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Five-axis machining centre can also turn
A
NCMT product story
Edited by the Manufacturingtalk editorial team
Mar 8, 2006
Five-axis CNC vertical machining centre offers a 1,000 rev/min trunnion-mounted table, allowing components to be turned in conjunction with a static tool in the spindle.
Five-axis CNC machining is becoming increasingly popular for producing moulds and other complex components in a single clamping, due to the higher accuracy, shorter machining times and lower production costs that result.
New to this sector is the MU-500VA vertical machining centre from the Japanese manufacturer, Okuma, represented in the UK by NCMT.
The machine distinguishes itself by offering a 1,000 rpm table, allowing components to be turned in conjunction with a static tool in the spindle.
If this option is chosen, an HSK-A63 taper has to be specified instead of the standard 40 taper spindle.
The design is based on a fully integrated trunnion swivelling horizontally through +20/-110 deg and carrying a 360 deg rotary table.
They respectively add A and C axes to an X,Y,Z envelope of 1250mm x 660mm x 540mm.
Maximum weight of component that can be supported is 500kg.
It is the speed and accuracy of the direct-drive rotary axes that sets this machine apart from most.
Even trunnion rotation is fast at 50 rev/min, which is the standard specification for the table, repeatability being 0.001 deg.
Both rotary elements are robust, providing greater rigidity than add-on compound units.
Speed of operation extends to the linear axes, with 40m/min rapid traverse in X and Y, 32m/min in Z, the latter speed also being the maximum cutting feed rate throughout the entire working volume.
Spindle options are 11 or 22kW, delivering up to 15,000 rev/min, while table drive for turning is rated at 15kW.
There is also a choice of magazine capacity of 20, 32 or 48 stations, automatic tool change time being fast at 1.8s.
In common with all of Okuma's latest machine tools, the multi-functional, 12-tonne MU-500VA has been designed to minimise machining inaccuracies due to heat variation in the machine structure and spindle, despite ambient temperature change of as much as 8 deg C.
The patented Thermo-Friendly Concept won the Japan Society of Mechanical Engineering Award in 2002.
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