Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (1): 72-80.DOI: 10.11890/1006-7191-101-72

• 研究论文 • 上一篇    

FORMING PROCESS AND NUMERICAL SIMULATION OF MAKING UPSET ON OIL DRILL PIPE

郝长千   

  1. 湖南省长沙市中南大学校本部机电工程学院
  • 收稿日期:2009-08-12 修回日期:2009-12-06 出版日期:2010-02-25 发布日期:2010-02-09
  • 通讯作者: 郝长千

Forming process and numerical simulation of making upset on oil drill pipe

Huaping TANG1,2, Changqian HAO1, Yongzheng JIANG1, Lei DU1   

  1. 1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
    2. School of Mechanical Engineering, Nantong University, Nantong 226007, China
  • Received:2009-08-12 Revised:2009-12-06 Online:2010-02-25 Published:2010-02-09
  • Contact: Huaping TANG

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关键词: oil drill pipe, constitutive equation, end upsetting, numerical simulation

Abstract:

The flow stress behavior of grade G-105 steel (API　 standard) for oil drill pipe in hot compressive deformation was　 studied by isothermal compression tests on Gleeble-1500　 thermal-mechanical machine. Referring to established empirical　 formulas, the constitutive equation of the flow stress for G-105　 steel was obtained. For the grade G-105 oil drill pipe　 (φ114.3×10.92　mm), through proper design of the die and　 applying suitable process parameters, and using coupled rigid　 viscoplastic thermo-mechanical finite element method, the forming　 process of making upset on oil drill pipe was numerically simulated.　 The simulation results show that the internal transition section of　 the oil drill pipe is not only continuous and smooth but also long　 (up to about 220-250mm).

Key words: Oil drill pipe, Constitutive equation, Endupsetting, Numerical simulation