A Differential Light Intensity-Modulation Optical Fiber Bundles Designed for Milling Tool Vibration Measurement

Binghui Jia,Jing Yu

doi:10.1109/access.2021.3088462

Abstract

Tool vibration occurs widely in various machining operations and is one of the main factors affecting machining quality and stability. Light intensity-modulation optical fiber displacement sensor has distinctive advantages and greatly potential in tool vibration measurement. In order to overcome the shortages of conventional reflective light intensity modulation fiber bundle in small measurement range or low sensitivity, a novel differential light-intensity optical fiber bundles were proposed for measuring the high-speed milling tool vibration displacement. The mathematical model was demonstrated based on differential light-intensity modulation principle for sensing characteristics analyzing in this paper, firstly; then, the static calibration platform and the dynamic experiment platform were established to verify the differential light intensity-modulation characteristic of the fiber bundles; in the end, the static calibration experiment results shown that the measurement range of the differential light-intensity fiber bundles is more than 2mm, which expanded the measurement range of conventional fiber bundle by two times while improving the sensitivity obviously. The dynamic experimental results confirm the operating principle of differential light-intensity optical fiber bundles well. It has greatly availability applied for on-line precision measurement of tool vibration in milling machines.

Highlights

CNC milling machine plays an irreplaceable role in processing and manufacturing
Because the vibration signal obtained directly determines the results of tool condition monitoring, fault diagnosis and performance evaluation, on-line tool vibration measurement technology have long been a key problem in high-speed milling
The shortages of conventional reflective light intensity modulation fiber bundle without desirable measurement range and sensitivity are overcomed in tool vibration

Summary

INTRODUCTION

CNC milling machine plays an irreplaceable role in processing and manufacturing. Tool vibration occurs widely in various machining operations and is one of the main factors affecting machining quality and stability. The laser displacement sensor needs to be specially designed and installed far away from the tool system in milling vibration measurement [10]; The microphone does not have strong anti-interference ability, and it is very sensitive to the noise in machining. The reflected light intensity modulation optical-fiber displacement sensors have simple structure, small size, ease integration, electromagnetic interference resistance, corrosion resistance and high detection sensitivity, those advantages make it especially suiting for the precision vibration displacement measurement of high-speed motion target [15-18], and be conductive to early unstable tool vibration information acquisition and recognition. In this paper, based on the principle of conventional reflective light intensity optical fiber displacement sensor, a differential light intensity modulation fiber bundles were put forward for the precision measurement of high-speed milling tool vibration.

CONVENTIONAL LIGHT INTENSITY MODULATION PRINCIPLE

EXPERIMENT RESULTS AND DISCUSSION

IV.CONCLUSION