ADVERTORIAL TECHNOLOGY IN ACTION
Leveraging the advantages of instant adhesives and the latest hybrid innovations Bob Goss, Senior Technology Specialist
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Curtiss-Wright launches EN ISO 13849 compliant Motor Controller
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he C3-CE from Curtiss-Wright’s Industrial division is a new addition to the high- performing, compact and cost-effective C3 motor controller range. It is EN ISO 13849 compliant, compatible with all types of AC induction motors and provides OEMs with a controller that is ideal for small industrial vehicle applications, including Class 3 pallet trucks. The new C3-CE retains all the features and benefits of the original C3 motor controller but has been CE marked as a safety component and designed with EN ISO 13849 Category 3 hardware architecture – including dual microprocessors, dual inputs and a dedicated B+Safe output. This provides a safer and more convenient approach that, unlike the conventional and widely-used Category 2 architecture, doesn’t require the safety function to be checked at ‘machine start-up’ and ‘prior to the initiation of any hazardous situation’, which can be inconvenient and potentially dangerous.
Curtiss-Wright +44 1425 271444
www.cw-industrialgroup.com
ost people are aware of superglue, or cyanoacrylate to give its technical name, but how many know that a whole host of industrial applications can benefit from these advanced adhesives.
The reason behind the growing popularity of
cyanoacrylates in the engineering arena is that they are extremely versatile and easy to use, can perform multi- substrate bonding and deliver fixture times of a few seconds in most applications. In addition, they provide fast assembly solutions for a variety of materials including plastics, elastomers and metals, and cure at room temperature to achieve very high bond strengths – in most cases the substrate will fail before the adhesive joint breaks.
So, how do they work? Well, it should first be noted that the product is kept liquid inside the bottle by an acidic stabiliser. However, when dispensed, the moisture on the surface of the substrate neutralises the stabiliser and cure is initiated. The best results are obtained in atmospheres with about 40-60% humidity. Full cure will still be obtained with less humidity, but a little more time will be required.
Cure in seconds
With a typical bond line thickness of just 0.1mm, cyanoacrylates offer initial cure in seconds. In fact, the joint will achieve about 50% of its total strength within 60 seconds, and 100% in 12-24 hours. Joints set into a rigid thermoplastic with an operating temperature range from - 50°C to +80-90°C, although some offer up to +120°C.
Most engineering plastics can be joined, including ABS, LCP (liquid crystal polymer), PBT, polycarbonate, PMMA (acrylic), nylon (polyamide) and polysulfone, as well as nitrile, butyl and neoprene rubbers. Cyanoacrylates are also suitable for wood, leather, fabrics, steel and aluminium.
Henkel Loctite 01442 278100
www.loctite.co.uk
With the objective of increasing the reliability, availability and efficiency of wind turbines, Schaeffler has optimised its spherical roller bearings for the main rotor. The development of an asymmetrical spherical roller bearing represents yet another step towards increased robustness.
Robust spherical roller bearings make wind energy more efficient T
he rotor shaft bearings are of critical importance in wind turbines. The locating bearing is subject to extremely high axial loads. With this in mind, Schaeffler has optimised its tried and tested standard spherical roller bearings in order to meet the specific requirements of wind turbines. In addition, Schaeffler has developed an asymmetrical bearing design.
Robust design for reduced wear With regard to micro-geometry, developers have improved the surfaces in order to reduce friction and thus the application of energy and wear. In addition, they have adjusted osculation to transmit rolling element normal forces across a large surface, reducing contact pressure. The rolling elements have also been specially profiled. Adjustments in macro-geometry primarily comprise two aspects. First, the engineers have reduced the internal bearing clearance, which has improved the operating clearance. This has also reduced the rolling bearing forces and the axial sliding of the drive train. Second, they have used a firm centre rib for the locating bearings of the wind turbine rotor and increased axial rigidity, which reduced the axial displacement of the drive train. In addition, the firm centre rib helps to distribute the contact pressures along the rollers. With these two measures, it has been possible to increase the robustness of the bearings against wear, which is caused by axial displacement. As part of validation, the bearings were subjected to comprehensive testing and granted Schaeffler’s “X-life” seal of approval. The necessary validation steps have been certified by Germanischer Lloyd (certificate GL-CER-002-2015).
Better load distribution with asymmetrical spherical roller bearings The asymmetrical bearing design represents yet another major step forward. This design significantly increases the axial load carrying capacity and therefore the service life of the main bearings in wind turbines. It allows a greater contact angle on the row of rollers supporting the axial load and a flatter contact angle on the row of rollers that primarily support radial loads. This results in better load distribution, reduced contact pressures and a significant reduction of the axial sliding distance.
The asymmetrical spherical roller bearing significantly increases the axial load carrying capacity and thus the service life of the main bearings in wind turbines.
S1 NOVEMBER/DECEMBER 2016 | MATERIALS HANDLING & LOGISTICS 0 Shaeffler UK 0121 313 5884
www.schaeffler.co.uk
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