Transactions of Nanjing University of Aeronautics & Astronautics
Surface Roughness Model and Process of Brazed Diamond Tool Milling and Grinding Sapphire Dome
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Abstract:
Sapphire hemispherical domes are machined through milling and shaping using brazed diamond tools. A mathematical model describing roughness for this processing method is established， and the relationship between roughness and its influencing factors is analyzed. Experiments on the hemispherical dome shaping process are conducted to validate the model， analyzing the variation in roughness under different tool and workpiece rotational speeds. The results are consistent with the predictions of the established roughness model， suggesting that the model can be used to guide subsequent process experiments. Milling and shaping efficiency using brazed diamond tools typically can reach 14 g/min. The machined sapphire surfaces exhibit relatively few microcracks and minimal damage， with almost all exclusively visible grooves resulting from brittle fracture removal. The surface roughness after machining is below 2.5 μm. Milling sapphire domes with brazed diamond tools represents a novel shaping technique characterized by high efficiency and high quality.
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This work was supported by the National Natural Science Foundation of China （No.51675457） and the Jiangsu Key Laboratory of Precision and Micro-manufacturing Technology.
Clc Number:
TG71
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