仿生油管螺纹表面结构的优化研究

Optimization Research of Bionic Tubing Thread Surface Structure

针对油管螺纹粘扣问题,结合仿生技术通过有限元方法模拟API油管螺纹和仿生油管螺纹与接箍的拧接过程,结果表明,加入非光滑结构的仿生油管螺纹在标准工况下的最大接触应力明显低于API油管螺纹,并且应力分布较为平均。为了寻找最佳的仿生结构采用试验优化设计,对非光滑结构的直径、直径深度比、密度和分布牙数进行了优化,得出当在螺纹中部五个齿面上,每个齿上分布8个直径和深度均为150μm的仿生单元体时,油管螺纹的粘扣现象改善最佳。

Aimed at the tubing thread galling problem,the screwtogether process of API tubing thread and bionic tubing thread is simulate by using the finite element method combined with bionics tech- nology.The result show that the maximum contact stress of bionic tubing thread which is joined by the non- smooth structure is significantly lower than the API tubing thread in standard conditions ,and the stress dis- tribution is more homogeneous.In order to find the best bionic structure ,it makes an optimized design on parameters of diameter,diameter depth ratio,density and the distribution of teeth number,and finds out that tubing threaded galling phenomenon is improved best when there are 8 bionic elements which diameter and depth are 150μm on each teeth of five tooth surface in the middle of thread.