Category Archives: Ανακοινώσεις

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Bearings with black oxide finish – Increased performance in critical applications

At this year’s Hannover Messe in Germany, bearing manufacturer NKE Austria GmbH presents bearings with black oxide finish. The protective layer improves run-in and wear characteristics and protects against environmental effects. Especially in critical applications such as wind turbine gear boxes, black oxide finish is a cost-effective and technically viable means of prolonging the service life and performance of rolling bearings.

The black oxide finish forms a protective layer for steel parts. In a multistage chemical process, the surface layer of the treated parts is converted into a 1 to 2 micrometer thin mixed ferrous oxide layer that causes the characteristic black appearance. Black oxide finished bearing components feature a set of special technical characteristics, especially in the case of components that move relative to each other. Multiple protective effects can be achieved if only one functional element (typically the rolling elements) is treated. For best effect, however, all functional surfaces of a rolling element bearing, including the inner and outer ring as well as the rolling elements, should be black oxide finished.

Black oxide finishing is already an established method in other industries. NKE uses this technology to further improve the technical properties of rolling bearings. The method has proven itself in practice especially with full complement cylindrical roller bearings, but other types of rolling bearing are also black oxide finished, depending on the application. NKE offers a large number of black oxide finished rolling bearings. At NKE, this finish is used especially for cylindrical roller bearings, which then carry the suffix SQ94. The most common variants are SQ94B (rolling elements black oxide finished) and SQ94-D (all bearing components except for the cage black oxide finished).

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Η Παντελής Κ. Δονούπογλου AE στην 2η Πανελλήνια Έκθεση για τη Γεωργία και τη Κτηνοτροφία Agrothessaly

Νέα δεδομένα για την γεωργία και την κτηνοτροφία διαμορφώνει η 12η Πανελλήνια Έκθεση για τη Γεωργία και τη Κτηνοτροφία Agrothessaly, η οποία πραγματοποιείται από τις 28 Φεβρουαρίου-3 Μαρτίου 2019 στην Σκεπαστή Αγορά της Νεάπολης Λάρισας.

Η Agrothessaly αποτελεί μία στρατηγική συνεργασία της ΔΕΘ-Helexpo και του Δήμου Λαρισαίων και στην περσινή διοργάνωση της προσέλκυσε 40.153επισκέπτες, μέγεθος τετραπλάσιο σε σχέση με την προηγούμενη έκθεση.

Η Agrothessaly έχει διεθνή χαρακτήρα, καθώς πέρσι υποδέχθηκε ομαδικές επισκέψεις από τη Βουλγαρία, την ΠΓΔΜ, την Αλβανία και την Τουρκία, αλλά και επισκέπτες από Κύπρο και Ιταλία.

Μεγάλο είναι το ενδιαφέρον και για τις παράλληλες εκδηλώσεις της έκθεσης, που καλύπτουν ένα ευρύ πεδίο του αγροτικού κλάδου και συγκεντρώνουν πλήθος κόσμου, που ενημερώνεται από φορείς του πρωτογενούς τομέα, αλλά και από εκπαιδευτικά ιδρύματα, όπως το Πανεπιστήμιο Θεσσαλίας και το ΤΕΙ Θεσσαλίας.

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SKF showcases new products at SMM 2018

At the SMM2018 trade fair (Hamburg, 4-7 September), SKF will showcase a range of new products that help owners and operators comply with present and future environmental regulations, as well as help them improve maintenance processes and performance. The new products include environmental-friendly shaft line and condition-monitoring solutions.

Gothenburg, Sweden, 20 June 2018: SKF will launch four new products at the SMM show while showcasing a wide range of its latest offerings for the maritime sector.

The first new launch at SMM is SKF’s new environmental-friendly shaft line solution – Simplex BlueRun. This range of water-lubricated sterntube solutions includes Simplex BlueRun bearings, carrier bushes as well as the Simplex BlueRun tail shaft monitoring system.

Also on show will be SKF’s EcoMode. This software has been developed to ensure optimised fin stabiliser operation and it delivers recommendations and actions based on retrospective movement analysis.

In addition for the optimisation of oily water treatment processing onboard any kind of vessels SKF has developed two new products. The new products include the Turbulo SolidMaster, a filtration unit that precedes an oily water separator and mechanically removes suspended solids in the bilge water. Also on stand will be the new Turbulo HycaLogger, an electronic tool/log book to log raw data of the oily water separator i.e. all oil discharges from the oily water separator.

Alongside the wide range of marine solution exhibits, SKF will also have the product developers and marine experts available throughout the show, so that visitors can discuss how the solutions could relate to their specific application needs.

See SKF at SMM 2018: Hall A1, stand 210

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Tool case solution for fretting corrosion protection

The SKF anti-fretting paste LGAF 3E is a well-proven mounting paste that helps to reduce fretting corrosion in metal to metal contact areas that are subject to vibrations or small relative movements.
The new 35 gram tube is designed to be readily available in every tool case for mounting bearings or protecting other metal to metal contact areas from fretting corrosion. Since only little amounts are needed for effective protection, the 35 gram tube is sufficient for many installations. More than 25 installations of 23120 CC/W33 can be performed with a single tube.

