The thickness of the metal oxide layer formed on the ground surface is related to the oxidation rate law of the workpiece and the surface temperature in the grinding process. In the present research, the influences of the thermal characteristics of the workpiece and the grinding conditions on the surface temperature of the growing layer after get out of contact with the grinding wheel are studied. The results are as follows.
(1) Theoretical temperature distributions which are calculated by assuming a linear heat source strength with a maximum at the front of the contact zone and zero at the rear, agree with the experimental results.
(2) The relation between the exit, temperature θ
r at the rear end of the contact zone and the maximum temperature θ
m is given by θ
r=0.693θ
m, and the subsequent surface temperature θ
a is expressed as θ
a=θ
r(ντ/ι)
-α, where ι, ν and τ are the semilength of the heat source, the table speed and the lapse of time, respectively.
(3) The value of the cooling coefficient a is about 0.454 and it is almost independent on the thermal characteristics of the workpiece and the grinding conditions.
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