Can you install the deep groove ball bearing?

1. When installing the bearing, it should be evenly stressed and cannot be hammered directly. For example, if the interference is large, the bearing should be placed in an air-heating furnace or oil furnace with automatic temperature control, and the heating temperature should be strictly controlled below 120°.

2. The bearing with nylon cage can work continuously for a long time under the temperature -40°-120°. It should not exceed 4 hours at 150°, and the short-term temperature should not exceed 180°.

3. The warehouse where the bearings are stored should be clean, dry and not allowed to be stored in the same warehouse with the chemical products. The relative humidity should not exceed 65%, and the bearings are not allowed to be stored on the ground.

4. The stock bearings should be cleaned every year for rust-proof packaging.http://www.zysbearing.com/

Which caused the frequent damage of rolling mill bearings?

After analysis of effective data, the main forms of rolling mill bearing damage are fracture, wear and pitting.

Damage form one: Fracture: inner and outer ring fracture, rolling element rupture, cage fracture

The outer ring fracture is mainly caused by the excessive load and the insufficient bearing pressure.

In addition to the cyclic load, the inner ring is connected with the roll neck by the interference fit during installation. There is a positive tensile peripheral stress. As long as micro cracks are formed on the inner ring, they will rapidly spread and then cause fracture.

In addition to the above reasons, another reason for the fracture is that the oil and gas supply in the roller box is insufficient or interrupted, causing the bearing to heat up and then lock, and then causing damage to the inner and outer rings, the cage and the rolling elements.

Damage form two:  How is wear and pitting caused?

Most of the wear is caused by the relative rotation of the roll neck and the inner hole.

There are two main reasons for pitting: the bearing material is unqualified, caused by improper heat treatment. Foreign matter enters into the roller box, and pitting occurs during the running of the bearing.

In addition, due to improper operation, the copper bracket is deformed. When the roller enters the bearing housing, the ball rubs against the inner sleeve and then scratches the inner sleeve, so that the roller is inflexible during operation, causing bearing failure.

The height of the roll gap on both sides of the rolling mill is inconsistent, which causes the bearing to be stressed at a certain point due to uneven force during the running of the roll, thus causing bearing failure.

The working principle of deep groove ball bearings

Deep groove ball bearings are suitable for high speed operation, low vibration and low noise, and they are extremely durable and require no maintenance. Deep groove ball bearings have the features of small friction coefficient, high limit speed, various sizes and forms, and they can be used in precision instruments, low noise motors, automobiles, motorcycles and general machinery. It is the most widely used type of bearing in the machinery industry. They mainly bear the radial load and can also withstand a certain amount of axial load. When it increases the radial clearance of the bearing, it has certain angular contact bearing performance and can withstand radial load and axial combined load.

The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. There are two types of deep groove ball bearings: single row and double row. The deep groove ball structure is divided into two types: sealed and open. The open type means that the bearing does not have a sealing structure. The sealed deep groove ball is divided into dustproof seal and oil proof seal. The dust seal cover material is stamped from steel plate, which is simple to prevent dust from entering the bearing raceway. The oil-proof type is a contact type oil seal, which can effectively prevent the grease inside the bearing from overflowing.

The type code of deep groove ball bearing is 6, and the double row deep groove ball bearing code is 4. It is the most common and widely used class 0 bearing. 

Full ceramic bearings are not hybrid bearings

Usually, people thought that bearings are actually hybrid bearings. So, today we will talk about the difference between full ceramic bearings and hybrid bearings? 

Ceramic Bearings

Full ceramic bearings consist of ceramic rings, ceramic balls, and synthetic cage made from PEEK or PTFE material or no cage at all. They are highly resistant to acids and alkalis, so they are suitable for corrosive environments. Silicon nitride (Si3N4) bearings can be heated to temperatures of 800°C without cage.

Full ceramic bearings are also non-magnetic, so they can be used in medical devices for strong magnetic field. However, the greater hardness of ceramic bearings also means greater brittleness, so they can not bear shock load. 

Hybrid bearings

Hybrid bearings are a mixture of ceramic and steel materials. They use ceramic balls, but are paired with metal inner and outer rings. Therefore they are suitable for higher speeds conditions. 

