| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermal displacement quantity operation device of a feed screw in a feeder, which reduces cost, improves measuring accuracy of a thermal displacement quantity, and also improves a flexibility of an installation position, by reducing the number of part items. SOLUTION: A base end part 16c of the feed screw 16 is axially immovably supported by a bearing stand 12, and a front end part 16d is axially movably supported by a bearing stand 13. Air is injected from an air injection nozzle 25 toward a spiral groove 16b formed in the feed screw 16, and the feed screw 16 is rotated, and pressure of the air is detected by a pressure detector 29. A thermal displacement quantity of the feed screw 16 is arithmetically operated on the basis of previously arithmetically operated and stored reference coordinates and actual coordinates newly provided by performing an arithmetic operation, by arithmetically operating coordinates in the axial direction of the feed screw 16 on the basis of a rotational quantity of the feed screw 16 and the pressure detected by the pressure detector 29. COPYRIGHT: (C)2008,JPO&INPIT
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