An inverse estimation scheme to measure steady-state tool-chip interface temperatures using an infrared camera

A new technique is developed to estimate the average steady-state chip-tool interface temperature during turning. An infrared (IR) video camera attach ed on the carriage of the lathe measures the transient cooling behavior on the rake surface of an insert after the feed motion is halted. This allows the zero heat flux boundary condition, where the transient Laplace heat con duction problem can be solved numerically to obtain the temporal and spatia l temperature distribution. With the experimentally determined transient te mperature distribution, the one-dimensional ellipsoidal model is used to es timate the average steady-state chip-tool interface temperature during mach ining. The results on turning gray cast iron (GCI) and AISI 1045 steels wit h various coated and uncoated K313 carbide inserts are presented. (C) 2001 Elsevier Science Ltd. All rights reserved.