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With its D-EPDx diamond-coated end mills, Hitachi offers wafer-thin tolerance and long-lasting tool life in high-speed cutting of graphite electrodes.

With the D-EPDx solid carbide end mills, the thick layer of diamonds is mounted on a specially-developed substrate that is ground to an undersize.

This guarantees extremely close tool tolerances, said Hitachi.

The HD coating ensures that abrasion is much delayed and then only occurs slowly, which virtually removes any risk of suddenly exceeding tolerance limits.

Hitachi supplies the high-speed tools as two-edged ball mills with a diameter of 1-10mm, and as two-edged torus mills with a diameter of 1-4mm.

For diameters of 6-10mm, the torus mills are supplied in a four-edged version.

D-EPDx tools are robust and the recessed design allows them to be used for machining depths of up to 30 times their nominal diameter.

Hitachi Tool Engineering

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