Predicting the Properties of Welded Roll Formed Tubes for Subsequent Processes Using the Finite Element Method

摘要

Determining and optimizing the properties of a tube semi-finish in advance of subsequent processes such as bending and hydroforming require simulation of the entire process chain. Every single forming step must be considered in terms of its influence on material properties. In many cases, for example hydroforming, one starts by simulating the forming operation with the ready tube, although major properties such as work hardening have already been defined by the production process in the tube welding plant. For this reason we commence our simulation as early as the roll forming phase, considering the individual forming steps in the process chain, i.e. roll forming, preparation for welding and calibration. Investigations show that these steps have a substantial effect on later tube properties, and that they can be influenced positively by adroit variation of the tube forming process.rnA computer program system is presented here by means of which the entire tube making process chain - roll forming, welding, calibration and even verification of the tube properties by means of hydro forming - can be mapped.