Articles About wear
(SPONSORED CONTENT)Webinar: Advanced Mainshaft Bearing Solutions for Wind Turbines
Mainshaft bearings inside wind turbines are subjected to extremely harsh operating conditions that result in failure patterns which include surface-initiated fatigue, abrasive wear and uneven internal load distribution. This webinar will introduce you to the latest engineering advancements in spherical roller bearing design, including solutions that allow potentially damaging thrust to be safely transferred through the bearing to the housing support. The resulting reduction in torque, friction and heat significantly improves the overall efficiency of the system, thereby enabling the wind turbine to generate more power – more reliably! Webinar Courtesy of Schaeffler
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Wear is a very important topic for dry running plastic gears. Over the past few years, the authors have worked closely with a number of manufacturers of plastic gears to investigate the problems of gear wear in detail. Together they have developed a calculation method that can be used to predict where and when local wear will occur on a tooth flank. Their findings have also just been published in the final version of VDI 2736.
More than a decade of intensive research and development has resulted in two new technologies that, when used in combination, expand the performance of rolling element bearings well beyond previous limits.
Wind turbine gearboxes are subjected to a wide variety of operating conditions, some of which may push the bearings beyond their limits. Damage may be done to the bearings, resulting in a specific premature failure mode known as white etching cracks (WEC), sometimes called brittle, short-life, early, abnormal or white structured flaking (WSF). Measures to make the bearings more robust in these operating conditions are discussed in this article.
Even when the critical components of industrial power transmission gear drive systems are properly designed, specified and manufactured consistent with application requirements, performance problems can develop over time and failure may follow.
Bearings that show wear may not always need to be replaced. Depending on the degree and type of wear, they may be candidates for reconditioning, a process that restores bearings to like-new specifications and performance - at an average 50 to 60 percent of the cost of replacement.
Reliability and maintenance engineers can improve uptime and save money on both long-term maintenance and downtime costs by properly diagnosing and correcting bearing vibration issues when they exceed their acceptable limits. This requires inspecting the housing as well as the liner for wear, and replacing them as a pair when the housing is worn, so that wear-in between the mating surfaces can occur.
For the lubrication of open gear drives used in different industrial applications such as cement and coal mills, rotary furnaces, or where the sealing conditions are difficult, semi-fluid greases are often used in preference to fluid oils. For girth gear applications the greases are used with a splash or spray lubrication system. The selection of such greases influences pitting lifetime and the load-carrying capacity of the gears, as well as wear behavior
Mechanical guiding systems, such as crossedroller bearings, work well for most motion control applications; however, when precision, angular repeatability, and geometric performance (runout, straightness) are critical or where submicron bearing rumble is problematic, air bearings are recommended. An air-bearing stage is a rotary or linear positioner that floats on a cushion of air, using one of several preload mechanisms, nearly eliminating mechanical contact and thus wear, friction, and hysteresis effects. Here are eight reasons why an air-bearing stage might be the right choice for your application:
Slow speed operation of fan systems within the air handling industry is generally performed due to two reasons: a coast down operation is required for hot (induced draft) fans to cool down before shutdown (often by using a turning gear), and operational efficiency improvements can be achieved during non-peak periods by slow speed operation using a VFD. In either case, when these fans are supported by hydrodynamic bearings, it is the oil film thickness developed from the bearing-shaft interaction that limits the minimum speed that can be maintained without causing premature wear and bearing failure. This paper will present a brief overview of lubrication theory and critical design parameters to achieve slow speed operation.
Bill Walton â“ a 7 foot tall anomaly from the annals of basketball history who wears tie-dye shirts, listens to the Grateful Dead and, according to his own outlandish proclamations, hasnâ™t taken an indoor shower in 35 years â“ is well-known for looking at average accomplishmentsand being overcome with extreme fits of emotion.
In an industrial application, equipment uptime is vital for on-time performance and profitability. The rotating members of industrial machines are subject to the highest degree of wear and are more susceptible to failure than non-moving parts. Bearing surfaces are the most critical and often the most expensive portion of the rotary assembly; it is imperative to protect these components. The primary protector of these components is the industrial seal.
