Factory focus Seals & bearings Adhesives seal the deal for specialist stove manufacturer
La Cornue, specialist in domestic stoves with a list of rich and famous customers is using Loctite to seal gas fittings and lock- ing threaded assemblies with reliability. The company uses several Loctite engi- neering adhesives in the process. “What we expect from these products is absolute reli- ability, especially for the gas fittings,” explains Alain Savignat, production manag- er at La Cornue. “But Henkel provides more than just products. The company helps us develop new processes for the future too.” Every year, La Cornue seals around 400
metres of pipes and 1,600 connections. For assembling and sealing the gas con-
nections it uses Loctite 577, a liquid medium strength pipe-thread sealant. It reliably prevents connections from work- ing themselves loose and stops any leakages caused by vibrations or impact. It also allows fine adjustments to be made during assembly before curing in anaero- bic conditions.
This single component product is clean and easy to apply and does not creep, shrink or block systems. Loctite 577 has DVGW approval and can be used on pipe fittings up to three inches. It provides many performance benefits over solvent- based sealing compounds that shrink dur-
ing cure and PTFE tape whose lubricants allow fittings to loosen. Another product that is widely employed
at La Cornue is the Loctite 243 thread lock- er. The elegant enamel surfaces that are a feature of the stoves are prone to damage if a screw or other component is over-ten- sioned. This proven Loctite product allows careful assembly and a secure fastening. Loctite thread locking and thread sealing adhesives are used across industry and available in multiple variants to suit the task. The needs of many of these applications can now also be met by the new Health and Safety options within both ranges.
Hybrid bearings prevent premature failures
A new angular contact ball bear- ing has been developed that pre- vents the premature failure of ball screws in short stroke applica- tions, particularly those that occur due to false brinelling. This occurs when the separat- ing lubricant film between the rolling elements and raceways is no longer present, for example, due to a lack of relative motion between the rolling partners or where the pivot angle is very small. This leads to localised fret- ting corrosion where the unpro- tected steel-to-steel contact point starts to corrode. Vibrations cause the corroded parts to detach as they are formed and become
Bearings take on
mission to Mars The Curiosity rover that landed on Mars in early August uses Kaydon Reali-Slim thin section bearings for a range of tasks. These components are said to save space and weight without compromis- ing performance. Kaydon’s UK representative R. A. Rodriguez, supplies Reali-Slim bearings to the aerospace and defence sectors for a variety of mis- sion critical applications. The five pairs of duplexed bearings specified for Curiosity operate in two areas: a mech- anism for preparing rock material samples for analysis and supporting the steering actuators for the rover’s wheels. The rover was designed, developed and assembled by the Jet Propulsion Laboratory and its engineers decided early on that thin section bearings were the best way to handle the load in the small space available and effectively built the remaining design around them. R. A Rodriguez T: 01462 670044
rarodriguez.co.uk Enter 305 12
custom rubber seals and mould- ings, is supplying Hypertac, sup- plier of high performance interconnect solutions, with interfacial seals for its high-den- sity PCB connectors.
Ensuring the accuracy and pre- cision demanded by these fluo- rosilicone seals – used in challenging applications such as aerospace and defence, mass transit and marine – set DP Seals one of its toughest tooling tests. Hypertac’s PCB connectors use 0.6mm pins in multiple rows on a 0.953mm staggered pitch, dimensions the tool needed to match accurately whilst adding detail essential in ensuring a tight seal against dirt, oil and other liquids; the seal itself is just 3mm thick. DP Seals fabricated a set of tools where each individ-
ual connector pin is represented by a custom-designed 0.7mm minimum diameter tool steel pin, held in place with a M0.6 coun- tersunk screw just 2.5mm long. “Hypertac gave us one of our most demanding tooling tests for many years,” notes Russell Willis, DP Seals’ tool room man- ager. “We even had to manufac- ture our own Philips screwdrivers for the job.” DP Seals T: 01202 674 671
www.dpseals.com Enter 306
embedded in the lubricating grease. Over time, the rolling ele- ments fuse to the raceway, which leads to bearing failure. Schaeffler’s new ZKLF..-HC hybrid angular contact thrust ball bearings provide a suitable solu- tion. The bearings use ceramic rolling elements, so there is no possibility of metal-to-metal con- tact. Also, the limiting speed is increased and there is a threefold increase in grease operating life.
Up to now, hybrid bearings have not been used for short stroke ball screw applications, as their basic load rating is around 30 per cent lower than that of corresponding standard bearings. However, field use of hybrid bear- ings has shown that the life ratings achieved are at least comparable with those of conven- tional standard bearings. As a result, the DIN standards working groups have decided to withdraw the theoretical reduc- tion of the dynamic basic load ratings. In terms of lifecycle costs, this means there is now nothing to oppose the use of hybrid bear- ings for ball screw applications. Schaeffler UK T: 0121 3135870
www.schaeffler.co.uk Enter 304
PCB seals present tough challenge DP Seals, supplier of precision
The Loctite 2400 and 2700 thread locking adhesives and the Loctite 5400 thread sealant are free from all hazard labelling. Loctite T: 01442 278100
www.loctite.co.uk Enter 303
Pump bearing
design optimised NSK’s recently introduced range of high performance angular contact bearings for industrial pumps has an optimised internal design that con- tributes significantly to lower running costs, allows downscaling of compo- nents, and saves energy by extending maintenance intervals. The optimised design is said to deliver up to 50 per cent more bearing life compared to standard angular contact bearings, and an improvement in basic dynamic load rating of approximately 13 per cent. The new design of the high perfor- mance angular contact bearings has optimised all key areas of the bearing construction. Basic dynamic load has been improved by approximately 13 per cent, by reviewing ball diameter and optimising the internal design of the bearing rings and cage. As a result, bearing life has been extended by approximately 50 per cent in comparison with standard angular contact bearings. By improving the shape and guiding method of the copper alloy cage, the space between the rings and cage has been optimised, resulting in improved properties of inflow and discharge of lubricant through the bearings. The result of this improvement in key areas of the bearings is improved reliability, with commensurate operating benefits for the pump user. NSK
T: 0500 2327464
www.nskeurope.com Enter 307
NOVEMBER/DECEMBER 2012 Factory Equipment
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