iglidur Low water absorption

Transcription

1 iglidur Versatile, waterproof. With the iglidur plain bearing, the user has a cost-effective, maintenance-free plain bearing. Compared to iglidur G plain bearings made of iglidur are better suited to rotating movements and high loads, as well as being effectively waterproof. Low water absorption Low wear rates When to use it? When very low water absorption is needed When a cost-effective bearing for high pressure loads is desired For rotating movements under high loads When high precision in high humidity and moderately high temperatures are needed Cost-effective When not to use it? When the maximum application temperature is above +12 C iglidur K, page 175 When mechanical reaming of the wall surface is necessary iglidur M25, page 7 When the highest wear resistance is needed iglidur W3, page 131 Low wear rates Temperature roduct range +13º 4º 2 types Ø 3 95 mm more dimensions on request 186 More information

2 Application Examples iglidur Typical sectors of industry and application areas Solar technology Sports and leisure Machine Building Doors and gates Railway industry etc. Improve technology and reduce costs 3 exciting examples for iglidur plain bearings online igus GmbH Cologne hone +49 () Fax

3 iglidur Technical Data Material data General properties Unit iglidur Testing method Density g/cm Colour Max. moisture absorption at +23 C/5 % r.h. % weight.2 DIN Max. moisture absorption % weight.4 black Coefficient of sliding friction, dynamic against steel µ.6.21 pv value, max. (dry) Ma m/s,39 Mechanical properties Modulus of elasticity Ma 5,3 DIN Tensile strength at +2 C Ma 12 DIN Compressive strength Ma 66 Max. recommended surface pressure (+2 C) Ma 5 Shore D hardness 75 DIN 5355 hysical and thermal properties Max. long term application temperature C +13 Max. short term application temperature C +2 Min. application temperature C 4 Thermal conductivity W/m K.25 ASTM C 177 Coefficient of thermal expansion (at +23 C) K DIN Electrical properties Specific volume resistance Ωcm > 13 DIN IEC 93 Surface resistance Ω > 12 DIN Table 1: Material data 1. ressure [Ma].1.1 Surface speed [m/s] Graph 1: ermissible pv values for iglidur with a wall thickness of 1 mm dry running against a steel shaft at +2 C, mounted in a steel housing 188 Lifetime calculation, CAD files and much more support

4 Technical Data iglidur Mechanical roperties The recommended maximum surface pressure is a mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this. With increasing temperatures, the compressive strength of iglidur plain bearings decreases. The Graph 2 shows this inverse relationship. However, at the longterm maximum temperature of +13 C the permissible surface pressure is almost 15 Ma. ressure [Ma] Temperature [ C] Graph 2: Recommended maximum surface pressure as a function of temperature (5 Ma at +2 C) With the iglidur plain bearing, the user has a costeffective, maintenance-free plain bearing. Compared to iglidur G, plain bearings made of iglidur are better suited for rotating movements and high loads. Graph 3 shows the elastic deformation of iglidur for radial loads. At the recommended maximum surface pressure of 5 Ma the deformation is less than 3 %. ermissible Surface Speeds lain bearings made of iglidur are maintenance-free plain bearings, which were developed for low to average surface speeds. The maximum values given in table 2 can only be achieved at a very low surface pressure. The maximum speed given is the speed at which an increase up to the continuous use temperature occurs due to friction. Surface Speed, page 45 m/s Rotating Oscillating Linear Continuous Short term Table 2: Maximum running speed Temperatures Even at its highest long term application temperature of +12 C, iglidur does not quite reach the values of iglidur G. The ambient temperatures in the bearing system also have an effect on the bearing wear. With increasing temperatures, the wear increases. Application Temperatures, page 46 iglidur Application temperature Minimum 4 C Max. long term +13 C Max. short term +2 C Add. securing is required from +9 C Table 3: Temperature limits Deformation [%] Surface ressure, page ressure [Ma] +23 C +6 C Graph 3: Deformation under pressure and temperature Friction and Wear Just as the wear resistance, the coefficient of friction changes greatly with increasing load. With regard to iglidur, the coefficient of friction increases slightly when the speed increases (Graph 4). Graph 5 shows how the coefficient of friction drops when the load increases. Starting at approximately 6 Ma, the coefficient of friction is already below.1. iglidur plain bearings obtain a minimum coefficient of friction on shafts with a roughness Ra from.1 to.2 µm. Both smoother and rougher shaft finishes cause the friction to clearly increase. Coefficients of Friction and Surfaces, page 48 Wear Resistance, page 49 igus GmbH Cologne hone +49 () Fax

