亚洲第一欧美的日产

    <big id="9qfpz"><em id="9qfpz"></em></big>
  1. <source id="9qfpz"></source>

  2. 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

     

    Be Our Distributors

    Click here to apply for FK agent

    Be Our Distributors
    亚洲第一欧美的日产
      <big id="9qfpz"><em id="9qfpz"></em></big>
    1. <source id="9qfpz"></source>