The support of national policy on the flanged ball bearing

Chinese high-end bearings based on underdevelopment, Twelfth Five year development plan has been introduced to put forward clearly,crane bearing ， developing countries will play a guiding role of industrial policy to support the bearing industry.（ flanged ball bearing ）

  A guiding role in the country, bearing industry access threshold will be increased, high capacity of low-end products will be controlled, research and development of high speed bearing will enter a rapid stage.

LYHY high speed bearings domestic competitive advantage

Development of bearing industry in China has made certain achievements, but there are problems that can not be ignored, the most prominent is the low-end products, high-end products still rely mainly on imports.

  A serious gap between the development of miniature ball bearings and China's machinery and equipment. It is gratifying, some have certain accumulation, and is committed to innovation of the enterprise has the breakthrough in the development of high bearing product.

  For example, specializing in R & D and production of P4, P2 level high precision bearing Luoyang LYHY high precision bearings Co., ltd..

  At present, flanged ball bearing , machine tool spindle bearings,high speed bearing the company's market competitive advantage obviously, especially machine tool bearings, product quality has to be imported products with equivalent.

Solution of miniature ball bearings overheating temperature

Because of the different heating reason of miniature ball bearings, the solving way is different, here is a method of solution for the miniature bearing overheating temperature.

• Filling grease method, the so-called filling grease method is regularly to the working surface of the bearing to fill in the amount of grease,which is one of the most commonly used grease lubrication way.

• The oil cup method, the oil cup is arranged in the bearing seat by screw cap type oil cup or pressure oil cup, periodically rotating the cover or using a gun will grease injection. It is also a common way of lubricating grease

• The pressure for fat method, thin section angular contact bearings pressure grease method is to rely on the lubricating grease pump grease. You should use grease with good fluidity.

• Centralized grease, centralized grease through the grease pump method, at the same time for the fat to each deep groove ball bearings and other components.

  Meanwhile,thin section bearing at this time the grease should use of lubricating grease flowing sacrifice, good oxidation resistance and corrosion resistance,which is also a kind of pressure for fat method.

The big three models of flange bearings

Since flange bearing are designed to increase  accuracy of position, there are thousands and hundreds models availability.Each designed for applicability of particular ball bearing functions and requirements.
When selecting a high speed bearing, the dimensions should suit the diameter of the shaft, and they are thus available in a myriad of sizes. The largest differentiating factor between flange bearings is the number of bolts (mounting holes) on the mechanism.
Double-bolt flanges
These flanges are available either in a wing-shape or in a diamond shape, which have two mounting holes, (usually elongated for simple, user-friendly adjustment). They are engineered to be repositioned and aligned for the best fit of shaft
Three-bolt flanges,these flanges are round, which have three equidistant mounting holes.
They are engineered to be repositioned and aligned for the best fit of shaft.

Four-bolt flangesThese flanges are square shaped, which have four equidistant mounting holes. For the larger number of positioning bolt-holes, they are more stable than their double-bolt counterparts,thus have a greater load-capacity. They are engineered to be repositioned and aligned for best fit of shaft.

  Flange linear ball bearing often made from cast iron or thermoplastic material. But some manufacturers produce flange bearings of  plastic. The polymer bearings offer a more cost-effective option to metal flanges. They are backed by a thin construction to compensate for the lost width,maintaining the stability and temperature resistance offered by their metal counterparts.

Motion mechanism of flange bearing

Flange bearing especially engineered to provide a precise mounting fit for ball bearing,which executed through axial location of the bearings' shaft ends, stabilizing the position of bearings and consequently maximizing the load support. When utilizing a miniature ball bearing where the shaft axis is perpendicular to the mount, flange bearing facilitate rotary or linear movement.
There are many kinds of flanges, whose designs and  cages are engineered to suit their corresponding ball bearings. in order to optimize their loading and speed capacities, allow the two devices to function in accordance. The flange bearing is screwed in relation to the shaft axis. Thus the mechanism is comprised of an insert attached to a relatively flat housing structure.
Flange bearing is usually equipped with  easily install spherical ball that offers a pivoting angle so as to relieve misalignment. The characters of bearing are  highly sturdy, maintenance-free, dirt-resistant, water-resistant, and able to adapt to an array of room temperatures.

