taper roller bearing industry has been one of the national key enterprises

company developed " Metro ( light rail ) development and application of bearings " project , if successfully implemented, can promote China's subway cars bearing domestic work , breaking the monopoly of foreign technology , reduce procurement costs and improve the ability to self- repair , revitalize national industry, to promote the development of China's rail transportation equipment manufacturing and upgrades.
Insiders said that before the 1990s, Northwest bearing bearing industry has been one of the national key enterprises , the scale of production in the fourth digit industry . The company plans a total Bearing manufacturer investment of 400 million yuan construction of high-end bearings project construction period of 2 years , the first four years of full production . After completion, the expected sales income 63,000 yuan, net profit of 6,150 million. With the successful implementation of roller bearings the project , Northwest bearing plain bearing products will be phased out , the major resources into high value-added " large , high-speed , precision ," R & D and production of high-end bearings , very in line with national industrial policy , comply with the current economic , policy orientation. This will not only be able to expand its market share in the Northwest bearing production scale and product , help the company to return to the first tier bearing enterprises , but also to promote the overall development and progress of China's bearing industry to some extent

To shorten the gap between the world ball bearing

To shorten the gap between the world powers bearings , bearing manufacturing to improve our manufacturing level , the Chinese government has issued a series of industrial policies to support and encourage domestic enterprises towards the end bearing bearing localization direction. "Long-term Science and Technology Development Plan (2006 - 2020 ) " should be made to focus on the development of major equipment required for the Bearing test machine design of key basic parts and components , manufacturing and key technologies for mass production . China's " bearing industry," second five "development plan" put forward , "Twelve Five" period, the bearing industry 's main business grew 11.84 percent average annual production average annual clutch bearing growth of 13.30% , industry profits grew 13.90 percent average annual total goals. This reflects the country fully affirmed the important status and role of the bearing industry in the national economy , as well as support for the development of industrial bearings , bearings for the healthy development of the industry provides a good opportunity for development .

Rolling in the manufacture of the contract is required clearance

Tapered roller bearing type code 30000 , tapered roller bearings for the separation of bearings . Under normal circumstances, especially in the inner cone GB/T307.1- " Rolling bearings tolerance " involved in the size range of roller bearings are one hundred percent can be used interchangeably in common between the outer and inner components . The angle of the outer ring raceway and the outer diameter has been standardized Bearing manufacturing machine with the same dimensions provides . When allowed to change in design and manufacturing . Between the tapered roller bearings to cause the outer and inner components can be interchanged in common worldwide .
Tapered roller bearings are mainly used to bear radial load mainly radial and axial load . Compared with angular contact ball bearings , bearing capacity, low speed limits . Tapered roller bearings can withstand axial load in one direction a direction to limit the axial displacement of the shaft or housing .
Dynamic bearing from manufacturing to installation and then use its clearance what changes
Rolling in the manufacture of the contract is required clearance
this clearance is generally referred to as the original clearance ; while the bearing is installed on the host , because a ferrule has an interference fit , resulting in reduced high speed bearing clearance values this clearance is formed after the installation is called installation clearance ; after running, bearing parts temperature, volume changes, because the bearing shaft or housing to match the temperature increases also occurred in the age of elongation phenomenon, which lead to recurrence of the bearing clearance changes , this work is called up clearance clearance work . Generally, it is less than the installed operating clearance clearance, sometimes also with the clearance values ​​group with different installation methods increases.
The method of running track and applied load

for more oil wedge tilting ball bearing does not allow repair scratch pad

can be carved by hand scrape or bearing surface after turning padded repair scraping method adjustments.  2, cylindrical and oval on top of the bearing clearance , can be hand- scrape method or circumstances allow the bearing to the equatorial plane padded adjustments.  3, for more oil wedge fixed bearing, in principle, allow repair scratch and adjust bearing clearance , clearance inappropriate should be taper roller bearing replaced with new tile .  4, for more oil wedge tilting bearing, does not allow repair scratch pad , the gap should be replaced due to improper tile . Adjustable tile thickness can be adjusted by the amount of tile tile behind the next plus stainless steel pad adjustment block , block or adjust the thickness of the thinning method . Note for more oil wedge tilting high speed bearings  among the same group of tile thickness error should be less than 0.01mm.maintenance of technical requirements for the operation of the bearings to withstand load, speed , temperature , vibration, noise and lubrication condition monitoring and inspection , abnormal immediately find reasons to adjust to return to normal. Without further need for impact resistance as spherical roller thrust bearing materials using chrome steel , chrome molybdenum steel , nickel-chromium -molybdenum steel , the use of carbon infiltration quenching the steel from the surface to the proper depth of a hardened layer