LOOKING AT THE RELATIONSHIP BETWEEN THE FRICTION CONDITIONS AND THE ENERGY AND FORCE OF THE EXTERNAL UPSET END PROCESS
Problem Statement (Relevance): The external pipe end upset technique is applied for oil well tubing with thicker ends. This article examines the upset process performed by the SMS Meer press running at the PNTZ OJSC site. To obtain reliable data about the process parameters, the process sequence was simulated with the help of the finite-element software package. Three different pipe sizes, which are of most interest to the site, were examined in the case study. Methods Applied: 3D-objects were made that imitate the workpiece, the upset die and the complex matrix. Each object was assigned its relevant properties. The simulation was done under given friction conditions, with the objects moving and positioned in space. The varying conditions included friction between the upset die and the workpiece. Findings: With the help of the model proposed, dependencies were identified between the upset force and the upset time at different friction factors. The experimental study conducted proves that the model is adequate to the real process. Practical Relevance: The values obtained as a result of simulation can be useful in the design of pipe end upset technologies, equipment and tools.