The failure reason of miniature bearings

The failure of the ball in the flanged ball bearing in about 40% are caused by dust, dirt, debris pollution and corrosion. Pollution is usually caused by incorrect use and poor use environment, it also causes torque and noise problems.
Miniature ball bearings produced by the environment and pollution of the failure can be prevented, and observed by the naked eye is simple can determine the production of this kind of failure reason. As long as the use and reasonable installation, denudation of miniature bearing is easy to avoid. Erosion is characterized in miniature bearing ring raceway on the left indentation produced by impact load or incorrect installation.
Erosion is usually occurs in the load exceeds the yield limit of material. If not installed correctly so that a load across the miniature bearing ring will produce erosion. Miniature bearing ring on the pressure pit will produce noise, vibration and the additional torque.

Application of miniature bearing

Miniature ball bearings are suitable for all kinds of industrial equipment,  small rotary motor high speed bearing low noise field, such as,

  Office equipment, micro motor, instrument, laser engraving, small clock, soft drive, pressure rotor, dental drill, the hard disk motor, stepping motor, VCR drum, toys, computer cooling fan, currency-counting machine, fax machine and so on related field.

Flanged ball bearing show

Many miniature ball bearings have flanges as options to their configurations. The flange is designed for mounting and positioning,which is especially true for miniature and instrument bearings and applies to other ball bearing types.

  To get various types of flanged ball bearings click the next lists,

  slewing-bearings,flanged-bearing

Relevant parts of requirements of the high speed bearing host

Rotating system of high speed bearings  require  precision dynamic balancing.Installation bearing part of shaft and hole  is higher than the general requirements for the dimensional accuracy and the position accuracy .

  LYHY bearings, especially the verticality of coaxiality and shoulder block seat hole or shaft neck, and in consideration of these problems, we must  pay attention to the high speed factors bearing in operation and high temperature factor.

  Shaft bearing system requires high rigidity,  as far as possible the light quality. In order to overcome this contradiction,we can  take measures  to improve the supporting stiffness ,such as reducing the surface roughness and improving the surface strengthening  , or using  hollow shaft to reduce the quality of the system etc.

The coordination of high-speed bearing

high-speed bearings with clearance due to the requirements of the high speed for both high precision bearings  and  high temperature bearing, so in consideration of its coordination and clearance, to take into account the following two points:

(1) changes in the size and hardness changes when the temperature rose from     ambient temperature;
(2) force line change and shape change under high-speed centrifugal force caused by.

In short, in the high precision ball bearings and high temperature conditions, and with clearance from the selection of want to keep a bearing on the accuracy and performance, this is difficult.

In order to ensure the bearing after installation of the rolling deformation is small, the amount of interference can not KOYO 7319AC angular contact ball bearing interference fit get too large, and high speed centrifugal force and high temperature thermal expansion, or set off with the normal surface pressure.

Or relax the mating surface , so the amount of interference must considering the above two kind of factors under the carefully calculated, the effective amount of interference may be invalid for the high-speed bearing in the normal speed.

high speed bearing

High speed, medium speed and low speed bearing, not on speed set but in line speed set. Smallbearings motionless tens of thousands turn not high-speed bearing, large bearing hundreds ofturning even high-speed bearing.

  High speed bearings generally refers to the bearing speed reached 60 meters per second. In the sliding bearing, hydrostatic bearings, hydrodynamic bearings, aerostatic bearings, hydrodynamic gas bearings are suitable for high speed rotation.

  But the general rolling bearing adapted to low speed rotation, if the use of rolling bearings of high speed rotating need special requirements. The above bearings are in Chinese standard, it is easy to search to the bearing, reasonably choose the model according to the use of the load and other factors.

  If the speed between 5 to 60 meters per second, if not on the high-speed bearing, as long as the general bearing lubrication basic can satisfy. If the bearing use higher speed in some special occasions, such as high speed rotary bearing used in high speed cutting machine or precision machining machine tool can also be used for bearings, magnetic bearings, ceramic bearingselectric power special, but contact with the professional manufacturers.

