Abstract
The change of spindle temperature field is an important factor which influences machining precision. Many methods of spindle temperature field measurement have been proposed. However, most of the methods are based on the electric temperature sensors. There exist some defects (e.g., anti-interference, multiplexing, and stability capacity are poor). To increase the temperature sensitivity and reduce strain sensitivity of the bare Fiber Bragg Grating (FBG) sensor, a cassette packaged FBG sensor is proposed to measure spindle temperature field. The temperature characteristics of the packaged FBG sensor are studied by comparative experiment with traditional thermal resistor sensor. The experimental results show that the packaged FBG sensor has the same capacity of temperature measurement with the thermal resistor sensor but with more remarkable antiinterference. In the further measurement experiment of the temperature field, a spindle nonuniform temperature field is acquired by the calibrated FBG sensors. It indicates that the packaged FBG sensor can be used to measure the temperature field for the spindle of machine tool.
Highlights
The accuracy of CNC machine tool is the most important pursuit for researchers
Due to the correlation between temperature sensitivity coefficient and the coefficient of thermal expansion (CTE), Fiber Bragg Grating (FBG) will expand with the substrate when it is embedded in a substrate
In order to compare the measurement result with the FBG sensor and monitor the nonuniform temperature field of the spindle when the lathe machine is under loading, the thermal resistors are located at locations 1, 2, 3, and 4
Summary
Errors that affect the machine tool accuracy can be classified into geometric errors, thermal errors, and cutting force-induced errors. Among these errors, thermal errors account for 70 percent of the total errors [1]. Uhlmanna and Hu presented an FEM model to predict the thermal behavior of a high speed motor spindle [6] They predicted that the nonuniform temperature field makes the spindle axis uplifted and tilted and seriously affects the machining accuracy of the machine tool. The advanced sensors and measurement methods are the hot fields of study to realize high-precision thermal error compensation. The experimental results show that the temperature field of spindle is nonuniform and that gravity and cutting force are the major factors
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