会议论文详细信息
IDDRG2016 conference on "Challenges in Forming High-Strength Sheets".
Investigation of surface finishing of carbon based coated tools for dry deep drawing of aluminium alloys
Steiner, J.^1 ; Andreas, K.^1 ; Merklein, M.^1
Institute of Manufacturing Technology, Department Mechanical Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 13, Erlangen
91058, Germany^1
关键词: Carbon based coatings;    Environmental awareness;    Friction and wear behaviors;    High wear resistance;    Hydrogenated amorphous carbon;    Resource efficiencies;    Tribological behaviors;    Tribological conditions;   
Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/159/1/012022/pdf
DOI  :  10.1088/1757-899X/159/1/012022
来源: IOP
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【 摘 要 】

Global trends like growing environmental awareness and demand for resource efficiency motivate an abandonment of lubricants in metal forming. However, dry forming evokes increased friction and wear. Especially, dry deep drawing of aluminum alloys leads to intensive interaction between tool and workpiece due to its high adhesion tendency. One approach to improve the tribological behavior is the application of carbon based coatings. These coatings are characterized by high wear resistance. In order to investigate the potential of carbon based coatings for dry deep drawing, friction and wear behavior of different coating compositions are evaluated in strip drawing tests. This setup is used to model the tribological conditions in the flange area of deep drawing operations. The tribological behavior of tetrahedral amorphous (ta-C) and hydrogenated amorphous carbon coatings with and without tungsten modification (a-C:H:W, a-C:H) is investigated. The influence of tool topography is analyzed by applying different surface finishing. The results show reduced friction with decreased roughness for coated tools. Besides tool topography the coating type determines the tribological conditions. Smooth tools with ta-C and a-C:H coatings reveal low friction and prevent adhesive wear. In contrast, smooth a-C:H:W coated tools only lead to slight improvement compared to rough, uncoated specimen.

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