||Press stiffness testing
||Olaizola, Guadalupe Mateos (Universidad de Navarra, Spain)
||Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
||Nowadays the forming processes tend to Net Shape and Near Net Shape forming, which consist in increasing the complexity of the component and in minimizing the number of steps in the production, in order to reduce production costs and to improve the quality of the final product. But this kind of processes requires high loads and this creates press deflections. Therefore EU-IMPRESS project (Improvement of Precision in Forming by Simultaneous Modeling of Deflections in Workpiece-Die-Press System) was undertaken to measure and characterise press stiffness as well as to predict interactions that occur in the workpiece-die-press system. The principal aim of this European project is to set up a finite element-based system for prediction of press deflections.
This master thesis is done as a part of EU-IMPRESS project, and it represents a part of work-package 8. This work-package deals with the measurements of press deflections carried out in a 1000 tons hydraulic press in Buurskov og Lassen in Holstebro (Denmark).
This master thesis has a double aim: the comparison between the experimental determined deflections and deflections predicted by finite element code FORGE3®, and the estimation of the quality of measurements done in Buurskov og Lassen. For estimate the quality of the measurements the uncertainty budget has been calculated by mean of application of GUM (Guide to the Expression of Uncertainty in Measurement).
Finally the experimental results and the predicted deflections are not coincident, thus the first attempt in validating has not given a positive evaluation. The analysis of possible errors and way to improve them are being carried out.
Part of this thesis has been developed in collaboration with Francesco Fiorese, a student of Management Engineering degree at University of Padova (Italy).
||Institut for Produktion og Ledelse, DTU
Creation date: 2006-06-22
Update date: 2007-02-24