Processing Methods for Slewing Ring Bearing

Every step of processing of slewing bearing is controlled strictly by  UWE bearing staff.Turning and grinding are the most used methods of processing used in the slewing ring bearing, roller path processed by turning and grinding (or lathe finishing replacement) are the critical process which determines manufacturing quality of the slewing ring bearing. With the development and wide-applications of CNC technology, equipment for turning and grinding of the slewing ring bearing are mostly CNC lathes, technology parameter optimizing of CNC processing technic is the key point of controlling manufacturing geometry quality of the slewing ring bearing.

WIRE RACE ROLLER BEARING TO PART No. 3054115

3054115 is wire race roller bearing, which can be used in harsh,diffcult and bad working condition.
UWE designed the wire race roller slewing bearing using special material which is light enough for tank and other military equipment. 3054115 wire raceway bearing was exported to Indian customer, and got customer great satisfication. UWE engineers and professors adopt special structure and material making the total of each piece is only 120kg.

This special construction principle produces an extremely compact bearing, which also suits very small spaces. Another plus: the low friction and high load capacity of our Wire Race Bearings reduce energy consumption.

More information about wire race roller bearing, please contact sales@uwe-bearing.com

Track Roller Bearing

We develop and sell two types of Track Roller Bearing, Track Roller Bearing in Loose Rib type and Track Roller Needle Roller Bearings in Bolt type. Easy to installation and replacement due to the structure feature, and also with the feature of long working life under worse environment. Our Track Roller Bearings are mainly used in the industries of mine, metallurgy, transport, hoisting machinery.

more information, please contact jenny.zhang.bearing@gmail.com

worldwide demand for bearings is expected to increase

Worldwide demand for bearings is expected to increase 8.0 percent per year to $95 billion in 2016. Unmounted ball and roller bearings will make up threequarters of total sales in 2016, with the market for these products reaching $71 billion. Global sales of unmounted plain bearings will rise to $11 billion in 2016, while aggregate demand for mounted bearings, bearing parts and combinationtype bearings will be $13 billion in the same year. In mature bearing markets (such as Western Europe, Japan, and North America) growth in demand will be driven by rebounding motor vehicle production and a healthy fixed investment environment. In nations where the bearing market is developing, sales will increase on rapidly increasing durable goods manufacturing and the improving ability of the average consumer to purchase items such as motor vehicles and appliances -- boosting demand for these goods both from manufacturers and in the aftermarket.

Prematurely Damge of Slewing Bearing

Using the slewing bearing properly, a fatigue life is easy to meet. But unexpected matter occurred on the slewing bearing which will lead prematurely damage, so its life span will be shorted. This kind of prematurely damage, is an opposite matter to fatigue life, which is called quality using limitation of damage or accident. An prematurely damage is mainly caused by unproper installation, usage and lubrication, foreign matter from outside into the slewing ring, and also the unabundant research on heat effection of the shaft and shell.

precision bearing

Based on the ISO Classification Standard, the precision bearing is devided into five levels: P0,P6,P5,P4,P2, with the level from general precision to premium precision, and P0 is in general precision, and the other 4 levels are in precision classification. Based on different classification standard and different bearings, the classifications are different, but with the same signification. On the usablity of the precision bearing, it requires high precision range, high-speed rotation, friction and low friction change.

 Differences between the precision bearing and the general bearing:

 1. Required values for sizes are different, for the products in high precision levels, their size deviation values (inner diameter, external diameter, ellipse, etc.)are less than that of products in low classifications.

 2. The required values for rotating precision are different. The higher precision level, more stricter value is required of the bearing products.

 3. The required values for macroshap and surface quality are different, the higher precision level it is, the stricter value for the rotating precision required. 

 4. For bearing products in special high precision levels, their materials are much more beneficial than that of general precision bearing products. 

Methods of Improving the Accuracy of Precision Bearings

In order to improve the actual coordinating accuracy of precision bearings during the installation, measuring methods and tools which will not lead the distortion of bearings must be used, to work on the accuracy measurement on the coordinating surface dimensions of inner holes and external rings of precision bearings, and then work on a multianalysis on the measured datas. On the accouont, .to decided the precision installation parts for sizes of the axle and the eyelet.

