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Universal Matched Pair Angular Contact Ball Bearing

Universal Matched Pair Angular Contact Ball Bearing

7000DB-7022DB, 7024DB, 7026DB, 7028DB...7040DB; 7200DBD....7240BDB, 7300DBD....7340BDB; 7905DB....7960DB

1. Precision

The precision of a spindle bearing does affect the guiding properties as well as lifetime, especially with applications at max. speed.  HTH high precision bearings are manufactured to precision class 4,calss 2 and class 5 (P4, P2 and P5) as well as ABEC 7, ABEC 9 and ABEC 5.

For special applications, e.g. vacuum pumps, gyroscopes as well as measuring engineering and optical systems, HTH manufactures bearings to the internal tolerance classes HG (high precision) and UP (ultra precision). Apart from the requirements mentioned, the tolerance classes contain additional selection criteria. The relationship between the various standards are explained below.

GB/T30794

ISO

DIN

AFBMA

C

Class 4

P4

ABEC7

B

Class 2

P2

ABEC 9

D

Class 5

P5

ABEC5

2. Contact angle 

The contact angle is formed by a straight line drawn between the points of contact of the balls with the raceways and a plane perpendicular to the bearing axis. Externally applied loads are transmitted from one ring to the other along this line.

The contact angle is designed into the bearing and changes during operation with the speed, the external forces and the difference in temperature between the inner and the outer ring.

With increasing contact angle

a. Limiting speed decreases

b. Radial rigidity decreases

c. Axial rigidity increases

HTH manufactures spindle bearings with 15°, 25°, 30° and 40°contact angles. Other contact angles available on request. 

3. Material

Careful selection of material is a factor when applications require bearings to provide superior hardness and anti-corrosion or heat-resistance. So we always choose standard materials.

Chrome Steel:

SpecSymbolChemical  Composition (wt%)
CSiMnPSCrMo
JISSUJ20.95~1.100.15~0.350.50 MAX0.025 MAX0.025 MAX1.30~1.60-
ASTM/AISI/SAEE521000.98~1.100.15~0.350.25~0.450.025 MAX0.025 MAX1.30~1.60-
GBGCr150.95~1.050.15~0.350.20~0.400.027 MAX0.020 MAX1.30~1.65-

4. Lubrication


5. How HTH to make  heat Treatment for bearings

Heat-treatments consisted of preheating samples at 843 C (1550 F) using a Sybron Thermolyne 30400 furnace, and then austenitizing samples in a Keith furnace at temperatures of 843-1215 C (1550-2220 F); immediately followed by warm high-speed oil quenching at 48.9 C (120 F). Pre-heating was done to ramp the temperature of the samples prior to austenitizing and to prevent thermal shock.

One heat treatment per steel was carried out with cryogenic quenching at -48.9 C (-120 F) immediately after oil quenching to increase the formation of marten site. The cryogenic quench was prepared by submerging dry ice into ethanol.

The final step was tempering, it was conducted at temperatures ranging from 135 to 537 C (275-1000 F). 

More information please contact us: tang@fycbearings.com

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Xi'an Weinuo Machinery And Equipment Co.,Ltd

Add: Room 1101, Block 9 Taihua Jinmao International Plaza, No.16 South of Fenghui Road,      High-tech Zone, Xi’an, Shannxi Province, China 

Tel: 86 29 88332871  88324190

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E mail: tang@fycbearings.com

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