Product category:
Vertical machining centres (VMC)
News Release from: Traub Heckert UK | Subject: Hermle C800U vertical machining centre
Edited by the Manufacturingtalk Editorial
Team on 15 April 2002
Five-side machining performed with high
output
A VMC fitted with the patented Albech, NC-driven trunnion-based indexing unit in order to form a flexible machining cell is able to achieve high levels of accuracy and and productivity.
Five-sided machining of up to 20 similar, or totally different components in the same machine setting, is being demonstrated at the Brackley headquarters in Northamptonshire of Traub Heckert UK The demonstrations are being performed on the latest Hermle C800U vertical machining centre which has been fitted with the patented Albech, NC-driven trunnion-based indexing unit in order to form a flexible machining cell able to achieve high levels of accuracy and productivity
This article was originally published on Manufacturingtalk on 22 May 2001 at 8.00am (UK)
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At each component station, parts can be accommodated within a diameter of 140mm and with a total weight of up to 50kg per face of the unit.
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In addition, the ability of the C800U to machine different components in a single cycle means sets of parts can be completed in 'one-hit' ready for assembly.
The C800U is the mid-range gantry construction CNC vertical machining centre of the Hermle range with spindle options up to 40,000 revs/min.
The design eliminates any spindle overhang typical of a C-frame machine construction and provides a very stiff production structure.
Each of the three main axes are achieved by moving the spindle and the relative motions are therefore divorced from any influence of component weight variations held on the indexing trunnion unit.
The Hermle C800U gantry bridge has three separate guideways, the third being central to and set back from the two outer guideways which, in effect, halves the bearing span.
By placing a single drive unit in line with the central carriage on the bridge this reduces any angular reaction force on the two outer guides while forces on the central guide are vertical.
The mineral cast bed ensures low thermal expansion with excellent shock and vibration absorption and is designed with the guideway axes and drive components positioned outside and above the machining area.
As a result, contamination from swarf and coolant on the guideways is eliminated.
The tool changer is positioned just behind and close to the spindle, negating the need for a change arm.
The 30 tool capacity disc magazine rotates in a horizontal plane and is driven by an AC servo motor through planetary gearing with a chip to chip tool change time of six seconds.
Tool exchange takes place through an opening in the rear of the machine.
Working volume is 800mm by 600mm by 500mm with an acceleration of 5m/sec2 to rapid traverse rates of 35m/min.
Positional accuracy is within 0.008mm.
Spindle power is 25kW giving 10,000 revs/min as standard with options of 16,000, 24,000 and high speed 40,000 revs/min.
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