For precise micro-EDM machine tools with high-speed pneumatic spindle, the parallelism between the axis of rotation and the existing Z axis directly determines the machining accuracy of tool electrode and workpiece, so it is necessary to adjust the parallelism between the rotary axis of the pneumatic spindle and the Z axis. Due to the small diameter and low rigidity of the tool electrode, the traditional contact metering method is difficult to apply. Therefore, based on the principle of micro-energy pulse discharge sensing, the diameter and center coordinates of the tool electrode are measured in different tool electrode sections, and the tilt between the pneumatic spindle and the Z-axis is calculated. Based on principle, the posture of the spindle is fine-tuned. This can easily and quickly adjust the parallelism between the pneumatic spindle and the Z-axis. Finally, the parallelism error of the measuring section is successfully controlled within 0.0015 mm.
In micro-milling, the diameter of the micro-milling cutter is smaller than tens of microns, making it difficult to achieve precise positioning with the workpiece, which affects the machining accuracy and the safety of the micro-milling cutter. To solve these problems, the coordinate system has been analyzed. A micro-milling precise automatic tool setting technology has been proposed, which based on the micro-energy pulse discharge sensing principle. A tool setting scheme is proposed to determinate the Central coordinates of workpiece, which is realized by repeating automatically the precise sense from four directions. Experiment is carried out to verify the feasibility and correctness of the technology by analyzing the perceived results.
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