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SPINDLE DEVICE OF MACHINE TOOL

  • US 20100119320A1
  • Filed: 03/27/2008
  • Published: 05/13/2010
  • Est. Priority Date: 03/29/2007
  • Status: Active Grant
First Claim
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1. A spindle device of machine tool comprising:

  • a spindle rotatably supported by a housing;

    a rod movably supported along an axial direction in the spindle;

    a collet that clamps and unclamps a tool by movement of the rod;

    a biasing unit that biases the rod in a tool clamping direction by the collet;

    a drive that presses the rod against a biasing force of the biasing unit to move the tool in an unclamping direction;

    a rod-pressing-force detecting unit that detects a pressing force to the rod by the drive;

    a rod-displacement detecting unit that detects displacement of the rod;

    a tool-clamping-force detecting unit that detects a tool clamping force by the collet based on the pressing force to the rod detected by the rod-pressing-force detecting unit and the displacement of the rod detected by the rod-displacement detecting unit; and

    a replacement-timing determining unit that determines a replacement timing of the biasing unit based on the tool clamping force detected by the tool-clamping-force detecting unit and a preset biasing force characteristic value of the biasing unit.

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