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high quality china slewing bearing suppliers 2022

What are the main failure modes of slewing bearings?

Due to its own quality and external conditions, the performance of the bearing will change due to its own quality and external conditions. When the performance index of a bearing is lower than the use requirements and affects the normal operation, This is called bearing damage or failure.

The main failure modes of slewing bearings:

1. Metal corrosion occurs

If the bearing lacks lubrication during use, it will be oxidized and rusted by the air. And don’t soak in water. The material of the slewing bearing is stainless steel.

When taking the bearing, wash off the sweat on the hand, apply mineral oil before taking the operation, especially in summer and rainy season, pay special attention to rust prevention.

2. Excessive load or improper use

Bearings cannot exceed their own load during use. Just like if the car pulls too heavy goods, it is easy to cause damage to the slewing bearing. Therefore, in general, the bearings of trucks are more easily damaged than cars, and the reason is that many of the parts are overwhelmed.

3. The slewing bearing clearance is too small

For example, the front wheels of the car use inclined-push slewing bearings, and the clearance of the bearings needs to be adjusted. If the clearance is too large, it will cause abnormal noise, deflection, or wheel shaking. If the clearance is too small, it will accelerate the wear of the bearing.

For old slewing bearings, it is necessary to check whether there are burrs, scratches or cracks on the surface of the ball (column), and whether the radial clearance and axial clearance are qualified; for new bearings, it is necessary to check the bearing type first. is it right or not.

slewing bearing Alt.

4. Use inferior slewing bearings

Some bearings are produced by some small factories whose production technology cannot meet the requirements. The accuracy of the shaft or bearing box is not accurate, and the steel of the bearing is directly pressed for production without proper treatment. Therefore, the service life of the produced bearing is not long.

5. Improper installation operation

When the bearing is installed, it is necessary to follow the installation steps of the bearing, and it cannot be installed and disassembled with brute force. Whether the bearing is installed correctly is closely related to the service life of the bearing.

When the bearing is installed, it is not allowed to punch or hit the bearing directly with a hammer. Try not to take it directly by hand. The sweat on the hand will also cause the bearing to rust.

6. Foreign body intrusion

When installing or using the bearing, you need to use special tools, try to avoid things such as cloth or short fibers, so as to prevent fibers from entering the bearing and causing damage.

If the installation personnel use the copper rod knock-in method when installing the bearing, the axial force of the bearing may be uneven, which will cause problems such as deformation of the cage, damage to the rolling elements, and enlargement of the clearance.

During the knocking process, copper powder may fly into the bearing cage, making the bearing prone to failure.

2.How to correctly judge and deal with the peeling of the slewing bearing raceway and the broken teeth of the ring gear

Due to the manufacturing quality problems such as material pores or uneven hardness and depth of the hardened layer of the interlayer raceway, or some external reasons,

the hardened layer of the raceway is peeled off or the teeth of the gear ring are broken during the use of the slewing bearing, so that the equipment cannot work normally.

For raceway peeling, first make a correct judgment. There is peeling, which is generally not easy to see on the outside. According to our experience, the following conditions indicate that the raceway has peeling layers:

when the main engine rotates under load, there is an abnormal “clack-clack” sound at the raceway, the rotation speed is uneven or the speed in a certain direction is obviously slowed down and accompanied by There is slight vibration;

the temperature rise of the rotary motor is too high or the current is too large; the keyway of the rotary motor and the hydraulic coupling or coupling is crushed, etc.

After peeling occurs, it must be repaired in time. Otherwise, the peeling area will expand, so that the entire slewing bearing will be scrapped.

The repair method is: first take out the rollers or steel balls in the slewing bearing to separate the inner and outer rings; then clean the raceways with gasoline;

then use a grinder (grinding wheel) to carefully remove the needle peeling area of Microsoft Corporation. Grind off the hardened layer of the cracks that have occurred around, and smooth the bottom of the peeling layer;

preheat the place where the raceway needs to be repaired with a welding torch, and use a medium carbon steel electrode for welding (the electrode must be dried before use, and followed by The welding layer should be slightly higher than the surface of the raceway by 1-2mm;

if the peeling layer is deep or the area is large, the welding should be applied in layers and sections, and the base metal temperature should not be too high to cause deformation;

this avoids Rapid cooling produces welding cracks, and thermal insulation measures should be taken immediately after welding to gradually cool him. After cooling, use a grinder to smooth the repair welding layer so that it is slightly higher than the surface of the raceway.

Gradually grind the repair welding layer with whetstone or metallographic emery cloth to make it the same height as the normal surface of the raceway.

Use the corresponding original curvature. Test the samples until they are qualified; clean the raceways and rollers (steel balls) with gasoline, apply grease, and complete the assembly.

The reason for the broken teeth of the rotating ring gear may be the quality problem of the cast section of the tooth base material (such as blisters, interlayers and other defects, which will obviously weaken the bending resistance of the gear);

stones or steel bars are embedded in the meshing of the gear teeth during use. The hard object increases the local bending stress of the gear teeth and breaks.

The repair method is local repair welding or tooth insert repair. The method of local repair welding is: first grind off the residual crack matrix of the damaged part with a portable grinding wheel, clean it with gasoline (oil);

use a welding torch to preheat this part, After reaching the fixed temperature, use a medium carbon steel electrode to push and weld the prototype of the tooth on the damaged part of the tooth, so that it is 1-2mm higher than the tooth surface of the party; until the tooth shape meets the requirements.

