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MachLine ® CH - Hybrid: selecting a ceramic ball The internal design of SNR series can greatly increase bearing performance and life with ceramic balls. Ceramic properties The ceramic used is a Silicone Nitride: Si 3 N 4 • low density: 3.2 kg/dm 3 , • low coefficient of thermal expansion, • high modulus of elasticity: 310.000 N/mm 2 , • non-magnetic, • low coefficient to friction, • electrical insulator, • low heat conductivity, • corrosion-resistant. Significant results These physical properties make it possible to: • increase rotation speed at a given operating temperature, • improve bearing rigidity, • increase bearing life. All MachLine High Precision ranges, ML, MLE and 7000, 71900 and 7200 series are available as a hybrid version. 30
Performance values for MachLine CH - Hybrid Increase in rotation speed: + 30% The kinematics of SNR hybrid bearings generates less slipping and heating than steel ball bearings. At a given temperature, they can operate at approximately 30 % higher speeds than steel ball bearings. Improved rigidity: + 10% The fact that the modulus of elasticity of ceramics is higher than that of steel means that the rigidity of a hybrid bearing can be increased by approximately 10 % under a given preload. In certain situations, the properties of "hybrid" bearings may allow grease lubrication where air-oil lubrication would otherwise be required due to the required rotation speed. This option provides economic advantages. 3 times longer life: x 3 The lubrication and friction behavior of ceramics, in particular, their low friction coefficient and capacity to operate in reduced lubrication conditions, means that bearing raceways resist wear and damage much longer than with steel balls. The actual service life depends on operating conditions, but has been observed to be on the order of 2 or 3 times greater than steel ball bearings (under <strong>com</strong>parable operating conditions). Lubrication: Reduce costs Lubricants used for 100Cr6 steel bearings can generally be used with ceramic ball bearings. Some applications may require a specific study to define the re<strong>com</strong>mended lubricant. Example for a CH7009CVDTJ04, spring preloaded to 550 N Bearing temperature 80 70 60 50 40 30 20 Steel ball Ceramic ball Temperature as a function of rotation speed: At a temperature of 45°C, the rotation speed goes from 10,000 rpm with steel balls to 13,000 rpm with ceramic balls. 10 0 5000 10000 13000 20000 25000 30000 Rotation speed (rpm) 0 31
Page 1 and 2: Industry MachLine ® : the perfect
Page 3 and 4: Contents Everything there is to kno
Page 5: SNR is part of the history of beari
Page 8 and 9: MachLine ® : meeting every challen
Page 10 and 11: MachLine ® : a vast array of solut
Page 12 and 13: MachLine ® : a vast array of solut
Page 14 and 15: Preload: a direct effect on the app
Page 16 and 17: Preload: parameters to take into ac
Page 18 and 19: Influence of an external axial load
Page 20 and 21: Spindle design: simplified calculat
Page 22 and 23: Spindle design: simplified and corr
Page 24 and 25: Spindle design: corrected calculati
Page 26 and 27: Spindle design: simulations Design
Page 28 and 29: Appropriate lubrication: the secret
Page 30 and 31: MachLine ® selection guide Our Mac
Page 34 and 35: MachLine ® ML - High Speed: our so
Page 36 and 37: MachLine ® HNS - N: for extreme co
Page 38 and 39: Spindle types and installation exam
Page 40 and 41: Symbol system for MachLine ® beari
Page 42 and 43: MachLine ® : ranges High Precision
Page 50 and 51: MachLine ® : ranges High Speed and
Page 52 and 53: MachLine ® : ranges High Speed and
Page 54 and 55: Precision self-locking nuts It is h
Page 56 and 57: Precision self-locking nuts Dimensi
Page 58 and 59: Tolerances and precision classes Ri
Page 60 and 61: Tolerances and precision classes Be
Page 62 and 63: Tolerances and precision classes Co
Page 64 and 65: Storage: rules to follow Every SNR
Page 66 and 67: A Installation: rules to follow Lub
Page 68 and 69: Installation: rules to follow Run-i
Page 70 and 71: Expert analysis, training: passing

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