Despite the small difference in design, the requirements of hybrid bearings have big different from full ceramic bearings. For example, full ceramic bearings do not require lubrication, but hybrid bearings need unless they are used at very low speeds. Precision hybrid bearings with a high-speed cage are capable of very high speeds, so they can be used in machine tool spindles. 

ZYS can design the bearings for the customers with the technical requirements and working conditions.

Configuration type of common rolling mill bearings

(1) Spherical roller bearings.  The configuration of the early rolling mill bearings on the rolling mill is different from the present. At that time, two sets of spherical roller bearings were mainly installed side by side on the same roller neck. This configuration basically meets the production conditions at that time, and the rolling speed can reach 600 rpm.

(2) Four-row cylindrical roller bearing + thrust bearing. The inner diameter of the cylindrical roller bearing is tightly matched with the roll neck, and it can bear radial force.  The cylindrical roller bearing has advantages of large load capacity, high limit speed, high precision, easy processing, low production cost, convenient installation and disassembly and the inner and outer rings can be separated.  The thrust bearing bears axial force, and the specific structure type can be selected according to the characteristics of the rolling mill. While for heavy-duty low-speed, we can equip with thrust roller bearings to withstand the thrust load with a small axial clearance. When the rolling speed is high, it is equipped with angular contact ball bearings so that speed limit is high and the axial clearance can be controlled. This type of bearing configuration not only has long bearing life, high reliability, but also has many advantages such as high precision and easy control of rolling products. Therefore, it is widely used in wire rod mills, sheet mills, foil mills, and support rolls for cold rolling mills and hot rolling mills.

(3). Four-row tapered roller bearings. The tapered roller bearings can withstand both radial and axial forces, and no need to configure thrust bearings. The inner diameter of the tapered roller bearing is loosely matched with the roll neck. It is very convenient to install and disassemble, but sometimes it will cause sliding creep due to the loose fit. Therefore, the inner diameter is often processed with a spiral oil groove. This type of configuration is widely used in the working roll of four-roll hot rolling mill and a cold rolling mill, and roll for blanking machine, steel beam rolling mill.

If you want to know more, please visit http://www.zys-bearings.com/ or send e-mail to zysdong@gmail.com. 

Daily maintenance of bearings

Bearings are an important part of machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Maintenance work is the top priority for bearings to work properly, maintain performance, and extend life. Everyone should take it seriously.

Next, let's take a closer look at the daily maintenance work of the bearings.

First, keep the bearings lubricated and clean

Before inspecting the bearing, clean the surface of the bearing first and then remove the parts around the bearing. Pay special attention to the oil seal, which is a very fragile part. Please be careful when inspecting and disassembling the bearing to avoid damage to the part. If you have been experiencing bad symptoms when inspecting the oil seal of bearing and its surrounding parts, be sure to replace it to avoid damage to the bearing caused by a bad oil seal.

Second, to ensure the quality of bearing lubricants

The quality of the lubricant has a direct impact on bearing service life. The inspection method for the bearing lubricant is as follows: the lubricant is rubbed between the two fingers, and if there is a contaminant, it can be felt; or a thin layer of lubricant is applied on the back of the hand, and then the sealing is checked. Then it is to replace the lubricant of the bearing.

Third, the working environment of the bearing

When inspecting bearings, never expose them to contaminants or moisture. If the work is interrupted, cover the machine with a piece of oil-paper plastic or similar material. The working environment of the bearing is also very important. 

Fourth, the bearing seal

The purpose of bearing sealing is to prevent dust, moisture and impurities from entering the bearing, but also to prevent the loss of lubricant. A good seal ensures that the machine works properly, reduces noise and extends the life of the parts.

The above is the relevant introduction of the daily maintenance work of the bearing. It is mainly explained from four aspects. In fact, these four aspects are also related to each other. Therefore, bearing maintenance work is carried out closely around the four words of clean, lubrication, sealing and environment.

Installation and maintenance of slewing bearing

1. Slewing bearings require careful handling.
2. Slewing bearings should always be transported and stored in horizontal position and be stored in dry roofed areas.
3. Use eyebolts for horizontal handling. Impact, particularly in radial direction, must be avoided.
4. The surface of slewing bearing should be applied with anti-corrosion oil, and the anti-corrosion period is 6 months. Long storage (as backup, for example) periods will require special preservation.