When a whole tooth of the rotary gear ring is damaged, it can be cut along the root of the tooth, and then the tooth root is filed into a fixed shape, and then the next tooth is stored on the same type of waste ring gear,

processed into the corresponding shape of the base metal, and then placed into the groove, and use the toothed template to clamp the positioning.

In order to ensure the consistency of the tooth pitch, and after the double-wire chuck is used to increase the value, it is welded with low carbon steel around the tooth. Use a file and other tools to smooth the weld to ensure that the meshing of the gear teeth is stabilized.

China Factory Wholesales Turntable Bearings

1.Comparison of the use of turntable bearings and geared slewing drives for truck-mounted cranes

Crane truck, referred to as crane (crane truck), is a hoisting mechanism installed on a cargo truck to achieve the purpose of loading or hoisting goods. The lifting mechanism can lift, retract and rotate, and can flexibly lift the goods and place them in the designated position.

The rotation of the hoisting mechanism is realized by the turntable bearing or the slewing drive. The above picture is a common hoisting mechanism with a slewing bearing installed. The outer tooth turntable bearing is equipped with a yellow protective cover to protect the operator and the equipment.

In the picture, near the slewing mechanism, the grease flows around and quickly loses, the equipment is dirty, and the grease is polluted and lost, resulting in frequent refilling of grease, high maintenance costs, and high equipment failure rate.

turntable bearing Alt.

Straight-toothed rotary drive, also called geared rotary drive, is composed of turntable bearings, gears, housings, adapter flanges, support turntable bearings, seals and other components. A rotary speed reducer that bears axial force, radial force and overturning moment at the same time and has a certain reduction ratio, referred to as rotary drive.

The structure of the spur gear rotary drive determines that the spur gear drive has the characteristics of dustproof and waterproof, compact design, convenient installation and use, stable and reliable, and low failure rate.

During the use of the truck mounted crane with gear type rotary drive, the equipment is kept clean, brand new, with low failure rate, no loss of grease, not easy to be polluted, low maintenance frequency, stable operation and long life.

beat china industrial positioners slewing bearing manufacturer

1.How to quickly and accurately measure the diameter of the slewing bearing channel?

When the slewing bearing is to grind and fit the sleeve at the end, the diameter of the channel must be tested to avoid repeated trial installation. Then, how to measure the diameter of the channel of the slewing bearing? There are many ways to detect the diameter of the slewing bearing channel.

There are calipers plus two steel balls, and there are also measurement methods to estimate the wall thickness, but some of the measurement errors are too large, and some of them are more complicated to detect.

If it is improved on the basis of the pipe ruler and made into a ball-end ruler, the diameter of the channel of the slewing bearing can be quickly and accurately measured on the machine tool.

slewing bearing Alt.

1. Making the measuring head

Generally, there are ready-made fixing rods at both ends of the pipe ruler. It is only necessary to change the shape of the measuring head. Cut the steel ball into two halves with wire cutting, and one half is welded on the measuring head by tin welding (or argon arc welding), and the other half is fixed on the measuring head. On the dial indicator head, and then install it on the fixed rod connecting the pipe ruler to measure.

2. Measurement method

Replace the fixed measuring head of the pipe ruler and the measuring head of the dial indicator with the steel ball used for assembling the slewing bearing channel, use the block gauge to align the diameter of the channel, calibrate the dial indicator of the tube ruler to zero, and measure At this time, the steel ball at the fixed end of the pipe ruler is positioned on one side of the slewing bearing channel, and the dial indicator is on the other side of the channel.

With the steel ball at the fixed end as the fulcrum, rotate the pipe ruler along the plane of the slewing bearing channel to find the turning point. The reading of the dial indicator is the measured value of the diameter of the channel. If the value reaches the required value, the channel will be ground and the next piece can be processed. If the size has not reached the required value, continue processing until the size meets the requirements.

3. Measurement accuracy verification

Comparing the bearing clearance calculated based on the measurement results of the ball end gauge with the actual bearing clearance after assembly, the error of the bearing clearance value calculated by the ball end gauge measurement is within 0.01mm, which proves that the ball end gauge measurement can meet the machining requirements of high-precision slewing ring bearings. testing requirements.

4. Detection advantages and disadvantages

(1) Testing on the machine tool does not require removing the parts from the machine tool for trial installation, which greatly improves work efficiency

(2) The measurement accuracy is high, which can meet the processing and testing requirements of small clearance slewing bearings

(3) This method can also be used for the detection of the channel diameter of the crossed roller slewing bearing

(4) The measuring tool needs to be self-made, the testing method must be skilled, and the requirements for testing personnel are relatively high.

cross tapered roller bearings price

1.Cross Tapered Roller Bearings

XR series crossed tapered roller bearings are designed to provide high rotational accuracy and rigidity in a small space, resulting in significant material cost savings.

This type of bearing is to install two sets of bearing raceways and rollers together at right angles, with adjacent rollers facing the opposite direction, spacer blocks are installed between the rollers, and support gaskets are also installed on the rollers. , which allows the two half-columns of the rollers to fit into the same space.

The angle and tapered geometry of the bearing allows the effective span of the bearing to be several times larger than the actual width of the bearing itself.

XR series bearings are suitable for high speed machine tool applications such as vertical boring machines and vertical grinding machines. It is also especially suitable for many equipment with limited space and high requirements for rotation accuracy.

roller bearing Alt.

Size range:

2463.800 mm (4.000 in. 至97.000 in.)

