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Sensors and Materials, Volume 31, Number 11(2) (2019)
Copyright(C) MYU K.K.
pp. 3575-3582
S&M2032 Research Paper of Special Issue
Published: November 15, 2019

Implementation of an Add-on Device that Monitors the Sound of a Machine Tool and Automatically Suppresses Chatter [PDF]

Wei-Chen Lee, Hsu-Cheng Cheng, and Ching-Chih Wei

(Received April 20, 2019; Accepted September 4, 2019)

Keywords: chatter suppression, machine monitoring, CNC controller, add-on device

The application of the Industrial Internet of Things in a factory to connect machines is a topic that has attracted considerable attention in recent years. After connecting the machines, we can usually obtain the data from the controllers of the machines. However, the controller manufacturers usually do not allow users to remotely change the status of the controllers owing to safety or other reasons, which makes it challenging to enable the machines to adapt to the environment by using sensors. With the acknowledgment of this problem, the objective of this study was to develop an add-on device to provide an alternative solution to control some of the machine behaviors. Our device, based on an embedded system, is equipped with sensors and actuators, including a microphone, a CMOS webcam, stepper motors, and a pneumatic cylinder. After the device is installed on the control panel of a computer numerical control (CNC) machine tool, it can allow users to execute the machining process to cut the materials remotely and monitor the process automatically. Additionally, the device can detect chatter by using the microphone, which is the audio sensor, and suppress chatter automatically by adjusting the spindle speed and feed rate knobs through the mechanism on the device. From the experimental results, the surface roughness of a workpiece can be improved by about 68% after the chatter suppression. The information displayed on the control panel can also be captured by a webcam and processed with optical character recognition (OCR) so that it can be saved as a text file in our device. This information can then be used for the further improvement of the manufacturing process of material cutting.

Corresponding author: Wei-chen Lee

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Cite this article
Wei-Chen Lee, Hsu-Cheng Cheng, and Ching-Chih Wei, Implementation of an Add-on Device that Monitors the Sound of a Machine Tool and Automatically Suppresses Chatter, Sens. Mater., Vol. 31, No. 11, 2019, p. 3575-3582.

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