Requirements on supporting structures

1. The support in the companion structures must be kept aligned to the track center.
2. In order to prevent local overload and ensure smooth rotation, the supporting structures should be processed to remove internal stress after all the welding procedures. The contact surfaces for the bearing should be machined carefully and should be within flatness tolerances.

General information about Bearing test machine

Bearing life test machine   

       Bearing life test results is an important index of comprehensive evaluation of bearing quality. It can reveal the quality level of bearing structure design, manufacturing process, material and lubrication etc.

      This series of machine is controlled by industrial computer automatically. The load, speed, operation time and other main parameters can be preset, and the machine can work according to the set procedures. The test machine can also monitor, record automatically on bearing load, temperature, vibration, motor speed, current and other parameters. When the testing bearing failure or something wrong with the test machine, the machine will alarm downtime and record down the reason automatically, to realize unattended and intelligent management.

    Auto bearing testing machine    

     This series of machine are realized the computer automatic control, monitoring test parameters, recording, alarm downtime and other functions.

     This series of machine test subject design is unique, simulation accurately, high machining accuracy, high components configuration, so as to ensure the stability and reliability of the bearing test.

    Sealed bearing testing machine   

     This kind of machine are often used to evaluate the bearing performance of a particular level and the durability of the bearing performance, such as the seal, friction, high-speed, high temperature resistance performance. Control mode can be automatic computer control or manual control.

    Bearing parts testing machine      

    A lot of experiments and data statistics show that when bearing fatigue failure, the most probability is roller failure. Therefore, steel ball contact fatigue testing machine and roller fatigue testing machine are used to test the fatigue life of rolling elements. And then study the internal relationship between rolling element's fatigue life, material, manufacturing process, finished product quality etc.

Three Methods for Identifying Bearing Faults

Bearing as a precision part of mechanical equipment, how to improve the productivity of the factory, the first mechanical equipment must be the best performance. And mechanical equipment performance use of one of the largest relationship-bearing. Therefore, the factory in production and processing, must be mechanical equipment in the bearing good inspection. For safety reasons. China bearing network sharing bearing fault identification method, we hope to help.

1. Recognizing by sound

     There is a need for a rich experience to identify the sound through sound . It must be adequately trained to recognize the bearing sound and non - bearing sound . To do this , it should be done as much as possible . The sound of the bearing can be clearly heard on the housing with a microphone or a listening stick .

2. Identifying by working temperature

      This method is a comparative identification method, which is only used in situations where the operation state is not too varied. For this reason, continuous recording of temperature must be carried out. When failure occurs, the temperature will not only rise. Irregular changes will also occur. It is advisable to combine this method with the sound recognition method.

3. Identified by the state of the lubricant

This method is especially effective for bearing or large bearing which can not be observed near by sampling analysis of lubricant, judging whether the lubricant is mixed with foreign body or metal powder according to the degree of dirt and whether the lubricant is not mixed with metal powder.

Method of Judging Grease Metamorphism

In order to provide better performance, the bearings are lubricated by lubricating grease, which can reduce the friction and temperature of the bearings, if the grease is bad. Not only does not play a related role, but is more adverse to the use of bearings, so we must learn how to buy grease to tell whether the grease has deteriorated.

  

Method of judging grease metamorphism

1. Oil flow observation method

    Take two measuring cups , one of the lubricating oil to be inspected , the other empty on the desktop , lift the measuring cup full of lubricating oil away from the table top 30 - 40 cm and tilt , let the lubricating oil slowly flow into the empty cup , observe the flowing condition , the quality good lubricating oil oil flow should be slender , uniform and continuous , if the oil flow is lost or slow , and there is large flow of oil , the lubricating oil has deteriorated .

2. Hand twisting

    Twisting lubricating oil between thumb and index finger repeatedly grinding, a better lubricating oil hand feel lubricity, less debris, no friction, if feel the sand between fingers such as a greater sense of friction, it shows that there are many impurities in the lubricating oil. New lubricating oil should be replaced if it cannot be used again.

