Page 59 - IGUS Bearing

iglidur | Technical data
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Wear and shaft materials

The shaft is, apart from the plain bearing itself, the most The low wear results of the systems with hard-chromed 15 15
important parameter in a bearing system. It is in direct shafts are especially impressive. This very hard, but also
contact with the bearing, and like the bearing, it is affected smooth shaft gives excellent results on the wear behaviour 12 12
by relative motion. The shaft will wear in any case. Modern with many bearing combinations.The wear of many iglidur 9 9
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bearing systems however are designed in a way that the plain bearings is lower on this shaft than on any other
wear of the shafts is so small that it cannot be detected with shaft material tested. However, it should be pointed out 6 6
traditional methods of measurement technology. Shafts can that because of the low surface roughness, the danger of 3 3
be distinguished and classified according to their hardness stick-slip on hard-chromed shafts is especially high. Wear [µm/km] M250 W300 J350 A180 Wear [µm/km] M250 W300 J350 A180
and according to the surface finish. With high-grade steel, a similarly good result is obtained. 0 G P J J3 X Z X6 H1 0 G P J J3 X Z X6 H1
Cf53 standard shafts give very good results, too. With Diagram 13: Wear with Cf53 shaft, Diagram 17: Wear with hard-anodised
u Coefficient of friction, page 51 other shaft materials, the wear results vary considerably. p = 1MPa, v = 0.30m/s, Ra = 0.20μm aluminium shaft, p = 1MPa, v = 0.30m/s,
u Wear resistance, page 54 For example, in tests with 304 stainless steel shafts at low Ra = 0.20μm
loads, extremely positive results can be found with the right 15 15
The hardness of the shaft also plays an important role. When bearing material. It must be said on the other side, that no
the shafts are less hard, the shaft is worn smooth during other shaft material shows a bigger variation of wear results 12 12
the break-in phase. Abrasive points are worn off and the with different bearing materials. Therefore, the choice of the 9 9
surface is rebuilt. For some materials, this effect has positive most suitable bearing material is particularly important with
influences, and the wear resistance of the polymer bearing the shaft materials 304 stainless steel and HR carbon steel. 6 6
increases. In the following graphs, the most common The test results give only a sample of the existing data. All of 3 3
shaft materials are listed and the iglidur materials that the results shown were made with same loads and speeds. Wear [µm/km] M250 W300 J350 A180 Wear [µm/km] M250 W300 J350 A180
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are best suited are compared. For easier comparison, the 0 G P J J3 X Z X6 H1 0 G P J J3 X Z X6 H1
scaling of the wear axis is the same in all graphs. Diagram 14: Wear with 304 stainless steel Diagram 18: Wear with free cutting steel
shaft, p = 1MPa, v = 0.30m/s, Ra = 0.20μm shaft, p = 1MPa, v = 0.30m/s, Ra = 0.20μm

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Wear [µm/km] 3 G M250 P J W300 J3 J350 X Z X6 H1 A180 Wear [µm/km] 3 G M250 P J W300 J3 J350 X Z X6 H1 A180

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Diagram 15: Wear with HR carbon steel shaft, 0 Diagram 19: Wear with high grade steel shaft,
p = 1MPa, v = 0.30m/s, Ra = 0.20μm p = 1MPa, v = 0.30m/s, Ra = 0.20μm

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12
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Wear [µm/km] 3 G M250 P J W300 J3 J350 X Z X6 H1 A180

Picture 10: Pivoting wear test rig for testing the wear Picture 11: Pivoting wear test rig for testing the wear 0 Diagram 16: Wear with Cf53 hard-chromed
in pivoting movements at low loads in pivoting movements at medium loads shaft, p = 1MPa, v = 0.30m/s, Ra = 0.20μm
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