一种基于虚拟基准的虚拟环规——检测螺纹的新方法

提出一种基于计算机CCD视觉和虚拟基准的螺纹虚拟环规检测技术 ,给出在螺纹轴截面和正交投影间基准转换的关系式 ,根据该转换关系建立虚拟基准 ,指出了按“虚拟基准”构筑“虚拟量规”的新概念。虚拟环规法检测效率高 ,成本低 ,非接触测量 ,易实现自动在线检测。研制出了原理样机 ,实现了用虚拟螺纹环规对螺钉的逐个检测及与普通实体环规比对的 10 0 %吻合

Virtual ring: a new technique of screw measurement

A novel screw fastener virtual ring (VR) measurement technique based on CCD computer vision and virtual datum (VD) is proposed. The transformation relationship from the screw axial section to its orthogonal projection is given. VD be built based on the relationship. The new VR is constructed according to the VD. Virtual ring test method has some characteristics such as high efficiency, low cost, non-contact detection and easy to realize on-line automation measurement. The prototype is successfully developed and the metrological correspondence match between the tradition ring gauge and the VR technology is 100 percent.