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1、1 3Symbols and Units 4ISO Series and SNFA production 5Bearing identification code 6Precision 7Assembly Tolerances 8Form Errors 9Diameter of Abutment Shoulders and Corner Radii of Seatings 11Diameter of Bearing Shoulders and Corner Radii 14Marking 15Lubrication 15Grease 18Oil 21Nozzle Position 23Bear
2、ing handling 24Clamping of bearing rings 25Calculation of the axial clamping force 26Tightening procedure 28Excessive loads 28Overheating 29Brinnelling 29False Brinnelling 30Fatigue 30Reverse Loading 31Contamination 31Lubrication 32Corrosion 32Misalignment 33Excessive Radial Play 33Excessive Ring Fi
3、t 34Electrical Arc Damage 35Natural Frequencies ASSEMBLY MANUAL S U M M A R Y BEARING DAMAGE ANALYSIS 2 ASSEMBLY MANUAL SNFA angular contact, super precision ball bearings are recognised for their high performance capabilities, especially where the demands of precision and speed are at their greates
4、t. SNFA bearings satisfy ISO dimensional requirements (18, 19, 10, 02) as well as AFBMA international regulations (Std. 20), These tolerances are listed in the general SNFA catalogue. The content of this publication shall be viewed as a supplement of, and complimentary to, the data that is contained
5、 in the “SNFA General Catalogue” and it is intended for SNFA bearing users. It provides a useful set of assembly instructions, but does not presume to provide specific instructions as each application has its own particular requirements. 3 Symbols and units of measurement d: Bearing bore diametermm
6、D: External bearing diametermm B: Bearing widthmm : Contact angledegrees dm: Average bearing diametermm C33: Dynamic load capacitydaN Co: Static load capacitydaN Ra: Axial rigiditydaN/m Vh: Maximum speed of a single, spring preloaded, oil lubricated bearing, = 15 (Series BS200 and BS = 62)revs /min
7、Cr: Low speed bearing assembly rolling torquedaN mm M: MassKg n: Rotational speedrpm ndm : Speed factorrpm mm Other symbols appearing within the text are described in the section in which they are found. This table is provided for purely indicative purposes and is not binding as regards the technica
8、l characteristics and performance. Comparison Table of SNFA Bearings with other makes SNFA seriesISOCharacteristics SEA18 Average load capacity Speed up to 1,500,000 ndm (oil) SEB19 Good load capacity Speed up to 1,500,000 ndm (oil) VEB19 Good load capacity Speed in excess of 2,000,000 ndm (oil) Spe
9、ed 2,000,000 ndm, complete with oil lubrication HB19via the outer race and integral O-rings (. / GH) Grease lubrication complete with seals (. / S) EX10 High load capacity Speed up to 1,500,000 ndm (oil) VEX10 Good load capacity Speed in excess of 2,000,000 ndm complete with oil lubrication via the
10、outer race and integral O-rings (. / GH) Speed up to 1,600,000 ndm complete with grease lubrication and seals (. / S) Speed 2,000,000 ndm, complete with oil via the outer race HX10and integral O-rings (. / GH) Grease lubrication complete with seals (. / S) E 20002 High load capacity Speed up to 1,50
11、0,000 ndm (oil) BS 20002 Mainly axial load High rigidity and axial load capacity BS (Special)-As per BS 200 BS 200 ISO 02 ISO 02 B 71900 B 7000 B 7200200 H200 WIS 6200720072007200 BSA 2 7200 76020 ISO 18 ISO 19 ISO 19 ISO 10 ISO 10 SEA SEB B 71800 1900 H9300 WIS 619007900 BNC 19 7900 XS 7900 71900 7
12、1800 71900 CE S71900 B 71900 71800 HS 7190099300 WN 100 H9100 WIS 6000 SH 6000 7000 BNC 10 7000 X-T 7000 7000 7000 CC 7000 CE S 7000 B S 7000 C 7000 HS 700099100 WN HBVEB ISO 19HSS 71900HB/S EX HX - VEX E 200 ISO 10HSS 7000 HX/S VEX/S SNRSKFRHPNSKGMNFAFNIRFAG BARDENSNFASERIES 4 ASSEMBLY MANUAL ISO s
13、eries and SNFA production 6133.5155176196 7143.5175196227 8164196227248 9174206247268 10195226268309 122152462883210 152452873293511 1726530735104012 2032737942124714 2537742947125215 3042747955136216 35477551062147217 40527621268158018 45587681275168519 50657721280169020 557298013901810021 60781085
14、13951811022 65851090131001812023 709010100161102012524 759510105161152013025 8010010110161252214026 8511013120181302215028 9011513125181402416030 9512013130181452417032 10012513140201502418034 10513013145201602619036 11014016150201702820038 12015016165221802821540 13016518180242003323040 14017518190
