forming stage. In the hot forming process, the flow stress of material has an apparent dependence on temperatures, In addition, the high strain rate sensitivity of LCP plate flow stress was observed and it reveals that the final properties of hot stamped component will be also impaired by punch speed [8][9][10][11]. So the high-temperature constitutive equation of LCP plate is the indispensable mathematical model for numerical simulation of hot stamping, and it reflects the relationship between the flow stress and strain, strain rate and the temperature.…”

Section: High Temperature Constitutive Equation Of Lcp Platementioning

confidence: 99%

Evaluating formability of LCP plate for sacral fractures with one step inverse forming finite element analysis

Zhang

et al. 2015

BME

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Abstract. The locking compression plate fixation treatment for the unstable sacral fractures is simple and effective, with less trauma and complications. Some locking compression plate parts have been made of high-strength Plate manufactured by hot stamping process since the demand for lightweight biomedical materials. Finite Element (FE) method of One-Step inverse forming based on deformation theory is the tool to evaluate the formability of locking compression plate panel quickly in initial design for reducing costs and development cycle of Plate. But current one-step inverse forming methods are all suitable for cold stamping, not hot-stamping. This paper proposed one-step inverse forming method and workflow for hotstamping of locking compression Plate. And the B pillar of a sacral bone was simulated and its computing result was compared with experimental value. The result shows that the proposed method in this paper can quickly evaluate high temperature formability of high-strength Plate. And the method is proposed to be used in initial design.

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Experimental and theoretical study of thermal aspects of the hot stamping process

Cited by 88 publications

References 7 publications

Study on Fatigue Characteristic of Suspension Part Using Hot Forming

Study on Fatigue Characteristic of Suspension Part Using Hot Forming

Effect of Necking Behavior and of Gap Size on the Cooling Rate in Hot Stamping

Evaluating formability of LCP plate for sacral fractures with one step inverse forming finite element analysis

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