A-32
Engineering Guide CDA3000
Appendix A Formula bank
Coefficients of friction of various material pairings
Lever arm of rolling friction for various material pairings
Density
ρ
of various materials
Friction pairing
Friction type
Coefficient of friction
Steel on steel
Static friction (dry)
Sliding friction (dry)
Static friction (greased)
Sliding friction (greased)
µ
0
=0.12-0.60
µ =0.08-0.50
µ
0
=0.12-0.35
µ =0.04-0.25
Wood on steel
Static friction (dry)
Sliding friction (dry)
µ
0
=0.45-0.75
µ =0.30-0.60
Wood on wood
Static friction (dry)
Sliding friction (dry)
µ
0
=0.40-0.75
µ =0.30-0.50
Plastic belt on steel
Static friction (dry)
Sliding friction (dry)
µ
0
=0.25-0.45
µ =0,25
Steel on plastic
Static friction (dry)
Sliding friction (dry)
µ
0
=0.20-0.45
µ =0.18-0.35
Table 7.21
Coefficients of friction of various material pairings
Material pairing
Lever arm of rolling friction
Steel on steel
f=0.5 mm
Wood on steel (roller conveyor)
f=1,2 mm
Plastic on steel
f=2.0 mm
Hard rubber on steel
f=7.0 mm
Plastic on concrete
f=5.0 mm
Hard rubber on concrete
f=10 mm - 20 mm
Medium-hard rubber on concrete
f=15 mm - 35 mm
Table 7.22
Lever arm of rolling friction for various material pairings
Aluminum
2700
kg/m³
Gray-cast
7600
kg/m³
Copper
8960
kg/m³
Brass
8400-8900
kg/m³
Steel
7860
kg/m³
Zinc
7130
kg/m³
Table 7.23
Density of various materials
Содержание CDA3000
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Страница 315: ...A 24 Engineering Guide CDA3000 Appendix A Formula bank Movement by rack Movement by cable reel Movement by spindle ...
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