| 摘要 |
PURPOSE:To automate smoothing operation in a die manufacturing process by providing a grinding tool and a grinding attachment for use in the die manufacturing with means for continuously keeping a grinding stone in surface contact with the work surface in the normal direction and rotating the same at a high speed. CONSTITUTION:A grinding stone 1 includes a ring-shaped base 6 and a plurality of stone chips 9 composed of borazon 10 and stone base material 11 and attached to the base 6 annularly at equal intervals through an elastic member A composed of a hard elastic material 7 and a soft elastic material 8. A stone holder 3 for holding the grinding stone 1 and a wheel spindle 4 are coupled to each other through a universal joint 5. The wheel spindle 4 has a spherical extreme end 4a which is rotatably fitted into a central spherical depression 3a of the stone holder 3. A locking pin 12 extends through the depression 3a so as to transmit rotational movement of the wheel spindle 4 to the stone holder 3. Furthermore, there is provided a constant-pressure urging device D in which a moving rotary shaft 22 is vertically movably supported by a frame 24 through a bearing 26 and the shaft 22 is urged downwardly by a spring 21.
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