2819.400 mm (11.000 in. 至111.000 in.)

Folding Design Features:
The XR series has two rows of tapered rollers that are vertically crossed on the 90° V-shaped hob face through spacers, and can withstand radial loads, axial loads, and other loads in all directions.

Line contact on the raceway and roller construction provides maximum rotational accuracy, high stability and greater tilt stiffness. Adjustable preload design extends bearing life, maximizes stiffness and provides minimal runout.

Nylon spacers have low inertia and low operating torque. The components are made of surface carburized steel or electroslag remelted bearing steel with good impact resistance.

Folding application range:
Precision rotary indexing tables for machine tools, vertical and horizontal boring machines, vertical grinding machines, rotary surface grinding machines, large gear hobbing machines, gun and radar rotary tables, large radio and optical telescopes, rotating cameras.

steering pivots and continuous casting machines, Height-constrained pivot microscope stages, pole center pivots, rotary bogies, welding stands, rotary assembly jigs, industrial robots, precision rotary tables, medical instruments, metrology instruments, IC manufacturing equipment.

model
THK crossed roller bearingStandard Crossed Roller Bearing RB series models are as follows:

RB7013 RB8016 RB9016 RB10016 RB10020 RB11012 RB11015 RB11020 RB12016 RB12025 RB13015 RB13025 RB14016 RB14025 RB15013 RB15025 RB15030 RB16025 RB17020 RB18025 RB19025 RB20025 RB20030 RB20035 RB22025 RB24025 RB25025 RB25030 RB25040 RB30025 RB30035 RB30040 RB35020 RB40035 RB40040 RB45025 RB50025 RB50040 RB50050 RB60040 RB70045 RB80070 RB90070 RB1000110 RB1250110

INA crossed roller bearings SX series models are as follows:

SX011814 SX011818 SX011820 SX011824 SX011828 SX011832 SX011836 SX011840 SX011848 SX011860 SX011868 SX011860 SX0118/500

INA crossed roller bearing XSU series models are as follows:

XSU080168 XSU080188 XSU080218 XSU080258 XSU080318 XSU080398 XSU140414 XSU140544 XSU140644 XSU140744 XSU140844 XSU140944

THK crossed roller bearings RA series models are as follows:

RA10008 RA11008 RA12008 RA13008 RA14008 RA15008 RA16013 RA17013 RA18013 RA19013 RA20013

THK crossed roller bearing RE series models are as follows:

RE7013 RE8016 RE9016 RE10016 RE10020 RE11012 RE11015 RE11020 RE12016 RE12025 RE13015 RE13025 RE14016 RE14025 RE15013 RE15025 RE15030 RE16025 RE17020 RE18025 RE19025 RE20025 RE20030 RE20035 RE22025 RE24025 RE25025 RE25030 RE25040 RE30025 RE30035 RE30040 RE35020 RE35025 RE40035 RE40040 RE45025 RE50025 RE50040 RE50050 RE60040

THK crossed roller bearing RU series models are as follows:

RU124G RU148G RU178G RU228 RU297 RU445 RU228X RU297X RU445X RU228G RU297G RU445G

IKO Crossed Roller Bearing CRB series models are as follows:

CRB8016 CRB9016 CRB10016 CRB10020 CRB11012 CRB11015 CRB11020 CRB12016 CRB12025 CRB13015 CRB13025 CRB14016 CRB14025 CRB15013 CRB15025 CRB15030 CRB16025 CRB17020 CRB18025 CRB19025 CRB20025 CRB20030 CRB20035 CRB22025 CRB24025 CRB25025 CRB25030 CRB25040 CRB30025 CRB30035 CRB30040 CRB35020 CRB40035 CRB40040 CRB40070 CRB45025 CRB50025 CRB50040 CRB50050 CRB50070 CRB60040 CRB60070 CRB600120 CRB70045 CRB70070 CRB700150 CRB80070 CRB800100

LYMC Precision Crossed Roller Bearing

Crossed Roller Bearing

A crossed roller bearing is a special type of bearing with a split inner ring and a rotating outer ring. Since the divided inner ring or outer ring is installed with the roller and spacer, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to install the cross roller ring.

Since the rollers are arranged in a cross, only one set of Cross Roller Rings can withstand loads in all directions, and the rigidity is 3 to 4 times higher than that of conventional models.

At the same time, since the inner ring or outer ring of the crossed roller bearing is divided into two structures, the bearing clearance can be adjusted, and even if a preload is applied, high-precision rotational motion can be obtained. Moreover, due to its special structure, it is usually used as a joint bearing in industrial robots.

1.product description

Their rollers are arranged at right angles to each other at intervals between the inner and outer wheels. They can bear loads from all directions at the same time (such as axial, thrust or momentum loads, etc.).

Because the rollers are in linear contact with the track surface, the possibility of elastic deformation of the bearing under load is very small.

This type of bearing is widely used in such occasions as industrial automatic robots, working machinery and medical facilities, etc., where high rigidity, tightness and high speed are required to ensure accuracy.

In a crossed roller bearing, since the cylindrical rollers are arranged perpendicular to each other through spacers, a single crossed roller bearing can withstand loads in all directions, including radial load, axial load, and moment load.

The size of the inner and outer rings is minimized, especially the ultra-thin type is a small size close to the limit, and has high rigidity, so it is most suitable for the joint part or rotating part of industrial robots, the rotary table of machining center.

