66
Q. Liu et al.
Fig. 6.8 Meshing model of
the workpiece and tool
The workpiece model mesh is set to 20,000, hexahedron element shape, the tool
model mesh size is 0.015 and the unit shape is set to tetrahedron in grid control
attributes. At the same time, the gridding of milling layer area and cutter is refined.
The mesh size of the refined part is 0.005. The mesh model of the workpiece and
cutter is shown in Fig. 6.8.
6.2.3 Attribute Definition of Cutting Simulation Model
Tool Material Properties: the density is 1.47e
−8 kg/m
3 , the conductivity is
75.3 W/m/C, the specific heat is 220000000 J/kg/C, the elastic modulus is
583000 MPa, the Poisson’s ratio is 0.33, the inelastic share is 0.8, and the thermal
expansion is 5.4e
−6 /°C.
Material Attributes of the Workpiece.
Finite Element Model of Temperature Field. As an adiabatic process, because the heat
generated during cutting cannot be timely dissipated, the heat conduction equation
can be expressed as Eq. (6.4):
λ
∂
2 T
∂ x 2 +
∂
2 T
∂ y 2 +
∂
2 T
∂z 2
+ ˙
q = ρC ˙
T
(6.4)