3.Illumination method

     On sunny days, use a screwdriver to lift the lubricating oil at an angle of 45 degrees to the horizontal level. Compare the sunlight and observe the oil droplets. Under light, you can clearly see that the lubricating oil is good without debris and can continue to function. If there is too much debris, replace the lubricating oil.

4. Oil drop trace method

    Take a clean white filter paper, drop a few drops on the filter paper, after oil leakage, if the surface of black powder, with the hand touch has a sense of resistance, then the lubricating oil has a lot of impurities. Good lubricating oil without powder, touch dry and smooth with hands, and yellow marks.

Common faults and solutions for CNC machine tool spindles IV

Problem five:The spindle stops immediately after starts.

The cause of the failure and the solution:

1. System output pulse time is not enough: adjust the system's M code output time.

2. The inverter is in jog state: Refer to the instruction manual of the inverter and set the parameters.

3. The control components of the spindle line are damaged: check whether the contacts on the circuit are in good contact, check whether the DC relay is damaged which caused the contact can not self-lock. 

4. The spindle motor is short-circuited, causing thermal relay protection: find the cause of the short circuit and reset the thermal relay.

5. The spindle control loop does not have self-locking circuit, and the parameter is set to pulse signal output, so that the spindle can not operate normally: change the start and stop parameters of the system control spindle to the level control mode.

Problem six: the spindle rotation can not stop

The cause of the failure and the solution:

1. AC contactor or DC relay is damaged and uncontrollable: replace AC contactor or DC relay.

Common faults and solutions for CNC machine tool spindles III

Problem three: the rotating speed of the spindle without frequency conversion (shift spindle) is not controlled

The cause of the failure and the solution:

1. System has no S01-S04 control signal output: Check whether the system has shift control signal output. If no, it is system failure, replace the IC or send the factory for repair.

2. Connection line failure: If the system hasshift control signal output, check whether there is any open circuit or poor contact on each connection line, and check whether the DC relay or AC contactor is damaged.

3. The spindle motor is damaged or open circut : Check the spindle motor.

4. Machine is not linked: hang up the gear.

Problem four: the spindle has no brake

The cause of the failure and the solution:

1. Abnormal brake circuit or strong electrical components damage: Check whethr bridge stack, fuse or AC contactor is damaged; check if the high-voltage circuit is open.

2. Braking time is not long enough: adjust the braking time parameter of the system or inverter.

3. System has no brake signal output: replace internal components or send to the factory for repair.

4. The inverter control parameters are not adjusted: Check the inverter manual and set the inverter parameters correctly.

Common faults and solutions for CNC machine tool spindles II

Problem two: the spindle with the inverter does not turn​

The cause of the failure and the solution:

1. Mechanical transmission failure: Check whether the driving belt is broken or whether the machine tool is in neutral.

2. Three-phase power supply to the spindle is missing: Check the power supply and exchange any two power lines.

3. The inverter control parameters of the CNC system are not open: see the system manual to understand the inverter parameters and change them.

4. Line connection error between the system and the inverter: Check the connection manual of the system and the inverter to ensure the connection is correct.

5. The analog voltage output is not normal: Check whether the analog voltage output by the system is normal with a multimeter; check whether the analog voltage signal line connection is correct or the contact is good, and the analog voltage received by the inverter matches.

6. High-voltage control part is disconnected or component is damaged: Check whether the connection of each contact of the spindle power supply is reliable and whether the DC relay is damaged or the fuse is burnt out.

7. Inverter parameters are not adjusted: The inverter contains control mode selection, which is divided into inverter panel control spindle mode, NC system control spindle mode, etc. If NC system control mode is not selected, we can not control spindle with system; check if the relevant parameter settings are reasonable or change them if necessary. 

Common faults and solutions for CNC machine tool spindles I

Problem one: the spindle without frequency conversion does not turn

The cause of the failure and the solution:

1 Mechanical transmission failure: Check whether the driving belt is broken or whether the machine tool is in neutral.

2 Three-phase power supply to the spindle is missing or inverting: Check the power supply and exchange any two power lines.

3 Wrong circuit connection: Carefully refer to the circuit connection manual to ensure that the connection is correct.

4 The system has no corresponding spindle control signal output: use the multimeter to measure the system signal output terminal. If there is no spindle control signal output, you need to replace the relevant IC components or send it to the factory for maintenance.

