抄録
It is well known that the curved and splitted 2θ vs. sin2ψ distributions are often observed in the surface layers of the uni-directionally machined metallic materials in the case of the X-ray stress measurement. In order to solve this problem, a new X-ray method which provides more informations was proposed previously by Dölle and Hauk.
The present experiments were carried out to determine the influence of cutting speed on the residual strain state, half value width of X-ray diffraction lines, micro-vickers hardness and surface roughness in the cut layer of carbon steel S50C.
The experimental results showed that the changes in residual strain tensor components ε11, ε22 had similar tendency to those in half value width, micro-vickers hardness and centerline average height roughness in the machining direction.
It was also clarified that with an increase in cutting speed, i.e. with a decrease in cutting volume, the residual strain tensor components ε11 and ε22 increased. In some cases, however, the strain increased discontinuously, which was explained by the formation of built-up edge.
These results show that the present method of measuring strain tensor is one of the powerful methods to investigate the machining mechanism and surface layer state.