15、242103325042 15019020210282253527045 16020020220282403829048 17021522230282604231052 18022522250332804632052 19024024260332904634055 20025024280383105136058 22027024300383405640065 24030028320383605644072 26032028360464006548080 28035033380464206550080 DBDBDBDB ISO 18ISO 19ISO 10ISO 02 BORE 10 15017
16、 280 SEBSEAEX VEB HB E 200 BS 200 6 240 8 120 30 120 VEX. 6 120 VEX/S 20 120 HX 30 70 7 140 12 75 E SE VE H BS DIMENSIONAL SERIES STANDARD VARIATIONS CERAMIC BALLS LUBRICATION HOLE THROUGH THE OUTER RACE COMPLETE WITH SEALS LUBRICATION HOLE THROUGH THE OUTER RACE AND O-RINGS/GROOVES /GH /H1 /NS /S /
17、XN ABEC 99 ABEC 5 ABEC 7 5 7 PRECISION SPECIAL POLYAMMIDE 6.6 PHENOLIC RESIN P C BRASSL CAGE MATERIAL EXTERNALE CAGE LOCATION INTERNALI 12 151 0 CONTACT ANGLE 25 18 3 2 6262 7CE1 EX50 DD 2 A X B ISO 02 ISO 10 ISO 19 ISO 18 PRELOAD F M L .daN .m DD TU DU U SET PAIRING TDT TD T FF 3TD L . CHROMEX40RAC
18、EWAYS AND CERAMIC BALLS FORM Universal Triplex Universal Duplex Universal HIGH MEDIUM LIGHT Special preload in daN Axial play in m BORE DIAMETER (mm) STANDARD BEARINGS - FOLLOWED BY: SPECIAL BEARINGSR. BRONZEB SPECIAL MATERIALX /NS/S /G1H1 LUBRICATION HOLE THROUGH THE OUTER RACE AND O-RINGS/GROOVES
19、5 Bearing identification code 6 ASSEMBLY MANUAL Dimensional and functional tolerances for ABEC 5, ABEC 7, ABEC 9 (AFBMA STD 20) bearings Internal ring (Values in microns) N.B.: Bearings with special tolerance limits can be supplied on request. Bearing precision dmp= Deviation of the mean bore diamet
20、er from the nominal(dmp=dmp - d). Dmp= Deviation of the mean outside diameter from the nominal(Dmp= Dmp- D). Kia,Kea = Radial runout of the assembled bearing inner ring and the assembled bearing outer ring respectively. Sia,Sea =Side face runout of the assembled bearing inner ring and the assembled
21、bearing outer ring respectively. Sd =Side face runout with reference to the bore (of the inner race). SD=Taper of the outer race external diameter cylindrical surface relative to the outer ring side face. Nominal dimension 0 10 18 30 50 80 120 150 180 250 315 400 of bore in mm10183050801201501802503
22、15400500 ABEC 5-5-5-6-8-9-10-13-13-15-18-23 dmpABEC 7-4-4-5-6-7-8-10-10-12 ABEC 9-2.5-2.5-2.5-2.5-4-5-7-7-8 ABEC 544455688101315 KiaABEC 72.52.53445668 ABEC 91.51.52.52.52.52.52.555 ABEC 57788891010131520 SiaABEC 7334455778 ABEC 91.51.52.52.52.52.52.555 ABEC 57788891010111315 SdABEC 7334455667 ABEC
23、91.51.51.51.51.52.52.545 ABEC 555556788101315 VBsABEC 72.52.52.5344556 ABEC 91.51.51.51.51.52.52.545 ABEC 5-40-80-120-120-150-200-250-250-300-350-400 BsABEC 7-40-80-120-120-150-200-250-250-300 ABEC 9-40-80-120-120-150-200-250-300-350 ABEC 5-250-250-250-250-250-380-380-380-500-500-630 B1sABEC 7-250-2
24、50-250-250-250-380-380-380-500 ABEC 9 Outer ring (Values in microns) VBs,VCs = Ring width variation: the difference between the largest and Smallest measurements of the inner race width and outer race width measurements respectively. Bs,Cs = Deviation from the nominal value of a single inner race or
25、 a single outer race width (Bs= Bs- B ecc.). B1s,C1s =Deviation the nominal value of a single inner race width or a single outer race width of a set manufactured for paired mounting or a universal bearings(B1s= Bs- B ecc.). Nominal dimension 0 6 18 30 50 80 120 150 180 250 315 400 outerin mm61830508
26、0120150180250315400500 ABEC 5-5-5-6-7-9-10-11-13-15-18-20-23 DmpABEC 7-4-4-5-6-7-8-9-10-11-13-15 ABEC 9-2.5-2.5-4-4-4-5-5-7-8-8-10 ABEC 55567810111315182023 KeaABEC 733455678101113 ABEC 91.51.52.52.54555778 ABEC 588881011131415182023 SeaABEC 755555678101013 ABEC 91.51.52.52.54555778 ABEC 58888891010
27、11131315 SDABEC 7444445557810 ABEC 91.51.51.51.51.52.52.52.5457 ABEC 55555688810111315 VCsABEC 72.52.52.52.53455778 ABEC 91.51.51.51.51.52.52.52.5457 Cs ABEC 5 C1s ABEC 7Values identical to those of the corresponding inner ring of the same bearing ABEC 9 7 Bearing assembly and fitting tolerances are
28、 extremely important for both assembly and bearing operation. The values shown in the following table are a guideline for the design of the shaft, housing and bearing location. Given that precision angular contact ball bearings are widely used in machine tools, the tolerances shown are mainly for th
