绳索取心钻杆负角度螺纹扭矩计算分析和测试研究

Calculation Analysis on Negative Angle Thread Torque of Wire-line Coring Drill Pipe and Test Research

分析了绳索取心钻杆负角度螺纹受力状态,以静力学和材料力学为基础计算了用于深孔绳索取心钻探的CNHT绳索取心钻杆螺纹应力情况和抗扭能力。同时,针对不同锥度和牙高的负角度螺纹进行了理论计算和静扭测试比对,理论计算结果与测试结果非常接近,确定了该计算方法的准确性,优化总结出抗扭能力较强的负角度螺纹参数。

The analysis is made on the stress state of negative angle thread of wire-line coring drill pipe, the thread stress situation and anti-twist property of CNHT drill pipe used for deep hole wire-line core drilling are calculated based on static and material mechanics. Theoretical calculations and static torsion test were taken on negative angle thread with different taper and tooth height. It is found that theoretical results and test results are very close; by which, the accuracy of the ealetdation method is determined and the parameters of negative angle thread with strong anti-twist property are optimized and summarized.