Product category:
Vertical machining centres (VMC)
News Release from: Mori Seiki UK | Subject: Mori Seiki NV5000 VMC
Edited by the Manufacturingtalk Editorial
Team on 10 July 2002
'Final word' VMC cuts cycle times by up
to 20 %
By drastically redesigning a vertical machining centre, spindle acceleration and deceleration time has been reduced by 44% and 58% and axes acceler- ation rates raised between factors of 1.5 and 2.7.
Having drastically redesigned its vertical machining centre, Mori Seiki has reduced spindle acceleration and deceleration time by 44% and 58% and raised axes acceleration rates between factors of 1.5 and 2.7 The result is the advanced NV5000, which is capable of reducing existing work cycle times by over 20%
This article was originally published on Manufacturingtalk on 5 Jun 2001 at 8.00am (UK)
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Mori Seiki engineers discussed how they arrived in creating the 'final word' in vertical machining centres (VMC).
It was not a matter of increasing axes travels and spindle speeds.
More important was to reduce downtime by increasing the acceleration rate of moving elements - the spindle and the axes feed rates.
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In doing so, the engineers, through wide application of digital design, have produced a more compact machine when compared with the previous generation of VMCs.
The NV5000 specification is for a VMC with a machine table of 1100mm by 600mm and axes travels of 800mm, 510mm and 510mm in X, Y and Z.
Axes acceleration rates have been increased 1.5 times in X to 4.38m/sec2, 1.7 times in Y to 3.8m/sec2 and no less than 2,7 times in Z to 7.29m/sec2.
Main spindle runs up to 12,000 rev/min compared with 10,000 rev/min before, while spindle acceleration/deceleration rates have been reduced by 44% and 58% respectively, such that the NV5000 reaches full spindle speed of 12,000 rev/min in 0.97sec compared with 1.74 sec to reach 10,000 rev/min in the previous model.
The spindle decelerates to zero in just 0.91sec compared with 2.16 sec before.
A further aid to reducing downtime is the increase in tool change speed.
The NV5000 changes tools in 2.6-3.1 sec chip-to-chip compared with 3.1-3.6 sec before.
Synchronised tapping is also 1.5 times faster on the NV5000, with maximum tapping speed increased to 4,200 rev/min.
Also the spindle head has been redesigned to reduce its length by two-thirds to 550mm to achieve a shorter more dynamic unit.
All of these improvements have been accomplished while maintaining high cutting accuracy.
A roundness machining test in cast iron using a 20mm, four-flute, solid carbide end mill at a spindle speed of 400rpm and a feed speed of 160mm/min in Grade FC250 cast iron produced a roundness error of just 3.2 micron on a cut circle diameter of 140mm.
Some impressive results in terms of reducing downtime in machining cycles have resulted.
For example, in machining two pockets in a block of aluminium, 680mm by 500mm, the previous Mori Seiki VMC model required 14 tools and 1766 sec to complete it.
The NV5000 took only 1474 seconds to complete - a total machining cycle time reduction of 16.5%.
As more individual features have to be pocket-milled, drilled, bored, countersunk and tapped, and more tools are required, then the greater is the machining time saving.
Such a job in aluminium required 12 tools and 239 sec to machine a central pocket and a series of holes.
The NV500, with its faster acceleration rates, reduced that time to 185 sec - a healthy saving of 22.7%.
The compact machine tool structure design of the NV5000 was achieved through 3D CAD working, checked repeatedly against FEM analyses.
The result, apart from achieving a stiffer structure, is a reduction in 'footprint' to 1460 wide, 2710mm deep and 2600 height.
The CNC is a new generation of Mori Seiki's MAPPS operating system with Information Technology support.
The highly user-friendly operator interface includes straightforward interactive programming, backed up by a wide range of machining and organisational software and ready connections with external networks.
A truly modern VMC for high precision, economical machining. Request a free brochure from Mori Seiki UK ...
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