This study presents an inverse heat transfer method to estimate the time history of a local
heat flow into the work-piece during milling of AISIH13 with considering a 3D thermal
model. Temperatures are measured using thermocouples within the work-piece providing
input data for the inverse solver. The conjugate gradient method is used as an inverse
solver to predict the local time dependent heat flow distribution on the cutting surfaces
as well as the temperature distribution in the work-piece. A moving point heat source and
a moving plane heat source with different heat source velocity is considered to investigate
their influence on the estimated heat flow. Results indicate a good agreement between the
experimental and estimated data with an average root mean square error less than 0.2◦C. It
can be observed that the heat flow distribution is a function of heat source geometry, cutting
speed and feed rate, but the temperature distribution is a weak function of geometry of the
moving heat source. Changes of temperature with depth are studied. This study suggests
that the developed inverse model can be successfully applied for estimating the heat flow
and thermal field in the work-piece during milling.
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