| 摘要 |
The present invention provides a die holder wherein before inserting a die into a die installation hole, a clearance is obtained for easy insertion, whereas after insertion, the die can be locked in position without a gap, thereby allowing the die to be precisely locked in position using simple operations. A die holder body 13 has an expandable ring-shaped chamber 14 disposed around a die installation hole 13a therein and which comes in contact with a die 5 to tighten and lock it all over its circumference The chamber 14 is enlarged and contracted under the pressure of a working fluid such as oil which is sealed therein. The working fluid can be pressurized by screwing a pressure-applying screw 18 into a fluid passage 17 leading to the inside of the chamber 14.
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