钻杆内过渡带特性参数测试

RESEARCH IN MEASUREMENT FOR CHARACTERISTIC PARAMETERS OF INNER TRANSITION ZONE IN DRILL ROD

过渡带长度L和曲率半径R是评定钻杆内过渡带质量的重要特性参数。怎样描述过渡带曲线,如何检测R和L,一直是钻杆质量检验中难以解决的问题。本文提出以最佳拟合圆分段拟合过渡带曲线的方法,并相应研制成TZ—1型过渡带检测仪,其测量精度<2%。

The length L and the curvature radius R of transition zone are important characteristic parameters for evaluating the quality of inner transition zone in drill rods, How to describe the curves of transition zone and measure R and L has been a difficult problem in quality inspection of drill rods. In this paper, a method of fitting the curve of transition zone by segment, respectively with a best-fit-circle is proposed, and an instrument model TZ-1 for inspecting the transition zone is successfully developed. Its measurement error is within 2%.