Importance

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Abstract

Disclosed are a shaping tool and a method of using the shaping tool, capable of applying a sufficient compressive stress to a shaping member to prevent an excessively high tensile stress from being imposed on the shaping member so as to achieve an extended usable life even if the shaping member is made of a hard and brittle material. The shaping tool comprises a shaping member, a pressure-applying member surroundingly fitted onto the shaping member, a collet chuck surroundingly fitted onto the pressure-applying member, and a casing surroundingly fitted onto the collet chuck. The pressure-applying member has a plurality of outer peripheral slits and a plurality of inner peripheral slits, which are circumferentially arranged in alternate relation and at even intervals. The collet chuck has an externally-threaded portion at an upper or lower end thereof, and a taper surface formed in an outer peripheral surface thereof to have a diameter which gradually decreases toward the externally-threaded portion. The casing has an inner peripheral surface formed as a taper surface in surface contact with the taper surface. The collet chuck is adapted to be reduced in diameter by fastening a nut disposed above or below the casing to the externally-threaded portion, so as to apply a compressive stress to the shaping member.

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First Claim