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      1. 1.Materials of Bearings

        The materials of the race and ball of bearing require enough hardness and the following qualities:
        (1). Large fatigue strength against repeated stress due to fatigue fracture of the race surface which governs the life of the bearings.
        (2). High limit of elasticity and high yield strength to prevent deformation when a large load is applied per unit area.
        (3). Large abrasion resistance against sliding friction between the retainer and the ball.
        (4). High strength against crack due to impact load and failure caused by improper fitting etc.
        (5).Small secular change in dimension and shape due to change of structure or internal stress.
        GCr15 Steel <JIS G4805>(High carbon chromium bearing steel) satisfies the above comparatively well, and its chemical composition is shown in the following table.
         

        Chemical composition of high carbon chromium bearing steel 

        Class Standard Symbol                                                    Chemical Composition (%)
        C Si Mn P S Cr
        1 GB GCr15 0.98-1.10 0.15-0.35 <0.50 <0.025 <0.025 1.30-1.60
        DIN 100Cr6
        ASTM E5200
        JIS SUJ2
        2 GB 9Cr18 0.98-1.10 <1.00 <1.00 <0.025 <0.025 16.00-18.00
        DIN X105CrMO17
        ASTM 440C
        JIS SUC440C

        In order to maitain uniform qualit of materials, FK keeps fully equipped installations and performs strict acceotance tests and inspections based on the strict acceptance standards in addition to JIS-standards. 

        Kinds of test done at the FK are mainly chemical analysis, magnetic exploration, ultrasonic exploration, corrosion by strong acid, inspection of structure by naked eyes, inspection of structure by microscope, crusher test and hardness etc.


        2.Material of the Cage and the Rivet

         The material of cage is JIS G3141(Cold rolled carbon steel sheet and strip)SPCC, and it is formed by the press.
        The material of the rivet is JIS G3507 (Low carbon steel wire rods)SWRCH 12A.
         

        3.Materials of Housings

        The material of the housings is FC200 JIS G5501 (Gray iron casting) and the mechanical properties are shown in the following table. 

                                              Mechanical properties of Gray cast iron HT200 

        symbol

        Thickness
        (mm)

        Dia. Of
        testing bar
        (mm)

        Tension test

        Traverse braking
        Test

        Pressure
        Strength

        Hardness
        Test

        Tensile
        Strength

        Bender
        Strength

        Deflection

         

        Hardness

        (kgf/mm2)

        (kgf/mm)

        (mm)

        kgf/mm2

        (HB)

        HT200
        (FC200)

        Over 6-8

        13

        Over 23

        53

        1.8

        75

        187-255

        Over 8-15

        20

        Over 22

        45

        2.5

        75

        170-241

        Over 15-30

        30

        Over 20

        40

        2.5

        75

        170-241

        Over 30-50

        45

        Over 17

        34

        3.0

        75

        170-241

        Over 50

        60

        Over 16

        31

        4.5

        75

        163-229

        Other Materials of Housings

        Symbol

        JIS number

        FCD40(QT400)

        JIS G5502

        SPCC(08)

        JIS G3141

        SUS304

        JIS G4304

        4.Materials of Other Components

        Components

        Materials used

        JIS symbols

        JIS number

        Sleeve for adapter

        Carbon steel for machine structural use

        S25C

        JIS G4051

        Nut for adapter

        Carbon steel for machine structural use

        S25C

        JIS G4051

        Washer for adapter

        Cold rolled carbon steel sheet and strip

        SPCC

        JIS G3141

        Oil seal

        Synthetic nitrile rubber

        -

        -

        Slinger

        Cold rolled carbon steel sheet and strip

        SPCC

        JIS G3141

        Hexagon set screw

        Nickel chromium molybdenum steel

        SCM 435

        JIS G4105

        Hexagon wrench key

        Nickel chromium molybdenum steel

        SNCM630

        JIS G4103

        Grease nipple

        Free cutting brass bar

        C3604

        JIS H3250

         

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