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Open AccessArticle

Partition of Primary Shear Plane Heat in Orthogonal Metal Cutting

1
MAPEX Center for Materials and Processes, Faculty of Production Engineering, University of Bremen, Badgasteiner Straße 1, 28359 Bremen, Germany
2
Leibniz Institute for Materials Engineering IWT, Badgasteiner Straße 3, 28359 Bremen, Germany
*
Author to whom correspondence should be addressed.
J. Manuf. Mater. Process. 2020, 4(3), 82; https://doi.org/10.3390/jmmp4030082
Received: 6 July 2020 / Revised: 8 August 2020 / Accepted: 12 August 2020 / Published: 13 August 2020
(This article belongs to the Special Issue Advances in Modelling of Machining Operations)
When assessing the effect of metal cutting processes on the resulting surface layer, the heat generated in the chip formation zone that is transferred into the workpiece is of major concern. Models have been developed to estimate temperature distributions in machining processes. However, most of them need information on the heat partition as input for the calculations. Based on analytical and numerical models, it is possible to determine the fraction of shear plane heat transferred into the workpiece for orthogonal cutting conditions. In the present work, these models were utilized to gain information on the significant influencing factors on heat partition, based on orthogonal cutting experiments, experimental results from the literature, and a purely model-based approach. It could be shown that the heat partition does not solely depend on the cutting velocity, the uncut chip thickness, and the thermal diffusivity—combined in the dimensionless thermal number—but the shear angle also has to be taken into account, as already proposed by some researchers. Furthermore, developed numerical models show that a more realistic representation of the process kinematics, e.g., regarding chip flow and temperature-dependent material properties, do not have a relevant impact on the heat partition. Nevertheless, the models still assume an idealized orthogonal cutting process and comparison to experimental-based findings on heat partition indicates a significant influence of the cutting edge radius and the friction on the flank face of the tool. View Full-Text
Keywords: heat partition; orthogonal cutting; thermal modeling; cutting temperature heat partition; orthogonal cutting; thermal modeling; cutting temperature
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Langenhorst, L.; Sölter, J.; Kuschel, S. Partition of Primary Shear Plane Heat in Orthogonal Metal Cutting. J. Manuf. Mater. Process. 2020, 4, 82.

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