6533b7ddfe1ef96bd1273c94

RESEARCH PRODUCT

THE INFLUENCE OF TOOL STIFFNESS OF THE LIFETIME OF THE INSERTS IN INTERRUPTED CUTTING OPERATIONS

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ABSTRACT In the present paper the influence exerted by the stiffness of the tool-workpiece system under working conditions on tool life up to the fracture of carbide inserts in interrupted cutting is investigated. It is shown how, with the increase in compliance of the system, there is a corresponding increase in the average tool life of the insert which is greater the lesser the cutting speed. The results of tests carried out indicate as a possible cause the amount of damage evident in the successive phase of tool engagement with the workpiece. It was observed how, in this phase, the tool, vibrating at the same rate as the toolholder produces alternations in the cutting force. This effect can be traced back to the successive phases of “impact” between the tool and the material used during the working process.