It is used for robot rotating parts, precision rotary tables, medical equipment, measuring instruments, IC manufacturing equipment, etc.

crossed roller bearing Alt.

2.Use features

For crossed roller bearings, since the divided inner ring or outer ring is installed with rollers and spacers, it is fixed with the crossed roller collar to prevent separation from each other, so it is necessary to install the crossed roller collar. Simple.

Since the rollers are arranged in a cross, only one set of Cross Roller Rings can withstand loads in all directions, and the rigidity is 3 to 4 times higher than that of conventional models.

1. Excellent rotation accuracy

The internal structure of the crossed roller bearing adopts the rollers arranged at 90° perpendicular to each other.

There are spacers or spacers between the rollers, which can prevent the rollers from rubbing against each other due to the inclination of the rollers.

In addition, there is no contact phenomenon or locking phenomenon of one side of the roller; at the same time, because the inner and outer rings are divided structures, the gap can be adjusted, and even if a preload is applied, high-precision rotational motion can be obtained.

2. Simplified operation and installation

The outer ring or inner ring, which is divided into two parts, is fixed together after the rollers and cages are installed, so it is very easy to install.

3. Bear large axial and radial loads

Because the rollers are arranged perpendicular to each other on the 90° V-groove running surface by spacers.

4. Significantly save installation space

The size of the inner and outer rings of the crossed roller bearing is minimized, especially the ultra-thin structure is a small size close to the limit, and has high rigidity, so it is most suitable for the joint parts or rotating parts of industrial robots, and the rotation of machining centers.

Widely used for worktables, manipulator rotating parts, precision rotary tables, medical instruments, measuring instruments, IC manufacturing equipment, etc.

5. High speed capability

6. Reduced shaft length and machining cost, limited change in geometry due to thermal expansion

7. Using nylon divider, low moment of inertia, low starting torque, easy to control angle indexing

8. Optimized pre-tightening force, high rigidity and high running accuracy of guide rollers

9. Carburized steel provides excellent impact resistance and surface wear resistance

10. Simple but well lubricated

Classification and Model Series of Domestic Crossed Cylindrical Roller Bearings

RB type (outer ring split type)

The RB series is the basic type of the crossed cylindrical roller bearing. The inner and outer rings are minimized in size. The structure is that the outer ring is a split type and the inner ring is an integral design. It is suitable for parts that require high rotation accuracy of the inner ring. .

RE type (inner ring split type)

The RE series model is a new type produced by the design concept of the XRB type, and the main dimensions are the same as the XRB type. Its structure is that the inner ring is a split type, and the outer ring is a one-piece design, which is suitable for parts requiring high rotation accuracy of the outer ring.

RU type (inner and outer ring integrated type)

The RU series model does not need a fixed flange and a support seat due to the machining of the mounting holes. In addition, since the integrated inner and outer ring structure with seat is adopted, installation has little effect on performance, so stable rotation accuracy and torque can be obtained. Can be used for outer and inner ring rotation.

RBC type (outer ring split type)

The RBC series model (corresponding to the CRBC series of IKO company) has a structure that the outer ring is a split type, the inner ring is an integral design, and a full complement roller bearing with a cage. It is suitable for parts that require high rotation precision of the inner ring.

CRBH type (inner and outer ring integrated type)

The inner and outer rings of the CRBH series are of one-piece structure for rotation of the outer and inner rings.

RA type (outer ring split, ultra-thin type)

The RA series model is a compact model that reduces the thickness of the inner and outer rings of the RB type to the limit. Ideal for applications requiring a lightweight, compact design, such as robotic and manipulator rotation.

SX type (outer ring split type)

The structure of SX series models is similar to that of RB series. The outer ring is a two-part structure, connected by three spring snap rings, and the inner ring is designed as one piece, which is suitable for places requiring high rotation precision of the inner ring.

XRU08 type (integrated type of inner and outer rings)

The XSU08 series is similar to the RU series, and the inner and outer rings have been processed with mounting holes, so there is no need for a fixed flange and a support seat.

Due to the integrated inner and outer ring structure with seat, installation has little effect on performance, so stable rotation accuracy and torque can be obtained. Can be used for outer and inner ring rotation.

First thrust angular contact ball bearing

The contact angle of thrust angular contact ball bearings is generally 60°. Commonly used thrust angular contact ball bearings are generally bidirectional thrust angular contact ball bearings, which are mainly used for precision machine tool spindles.

It has the advantages of high precision, good rigidity, low temperature rise, high speed, and convenient assembly and disassembly.

Second deep groove ball bearing

Structurally, each ring of a deep groove ball bearing has a continuous groove-type raceway with a cross-section of approximately one third of the equatorial circumference of the ball.

Deep groove ball bearings are mainly used to bear radial loads, and can also bear certain axial loads. When the radial clearance of the rolling bearing increases, it has the properties of an angular contact ball bearing and can bear axial loads alternating in two directions.

Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient, high limit speed and high precision, and is the preferred bearing type for users when selecting models. Deep groove ball bearings have a simple structure and are easy to use. They are the type of bearing with the largest production volume and the widest application range.

Third thrust tapered roller bearing

Since the rolling elements in the thrust tapered roller bearing are tapered rollers, the rolling busbar and the raceway busbar of the washer meet at a certain point on the axis of the bearing, so the rolling surface can form pure rolling and high limit speed. for thrust cylindrical roller bearings.

Features: Thrust tapered roller bearings can withstand unidirectional axial loads. The type code of thrust tapered roller bearing is 90000 type.

