Influence of Macro-Structured Tools on the Formability of Aluminum Alloys in the Cryogenic Temperature Range

• Published in: Key engineering materials Vol. 926; pp. 760 - 767
• Main Authors: Wolf, Alexander, Lafarge, Rémi, Grunow, Fabius, Brosius, Alexander, Tulke, Marc
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 22.07.2022
• Subjects: Alloys; Aluminum alloys; Aluminum base alloys; Blanking; Conduction cooling; Conduction heating; Conductive heat transfer; Contact stresses; Cryoforming; Cryogenic cooling; Cryogenic temperature; Deep drawing; Die drawing; Die forming; Die heating; Drawing dies; Formability; Heat flux; Hole drilling method; Residual stress; Software; Temperature; Residual Stress; Deep Drawing; Cryogenic Temperature; Macro-Structured Tools
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/p-nhu9o5

Aluminum materials are popular materials for research in terms of lightweight construction. How cryogenic forming can be used to increase material utilization in terms of resource efficiency is one of the areas being investigated. Subject of this study are numerical and experimental investigations regarding the formability of the aluminum alloy AA6014-T4 with macro-structured deep drawing tools at cryogenic temperatures. The macro-structure of the deep drawing dies significantly reduces the heat flux between the dies and the blank due to the reduced contact area. For this reason, active cooling or heating of the dies is not required. The process of heat conduction between the tool and the blank, as well as the deep drawing process, is calculated using the FE-method and compared with the experimental investigations. In addition, the induced residual stresses are determined using the hole-drilling method and compared with the computational solution. The presented examination shows an improved deep drawing ratio of the aluminum alloy AA6014-T4 at cryogenic blank temperature without active tool cooling. Additionally, the influence of the blank temperature on the forming regarding the residual stresses in the cups is analyzed and discussed.