Observation of Cutting Mechanism of Cast Iron

概要

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The orthogonal cutting of cast iron was investigated in respect to the formation process of discontinuous chips. Four types of discontinuous chip ; shear type, tear type with a small crack, tear type with a large crack and crack type ware recognized in the micro-photographs of chip formation process taken by a motor-driven 35mm camera with a micro-flash illumination. From enlarged profile of surface irregularity taken by a surface roughness meter under various cutting conditions, the number of cracks and the angle of cracked fracture to the cutting direction were measured. As a result, it is understood that the type of chip produced depends on the cutting speed and the depth of cut, but not the tool rake angle.
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