Introduction to Crossed Cylindrical Roller Bearings

There are two types of crossed roller bearings, one is crossed cylindrical roller bearings, the other is crossed tapered roller bearings; crossed roller bearings have a long history of application abroad, but only recently in China.

It has only entered the public’s vision for a few years, and it is widely used due to its own particularity and incomparable advantages over other bearings.

bulk slewing bearing series

1.How to reduce slewing bearing tooth noise

The slewing bearing can stably support the equipment for slewing motion, also known as the turntable bearing. The mechanical equipment needs to be rotated without the transmission. The slewing bearing can be made of external teeth or internal teeth, and the rotation of the slewing bearing is realized through the gear transmission.

In practical applications, the force of the slewing bearing is different, the speed of rotation is also different, and the teeth of the slewing bearing are also different. In the process of gear transmission, the contact between the gear and the ring gear of the slewing ring will generate noise, so how to reduce the noise of the slewing ring?

1. Control the tooth precision. Through long-term practice, we found that if we want to reduce the tooth noise, the tooth precision needs to be controlled at 7-8 grades. The higher the rotational speed, the higher the gear tooth precision requirements. Gear, tooth accuracy should be controlled within 7 grades.

2. Reduce the frequency of start-stop or forward and reverse rotation of the gear. Frequent start-stop or forward and reverse rotation will cause the gear to vibrate too fast, and the vibration will generate noise. The faster the vibration, the louder the noise. Reduce noise.

3. Reduce the impact load. The impact load will make the vibration frequency and torsion direction of the gear different, which will cause vibration in the circumferential direction, which will form a smooth noise. Reducing the impact load can reduce the noise.

4. Reduce the occurrence of resonance, which will generate high-frequency noise. When the motor rotates at a low speed or at a certain speed, the equipment will resonate, causing the gear and ring gear to oscillate at a high frequency and the two oscillating objects will contact. High-frequency noise will be generated, which can generally be reduced by changing the speed or adjusting the position of the equipment.

5. Increase the roughness of the tooth surface. If the roughness of the tooth surface is very poor, it will cause point contact on the tooth surface, and noise will be generated when the high point contact is made. If the roughness of the tooth surface is increased, the tooth surface will be in line contact, and the noise will be very high.

6. Increase the lubrication of the tooth surface. Insufficient lubrication will lead to increased friction, and noise will be generated when the tooth surface is rubbed. Sufficient lubrication can reduce friction and effectively reduce noise.

slewing bearing Alt.

2.Correct selection can increase the service life of the slewing bearing

1. Use environment

In the selection stage of the slewing bearing, the use environment should be described in detail. The following are several common use environments:

Wet environment: Water vapor should be prevented from entering the channel and corroding the bearing surface. Long-lip seals or multi-lip seals should be selected, or even multiple sets of seals should be added.

The large contact area between the seal and the bearing can effectively prevent the entry of water vapor, and the bearing surface is anti-corrosion. Treatment such as galvanizing, etc., prevents the bearing from rusting and corroding, resulting in fracture failure.

High temperature environment: use high temperature resistant materials, metal retainer or glass fiber retainer for retainer, high temperature resistant rubber such as fluorine rubber for sealing, and high temperature grease for grease.

Dusty environment: The main way to effectively prevent dust from entering the channel is the selection of seals, which is the same as the selection method in wet conditions.

2. Speed

The description of the rotation speed of the slewing bearing in the selection stage is not the number of revolutions per minute that we usually talk about. In fact, the slewing bearing is not used at a constant speed in many occasions. In the design, we will provide the limit speed, slewing The bearing can not be used for more than the corresponding specified time under the state of the limit speed.

Due to the high speed, the bearing temperature will be too high and the heat dissipation will be poor, resulting in channel burns, rolling element burns, and damage to the slewing bearing. Choose a high-speed slewing bearing. Bearings shall meet, integral copper retainers, high temperature seals and grease.

3. Load

There are various types of slewing bearings to choose from according to different load conditions. The load is divided into axial load, radial load and overturning moment.

Under the condition that the diameter of the slewing bearing remains unchanged, increasing the diameter of the rolling element can effectively increase the bearing size. The overall retainer can make the force of the rotating bearing more uniform.

In the selection stage of the slewing bearing, the description of the working conditions is very important. The more detailed the description, the more perfect the engineer’s selection and design, and the more suitable for the customer’s use.

bulk slewing ring

1.What is the reason for the overturning and shaking of the slewing ring?

With the rapid development of the machinery industry, slewing rings have been widely used in marine equipment, construction machinery, light industrial machinery, metallurgical machinery, agricultural machinery and other industries. In the process of installation and use, improper use or maintenance of the slewing ring may bring about various problems.

1. The mounting bolts are loose, resulting in excessive overturning and shaking during work. When the slewing ring is shaken, the connecting bolts should be considered first. All the connecting bolts of the inner and outer rings should be checked immediately to see if there is any looseness. If there are any, tighten them according to the torque requirements.

2. The rigidity of the steel structure supporting the slewing ring is insufficient, and elastic deformation occurs when the slewing bearing is under heavy or eccentric load, resulting in the overall overturning and shaking of the slewing bearing. This problem is solved by reinforced steel structure.

3. Check whether the operation is seriously overloaded. Overloading will also cause the slewing bearing to shake too much, so it must be operated strictly and reasonably according to the regulations.

