石油管锥螺纹齿高标准样块V形槽测量方法研究

摘要

Check blocks as one of the essential gauges in the process of OCTG thread parameters measurement,periodic calibration is required. This paper studies the recommended methods and measurement instruments of tapered thread V groove check block described in JJF 1063-2000 . Respectively through contour measuring instrument and 3D coordinate measuring machine to study the new measurement methods about crest-scraping and flank angle of the V-groove check block,both of the methods apply the least squares method to fit the scan curve and construct measured elements. The results showed that a combination of appropriate methods and the two instruments can absolutely fulfill the V-groove check block calibration requirements by many experimental verification and evaluation of measurement uncertainty. It also suggests that the content of the universal tool microscope should be gradually deleted out of the calibration specification.%齿高标准样块是石油管螺纹参数检测过程中必备的量具之一,需周期校准.针对JJF 1063-2000《石油螺纹单项参数检查仪》中关于齿高标准样块V形槽的测量要求,分别通过轮廓形状测量仪和高精度三坐标测量机对齿高标准样块V形槽截顶量及牙侧角进行测量方法研究,两者均采用最小二乘法拟合扫描曲线并构造被测要素.经大量试验验证及相应测量不确定度评定,结果表明:结合适当的测量方法,2种设备都能满足齿高标准样块V形槽的校准要求.提出应修订标准、淘汰基于万能工具显微镜的校准规范.