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.