4. Long-term overload or severe eccentric load operation will cause the raceway to be crushed by the rolling elements, resulting in excessive clearance beyond the normal range. If such a situation occurs, the problem is more serious, and it is necessary to contact the slewing bearing manufacturer to solve it in time to ensure the normal use of the bearing.

slewing ring Alt.

In order to ensure the normal use of the slewing ring bearing, the use and maintenance should be carried out in strict accordance with the “Installation and Operation Manual”. If there is a serious phenomenon of overturning and shaking during use, it must be stopped in time for inspection to prevent long-term sick operation to the slewing ring bearing. cause more damage.

2.What problems will affect the service life of the slewing ring?

Slewing ring is an important core component of equipment rotation. If the slewing bearing fails during the operation of the equipment and cannot rotate normally, it will cause equipment downtime and production paralysis.

It is generally very troublesome to replace the slewing ring, so everyone generally chooses a slewing bearing with reliable quality. The bearing is installed on its own equipment. After the slewing ring is installed, everyone hopes that the slewing bearing can work stably and reliably, and the longer the service life, the better. What are the factors that affect the life of the slewing bearing?

1. The problem of the equipment itself

1. The rigidity of the equipment installation foundation is insufficient. When the slewing ring is running under heavy load, the rigidity of the equipment installation foundation cannot provide a good support for the slewing ring, resulting in elastic deformation of the slewing bearing, uneven force when the slewing bearing rotates, and long-term use. It will cause damage to the slewing bearing and affect the service life.

2. The flatness of the installation foundation is not good. There will be a gap between the slewing ring and the installation foundation during installation. The correct way is to use a gasket with a suitable height to level the gap, but the operator often ignores this during installation and use. ,

In this case, the slewing bearing will warp and deform after the bolt is pressed, causing the channel to be deformed. After the deformation, the channel and the steel ball are not in good contact, and the clearance value is not uniform and the rotation is inflexible, which affects the use of the slewing bearing life.

2. Overload operation

When the slewing bearing is designed, the bearing capacity has been clarified, such as how much load and how much overturning moment it can bear. If the actual load exceeds the bearing capacity of the slewing bearing during use, it belongs to overload operation.

During overload operation, the load on the steel ball exceeds the limit load, and there will be collapse blocks, fatigue spalling, and craters in the raceway. The collapse will cause serious damage to the slewing ring.

It is possible that a short-term overload operation will cause devastating damage to the slewing bearing, which will seriously affect the service life of the slewing bearing, and overload operation may easily lead to safety accidents.

3. Pollution

Pollution can also lead to premature damage of the slewing bearing. Pollution means that dust particles, water, etc. enter the bearing raceway, or foreign matter enters the tooth meshing of the slewing ring. Damage to the slewing bearing, contaminants will also cause the slewing bearing to corrode, resulting in the deterioration of the grease, which will shorten the life of the slewing bearing.

4. Lubrication

The lubrication system can reduce the friction coefficient when the slewing bearing is running, achieve very small rolling friction or sliding friction, and also prevent the slewing bearing from rusting. Damaged teeth and lack of long-term lubrication are one of the main causes of premature failure of slewing ring bearings.

high quality china slewing ring

1.Slewing ring Installation

When you get LYMC slewing ring, please mount slewing ring as instructions below:
(1)Require the installation surface has sufficient strength and rigidity.
(2)Clean bearing and surface of the components, each surface can not have corrosion.
(3)The mounting surface should have locating pin or locating mouth, to prevent the bearing ran to each other.
(4)After contact with the mounting surface, you should check fit clearance with a feeler, the gap can be filled with plastic or a padded to prevent deformation of the bolt tightening.
(5)When installing, ensure that the bearing quenching soft belt should be located in the non-load bearing area or not often load area or load minimum area.
(6)Bearing mounting bolts must be of high strength bolts, according to the loading conditions, select the appropriate intensity level.
(7)Installation washer should adopt flat washer to ensure bearing pre load uniformly.
(8)Bolt preload requires sufficient strength, the preload force is 0.7 times to the bolt material yield limit. Best installed using a torque wrench to ensure uniform force and improve quality of the installation.
(9)Tighten bolts should adopt a “star” cross or symmetrical diagonal tightening way, first pretension and then follow the strength requirements and tighten the bolts.Tighten the bolts needs a torque wrench .
(10)For toothed products,must do the gear backlash detection before tighten the mounting bolts. To ensure the minimum or maximum diameter (with logo) of the gear ring beating meet the design requirements (available 0.05 ~ 0.3mm feeler gauge calibration) .

Slewing ring installation related parameters requirements
(1)Mounting surface roughness is less than Ra12.5.
(2)The maximum allowable values of the installation surface flatness can be determined according to actual working condition, but the flatness change must be uniform increasing or decreasing, within the scope of the circumference of a circle, not allowed to appear more than two (including two) peak, and 100 mm face runout is not allowed within the scope of more than 0.015 mm
(3)Maximum value on the radial direction inclination of the mounting surface is 0.04mm .
(4)Prestressing force of bolt installation must be determined according to the strength level of the bolt,the pre load force is 0.7 times to the bolt material yield limit.

requirements of slewing rings

Structures with slewing bearings normally require design types which are able to transmit all occurring loads with one bearing. These are normally axial, radial and tilting moments.These bearings must furthermore be suited to withstand the complete spectrum of operating conditions, as for example

• High and low temperatures including temperature fluctuations
• Overpressures and negative pressures
• Deformations of the companion structure
• Weight limits
• Limitation of the frictional torque
• Low maintenance
• Corrosion resistance
• Magnetoresistive behaviour
• Open center to run through supply lines or as access opening
Design and dimensioning
The bearings are individually designed and dimensioned for every application, this means that the buyer is not required to customize to specified geometries of catalogue bearings and characteristics but the bearing can be designed according to the customer’s structure and the specification.

slewing ring Alt.

