The transient aspects of chip formation during the entry of tool into the workpiece and its exit is receiving greater attention of late in the light of the need for correct evaluation of the cutting capabilities of tools during intermittent cutting. The data will also have relevance in understanding the tool performance in operations like milling. The present article is devoted to the specific aspect of transient stresses in the cutting tool-tip during its entry into the work material under different conditions of cutting such as speed, thickness of cut, rake angle and entry mode. From the instantanious force and contact length data, using the single concentrated load approximation the injurious free rake tensile stress transient was studied. This indicates a specific stress peak having its own time history depending upon the cutting conditions used. Useful conclusions on the strength aspects of cutting tools under transient loading conditions have been drawn.

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