The residual stress caused by machining directly related to machining deformation and machining
damage. Being limited to measuring technique of machining residual stress and characteristics of composite, there are
seldom paper about machining residual stress on composites. In this paper, hole-drilling method that is suitable for
measuring the machining residual stress of composites has been adopted. C/ C composites are machined by means of
milling-grinding. The cutting tool is grinding head that is electroplating emery on, by means of quadratic general rotary
unitized design. Four factors including cutting speed, cutting width, cutting depth and feed are selected for this experiment.
The regression mathematical model based on quadratic polynomial is obtained through the analysis of experimental
results. The variation of machining residual stress along with the change of processing parameters is analyzed.
The extreme value is obtained by searching optimization. It shows that machining residual stress is all compressive
stress. Along with the increase of the cutting speed, residual stress tends to an asymptotic values that is -16MPa in
this experiment. Along with the increase of the cutting width, cutting depth and feed, residual stress first increased
and then decreased. The demarcation of parameters are cutting width: aw =6 mm; cutting depth: ap =0． 5 mm; feed:
f =200 mm/ min.