Materials for Sealing Ring of Slewing Ring Bearing

Materials for sealing ring of the slewing ring bearing usually is butadiene-acrylonitrile rubber SN7453, structure is often sealing in lip type. In places with the large discrepancy of climate and temperature, can use zeolite base rubber as the material of sealing ring for the slewing ring bearing, its reaction temperature range is much larger than that of butadiene-acrylonitrile rubber, and its highest reaction temperature can reach to 200 ℃. Regarding to sealing structure, there is special structure of sealing ring is shown as double-lip sealing for the wind turbine slewing ring, this sort of structure can avoid radiation and oxidation gases into the roller path, to guarantee quality of the roller path. In some special wind fields under some conditions, materials and structures of sealing ring of the slewing ring should be specially considered.

Storage of the Slewing Ring

Installation should be done within 12 months after leave factory, if not in use, do not open the package. When in maintainance, process roller path, outer surface and gear surface of the slewing ring with rust prevention.
Place the slewing bearing on the flat and dry ground.
If the slewing bearing is stored longer than 12 months, should re-sprey anti-rust paint.
If several suits of slewing bearing are stacked up, between each suit of the slewing bearing, place at least 3 wood heels equisplacedly and along the circle direction, and for each layer, heels must be at the same position.

Metallurgical industry

With experience and expertise in bearings, seals, services, lubrication systems and mechatronics, UWE is a strong partner. A partner that can help increase productivity, reduce costs and protect the environment and workforce. 
Cylindrical Roller Bearings, Spherical Roller Bearings, Tapered Roller Bearings are specifically designed for mining machines. Mine operators consider the maximize uptime, reduce maintenance and replacement costs, and improve productivity as their goals. UWE helps meet these goals by considering their entire system and recommending solutions that keep mining equipment up and running at top performance. These products and services help mine operators and maintenance teams keep equipment running reliably.

Wind Turbine Slewing Ring Bearing

Quality of the slewing ring bearing is mainly due to quality of its roller path, including machine work quality and heat treatment quality. And quality of the roller path is based on equipment and technique guarantee, so the critical point for assuring quality of the slewing ring bearing is properly selection of equipment and technique.
Wind  turbine slewing ring bearing is mainly used in bad envoirnment, so requirements for lubricating, sealing and anticorrosion are strict, by using proper lubricating grease and method, sealing material and structure, anticorrosion technique.
More information about slewing bearing, please contact jenny.zhang.bearing@gmail.com

Wire Race Bearing

The wire raceway ball bearing can sustain forces from whatever directions due to their 3-point or 4-point geometry .The rings have the advantage that they fit themselves tightly into the bearing rings of the mating structure and compensate machining tolerances. With this technology high precision even if large bearing diameter is achieved. They are convenient and economical to use .The new process aimed at tightly matching between steel ball and race ways .Thus the load ,the capacity ,and precision of the bearing elements are increased and they are better adapted to particular demands .

There are four types of the wire raceway ball bearing .For example ,4-point contact bearing assembly with a carrying angle of 45°or 30°; double row inclined bearings for rational speed and very high precision ; double row 3-point contact bearings with low rotational resistance ,flexibility and a very good running behavior ;and cylindrical roller bearings with stiffness and compactness .We have seven products series which can be widely applied in machine building ,medical technology ,textile machines ,food and packing industry .The bearings are ideally suitable for particular applications such as under clean room, high temperature ,or vacuum conditions .At the same time ,the customers can planned the particular bearings according to their requirements .We are rich in excellent experience and products series. Therefore, we are fully able to meet the customers’ requirements about the standard or non-standard.

more information about wire race bearing, please contact sales@uwe-bearing.com

wire race ball bearing

A wire race ball bearing is a four point angular contact ball bearing.  It consists of four wires which are formed into a circle to fit a housing groove machined into the inner and outer diameters of the relatively stationary and rotating parts.  Into each of the wires is produced an accurately profiled groove which provides the bearing track upon which the balls run.  

These balls are separated by a continuous cage band and thus the load is evenly carried.  This cage band prevents any friction between the balls and aids lubrication.  As it is the bearing elements that carry the load the role of the housing is merely to to hold the bearing assembly together.  That is the choice of housing material does not affect the strength of the bearing.  The housing can be made from steel, cast iron or aluminium alloys. The wire races are made from silicon chrome hardened and tempered wire with a minimum sectional hardness of 52 HRC.

The wires are supplied with a an accurate gap to allow for differential expansion (between the wires and the housings) over a wide temperature range typically 240 - 390 K.  Owing to this gap the wires fit the housing exactly which eliminates machine tolerances.

