石油取芯钻具外管螺纹的结构分析和参数优化  

Structural Analysis and Parameter Optimization of Outer Pipe Thread of Score Drilling Oil

作　　者：薄瑞峰[1,2] 潘红军[1,2] 沈兴全[1,2] 闫帅印 

机构地区：[1]中北大学机械工程系,山西太原030051 [2]山西省深孔加工工程技术研究中心,山西太原030051

出　　处：《机械设计与制造》2014年第9期267-269,共3页Machinery Design & Manufacture

摘　　要：以某型号的石油取芯钻具外管螺纹结构优化为例,利用APDL语言建立外管接头螺纹的二维有限元模型,并对其进行了接触非线性有限元分析,对外管螺纹的强度进行分析校核,得出螺纹能够承受的最大扭矩.研究了钻杆螺纹牙数、牙型角、牙齿高和应力缓解槽等参数对螺纹强度的影响规律,并实现对牙齿高的优化.结果表明：需要保留的参数有牙数、牙型角和应力缓解槽;需要改进的参数为牙齿高,且变化范围在（1.7～2.0）mm.适当改变牙齿高,可以有效改善接头螺纹内部的应力分布状态,优化后的接头螺纹整体强度提高约14.07％.To a certain type of oil coring drill outer pipe thread structure optimization, for example, the use of APDL language to build a two-dimensional finite element model of the outer tube fitting threaded, it uses the non-linear finite element analysis to analyze it, checing the intensity of external pipe thread. It draws a conclusion that the thread can bear a maximum torque. The teeth, tooth type angle, tooth height and stress relief grooves of the drill pipe thread on the thread strength and other parameters are studied and optimized to the teeth height.The results show that： parameters that need to keep is teeth, tooth type angle and stress relief groove; parcuneter that needs to improve is the teeth height and it needs to range from 1.7ram to 2.0mm. Appropriately changes the teeth height can effectively improve the stress distribution of the joint internal threaded, the strength of optimized joint internal threaded increases approximately 14.07%.

关 键 词：ANSYS APDL 有限元 接触问题 优化设计 螺纹强度 

分 类 号：TH16[机械工程—机械制造及自动化] TP391.9[自动化与计算机技术—计算机应用技术]