Innovations in cutting technologies such as the application of advanced work material concepts, together with needs for non-pollutant machining processes, increased flexibility and improved cost-effectiveness trigger the application of high performance processes, imposing higher stresses on tools. This often reveals inadequate wear resistance in conventional tool materials. Coating technology is one means of achieving a crucial enhancement in tool performance. An example is given with view to the automotive industry where light materials like hypereutectic Al-Si alloys (Si content 17-25 wt.-%) are used for tribological applications. The main problem in machining these materials is abrasive tool wear which is caused by hard Si crystals. Comprehensive tests show that the suitability of the cutting tool material depends mainly on the hardness of the reinforcements and clarify that the relation between the grain size of the cutting materials and the size of the reinforcement also influence the dominant sub-types of abrasive wear. So microcracking and fatigue occur when cracks are induced into the cutting tool material by high dynamic loadings. As there is such a huge variety of available coating materials (TiN, TiC, DLC, diamond, cBN, MoS2, WC/C), coating structures and coating processes (PVD, CVD) careful selection of a suitable coating system is essential. Using accessible know-how concerning coated cutting tools and their behaviour in a wide range of different machining tasks, the paper shows methods to test, evaluate and influence the properties of tool coatings. The authors propose that the demands for ecological machining and high cutting speeds will enhance substitution and compensation for the lost functions of the cooling lubricant. Since CVD-diamond coatings are very successful in machining of non-ferrous materials, it could be very attractive to have a suitable superabrasive coating for the machining of steel, too. CBN in theory could be such a coating material. Even as a multiphase microcrystalline material it may be possible to develop coated cBN tool application, although to date this has not been clearly demonstrated
Coated tools for metal cutting - features and applications
2001
17 Seiten, 21 Bilder, 46 Quellen
Aufsatz (Konferenz)
Englisch
Spanen (mit Kontur) , Spanwerkzeug , Überzug (Beschichtung) , verunreinigender Stoff , Kostenreduzierung , übereutektische Legierung , Aluminiumsiliciumlegierung , Werkzeugverschleiß , dynamische Belastung , Mikroriss , Materialermüdung , PVD-Beschichten , CVD-Beschichten , Stahl , CBN (kubisch kristallines Bornitrid) , Trend (Entwicklung) , Stand der Technik , Leichtmetalllegierung
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