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The automotive industry requires more and more light materials with good strength and formability at the same time. The answer to this type of demands are, among others, aluminium alloys of the 6xxx series, which are characterized by a high strengthto-weight ratio and good corrosion resistance. Different material state can affect formability of AlMgSi sheets. These study analysed the influence of heat treatment conditions on the drawability of the sheet made of 6082 aluminium alloy. The studies on mechanical properties and plastic anisotropy for three orientations (0, 45, 90°) with respect to the rolling direction were carried out. The highest plasticity was found for the material in the 0 temper condition. The influence of heat treatment conditions on the sheet drawability was analysed using the Erichsen, Engelhardt-Gross, Fukui and AEG cupping tests. It was found that the material state influenced the formability of the sheet. In the case of bulging, the sheet in the annealed state was characterized by greater drawability, and in the deep drawing process, greater formability was found for the naturally aged material. [ABSTRACT FROM AUTHOR]

The article describes a test stand with a spindle equipped with an active bearing preload system using piezoelectric actuators. The proper functioning of the spindle and the active system was associated with the correct alignment of the spindle shaft and the drive motor. The article presents two methods of shaft alignment. The use of commonly known shaft alignment methods with dial indicators is insufficient from the viewpoint of being able to control this preload. This work aims at making the readers aware that, for systems with active bearing preload, the latest measuring devices should be used to align the shaft. The use of commonly known methods of equalization with dial gauges is insufficient from the point of view of controlling this preload. Increasing the accuracy of shaft alignment from 0.1 to 0.01 mm made it possible to obtain a 50% reduction in the displacement of the outer bearing ring during spindle operation. [ABSTRACT FROM AUTHOR]