In metal cutting, the cooling effect of coolant from chip side on the tool-chip interface temperature is analysed by a difference method, under the assumption that -the heat transferred by conduction in the direction of motion of chip may be neglected. The tem- perature rise θ at any point on the tool-chip contact plane (heat source) is given by the following expressions :
θ =
θde-An, where,
A= 0.0044 (
θs/φt2) 0.5 (
ht2) 0.57,
n=100
am/
Vft22= (25/
L) (
m/
t)
2The suffix a' is for dry cutting (
h=0), and analysis showed that
θd is equal to the Jeager's solution solved for a semi-infinite body, when
Vf and
t2 are not very small.In the above, symbols are as follows :
h : the value depended upon a cooling power of fluid α /
K, α : heat transfer coefficient,
K : thermal conductivity of chip materials, a : thermal diffusivity of chip,
t2 : thickness of chip,
Vf : chip velocity,
m : contact length of tool and chip,
L : peclet number
Vfm/4
a.
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