An Experimental Study of Heat Transfer in Metal-Forming Processes

Lenard, John; Davies, Mallory

doi:10.1016/s0007-8506(07)61210-4

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…A popular solution is the application of a chamber furnace, or a few furnaces placed next to each other in one row together with the quenching tanks and washers. The whole is operated by an industrial In the implementation of a thermal treatment process, the key device is the furnace in which the process takes place [25][26][27], and as well as conditions of heat exchange [28][29][30][31][32][33]. In this aspect, we distinguish between chamber, tunnel, pusher, and belt furnaces, as well as others, with special constructions and applications [34][35][36][37].…”

Section: Subject Mattermentioning

confidence: 99%

Application of a Prototype Thermoplastic Treatment Line in Order to Design a Thermal Treatment Process of Forgings with the Use of the Heat from the Forging Process

et al. 2020

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The global production of die forgings is an important branch of the motor industry for obvious reasons, resulting from the very good mechanical properties of the forged products. The expectations of the recipients, beside the implementation of the forging process, include also a range of supplementary procedures, such as finishing treatment including shot blasting, thermal treatment, and machining, in order to ensure the proper quality of the provided semi-product or the ready detail for the assembly line. Especially important in the aspect of the operational properties of the products is the thermal treatment of the forgings, which can be implemented in many variants, depending on the expected results. Unfortunately, a treatment of this type, realized separately after the forging process, is very time and energy-consuming; additionally, it significantly raises the production costs due to the increased energy consumption resulting from the necessity of repeated heating of the forgings for such thermal treatment. The article reviews the most frequently applied (separately, after the forging process) thermal treatments for die forgings together with the devices/lines assigned for them, as well as presents an alternative (thermoplastic) method of forging production with the use of the forging heat. The paper also presents a prototype semi-industrial controlled cooling line developed by the authors, which allows the development of the assumed heat treatment of forgings directly after forging with the use of forging heat, together with sample results of conducted tests.

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Section: Subject Mattermentioning

confidence: 99%

Application of a Prototype Thermoplastic Treatment Line in Order to Design a Thermal Treatment Process of Forgings with the Use of the Heat from the Forging Process

et al. 2020

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“…However, the problem of heat generation and transfer is still unsolved because of insufficient or unreliable heat transfer coefficients. According to Lenard and Davies [5], coefficients depend on mechanical events, thermal balance and boundary conditions. Under stationary production conditions the temperature field is rather stable, its impact on the process can be controlled.…”

Section: Thermo-elastic Response Of the Systemmentioning

confidence: 99%

Comments on the cold metal forming processes stability control

Kuzman

2007

Journal of Materials Processing Technology

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“…The temperature evolutions of the punch were measured and recorded using thermocouples embedded into the punch at a distance of 0.5 mm from the contact interface. Malinowski et al [15] and Lenard and Davies [16] measured the heat transfer between a pre-heated die and another die connected to water-cooled heat exchangers using a hydraulic press to obtain the IHTC value of the die material.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Interfacial Heat Transfer Coefficient in the Hot Stamping of AA7075

Liu

Fakir

et al. 2016

Manufacturing Rev.

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-The interfacial heat transfer coefficient (IHTC) is a key parameter in hot stamping processes, in which a hot blank is formed and quenched by cold dies simultaneously. The IHTC should therefore be identified and used in FE simulations to improve the accuracy of simulation results of hot stamping processes. In this work, a hot stamping simulator was designed and assembled in a Gleeble 3800 thermo-mechanical testing system and a FE model was built in PAM-STAMP to determine the IHTC values between a hot aluminium alloy 7075 blank and cold dies. The IHTC values were determined at different contact pressures under both dry and lubricated (Omega-35) conditions. In addition, a model to calculate the IHTC value at different contact pressures and area densities of lubricant was developed for the hot stamping process, which was proved to be working well with verification tests.

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An Experimental Study of Heat Transfer in Metal-Forming Processes

Cited by 13 publications

References 8 publications

Application of a Prototype Thermoplastic Treatment Line in Order to Design a Thermal Treatment Process of Forgings with the Use of the Heat from the Forging Process

Application of a Prototype Thermoplastic Treatment Line in Order to Design a Thermal Treatment Process of Forgings with the Use of the Heat from the Forging Process

Comments on the cold metal forming processes stability control

Determination of the Interfacial Heat Transfer Coefficient in the Hot Stamping of AA7075

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