| 摘要 |
PROBLEM TO BE SOLVED: To prevent the vibration at a deep hole machining start point of a machining shaft when a deep hole is drilled on a bottom face of a taper hole. SOLUTION: This is a jig supporting a machining shaft drilling a deep hole 12 on a bottom face 11a of a taper hole 11 formed on an end face 10b of a workpiece 10. It forms a conical trapezoidal shape fitted in the taper hole 11, a shaft hole 15b passing through and supporting the machining shaft 6 so as to rotate and slide in the axial direction is formed at the center thereof, an oil passage 15d supplying coolant to a cutting part 7 at a tip of the machining shaft is formed, and it is fitted and mounted in the taper hole 11 to support the vicinity of a machining start point of the deep hole 12 of the machining shaft 6. Consequently, the cutting part 7 of the machining shaft 6 is stably supported to prevent the vibration, and it is possible to drill the deep hole 12 having high precision and high quality on the bottom face 11a of the taper hole 11.
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