ABOUT US

Renowned Bearing Manufacturer And National Leader

Shandong Nairun Bearing Co., Ltd.is an export manufacturer mainly engaged in the sales of bearings. It integrates science, industry and trade. Our company has experience in bearing supporting and industrial services in the industrial field, and has a good reputation among customers. The company specializes in the production of various types of bearings, deep groove ball bearings, hub bearings, needle roller bearings and other bearings. Among them, the production and research and development of stamped outer ring needle roller bearings and deep groove ball bearings have reached the advanced level in foreign countries. In addition, we can also carry out research and development and production of non-standard bearings according to the requirements of different customers.
The company's products are widely used in automobiles, gearboxes, railways, railways, electric power, metallurgy and other industries. The industry's services are honest and efficient, and the products are of high quality and low price. After years of technology and experience accumulation, combined with the company's sophisticated equipment, perfect testing methods and quality assurance system, we have won unanimous praise from customers, and we can provide customers with high-quality products. The products are exported to Europe, America, Southeast Asia and the Middle East, and are well received by customers at home and abroad. "Good quality, good reputation" is the management policy of our factory, and we are willing to create a win-win situation with new and old customers. Narun Bearing welcomes customers to call us for inquiries and negotiations.

Production experience

0

+

Exporting country

0

+

Quality service

0

%

Company Culture

Renowned Bearing Manufacturer And National Leader

Corporate purposes

People-oriented, honest and pragmatic, innovative and enterprising, and repay the society.

Business purpose

The pursuit of excellence is endless, keep pace with the times and create the future!

Service purposes

Warmly receive new and old customers, and accurately understand customer needs; strictly control the quality process to ensure the delivery cycle of the contract; conduct quality tracking in time, and quickly handle quality objections.

Quality purpose

With factory control standards superior to domestic and international standards, we meet customers' expectations and requirements for product quality.

Entrepreneurial spirit

Famous in China and famous in the world

Enterprise's goal

Create a famous brand in China and create world-class products

The benefits of cooperating with professional bearing companies

In the business of repairing bearings, if users can obtain the cooperation of professional bearing companies, they may get the following benefits:
(1) It is possible to clarify the technical requirements of each repair process and how to ensure the overall quality of the repaired bearing;
(2) Many specialized experiences of professional bearing factories can be used, which can meet the process requirements reliably, efficiently and economically;
(3) You can order tooling molds from professional bearing companies and borrow them for repair business, which may be more economical and save a lot of trouble;
(4) Accessories such as cages, rolling elements, rivets, etc. can be ordered from professional bearing companies, which may make the repair work simple, convenient and economical.

Reasonably choose the application method of high-precision imported bearings

It must be recognized that clearance is an important factor for the normal operation of imported bearings. Choosing an appropriate bearing clearance has many benefits for the bearing: it can make the load be distributed reasonably between the rolling elements; it can limit the axial and radial displacement of the shaft (or shell) to ensure the rotation accuracy of the shaft; It can work normally; it can reduce the vibration and noise when the bearing is working. It can be seen that the bearing clearance has a great influence on the bearing life, temperature rise, vibration and noise. When selecting the bearing clearance, in addition to the working conditions of the bearing (such as load, speed, temperature, etc.) and the requirements for the performance of the bearing (such as friction torque, vibration and noise, rotation accuracy, etc.), you should also consider:

1. The interference fit of the bearing to the shaft and housing results in reduced clearance;
2. When the bearing is working, the temperature difference between the inner and outer rings causes the clearance to decrease;
3. The materials of manufacture of the shaft and housing have different coefficients of expansion resulting in reduced or increased clearance.

 

The use experience shows that the suitable working clearance for ball bearings is approximately zero; for the suitable working conditions of roller bearings, a small amount of working clearance should be maintained. In parts that require good support rigidity (such as machine tool spindles), there can also be a certain value of preload.
High-precision bearings refer to imported bearings with high rotational accuracy, high dimension accuracy and small surface roughness. In my country's standards, P4-level bearings and higher than P4-level bearings, such as P2-level bearings are high-precision bearings, which are roughly in line with American standards. ABEC7 is equivalent to ABEC9, and is equivalent to international standards ISOP4 and P2. International standards are recognized and adopted by many countries, such as Japan, Germany and France.
Through precision machining, various types of rolling bearings can meet high-precision requirements, but angular contact ball bearings are mostly used in high-precision imported bearings, and in metal cutting machine tools with high precision and high rigidity requirements For the main shaft, there are many double-row short cylindrical roller bearings, followed by tapered roller bearings.
At present, due to the development of bearing processing technology, the international level of the actual finished product error of precision bearings at all levels is mostly below 1/2 of the standard value. For example, the roundness of imported ball bearings for machine tools is 0.3 μm, while that used in computers is 0.25 μm.
Generally speaking, when users select precision bearings, they should first choose from the above three types. Moreover, even among these three types, precision products are not produced for every specification, and it is necessary to search the catalogs of various bearing companies or manufacturers, or ask their bearing sales departments