SUPER PRECISION BEARINGS

Transcription

1 SUPER PRECISION BEARINGS

2 Intoduction As technologies evolve, all manufactues shae a global esponsibility to espect and potect the envionment. NSK Motion and Contol poducts eflect ou copoate commitment to envionmental esponsibility. While ou poducts impove the pefomance of machines in a vaiety of industies, they also save enegy and conseve esouces because of ou supeio pecision machining technologies. To meet the needs of the highly specialized machine tool industy, we have enhanced each and evey aspect of ou R&D capabilities at ou Technology Centes. Theefoe, NSK s pecision beaings ae used in a wide vaiety of industies, such as semiconducto poduction and industial obots, and have eaned a eputation fo excellent pefomance. Today, NSK manufactues highly accuate, eliable pecision beaings in Japan and Euope and supplies them all ove the wold. This catalog explains technical mateials including ou latest eseach and expeimental data, vaious applications, the types of pecision beaings available, and the pope utilization of each specific type of NSK s pecision beaing. 1

3 Table of Contents Pat1 Pat 2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Pat1. NSK Supe Pecision Beaings Global Suppot Capabilities Development Capabilities Quality Contol and Poduction Capabilities Pat2. Featues of Pecision Beaings Metallugical Technology to Extend Beaing Life Ceamic Rolling Elements Cages Beaing Components Poduct Range Pefomance of Each Beaing Type Pat3. Selecting the Right Beaing is Citical Beaing Selection Typical High-Speed Main Shaft Spindle Stuctues Othe Spindle Stuctues Featues of Angula Contact Ball Beaings Featues of Cylindical Rolle Beaings P6 P8 P P14 P16 P18 P20 P22 P24 P36 P38 P40 P42 P44 Pat4. Beaing Types 1. Angula Contact Ball Beaings High Pecision Angula Contact Ball Beaings (Standad Seies) P48-60 Featues Numbeing System Beaing Tables Miniatue Seies, BSA Seies fo Ball Scew Suppot 79 Seies 70 Seies 72 Seies Ulta High-Speed Angula Contact Ball Beaings (ROBUST Seies) P62-79 Featues Numbeing System Beaing Tables BNR19, BER19 Seies BNR, BER Seies BNR19XE/XE, BER19XE/XE Seies (Spinshot II) BNR29, BER29 Seies (Wide Seies) BNR20, BER20 Seies (Wide Seies) Ulta High Pecision Angula Contact Ball Beaings (ROBUST Seies BGR) P80-84 Featues Numbeing System Beaing Tables BGR19 Seies BGR Seies BGR02 Seies 2. Cylindical Rolle Beaings Cylindical Rolle Beaings P88-97 Featues Numbeing System Beaing Tables Double-Row Cylindical Rolle Beaings (High Rigidity Seies) 30 Seies 39 Seies 49 Seies Single-Row Cylindical Rolle Beaings (Standad Seies) Seies Ulta High-Speed Single-Row Cylindical Rolle Beaings (ROBUST Seies) Seies Double-Row Cylindical Rolle Beaings (Low Heat Geneation Seies) 30 Seies Ulta High-Speed Single-Row Cylindical Rolle Beaings (Low Heat Geneation Seies) Seies 5. Pecision Deep Goove Ball Beaings Pecision Deep Goove Ball Beaings P Featues Numbeing System Beaing Tables T1X Type (Polyamide esin cage) 60, 62 and 63 Seies 6. Peipheal Equipment Gauges P GR Gauges Featues Numbeing System GTR Gauges Featues Numbeing System GN Gauges Featues Numbeing System Beaing Monito P128 Beaing Heate P129 Gease Replenishing System P Oil-Ai Lubicato P Sealed Pecision Spaces fo Machine Tool Spindles P Pat5. Technical Guide 1. Life P Rolling Fatigue Life and Basic Load Rating New Life Theoy 2. Static Load Ratings and Static Equivalent Loads P Angula Contact Ball Beaing Combinations P Featues of Each Combination Univesal Combination 4. Peload and Rigidity P Types of Peload and Rigidity Peload and Rigidity Tables 5. Limiting Speeds P Lubication P Pat6. Beaing Handling 1. Mounting P Cleaning the Beaings and Related Pats 2. Checking Dimensions of Related Pats 3. Mounting Pocedues 4. Inspection afte Mounting 2. Opeational Inspection P Initial Running-in Pocedues P Pat7. Beaing Failue Diagnosis 1. Beaing Failue and Countemeasue P Diagnosis with Sound and Vibation P Pat8. Appendices Toleances fo Shaft Diametes P Toleances fo Housing Boe Diametes P Values of Standad Toleances fo IT Gades P Hadness Convesion Table P234 Physical and Mechanical Popeties of Mateial P Request fo Specification Investigation P237 Old and New Numbe Contast Table P238 Method fo Measuing Axial Cleaance of Combined Angula Contact Ball Beaings P Angula Contact Thust Ball Beaings Angula Contact Thust Ball Beaings P0-5 Featues Numbeing System Beaing Tables High-Speed Angula Contact Thust Ball Beaings (ROBUST Seies) BAR Seies BTR Seies Double-Diection Angula Contact Thust Ball Beaings (TAC Seies) TAC29D Seies TAC20D Seies 4. Ball Scew Suppot Beaings Angula Contact Thust Ball Beaings fo Ball Scew Suppot P8-113 Featues Numbeing System Beaing Tables Machine Tool Applications TAC B Seies Electic Injection Molding Machine Applications TAC02 and 03 Seies Units fo Ball Scew Suppot P Featues Numbeing System Beaing Tables 7. Beaing Toleances P Toleance fo Radial Beaings Toleances fo Tapeed Boes Toleances fo Angula Contact Thust Ball Beaings 8. Designing of Shafts and Housings P Fitting of Shafts and Housings Shafts and Housing Toleance Shoulde and Fillet Dimensions Chamfe Dimensions 9. Spaces P Space Dimensions Position of Spay Nozzle 2 3

