As a result of pillow block bearings that were failing every six weeks on the multiple-belt dough-prove section of a process line, a UK-based tortilla wrap manufacturer turned to NSK for help. Investigations by NSK´s expert engineering team attributed the failures to the ingress of flour particulates and set-screw loosening (shaft creep) due to vibration. A recommendation was subsequently made to replace the tortilla wrap manufacturer´s standard pillow block units with Self-Lube Triple-Lip Sealed Units and eccentric locking collars from NSK. The replacement bearing units have successfully extended operating life from six weeks to over one year, resulting in significant cost savings. Flour particulates can be extremely damaging to incorrectly specified bearings on dough-prove belt conveyors
The dough prove at the tortilla wrap manufacturing plant has 42 rollers in total, which prior to the NSK recommendation were each supported by two pillow-block bearing units with a single lip seal and set screw locking arrangement. Rotation speed is around 120-rpm. A belt is wrapped around the rollers to convey the tortilla wraps and retain them for long enough to prove. The tortilla wraps travel from one end of the dough prove, flip over on to the belt below, and travel in the other direction. This sequence is repeated until they enter the oven for baking. Dough-prove conveyors operate in harsh conditions where they are exposed to flour particulates and metallic debris from chain and sprocket wear (a number of rollers on dough-prove conveyors are typically driven by sprockets and chain). For the tortilla wrap manufacturer, this operating environment meant that two mounted bearing units and one 35mm diameter shaft required replacement approximately every six weeks. The bearings were reported as damaged beyond use due to heavy contamination and creep damage to the bore, while the roller had to be replaced due to an undersized shaft diameter at the bearing fitting surface (from wear damage caused by creep). Every failure would require a significant number of man hours to perform the replacement, and bring about substantial machine downtime and costly production losses. In contrast, the introduction of NSK Self-Lube Triple-Lip Sealed Units has produced zero failures over a 12-month period. These bearing units feature a nitrile rubber triple lip that is bonded to a protective pressed-steel shield. As a result, longer bearing life is achieved through superior seal performance. Additionally, the bearing units provide extended re-lubrication intervals, which in turn greatly reduces maintenance costs and increases the productivity of machinery and equipment. In total, the annual savings at the tortilla wrap manufacturer have been calculated at €54,665. Self-Lube Triple-Lip Sealed Units offer simple implementation and represent a ready replacement for existing bearing units. They are available for both set-screw and eccentric locking collar insert options, in metric and imperial bore sizes. Importantly for the application at the tortilla wrap manufacturer, the selection of eccentric locking collars successfully reduced insert loosening in service, without damaging the shaft.
NSK launches J-Line – a new range of JIS standard bearing units
NSK is expanding its existing RHP branded Self-Lube® range of bearing units to include products made to the JIS standard. With this new J-Line series, NSK also introduces a new packaging design.
The J-Line bearing units comprise six of the most popular housing types: pillow block with/without feet, square and round flange, two-hole flange, and take-up unit. Also available are three pressed-steel housings and five inserts (wide and narrow set screw, wide and narrow lock collar, and adaptor sleeve) covering bore diameters that range from 12 to 90mm. The units are built on demand, offering the highest flexibility for customers.
J-Line bearing units will be easily identifiable in their new, fresh NSK packaging design for the European market.
Ready to ship from April 2019, J-Line bearing units are suitable for use in sectors that include agriculture, cement, construction, food, material handling, packaging, paper, steel, textiles and many others.
To help simplify selection, NSK has published a new Bearing Unit Catalogue containing both J-Line and Self-Lube ranges. An electronic version will be placed on the NSK website ready for download.
NSK Europe Ltd. is the European organisation of the Tokyo-based bearing manufacturer NSK, which was founded in Japan in 1916 and today employs around 31,000 people in its worldwide operations. The products and solutions provided by the industrial and automotive supplier can be found wherever things move. In addition to nearly all types of rolling bearings, the company´s portfolio includes housed bearings, linear technology, wheel bearing units, transmission and engine bearings and steering systems. The company is oriented to perfection in all of its business activities. Its aim is quality leadership in its industry, which it strives for through a continuous process of improvement, excellent product development, optimised production processes and customer-oriented service processes.
