bearing failure analysis

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Plain Bearing Damage And Failure AnalysisMake Your Bearing More Durable

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  • Plain bearing failure analysis is important in every link

The purpose of plain bearing failure analtsis and inspecting damaged bearings and their mating parts is to determine the probable causes of the bearing failure and to avoid any future failures.

Plain Bearing life and bearing failures solution

Causes of plain bearing failure

Here Are The Seven Most Common Reasons Why Plain Bearings Fail:

    • Lubrication Failure
    • Contamination & Corrosion
    • Misalignment
    • Distorted Components
    • Poor Fitting
    • Fatigue
    • Inadequate Internal Clearance
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How to identify whether the bearing has a fault?

Plain Bearing Failure Analysis

Plain bearing is an important part of modern mechanical equipment, most of the mechanical equipment has its existence, vibration motor, cooling fan, and even shared bike, washing machine, aircraft, high-speed rail, yacht……All parts that need to rotate need bush bearings. If the bearing fails, how to troubleshoot it?

According to the different sources of fault detection signals, the bearing fault diagnosis technology is mainly divided into the following kinds:

1. Oil analysis method

Oil analysis method is to extract part of the bearing lubricating oil as the oil sample, analyze the shape, composition and concentration of the wear chips in the oil to determine the location of the wear chips and determine the degree of damage to the bearing.The method is suitable for oil-cooled and oil-lubricated bearings.

bearing failure analysis
bearing failure analysis

2. Temperature monitoring method

When the equipment runs in an abnormal state, the temperature of its parts will also change. Defects and damages of mechanical equipment can be found by monitoring the temperature change.The operating temperature of the bearing can reflect its working state and fault mode. The temperature monitoring method is to use the temperature sensor installed on the bearing seat or box body to monitor the real-time change of temperature so as to determine whether the bearing has a fault.

3. Acoustic emission analysis method

Acoustic emission detection technology is a fault detection technology that can be applied to metal materials without damage.The source of acoustic emission signal is the impact signal caused by metal material impact, friction and metal parts fracture.

The early surface of the bearing is slightly damaged, and the plastic deformation is until the fracture failure of the bearing element. When the bearing encounters these defects in the process of working, it will produce transient elastic stress waves and release energy.Through acoustic emission sensor and acoustic emission detector to analyze the sound signal, through the acquisition of bearing fault information, we can judge the degree of bearing damage and the location of the fault.

bearing failure analysis
bearing failure analysis

4. Vibration analysis method

The dynamic characteristics of mechanical equipment can be expressed by vibration signals, and the working state and fault of the equipment can be obtained by analyzing and processing the abundant information.The vibration analysis method is to use the data acquisition card (DSP) or NI board card to collect the vibration fault signal of the bearing through the sensor installed in the bearing seat or the inside of the box, and then get the vibration data through the computer software processing and analysis, and diagnose the nature and type of the fault.

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Plain bearing failures reduce a plant’s operating efficiency, increase downtime, drive cost of operations up and, in the worst cases, may injure workers.

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WHAT ARE THE MOST FREQUENT CAUSES OF BEARING FAILURE FOR YOUR BEARING APPLICATIONS?

While it may seem like common sense, standard wear and tear is one of the leading causes of plain bearing failure.

Improperlubrication is the major cause of sliding bearing failure.

Bearings can only achieve maximum performance levels with adequate lubrication.

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Did you know that external environmental factors and improper mounting are the most common causes of bearing failure? The bearing type, application and situation are all unique, so you must carefully consider a number of factors before coming to a conclusion about what’s causing your bearings to fail.

COMMON FACTORS THAT LEAD TO PLAIN BEARING FAILURE – FAILURE ANALYSIS

CONTAMINATION

Causes: Dirt, abrasive grit, link, dust, steel chips from contaminated work areas, dirty hands or tools, or foreign matter in lubricants or cleaning solutions.

What to look for: Denting of rolling elements and raceways, causing vibration

How to fix it: Filter the lubricant, clean work areas, tools, fixtures, and hands to reduce the risk of contamination.

IMPROPER MOUNTING

Causes: Improper installation of the mounting. In most instances, bearings should be mounted with a press fit on the rotating ring.

What to look for: These are some of the prevalent conditions that can cause denting, wear, cracked rings, high operating temperature, early fatigue, and premature failure of bearings (among many others).

-Mounting bearings on shafts by applying pressure or blows to the outer race
-Mounting bearings into a housing by pressing on the inner ring
-Loose shaft fit
-Loose housing fit
-Excessive tight fits
-Out of round housings
-Poor finish on the bearing seat

How to fix it: Install mountings properly, and provide training to ensure all employees understand the difference between a properly and improperly installed mounting.

MISALIGNMENT

Causes: Commonly caused by bent shafts, out-of-square shaft shoulders, out-of-square spacers, out-of-square clamping nuts or improper installation due to loose fits. Misalignment can result in overheating and separator failure.

What to look for: A wear path not parallel to raceway edges on the raceway of the non-rotating ring.

How to fix it: Inspect shafts and housings for runout of shoulders and bearing seats, use precision grade locknuts.

FALSE BRINELLING

Causes: The rapid movement of the balls in the raceway while the equipment is idle. The quickly moving elements remove the lubrication, and lack of rotation in the bearing does not allow fresh lubricant to return to the spot.

What to look for: Linear wear marks in axial direction at the rolling element pitch, no raised edges as opposed to marks due to incorrect mounting.

How to fix it: Eliminate or absorb external vibration, and use lubricants containing anti-wear additives.

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