Calibrated thermal microscopy of the tool-chp interface in machining
Matthew A. Davies, Howard W. Yoon, Tony L. Schmitz, Timothy J. Burns, Michael Kennedy
This paper presents the results of calibrated, microscopic measurement of the temperature fields at the tool-chip interface during the steady-state, orthogonal machining of AISI 1045 steel. The measurement system consists of a nearly diffraction limited infrared imaging microscope with a 0.5 mm square target area, and a spatial resolution of less than 5 mm. The system is based on a commercial InSb 128 x 128 focal plane array with an all-reflective microscope objective and a frame acquisition time of less than 1 ms. The microscope is calibrated using a standard blackbody source from the radiance temperature calibration laboratory at the National Institute of Standards and Technology. The emissivity of the machined material is determined from the infrared reflectivity measurements. Thermal images of steady state machining are measured on a diamond-turning class lathe for a range of machining parameters. The measurements are validated by two methods: (1) energy flux calculations made directly from the thermal images using a control-volume approach; and (2) a simplified finite-difference simulation. The standard uncertainty of the temperature measurements is estimated to be about 40?C at 700?C.
, Yoon, H.
, Schmitz, T.
, Burns, T.
and Kennedy, M.
Calibrated thermal microscopy of the tool-chp interface in machining, Machining Science and Technology
(Accessed February 24, 2024)