| 摘要 |
PROBLEM TO BE SOLVED: To secure strong retention force in attaching a tool such as a drill to a tool holder to be installed on a machine tool with shrinkage fit by thermally expanding a recess part of the tool holder greater than coefficient of thermal expansion of the tool holder to increase interference for shrinkage fit. SOLUTION: In a device combining a recess part for fitting and a shank part of the tool as a protruding shaft by inserting the shank part into the recess part under a condition that a chuck part including the recess part for fitting is thermally expanded, and then by cooling both parts, the chuck part as the recess shaft is provided with a layer of high thermal expansive material having a higher coefficient of thermal expansion than material of the recess shaft on outer circumference part thereof. COPYRIGHT: (C)2004,JPO
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