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Correct Installation And Service Life Of Slewing Bearing

1.Proportional relationship between correct installation of slewing bearing and service life

As a precision rotating core component, the slewing bearing, the clearance value, the end runout, the axial runout and the radial runout, are all calculated by the wire and the track. It is very important to ensure the correct and precise installation of the bearing. Affect the service life and use effect of the bearing.

The design life of normal bearings is 20 years, and the service life is 10 years. Under the condition of ensuring accurate installation, correct use, maintenance and maintenance, the service life is about 10-12 years, and the heavy-duty bearing is about 5-8 years.

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Notes on installation:

1. Ensure the rigidity and strength of the installation base surface, ensure that the stress is released completely, and the installation surface should be kept clean and the installation accuracy meets the relevant regulations.

2. Make sure that the mounting bolts are high-strength grade 10.9, the nuts are grade 10, the gaskets are quenched and tempered gaskets, the tolerances of the mounting holes of the bearings are within the normal range, and each joint surface should be cleaned to remove paint, iron filings, rust inhibitors, etc.

3. The seal is the lubrication system of the bearing. Check whether the seal is still in the correct position, and clean the fitting part of the mounting plane of the slewing bearing.

4. When connecting with high-strength bolts, pre-tighten the bolts: It should be pre-tightened in three steps, 30%, 80%, and 100%, respectively, to achieve the specified pre-tightening torque. In addition, check the fit of the slewing bearing and the mounting surface, usually with a feeler gauge. If the fit is not good, fill it with an appropriate material.

. It is strictly forbidden to weld the slewing bearing to avoid the deformation of the inner and outer rings, which will affect the normal use.

6. During installation, if the installation base surface is uneven, thin copper sheets can be prepared. If the installation plane is indeed installed, it should be considered to leave convex and concave shoulders or positioning blocks for radial positioning.

7. The tempering belts of the upper and lower raceways should be staggered by 180°. When installing crane and excavator turntable bearings, the tempering belt of the rolling ring should be placed at an angle of 90° with the direction of the boom, and the tempering belt of the rolling ring should be fixed. , should be placed in a location with less frequent work.

8. After the installation work, the raceways and gears should be filled with grease and regularly maintained.

9. Make sure that the gear meshing reaches 70% and the force is even.

2.Processing skills of precision slewing bearing

High-precision slewing bearing slewing bearings, especially emphasized, low height, thin wall thickness, many processes, and high precision requirements, such as heat treatment, tooth processing, drilling processes, all have an impact on the overall machining accuracy and quality control of the bearing, so what can be done? Woolen cloth?

In order to ensure both quality control and parameters, the formulated process needs to be particularly fine, and auxiliary tooling and even tire tools are essential.

First, understand the effect of heat treatment on deformation.

Secondly, the influence of tooth processing, tooth shaping, and grinding.

Bearing ground clearance, especially negative clearance.

Auxiliary tire tools, in heat treatment, finishing machining, gear shaping, gear grinding, grinding with end face and end runout, radial runout, common normal after grinding, and tooth runout parameters, all are the connection between the process and the process, and the precise control.

Therefore, for bearing design and selection calculation, the selection of working conditions must at least meet the requirements, and there will definitely be contradictions and errors.

For precision slewing bearings, understanding the manufacturing process is the key to knowing the performance of the bearing.

Top 1 High Quality Slewing Bearing Installation Update 2022

What is the reason why the slewing bearing is not installed smoothly or even cannot rotate?

1. The reasons for the unsmooth of the slewing bearing installaton

1. Mounting holes. The threaded hole of the slewing bearing installation hole is not standardized, the threading is not complete, and the threading is defective, so that the bolt cannot be screwed in.

2. The center diameter and chord length of the mounting hole exceed the tolerance too much, such as 3-5mm, which will cause the bolt to fail to pierce.

3. The size of the positioning hole and the step are out of tolerance and cannot be matched.

4. The bearing after heavy load has a rotating dead center or an ellipse, which makes it unable to operate normally.

5. The slewing bearing installation is not in the direction of the installation design drawing, resulting in the opposite direction of the taper pin, which has potential safety hazards.

6. The slewing bearing installation part interferes, such as tooth top interference, there is a phenomenon of gnawing teeth, and some parts conflict with each other.

7. The design of negative clearance is unreasonable, which leads to the phenomenon of inclined force, partial load and clearance after installation.