5 The system has the corresponding spindle control signal output, but there is an open circuit or component damage in the power supply line and the control signal output line: use the multimeter to check the power supply circuit between the system and the spindle motor, and whether there is an open circuit in the signal control circuit; whether contact between the wires is not good; whether AC contactor or DC relay is damaged; check if the thermal relay is overcurrent; check if the fuse is burnt.

Method of Judging Grease Metamorphism

In order to provide better performance, the bearings are lubricated by lubricating grease, which can reduce the friction and temperature of the bearings, if the grease is bad. Not only does not play a related role, but is more adverse to the use of bearings, so we must learn how to buy grease to tell whether the grease has deteriorated.

  

Method of judging grease metamorphism

1. Oil flow observation method

    Take two measuring cups , one of the lubricating oil to be inspected , the other empty on the desktop , lift the measuring cup full of lubricating oil away from the table top 30 - 40 cm and tilt , let the lubricating oil slowly flow into the empty cup , observe the flowing condition , the quality good lubricating oil oil flow should be slender , uniform and continuous , if the oil flow is lost or slow , and there is large flow of oil , the lubricating oil has deteriorated .

2. Hand twisting

    Twisting lubricating oil between thumb and index finger repeatedly grinding, a better lubricating oil hand feel lubricity, less debris, no friction, if feel the sand between fingers such as a greater sense of friction, it shows that there are many impurities in the lubricating oil. New lubricating oil should be replaced if it cannot be used again.

3.Illumination method

     On sunny days, use a screwdriver to lift the lubricating oil at an angle of 45 degrees to the horizontal level. Compare the sunlight and observe the oil droplets. Under light, you can clearly see that the lubricating oil is good without debris and can continue to function. If there is too much debris, replace the lubricating oil.

4. Oil drop trace method

    Take a clean white filter paper, drop a few drops on the filter paper, after oil leakage, if the surface of black powder, with the hand touch has a sense of resistance, then the lubricating oil has a lot of impurities. Good lubricating oil without powder, touch dry and smooth with hands, and yellow marks.

General information of ZYS needle bearing

The needle bearing is roller bearing with a cylindrical roller, which is both thin and long with respect to its diameter. In spite of the smaller cross-section, the bearing still has a high load bearing capacity. The needle bearing is equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, L means the length of the roller), therefore its radial structure is compact. When the inner diameter size and load capacity are the same as those of other types, the outer diameter is the smallest, which is particularly suitable for a support structure in which the radial installation size is limited.

Structure type
This type of bearing has a radial needle and thrust full of ball, or with a thrust ball, or with a thrust cylindrical roller, or with the angular contact ball into one, can withstand unidirectional or two-way axial load. Can also be designed according to the user's specific structural requirements.
Materials
Needle roller material for the GCr15 bearing steel, hardened HRC60-65.
Inside and outside the ring material for the GCr15 bearing steel, hardened HRC61-65.
The cage material is made of high quality mild steel or reinforced nylon.
Application
It is widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other machinery and equipment, and mechanical design can be more compact and smart.

http://www.zys-bearings.com/bearing/the-needle-bearing.html

High temperature adaptability of bearings

The high temperature adaptability of the bearing and the heat treatment process of the bearing within an outer diameter of  240 mm ensure that it is dimensionally stable below 150 degrees. Special heat treatments are required if the operating temperature is above 150 degrees. These bearings are marked with the suffixes S1 to S4 (DIN 623).

S1: Maximum operating temperature 200 degrees

S2: Maximum operating temperature 250 degrees

S3: Maximum working temperature 300 degrees

S4: Maximum operating temperature 350 degrees

Bearings with an outer diameter＞240 mm are generally stable at temperatures below 200 degrees. The bearings use the cages made of glass fiber reinforced nylon 66 and can be stably operated at working temperatures below 120 degrees. When this kind of bearing is lubricated with oil, if the oil contains additives, the life of the cage may be shortened. When the temperature exceeds 120 degrees, the aged lubricant will also shorten the life of the cage. Therefore, you should pay attention to observe and replace the lubricant as scheduled.

