| 摘要 |
PURPOSE:To make it possible o minimize the deflection of a tool end and also to perform grinding operation in short time by forming a cutting angle of relief with the slant of a cutting edge changed after machining was performed in the same way as a cylindrical grinding in a clamp type milling cutter. CONSTITUTION:Cylindrical bores 2 are arranged equally spacing each other on the periphery of a milling cutter body 1 and cylindrical cassettes 3 are pressed to fit in the holes and fastened by screws. While a projection 9 is in contact with a projection 9 is in contact with a bearing surface 7, the milling cutter body can be used as a milling cutter and since the cutting in this condition makes the angle of relief of the cutter 90 degrees and makes it impossible to use the cutter body as a milling cutter, the cutter body is rotated until a notch 10 is brought into contact with a rotation stopping plate 8 grinding a flank 11. After that, being returned to a former position, the cutting body forms a positive angle relief 12. Because the tool end is displaced in the vicinity of the position just under the rotary axis of the cutter body, the displacement 17 of the tool end height to a rotary angle 16 is sufficiently small and the dispersion is minimized. In this grinding, a chip 6 is shifted with a screw 13 loosened every several grindings. In order to tilt the chip 6, the cassette 3 is rotated by the tool fitted to a hole 14. |
