Prediction of the Amount of Tool Fracture in Face Milling Using Cutting Force Signal

절삭력 신호를 이용한 정면 밀링에서 공구 파손량 예측

Kim, Gi-Dae;Ju, Jong-Nam

  • Published : 2001.06.01


Tool fracture index(TFI) was developed in order not only to detect tool fracture but also to predict the amount of tool fracture in face milling. TFI is calculated by using peak-to-valley values of cutting force acting on teeth and their ratio between the adjacent teeth. When the tool fractures, a large value of TFI proportional to the amount of tool fracture was obtained periodically and decreased gradually. It was found that TFI is independent of cutter runout and it almost does not vary during transient cutting such as cutting condition change during machining. The threshold of tool fracture can be analytically determined by TFI developed in this paper, because the magnitude of TFI was shown to be dependent on the ratio of the amount of tool fracture to feed per tooth and immersion ratio. It was possible to predict the amount of tool fracture in experiments by using the proposed TFI.


Tool Fracture Index;Tool Fracture Amount;Face Milling;Cutting Force;Transient Cutting


  1. 김기대, 오영탁, 주종남, 1998, '밀링 공정시 공구파손검출(l) - 공구파손지수의 도출,' 한국정밀공학회지, 제 15권, 제 5호, pp. 100-109
  2. Martellotti, M. E., 1941, 'An Analysis of the Milling Process,' Transaction of ASME, Vol. 63, pp. 677-700
  3. Sabberwal, A. J. P., 1962, 'Cutting Forces in Down Milling,' International Journal of Machine Tool Design and Research, Vol. 2, pp. 27-41
  4. Altintas, Y., Yellowley, I. and Tlusty, J., 1988, 'The Detection of Tool Breakage in Milling Operations,' Transaction of ASME Journal of Engineering for Industry, Vol. 110, pp. 271-277
  5. Altintas, Y., 1988, 'In-process Detection of Tool Breakages using Time Series Monitoring of Cutting Forces,' International Journal of Machine Tools and Manufacture, Vol. 28, pp. 157-172
  6. Lee, J.M., Choi, D. K., Kim, J. and Chu, C. N., 1995, 'Real-Time Tool Breakage Monitoring for NC Milling Process,' Annals of the CIRP, Vol. 44, pp. 59-62