Shigeru Yonetani

Residual stress in dry-ground Al-Si alloy castings.

Al-Si alloy castings, AC3A, were dry ground at different depth of cut, work speed and wheel speed. Both the residual stress and residual shearing stress in the specimens were measured. Normal residual stress generated in the grinding direction was tension at the surface of the specimens. Tensile residual stress at the surface was small. The residual shearing stress at the surface decreased with the increase in the depth of cut and work speed. Textures at the grinding surface and slightly inner regions of the specimens were investigated. Textures at the grinding surface were similar to each other for all grinding conditions, while textures at the slightly inner region were different from those at the surface. The influence of the alloy structure on the residual stress was discussed.