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Πολιτική Ποιότητας

Με το όρο Ποιότητα στην ΠΑΝΤΕΛΗΣ Κ. ΔΟΝΟΥΠΟΓΛΟΥ Α.Ε., εννοείται ότι οι λειτουργίες που αφορούν στο αντικείμενο εργασιών της:

«ΕΜΠΟΡΙΑ ΡΟΥΛΕΜΑΝ ΚΑΙ ΑΛΛΩΝ ΒΙΟΜΗΧΑΝΙΚΩΝ ΕΙΔΩΝ (ΕΡΓΑΛΕΙΑ, ΣΥΣΤΗΜΑΤΑ ΜΕΤΑΔΟΣΗΣ ΚΙΝΗΣΗΣ, κ.α.) – ΕΛΕΓΧΟΣ ΚΑΤΑΣΤΑΣΗΣ ΡΟΥΛΕΜΑΝ»
καλύπτουν πλήρως τις απαιτήσεις των πελατών της, όπως αυτές έχουν τεθεί βάσει συμφωνημένων προδιαγραφών αλλά και τις προδιαγραφές της ίδιας της εταιρείας.

Η διοίκηση ΔΕΣΜΕΥΕΤΑΙ για την Πολιτική Ποιότητας, την οποία και ΔΙΑΔΙΔΕΙ σε όλο το ανθρώπινο δυναμικό της εταιρείας.

 

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Bearings with black oxide finish – Increased performance in critical applications

Category : Νέα

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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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

Category : Νέα

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 40.153 επισκέπτες, 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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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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Remanufacturing bearings

For many medium- to large-size bearings in a number of demanding industries, remanufacturing can offer considerable benefits, including lower life-cycle costs and less unwanted downtime, especially if remanufacturing is combined with other SKF services and technologies. In addition, remanufacturing can support a company’s efforts in the growing importance of sustainability issues.

AUTHOR: FRANCK PELLERIN, CLUSTER MANAGER, CENTER OF EXCELLENCE BEARINGS & UNITS SERVICES, SKF FRANCE, MONTIGNY LE BRETONNEUX, FRANCE

SKF has always recognized the importance of remanufacturing for heavy industries such as metals, mining, mineral processing and cement, pulp and paper, and marine. SKF has a large number of centres around the world that can offer remanufacturing services and is dedicated to expanding with new service centres in the future.

In many applications, bearing service life can be shorter than the calculated rating life. This is because damage to bearings can be caused by such factors as contaminants and sporadic metal-to-metal contact in the rolling contact area.

Summary
Bearing remanufacturing continues to be an important service for many demanding industrial sectors. It can offer considerable operational cost reduction and energy savings in addition to contributing to reduced total life-cycle expenditure, thanks to longer bearing service life and machine uptime.

Bearings suitable for remanufacture (fig. 1) are typically:

large-size bearings with an outside diameter of 420 mm and above, backing bearings, caster bearings, such as spherical roller bearings and CARB bearings, slewing bearings.

Fig. 1: Typical bearings suitable for remanufacture.

The remanufacturing process

Crucially, knowledge of both bearing manufacturing and the specificity of applications in which the bearing is used is important so that the right remanufacturing procedure can be applied. This ensures that the bearing is remanufactured in a manner that is compatible with the application’s requirements.

An extensive analysis of bearing damage is carried out along with careful costing of the remanufacturing. This normally involves visual inspection to determine the type and depth of the damage and measurements that include clearance, ovality, and wall-thickness variation of the rings. Additional non-destructive tests can be carried out, depending on customers’ requests or bearing specifications.

Customers are advised of the work to be carried out before a final order is made.

Besides industrial bearings remanufacturing, SKF offers remanufacturing of bearings for the railway industry (wheel and axlebox bearings), machine tool spindle remanufacturing, gearbox remanufacturing and more.

Fig. 2: SKF’s remanufacturing process.

During remanufacturing, relevant functional surfaces are remanufactured (fig. 3) and bearing components replaced, if necessary. Consequently, the potential service life of the bearing can be extended. Depending on the bearing condition, remanufacturing can take from as little as a few hours to a number of days (fig. 4). Also, depending on the amount of remanufacturing required, as much as 90 percent less energy is needed to remanufacture a bearing compared with making a new one. Taking into consideration the bearing size, complexity, condition and price, substantial cost savings can be achieved by remanufacturing.

SKF applies its latest bearing manufacturing standards, processes, equipment, quality assurance, knowledge and expertise as a foundation for its bearing remanufacturing services and applies it globally. Acceptance criteria are designed to deliver high-quality results whatever the extent of the remanufacturing carried out.

Large-size spherical roller bearing


Fig. 3: Large-size spherical roller bearing: before and after remanufacturing.

As traceability is important, SKF employs an advanced management process to register all the data of each case and applies a unique code to each asset. In this way each bearing can be tracked through its future life cycle. During the process, SKF can also offer remanufacturing to include bearing feature modifications for different or higher specifications. This can include mounting sensors, providing integrated lubrication or offering different sealing and coating solutions. SKF’s remanufacturing process also takes into account the environment through responsible cleaning of used bearings and waste handling.

Prevention of future damage
Having undergone remanufacturing, SKF customers can avoid the recurrence of damage that required the remedial work by exploiting SKF’s predictive maintenance expertise. This provides information about the status of plant machinery through various monitoring services. In addition, SKF offers root-cause failure analysis that identifies those causes and effects that impact on bearing damage and produces a comprehensive plan of corrective action to avoid future problems.

Fig. 4: Remanufacturing costs – Damage severity versus remanufacturability – bearing damage detected at an earlier stage increases remanufacturing possibility and reduces related cost.

For many industrial applications, bearing failure impacts severely on operational costs. SKF has developed solutions to help reduce the total cost of ownership of rotating equipment. The SKF Rotation for Life programme is a long-term, performance-based contract based on a monthly fee. This integrates bearing technology, damage detection, reliability and remanufacturing services, which are part of SKF’s core expertise. Based on the real operating condition of the critical assets, SKF defines key performance indicators. These are used to support a reduction in a company’s total cost of ownership of those assets by offering a single source for components, expertise and services. Savings are made partly through increased machine availability and by cutting capital outlay through optimizing the spare parts inventory and minimizing waste.

In conclusion, SKF can offer substantial benefits to end users including extended bearing service life and reduced machine downtime, resulting in lower total life-cycle costs, and less environmental impact. This is coupled with a maintained stock of replacement bearings and improved overall asset reliability.

CARB is a registered trademark of the SKF Group.
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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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