Polymer Bearings 2016 Chapter 1 by Igus

More catalogs by Igus | Polymer Bearings 2016 Chapter 1 | 246 pages | 2017-05-21

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Page 147 of Polymer Bearings 2016 Chapter 1

100 60 40 20 0 20 50 80 120 150 200 250 m/s continuous rotating 0.9 oscillating 0.7 linear 2.4 short-term 1.1 1.0 2.8 iglidur® c500 belongs to the most temperature resistant iglidur® materials similar to all thermoplastics with increasing temperatures the compressive strength of iglidur® c500 bearings decreases the temperatures prevailing in the bearing system also have an influence on the bearing wear the wear rises with increasing temperatures at temperatures over +130 °c an additional securing is required temperature [°c diagram 02 permissible maximum surface pressure as a function of temperature 110 mpa at +20 °c diagram 03 shows the elastic deformation of iglidur® c500 bearings as a function of radial pressure at the maximum permissible surface pressure of 110 mpa the deformation at room temperature is only 4.5  surface pressure page 41 10 9 8 deformation 7 6 5 4 application temperatures page 49 additional securing page 49 friction and wear the coefficients of friction and wear in iglidur® c500 are more favorable than in the other high temperature materials iglidur® x and a500 the friction value increases moderately as the sliding speed increases the friction value initially drops rapidly to less than 0.1 under loads of up to approx 20 mpa and then only marginally increases as loads continue to increase friction and wear also depend to a high degree on the reverse partner shafts that are too smooth increase both the coefficient of friction and the wear of the bearing the ideal shaft has an average surface finish of ra 0.6 to 0.8 µm coefficients of friction and surfaces page 47 wear resistance page 50 1 0 0 25 pressure [mpa  50 75 100 +23 °c 0.00 120 +60 °c 0.20 0.25 0.30 0.35 0.40 diagram 04 coefficient of friction as a function of the surface speed p 1 mpa 304 stainless steel 0 diagram 06 wear rotating with different shaft materials pressure p 1 mpa v 0.3 m/s 200 180 0.35 160 0.30 140 0.25 100 120 0.20 0.15 0.10 0.05 80 60 40 20 0 0 0.00 0 10 20 30 40 50 60 70 80 load [mpa diagram 05 coefficient of friction as a function of the pressure v 0.01 m/s shaft materials diagram 06 shows the test results of iglidur® c500 bearings running against various shaft materials using the example of a rotating motion at 1 mpa and a speed of 0.3 m/s it becomes apparent that iglidur® c500 has very consistent wear characteristics across a variety of shaft types this wear rate spikes upward in combination with free-machining steel and notably so spikes downward in combination with hc aluminium the wear under rotational loads is higher specifically with increasing radial loads as compared to pivoting motions diagram 07 shaft materials page 52 iglidur® c500 c. o. f µ www.igus.co.uk/c500 dry greases 0.07–0.19 0.09 oil 0.04 water 0.04 table 04 coefficient of friction against steel ra 1 µm 50 hrc diagram 03 deformation under pressure and temperature 310 online tools and more information 0.15 1 hr carbon steel 0.05 2 cf53 hard chromed 0.10 5 10 15 20 25 30 rotating pressure [mpa  35 40 45 oscillating diagram 07 wear for oscillating and rotating applica­ tions with shaft material cf53 hardened and ground steel as a function of the pressure installation tolerances 3 2 3 0.15 surface speed [m/s temperatures 80 0.20 0.10 surface speed page 44 table 03 maximum surface speeds 120 4 cf53 steel 0.25 automatic screw steel the maximum allowable sliding speed is based on the friction heat generated at the bearing surface the temperature should only be permitted to increase to a value that will ensure a sustainable use of the bearing with respect to wear and dimensional integrity the maximum values stated in table 03 are valid only with minimum pressure loads and are often not attained in practice 5 h.a aluminium 0.30 wear [µm/km with increasing temperatures the compressive strength of iglidur® c500 plain bearings decreases the diagram 02 shows this relationship however at an operation temperature of +200 °c the permissible surface pressure is close to 20 mpa the permissible maximum surface pressure is a mechanical material parameter no conclusions regarding the tribological properties can be drawn from this permissible surface speeds wear [µm/km mechanical properties load [mpa iglidur c500 technical data coefficient of friction [µ iglidur® c500 is a member of the family of extremely media and temperature resistant iglidur® materials x x6 and a500 this material is characterised by improved wear resistance and increased design flexibility – for instance as a piston ring c500 +250 °c 110 mpa ® high grade steel iglidur c500 technical data ® coefficient of friction [µ c500 +250 °c 110 mpa  iglidur® c500 plain bearings are standard bearings for shafts with h-tolerance recommended minimum h9 the bearings are designed for pressfit into a housing machined to a h7 tolerance after being assembled into a nominal size housing in standard cases the inner diameter automatically adjusts to the f10 tolerances testing methods page 57 diameter d1 [mm up to 3 shaft h9 [mm 0–0.025 iglidur® c500 f10 [mm +0.006 +0.046 housing h7 [mm 0 +0.010 3 to 6 to 10 to 18 to 30 to 50 to 0–0.030 0–0.036 0–0.043 0–0.052 0–0.062 0–0.074 +0.010 +0.058 +0.013 +0.071 +0.016 +0.086 +0.020 +0.104 +0.025 +0.125 +0.030 +0.150 0 +0.012 0 +0.015 0 +0.018 0 +0.021 0 +0.025 0 +0.030 6 10 18 30 50 80 table 05 important tolerances for plain bearings according to iso 3547-1 after pressfit 3d-cad files prices and delivery time online www.igus.co.uk/c500 311