Investigation of the eccentricity and residual stresses variations due to the tilting of the die in tube drawing process for steel tubesWednesday (28.09.2016) 17:51 - 17:54 Part of:
In the production of the tubes, reducing the wall thickness variations, named as eccentricity, gives the possibility to save the material, with a clear cost saving potential for cost-intensive materials. Dimension exactness and restricted tolerances are two other reasons for a mechanism to be able to control the eccentricity during tube production. On the other hand, eccentricity increases the weight of the finished product, if the design has to follow the weakest point in the part. Along eccentricity, residual stresses, which are generated during the production of a tube, have a huge influence on the application of the tubes, to be considered in the production procedure.
In this investigation the effects of tilting of the die out of the center-line on the eccentricity and residual stresses were investigated for steel tubes. For this reason, different tilting angles were used to draw the tubes and their effect on the eccentricity as well as residual stresses was investigated. Depending on the die set-up, a decrease or even increase in eccentricity after drawing with a tilted die resulted. The dependency of eccentricity on the tilting angle could be clearly described by an algorithm.