Milling Tool Wear State Recognition by Vibration Signal Using a Stacked Generalization Ensemble Model

Table 2

The main properties of the 45 steel.

Material properties	Value
Size (mm × mm × mm)	100 × 100 × 80
Density (g/cm^3)	7.85
Elastic modulus (GPa)	210
Poisson ratio	0.269
Chemical composition	C 0.46, Si 0.23, and Mn 0.59