Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK
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PublicationFeindrehen von Gußeisen mit hohen Schnittgeschwindigkeiten( 1995)
;Spur, G. ;Becker, K.Lachmund, U.In the past years, rising requirements on productivity and quality have lad to high cutting speed. Especially superhard non-metallic cutting materials brought progress in this field. This study deals with high speed finishing of lamellar gray cast iron with ceramic cutting materials and cubic boron nitride. The results show that the application of high cutting speeds loads to a considerable reduction of processing times. Regarding the tool life the application of cubic boron nitrid, especially with cutting speedover Vc =1000m/min, yielded the best results. High surface qualities can be reached up to a cutting speed level of Vc=2000m/min.
PublicationFlexible clamping jaws for circular sections( 1994)
;Spur, G.Bahrke, U.Today the three-jaw chuck is the most commonly used clamping system in turning machines. In order to avoid damage of the work piece by clamping, the surface pressure between the clamping jaw and the work piece should be very homogeneous in the clamping surface. The aim is to develop flexible clamping jaws for circular sections that are able to self adapt the clamping surface over a wide range of work piece diameters. The adaptation to various work piece diameters and geometries should not lead to a reduction of another very important function of a clamping jaw - the exact positioning of the work piece in the chuck.