Materials & Heat Treatment
ferrule
(1) Without flange. Bearing steel GCR15, solid quenched, MRC (hardness) 58-62.
(2) Flange. 55, 655MN, etc., case quenched, MRC (hardness) 58-64.
Rolling elements
(1) Balls. Bearing steel GCR15 integral quenching, MRC 58-64.
(2) Rollers. Ditto.
Cage
(1) Engineering plastics: nylon + 25% glass fiber, lighter, less centrifugal force.
(2) Metals: steel, copper, aluminum, alloy, heavier, centrifugal force is larger.
Seals
(1) Single lip. Friction, waterproof, dustproof.
(2) Lips. Friction, waterproof, dustproof.
(3) Card type. Friction, waterproof, dustproof.
Three sealing methods, increasing in an incremental manner
tolerance
Without flanges. Similar to ordinary bearing class 0
Flanged. Splines, flanges
Surface roughness
Same as class 0 bearing, mating surface Ra 2.5μm
Clearance
(1) Radial clearance. Inner and outer ring matching time: calculate α (contact angle), R (distance between two channels), DN (steel ball), etc.
(2) Axial clearance. When using, GB 0.07-0.1mm or according to customer's requirements.
Residual magnetism
vibration
(1) Speed (standard), rotational speed, high, medium and low wave (there is no standard for classification, roughly three frequency bands), standard ZV1~ZV4
(2) Acceleration, rotational speed, high, medium and low wave, standard Z1~Z4
Appearance quality
Cracks, rust, bumps, black skin
life span
(1) Simulation experiments. In-plant testing machine (accelerated)
(2) Endurance test. Wild land in the factory (cold, heat, humidity, drought)