29、is field of application where the shaft rotates whilst the outer race is stationary. If the application is reversed, i.e. the inner race stationary and the housing/outer race rotating, then the fit between outer race and Nominal shaft61018305080120180250 Diameter in mm50120 50120280 Quantity of oil
30、(l/h)2 . 2415 .12060 . 300 Quantity of oil for lubrication with cooling Oil lubrication Oil injectionentering from external sources and will maintain temperatures at an acceptable level. The assembly should also include oil filtering, a heat exchanger to dissipate heat removed from the bearings and
31、an adequate oil reserve. A suitably sized reservoir facilitates heat dispersion and the settling out of any debris, it also avoids early lubricant ageing. This type of lubrication system requires accurate and proper analysis. Precise rules for calculating oil flow take account of the bearing type an
32、d the assembly. The oil viscosity range for an oil injection system is usually ISO VG10 or VG15. 19 Oil mist lubrication is widely used, especially in high-speed applications as it provides the following advantages: A reasonable level of efficiency, even with a complex bearing arrangement. Low tempe
33、ratures, reduced power absorption. Low cost assembly. Simple construction (channels, spacers, etc.) Good protection for the bearing against outside contamination (pressurised environment). Oil mist lubrication equipment also needs to be designed in accordance with precise standards that take into ac
34、count the design features and speed of the bearings being lubricated. Oil Mist control unit manufacturers can provide the specific data that is needed. The recommended oil viscosity for oil mist lubrication is ISO VG32. A significant characteristic of this system is the use of high viscosity synthet
35、ic oil (generally ISO VG68) that, even in small quantities, ensures the presence of a resistant oil film between the rolling elements and the bearing raceways. This provides both reduced ball rolling resistance and, simultaneously, good bearing behaviour even under high stress. Fig. 5 Oil mist Air /
36、 oil The system is only moderately polluting as it has: A low level of oil consumption, A controlled atomisation effect. Indeed, in this system, the air (the carrier) and the oil are supplied to the bearing via side nozzles (figure 5) or via holes in the external ring of the bearing itself (please r
37、efer to the following page for “H1” and “G1” bearings), without any mixing en route. 20 ASSEMBLY MANUAL CONVENTIONAL H1 G1 Any system capable of sending the quantity of oil to a bearing that is strictly needed in order for it to operate correctly is considered to be “minimum” in nature. This type of
38、 lubrication can also be used in Minimum oil high-speed bearings, by injecting small quantities of oil directly into the bearing itself. A control unit and circuit that guarantees continuity of pressure and flow controls the type and dose of oil used. Notable results have been achieved in the high f
39、requency and high power electro-spindle sector using air / oil lubrication. High speed VEB and VEX bearings with the NS/H1 or NS/G1 designation (ceramic material balls and outer ring with radial lubrication holes), and air / oil lubrication are capable of achieving high rotation speeds in excess of
40、2,500,000 ndm. An approximate calculation of the quantity of oil (Q) that is needed is obtained using the following formula: Q = 1.2 dm mm3/h for each bearing where dm is the bearing mean diameter (in mm). The air / oil flow to the bearings must be homogeneous and without any losses along the way. I
41、t is therefore strongly recommended that each bearing be supplied individually even if, at times, a more complex delivery system is required. “P” and “S” dimensions in mm 6 7 8 9 10 12 15 17 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 120 130 140 150 160 170 180 190 200 220 240 260 2
42、80 13.40 15.40 18.40 20.40 24.50 29.50 34.50 39.50 44.50 50.00 55.60 61.30 66.40 72.40 77.40 82.40 87.40 94.10 99.10 104.10 109.10 114.60 120.90 130.90 144.00 153.20 165.60 0.30 0.30 0.30 0.30 0.35 0.35 0.35 0.35 0.35 0.35 0.45 0.55 0.65 0.65 0.65 0.65 0.65 0.90 0.90 0.90 0.90 1.40 1.10 1.10 2.20 1.
