IJAT Vol.11 No.2 pp. 215-225
doi: 10.20965/ijat.2017.p0215


Integrated Chatter Monitoring Based on Sensorless Cutting Force/Torque Estimation in Parallel Turning

Yuki Yamada*,†, Takashi Kadota*, Shinya Sakata*, Junji Tachibana**, Kenichi Nakanishi***, Manabu Sawada***, and Yasuhiro Kakinuma*

*Department of System Design Engineering, Keio University
3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan

Corresponding author

**PMAC Japan Co., Ltd., Tokyo, Japan

***Nakamura-Tome Precision Industry Co., Ltd., Ishikawa, Japan

August 25, 2016
October 31, 2016
March 1, 2017
chatter, multi-tasking machine tool, parallel turning, observer, sensorless monitoring
Parallel turning technology is considerably important in future multi-tasking machine tool because it has the potential to enhance the stability limits, compared to turning operations using a single tool. Although stability prediction models for parallel turning have been developed recently, the technique of in-process monitoring of chatter is almost out of focus. In this study, the monitoring of chatter based on the sensorless cutting force/torque technique was evaluated in the parallel turning and cutting of the same surface of an elongated workpiece. Two cutting force/torque estimation methods were evaluated: a conventional disturbance observer (DOB) using internal information from a servomotor and a multi-encoder-based disturbance observer (MEDOB) using load-side position/angular information as well. In the DOB-based monitoring, chatter frequency components were observable regardless of the guideway type and drive system. However, chatter monitoring may be difficult when the angle of the servomotor is changed slightly because of the damping properties of the sliding guideway. In the MEDOB-based monitoring, the waveform of the estimated cutting force reflected the vibrational state at the cutting point well, and the extraction of chatter frequency components became easier regardless of the guideway type.
Cite this article as:
Y. Yamada, T. Kadota, S. Sakata, J. Tachibana, K. Nakanishi, M. Sawada, and Y. Kakinuma, “Integrated Chatter Monitoring Based on Sensorless Cutting Force/Torque Estimation in Parallel Turning,” Int. J. Automation Technol., Vol.11 No.2, pp. 215-225, 2017.
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