| 摘要 |
The present invention relates to a clamping device to clamp an object to be clamped having a pull stud and a cutting hollow flow path, through which cutting oil passes. According to an embodiment of the present invention, the clamping device comprises: a collet into which the pull stud of the object to be clamped is inserted; a piston clamp having a clamp hollow flow path, through which cutting oil passes, and a sleeve accommodating groove formed to have a stepped pulley in the clamp hollow flow path, to move the collet forward or backward and to clamp or unclamp the pull stud of the object to be clamped; a first sleeve accommodated in the sleeve accommodating groove of the piston clamp, whose one end unit has the same diameter or longer as that of the cutting hollow flow path of the object to be clamped to come in contact with the pull stud; and a second sleeve inserted into the first sleeve to be able to slide, whose one end unit has a shorter diameter than that of the object to be clamped to be inserted into the cutting hollow flow path. The present invention aims to effectively suppress the leakage of cutting oil while clamping an object to be clamped. |
