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Item type:Publication, Access status: without files , Cutting carbon footprint with smart tool management and cemented carbide (WC-Co) upcycling(Institutionelles Repositorium der Leibniz Universität Hannover, 2024-07); ; ; During the production of a small to medium-sized aircraft, approximately 250,000 rivet holes are required. These must be manufactured according to strict aviation specific technical, quality, and safety standards. High-quality cemented carbide (WC-Co) drilling tools are used to ensure the necessary precision and durability. However, the high energy requirement for production, especially for sintering the WC-Co blanks, and grinding the final tool geometry negatively impacts the carbon footprint of aircraft production. This study aims to analyse the environmental impact of each step in the WC-Co tool production chain and proposes innovative methods to upcycle worn tools without the need of conventional recycling processes. To reduce the climate impact, a novel smart digital tool management system is introduced containing digital twins of the individual tools. This system is complemented with three new methods of upcycling WC-Co drilling tools: regrinding worn tools to smaller diameters, applying a PVD-coating to compensate for diameter deviations, and de- and recoating diamond coatings on WC-Co tools. Preliminary results in modelling the climate impact show that these strategies can reduce the carbon footprint by up to 53 %.Publicationtype: Conference Paper69 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Novel tuned mass damper mitigating chatter vibrations of slender boring bars with small diameter(Organ des VDI-Kompetenzfeldes Informationstechnik (VDI-KfIT), 2023-08-14); ; ; Tuned mass dampers are a wellestablished method for reducing chatter vibrations in turning operations with long cantilevered boring bars. The tendency to chatter increases with increasing length and decreasing tool diameter. This paper presents a novel tuned mass dampers for boring bars with diameters down to 10 mm. Its design is based on numerical modelling. Machining tests carried out show the significantly improved process stability.Publicationtype: Journal Article49 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Model based design of tuned mass dampers for boring bars of small diameter(Elsevier, 2023-05); ; ; ; Tuned mass dampers (TMD) are an established method to reduce self-excited chatter vibrations in turning. Regarding boring bars, the susceptibility to chatter increases with increasing length and, even more, with decreasing tool diameter. A novel TMD for boring bars with diameters down to 10mm is presented. The TMD-design, consisting of a mass and a spring-damper combination, is based on analytical and numerical modelling. By using a futed boring bar design, the available design space allows to place a damping mass of sufcient mass ratio at the tool tip. Cutting tests showed the reduction of vibrations.Publicationtype: Conference PaperScopus© Citations 2 43 413 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Tuned mass dampers for boring bars with small diameter(Plansee Group Service GmbH, 2022-05); ; ; ; Publicationtype: Conference Paper30 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Zerspanung von gesintertem Hartmetall : Grundlagen und AnwendungHanser Tagungen "Schwer zerspanbare Werkstoffe in der industriellen Praxis", Vortrag, Digitales EventPublicationtype: Conference Paper124