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In order to obtain basic information on the improving the surface integrity of machined surfaces, the relationship between the residual stress of cut surfaces and the cutting edge shapes of cutting tools was examined. We used cutting tools that had various nose radiuses and cutting edge roundnesses to perform dry facing on a lathe. The residual stresses of the cut surfaces were measured by X-ray diffraction method. We found that when the rake angle was about zero degrees, the nose radius barely affected the residual stresses of the cut surfaces. However, when the negative rake angle was large, the nose radius significantly affected the residual stress. The residual stresses of the cut surfaces shifted compressive side when there was an increase in cutting edge roundness. The residual stress of a cut surface is kept in a high compressive state even though the cutting force decreases greatly due to grinding removing the rake side part of the cutting edge roundness.

Influence of Cutting Edge Shape on Residual Stresses of Cut Surfaces (2nd Report, Effects of Nose Radius and Cutting Edge Roundness)