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Mr. CHENPENG TONG
Imperial College London

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0 Hot Stamping
0 Steel
0 Metal Forming Processes And Its Simulation
0 formability
0 Medium-Mn steel

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Review
Published: 08 December 2020 in Metals
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Improvement of the hot stamping process is important for reducing processing costs and improving the productivity and tensile properties of final components. One major approach to this has been to conduct all or part of the process at lower temperatures. The present paper reviews the state of the art of hot stamping techniques and their applications, considering the following aspects: (1) conventional hot stamping and its advanced developments; (2) warm stamping approaches in which complete austenitisation is not attained during heating; (3) hot stamping with a lower forming temperature, i.e., low-temperature hot stamping (LTHS); (4) advanced medium-Mn steels with lower austenitisation temperatures and their applicability in LTHS. Prospects for the further development of LTHS technology and the work required to achieve this are discussed.

ACS Style

Chenpeng Tong; Qi Rong; Victoria A. Yardley; Xuetao Li; Jiaming Luo; Guosen Zhu; Zhusheng Shi. New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review. Metals 2020, 10, 1652 .

AMA Style

Chenpeng Tong, Qi Rong, Victoria A. Yardley, Xuetao Li, Jiaming Luo, Guosen Zhu, Zhusheng Shi. New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review. Metals. 2020; 10 (12):1652.

Chicago/Turabian Style

Chenpeng Tong; Qi Rong; Victoria A. Yardley; Xuetao Li; Jiaming Luo; Guosen Zhu; Zhusheng Shi. 2020. "New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review." Metals 10, no. 12: 1652.

Original article
Published: 04 November 2020 in The International Journal of Advanced Manufacturing Technology
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The cooling system is a critical element in tooling for hot stamping high-strength aluminium alloys, for which very high quenching rates are required to ensure a supersaturated solid solution state in formed parts. To enhance cooling, ducts within the tools should be close and conformal to the surface die profile. Currently, ducts with curved profiles are made by drilling short straight lengths in die segments which are clamped together to form a complete die, which is expensive and hard to achieve the shape of duct with best cooling performance. To address these disadvantages, a novel method which enables efficient manufacture of conformal cooling systems by embedding a network of tubular cooling ducts within a cast matrix is presented in this paper. The feasibility of the proposed method of making ducts in the hot stamping die is demonstrated. Both experimental and computer-based die quenching tests using heated aluminium test pieces were undertaken to determine the cooling performance of a laboratory-scale tool set with cooling ducts. Simulations using the validated FE model were performed to investigate the effects of cross-sectional geometry, material and duct layout, on the quenching performance of the tools. It was found that ducts made of mild steel perform sufficiently well to make the use of high conductivity copper unnecessary. For a flat die surface, square section ducts provided highest cooling rates in comparison with circular and diagonal ones. The uniformity of die temperature increases with the decreased distance between neighbouring ducts, which indicates that a minimal gap is recommended without deteriorating tool strength. The developed tooling technology has the potential to provide a low-cost, highly efficient method of making conformal cooling ducts because the hot stamping die of high-strength aluminium alloy panels requires larger dimension, greater complexity and higher quenching rates.

ACS Style

Kailun Zheng; Chenpeng Tong; Yong Li; Jianguo Lin; Zoltan Ciaba Kolozsvari; Trevor A. Dean. An experimental and numerical study of feasibility of a novel technology to manufacture hot stamping dies with pre-constructed tube network. The International Journal of Advanced Manufacturing Technology 2020, 111, 2919 -2937.

AMA Style

Kailun Zheng, Chenpeng Tong, Yong Li, Jianguo Lin, Zoltan Ciaba Kolozsvari, Trevor A. Dean. An experimental and numerical study of feasibility of a novel technology to manufacture hot stamping dies with pre-constructed tube network. The International Journal of Advanced Manufacturing Technology. 2020; 111 (9):2919-2937.

Chicago/Turabian Style

Kailun Zheng; Chenpeng Tong; Yong Li; Jianguo Lin; Zoltan Ciaba Kolozsvari; Trevor A. Dean. 2020. "An experimental and numerical study of feasibility of a novel technology to manufacture hot stamping dies with pre-constructed tube network." The International Journal of Advanced Manufacturing Technology 111, no. 9: 2919-2937.

Journal article
Published: 04 September 2020 in Procedia Manufacturing
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Creep age forming (CAF) of an Al-Cu-Li alloy (AA2050-T34) considering its anisotropic creep-ageing behaviour has been experimentally and numerically investigated in this study. A series of uniaxial creep-ageing tests of AA2050-T34 has been carried out in both tension and compression conditions. The creep-ageing results in longitudinal and transverse samples show some anisotropic behaviour in both the room temperature yield strength and the creep strain, in which more strengthening occurs at the intermediate stage and less creep strain is produced in the transverse samples than the longitudinal samples under the same loading condition. It is also found that compressive loading results in much higher anisotropic behaviour than tensile loading. A material model has been adopted for the creep-ageing of AA2050 and shows a good fit to experimental data. Based on the model, a four-point bending virtual test has been developed in PAM-STAMP for simulating the CAF process of AA2050. The results indicate that the anisotropic behaviour contributes an apparent effect on both creep-aged properties and springback of the CAF process and need be considered for CAF manufacture of AA2050 components.

ACS Style

Chenpeng Tong; Yong Li; Zhusheng Shi. Investigation of anisotropic creep-ageing behaviour of Al-Cu-Li alloy AA2050. Procedia Manufacturing 2020, 50, 241 -247.

AMA Style

Chenpeng Tong, Yong Li, Zhusheng Shi. Investigation of anisotropic creep-ageing behaviour of Al-Cu-Li alloy AA2050. Procedia Manufacturing. 2020; 50 ():241-247.

Chicago/Turabian Style

Chenpeng Tong; Yong Li; Zhusheng Shi. 2020. "Investigation of anisotropic creep-ageing behaviour of Al-Cu-Li alloy AA2050." Procedia Manufacturing 50, no. : 241-247.