对于提高大型工件轴孔加工的精度和效率，孔心的精确定位至关重要。提出了一种基于激光位移传感器的非接触式回转逼近孔心定位方法。将传感器固定于机床的执行切削的旋转主轴上，并将主轴旋转中心置于理想圆心附近。在机床旋转的同时，分别沿与主轴轴线正交且相互垂直的两个方向上移动主轴，直到测量变化量达到最小(理论上可以为零)，此时可以认为轴孔中心达到重合。利用逼近式孔心定位方法，可以快速精确定位与机床关联的圆心的相对坐标，从而指导后续加工。由于采用非接触测量方法，保障了测量的安全性。实验结果表明，此方法能够提高孔心的定位精度和效率。

Pinpointing hole center is crucial for machining shaft hole of large-scale workpiece. In order to improve the precision and efficiency of workpiece machined, an approximation hole center positioning method is proposed by rotating laser displacement sensor without angular coordinate. Laser displacement sensor is installed on the rotatable spindle, and the rotatable spindle is placed randomly at a different position around hole center. Spindle is moved along two directions respectively, which are mutually perpendicular and both perpendicular to spindle on machine tool, resceltin in the alteration of sensor data. With the application of the approximant positioning method of hole center, relative coordinate of hole center to machine tool can be obtained quickly and accurately, which could accurately guide the subsequent machining. The experimental results show that this method can be used to improve the accuracy and efficiency of hole center positioning.