A typical 3-part housing which is suitable to carry both radial and axial loads in nearly equal proportions.  The cross section in this case is uniform and thus has a contact angle of 45 degrees.  This angle can be reduced to form a rectangular cross section and thus change the load carrying characteristics for example to sustain more axial and less radial loads.

more information about wire race ball bearing, please contact sales@uwe-bearing.com

wire race roller bearing

UWE designed the wire race roller slewing bearing using special material which is light enough for tank and other military equipment. This kind wire raceway bearing was exported to Indian customer, and got customer great satisfication. UWE engineers and professors adopt special structure and material making the total of each piece is only 120kg.

This special construction principle produces an extremely compact bearing, which also suits very small spaces. Another plus: the low friction and high load capacity of our Wire Race Bearings reduce energy consumption.

More information about wire race roller bearing, please contact sales@uwe-bearing.com

stainless steel slewing rings

The structure of the stainless steel turntable bearings and wheel bearings, the more common four-point contact ball stainless steel turntable bearings and crossed roller stainless steel turntable bearing. Structure the way also: internal tooth four-point contact ball slewing bearings, external gear four-point contact ball slewing bearings, gear-type four-point contact ball slewing bearing, internal tooth cross roller slewing bearing, the outer teeth Cross Roller bearings, toothed cross roller bearings.
More common wheel bearings: stainless steel turntable bearing, not only in materials has obvious advantages, but also in the process, the precision control, than ordinary bearings, strict. In the course of the stainless steel bearing stability, low noise, corrosion-resistant, wide range of applications; with rust, corrosion resistance, wet underwater corrosion, strong corrosion working environment. Commonly used in medical devices, cryogenic engineering, optical instruments, high-speed machine tools, high-speed motor, printing machinery, food processing machinery.
inquiry of slewing bearing, contact sales@uwe-bearing.com
web:www.uwe-bearing.com

Overhauling for Slewing Ring Bearing

Revolving inspect is necessary to check correct installation after the slewing bearing is intalled. For small size machinery, can revolve the slewing bearing by hand, to ensure whether can run smoothly. Inspection items include revolving not smoothly due to foreign objects, bruises and indentation; moment force unstable due to unproper installation and unproper processing of support; over moment force due to backlash too small, installation error and sealing friction. If there is no abnormal status, dynamic run of the slewing bearing can be proceeded.

any inquiry of slewing bearing, please contact Jenny : sales@uwe-bearing.com

Deck crane slew bearing rocking tests

A number of incidents have occurred recently involving failure of the slew bearings of ships’ cargo deck cranes, resulting in crane losses and serious injury to personnel.These failures have been caused by undetected excessive wear in the slew bearings.
Rocking tests:Crane manufacturers generally recommend that ‘rocking tests’ are carried out every six months in accordance with their instructions, and that the results are recorded and monitored in order to ensure the wear tolerances remain within the limits permitted by the designers.Cranes which are particularly at risk are those with single ball race slew bearings. Cranes fitted with this type of slew bearing must have rocking tests carried out, in accordance with manufacturer’s instructions, to determine that the amount of wear in the bearing races is within permitted limits.Although cranes with single ball race slew bearings are considered to be most at risk, rocking tests on all deck cranes,where recommended by the crane manufacturer, must be carried out and the results must be recorded.Lloyd’s Register surveyors are being instructed to review the results of rocking tests at all future Annual Thorough Surveys.If no rocking test has been carried out in the previous six months, the crane in question will not be certified for further use.It will also be recommended that the crane is taken out of service and the Lifting Appliance Register will be endorsed accordingly.
Measuring proceadures for wear in slewing bearings for rope luffing cranes.The slewing bearing is an essential part of the crane and must be well maintained.Over the years the slewing bearing will have some wear, and to be able to know if there is a need for changing the slewing bearing it is needed to keep a record of the wear.The measurements should be taken reqularly, every 6 months.Measurements can be sent to the Maker for evaluation.Note When measurements are to be taken the ship shall have as little list/trim as possible.

Work and Utility of the Slewing Bearing

A slewing bearing is a revolving bearing with gear rings drove by a motor. The slewing bearing usually is utilized in heavy machines that slowly revolves on a horizontal platform. Typically the slewing bearing was used in solar energy tracking system, crane, wind power generator, hoisting system etc.. For the highly precision slewing bearing, it can also used in construction machinery.

