摘要
双台肩螺纹以其高抗扭能力,在钻井作业过程中得到广泛应用。然而双台肩螺纹加工精度要求高,致使国内很多厂家生产的双台肩钻杆螺纹接头达不到设计要求。切削热是影响双台肩螺纹接头加工精度的主要因素之一。为研究切削热对双台肩螺纹加工精度和连接强度的影响,建立了一种基于CAE协同仿真的方法:通过建立双台肩螺纹车削加工的有限元模型,分析其在加工过程中的温度场分布情况;然后建立双台肩螺纹接头的温度-变形模型,研究温度场对螺纹变形的影响,即加工精度影响;通过建立三维的螺纹接头有限元计算模型,评价切削热所引起的加工误差对双台肩钻杆螺纹接头连接强度的影响。通过研究得出,切削热引起的螺纹牙单侧面轴向变形约0.014 8 mm,该变形量将导致接头抗扭和抗拉性能下降30%,且大幅度降低了压缩载荷或弯曲载荷作用时的使用寿命。因此加工应考虑切削热的影响,提出了相应的改进措施,并计算了多种常用切削用量下的变形量。
Double shoulder tool joint was widely accepted for it＇ s highly torsion resistance ability. However, the machining accuracy of double shoulder tool joint is strictly, that lead to lots of productions fall short of design require. Cutting heat is one of the main reasons to affect the machine accuracy. In this paper, the authors establish a method of co-simulation based on CAE to research the affection of double shoulder tool joint machining accuracy and connection strength. Set up the thread lathe turning process FEM, analyze the distribution of temperature field ; and then establish the heat-deformation FEM of double shoulder tool joint to research the affection of machining accuracy; establish the 3D tool joint connection FEM to analyze the affection of connection strength. It can be concluded that the axial deviation of the thread tooth is 0. 0148mm, and the deviation lead to 30% decrease of torsion and tension resistance ability, and greatly reduced the service life while compression and bending load apply. We suggest that compensate the deformation of heat, proposed some improve measurements, and computed the compensation of many back engagements.
出处
《机械强度》
CAS
CSCD
北大核心
2015年第2期307-311,共5页
Journal of Mechanical Strength
基金
石油天然气装备教育部重点实验室(西南石油大学)资助项目(OGE201401-01)
国家自然科学基金项目资助(51004082
51222406)
四川省科技厅项目(13ZA0178)资助~~
关键词
双台肩
钻杆接头
切削热
加工精度
连接强度
Double shoulder
Drill pipe joint
Cutting heat
Machining accuracy
Connection strength
