Next-generation CNC system

Posted on 13 Jun 2018 and read 364 times
Next-generation CNC system A next-generation CNC system featuring a touch-screen and a qwerty keyboard were features on the new Cincom D25-VIII and -VII sliding-headstock turn-mill centres being demonstrated by Bushey-based Citizen Machinery UK Ltd (www.citizenmachinery.co.uk).

The D25-VIII is configured as a 10-axis sliding-head machine with a 25mm-diameter capacity.

It incorporates a swivelling B axis (0-135deg) in the first gang-tool-post (X1, Y1 and Z1 axes), which can hold four double-sided driven spindles and access both the main spindle and the sub-spindle.

A second gang-tool-post (X2, Y2, Z2) can work independently or simultaneously with the first tool-post to overlap rough- or finish-turning operations, for instance, or apply drilling- or milling-based cycles in unison.

Further machining flexibility is provided by a (Y3) back tool-post with one fixed or three driven tools offering 90deg adjustment for face, radial or angle machining; there is also an ‘opposite’ tool-post alongside the sub-spindle (X3, Z3), which provides a further two fixed-tool positions.

There is an overall capacity for up to 59 tools. The machine also offers the advantage of removable guide bush for more-economic material use on shorter components.

The power of the main spindle is 5.5kW, with 3.7kW available for the 25mm-capacity sub-spindle; both offer a maximum speed of 10,000rev/min. The gang-driven tools are powered by 2.2kW drives with maximum speeds of 9,000rev/min, while the back driven-tool speeds are 6,000rev/min.

Rapid-traverse rates are 32m/min, with 24m/min available on the Z2 gang tool-post. Low-frequency vibration (LFV) cutting technology for optimised swarf control was a feature of this machine, as well as the newly launched Miyano BNA-42GTYLFV — a ‘hybrid’ 42mm-bar capacity moving headstock turn-milling machine that allows the patented LFV technology to be applied to capacities greater than the 20 and 12mm capacities of Citizen’s Cincom sliding-head machines.

This Miyano machine, which uses the Cincom operating system interfaced to the Mitsubishi-based control platform incorporating Citizen’s Superimposition to allow simultaneous cutting with up to three tools, has a three-axis main spindle (X1, Y1 and Z1) rated at 11kW 6,000rev/min, and a two-axis sub-spindle (X3 and Z3) rated at 5.5kW 5,000rev/min.

Also featured are a single eight-station turret with a half-indexing capability, and a gang tool slide with 13 tool positions, of which three can be powered.

The maximum machining length is 110mm and with the option of multi-holders for tools, a maximum of 45 tools can be accommodated.

LFV is controlled by programming special G-codes at the control to impart the ideal size of chip required to offset problems such as the ‘bird-nesting’ of swarf.

These advantages are achieved by ‘vibrating’ the servo axes in the axial direction, while synchronising this vibration with the rotation of the spindle.

The ‘air-cutting’ introduced by this technique is characterised by the ‘intermittent expulsion’ of fine chips, along with the elimination of problems such as chip entanglement and built-up edge.

Be seen in all the right places!

Advanced Engineering UK 2018 Metalex 2018 Indusmach Africa 2018 (Tanzania) Machine Tool Indonesia 2018 Steelfab 2019 Expo Manufactura 2019 TIMTOS 2019 WIN Eurasia 2019 Intermach / MTA 2019 Metaltech 2019 MACH 2020

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