8. The design of the equipment structure is unreasonable, which leads to the failure of normal debugging.

2. The possibility that the slewing bearing installation is difficult to rotate or cannot rotate

1. Newly purchased products are inflexible in idling

Please check the production date of the slewing bearing. If the weather is cold for a long time (such as more than half a year), it is possible that the temperament such as salt mist is mixed into the raceway,

which will cause the rotation resistance to double and make the slewing bearing not work well (cold areas, winter is more prominent ) Remedy:

If it can run after afterburning and there is no other abnormality, it can be used normally.

2. Inflexible operation after slewing bearing installation

It may be that the surface of the main engine device and the surface of the slewing bearing installation are not well matched, so that the axial clearance of the slewing bearing after the installation cannot compensate for the deformation of the slewing bearing,

the slewing bearing is in a state of negative clearance, and the rolling elements are difficult to operate in the raceway (sometimes accompanied by abnormality). sound) or the large and small gears are poorly meshed;

or there are foreign objects stuck in the large and small gears. Remedy: re-process the plane of the host device to make the device plane meet the requirements;

re-adjust the meshing backlash of the large and small gears according to the requirements, especially pay attention to the gear beat position;

check to ensure that there is no foreign matter in the meshing position of the large and small gears; replace a slewing bearing with a slightly larger clearance .

3. Inflexible operation during use

The sealing strip is damaged, causing foreign objects to enter the raceway (such as poor working conditions, immersion of dust in the raceway, etc.) the deformation of the isolation block leads to difficulty in operation;

there are hard objects or other conditions at the meshing of the large and small gears, such as broken teeth.

Slewing Bearing/slewing ring bearing:the gear accuracy grade and the slewing bearing installation.

1.The gear accuracy grade of the slewing bearing and the feasibility and practicality of gear grinding

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Generally, the slewing bearing can have external and internal teeth, and the tooth profile can be helical, half-tooth, tooth surface quenching, and tooth surface tempering. In order to improve the gear accuracy level, tooth grinding is a separate process. Special instructions in the drawings.

So, the subject of this article, talk about the gear accuracy grade of the slewing bearing and the feasibility and practicality of gear grinding.

It should be understood that the reason why the rotary slewing bearing is used as a rotating mechanism is that it is easy to maintain and maintain, and the other is to use the low-speed and heavy-duty characteristics of the slewing bearing. In other words, the slewing bearing itself, as a precision component, is actually a customized product.

The gear accuracy grade is usually indicated as 10/9/8, and 7/6/5 generally requires gear grinding. The gear grinding process is to achieve precise meshing and precise pointing and positioning. Most do not need to grind the teeth because the cost of grinding the teeth is very high.

2.Slewing Ring Bearing Installation Tips to Ensure Optimal Performance

While slewing ring bearings do perform heavy-duty functions often under the worst possible conditions, they must be treated as delicate instruments to ensure their accuracy and a long operating life. Following the installation procedures precisely is critical to ensuring the best possible performance.

While slewing ring bearings often perform heavy-duty functions under the worst possible conditions, they must be treated as delicate instruments to ensure their accuracy and a long operating life. Following the installation procedures precisely is critical to ensuring the best possible performance.

Slewing rings are vital to supporting heavy loads that must rotate to other positions in a precise manner. Devices that use slewing ring bearings include:

Massive construction cranes
Large solar tracking devices
Some types of military armament

Since the rotation of the mechanism demands accuracy to assure effectiveness and safety, the installation of slewing ring bearings requires precision to expect proper operation.

Complying with every detail of the instructions is necessary for proper installation and function. Here are some installation tips that highlight the need for proper cre of this paowerful yet sensitive equipment.

MAKE SURE SLEWING RINGS ARE SHIPPED AND STORED PROPERLY

When the manufacturer prepares slewing ring bearings for shipment, they are lightly lubricated, wrapped for delivery and packed in individual specialized containers.

After receiving, store the unit in a clean, dry place in the original packing material until installation. Ensure that all areas around the slewing ring bearings are free of grit and dirt.

ALWAYS INSPECT FOR DISTORTION OR INTERFERENCE FROM DEBRIS

Each component of the slewing ring bearing must be clean, unobstructed by even the smallest foreign object and precisely oriented. Problems may arise during operation when friction or out-of-balance situations occur. The load may tend to concentrate in a particular area, creating a malfunction or improper wearing.

ENSURE SUPPORT SURFACES ARE LEVEL AND STRONG

The supporting surfaces must be machined smooth and perfectly level. They need to have sufficient strength to remain rigid during operation to eliminate any possible vibration or buckling due to imbalance.

