When an industrial composite products manufacturer needed to improve the functional performance of their outdoor luminaires which are used on marine platforms and oil rigs, they turned to bigHead Bonding Fasteners for a solution and produced additional production cost savings.
A sheet moulded compound (SMC) housing forms the upper and supporting part of the IP-rated luminaire which is designed for top-access mounting. The original moulded component formed a sealed cover with two female threaded metal fastening inserts. By necessity, the inserts were fitted after the SMC moulding process, requiring a secondary operation for drilling holes and for bonding/sealing the inserts.
As well as adding several minutes production time and requiring an extra person to carry out the work, the secondary operation also necessitated inspection of the sealing seat area - and the possibility of expensive product function failure in the field when, over time, the seal performance degraded and water ingress occurred.
The customer contacted bigHead when its design engineers began to investigate a solution to the functional performance problems. The solution was to embed bigHeads into the SMC material during the mould process with a completely sealed one-piece upper housing guaranteeing its resilience to water ingress for the long term.
On first investigation it was clear that a standard bigHead fastener might be difficult to directly set into the existing and costly SMC mould tool without significant tool rework. There was also a further challenge as to how the two bigHeads could be locked in position during the mould process but easily removed.
However, bigHead’s engineering team designed a bigHead to provide a secure fixing point that is fully embedded within the SMC material. As part of its engineering service bigHead also improved the production process by providing a retention tool that could be cost-effectively fitted into the existing mould tool. This retention tool precisely and securely holds the bigHeads in position during the SMC mould cycle, and allows straightforward component removal and reloading. And importantly, by removing the need for any secondary drilling and sealing operations, production time and cost savings were achieved.
