Page 150 - IGUS Bearing
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iglidur  K                                                                                                                                                                                                              iglidur  K
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         +170°C                                                                                                                                                                                                                   +170°C
          50MPa                                                                                                                                                                                                                   50MPa
                      Bearing technology | Plain bearings | iglidur  K                                                              Technical data
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          Permissible surface speeds                         Installation tolerances                                                  100.0                                               0.25
                                                                                                                                                                                          0.24
          iglidur  K has been developed for low to medium surface   iglidur  K plain bearings are standard bearings for shafts         10.0                                               0.23
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          speeds. The maximum values shown in table 03 can only   with  h-tolerance (recommended minimum  h9).  The                                                                       0.22
                                                                                                                                                                                          0.21
          be achieved at low pressures. At the given speeds, friction   bearings are designed for press-fit into a housing machined     1.0                                               0.20
          can cause a temperature increase to maximum permissible   to a H7 tolerance. After being assembled into a nominal                                                               0.19
          levels. In practice, though, this level is rarely reached due   size housing, the inner diameter automatically adjusts to   Surface pressure [MPa]  0.1                       Coefficient of friction [µ]  0.18
                                                                                                                                                                                          0.17
          to varying application conditions.                 the E10 tolerances. For particular dimensions the tolerance                                                                  0.16
          Surface speed, page 48                             differs depending on the wall thickness (please see product               0.01  0.001   0.01     0.1      1.0      10.0      0.15
                                                             range table). In relation to the installation tolerance, the                                                                      0     10    20    30    40    50    60
          Temperature                                        inner diameter changes with the absorption of humidity.                  Surface speed [m/s]                                Load [MPa]
          The temperatures prevailing in the bearing system also   Testing methods, page 61                                         Diagram 01: Permissible pv values for iglidur  K plain bearing   Diagram 05: Coefficient of friction as a function of the
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          have an influence on the wear. With increasing temperatures,                                                              with a wall thickness of 1 mm dry operation against a steel   pressure, v = 0.01m/s
          the wear increases and this effect is significant when                                                                    shaft at +20°C, mounted in a steel housing.
          temperatures rise over +100°C. For temperatures over   Chemicals                     Resistance
          +70°C an additional securing is required.           Alcohols                          + up to 0                               80                                                  8
          Application temperatures, page 53                   Diluted acids                     0 up to –                                                                                   7
          Additional securing, page 53                        Diluted alkalines                    +                                    60                                                  6
                                                              Fuels                                +                                                                                        5
          Friction and wear                                   Greases, oils without additives      +                                    40                                                  4          Free cutting steel   Cf53, hard chromed  304 stainless steel
          Similar to wear resistance, the coefficient of friction µ also   Hydrocarbons            +                                    20                                                  3     H.a. aluminium       HR carbon steel  High grade steel
                                                                                                                                                                                            2
          changes with the surface speed and load (diagrams 04   Strong acids                       –                                                                                   Wear [µm/km]  1     Cf53 steel
          and 05).                                            Strong alkalines                     0                                 Load [MPa]  0                                          0
          Coefficient of friction and surfaces, page 51      All data given at room temperature [+20°C]                                    20      50     80     120     150    170
          Wear resistance, page 54                           Table 02: Chemical resistance                                            Temperature [°C]
                                                             Chemical table, page 1170                                              Diagram 02: Maximum recommended surface pressure as a   Diagram 06: Wear, rotating with different shaft materials,
          Shaft materials                                                                                                           function of temperature (50MPa at +20°C)           pressure, p = 1MPa, v = 0.3m/s
          The friction and wear are also dependent, to a large                 Rotating Oscillating   linear
          degree, on the mating partner. Shafts that are too smooth   Long-term  m/s  1.0   0.7        3.0                              5.0                                                45
          increase both the coefficient of friction and the wear of   Short-term  m/s  2.0  1.4        4.0                                                                                 40         rotating
          the bearing. For iglidur  K a ground surface with an   Table 03: Maximum surface speeds                                       4.0      +23°C                                     35         oscillating
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                                                                                                                                                                                           30
          average surface finish Ra = 0.15-0.2µm is recommended.                                                                        3.0      +60°C                                     25
          Diagram 06 shows results of testing different shaft                      Dry    Greases Oil  Water                            2.0                                                20
          materials with plain bearings made from iglidur  K. It   Coefficient of friction μ 0.06-0.21  0.09  0.04  0.04                                                                   15
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          is important to notice that with increasing loads, the   Table 04: Coefficient of friction against steel (Ra = 1μm,        Deformation [%]  1.0                               Wear [µm/km]  10
                                                                                                                                                                                            5
          recommended hardness of the shaft increases. The "soft"   50HRC)                                                              0.0                                                 0
          shafts tend to wear more easily and thus increase the                                                                            0     10     20    30    40    50    60             0     10    20    30    40    50    60
          wear of the overall system, if the loads exceed 2MPa.           Housing   Plain bearings   Shaft                            Load [MPa]                                         Load [MPa]
          The comparison of rotation and pivoting shows that the   Ø d1 [mm]  H7 [mm]  E10 [mm]    h9 [mm]                          Diagram 03: Deformation under pressure and temperature  Diagram 07: Wear for oscillating and rotating applications
          wear is almost identical at a pressure up to 5MPa. The   0-3  +0.000 +0.010 +0.014 +0.054 -0.025 +0.000                                                                      with shaft material Cf53 hardened and ground steel, as a
          higher the loads, the greater the difference (diagram 07).    > 3-6  +0.000 +0.012 +0.020 +0.068 -0.030 +0.000                                                               function of the load
                                                              > 6-10    +0.000 +0.015 +0.025 +0.083 -0.036 +0.000                      0.30
          Shaft materials, page 56                            > 10-18   +0.000 +0.018 +0.032 +0.102 -0.043 +0.000
                                                              > 18-30   +0.000 +0.021 +0.040 +0.124 -0.052 +0.000                      0.25
                                                              > 30-50   +0.000 +0.025 +0.050 +0.150 -0.062 +0.000
                                                              > 50-80   +0.000 +0.030 +0.060 +0.180 -0.074 +0.000                    Coefficient of friction [µ]  0.20
                                                              > 80-120  +0.000 +0.035 +0.072 +0.212 -0.087 +0.000
                                                              > 120-180  +0.000 +0.040 +0.085 +0.245 -0.100 +0.000
                                                             Table 05: Important tolerances for plain bearings according               0.15  0.05  0.10  0.15  0.20  0.25  0.30  0.35
                                                             to ISO 3547-1 after press-fit                                            Surface speed [m/s]
                                                                                                                 ASEAN 09/2023   ASEAN 09/2023  Diagram 04: Coefficient of friction as a function of the

                                                                                                                                    surface speed, p = 0.75MPa

          148   3D-CAD, finder and service life calculation ... www.igus-asean.com/K                                                                            Lubrication-free made easy ... from stock ... no minimum order quantity  149
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