What is the difference between imported bearings and domestic bearings?

With the advent of the tide of internationalization, the domestic bearing code is gradually in line with the imported bearing code, and the latest published national standards show that the domestic code is basically consistent with the international ISO standard. Regarding the advantages and disadvantages of the two, please see the comparison between domestic bearings and imported bearings:

1. The difference between models.

With the advent of the tide of internationalization, the domestic bearing code is gradually in line with the imported bearing code, and the latest published national standards show that the domestic code is basically consistent with the international ISO standard.

Bearing on the logo, such as the domestic bearing is generally Luoyang shaft ** is (luo) and Harbin bearing ** is (ha) is basically so, each bearing out of the number ** indicates that the bearing model outside the pinyin logo represents the origin, if you are a person from the machinery industry should know.

2. Other aspects.

Compared with domestic bearings, imported bearings are generally better than domestic materials, the heat treatment process is more advanced than that of China, the manufacturing precision is high, the manufacturing and assembly process is more reasonable, and the service life is long, of course, it is also higher. And there are generally many imported bearings, and the most important thing is that. Imported bearings are all made in foreign countries.

Haha, this is something that everyone can understand.

As far as the service life is concerned, although the service life of imported bearings is longer than that of domestic bearings, it is completely okay if the ordinary machine does not require a high degree of precision. Now the quality of bearings produced by large domestic manufacturers such as HRB and ZWZ is very good. **It is also suitable and can be used.

But when it comes to accuracy, it's still a good point to import.

There are signs on the bearing, such as the domestic bearing is generally known as the Luoyang shaft ** is (luo) and Harbin bearing ** is (ha) is basically like this, each bearing out of the number ** indicates that the bearing model has a pinyin mark on behalf of the origin, if you are a person from the machinery industry should know

There are marks on the bearings, imported and domestic bearings are not the same, in my experience, generally good bearings are marked on the bearing with Wuxi Shengxiong laser marking machine, the mark is clear, not distorted, and the line outline is smooth. For example, the domestic bearing is generally Luoyang shaft ** is (luo) and Harbin bearing ** is (ha) is basically like this, each bearing out of the number ** indicates that there are pinyin signs outside the bearing model on behalf of the origin, if you are a person from the machinery industry should know

The appearance of domestic bearings and imported bearings is different. The bearing marking font and line width are also different, and most manufacturers use Wuxi Shengxiong laser marking machine.

The biggest difference is that imported bearings work longer than domestic bearings.

The essential difference is that the purity of the steel material is different, the processing technology is different, and the accuracy level of the bearing is also different.

Although now the quality of domestic bearings is improving. However, there is still a big gap with imported bearings.

1. The accuracy of the bearing.

Although the dimensional deviation and rotation accuracy of domestic bearings are very close to those of imported bearings. However, there is still a certain gap in dispersion with German imported bearings. Foreign countries have already begun to study and apply fine rotation accuracy indicators such as "non-repeatable runout", while China's research in this area is still blank.

2. In terms of vibration, noise and abnormal sound.

Japan has launched silent and ultra-quiet bearings, and the vibration extreme level of Chinese bearings is generally more than 10db different from Japanese bearings.

3. In terms of life and reliability.

Taking deep groove ball bearings as an example, the life of foreign famous brand products is generally more than 8 times the calculated life (up to 30 times more), and the reliability is more than 98% (or the pursuit of the same life as the main engine), while the life of Chinese bearings is generally only 3 to 5 times the calculated life, and the reliability is about 96%.

4. In terms of high-speed performance.

The DMN value of foreign brand-name products is 4 times 106 mm r min, while the Chinese bearing is only 2 times 106 mm r min.

There is no difference in the military industry now, and there are still differences in the service life of the civilian market, mute, etc. In the past, the bearings used in the country's aerospace industry were imported, and now the technology has made a breakthrough, and even the bearings used in high-speed rail are also domestic.

Roughly, imported bearings are better than domestic bearings, especially SKF, is recognized as the world's first, domestic bearings due to technology, equipment, raw materials, R & D investment, etc., the service life of bearings will be shorter, but in recent years, ZW, shaft research and other increased investment in technology research and development, there have been a number of bearing models to catch up with the level of imported bearings, you can compare the general situation of imported bearings and domestic bearings.

