Description
Cryogenic cooling is a cooling-lubrication strategy for machining difficult-to-cut materials. The absence of a lubricant in this cooling method constrains the technologies broad industrial application.
The research focus of this thesis is the development and testing of a system for mixing a lubricant into a cryogenic medium. Liquid carbon dioxide serves as cryogen. By different functional proofs it could be shown that a homogeneous mixing of the lubricant with the CO2 is not necessary to achieve an even lubricant application.
Subsequent investigations on cryogenic minimum quantity lubrication during turning of Ti-6Al-4V, X5CrNi18-10 and 42CrMo4 as well as during milling of XCrNiMoTi17-12-2 and Ti-6Al-4V showed a significant influence of the lubricants. Mineral oils, synthetic and native esters and fatty alcohols were used as lubricants. The process analysis proves that native lubricants can increase tool life and material removal rate compared to synthetic and mineral products.
An analysis of energy efficiency shows that longer tool life can significantly reduce energy consumption with cryogenic minimum quantity lubrication compared to conventional wet machining. The coolant lubrication strategy thus offers considerable potential for establishing sustainable production.
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