The characteristics and development history of foreign bearing industry

The development of the world's bearings has gone through three stages, in which it has experienced many difficulties and obstacles, and finally achieved the glory of the bearing industry.
The world's bearing industry began in the late 19th century to the early 20th century. In 1880, the United Kingdom began to produce bearings. In 1883, Germany established the world's first bearing company (FAG George Shaver). In 1889, the United States opened the ND bearing factory (now the General Motors Bearing Company's new Diocletian Hyde Bearing Division). Other large bearing companies in Europe and the United States basically laid the foundation for today in the early 20th century. After the Japanese bearing industry was formed in Europe and the United States, SKF Sweden provided samples to Japan in 1910, making the "bearing" appear in Japan for the first time alone. Since then, Japan NSK, NTN and other bearing companies have been established in 1914 and 1918. The bearing industry in the third world countries started later, and it is in a relatively backward situation like the entire science and technology and machinery industry.
Generally speaking, the formation and development of the world bearing industry has gone through three stages:
The first phase, the initial stage of the world bearing industry, was from the end of the 19th century to the beginning of the 20th century. At that time, bearing inventions and applications have been around for a while, and the industrial production of bearings has grown from scratch, just starting, quite naive. The main features are:
1. The production scale is extremely small. A large factory has only a dozen to a few hundred people. The daily output is only a few sets to several hundred sets, which belongs to hand workshop production;
2, the equipment is simple, the technology is backward, mostly based on experience;
3, the material is mainly carbon steel, the precision is not high, the price is expensive;
4, very few varieties, the use is very limited. At that time, bearing production technology was only in the hands of a few companies such as the United Kingdom, Germany, Sweden, and the United States.

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How to look at the quality of a bearing

1 First look at the materials used in bearing steel, Germany FAG bearings are produced by their own professional steel mills, in terms of hardness and precision are higher than counterfeit FAG bearings.
2 Using high-input marking equipment, in order to establish a corporate brand image and prevent products from being counterfeited, FAG bearing manufacturers have adopted laser marking machines, hoping to establish a corporate image and connect with the international market, while using high input to control products being counterfeited, however, Because the laser marking machine uses computer control, the advantages of easy editing of marking fonts and sizes can not only effectively prevent counterfeiting, but also increase the difficulty for counterfeiters.
3 observation method. The rolling bearing should be observed with the naked eye. The inner and outer raceways should have no peeling marks and severe wear and be in the shape of a circular groove; all the rolling elements should be free of spots, cracks and peeling; the cage should not be loose, damaged or worn. , the gap with the rolling element is not too big.
4 feels. The gap between the inner and outer races of the normal bearing and the rolling elements is 0.005 to 0.010 mm. For rolling bearings that have been used for one stage, when the inner race is pinched with your fingers for axial sway, there should be no obvious squeaking noise.
5 rotation method. Hold the inner race of the bearing with one hand and turn the outer race with the other hand. The bearing should be able to rotate flexibly and the radial sway should not be felt.
6 Of course, it depends on the price. If the price is much lower than normal, it may be a fake proposal. Don't buy it. After all, a penny is worth the price. It is really expensive after all, so the import is very expensive.
During the inspection, the above five empirical methods should be combined to facilitate the correct judgment of the technical state of the rolling bearing. For tapered roller bearings, it should also be observed whether the rolling elements are located in the middle of the outer race. If there is a forward movement, it should not exceed 1.5 mm.
In addition to the above-described discrimination method, it can be distinguished from color and precision. At the same time, you can also refer to other imported bearing brands, iko bearings, Sweden SKF bearings, the United States TIMKEN bearings, Japan NSK bearings, koyo bearings and other methods of distinguishing authenticity.

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