Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Micro-texture dependent temperature distribution of CVD diamond thick film cutting tools during turning of Ti-6Al-4V
    ( 2022)
    Uhlmann, Eckart
    ;
    Schröter, D.
    ;
    Gärtner, Eric
    Machining titanium alloys such as Ti-6Al-4V results in a high thermomechanical load on cutting tools and consequently short tool lifes. With respect to a necessary reduction of the resulting cutting tool temperatures, ultrashort pulse (USP) laser fabricated micro-textured rake faces offer direct supply of cooling lubricant into the cutting zone and lead to a reduced heat induction. As a result, micro-textured CVD diamond thick film cutting tools are also capable of machining high-performance materials due to reduced contact temperatures. In the scope of the research, the resulting temperature distribution for micro-textured rake faces will be compared under both dry and wet process conditions. Measurements show a reduction of the resulting cutting tool temperatures of Δϑt = 27.9 % using micro-textured cutting tools compared to non-textured cutting tools. A validated simulation provides valuable information about the contact temperatures enabling a specific development of the micro-texture geometry. As a result, a reduction of the contact temperature between chip and rake face by ΔϑT = 24.7 % was possible.
  • Publication
    The machining of soft magnetic materials with TiN coated HSS tools.
    ( 1989)
    Spur, G.
    ;
    Byrne, G.
    ;
    Onikura, H.
    Soft magnetic materials find common application in electronic and electrical engineering as well as in information technology. The nickel-iron family of soft magnetic materials exhibit very poor machinability as evidenced by the extremely short tool life which arises when machining using classical tool materials. In addition cutting operations lead to a deterioration in magnetic properties of magnetically annealed components. In this article the experimental results obtained when machining MUMETALL with TiN coated HSS and other tool materials are reported. Results of investigations into the tool wear mechanisms and surface integrity are presented and discussed for the turning, milling and drilling operations. The detailed investigation of the scatter of tool life results obtained when milling with indexible inserts is explained in terms of reproducable quality of the cutting tools coated using the PVD process.