小径ドリルの折損検出法

概要

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This paper deals with a break-detecting method of a thin drill used in NC machine tools and machining centers. It is very difficult to detect a break of the thin drill less than 2 mm in diameter by the AE sensor with a high degree of accuracy. A transistor chopper circuit which has a very effective soothing reactor to control a dc motor at a constant torque is developed. In this chopper circuit, high speed transistors are employed and the current of the dc motor is always saturated perfectly. Thus, the breaking torqe can easily be detected even though the value is very small. An experiment for detecting the breaking torque is performed on the thin drills which have the diameters of 1, 1.5 and 2 mm, respectively. On the basis of the experimental results, it has been proven that the break-detecting method can be applicable to the thinnest drill of 1 mm in diameter.
社団法人日本機械学会の論文
1988-07-25