5 iglidur Technical Data.4.4 Coefficient of friction [µ] Surface speed [m/s] Coefficient of friction [µ] Shaft roughness Ra [µm] Graph 4: Coefficient of friction as a function of the running speed, p =.75 Ma Graph 6: Coefficient of friction as function of the shaft surface (Cf53 hardened and ground steel) Coefficient of friction [µ] ressure [Ma] Graph 5: Coefficient of friction as a function of the pressure, v =,1 m/s Shaft Materials Graphs 6 to show results of testing different shaft materials with plain bearings made of iglidur. For rotating movements, the wear of iglidur with Cold Rolled Steel and HR Carbon Steel shafts is very low. On the other hand, the bearings on 34 Stainless Steel shafts as well as hard-chromed shafts result in higher wear than other shaft materials even in the low load range. For example at a load of 2 Ma, Cold Rolled Steel is six times better than 34 Stainless Steel. For oscillating movements without loads wear rates are lower than for most rotating movements. For this purpose, the Cold Rolled Steel and hard chromed shafts prove to be the best sliding partners. Also, the 34 Stainless Steel shafts that have poor results for rotation are very good in oscillating operation. Wear [µm/km] Graph 7: Wear, rotating with different shaft materials, pressure p =.75 Ma, v =.5 m/s Wear [µm/km] H. a. aluminum Automatic screw steel Cf53 Cf53, hard chromed HR carbon steel 34 SS High grade steel ressure [Ma] Cf53 34 SS HR carbon steel hard chromed Graph 8: Wear with different shaft materials in rotational operation, as a function of the pressure Shaft Materials, page Lifetime calculation, CAD files and much more support

6 Technical Data iglidur Additional roperties Wear [µm/km] Chemical Resistance iglidur plain bearings have a good resistance to chemicals. They are resistant to most lubricants. iglidur is not attacked by most weak organic and inorganic acids. Chemical Table, page 974 ressure [Ma] rotating oscillating Graph 9: Wear for oscillating and rotating applications with shaft material Cf53 hardened and ground steel, as a function of the pressure Wear [µm/km] Cf53 hard steel chromed rotating 34 stainl. HR carbon steel steel oscillating Graph : Wear for rotating and oscillating applications with different shaft materials, p = 2 Ma iglidur Dry Greases Oil Water C. o. f. µ,6, Table 4: Coefficient of friction against steel (Ra = 1 µm, 5 HRC) Medium Resistance Alcohol + Hydrocarbons Greases, oils without additives + Fuels + Diluted acids Strong acids Diluted alkalines Strong alkalines + resistant conditionally resistant not resistant All data given at room temperature [+2 C] Table 5: Chemical resistance Radiation Resistance lain bearings made of iglidur have limited use under radioactive radiation. They are resistant to radiation up to an intensity of 5 2 Gy. UV Resistance iglidur plain bearings are partially UV resistant. Vacuum In a vacuum environment, existing moisture in iglidur plain bearings is released as a vapour. Use in vacuum can be limited. Electrical roperties iglidur plain bearings are electrically insulating. Volume resistance > 13 Ωcm Surface resistance > 12 ΩΩ igus GmbH Cologne hone +49 () Fax

7 iglidur Technical Data Moisture Absorption The moisture absorption of iglidur plain bearings is approximately.2 % in standard atmosphere. The saturation limit in water is.4 %. This low moisture absorption is well below the values of iglidur G. Maximum moisture absorption At +23 C/5 % r.h..2 % weight Max. moisture absorption.4 % weight Table 6: Moisture absorption Reduction of the inner-ø [%] Moisture absorption [weight %] Installation Tolerances iglidur plain bearings are meant to be oversized before being pressfit. The bearings are designed for pressfit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, the inner diameter is adjusted to meet the specified tolerances. Testing Methods, page 55 Diameter Shaft h9 iglidur Housing H7 d1 [mm] [mm] E [mm] [mm] up to > 3 to > 6 to > to > 18 to > 3 to > 5 to > 8 to > 12 to Table 7: Important tolerances for plain bearings according to ISO after pressfit Graph 11: Effect of moisture absorption on plain bearings 192 Lifetime calculation, CAD files and much more support

8 3 iglidur roduct Range iglidur Sleeve bearing 3.5 Order key d2 d1 SM-34-3 Dimensions according to ISO and special dimensions Chamfer in relation to the d1 d1 [mm]: Ø 1 6 Ø 6 12 Ø 12 3 Ø > 3 f [mm]: f b 1 Length b1 Outer diameter d2 Inner diameter d1 Metric Type (Form S) Material iglidur Dimensions [mm] art number d1 d1-tolerance* d2 b1 h13 SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM art number d1 d1-tolerance* d2 b1 h13 SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM * after pressfit. Testing methods page 55 delivery time available from stock prices price list online order example part number SM-34-3 igus GmbH Cologne hone +49 () Fax

9 iglidur roduct Range Flange bearing Order key FM-45-4 r = max..5 mm Dimensions according to ISO and special dimensions Chamfer in relation to the d1 d1 [mm]: Ø 1 6 Ø 6 12 Ø 12 3 Ø > 3 f [mm]: Length b1 Outer diameter d2 Inner diameter d1 Metric Type (Form F) Material iglidur Dimensions [mm] art number d1 d1-tolerance* d2 d3 b1 b2 d13 h13.14 FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM FM * after pressfit. Testing methods page 55 delivery time available from stock prices price list online order example part number FM Lifetime calculation, CAD files and much more support

10 roduct Range iglidur Flange bearing Dimensions [mm] art number d1 d1-tolerance* d2 d3 b1 b2 d13 h13.14 FM FM FM FM FM FM FM FM FM FM FM FM FM FM * after pressfit. Testing methods page 55 igus GmbH Cologne hone +49 () Fax

11 My Sketches 196 Lifetime calculation, CAD files and much more support