显示标签为“angular contact ball bearing”的博文。显示所有博文
显示标签为“angular contact ball bearing”的博文。显示所有博文

2015年2月26日星期四

spindle bearing needi

spindle bearing needing preload is generally as angular contact ball bearings front bearing use.
angular contact ball bearing is generally used in groups, pre tightening in two ways,
1, bearing between the spacer sleeve, the top outer ring, inner ring with pressure pretightening nut.
2, at the end of main shaft side top outer ring, inner ring with a pre tightening nut pressure behind.
Methods 1 septum sleeve ends parallel precision must be very good. Mode 2, pressure ring side of the shaft is vertical to very good accuracy.
On the vertical accuracy requirements of bearing side with the thread of the locking nut is also high.
In addition, bearing must not install anti, anti loaded words bearing will be pressed powder.Note that the pre tension (or preload) must meet the requirements of bearing the instructions, otherwise it will damage the bearing.


2015年2月7日星期六

Advantages and characteristics of precision spindle bearings

The spindle bearing is the main shaft bearing of precision machine tools and similar equipment, to ensure the accuracy of its work and the use of performance of precision machine tool.

  Taking the NSK spindle bearing products in Japan as an example, precision spindle bearings include precision angular contact ball bearing 70 series, 719 series, 72 series, precision round
The column roller bearing N10 series, NN30 series, TAC series of bearings for precision ball screw support.


  • Spindle bearing characteristics
  • High performance design.

High rigidity, Ball Number 600, contact angle, high stiffness.
Long life, EP steel with long life, high reliability, service life is 3 times that of ordinary bearing steel SUJ2.


  • Contact sealed bearing series, high reliability, high dustSealed bearing dustproof performance is good, not easy leakage of lubricating grease. And the use of light contact seal ring, bearing torque low, low fever.

2014年12月16日星期二

Why China's high-precision bearings specifically import surge?


Related hot search term: Bearings Railway Bearings wheel bearings computer bearing mute bearing

In recent years, China's industry, especially the rapid development of the machinery industry. In 2002 the national industry average growth rate of 18.90 percent, 23.39 percent growth machinery industry. Eight categories of major machinery products to create the best pace of development since the founding, where vehicle production 3.477 million, an increase of 38.45% over 2001; the internal combustion engine 284 million kW, an increase 38.33%; metal cutting machine tools 232,000 units, up 19.15 percent. While precision spindle bearings industry is also developing rapidly, but still lagging behind the national industry and machinery industry. Especially focusing host supporting bearings relative lack of supply capacity, resulting in bearing imports soared.

Terms of production volume, China has a spindle bearing producing countries, but also far from bearing an industrial power. At present, varieties and specifications of products bearing a total of about 150,000 in the world, but China can only produce more than 20,000. In China's annual production of various types of bearings in common in the low end bearing account for more than 80%, all kinds of special, precision, high reliability, high-tech, high value-added products bearing account for only about 20%. And China's annual import large quantities of precisely this kind of bearing.

Industry experts point out that the existence of manufacturing standards with the international advanced level of products bearing a considerable gap, mainly in the performance, life and reliability. Such as the level of precision deep groove ball bearings Although quite close to the international advanced level, but there are still "two low and one poor", that is, low level of technology products (less variety, inconsistent quality, poor reliability, technology open to weak ), the low level of product manufacturing (process and equipment behind) and poor international market competitiveness. Such as railway bearings, a foreign country is 800,000 km of life, and we have only 500,000 km. At present, China can provide part of the quasi-high speed railway bearings, but all rely on imports of high-speed railway bearings. In addition there is a second generation, third generation wheel bearings, precision bearings drive computer hardware and software, mute motor bearings, etc., technology development capabilities are quite weak, low product quality and level of development can not meet the needs of the host.

At present, China's annual imports of ball and roller combined bearing as reached about 10 million units, but will also increase year by year, that share a considerable part of the host country support and maintenance markets fell into the others mouth. A piece of "cheese" Although tempting, but we lack the strength to share. To change this situation, industry experts believe that companies must change the current situation alone, together, focus on the integration of industry resources, technical resources, and enhance the overall strength. While continuing to strengthen the joint venture with the world's leading companies, the introduction of technology to improve the level of technology.

2014年12月12日星期五

Angular contact ball bearing

* Angular contact ball bearings have a contact angle between rings and balls, standard contact angle of 15 °, 30 ° and 40 °
* The larger the contact angle the greater the axial load capacity * smaller the contact angle is more conducive to high-speed rotation * single row bearings can bear radial load and axial load combinations * DB, DF combination and double row angular contact ball bearing can withstand radial to load and axial load * DT combination applies larger axial load, less than the rated load bearing single occasion * high speed ball bearing with ACH small diameter ball a few more, mostly for machine tool spindle * angular contact ball bearings for high-speed and high-precision rotation * on the back of a combination of the two structures for single row angular contact ball bearing inner and outer rings, can bear radial load and axial load bearing * No filling slots have sealed the main applicable Cage:
* Pressed steel cage (separate bowl ...; S-shaped, crown-shaped double row ...)
* Copper alloy or phenolic resin cutting cage, synthetic resin forming cage main purposes:
* Single row: spindle, high frequency motors, gas turbines, centrifuges, small car front wheel, the differential pinion shaft * double row: pump, blower, air compressor, various types of transmission, fuel injection pump, Printing Machinery * Four-point contact ball bearings can bear radial load and axial load * single bearings can be replaced, or a combination of the back of a positive combination of angular contact ball bearings * applies to bear pure axial load or axial load larger synthetic ingredients * loads in any direction when such bearings can withstand axial load can form one of the contact angle (α), so the rings and balls always * at any point of contact with a contact line duplicitous mainly used to maintain frame:
Cutting copper alloy cage main purposes:
Aircraft jet engines, gas turbines.