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Graham Rowlands
SigmaTEK Europe Ltd
Tel: +44 (0) 2476 323065
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Features

Aerospace
Special Asie

26 May 2009  -  United Kingdom

SigmaNEST saves Prodrive £70,000 in composite manufacture

Prodrive is well known for its association with motorsport, running race and rallying programmes for some of the biggest names including Subaru, Aston Martin and Ford. Its Composites Division in Milton Keynes specialises in the manufacture of high quality carbon fibre components for its own race and rally programmes and businesses in the automotive, marine and aerospace industries.

CAD models are first machined into an epoxy blank pattern and then a carbon fibre mould tool produced, which can make between 100 and 300 finished parts. Ian Handscombe, Composites Manager, explains the process, “We cut the resin impregnated carbon fibre and lay this up on the pattern to produce a mould about 6mm thick, which we cure overnight in our autoclave. Making the mould from carbon fibre ensures that it expands and contracts at the same rate as the part, guaranteeing accuracy. Components are also made from impregnated carbon fibre and are laid up in the mould to thicknesses ranging between 1 and 12mm, with the thicker components including a honeycomb core. These are cured in the autoclave at 130ºC and 90 PSI.”

Considerable amounts of carbon fibre are used in the production process, so maximising utilisation is extremely important for the company. Ian Handscombe adds, “Carbon fibre costs between £15 and £40 per sq metre so avoiding wastage is a high priority. Initially, wastage rates were around 40%, but the introduction of SigmaNEST from SigmaTEK has halved these figures, enabling us to save around £70,000 per year.” The company tested several nesting systems before selecting SigmaNEST, which reduced the material used in a sample nest from six sheets to four, significantly better than the other products it evaluated.

As well as improving material utilisation, the software has also helped Prodrive to provide its customers with improved service. Two day lead times are normal in the industry, so being able to respond in a rapid and orderly way is crucial to the effective running of the business. Ian Handscombe continues, “ We have put a lot of effort into streamlining our administration and working methods. Previously, laminators were frequently waiting for moulds and carbon fibre kits, which stopped them from working and encouraged inefficient practices and further material wastage. Now, with the fast and efficient nesting in SigmaNEST, carbon fibre kits are planned and cut one and a half days in advance, and the reorganisation ensures that moulds and instructions are ready in plenty of time. Laminators are able to start work immediately, making much better use of their time and greatly improving our overall productivity.”

The introduction of SigmaNEST has enabled the company to look at every aspect of its composites operation. The new smooth running process has created extra capacity so that, as well as improving the profitability of existing work, Prodrive has been able to attract additional business which has further justified its investment in the software. Ian Handscombe says, “SigmaNEST paid for itself in three months and is hugely important to our company. It has been the main driver for our improvement program and complete review of methods. We could not have achieved the increase in turnover without it. We still have many changes to make, investing in new machinery and software, and SigmaTEK will be playing a key role here too. We are working towards operating 24 hours per day and we are anticipating expanding into other markets including aerospace, defence, telecommunications and marine where the flexibility, low weight and strength of carbon fibre is important.”

About the SigmaTEK Corporation
Formed in 1992, with offices in Cincinnati, Ohio, Seattle, Washington; international offices in Europe, Japan and Australia, and a worldwide distribution network, over 4000 SigmaNEST® systems are now in use round the globe. SigmaNEST® software maintains its technological leadership in sheet metal nesting and cutting by a relentless commitment to research and development, providing customers with tools to maximise material utilisation and increase machine throughput while minimising programming time and effort. Authorised training centres around the world provide after sales technical support and education to optimise productivity for users.

Source : SigmaTEK Europe