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Your search keyword '"Rolfe, Bernard F."' showing total 107 results
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107 results on '"Rolfe, Bernard F."'

29. The surface temperature prediction on steel-tool steel sliding pairs

Author

[Unknown], Okonkwo, Paul C., Kelly, Georgina, Khan, Mohd Shariq, Pereira, Michael P., Rolfe, Bernard F., Islam, Md Saiful, [Unknown], Okonkwo, Paul C., Kelly, Georgina, Khan, Mohd Shariq, Pereira, Michael P., Rolfe, Bernard F., and Islam, Md Saiful

Published
2019

37. Temperature conditions during 'cold' sheet metal stamping

Author

Pereira, Michael P, Rolfe, Bernard F, Pereira, Michael P, and Rolfe, Bernard F

Abstract

This paper investigates the friction and deformation-induced heating that occurs during the stamping of high strength sheet steels, under room temperature conditions. A thermo-mechanical finite element model of a typical plane strain stamping process was developed to understand the temperature conditions experienced within the die and blank material; and this was validated against experimental measurements. A high level of correlation was achieved between the finite element model and experimental data for a range of operating conditions and parameters. The model showed that the heat generated during realistic production conditions can result in high temperatures of up to 108 °C and 181 °C in the blank and die materials, respectively, for what was traditionally expected to be 'cold' forming conditions. It was identified that frictional heating was primarily responsible for the peak temperatures at the die surface, whilst the peak blank temperatures were caused by a combination of frictional and deformation induced heating. The results provide new insights into the local conditions within the blank and die, and are of direct relevance to sheet formability and tool wear performance during industrial stamping processes. © 2014 Elsevier B.V. All rights reserved.

Published
2014

42. Effects of temperature in relation to sheet metal stamping

Author

Mastorakis, Nikos, Mladenov, Valeri, Lepadatescu, Badea, Karimi, Hamid Reza, Helmis, Costas G., Okonkwo, Paul C., Pereira, Michael P., Kelly, Georgina, Rolfe, Bernard F., Mastorakis, Nikos, Mladenov, Valeri, Lepadatescu, Badea, Karimi, Hamid Reza, Helmis, Costas G., Okonkwo, Paul C., Pereira, Michael P., Kelly, Georgina, and Rolfe, Bernard F.

Abstract

The demand to reduce the use of lubricants and increase tool life in sheet metal stamping has resulted in increased research on the sliding contact between the tool and the sheet materials. Unlubricated sliding wear tests for soft carbon steel sliding on D2 tool steel were performed using a pin-on-disk tribometer. The results revealed that temperature has an influencing role in the wear of tool steel and that material transfer between tool and sheet can be minimized at a certain temperature range in sheet metal stamping.

Published
2011

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