Using the Upper-Bound Method to Calculate the Upsetting Forces for Oil Pipes

Resumo

The upper-bound method is used to calculate the upsetting force. Novelty is the realism of the modeled velocity field of metal in the deformation zone. The calculated upsetting force is shown to be in agreement with available industrial data. The analytical expression derived is used in the press control algorithm and software to determine the rational upsetting force for various tool designs and pipe dimensions.