2.Heat Treatment of Slewing ring Steel

Heat treatment of slewing bearing steel is to put solid metal or alloy into certain medium then undergoes three process: heating, heat preservation, and cooling to change steel organization and get required performance.

Different from other processing technology (such as forging, casting, welding, machining), purpose of heat treatment is not to change shape and dimension of steel but to change internal organization and performance of steel.

Heat treatment is alternately and repeatedly used among cold working, hot working, and other manufacturing process of mechanical parts or dies. According to its application, Heat treatment usually divided into pre-heat-treatment and final heat-treatment, and location of processing line as bellow :forging/casting→pre heat treatment→machinery (rough) processing →final heat treatment→mechanical (fine) processing.

Final heat treatment, such as quenching+tempering, etc, known as the heat treatment that enables the workpiece to meet the performance requirements under use condition. Pre heat treatment, such as annealing, normalization, known as the heat treatment that eliminates defects caused by former process or get organization and ready for subsequent machining and final heat treatment.

3.The correct storage method for slewing ring

Slewing rings are coated with anti-rust oil , and wrapped with a film in the factory. Such a package is usually valid for 3-6 months antirust.As long as the relative humidity does not exceed 60% of the storage compartment , the temperature changes within(20 ± 10), slewing ring general can store about a year (in the original packaging in good condition ) .

After long-term storage , grease lubricating properties of slewing bearings’ raceway filled may reduce.Before using the slewing bearing,they need to be filled with a new grease filling, storeroom should also avoid vibration and shaking.

For slewing rings ( turntable bearings ) not stored in their original packagings they should be kept well, to protect against corrosion and contamination .

For large slewing rings should be on flat, and inner and outer rings both should be supported. It should be stacked flat isolation between slewing rings.

best selling four-point contact ball slewing bearing

1.What factors are related to the service life of the four-point contact ball slewing bearing?

It is widely used in many construction machinery (such as excavators, etc.) or equipment platforms (such as drilling platforms, etc.).

Operators will consider its durability more when purchasing four-point contact ball slewing bearing, because slewing bearings have a longer service life, which can save costs and avoid affecting the production process due to maintenance or replacement of bearings.

Factors affecting the service life of four-point contact ball slewing bearing:

1. Design Factors

Whether the data of the four-point contact ball slewing bearing is compatible with the matching equipment during the design has a great relationship with the service life of the bearing.

For example, the diameter, number, effective length of rolling contact, radian and size of the contact surface of the bearing rolling element, etc.

2. Material factors

For four-point contact ball slewing bearing to ensure reliable quality, material control is the foundation. Because the quality problem caused by the material itself is a flaw, it cannot be remedied by technology in the later stage.

Such as the martensite in the quenched steel, the impurities, gas, cracks in the steel during the bearing production process.

3. Manufacturing process factors

During the manufacturing process of the four-point contact ball slewing bearing, due to technological or technical problems, the bearing parts hardness, surface burns, bumps and scratches, roughness, production accuracy, bearing clearance and other problems will affect its service life.

4. Selection factors

The selection of the slewing bearing should be matched with the equipment, and the load, hardness, operating environment and other factors of the bearing should be emphasized to ensure that the bearing runs the bearing and avoid unnecessary damage to the bearing.

5. Assembly factor

The assembly factors of the four-point contact ball slewing bearing mainly include installation accuracy, selection of assembly tools, whether there are impurities mixed in the installation process, assembly position of parts, assembly clearance, lubricant selection and filling amount, etc.

Strictly assembling according to relevant standards can reduce the wear, overheating, noise and other phenomena of the bearing, which is also directly related to the running quality and service life of the bearing.

6. Working environment and load

People work more efficiently in a comfortable environment. Long-term overloading will cause physical damage, and the same is true for machinery and equipment parts.

For the slewing bearing, the working temperature and the cleanliness of the working environment all affect the service life of the bearing; the bearing has its rated load during production, and if it is overloaded for a long time, its performance and service life will be adversely affected.

7. Maintenance

People say that “three points of use, seven points of nourishment” is actually very reasonable. Regular inspection and maintenance of slewing bearings, cleaning and lubrication can reduce bearing wear and prolong their service life.

four-point contact ball slewing bearing Alt.

2.What is the production process of four-point contact ball slewing bearing?

Production process of slewing bearing

1. Steel raw material cutting
The raw material commonly used for slewing ring bearings is carbon-chromium bearing steel that is hardened as a whole, and the slewing ring is made of surface-hardened steel, generally made of 50Mn steel.

First, the billet should be cut according to the expected size of the bearing, and the carbide saw blade with high hardness, wear resistance, strength and toughness should be used for cutting bearing steel.

2. Billet forging
The billet forging is to heat the billet in a heating furnace and forge it into a round cake shape. The purpose is to ensure the reliability and life of the bearing. After the raw material is forged, the bearing ring blank is formed.

3. Forging ring
The steel billet is forged into a ring-shaped steel ring by using a ring rolling machine, and the internal structure of the steel can be improved by forging, so that the steel material has more strength, plasticity and impact toughness.

