Turn milling
The rotary milling is a machining manufacturing process, in which the operations of the rotating and milling are combined by using a knife end mill - at a perpendicular to the cutter workpieces are machined, which usually - rotating workpiece rotationally symmetrical are. The self-propelled milling cutter works with a longitudinal feed parallel to the workpiece.
A distinction is made between two variants of the rotary milling process:
- With orthogonal turn milling, the tool axis and the axis of rotation of the workpiece are arranged vertically. With an axial feed movement and a rotation of the shaft, the milling cutter travels a helical movement relative to the workpiece, which means that rotary milling is a variant of screw milling .
- With axis-parallel rotary milling, both axes of rotation are parallel to one another; the arrangement of the milling tool enables both internal and external machining.
The axially parallel rotary milling is used for the food processing used (inside or outside). When machining shafts with this process variant, very large side milling cutters are usually used. As an alternative to these large and cost-intensive tools, orthogonal turn milling, for example shell end or torus milling cutters, is particularly suitable for shaft machining. Coated hard metals or CBN and ceramics are mostly used as cutting materials.
When it comes to the arrangement of the axes, a distinction is made between centric and eccentric arrangement:
- With centric turn-milling, the axes of the tool and the workpiece intersect at one point,
- With eccentric rotary milling, the axes of the tool and the workpiece are offset from one another by an amount known as eccentricity .
High surface quality (low facet formation) can only be achieved with turn-milling through extreme settings of the milling cutter and shaft speed.
With the rotary milling technology, eccentric components can be machined at high cutting speeds, which otherwise have to be eccentrically rotated or whirled at low cutting speeds . In the manufacture of relief grooves on crankshafts , around 80-90% of the manufacturing time could be achieved compared to conventional manufacture using rotary milling, while at the same time improving the surface quality.
Individual evidence
- ↑ Weinert, Klaus .: Machining Technology . 3rd edition. Vulkan-Verlag, Essen 2001, ISBN 3-8027-2925-0 , p. 25-28 .
- ↑ Werner Degner, Hans Lutze, Erhard Smejkal: Spanende Formung: Theory, calculation, reference values . Carl Hanser Verlag GmbH & Company KG, 2015, ISBN 978-3-446-44583-3 , p. 351 ( google.de [accessed on January 3, 2019]).
- ^ Fritz Klocke: Manufacturing process 1: Machining with a geometrically defined cutting edge . Springer-Verlag, 2018, ISBN 978-3-662-54207-1 , p. 560 ( google.de [accessed on January 3, 2019]).
- ↑ Wilfried König: Manufacturing process 1: turning, milling, drilling . Springer-Verlag, 2013, ISBN 978-3-662-07202-8 ( google.de [accessed on January 3, 2019]).