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1 SpecialtyFasteners UPDATE Looking for high strength threads in low strength materials? USE KEENSERTS BY INTERNAL THREAD (Metric or Imperial) LOCKING KEES (Provides lock when driven down) STANDARD EXTERNAL THREAD (Metric or Imperial) Prepare tapped holes. Screw the Keensert until the kees contact the surface 2 ® traditionally innovative Drive kees into the parent material securely locking the Keensert in place SPECIALTY FASTENERS & COMPONENTS LTD Totnes, Devon TQ9 5AL Tel: 01803 868677 Email: sales@specialty-fasteners.co.uk F E A T U R E S • Standard tap sizes • Standard drill sizes • No special installation tools • No Tangs to break off • Keensert positively locked in place • Metric and Imperial sizes • Kits available 3 Keensert is now locked in and ready for use SEE MORE SOLUTIONS TO YOUR FASTENING PROBLEMS AT www.specialty-fasteners.co.uk
Advanced fastener design for plastic applications For many years now inserts used in plastics have traditionally be manufactured from brass because of its combination of free machining characteristics, thermal conductivity and corrosion resistance. However, the cost of brass has escalated in the last two years to its highest ever recorded now making it very prohibitive. This has been the catalyst for PSM to address the situation and has resulted in them designing an insert made from aluminium. By the selection of aluminium, it not only offers the benefit of low cost of inserts compared to brass but it also has weight and process improvements advantages. Many tests have been carried out to ensure that the type of aluminium used for the PSM Tri-step insert offers similar performance requirements to the brass inserts that are currently in use today. With regard to weight improvements, aluminium is some 60% lighter than brass material. This helps designers significantly in meeting weight reduction targets that most companies are looking to achieve in the current economic climate. From a process point of view where inserts are installed by heat or ultrasonic methods, the aluminium Tri-step insert has 40% better thermal conductivity compared to brass or steel. This reduces the heating preparation time prior to installation of the insert and cools more rapidly once installed. Better production efficiencies and lower use of power to install the insert all add to in-place cost improvements. Further performance improvements have been made by the geometry of the insert and hole combination. The Tri-step insert has three diameters reducing from the top face of the insert to the leading edge at the bottom of the insert. This corresponds with three stepped holes in the plastic moulding that accommodate each diameter of the insert. The first advantage is that because the smallest diameter of the insert enters the largest of the stepped holes in the plastic moulding ensures excellent positioning and alignment of the insert in the hole. The second advan- FAST OCTOBER 2011 PRODUCT REVIEW: ALUMINIUM INSERTS The high cost of brass used for special inserts in plastics components has led to the development of an aluminium alternative tage is that the insert enters the hole by 66% of its length before it meets resistance making the installation faster than other types of insert by some 30%. The saving on the process can easily be calculated to add to the in-place cost savings. The design of the insert and hole ensure that the minimum amount of pressure is applied when installing the insert, resulting in extremely low levels of stress being transferred to the plastic material. This combined with the stepped parallel insert design results in the elimination of spring back, a condition where the insert can move out of the hole to some degree before the plastic material has the chance to cool sufficiently. This can occur if pressure is not applied for a short time after the insert is fully installed. The Aluminium Tri-Step insert will be showcased by PSM at the upcoming FAST exhibition in October. PSM INTERNATIONAL 01902 407370 Three stepped aluminium inset and hole design Left: Location has 0.6mm clearance between hole and vanes Centre: Insert free fits into hole for more than two thirds of its length Right: 3.1mm of insert travel to install an M6 insert fully 39
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