4. Rough turning
Put the steel ring after the ring into the machine tool, carry out rough turning, turn out various groove raceways, fix the steel ring on the gear milling machine, cut the teeth, and provide conditions for the later grinding machine processing.

5. Heat treatment
Heat treatment is also called quenching.

Generally speaking, the heat treatment process is to carry out high temperature treatment on the bearing ring after forging and turning, which can affect the uniformity of carburization in the bearing ring and improve the wear resistance and hardness of the bearing.

6. Drilling
When drilling the mounting hole on the end face of the steel ring, pay attention to the center and cutting angle before opening the hole. You can choose a drilling machine, a hand-held electric drill and a hand-operated drill for operation.

7. Fine grinding
Fine grinding is to dress the fine parts of the bearing. Fine grinding can affect the rotation flexibility of the bearing and the machining accuracy of the bearing surface. The raceway surface of the steel ring is finely turned again to modify the deformation caused by the previous process.

8. Assembly and packaging
Assemble the processed parts; the assembled finished bearings are coated with anti-rust oil, sampled for quality inspection, packaged and packaged, and then enter the storage or sales process.

slewing gear factory

1.Selection and Practical Application of Clearance of Precision Slewing Gears

The precision slewing gear can rotate smoothly to obtain an ideal runout value. Generally, when designing and manufacturing, the clearance value will choose small clearance, zero clearance, and negative clearance.

The corresponding clearance value is generally 0 to 0.05. ≤0, -0.05 to -0.01, the corresponding preloads are: no preload, light preload, and heavy preload.

During processing, we can measure the channel size according to the method of measuring the channel size of the slewing bearing, and calculate the clearance value (whether positive or negative) according to the measurement data, and then check the calculated clearance value after the processing is completed.

The positive clearance is directly measured with a dial indicator, and the negative clearance is used to measure the starting torque of the slewing gear. According to the size of the starting torque, the size of the interference of the slewing bearing is judged.

The starting torque is also a must know in the use of the slewing bearing. A value of , which determines the selection of slewing gear reducer and motor.

To measure the starting torque of the slewing bearing, it is necessary to measure the starting force of the slewing bearing first, and a dynamometer is required. Since the maximum starting force occurs at the moment when the slewing gear is about to rotate, a force measurement that can record the maximum value of the measurement is required. meter to measure the driving force of the slewing bearing.

Starting torque=starting force x lever arm, the starting force can be measured with a dynamometer, we generally install a bolt on the outer ring hole of the slewing bearing, and use a dynamometer to measure the starting force of the slewing drive at the bolt, and the distribution of the bolt holes in the outer ring The radius of the circle is the arm, and the starting torque of the slewing bearing is calculated from the starting force and the arm.

For the same slewing gear, the difference in starting torque can reflect the size of the clearance value of the negative clearance slewing bearing. The larger the starting torque, the smaller the clearance value and the greater the preload.

The selection of the clearance value should also consider the situation of the customer’s equipment. The smaller the clearance value of the slewing bearing, the higher the requirements for installation and use.

Due to the small deformation, the small deformation of the slewing bearing can be offset by the clearance when the clearance is large, and the slewing gear can rotate normally after installation, but if it is a small or negative clearance, the slewing gear has no extra clearance to resist the small deformation.

If the slewing bearing is deformed, it will be stuck, rotated poorly, or even stuck, resulting in damage or failure to use.

slewing gear

2.How to improve the tooth machining efficiency of the slewing gear?

The slewing ring bearing is a large bearing that operates at low speed and heavy load. Usually the inner ring or outer ring has teeth. It is used to connect large components that require relative rotation. It is widely used in automated industrial machinery, construction machinery, wind power equipment, port machinery and other fields. ,

In the whole cycle of the slewing bearing from the forging to the finished product until it is sent to the user, the tooth processing process takes up a lot of time, and the length of the delivery time depends to a large extent on the processing efficiency of the slewing gear teeth.

In recent years, due to the country’s strong investment in infrastructure, new energy equipment and other fields, the market demand for slewing ring bearings has also increased sharply, and the supply is often in short supply.

On the other hand, there are many domestic manufacturers of slewing ring bearings. Minimizing costs on the premise of quality is the key for enterprises to stand out in the fierce market competition.

Gear machining is the longest time-consuming process in the production process of slewing bearings, and it has always been one of the most important factors restricting the production efficiency of slewing bearings. The traditional slewing gear tooth machining usually has two methods: gear shaping and gear hobbing.

In order to adapt to the improvement of processing accuracy and production efficiency requirements, gear hobbing and gear shaping technology are constantly developing in the direction of full numerical control, high speed, high precision, and intelligence, but the processing efficiency has not yet reached the ideal state, especially the processing of internal teeth. Only the gear shaper can be used, the cutting amount of each feed is small, and the processing efficiency is low.

In recent years, a machining method of CNC high-speed tooth milling has been gradually promoted in the slewing gear industry. There are two types of internal teeth and external teeth, which are processed by the profiling principle.

with high processing efficiency and large feed amount, suitable for large diameter, large Modular slewing bearing processing, especially internal gear processing, is 5-8 times more efficient than traditional gear shaping, which greatly shortens the production cycle of slewing bearings.

Gear milling, gear hobbing, and gear shaping have their own advantages and disadvantages in terms of processing efficiency and equipment cost. In the case of sufficient market demand, the efficiency of gear milling is better than that of gear hobbing and gear shaping, and the cost of gear milling is also lower than that of gear hobbing and gear shaping.

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