Product category:
Vertical machining centres (VMC)
News Release from: DMG (UK) | Subject: HSC Linear vertical machining centre
Edited by the Manufacturingtalk Editorial
Team on 25 September 2007
Ultrasonics aids hard machining in a VMC
Using ultrasonics frequencies up to 48kHz to vibrate a cutting tool in a VMC enables hard machining and high speed machining as well as machining conventionally in the same machine.
DMG is using ultrasonics to provide high frequency tool oscillation at a frequency of up to 48,000/s to enable hard machining, as well as high speed and conventional milling processes in the same spindle of a vertical machining centre When this capability is integrated with the added flexibility of 5-axis, five-face component machining and the higher productivity achieved by using linear axis drive technology, said DMG to manufacturingtalk, the latest DMG HSC Linear vertical machining centre offers a self-contained system for optimising production process in difficult materials
This article was originally published on Manufacturingtalk on 21 Jun 2001 at 8.00am (UK)
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The Ultrasonic HSC 20 Linear is now available from DMG (UK) of Luton, UK.
It has been developed for the mould and die, optical, medical semiconductor, automotive and sensor industries.
These sectors are demanding the productivity, accuracy and shorter lead time advantages of single operation technology when machining the likes of hardened material, moulds, lenses and prisms, implants, silicon, sapphire, carbon fibre, ceramics and graphite type materials, said DMG.
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The company added that the added cost of grinding and special process finishing operations, often required on these difficult to machine materials, can often be reduced or deleted altogether.
With a working envelope of 200mm in X-, Y- and Z-axis and controlled by Siemens 840D Powerline control, the machine uses its Ultrasonic HSK - Actor system to generate an axial oscillation of a diamond tool at a frequency of up to 48,000 times a second.
These pulsing cycles are combined with a simultaneous rotation of the tool having a diameter between 0.3mm and 3mm at up to 12,000 rev/min to remove micro-particles from the surface of the workpiece.
By maintaining a precise and continuous gap between the tool and workpiece, forces normally created in a conventional machining process are considerably reduced and high orders of surface finish can be maintained up to 0.2 micron Ra with less possibility of surface damage to the part.
Tool life is also extended, claimed DMG.
* High productivity milling - the Ultrasonic HSC 20 Linear is a high productivity milling platform through its high speed machining capability, with spindle speeds up to 40,000 rev/min, and the high dynamic advantages created through the use of linear drives and hydrostatic guideway technology.
Axis acceleration of 1.4G is achievable and the machine can be specified with a 4- or 5-axis configuration.
Continuous adaptive feed control is included with a further option of either 16 or 32 tool capacity magazine with automatic tool change.
The tool magazine has the ability to hold tools up to 30mm diameter, and accept both conventional and the ultrasonic tools to enable the combination of the two processes into a single programmed automated cycle.
Maximum rigidity and stability has been achieved by designing the machine around a gantry configuration on a cast Monobloc mineral base.
The portal frame is aluminium as standard but there is an option of a lighter carbon fibre construction giving even greater dynamic performance and improved thermal properties while enabling axis accelerations of more than 2G to be achieved.
Positioning accuracy is within plus/minus 2.5 micron and repeatability within plus/minus 1 micron via absolute measuring scales.
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