LGAF 3E 35 grams tube box

  • Effective protections against fretting corrosion
  • Small pack size for tool cases
  • High economics in application
  • Recommended for all bearing installations
  • Usable for many other applications

 

 

 

Typical applications

  • Bearing mounting

The most common usage of LGAF 3E is for mounting bearings. Applying the anti-fretting paste in the loose fit between the bearing and the housing (or shaft) significantly reduces fretting corrosion and helps to increase the service life of the bearing, shaft and housing. LGAF 3E reduces fretting corrosion in the loose fit of bearings.
Less corrosion makes bearing dismounting easier. Reducing corrosion repair work helps to maintain a good bearing fit.

  • Heater maintenance

The contact area between the TIH heater core and the yokes needs regular maintenance to ensure long term performance. Cleaning the contact area and applying LGAF 3E help to
reduce corrosion of the contact surface in between core and yoke,
reduce noise of the heater in operation and
maintain high heater performance over time.

  • VIBRACON re-installation

SKF VIBRACON chocks are delivered with protective layer of LGAF 3E and are ready for use. After equipment re-installations where the spherical surfaces were separated and cleaned, a thin layer of LGAF 3E needs to be applied to prevent fretting corrosion and keep the chock in a good condition.

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Cooper Roller Bearings becomes SKF Cooper Split Bearings

Now an established brand within the SKF Group, Cooper Roller Bearings product ranges will henceforth be marketed as ‘SKF Cooper split bearings’.

Gothenburg, Sweden, 15 January 2018: SKF acquired Cooper Roller Bearings Co Ltd in 2013 as part of the US based Kaydon Corporation, Cooper’s parent company at the time. Following a period of consolidation within the SKF, it has now been decided that all Cooper Split Bearings ranges will be marketed under the name of SKF Cooper going forward.

SKF Cooper products will continue to complement the growing SKF portfolio of complete solutions for the marine, mining, quarrying, construction and energy sectors. In addition to the brand name change, the channels to market for SKF Cooper products, including responses to customer enquiries, product supply and after-sales support, will be handled on a global basis through local SKF sales outlets going forward.

SKF Cooper split roller bearings can be fitted, removed and inspected without having to dismantle surrounding equipment, providing savings in terms of reduced maintenance and downtime. The products include both split cylindrical roller bearings and split double row tapered roller bearings, the latter with the ability to take axial loads in either direction. Both are housed and sealed in special swivel cartridges, which are suitable for mounting in pedestal or flanged outer housings.

The cartridges have a spherical outer surface that fits into a conforming surface in the mounting unit rather like a ball and socket joint; any shaft misalignment tends to move the cartridge, seal and bearing together, maintaining the seal on an axis parallel to the shaft. This configuration allows extremely close tolerances to be maintained between the housing and the shaft, delivering a sealing performance that is recognised as one of the best in the anti-friction bearing industry.

As well as their complementary product ranges and reputations for engineering excellence, Cooper and SKF have one other thing in common: both mark 1907 as a particularly momentous year in their respective histories. 1907 was the year that Cooper’s founder, Thomas Cooper patented the world’s first split rolling element bearing, and in that same year Sven Wingquist invented the first self-aligning bearings and founded the Svenska Kullagerfabriken company – nowadays more commonly known as SKF.

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SKF delivers its largest sealed spherical roller bearing

SKF’s Gothenburg factory has produced the company’s largest sealed spherical roller bearing (SRB) to date. The ‘241/900’ SRB is 50 per cent larger and three times heavier than the previous largest SKF sealed SRB.

Gothenburg, Sweden, 4 October 2017: Destined for a Polysius Polycom 8 roller press at a large copper mine in Peru, the three-tonne 241/900 sealed SRB is dimensionally equivalent to a standard SKF non-sealed version, with inner diameter (bore) of 900mm, outer diameter of 1,420mm and width of 515mm. The seal itself consists of a rubber over-moulded steel plate with the same profile and offering the same characteristics as those currently used with existing SKF sealed SRBs.

The customer’s sealed SRB will be fitted to a horizontal shaft and will operate in extremely dusty conditions, with very fine stone dust from both the desert location itself and the grinding processes posing a major contamination risk. The roller press is a highly loaded application (C/P of 2-3) subject to frequent shock loading; the predominantly radial loads, when coupled with the high level of contamination at the site, poses a significant risk of early bearing failure. SKF’s custom made seal aims to at least double the bearing service life by reducing the risk of contamination in this application significantly.

The actual performance of the seal for this size of SRB remains to be verified in service by the customer, but the same seal design used in smaller SRB sizes has achieved a service life of at least double that of an open, non-sealed bearing. Even longer service lives of around three to five times that of a non-sealed bearing can be achieved with SKF’s ‘Three-Barrier’ bearing protection solution, which comprises premium SKF sealed SRBs housed within sealed housings containing a barrier grease.