When talking about high-end machining or manufacturing applications that include direct-drive technology, one of the key advantages of utilizing this particular transmission method is its endurance. Because of the very nature of direct-drive motors they are able to operate at peak performance levels indefinitely â” without any kind of wear or aging â” as long as the motor isnâ™t pushed past its capacity. Unfortunately, because this isnâ™t a perfect world, unexpected things can happen which can cause the motor to overheat. Whether the heat source is due to a parameter being input incorrectly, or an unexpected external force causing more resistance than expected â” it is important to have certain forms of thermal protection in place. Since torque motors are built in such a way that they cannot be repaired and yet maintain their efficiency, it is vital to prevent any overheating â” thus precluding the need to purchase a new one.
in the performance and life of a rolling element bearing. Less than 10 percent of bearings reach their theoretical L10 life, and poor lubrication can be attributed to 80 percent of those that fall short. Ideally, a lubricant forms a film layer between moving components in a bearing, separating moving parts, minimizing friction and preventing wear between balls or rollers, raceways and retainers. Lubricants also protect metal surfaces from corrosion and moisture, dissipate heat and can even prevent the ingress of contaminants.
Latest Sealing Technologies Offer Optimum Wear and Frictional Characteristics.
News Items About wear
1 KISSsoft Offers Local Wear Simulation (May 15, 2014)
A new progressive wear method is used to define the wear for cylindrical gears...
2 Inch and Metric Magnetic Disk Couplings from Sterling Instrument Feature No Wearing Parts (July 8, 2009)
Magnetic disk couplings from Sterling Instrument (ISO 9001:2000+AS9100B Registered Manufacturer) feature no friction or wearing parts, us...
3 Zero Wear Clutch/Brake (November 19, 2008)
Torque is transferred magnetically with the PHT units, there is no friction surface to wear, which means that clutches and brakes have a ...
4 Iwis Offers Grip Chains With Wear-Resistant Clamping Elements (November 29, 2017)
Chain manufacturer Iwis presents grip chains that have wear- and corrosion-resistant clamping elements that ensure safe and reliable feed...
5 Frelon Lined Linear Bearings from QBC Offer Load and Wear Rate Design Advantages (September 4, 2008)
An expanded line of linear ball bearings from Quality Bearings & Components are stocked in both U.S. and European standard specificat...
6 Bearings Six Times More Wear Resistant (November 16, 2010)
Maintenance-free plastic plain bearings made from iglide T500, one of 12 standard materials from bearings specialist igus, are high-tech ...
7 Maxon Spindle Drives Available in Wear-Proof Ceramic (September 6, 2013)
The GP 16 S with ceramic spindle joins the ranks of the existing 16 series spindle drives. With its unique metric M6 ceramic spindle, it ...
8 Tsubaki Smart Tooth Sprockets Utilize Patented Wear Indicator Technology (June 29, 2015)
U.S. Tsubaki Power Transmission, LLC recently introduced Tsubaki Smart Tooth. Tsubaki Smart Tooth sprockets utilize their Wear Indicator ...
9 VBN Components Vibenite 290 Launched as Wear and Heat-Resistant Steel (December 28, 2017)
VBN Components is launching the world's hardest near-net-shape steel, Vibenite 290. The hardness of the alloy, plus its high carbide ...
10 Napoleon Engineering Services Announces Rolling-Contact Fatigue and Wear Testing (October 10, 2017)
The largest independent bearing testing and inspection facility in the United States, Napoleon Engineering Services (NES) has announced t...
11 KISSsoft VDI 2736 Receives New Supplement for Calculating Plastic Crossed Helical Gear Deformation and Wear (August 17, 2016)
The application area of plastic gears has grown significantly in the last decade. The requirements from the industry to design stronger, ...
12 Tsubaki Expands Family of Chain Wear Indicators (November 2, 2018)
The new BS Large Size Indicator is available in sizes RS20B to RS48B and the ANSI Large Size Indicator – covers sizes from RS100 ...