| 摘要 |
A long-life electrode for electrical discharge drilling units is composed of an elongated cylindrical body (2) which has, at an upper end, a tang (2a) for fitting on a supporting and rotatably motorized chuck (M); a plurality of peripheral channels (3) are formed in the body of the electrode, concentrically to a cylindrical central channel, have an annular cross-section and are mutually spaced by way of corresponding means (4); the corresponding ends (3a) of the channels (3) that are directed towards the tang (2a) are respectively connected to pressurized fluid dispensing means (5), the opposite ends (3b) being open and arranged at right angles to a surface (S) to be drilled. <IMAGE> |