Some knowledge elements imported deep groove ball bearing life

First, deep groove ball bearings are correctly installed, directly related to the accuracy of bearing life and performance. Therefore, installation and design department for bearing installation to fully research, analysis of the bearing structure, etc. in order to ensure normal operation of the double row ball slewing bearing:
Cleaning bearings and related components; this is very important, attention must be cleaned to prevent debris in them. Check the size and finishing the connected components; this requires some specialized tools to ensure the accuracy of the bearing installation. After installation check the bearings; check whether the bearing support, if there is the wrong place. Supply lubricants, require careful operation, it is important.
Second, deep groove ball bearings basic monitoring conditions:
Need some professionals, the bearings have regular checks, which can identify potential problems early will prevent unexpected machine stop, so that production can be safely carried out to improve plant productivity and efficiency. During use of the bearing, the basic external conditions should always be monitored bearing run, such as temperature, vibration and noise measurements, etc., so as to take preventive measures.
Third, the alignment deep groove ball ball and roller combined bearing, alignment:
These actions could accelerate fatigue and reduce bearing life, will damage the life of other machine parts. Furthermore, increased vibration and friction can significantly increase energy consumption and the risk of premature failure. However, after installing the bearing, if not carefully for alignment, alignment may lead to additional load bearing suffering, friction and vibration. Leading to premature failure of the bearing in advance, so it should be adjusted, alignment!
Fourth,deep groove ball bearing re-lubrication:
If deep groove ball bearings consider lubrication oil lubrication dominant. However, they can simplify the specialty grease around the bearing structure. In the course of the operation, deep groove ball bearings requires the correct re-lubrication, lubrication of the bearing assembly benign operation, in order to play well bearing function, first, to select the appropriate conditions of use, purpose of use lubrication method is the use of lubricating oil or grease lubricated bearings depends on the specific circumstances and given up!
Fifth,deep groove ball bearings to remove:
Use the proper tools to remove, which will help prevent damage to other machine components, incorrect technique may have to remove the bearing damage, if bearing reaches its end-use period of time, it should be replaced out. Although bearings can no longer be used, but the right to remove the original bearings, timely replacement of the new bearings, new stacker-reclaimer bearing for extended life can play a good role in promoting, so replacement of old and new, is very important, you need to check the operation of professional staff .

How to measure the operating temperature of thrust ball bearings

Thrust ball bearing temperature, generally by the bearing chamber outside temperature can be inferred that if the use of the hole can be measured directly thrust ball bearing outer ring temperature, the more appropriate.
Typically, thrust ball bearings with the four point contact ball slewing bearing operating temperature slowly began to rise 1-2 hours to reach steady state. Normal temperatures thrust ball bearings due to the heat capacity, heat capacity, speed and load of the machine and different. If lubrication, improper installation, the bearing temperature will be rapid-rise, there will be abnormal high temperature, when to stop running and take the necessary precautions.
You can always use the thermal sensor to monitor the thrust ball bearing operating temperature, and automatic alarm or stop to prevent burning shaft accident temperature exceeds a predetermined value.
Often expressed with a high temperature thrust ball bearings in unusual circumstances. Temperature is harmful to thrust ball mobile crane bearing lubricant. Sometimes bearing overheating can be attributed to the bearing lubricant. If the bearing temperature over 125 ℃ even move to reduce long bearing life. Causes high temperature bearings include: lack of lubrication or excessive lubrication, lubricant. Contains impurities, the load is too large, the bearing ring damage, lack of space, and high-friction seals and so on.
Thus, continuous monitoring of bearing temperature is necessary, whether measured bearing itself or other important parts. If you are under the same operating conditions, any change in temperature may indicate a fault has occurred.
Thrust ball bearing temperature measurement by means of regular thermometer, such as digital thermometers, bearing temperature can be accurately measured and determined in accordance with ℃ or Fahrenheit units.
The importance of thrust ball bearings, which means when it is damaged, can cause equipment downtime, so the best type of bearing temperature detectors should be installed.
Under normal circumstances, thrust ball wind power bearing lubricated or relubricated immediately after the temperature increase, and there will be natural for one or two days.

