| 摘要 |
The present invention is intended to easily and accurately bore a center hole at an appropriate position on a material crankshaft. A center hole boring device of the present invention is configured to bore a center hole for working on each of the two end surfaces of a material crankshaft (1). The center hole boring device includes a main clamper (15), centripetal chucks (16), and work cutting tools (17). The main clamper (15) holds and fixes the material crankshaft (1). The centripetal chucks (16) hold the two ends of the material crankshaft (1) held by the main clamper (15) while keeping a posture of the material crankshaft (1) held by the main clamper (15) for measuring a shape of the material crankshaft (1). The work cutting tools (17) bore a center hole on each of the two ends of the material crankshaft (1) held by the main clamper (15). |
