Miniature Bearing Failure

About the failure of miniature ball bearings in the 40% by dust, dirt, debris and pollution caused by corrosion. Pollution is usually caused by improper use and poor use of the environment, it can also cause problems torque and noise. Miniature Bearing failures and pollution generated by the ring is preventable, and by simple visual observation can determine the cause of this type of failure. As long as a reasonable use and install, miniature bearings are easy to avoid the erosion. Erosion is characterized in miniature bearing ring raceway indentations left by the impact load or incorrect installation generated. Erosion usually occurs when the load exceeds the material yield limit. If not properly installed so that a load across the miniature bearing ring will produce erosion. Indentation will be miniature bearing ring on noise, vibration and additional torque.

The limit of the thin wall bearings contact Angle

The limit of the thin wall bearings contact Angle is 120 °. When the sliding bearing wear and tear to the contact Angle, fluid lubrication will be destroyed. So don't affect the sliding bearing compressive conditions under the premise of the smaller the contact Angle is better. From the theoretical analysis of the friction torque, when the contact Angle is 60 °, minimum friction torque, so, the speed is higher than 500 r/min of miniature linear bearings, contact Angle 60 °, speed is less than 500 r/min of sliding bearing, contact Angle can be used in a 90 °, 60 ° is used.

Shaft neck and the actual situation of the sliding bearing surface contact, available per unit area of the actual contact points. The more contact, more and more even, said sliding bearing scraping the research better, on the other hand, sliding bearing scraping the inquiry is not good. In general the more the more close contact point, research difficulty is large. Production should be based on the performance of the sliding bearing and working conditions to determine the contact point

Miniature bearing representative products for household appliances

Household miniature bearing ( miniature linear bearings ) on behalf of the product is cleaner and the air conditioner motor bearing, mainly motor 22mm diameter. Characteristics of vacuum cleaner motor speed is up to 4-5 million to /min,conical bearing , motor and 100，000 rpm /min have also been used as cleaner mass market sales.

  The air conditioner is long in the indoor use of equipment, have a high demand for low noise. Present problem is, electric corrosion electricity causes between the inner and outer slewing ring bearings , the solution is to use non conducting ceramic ball, from a technical level and will enhance the appliances used in miniature bearings.

The main application fields of miniature linear bearings

As the car miniaturization of electric process, the corresponding parts products on the increase. Therefore,rolling mill bearing , the related car parts market in the future will continue to expand.

  The development of automotive bearings,bearing manufacturer will focus on security, improve the efficiency and reduce the harmful substance. Automobile radiator cooling fan motor, wiper motor, exhaust gas recirculation system (EGR) the valve frame and anti lock braking system (ABS) as the representative of the pump motor and its application system is the main application field of miniature linear bearings .

The derivative product of miniature bearings

The development of the ABS system is a typical example of automotive related products development.Miniature linear bearings in the future will be with the requirement of safety and environmental protection is increasing day by day, can derive many new applications.

Imported bearing market aiming to try will create new steam hybrid and electric vehicle car related products. In this development,four point contact ball slewing bearing , the miniature bearing relates to the field will continue to expand, the precision will improve, with the China car,the development of the industry, domestic enterprises huge development space.

Miniature bearings and automotive bearings

Miniature bearings( miniature linear bearings ) mainly used for matching with the host industry, including automotive, home appliances, medical equipment and other industries, the development of related industries will drive the industry demand.

  China's auto market in recent years has maintained rapid growth trend, retain income per capita amount, residents from the car, car ownership per capita factors consider, the car is still in the incremental market, not into the stock market.

  According to 2015-2020 years Chinese  bearing manufacturer for published prospective industry research institute ,Production and marketing industry transformation and upgrading of demand forecasting and analysis report shows, the automobile industry high growth remained for a period of time, the future growth of not less than 15%.

Training skilled bearing managers

Product quality, a process to ensure a scientific, but also have high-quality management personnel to implement. Antirust management is "prevention" and take preventive measures, will produce metal corrosion factor nipped in the bud, and which requires skilled, with high-quality management personnel.

First, truck mounted crane bearing managers are required to have anti-rust metal corrosion basic theoretical knowledge, have a certain level of expertise, the importance of anti-rust management have a full understanding, there is a high degree of responsibility, anti-rust process specification can conscientiously implement and carry out supervision carried out.

For example, requiring antirust level managers must have a college degree, a metal corrosion expertise, familiar with the bearing processing the entire process, all bearing rust can develop technical rules, with a production deal with and solve problems arise the actual ability, training and work instructions antirust members.

Owned manufacturing plant for rust prevention officer asked two must have a high school education, after induction by the technical department for their technical training, basic theoretical knowledge from rust-proof, rust-proof technology content and operation points and rust-proof materials during use detection and monitoring methods to the importance of anti-rust work, so that they improve their professional skills by learning antirust comprehensive system to enhance awareness of disease prevention, according to the company's leading technology can apply the knowledge learned documents, combined with the specific units case for the unit to work out specific antirust rules; each member of every able-rust-site inspections, monitoring the implementation of anti-rust process, the general anti-rust problems can be analyzed and timely processing solutions, that can not be resolved problems promptly report to their superiors technology sector, cooperative solutions; and is able to project accurately monitored regularly testing according to process requirements. So a team of professional technical and management training is very necessary.

Formulate scientific management methods

Management is a concrete manifestation of anti-rust management, saying no rules, no standards, good scientific management is an important means to ensure product quality. Antirust management including process management, cooling water management, anti-rust solution management, cleaning vertical mill bearing fluid management, anti-rust oil management and rust auxiliary materials management. Los axis using two anti-rust management system, at the level of anti-rust technology management department, responsible for the development and centralized management of anti-rust process, responsible for anti-rust auxiliary materials testing and inspection, is responsible for technical guidance rustproof member responsible antirust work for secondary management assessment, and rust-proof new technology, research and development and application of new technologies.

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.

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.