How many of miniature ball bearings paired parts for testing

Since the accuracy of precision miniature ball miniature ball bearings itself within 1μm, thus requiring its matching parts (shafts, housings, end caps, ring, etc.) have a high dimensional accuracy and shape accuracy, especially to control the accuracy of the mating surfaces of the bearing within the same level, which is crucial, but also the most easily overlooked.
You must also pay attention to precision miniature ball bearings to match parts if not meet the above requirements, often makes precision bearings error occurs several times larger than the original bearings after installation, even 10 times higher than the error, completely ceases precision bearings, because Matching mechanical error is often not simply superimposed on the high precision bearings error, but in a different multiples after amplification additions.
Miniature ball bearing dimensions determined in accordance with the requirements are not the same. Parameters are not the same, bearing in determining the size parameters, we start from multiple angles. Here we talk to everyone from all angles:
In many cases, miniature ball bearings bore size has been specifically defined by the structure of a machine or device. Whether working life, static load safety factor and whether the economy will meet the requirements, bearing the rest before the final selection of the size and structure, will be subject to the size of calculus. The calculation includes the actual load with its load miniature linear bearings

 capacity for comparison.
Miniature ball bearing static load refers to the rear bearing load is stationary (no relative movement between the inner and outer rings) or rotational speed is very low. In this case, the calculation and the rolling body raceways and an excess of factor of safety of plastic deformation. Most affected by dynamic load bearing inner and outer rings relative motion, check the size of calculus fatigue damage raceways and rolling elements of early safety factor.
In fact, miniature ball bearings and model parameters are also functional relationship with the intended use. We must pay attention to these issues.

Thrust ball bearing noise judgment for maintenance checks

   In order to determine whether the removed bearing can be reused to wash clean after the thrust ball bearing checking. Carefully check the raceway, rolling surface, with the surface state of cage wear, increasing the bearing clearance and the presence or absence of injury on the dimensional accuracy of the decline, abnormal. Non-isolated type of small ball bearings, the inner ring with one hand support level, rotate the outer ring to confirm whether smooth.
   Tapered roller bearings and other separation-shaped high precision ball bearings, rolling elements can be, respectively, the outer ring raceway surface inspection.Large bearings because they can not rotate by hand, pay attention to check the rolling body raceway, cage, and other exterior wall surface, the importance of bearing the higher the more necessary to be careful inspection.
   Can be used to determine whether, considering the extent of damage thrust ball bearings, mechanical properties, the importance of operating conditions to be determined during the next overhaul. However, if the following defects can no longer use. Must manage new ones bearing.
   Bearing Manufacturing noise caused by factors although essentially due to a
manufacturing error, but in fact still with lubricant selection, installation conditions of the miniature ball bearings, shaft and housing accuracy states. This noise is divided into the cage and the sound of chatter sound categories, as described below:
   (1) cage sound and control with periodic vibration and noise, prone cage refers to violent vibration sound cage and rolling elements emitted shock and friction in the pocket loose big time. This noise occurs mainly in ball bearings and thrust ball bearings and stamping cage and solid cage will occur when using grease or oil lubrication occurs, but in poor lubrication or lubricant dried up, the radial clearance When the large, outer withstand torque loads, and poor cage structure and accuracy is not high, the more prone to severe cage webs or rivet head will suddenly break.
   The method of controlling noise and vibration cage there; use good lubrication performance lubricants; reduce installation errors bearings; compression bearing radial clearance or suitably axial preload, as well as the choice of having a reasonably good accuracy cage structure flanged ball bearing

, or switch to cage firmly and without worn bearings.
   (2) The sound and control chatter chatter sound is directly related to bearing rolling surface waviness related noise, which is a pure tone noise, for a constant speed, its frequency does not change, and for changing speed It also will change the frequency.  

