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.

The difference between domestic and foreign rolling bearings

Our precision spindle bearings industry started construction in 1950, after half a century of development, has formed a relatively complete system of production and technology system, to become the world's fourth largest country rankings bearing manufacturer in Japan, the United States and Germany, and has achieved remarkable achievement. However, compared with the bearing industry developed countries, China's bearing industry, there are still a big gap. Main features:

One on varieties, different specifications of products triple row roller slewing bearing the world total of about 150,000, our total production to date only two thousand months, and mostly for generic products.

Second, the production capacity, China's current production is about bearing more than 2,000 enterprises, is 5 to 6 times in other countries around the world bearing companies combined. However, the annual output value of the country's only comparable to the United States ranked sixth TIMKEN (about 21 billion yuan); compared with the number one Swedish company, equivalent to only half of its annual output (about 40 billion yuan) of ; Compared with Japan, equivalent to only ten percent of its annual output.

Third, the dimensional tolerances and precision rotation, even though our country is close to self aligning ball bearing foreign brand-name level, but in terms of the size of the deviation of the dispersion, there are still a wide gap. In addition, the countries have already begun to study and application of "non-repeatable runout" This fine precision rotation indicators, and our research in this area is still blank.

Fourth, in the high-speed performance, the value of foreign brands of DmN 4 × 106mm · r / min, while China bearing only 2 × 106mm · r / min.

Fifth, the vibration, noise and different sound, Japan has launched a mute and ultra-quiet bearing, and our bearing vibration (acceleration) compared to the extreme levels of Japanese products, generally more than a difference of 10dB.

Sixth, in life and reliability, deep groove ball bearings, for example, foreign brands of life is generally calculated life of more than 8 times (up to 30 times), the reliability of more than 98% (or to pursue with the host and other life), and our general life of the bearing life calculation is only 3 to 5 times the reliability of about 96%.

Seven, in the special conditions of the bearing application technology, China's bearing is there is a considerable gap.

It is precisely because there are not enough of bearings from different specifications to performance quality and other aspects, therefore, not only in the export, the vast majority of low-end products, each bearing an average price of only about $ 0.4, does not have any technical competence, and In a number of important host country or areas, such as civil aviation aircraft, high-speed railway passenger cars, luxury cars, computers, air conditioners, and other major equipment imported type, essentially consists of imported bearings "domination." These industries or areas, and there is a pillar industry of the national economy or in the field.

Application of ceramic ball bearings in high speed spindle unit

   Ultra-high-speed cutting is high quality, efficient and characterized by advanced manufacturing technology, which can bring high-speed cutting mechanism, high-speed spindle unit, high acceleration and deceleration linear feed motor development, high-performance control systems and other related cell technology. Core support high-speed spindle unit is high-speed spindle bearings. Ceramic bearings for its resistance to high speed, light weight, long life, excellent performance, high-speed spindle unit in machine tools are widely used.
   A high-speed spindle unit and the spindle slewing bearing manufacturer High-speed spindle unit is one of the key technology to achieve high-speed processing, but also a key component of high-speed machine tools. The core of the high-speed spindle unit is high-speed precision bearings, its performance directly affects the performance of work spindle unit. With increasing speed, the bearing temperature, vibration and noise increase, decrease in the life. Therefore, increasing the spindle speed on the premise that developed a superior performance, high-speed spindle bearings. Currently, high-speed spindle unit, supporting mainly uses magnetic double direction thrust ball bearing spindle, liquid hybrid bearing, ceramic ball bearings in three forms. Magnetic Bearings and good high-speed performance, high precision, easy to implement diagnostics and online monitoring. But practice shows that the bearing due to electromagnetic measurement and control system is too complex and has not been widely used. Liquid hybrid bearing combines the advantages of hydrostatic bearings and hydrodynamic bearings, but this bearing must be specifically designed according to the specific machine, a separate production,the low degree of standardization, maintenance is also difficult.
   Currently, the most widely used high-speed spindle bearings or hybrid ceramic ball bearings, namely the use of the rolling elements or hot isostatic pressing Si3N4 ceramic ball bearing rings remains rims. Such a high degree of standardization of the bearings, low price, small changes to the machine for easy maintenance, especially for high-speed operation of occasions. It d · n has exceeded the value 2.7 × 106. To increase bearing life, increase the wear resistance of the raceway, the raceway of the coating treatment or other surface treatment.
   2 Experimental Research
   Test conditions
   The ceramic ball bearings used in the test parameters as shown in Table 1. The ceramic ball material HIPSN (hot isostatic pressing Si3N4), the accuracy level is G3 level, balls and rings when assembling the required value of the fine matching. The bearings are "dense beads beads" structure, and use the thin outer cage. In the tests with the ceramic bearing ball flange bearing

 steel having the same structural parameters.
   Spindle tests used are two models, namely A-type and B-type. Structure schematically shown in Figure 1, the bearing installation in the form of DBB. Table 2 is the main performance parameters of the two spindle.
Table 1 Test parameters with ceramic ball bearing Model Dimensions (mm) ball diameter (mm) contact angle of the original number of balls ceramic ball material cage material ferrule material
   B7007CY35 × 62 × 147.1441615HIPSN resin GCr15
   The main performance parameters in Table 2 spindle
Model limit speed (r / min) spindle diameter (mm) output power (kW) Lubrication
A mist type 30000354.5
B-type 24000354.5 fat
    A high-speed spindle unit structure diagram in Fig.