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    • 8. 发明公开
    • DRILLING APPARATUS
    • BOHRVORRICHTUNG
    • EP2127790A1
    • 2009-12-02
    • EP08710714.0
    • 2008-02-01
    • Nitto Kohki Co., Ltd.
    • OTSUKA, Kenji
    • B23B47/18B23Q5/22B23Q5/58B23Q15/08B23Q17/09
    • G05B19/4065B23Q5/22B23Q11/04B23Q17/0961B23Q17/0995G05B2219/42289Y10T408/17Y10T408/675
    • A cutting tool having a small diameter is prevented from being heavily loaded to prevent a reduction in service life thereof. An electric drill that rotationally drives an annular cutting tool by using a drill motor (46) as a drive source is brought close to a workpiece by a drill feed unit having a feed motor (20a) to drill the workpiece with the annular cutting tool. In the course of drilling, the motor current of the drill motor (46) is detected by a motor current detector (50). A main controller (64) compares the result of detection by the motor current detector (50) with a preset reference value to identify the tool diameter of the annular cutting tool being used for drilling and sets a control mode for each tool diameter according to the identification result.
    • 防止具有小直径的切削工具被重负荷以防止其使用寿命的降低。 通过使用钻机马达(46)作为驱动源旋转地驱动环形切削工具的电钻通过具有进给马达(20a)的钻进给单元靠近工件,以使工件与环形切削工具钻孔。 在钻井过程中,电机电流检测器(50)检测钻机马达(46)的马达电流。 主控制器(64)将电动机电流检测器(50)的检测结果与预先设定的基准值进行比较,以识别用于钻削的环形切削刀具的刀具直径,根据刀具直径设定各刀具直径的控制模式 识别结果。