基于机器视觉的叶型孔测量技术研究

Measurement Technology of Blade-shaped Holes Based on Machine Vision

为了充分应对涡轴发动机中的叶型孔测量难题,基于机器视觉原理研制了非接触式四坐标测量系统,主要由三维运动机构、气浮回转工作台、工业视觉测头和照明光源构成。系统采用背向照明方式,并基于模板匹配的图像拼接方法获取被测叶型孔的全景图像。在测量过程中,通过三维运动机构与气浮回转工作台的配合运动,使工业视觉测头采集到目标叶型孔的多幅局部图像,通过图像拼接得到其全景图像,而后由图像处理和叶型参数分析获得被测叶型孔的几何尺寸和轮廓度等型面参数。为了验证该系统的功能,选取某个静子组件外环作为被测零件,应用该系统对零件上分布的某个叶型孔特征进行测量,获取到相应的型面轮廓数据,从而验证了机器视觉测量方法在叶型孔测量方面的可行性和有效性。

In order to cope with measurement problem of blade-shaped holes in turboshaft engine,a non-contact four-coordinate vision measuring system based on the machine vision principle is developed,which is composed of 3D motion mechanism,aerostatic rotary table,industrial camera and light source.In the system,back lighting mode and image mosaic based on template matching is used to derive the panoramic image of the target blade-shaped hole.In the measurement process,local images of the target hole are captured to composite into the panoramic image by the industrial camera with the motion cooperation of the 3D motion mechanism and aerostatic rotary table.To verify the function realization of the system,a stator outer ring is selected as the target part and the blade-shaped hole is measured by the system to derive its profile data,which verifies the feasibility and effectiveness of the machine vision measuring method in the measurement of blade-shaped holes.