The allowable temperature of sealed bearing also depends on the filled grease and the requirements of the contact seal. Sealed bearings are lubricated with specially tested high quality lithium grease. This grease can withstand high temperatures of 120 degrees in a short time. If the stable operating temperature reaches 70 degrees or higher, the life of standard lithium grease will be shortened.

ZYS has special technical team to develop the lubricant to meet the different kinds of bearing. If you want to know more, please check http://www.zys-bearings.com/bearing-materials/lubricant/antirust-oil-for-bearing.html.

The importance of lubricant on bearing torque

Rolling element bearings, such as ball bearing and roller bearings, support the load required to carry out a machine’s function at a much lower friction than a fluid bearing alternative. This reduces the power required to drive the equipment, lowering the cost of moving the load and the energy required to operate the equipment.
Bearing torque is the force required to overcome internal friction to start or maintain rotation of the bearing. This frictional torque is generally increased with a larger bearing, increased load or increased lubricant drag.

How can we get the right bearing torque?
Many applications require the bearing to spin easily with extremely low frictional torque, without generating excess heat. Dry lubricant is one way of meeting these low torque requirements. Despite being solid, dry lubricants can reduce friction between two surfaces without the need for oil or grease.
Instrument oils are another option for low torque requirements. They will often produce very low torque levels especially at very low speeds.

There are many oils and greases to choose from, and there are other factors to consider aside from torque, such as contamination, speed or corrosion resistance. With the right lubrication type, correct fill level and consideration of load, you’ll be able to source bearings with the correct frictional torque for the specific application.

Bearing components

1. Bearing part

One of the parts that make up the rolling bearing, but does not include all the accessories.

2. Bearing ring

Including the annular part of radial rolling bearing with one or several raceways.

3. Bearing washer

Including the annular part of thrust rolling bearing with one or several raceways.

4. Flat ring

A detachable flat washer with its inner or outer portion as a rib for the outer or inner ring of a radial cylindrical roller bearing.

5. Oblique ring (separable)

A separable ring with "L" shaped cross section with its outer portion as a rib of the inner ring of radial cylindrical roller bearing.

6. Middle retaining ring

A separable ring in a roller bearing with two or more rows of rollers for isolating the two rows of rollers and guiding the rollers.

7. Stop ring

A single port ring with constant cross-section, mounted in an annular groove, axially positions the rolling bearing within the housing or on the shaft.

8. Lock ring

A single-mouth ring with a constant cross-section, mounted in the annular groove as a retaining ring to hold the roller or cage in the bearing.

9. Spacer

It is a toroidal part used between two bearing rings or bearing washers or between two half bearing rings or between two half bearing washers to maintain a defined axial distance between them.

10. Sealing ring

An annular cover consisting of one or several parts, fixed to a ferrule or washer of the bearing and in contact with another ferrule or gasket or forming a narrow labyrinth gap to prevent leakage of lubricating oil and invasion of foreign objects.

11. Dust cover

It is an annular cover, usually stamped from a thin metal plate, fixed to a ferrule or washer of the bearing and extending toward the other ring or gasket to cover the inner space of the bearing, but not in contact with another ferrule or gasket. .

12. Guard ring

A part attached to the inner ring or shaft ring that utilizes centrifugal force to enhance the ability of the rolling bearing to prevent foreign objects from entering.

13. Rolling body

A ball or roller that rolls between the raceways.

14. Cage

A bearing component that partially wraps around and moves with all of the rolling elements to isolate the rolling elements and also generally guides the rolling elements and retains them within the bearings.

The working principle of Induction heaters

Induction heaters use the principle of power frequency short circuit current heating bearing, and adopt advanced electronic temperature control circuit, then the temperature can be settled automatically according to the input values in the range of 0-200℃. Set up the highest upper limited temperature in the process of heating, once the temperature reach the highest value, the induction heater can cut the heating circuit automatically and give overtemperature alarm. The heaters use the intelligent dual digital display mode to set up, control and display the temperature. Set time and actual time can be displayed in dual digital display mode. Therefore, user can know the temperature and heating time of the heated inner ring anytime and anywhere. In the heating process, only bearing is hot while the temperature of heater itself keeps normal.