NTN-SNR’s SMART TEMP: Parts heated and mounted in complete safety for optimal reliability
NTN-SNR launches SmartTEMP, its new range of induction heaters. They control the temperature whilst mounting, to preserve the integrity of the materials and ensure total safety when mounting components (bearings or gears). Heating gradually and controlling temperature deltas, preserves the functionality of sensitive parts. The touch screen along with the ability to store heating information leads to better traceability. Ease of use and the scope of range make SmartTEMP a very high-performance tool for all industries. With this innovative induction heating device, NTN-SNR furthers the dissemination of good practices concerning the heating and mounting of rotating parts. This is an essential phase when one considers for instance that 17% of bearing failures are caused by incorrect mounting. With the market release of SmartTEMP, NTN-SNR continues to pursue its objective of improving the productivity of its industrial clients by extending the useful life of their parts and machines. Unique cutting-edge functionality The SmartTEMP range offered by NTN-SNR is designed primarily to ensure the safety of the operator and the part being heated. The unique design featuring a coil system beneath the workpiece heats the bearing’s two rings evenly and consistently to prevent any temperature distortions between the different components. Two probes constantly control the difference in temperature between the two rings, thereby ensuring full control of the heating process and the total integrity of the bearing’s physical characteristics. The range comprises seven models that are capable of heating parts with masses ranging from a few grams to 1.6 tons. The RAMP mode allows the rise in temperature to be set evenly over a given period of time in order to heat up sensitive parts very gradually. This innovation is crucial for protecting such parts as gears, whose teeth may become brittle if heated too quickly. The SmartTEMP ensures accurate control over the mounting procedure to fully protect the integrity of the physical characteristics of the materials making up the various parts being heated. It thereby extends the useful life of rotating parts and the machinery.
High performance, user-friendly and a rugged design
The SmartTEMP’s new processor optimises the device’s performance by adapting its power requirement to the characteristics of the part. The current efficiency rises to 0.8 against 0.3 with a traditional heating device. Heating time is thus reduced by 30%, thereby offering significant energy savings. The SmartTEMP features an easy-to-use and intuitive touch screen. The software, which can be set to the operator’s language, downloads the heating data and exports it on a USB stick for full traceability of the mounting of the part. Nowadays this data is essential for connected 4.0 factories, the unit can also carry out self-diagnostics. In order to operate continuously, SmarTEMP’s new design is rugged and highly reliable. The electronic components are located in a separate compartment, and the aluminium frame enable it to bear heavy weights, withstand impacts and extreme temperatures.
Over 17% of bearing failures recorded by NTN-SNR are due to mounting errors, particularly uncontrolled heating of the parts, which is sometimes carried out using a blowtorch or oil bath, which have no accurate temperature control. The recommended heating temperature is generally 110°C, but this can vary according to the materials. Through its Experts & Tools service, NTN-SNR is keen to pass on information regarding good practices, training and the use of the correct tools. The SmartTEMP, is available for all industrial maintenance professionals, ensuring precise mounting of component parts and so increasing the productivity of the machines.
Bearings for mining and quarrying: in pursuit of performance
Whether original equipment or spare parts, increase the performance of your bearings for mining and quarrying.
Bearings for mining and quarrying: why choose NTN-SNR?
NTN-SNR is the preferred partner for the mining and quarrying sector.
Choose one of the largest ranges on the market
We have the bearings you need for every stage of your mining or quarrying operation: extraction, crushing and grinding, screening and conveying.
Efficiency: boost the performance of your equipment
- Improved bearing characteristics: load, speed, torque and noise with the ULTAGE spherical roller bearings product range.
- Benefit from a range suited to the requirements of your applications, such as SRB EF 800 for vibrating applications.
Reliability: increase the service life of your equipment
Improve the service life of your bearings and decrease your maintenance operations, by using:
- Tools designed for harsh environments (dust, moisture, heat)
- Lubrication solutions for heavy loads and vibration
Eco-responsibility: focus on economic performance
For the same level of performance, the power consumption and the footprint of the range of ULTAGE roller bearings have been reduced
A range of bearings for each stage of operation
NTN-SNR offers you specific bearings for each operational stage in mining and quarrying.
A range of bearings for construction machinery
Crushing and grinding:
Ranges of cylindrical roller bearings, tapered roller bearings and ULTAGE® spherical roller bearings.
- Primary applications: jaw, impact and gyratory crushers.
- Secondary applications: hammer and cone crushers.
The SRB EF800 range
- Vibrating applications: shaker screens
Ranges of ball-bearings, spherical roller bearings (standard and narrow series), houksed bearing units and plummer block housings
- Head, tension and tail pulleys
- Drive rollers
NTN-SNR: working closely with customers
Our customer service guarantees the efficiency of your equipment, from the design through to operation.
- On-site technical assistance: our experts will analyse your installation and provide assembly advice.
- Training: our training courses will improve your knowledge of bearings.
- Failure analysis: our experts will assist with detection of any problems so that corrective actions can be taken as soon as possible.
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