Domestic bearings need to be processed by superfinishing machines, and at present, China's domestic scientific research projects are also very large, and at present, Yuzhun superfinishing machines have provided proofing and mass production services for China's domestic automobiles.

The domestic bearing ** gradually conforms to the imported bearing model. According to the latest national standards, the domestic bearings are basically consistent with the international standards. Supporting marks, such as the domestic bearing is generally famous that is, Luoyang shaft code (luo) and Harbin bearing code (HA) are basically like this, each bearing has a number, indicating that in addition to the bearing model, there is also a pinyin on behalf of the origin, if you want people from the machinery industry should know.

In addition to other things, we do not care about the production process of the bearing, nor do we care about the appearance of the bearing, the key is the quality of use. The main introductions are as follows:1

Imported bearings have a long service life; 2.Compared with similar bearings of domestic brands, the maximum speed of imported bearings can reach the highest value; 3.The imported bearing has good load resistance; 4.

The imported bearing brings low noise to the working environment during use. Therefore, many domestic bearing manufacturers strive to improve their product quality and narrow the product quality gap with large foreign enterprises. The domestic and imported bearing models are basically the same, and the appearance quality is different, and the solid cage can also be used when the flange guidance is needed.

In order to ensure low inertial forces, the high-speed bearing cage is made of lightweight materials such as light metal or phenolic resin fabrics. The use of polyamide (nylon 66) cage has good sliding properties and self-lubrication.

Imported bearing brands include SKEFU, FAG, NSK, Timken, NTN, THK, red blood cells, IKO, INA and NACHI.

1. SKEFU is the world's leading bearing manufacturer. Born in 1907, SKF has a 100-year history of bearing manufacturing. Its business covers more than 130 countries and regions, and more than 500 million bearings account for nearly a quarter of the market share every year, which reflects SKF's influence and position.

2. Founded in 1883, FAG brand is a well-known manufacturer of bearing products in Germany and the world's leading supplier of comprehensive automotive and industrial products. The company uses its expertise and creativity to create many high-quality products in many fields such as machinery manufacturing, automobiles, aerospace, etc.

3. NSK brand was born in 1916 and is a well-known bearing manufacturer in Japan. It develops and develops a wide range of bearings, and has made great contributions to industrial development and mechanical progress. The company also uses precision machining technology to enter the fields of automobiles, precision machinery, and electronic application products.

and promote multi-faceted career development.

4. Timken is a world-leading manufacturer with a 100-year history, and its high-quality bearings, alloy steels, and related products and services are ubiquitous, whether on land, at sea, or in space.

5. NTN Bearing was established in Japan in 1918 and is a global comprehensive precision machinery manufacturer. Its products are widely used in various fields of industrial sectors such as orbital satellites, aviation, railways and automobiles, office equipment and food machinery. NTN is one of the world's most comprehensive precision machinery manufacturers.

6. THK was established in 1971 in Tokyo, Japan. High quality is synonymous with it. Since the 80s of the 20th century, THK has entered the American market and has become an industry leader with its superior series of products, which are sold all over the world.

7. Red Blood Cell is an international company with nearly 20 workshops in Europe. Its products are used in many fields, such as aerospace, military technology, robotics, semiconductor processing equipment, construction machinery, etc.

8. IKO is a bearing manufacturer with a history of more than 50 years. It is good at producing needle roller bearings and linear guides, and enjoys a high reputation all over the world. It is the longest, most complete and most professional needle roller bearing manufacturer in Japan.

9. INA was founded in 1946 and is headquartered in Nuremberg, Germany. INA has always been committed to product innovation to meet customer needs and provide high quality assurance, making it the world's leading rolling bearing manufacturer** and recognized partner for automotive manufacturers.

10. NACHI was founded in 1928. The company has always been known for its growing machine skills. Today, it has evolved into an analytical mechatromechanical manufacturer that supplies infrastructure and components to the general industrial sector.