Time filter

Source Type

Winterthur, Switzerland

Schnell M.,Rieter Machine Works Ltd.
Melliand International | Year: 2012

With its high operating speed of up to 450 m/min and 120 spinning units, the J 20 air-spinning machine from Rieter leads the productivity scale. Thanks to the newly developed duo-spinning unit, the J 20 offers maximum yarn quality, productivity and flexibility.

Schnell M.,Rieter Machine Works Ltd.
Melliand International | Year: 2014

The new J 20 air-jet spinning machine by Rieter with 200 spinning units per machine is twice as long as conventional air-jet spinning machines, which is made possible by the unique machine design and innovative automation.

Wyen C.-F.,Rieter Machine Works Ltd. | Wyen C.-F.,ETH Zurich | Jaeger D.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Wegener K.,ETH Zurich
International Journal of Advanced Manufacturing Technology | Year: 2013

The influence of the cutting edge micro geometry on cutting process and on tool performance is subject to several research projects. Recently, published papers mainly focus on the cutting edge rounding and its influence on tool life and cutting forces. For applications even more important, however, is the influence of the cutting edge radius on the integrity of the machined part. Especially for titanium, which is used in environments requiring high mechanical integrity, the information about the dependency of surface integrity on cutting edge geometry is important. This paper therefore studies the influence of the cutting edge radius on surface integrity in terms of residual stress, micro hardness, surface roughness and optical characterisation of the surface and near surface area in up and down milling of the titanium alloy Ti-6Al-4V. Moreover, the influence of the cutting edge radius on burr formation is analysed. The experiments show that residual stresses increase with the cutting edge radius especially in up milling, whereas the influence in down milling is less pronounced. The influence of the cutting edge radius on surface roughness is non-uniform. The formation of burr increases with increasing cutting edge radius, and is thus in agreement with the residual stress tests. © 2012 Springer-Verlag London Limited.

Smolenicki D.,ETH Zurich | Boos J.,ETH Zurich | Kuster F.,ETH Zurich | Roelofs H.,Swiss Steel AG | Wyen C.F.,Rieter Machine Works Ltd.
CIRP Annals - Manufacturing Technology | Year: 2014

In order to represent actual cutting process conditions, an in-process tribometer is examined to measure friction during orthogonal turning process at cutting speeds up to 300 m/min. The tribometer consists of a spring preloaded tungsten carbide pin with spherical tip mounted behind the cutting edge and rubbing on the freshly generated workpiece surface. The pin preload is set according to feed force. A 3D-force measuring device in the fixation of the pin allows evaluating friction coefficient from tangential and normal forces. Experiments show strongly different results when contacting fresh and oxidized surfaces and decreasing friction coefficient with increasing cutting speed. © 2014 CIRP.

Stampfer A.,Rieter Machine Works Ltd.
Melliand International | Year: 2013

The exclusive use of 1,000 mm (40") diameter cans in spinning preparation improves profitability due to higher machine efficiency, reduced personnel requirements and lower capital costs. Rieter offers an automated can changer for this can format at all process stages in spinning preparation (Fig. 1).

Discover hidden collaborations