Patent ID: 6384560
Filing Date: 2002-05-07
Classification: B23Q,G05B,Y10T

Abstract:
An abnormality detection apparatus for a tool to detect abnormalities of a tool used for machining of a machine tool comprising:cutting load detecting means to detect a cutting load on the basis of an electric current for driving that is output to a feed drive system of the machine tool and/or an electric current for driving that is output to a spindle drive system; feed load estimating means to estimate a feed load on the basis of a feed rate of the feed drive system, wherein the feed load is a load component depending on the feed rate; tool load detecting means to compute a tool load as a load component which depends on the tool by reducing the feed load estimated by the feed load estimating means from the cutting load detected by the cutting load detecting means; and abnormality judging means for a tool to judge whether the tool is in an abnormal condition or not on the basis of the tool load computed by the tool load detecting means.