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This work investigates the milling of the surface of glass and carbon fiber-reinforced plastics
using tools with a polycrystalline diamond insert. The milling process was conducted under three
different conditions, namely without the use of a cooling liquid, with oil mist cooling, and with
emulsion cooling. The milling process of composites was conducted with variable technological
parameters. The variable milling parameters were feed per tooth and cutting speed. The novelty of
this work is the use of recurrence methods based on the cutting force signal to analyze the milling of
composites with three types of cooling. The primary aim of the study was to determine the effect of
variable technological milling parameters on cutting force and to select recurrence quantifications that
would be sensitive to the cooling method. It has been shown that recurrence quantifications such as
determinism (DET), laminarity (LAM), averaged diagonal length (L), trapping time (TT), recurrence
time of the second type (T2), and entropy (ENTR) are sensitive to the cooling methods applied for the
tested composite materials. The results have shown that it is possible to determine common ranges
of changes in sensitive recurrence quantifications for the two tested variables parameters of milling:
0.63–0.94 (DET), 0.69–0.97 (LAM), 7.30–13.48 (L), 2.92–4.98 (TT), 17.01–38.25 (T2), 2.02–3.16 (ENTR).
The ANOVA analysis results have confirmed that the studied variables have a significant impact on
the recurrence quantifications.
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