The Upsetting Forging Process And Numerical Simulation For A New Type Of Sucker Rod

In recently years, with the development of petroleum industry, the upset forging technology of sucker rod has been constantly improved in our country. We have developed many new types of sucker rods to meet the need of different oil wells. They are applied in actual production and obtain good social benefits and economic benefits. Different from traditional sucker rods, they adopt new materials, new technology and new structures, so they have high property and long service period. The plug-in torque rod is a new kind of sucker rod which has a skewed slot and convex wedge at its two ends. The plug-in joint model can solve relative rotation between the sucker rods, avoiding the eccentric wear and break-off.At first, the development and application of sucker rod and the metal plastic simulation method are introduced briefly. Besides, the basic principle of process analysis and die design for sucker rod is expounded concretely.By means of numerical simulation and experimental study, this article makes a deep research on the precision forging process of plug-in torque rod and its key process technology. By analyzing the forging process of the plug-in torque rod, two forming process schemes are drafted and their process parameters are adjusted. According to the forming process, three dimensional entity models of the sucker rod and its forging die are set up. After choosing appropriate process parameters, the whole forging procedure are analyzed and simulated with finite element analysis software DEFORM-3D. The results indicate the inner stress field, strain field, temperature field and forging travel-load curve during the forming procedure. The forming statuses, causation of defect of workpiece are also predicted. When grasping the metal flowing law, meanwhile, considering the die manufacturing cost and the forming stability, this thesis finally determines the optimum forming process scheme.The process parameters have been properly adjusted to make the forming process and upset forging die more reasonable. For further research on upset forging process and FEM simulation, some opinions and suggestions are put forward. At present, the die has been successfully used in the production of plug-in torque rod and achieved good social and economic benefits.