Abstract
Metal-bonded grinding wheels offer particular benefits for the grinding of difficult-to-machine materials. Such wheels have superior dimensional and thermal stability, and more quickly dissipate the grinding heat. To in-process dress the metal-bonded diamond wheels of complex contours with the high-precision, wire electrical discharge dressing (WEDD) was used to remove the excess metal material on the surface. A prototype CNC machine tool based on the WEDD method was developed. Some novel designs were proposed to improve the dressing precision and performance. An air spindle with sub-micron runout was used to clamp the metal-bonded diamond wheels, which aims to decrease the runout of the dressed wheels. A specially designed wire guide was used to limit and minimize the positional fluctuations of wire electrodes. To dress the complex shape grinding wheel, the C-axis was designed to adjust the angle of the wire guide relative to the wheel to be dressed, which avoided motion interference between them. In addition, a high-low-voltage power supply was developed. By using the high ignition voltage, it is possible to form the discharge channel under a large gap, and thus the grinding wheel with the large diamond grain of the size 75~90 μm could be dressed. WEDD of a metal-bonded diamond grinding wheel was performed on the developed prototype machine tool. The experimental results demonstrated that the developed prototype could realize the dressing of the grinding wheel with a runout of less than 2 μm. The grinding experiments showed that a better grinding surface with Ra less than 0.8 μm was obtained.
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Funding
This research is supported by the Fundamental Research Program of Shanxi Province (20210302124209), National Nature Science Foundation of China (Grant No. 51605323), and Key Research and Development Program of Shanxi Province (Grant No. 201903D121048).
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The realization of this technology was mainly completed by Laijun Zhang. Xiuzhi Wang and Huliang Ma participated in the construction of the experimental device and the discussion of experimental results. Xiuzhi Wang, Jianyu Jia, and Zan Li participated in the discussion of the experimental results. Yanqing Wang proposed the main novel design ideas and provided guidance on research directions.
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Xiuzhi Wang and Yanqing Wang are corresponding authors.
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Zhang, L., Wang, X., Wang, Y. et al. Metal-bonded diamond wheel dressing by using wire electrical discharge: principle and prototype machine design. Int J Adv Manuf Technol 131, 2677–2690 (2024). https://doi.org/10.1007/s00170-023-12163-w
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DOI: https://doi.org/10.1007/s00170-023-12163-w