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Low cost sensors have high impact on productivity

14 March 2019 • In Features
Low cost sensors have high impact on productivity

The prototype installed on the AMRC’s DMG Mori NT5400 DCG 5-axis turning centre

An intelligent, low-cost tooling insert, embedded with smart sensors, has been developed to deliver in-process condition monitoring that reduces machining stoppages and improves productivity for UK manufacturers.

The prototype device, developed with Innovate UK funding, allows a machine tool operator to determine the condition of a cutting tool without manual inspection and is the first ‘plug and play’ system of its kind with no process learning time required on installation.

“Currently, the task of monitoring the wear on the tool cutting edges is carried out by an operator who inspects the cutting tool using a laser or touch probe system; thus causing stoppages of machine tools which results in poor productivity and potentially higher costs,” said AMRC machining group technical lead for control systems, sensors and data acquisition, Hatim Laalej who has been working on the development of the device.  “These are real concerns for manufacturers as stoppage costs in production can be high.

“Manual inspection also varies according to the skills and experience of the operator monitoring the tool wear,” he adds. “When tools are not changed at the right time, damage can be caused to a workpiece, leading to increased costs due to scrappages and rework. Equally, if tools are changed before the end of their useful life this can increase consumable costs.

“The cost of the system is relatively low as it involves using low-cost electronics. The device has been designed to be accessible to small and medium sized companies who are looking for ways to improve the efficiency, performance and quality of their operations, which is vital to improving the productivity of the wider UK economy.”

Monitoring tool wear during machining processes is essential to achieve the desired accuracy and surface finish of a workpiece. The tooling insert is embedded with sensors which produces data about the current condition of the cutting tool. This data is converted and sent wirelessly to the machine panel or a machine operator’s control pad for them to make a decision about the condition of the cutting tool, whilst machining is in-process.

“The sensor monitors the resistance generated within the tool embedded sensor, so if its resistance increases this indicates tool wear, chipping or breakage.” Mr Laalei explains. “This means errors can be recorded and operators can move to preventative maintenance planning to free up valuable time on the shopfloor when operators could utilise extra capabilities increasing productivity.”

AMRC Machining Group technical lead for control Systems, sensors and data acquisition, Hatim Laalej

AMRC Machining Group technical lead for control Systems, sensors and data acquisition, Hatim Laalej

The AMRC Machining Group successfully installed the prototype on its DMG Mori NT5400 DCG 5-axis turning machine, to trial cutting operations and validate its capabilities.

The cutting operations were simulated before trialling the prototype on the DMG, where polycrystalline diamond and polycrystalline cubic boron nitride cutting inserts with embedded sensors were used to machine titanium Ti-6AI-4V and Inconel 718 bars respectively.

But Mr Laalei isn’t resting on his laurels. His goal is to eliminate tool wear, machine downtime and eventually tool breakage altogether: “Further development of the technology will look at extending the process for various milling processes as well as turning and adapt the system to send diagnosis and data to a portable device, such as a laptop, so an operator can be working remotely to the machine.”

The Innovate UK project was a collaboration between fellow High Value Manufacturing Catapult partner CPI, alongside Element Six, Advanced Manufacturing (Sheffield) Limited, BAE Systems, Printed Electronics, National Physical Laboratory and DMG Mori UK and the resulting prototype device is now ready to be scaled up into an industry-ready solution.

The AMRC is keen for partners, especially toolholding manufacturers who might be interested in developing the prototype as a commercially available product, as the new system will have massive benefits for machinists in all manufacturing sectors.

AMRC
www.amrc.co.uk

Michael Tyrrell

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Michael Tyrrell
Digital Coordinator

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AMRC Tooling

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