43、85 2.20 12.10 14.80 16.80 19.80 22.00 26.70 31.80 36.80 43.00 48.70 54.20 58.40 64.60 69.60 74.50 81.50 86.50 91.50 98.60 103.50 108.50 115.40 125.40 137.40 149.80 159.80 173.30 183.30 193.30 207.40 217.30 231.10 251.10 271.00 298.90 318.3 0.85 0.75 0.75 1.15 0.90 1.05 1.05 1.00 1.25 1.45 1.45 1.65
44、1.85 1.85 1.75 2.20 2.15 2.15 2.55 2.50 2.50 3.00 2.95 3.40 3.40 3.35 4.65 4.65 4.65 5.65 5.60 6.30 6.30 6.20 7.95 7.30 10.10 11.30 13.30 14.80 16.50 18.20 21.90 24.10 28.70 33.50 39.70 45.70 51.10 56.60 61.60 68.10 73.10 78.10 85.20 90.20 97.00 102.00 109.50 113.60 118.80 126.00 132.80 142.80 157.1
45、0 167.10 178.90 190.80 204.50 219.50 229.00 240.30 264.10 283.60 0.90 1.00 1.20 1.20 0.90 1.20 1.20 1.35 1.50 1.75 1.90 1.90 1.90 2.30 2.30 2.30 2.30 2.30 2.80 2.80 3.00 3.00 3.10 3.10 3.25 4.00 4.25 4.25 5.40 5.40 5.65 5.75 5.50 6.55 6.05 6.20 6.90 6.40 10.10 11.30 13.30 14.80 16.50 18.20 21.90 24.
46、10 28.70 33.80 40.30 46.10 51.60 57.60 62.30 69.60 74.60 79.30 86.50 91.50 98.50 103.50 111.00 115.40 120.40 135.40 144.90 0.90 1.00 1.20 1.20 0.90 1.20 1.20 1.35 1.50 1.65 1.65 1.90 1.85 1.85 2.10 1.90 1.85 2.05 2.15 2.25 2.70 2.70 2.65 3.05 3.05 3.05 3.50 13.10 13.80 16.10 17.90 19.60 22.30 25.70
47、30.80 35.50 42.40 49.90 55.80 60.90 65.20 72.20 80.20 86.00 91.00 95.80 102.70 110.00 116.00 123.80 130.30 137.20 144.40 157.20 168.60 182.50 1.00 0.70 1.30 1.55 1.60 1.45 1.55 1.75 1.65 2.05 2.05 2.50 2.10 2.75 3.15 2.80 3.00 3.00 2.75 3.30 4.00 2.05 3.70 3.75 4.85 4.65 4.85 5.70 5.50 SEA PSPSPSPSP
48、S Diameter d SEB - VEBEXVEXE 200 Nozzle position. Maximum performance is achieved for all oil lubrication systems when the lubricant flow reaches the bearing contact areas with minimum turbulence. Nozzle positioning, as indicated in the table below, is therefore strongly recommended. “P” and “S” val
49、ues for nozzle position SERIES 21 The level of bearing cleanliness affects both bearing life and efficiency. It is therefore extremely important to achieve an application where the bearings operate free of external contamination. 18/13 13/10 10/7 ISO 4406 CONTAMINATION LEVEL Number of particles in 1 cm3 in 100 cm3 Of oil Number of fields Particle dimensions, microns Particle dimension, microns Fig. 6 Influence of the amount of lubricant contamination on bearing behaviour and li