Types of the slewing bearing are usually into three modes: without gear, internal gear and external gear.

worldwide demand for bearings is expected to increase

  Worldwide demand for bearings is expected to increase 8.0 percent per year to $95 billion in 2016. Unmounted ball and roller bearings will make up threequarters of total sales in 2016, with the market for these products reaching $71 billion. Global sales of unmounted plain bearings will rise to $11 billion in 2016, while aggregate demand for mounted bearings, bearing parts and combinationtype bearings will be $13 billion in the same year. In mature bearing markets (such as Western Europe, Japan, and North America) growth in demand will be driven by rebounding motor vehicle production and a healthy fixed investment environment.In nations where the bearing market is developing,sales will increase on rapidly increasing durable goods manufacturing and the improving ability of the average consumer to purchase items like motor vehicles and appliances boosting demand for these goods both from manufacturers and in the aftermarket.

For more information, please contact sales@uwe-bearing.com

Slew bearing for WIND ENERGY

UWE is a leading supplier of Blade and Yaw bearings for wind energy, from Small Wind Turbines of 5kW to the latest Multi-MW Offshore turbines up to 5MW.

The custom designed UWE slewing bearings are engineered in close cooperation with turbine manufacturers: our dedicated engineering team is at your service for new developments and design optimisation.

YWE slewing bearings are delivered worldwide from our state-of-the-art production facilities: with more than 120,000 blade bearings representing 67GW of installed wind power (including 2.1GW Offshore), Rollix has a unique track record in the wind energy industry.

Slew bearings for MEDICAL application:

The UWE slewing rings dedicated to Medical applications are designed for a high rotating speed, constant rotating torque and low noise under rotation controlled in our anecoïd chamber, specifically for Radiotherapy applications. 

UWE has developed a specific testing room to analyse the impact of raceway and gear data on noise level, we then modify our geometry in accordance with required noise level determined by the customers requirements. 

UWE also supplies Slewing Ring for pharmaceutical industry for all production steps, mixing, filling, cleaning.

The perfect circularity and the high precision of our bearing are the result of our specific finishing and the matching of the rings and the rolling elements. 

We also propose innovative sealing solutions to avoid any leakage in a clean environment such as “white room” class.

Slewing bearing

To "slew" means to turn without change of place; a "slewing" bearing is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventionalcrane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill.

Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel are 4 metres diameter and fit over a 3.5 metre axle. Slewing bearings resemble oversize aircraft control surface bearings.

Slewing bearings often use two rows of rolling elements. They often use three race elements, such as an inner ring and two outer ring "halves" that clamp together axially.

Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.

worldwide demand for bearings is expected to increase

Worldwide demand for bearings is expected to increase 8.0 percent per year to $95 billion in 2016. Unmounted ball and roller bearings will make up threequarters of total sales in 2016, with the market for these products reaching $71 billion. Global sales of unmounted plain bearings will rise to $11 billion in 2016, while aggregate demand for mounted bearings, bearing parts and combinationtype bearings will be $13 billion in the same year. In mature bearing markets (such as Western Europe, Japan, and North America) growth in demand will be driven by rebounding motor vehicle production and a healthy fixed investment environment. In nations where the bearing market is developing, sales will increase on rapidly increasing durable goods manufacturing and the improving ability of the average consumer to purchase items such as motor vehicles and appliances- boosting demand for these goods both from manufacturers and in the aftermarket.

more information, please contact sales@uwe-bearing.com

UWE wind turbine bearing

UWE provide yaw, blade/pitch bearing and ywa bearing to our customers reliablely. UWE wind power bearing for 3KW-5MW wind turbine.Yaw bearing is mounted between the connection of tower and cabin.

Pitch bearing is mounted between the connection of blade root and wheel hub. Blade bearings of wind turbines are being challenged by bigger rotors including the trend to continuous pitching.

The yaw bearing is the most crucial and cost intensive component of a yaw system found on modern horizontal axis wind turbines, which must cope with enormous static and dynamic loads and moments during the wind turbine operation, and provide smooth rotation characteristics for the orientation of the nacelle under all weather conditions. It has also to be corrosion and wear resistant and extremely long lasting. It should last for the service life of the wind turbine while being cost effective.

Each wind turbine generator comprises of one yaw bearing and three pitch bearings, the material of the rolled rings is 42CrMo with quenching and tempering. Raceway surface intermediate frequency induction hardened. Due to complexity of the stress situation, the bearing must bear impact and carry high load. 20 years is a required lifetime for the wind turbine generator, it is also required by yaw bearing and pitch bearings as the mounting cost is too high.

More information or inquiry of slewing bearing, please contact sales@uwe-bearing.com