Page 407 - IGUS Bearing
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iglidur  A181                                                                                                                                                                                                            iglidur  A181
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          +90°C                                                                                                                                                                                                                   +90°C
          31MPa                                                                                                                                                                                                                   31MPa
                      Bearing technology | Plain bearings | iglidur  A181                                                           Technical data
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                                                                                                                                      100.0                                               0.26
                                                              Chemicals                        Resistance
          Temperature                                         Alcohols                             +                                   10.0                                               0.23
          The long-term upper temperature limit of +90°C permits   Diluted acids                0 up to –                                                                                 0.20
          the broad use in applications with direct contact with food.   Diluted alkalines         +                                    1.0                                               0.17
          As shown in diagram 02, with increasing temperatures,   Fuels                            +                                                                                      0.14
          the compressive strength decreases. When considering   Greases, oils without additives   +                                 Surface pressure [MPa]  0.1                        Coefficient of friction [µ]  0.11
          temperatures, the additional frictional heat in the bearing   Hydrocarbons               +                                                                                      0.08
                                                                                                                                                                                          0.05
          system must be taken into account. For temperatures over   Strong acids                   –                                  0.01  0.001   0.01     0.1      1.0      10.0           0     5     10    15    20    25    30
          +60°C an additional securing is required.           Strong alkalines                  + up to 0
          Application temperatures, page 53                                                                                           Surface speed [m/s]                                Load [MPa]
          Additional securing, page 53                       All data given at room temperature [+20°C]                             Diagram 01: Permissible pv values for iglidur  A181 with a   Diagram 05: Coefficient of friction as a function of the
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                                                             Table 02: Chemical resistance
                                                             Chemical table, page 1170                                              wall thickness of 1mm dry operation against a steel shaft at   pressure, v = 0.01m/s
          Friction and wear                                                                                                         +20°C, mounted in a steel housing
          Similar to wear resistance, the coefficient of friction µ also         Rotating Oscillating  linear
          changes with the surface speed and load (diagram 04 and   Long-term  m/s  0.8     0.6        3.5                              40                                                 3.0
          05). For iglidur  A181 plain bearings, the alteration of the   Short-term  m/s  1.2  1.0     5.0                              35                                                 2.5
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          coefficient of friction μ depends on surface speed and the                                                                    30
          shaft surface finish.                              Table 03: Maximum surface speeds                                           25                                                 2.0
          Coefficient of friction and surfaces, page 51                            Dry    Greases Oil  Water                            20                                                 1.5         Free cutting steel   Cf53, hard chromed  304 stainless steel
          Wear resistance, page 54                                                                                                      15                                                 1.0    H.a. aluminium       HR carbon steel  High grade steel
                                                              Coefficient of friction μ 0.10-0.21  0.08  0.03  0.04                     10                                                 0.5              Cf53 steel
                                                             Table 04: Coefficient of friction against steel (Ra = 1μm,              Load [MPa]  5                                      Wear [µm/km]
          Shaft materials                                                                                                                0                                                 0.0
          Diagram 06 shows results of testing different shaft   50HRC)                                                                     20    30   40   50   60    70   80   90
          materials with plain bearings made from iglidur  A181.          Housing   Plain bearings   Shaft                            Temperature [°C]
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          Particular attention is paid in the food industry to the   Ø d1 [mm]  H7 [mm]  E10 [mm]  h9 [mm]                          Diagram 02: Maximum recommended surface pressure as a   Diagram 06: Wear, rotating with different shaft materials,
          corrosion- resistant shaft types. Diagram 06 shows that   0-3  +0.000 +0.010 +0.014 +0.054 -0.025 +0.000                  function of temperature (31MPa at +20°C)           pressure, p = 1MPa, v = 0.3m/s
          very low wear rates can be achieved in combination with   > 3-6  +0.000 +0.012 +0.020 +0.068 -0.030 +0.000
          these shafts. As with many of the iglidur  materials, wear   > 6-10  +0.000 +0.015 +0.025 +0.083 -0.036 +0.000                10                                                 200
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          rate increases with otherwise identical parameters in   > 10-18  +0.000 +0.018 +0.032 +0.102 -0.043 +0.000                                                                                  rotating
          rotation (diagram 07).                              > 18-30   +0.000 +0.021 +0.040 +0.124 -0.052 +0.000                        8       +23°C                                     150        oscillating
          Shaft materials, page 56                                                                                                       6       +60°C
                                                              > 30-50   +0.000 +0.025 +0.050 +0.150 -0.062 +0.000                                                                          100
                                                              > 50-80   +0.000 +0.030 +0.060 +0.180 -0.074 +0.000                        4
          Installation tolerances                             > 80-120  +0.000 +0.035 +0.072 +0.212 -0.087 +0.000                                                                          50
          iglidur  A181 plain bearings are standard bearings for   > 120-180  +0.000 +0.040 +0.085 +0.245 -0.100 +0.000              Deformation [%]  2                                 Wear [µm/km]
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          shafts with h-tolerance (recommended minimum h9). The                                                                          0                                                  0
          bearings are designed for press-fit into a housing machined   Table 05: Important tolerances for plain bearings according        0     5    10   15   20    25   30   35             0           15          30          45
          to a H7 tolerance. After being assembled into a nominal   to ISO 3547-1 after press-fit                                     Load [MPa]                                         Load [MPa]
          size housing, the inner diameter automatically adjusts to                                                                 Diagram 03: Deformation under pressure and temperature  Diagram 07: Wear for oscillating and rotating applications
          the E10 tolerances.                                                                                                                                                          with shaft material Cf53 hardened and ground steel, as a
          Testing methods, page 61                                                                                                                                                     function of the load
                                                                                                                                        0.4

                                                                                                                                        0.3
                                                                                                                                     Coefficient of friction [µ]  0.2



                                                                                                                                        0.1

                                                                                                                                        0.0
                                                                                                                                           0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
                                                                                                                                      Surface speed [m/s]
                                                                                                                 ASEAN 09/2023   ASEAN 09/2023  surface speed, p = 1MPa
                                                                                                                                    Diagram 04: Coefficient of friction as a function of the



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