CHECK THE RING CIRCULARITY

Protecting all elements of the slewing ring bearing is essential. If the circularity of the slewing ring is compromised during shipment and handling, the slewing drive will not work properly. Slewing ring bearings should be transported and stored in purpose-built crates and kept in a horizontal position at all times.

Ensure that the lifting apparatus or sling used is sufficiently robust and capable of lifting and holding the ring during installation. The external gear teeth must have protection to guard against damage from any collision with other surfaces.

Slewing ring equipment should not be in storage for longer than six months. The raceways must always be kept greased and free of rust.

PROPER SEALING AND LUBRICATION

Installers should specify integral seals on bearings and incorporate shrouding to protect the gears and bearings

As with most metal machine parts, proper lubrication is essential to smooth operations and long life. For slewing ring bearings and gears, this process is crucial. Equipment will come with operating instructions that will advise a recommended frequency for lubricating. Lubrication schedules depend on the type of equipment and the amount of use.

GEAR LUBRICATION

Immediately after assembly, you should lubricate the gear with either a brush or spray-on. Gear lube is recommended at least every three months, depending on how rigorously the equipment is used.

DOUBLE-CHECK THE INSTALLATION INSTRUCTIONS AND PERFORM TESTS BEFORE USE

Follow the manufacturer’s installation directions to the letter.

During installation, the slewing rings should be rotated while bolts are tightened to determine if any tight spots are developing. Also, recheck the bolt torque to identify any change due to settling.

Once the ring bearing is in position, check for any gear backlash and bearing torque before putting into operation. Deviations can indicate a problem with the mounting process.

3.SLEW RING BEARING LUBRICATION MISTAKES YOU SHOULD AVOID

Lubrication is essential for maintaining the integrity of a slew ring bearing. When bearings are optimally lubricated, they not only run safely, but also reduce the potential for premature failure. In order to ensure that slew ring bearings are properly maintained, the following mistakes should be avoided.

1. RELUBRICATING ON A YEARLY BASIS

Every slewing ring bearing has a recommended relubrication period and should be followed closely. These recommendations include the typical amount of lubrication needed for a reapplication as well as the most appropriate time interval.

It’s important to note that these recommendations can depend on application. For example, it is recommended that a slewing bearing is lubricated every 100 hours of operation. If the application involves continuous rotating, then the slewing bearing should be lubricated after 20 hours of continuous use. In addition, slewing bearings that are mounted on idle equipment, or those that live in storage, should be lubricated every six months.

Contact your slew ring manufacturer regarding your specific application in order to get the most accurate recommendation.

2. NOT USING THE PROPER LUBRICANT

Not all lubricants are created equal. If two incompatible greases are accidentally mixed, the reapplication process will be ineffective. The following chart depicts examples of recommended lubricants.

*Brand*	*Raceway*	*Gear*
Exxon	Ronex MP	Surret Fluid
Castrol	Molub-Alloy 220 ES	Optimol Viscogen 0
Mobil	Mobilux EP2	Mobiltac 375NC
Texaco	Multifak EP2	Crater 2x Fluid
Sunoco	Ultra Prestige 2 EP
Shell	Alvania EP2	Cardium Fluid M or H
Kluber	Centoplex 2 EP	Grafloscon C-SG 0 Plus
76 Lubricants	Unoba EP2	Gearite HDCF 4800

3. LUBRICATING TO THE POINT OF OVEFLOW

Although this is another misconception that varies by application, it is generally not recommended to lubricate slewing bearings so much so that the grease purges from the seal. The operating temperature and pressure within the cavity is likely to increase when excess grease is present. As a result, performance can be hindered.

4. ADDING ADDITIONAL GREASE WHENEVER BEARING MAKES NOISE

In some instances yes, your slewing bearing will need to be lubricated if it is making noise, but this is not true for all situations. Noisy slewing bearings can be a sign of internal damage as well. When internal damage occurs, extra lubricant will only provide temporary relief. Failure can occur if the root cause of the noise is not identified and remedied appropriately. If failure does occur, remove the slewing bearing as soon as possible and reach out to the bearing manufacturer to determine why the bearing was not compatible.

By avoiding the previously mentioned mistakes, you will be able to ensure that your slewing ring bearings are properly lubricated and performing as intended. If you have additional lubrication questions about your specific application, please reach out to us here.