Estimate of consumed energy at backward extrusion process by means of modelling approach

In order to predict the consumed energy in backward extrusion process (on Al 99.5F7 specimens), the analytic (10 models), numerical, stochastic and experimental modelling of deformation work on the basis of multi-factorial experimental designs (by means of the rotatable design of experiments) was done. Thus, results of backward extrusion force versus punch motion with five different coefficients of friction and five different wall thicknesses were obtained. The most important factor contributing to the accuracy of modelling is the plastic curve of material, for that reason the experimental investigations (compression testing on specimens circle divide20 mm x 20 mm) were performed and results in form of Hollomon-Ludwik's power law were obtained. Investigations in this paper were supported with: data processing system, measuring sensors and Lab View software. Experimental research of deformation work was done for both the checking and the verification of obtained results. (C) 2004 Published by Elsevier B. V.