Get to know slewing bearing

Slewing bearing, that is turntable bearings, which can bear large radial load, axial load and tilting moment. For application field, slewing bearings are widely used in large-scale rotary device engineering, mining machinery, metallurgy, wind power, ship, port, petroleum, chemicals, light industry, medical equipment, food, vehicles, robotics, aerospace, radar and military industries. Generally speaking, slewing bearing has lubrication holes, mounting holes and sealing devices, to meet the various hosts under various working conditions. In addition, slewing bearing has some features, such as compact structure, easy to guide the rotation, easy to install and easy to maintain. 

Slewing bearing can be divided into crossed roller wheel bearing, double row different ball slewing bearing, four-point contact ball turntable bearing, roller and ball combination slewing bearing and other types bearings. According the different structure, they can also be divided into no gear type, external gear type and internal gear type.

Bearing failure cause analysis program

1. Determine the most complete operating condition information.

2. Related photos in the process.

3. Alignment of used and unused lubricant samples.

4. Mark the bearing and its location in the device.

5. Carefully disassemble the bearings to avoid unnecessary extra damage.

6. Inspect other machine components to determine incidental damage.

7. Confirm the bearing base and seat.

8. Confirm the condition and distribution of the lubricant in the bearing. Extract additional samples if possible.

9. Clean the bearings and components, if possible, record the logo, brand and full name.

10. Realize the analysis of bearings and corresponding parts. Take other photos.

11. Compare the failure mode standard photos provided by the International Standards Organization 15243 and/or the bearing manufacturer to determine the cause of the failure.

12. Determine the necessary corrective actions necessary to avoid the same failure again.

13. Protect and retain faulty bearings for future comparisons.

14. Example: Some of the above cases will be shown

15. Interactive exercises: Some interactions with bearing failures will be shown during the workshop

16. Conclusions and recommendations. http://www.zys-bearings.com/

The Role and Use of Tapered Roller Bearings

Tapered roller bearings are to bear radial primarily diameter, the axial joint load. Rolling bearing capacity depends on the angle of the outer ring, the bearing capacity of the larger angle. This kind of bearing is separable bearings, roller bearings according to the number of columns is divided into single row, double row and four row circular cone roller bearings separately. Tapered roller bearing clearance adjustment to users in the installation; double row and four row tapered roller bearing clearance has been in the factory according to user requirements given, the user does not have to adjust.

    Tapered roller bearings have conical inner ring and outer ring raceway. Tapered rollers are arranged in between. Projection lines on all conical surfaces converge at the same point in the bearing axis. This design makes tapered roller bearings particularly suitable for bearing composite (radial and axial). Load. The axial load capacity of the bearing is mostly determined by the contact angle α; The greater the α angle, the higher the axial load capacity. The greater the e value, the greater the contact angle, the greater the applicability of bearing to axial load.

    Tapered roller bearings are usually of separate type, i.e. conical inner ring assemblies consisting of inner rings with roller and cage assemblies can be mounted separately from conical outer rings (outer rings).

Tapered roller bearings are widely used in automobile, rolling mill, mining, metallurgy, plastic machinery and other industries.

    The main reason is that the emergence of tapered roller bearing device in the process are: bearing device, when assembling the emergence of the inner ring, the outer ring of skew; or perhaps the emergence of load device and assembling charge into the enemy ranks are in the process of the final formation. That is the emergence of the bearing device conical roller bearing should be in accordance with the job specification to stop, not many results, such as to form or not when the device, will emerge the scar formation of linear bearing raceway surface and rolling bearing surface. Device of deep groove ball bearing with bearing using the indirect reaction when precision, life and function.

    Although the quality of tapered roller bearings is good, the rolling bearings are precision parts, and their use should be carefully carried out accordingly. No matter how high performance bearings are used, if they are not used properly. The expected high performance will not be obtained. The following considerations are noted for the use of bearings:
(1)、Keep the tapered roller bearings and their surroundings clean. Even small dust that is invisible to the eyes can have a bad effect on the bearings. So keep the surroundings clean so that the dust does not intrude into the bearings.

(2)、 Give taper roller bearing a strong impact in use, will produce scars and indentation, become the cause of the accident. In serious cases, will crack, fracture, so we must pay attention to.

(3)、Use the right operating tools. Avoid using existing tools. Use the right tools.

