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The theoretical analysis of heat flow in conjunction with cutting data in high-speed orthogonal metal-machining operations reveals that, for a given tool rake, the temperature distribution along the shear plane is solely dependent on the thermal number, Vct/k. An explanation is offered for the difference in chip curvature as the cutting conditions are changed. Further significance of the thermal number in metal machining is presented.
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Chao et al. (1953) studied this question.
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