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When compared to copper electrodes, graphite electrodes have a smaller cutting resistance and a smaller coefficient of thermal expansion and contraction, making them more suitable for processing thin-wall structures. However, processing graphite electrodes can also be challenging and prone to edge breakage. Experienced engineers have come up with guiding principles to minimize breakage during graphite processing.

  1. To prevent the edge of the workpiece from collapsing when cutting to the exit, a small section is pre-milled at the processing exit end.
  2. Adopt a downward milling approach where the cutting direction of the cutting edge is opposite to the feed direction.
  3. The cutting depth should not exceed 1/3 of the diameter of the milling cutter.
  4. Set the vacuum cleaner wind speed as follows: processing area >150 m/min; Dust discharge outlet >600 m/min.
  5. Replace any failed tool promptly.
  6. Improve the tool line speed and reduce the feed rate for better results.
  7. Use high-quality, fine-grained graphite materials whenever possible.

 

A critical recommendation is to use the CVD pure diamond-coated integral milling cutter, which has a slight friction coefficient. The integral grinding ensures accurate geometry, making it an ideal tool for preventing edge breakage of graphite parts and processing thin-walled graphite parts.

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