This record-breaking sealed SRB was designed and manufactured within a tight, six-month schedule by a team led by Daniel Ortega – Project Manager, Business Development.

 

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Επέκταση γκάμας προϊόντων SKF

Το τελευταίο τρίμηνο η SKF παρουσίασε 54 νέα σετ, βελτιώνοντας έτσι ακόμη περισσότερο την κάλυψή της σε όλες τις γραμμές προϊόντων της.

  • 9 Σετ ρουλεμάν τροχού
  • 4 Σετ χρονισμού
  • 23 Σετ δυναμό
  • 8 Σετ μετάδοσης κίνησης
  • 8 σετ ανάρτησης
  • 1 Σετ ρουλεμάν συμπλέκτη
  • 1 Σετ κιβωτίου ταχυτήτων

Κάντε κλικ εδώ για να δείτε την πλήρη λίστα των νέων σετ.

Μπορείτε να βρείτε τις αναλυτικές εφαρμογές καθώς και περισσότερες πληροφορίες για τα νέα σετ αλλά και ολόκληρη τη γκάμα προϊόντων μας στον ηλεκτρονικό κατάλογο: http://webshop-cs.tecdoc.net/skf/?

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Assured quality from approved service suppliers

Setting new standards

Assured quality from approved service suppliers

For centuries, classification societies have helped shape standards and regulations to improve the safety of ships. Vessels that live up to these requirements receive approval. Thomas Knödlseder, senior engineer at DNV GL Maritime, explains how classification societies ensure the quality of services suppliers.

Thomas Knödlseder: With ships and offshore structures, it is especially important that certain levels of quality and reliability are achieved. At DNV GL, our purpose is to safeguard life, property, and the environment. As a classification society, we check and approve the design, materials, and components of newly built vessels and carry out periodic inspections on ships in operation to verify that standards continue to be met. If they fulfill our requirements, they receive the classification certificate, which is typically valid for five years.

In recent years, the maritime industry has undergone significant change. Has this had an impact on your approval process?

Of course. We always have to adapt our rules and regulations to reflect changing practices and advances in technology. For example, as more and more ship operators implement CBM (condition-based maintenance) strategies, we need to make sure that our rules enable this method of verifying machinery condition. However, first we must make sure that it is done correctly.

Our purpose is, and always has been, to safeguard life, property, and the environment.”
Thomas Knödlseder, Senior Engineer, DNV GL – Maritime

So how does DNV GL go about doing this?

We have to ensure that the condition monitoring (CM) systems deliver accurate information. If, for example, the systems are not monitoring correctly, the crew on board a vessel might draw false conclusions from the data. This could jeopardize the reliability of a ship. For this reason, we check that the service suppliers live up to certain standards before they are permitted to work with DNV GL approved vessels.

What are the main things you look out for when assessing service suppliers?

First of all, the service supplier has to be able to carry out its services at a consistently high standard of quality. We verify that CM systems are installed properly, that they are collecting the right amount of information to form an accurate picture, and that the data is analyzed by qualified, skilled personnel. In addition, we demand that service suppliers have a continuous improvement program in place, including training. If they can meet all of these conditions, they receive certification that is valid for three years.

What does this mean for ship operators? Why should they choose approved service suppliers?

Ultimately, our services help establish mutual trust between shipping companies, operators, and suppliers. When a ship operator works with a DNV GL approved service supplier, they can rest assured knowing we have checked and verified everything in great detail, so they can rely on the information from their CM systems. And for certain applications, having properly implemented CM systems means we will remove the standard survey intervals of five years and even maker’s recommendations for periodic maintenance.

On the other hand, the service suppliers themselves also benefit from approval. During the process, we provide them with guidance on how to comply with the requirements. We’ve seen suppliers that have identified room for improvement after taking another look at their own processes and the way they deliver services. As a result, they can actually enhance the quality of their services during the process.

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SKF inaugurates large-size bearing test centre

SKF has inaugurated its newly-built Sven Wingquist Test Center in Schweinfurt, Germany, an investment totalling EUR 40 million. The center is the first in the world that is able to test large-size bearings under actual operating conditions. This allows for a more efficient development process for customers, as well as improved bearing performance and increased service life.

The Sven Wingquist Test Center has two testing rigs. One rig is designed for the testing of wind turbine main shaft arrangements. The second rig will be used for testing bearings used in other industrial sectors, including mining, construction, steel manufacturing and marine transport.
Combined with SKF’s continued development of diagnostics, condition monitoring and simulation methods, these rigs will contribute to reduced testing and product development lead-times and provide deeper insights into bearing performance.

Victoria Van Camp, CTO and President, Innovation and Business Development, says: “No other test center is capable of testing large-size bearings this accurately, under actual operating conditions, giving us and our customers a significant strategic advantage. The technologies being used here in the Sven Wingquist Test Center will help save our customers time and resources, whilst supporting their ambitions of increased reliability and service life.”

The test centre has received funding from the Bavarian Ministry of Economic Affairs, Media, Energy and Technology and the German Federal Ministry for the Environment, Nature Conservation, Construction and Reactor Safety.

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