油管螺纹图象的测量方法  

Measurement of oil tube thread image

作　　者：何富君[1] 张瑞杰[1] 崔旭明[1] 兰爽[1] 

机构地区：[1]大庆石油学院机械科学与工程学院,黑龙江大庆163318

出　　处：《大庆石油学院学报》2004年第3期51-53,共3页Journal of Daqing Petroleum Institute

摘　　要：在油管螺纹非接触测量系统中 ,通过对螺纹图象的测量 ,获得了各项几何尺寸 ,建立了从螺纹图象坐标到空间坐标的坐标变换 .根据螺纹图象上的螺纹牙轮廓对测量特征点进行采样 ,并对特征点进行最小二乘法拟合 ,在拟合直线的基础上给出了螺纹几何尺寸的数学表达式 .该方法可测量螺纹的锥度、螺距、螺纹夹角和螺纹高度 ,测量精度可以满足工业测量要求 .Oil tube thread dimensions can be obtained by measuring thread image with the non-contact measuring system. A transform is set up to change the dimensions in image coordinate to the real ones in spatial space. The outline of thread teeth are extracted from thread image and the feature points are picked up, which are fitted into lines by least square method. The equations for thread taper, thread pitch, thread angle and height of thread can be derived on the base of fitted lines, which are accurate enough to meet the needs of industrial measurement.

关 键 词：油管螺纹 图象测量 拟合方法 几何尺寸 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]