圆弧刃刀具刀尖圆弧精密测量

Circular Arc Measurement of Rounded Cutter

摘要:

圆弧刃刀具刀尖圆弧参数会影响加工尺寸精度、表面质量和刀刃耐用度,研磨和测量的精度要求已达微米甚至亚微米级别;针对其本底噪声强、圆弧刃直线刃过度不明显等问题,提出结合形态学闭运算、滑动窗口三点定圆和空间矩法,分步实现圆弧初、精定位;实验结果表明,算法具有较强的抗噪能力,可快速对0.2~0.8 mm的刀尖进行直线刃与圆弧刃正确分离,圆弧半径、圆度误差测量精度达亚微米量级,角度测量精度达0.1°。

Abstract:

The parameters of circular arc of a rounded cutter affects the machining precision, surface roughness and cutter durability. Accuracy requirements of grinding and measuring of a cutter has reached micron order or even submicron. At present, the main problem is different background noises and unconspicuous transition of arc-edge and linear-edge. The paper introduces morphologic closing operation for noise reduction, uses circle determination with three points in the sliding window for rough location of the arc, and adopts spatial moment for sub-pixel precision. The results show that the proposed method is robust, and the separation of arc and line is fast and accurate for cutters of radius from 0.2mm to 0.8mm. The precision of arc radius and roundness error is submicron order, and the precision of arc angle is 0.1 degress.