NUMERICAL-SIMULATION OF MULTI-BLOW FORGING PROCESSES USING THE EXPLICIT TIME INTEGRATION FINITE-ELEMENT METHOD

Describes simulations of impact forging processes. Uses the explicit t ime integration finite element method, which is based on direct time i ntegration of equation of motion, to compute the deformation of the wo rkpiece and the dies. Uses the program developed to simulate the coppe r blow test performed on a 350,000J counter-blow hammer. The calculate d result reveals a good agreement in the final deformed configurations between the experiment and the explicit simulation. In order to compa re this with the explicit method, the implicit time integration rigid- plastic finite element program considering the inertia effect is also applied to the copper blow test simulation. its a result of the copper blow test simulation using the explicit program and the implicit prog ram, finds that the calculated results have good agreements in availab le plastic deformation energy, forging load and equivalent plastic str ain distribution. Finally, applies the developed program to simulation s of multi-blow forging processes. Presents three major findings from the multi-blow forging simulations: (1) the continuous analysis techni que used for the multi-blow forging simulations works well; (2) the bl ow efficiency and the forging load generated by blow operations can be analysed efficiently and simulated results coincide with previous exp erimental and analytical ones; (3) the geometrical configuration of th e workpiece is closely related to blow efficiency.