(4)、Attention should be paid to the corrosion of tapered roller bearings.

     When operating the bearing, the sweat on the hand can be the cause of rust. Use clean hands and wear gloves as far as possible. Tapered roller bearings use hearing to identify irregular movement is a very common method. For example, using an electronic stethoscope to detect a zero piece of abnormal noise is used by an experienced operator. Bearings in good working condition emit a low whine. A sharp hissing tapered roller bearing, squeak and other irregular sounds usually indicate that the bearing is in bad working condition.

1, tile surface corrosion: spectra of non-ferrous metal element concentration anomaly; there are many nonferrous metal components of sub micron particle wear ferrography; oil water exceed the standard, exceed the standard value.

2, the journal surface strain spectrum: iron iron line cutting abrasive or black metal oxide particles, temper the surface. 

3, shaft neck surface corrosion: spectral analysis of iron concentrations found abnormal, submicron particles have many iron components of iron in the spectrum of lubricating oil or water exceed the standard.

4 value exceed the standard, the surface strain: iron spectrum is found in cutting abrasive, abrasive composition for nonferrous metals. 

5, tile back fretting wear the spectral analysis showed that iron The concentration is abnormal, and there are many submicron wear particles of iron in the iron spectrum, and the water and acid value of the lubricating oil are abnormal. Under the condition of liquid lubrication , the sliding surface is separated from the lubricating oil without direct contact , the friction loss and the surface abrasion can be greatly reduced , and the oil film also has certain vibration absorption capacity

     A sharp creak noise may be due to inadequate lubrication caused. The bearing clearance can also cause inappropriate metallic sound. Dent taper roller bearings on the track will cause vibration, resulting in smooth crisp sound, if the installation of the percussion scars will produce noise, the noise will follow bearing speed vary. If intermittent noise, said rolling element may be damaged, tapered roller bearings, this sound is when the damage occurred in the surface is rolled out, bearing if hissing sound pollution often caused serious damage to the bearing will produce irregular and loud noise.

   Bearing damage can be detected by hearing, but usually the bearing must be replaced immediately by this time. Therefore, better methods such as using electronic condition monitoring instruments. The operation of tapered roller bearings is broken in advance.

http://www.zys-bearings.com/bearing/automotive-bearing/single-row-tapered-roller-bearings.html

Ensure the lubrication quantity

It is important to ensure the proper fill quantity of lubrication in order that all contact surfaces are provided with a suitable lubricating film over the operating life. Both over-lubrication and under-lubrication are very harmful. With over-lubrication, there is an increase in the internal friction of the component as excess lubricant is moved through the free space. This results in increased heat generation and then the shorter service life. With under-lubrication, not all contact surfaces are supplied with the proper quantity of lubricant. This may lead to wear and then shorten the bearing service life. 

The purpose of the lubricant is to provide the contact surfaces with a consistent lubricating film, thick enough to prevent metal-to-metal contact. The correct lubricant quantity is determined by the design, operating speeds, reservoir volume, and the extent of sealing or shielding found in the application. http://www.zys-bearings.com/

Online Automatic Packaging Machine

Technological Parameters

1、Processing range: 5mm-30mm; Angle 1°0’-4°30’

2、Processing Rate: Take the rollers, of which the diameter is 18mm as an example: 120 pieces/min;

3、Total Power of the Machine Tool: 3.5Kw.

4、External Dimension of the machine tool(Length*Width*Height): 3200X800X1100mm.

5、Total weight of the machine tool: About 1200Kg.

6、Maximum working pressure of pneumatic system: 0.6Mpa.

7、 Realizing the functions of automatic sorting, counting, automatic packing and so on.

8、 The equipment consists of the feeding area, the sorting area, the packing bag heating area, the operation area and discharge hole, etc.

9、The electrical program is controlled by PLC and is set and operated through a touch screen. The touch screen consists of four interfaces.When the power switch is started, it shows "welcome to use", namely the first interface, hinting to touch "operation interface" template to enter the second "user operating interfaces". According to all the hints of this interface, with safe operation only, it is easy to enter the third "basic setting interface" and the fourth "temperature control interface.   Each interface can be set voluntarily  according to the actual needs to realize automatic packaging. http://www.zys-bearings.com/