アルミニウム合金ＡＣ３Ａの研削残留応力について

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Al-Si alloy castings AC3A were wet ground with a SiC type grinder at different work speeds and different depths of cut using various grinding fluids. Effects of grinding conditions and plastic deformation on the residual stress were examined. The plastic atrain in ground layers was measured by the moire method. The maximum residual stress is intensified and the depth of tensile stressed part is increased as the depth of cut increases and the work speed accerelates. The moire strain in the normal direction at 1mm in depth from the surface has a closed correlation with the maximum residual stress. The residual stress and plastic strain in the ground layer are moderated by using oil type grinding fluids rather than water soluble type fluids.