科研之友
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摘要
A novel method was presented to prevent surface defects, mainly burrs generation, in micro milling process. Burr formation mechanism was analysed in machining and it was found that negative shear plays a critical role in burr generation, especially near the workpiece boundaries. In order to eliminate its effect, low melting point alloy was selected to extend the boundary of the workpiece as auxiliary support. Therefore, burrs were formed on low melting point alloy, which were removed by melting it off afterward and the burrs-free component was thus achieved. Experiments were carried out on a micro milling machine and aluminum alloy was machined with micro end milling tools. The results revealed that most burrs were prevented and there was no contamination on the workpiece surface. The paper concluded with further discussions on the potential applications of the method.
