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Citizen’s Evolution version of the K-Series CNC sliding-headstock turn-milling centre can now provide additional savings on non-cutting times.

This is due to its incorporation the latest high-speed CPU technology with new control software, direct spindle indexing and improved overlapped functions.

As a result, machining cycles – especially on more complex multi-featured components – can be reduced even further using the same tooling and settings against the previous generation of Citizen’s K-Series machines.

The K16E-VII is to be launched on the Citizen-Miyano stand at Mach 2010 to demonstrate the results of reducing the processing time that is able to slash tool selection, the switching of machining patterns, faster chuck opening and closing, and spindle indexing.

Already on trial components, Citizen has reduced non-cutting (idle) times by 9.4sec equal to a 45 per cent saving on a 45sec turn-mill cycle against the time taken on a non-Evolution K16.

Improved overlapping functions and direct spindle indexing are key elements in the new control, enabling the positioning of the next tool as the previous tool starts to retract and by eliminating the time for the normal process waiting for the spindle to stop, reference and index.

This is now replaced by controlled spindle deceleration to its programmed position, which contributes savings on cycle time, especially when multi-featured elements such as flats, slots and off-centre positions are required on a component.

The new control has faster start up and quicker screen switching, and introduces automatic listing of G and M codes accompanied by pictorial explanations.

Program editing can be performed by copy and paste between synchronised displays.

The K16E-VII has a maximum machining diameter of 16 by 200mm machining length in a single chucking.

The main spindle is powered by 3.7kW motor producing 15,000rev/min and the 0.75kW subspindle has a top speed of 10,000rev/min.

The machine can carry up to 23 tools set on Citizen’s pyramid tool layout that helps reduce tool change time and, through an independent back tool post, parallel front and back machining can be carried out.

The back tool post can also be used to create eccentric drilling and slitting features required on the end face of a component by specifying an optional driven tool unit.

In total, seven tools can be used for turning and up to eight are driven for cross/face machining tasks, with four fixed for front machining and four for fixed back operations with the option of being driven.

Rapid traverse rates are 32m/min with high acceleration and deceleration.

Citizen Machinery

Citizen is the world leader in CNC sliding head ‘one-hit’ turn-milling technology. It has a range of machines having a maximum bar capacity between 4 mm on the compact micro-machining capable Citizen R04 to 32 mm on the top of the range Citizen M32-VII which has the added capability of two Y-axis cross-feeds.   

The M32 can carry up to 80 tools, of which 20 can be driven, and can cut with three tools simultaneously giving low cycle times and high levels of productivity.  Also, fully automated unmanned cycles can be utilised through an integrated gantry option and conveyor system that helps ensure damage free parts during uninterrupted batch production.  A high pressure 2,000 psi CoolBlaster coolant system is a further option to optimise swarf control, tool life and machining difficult materials.

Following the acquisition in Japan in 2008 of 65 per cent shares in Miyano, the fixed head turning centre specialist, the two companies are maintaining their separate high profile brand names utilising a single sales operation.  However, turn-milling solutions from bar up to 64 mm diameter can now be provided.  In addition, with the Miyano range of turning and turn-milling machines for chucking operations, cell-type applications can now be accommodated with a wide range of automation options.   

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