A: koyo bearings advantages:
An abrasion - due to the ceramic material as an inert material, it is more resistant to corrosion and wear;
2, long life and wear resistance - full ceramic koyo bearing fatigue life is expected to more than koyo bearings 10-50 times, mixed ceramic koyo bearings, the life expectancy is about 3-5 times higher than the life of koyo bearings;
High speed and acceleration capability - can operate in conditions of dn value of over 3 million, and the skid, wear and heat can be reduced;
, High temperature - ceramic koyo bearing 500. c above temperature work;
5, rigidity - due to the elastic modulus of the ceramic material, its rigid than ordinary steel koyo bearing large 15-20%;
Required lubrication rarely - low coefficient of friction of ceramic materials, ceramic koyo bearings with oil lubrication, the lubricant thinning or depleted oil, the lubricating ability is still lower than the steel koyo bearings commonly used in traditional lubrication agent;
7, the torque is low - according to the structure, ceramic koyo bearing torque of about 1/3 smaller;
Quenched and tempered steel characteristics:
1 hardenability steel:
The type of steel oil quenched directly in the 40 ~ 60n, m commonly used in steel, chrome molybdenum steel, chromium, manganese steel, etc.. The common grades of 35 (jrmn, 42crmo, 35l: rmnv, 40crmn 35crmnsi, 30crmnsi 35 (: rmnti, 40crmnti, 40crni such as, chromium molybdenum steel with high hardenability, good high temperature strength and organizational stability, to eliminate back fire brittleness 42crmo used to manufacture high strength requirements, section quenched and tempered parts such as gears, turbine generator main shaft by the load of the connecting rod, etc., also can be manufactured in 5 (:) o The ℃ below part of long-term work; high hardenability and strength of chromium-manganese steel, the toughness does not reduce the 30 (: rmnsi high strength steel with good weldability and is used to manufacture high pressure blowers, compressed tablets, high-speed load wheel axis and other important parts.
(2) high hardenability steel:
The critical diameter of the type of steel oil cooling in the 60 ~ 1 oo mm. Common steel grades 30mn2mow, 40crmnmo, 30 (: rni3, 37crni3, 40crnimc), 45crnimov, 25cr2ni4w etc. 40crmnmo high hardenability steel, has a temper brittleness, overheating tendencies of other small features, used to produce cross-sectional large area, high strength and high toughness of the parts, such as the axle of the large heavy vehicles.
(3) low-hardenability steel:
Generally used to make the cross-section of small and unimportant parts; chrome steel has good hardenability, with high tempering stability than carbon steel, quenching temperature wide, not easy to overheating, deformation, cracking tendency, it is widely used; similar to the role of the manganese steel and chrome steel, manganese, so that the critical cooling rate of steel greatly reduced, to improve the strength and hardness of the steel; boron steel, boron significantly improves the hardenability of steel, its performance is close to 40cr critical diameter oil quenched in the 20 ~ 30mm, often used as a vehicle axle, worm, spline shaft.
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