 

Installation and adjustment of the high-speed bearings

   When fit and clearance high speed bearing both due to the high-speed precision bearings according to the requirements, but also by high-temperature bearing requirements, so considering its fit and clearance, to take into account the following points:
  (1) a dimensional change and hardness change from normal temperature was raised at a high temperature;
  (2) due to the centrifugal force at high speed, and change in shape.
In short, high-speed, high-temperature conditions, and clearance from the mating choice should strive to maintain the accuracy and performance of the bearing, which is difficult.
 In order to ensure the bearing raceway deformation after installation, angular contact ball bearings over the amount of interference can not get too much interference fit, while the heat under the centrifugal force and high temperature under high-speed expansion, or offset the mating surfaces of the normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully consider the above two factors in the premise, at room temperature constant speed under effective amount of interference for high-speed bearings may be invalid.
   If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the miniature ball bearings dmn value 3 million mark. Thermal expansion at high temperatures, or the mating surfaces to offset the normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully consider the above two factors in the premise, at room temperature constant speed under effective amount of interference for high-speed bearings may be invalid.
   If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark. When considering the high speed bearing clearance only to consider the above factors, but also to consider the impact of thermal elongation axis clearance required bearing in working condition, that have the best clearance at operating temperature, and this species clearance is included,the exact center of the outer ring ball groove to the next state formation. Since the high-speed bearings reduce strive relative sliding and internal friction, angular contact ball bearings best not to use the inner and outer rings relative axial displacement method to adjust ball bearing clearance.
   In considering the amount of interference with the flanged ball bearing and the clearance, to be noted that the material becomes soft and easily deformable features, and many times from room temperature to high temperature changes caused by the possibility of a certain permanent

deformation at high temperatures.

The working environment and the performance of the miniature ball bearings

The miniature ball bearings is composed of an inner, outer ring, rolling body (ball, roller or needle roller and cage) is composed of four parts, in addition to maintain the reactor, the rest are composed of bearing steel. When the bearings, bearing inner, outer ring, rolling bearing body bear the high frequency, stress function. Bearing working conditions are very complicated. Load concentration in a small area of the rolling body. Theory for the ball, in a point; and the roller is in a line, and the rolling body and the ring contact area is very small (a point / line contact), so the bearing parts in the work, the rolling body and the ring surface per unit area to bear great pressure in general, up to 1500 - 5000N/mm2; Series radial ball bearings rotation, but also bear the role of centrifugal force, the force increases as the speed increases; a rolling body and a ferrule exists not only rolling, and sliding, so there is friction between the roller and ring. The comprehensive role in the above several stress, fatigue strength of low position on the surface of ring or rolling of the first fatigue crack, finally forms the fatigue spalling, the bearing failure. Bearing normal damage form is the contact fatigue damage, common and plastic deformation, indentation, wear, cracks etc.

Double row ball slewing bearingand shaft installation inspection method

In general, tight interference fit the installation of double row ball slewing bearing must be close to the shaft shoulder. Test method: (1) the light method. The lamp alignment Koyo bearings and shaft shoulder, see the leakage judgment. If no leakage, installation is correct; if the light evenly along the shaft shoulder around, the bearing and shaft shoulder is not close, with the pressure bearing close; if partial leakage, the bearing installation tilt, can be hand hammer, brass or percussion bearing inner ring sleeve, is slowly. (2) to test the feeler gauge. Feeler gauge thickness shall be 0. 03mm began. Test, test in several in the bearing inner ring end face and shoulder the entire circumference, if there is a gap and very uniform, indicating that miniature ball bearings is not installed in place to deal with bearing, double row self-aligning ball bearing inner ring of pressure it tightly against the shoulder; if the increased pressure is not tight, the Journal fillet positions fillet is too large, the bearing is stuck, should be trimmed journal fillet, make its become smaller; if it is found that the end surface of the inner ring and the bearing shoulder thickness gauge individual parts can pass, not at this time must be removed, to be repaired, re install.

The principle of  lubricating bearings and three row roller slewing bearing are basically the same, only the bearing working condition is bad, its performance can achieve effective lubrication depends to a large extent on the bearing.‍