4 SUPER PRECISION BEARINGS Pat1 Contents Pat1. NSK Supe Pecision Beaings Global Suppot Capabilities P6 Development Capabilities P8 Quality Contol and Poduction Capabilities P 4 5

5 Global Suppot Capabilities Pat1 Pat 2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Unifom suppot system anywhee in the wold NSK is committed to manufactuing and selling poducts with consistently high quality anywhee in the wold unde the leadeship of Technology Centes in the fou majo global makets. NSK s sales offices, with expet staff that constantly exploe custome needs, pomote global netwok management that encompasses Technology Centes as well as poduction sites. NSK can espond quickly and effectively to the vaious needs of customes and suppots thei business development effots in any egion. China Technology Cente Euope Asia Japan 77 4 Head Office Building NSK Fujisawa Plant The Ameicas Fujisawa Technology Cente Headquates Newak Plant Euope Technology Cente Asia Pacific Technology Cente Ameican Technology Cente Sales office, Plant Technical office Global netwok management povides optimal, high-quality poducts Technology Cente custome suppot Custom poducts fo unique custome applications Ou global suppot netwok is available wheeve ou customes ae located NSK has established a highly-developed infomation netwok centeed on Technology Centes located in the fou majo makets of the wold Euope, the United States, Asia and Japan. With this netwok, we ae able to gathe infomation, in eal time, elated to the changes and tends in any maket in the wold. As a esult, we can eact quickly to meet changing custome needs to supply optimal, high-quality poducts. Infomation system diectly linked to customes Technology Centes in fou majo makets povide technical suppot to customes in thei espective egions. This suppot enables ou customes to use NSK s poducts unde ideal conditions and achieve the best possible pefomance. Each Technology Cente woks closely with ou customes to detemine thei pecise application needs. In doing so, we assist them in identifying the ight NSK poduct fo each application to ealize maximum efficiency and cost effectiveness. Upon equest, we can also supply completely customized poducts to satisfy highly-specialized custome needs. Ou extensive global netwok is able to eceive odes and supply poducts anywhee in the wold. NSK s distibutos cove the globe and maintain an inventoy of all citical poducts in evey majo maket and location, making it possible to supply poducts to customes without delay. NSK also povides technical suppot woldwide to help customes detemine the best beaing fo each application, espond quickly to any questions, and immediately addess any poblems ou customes may encounte

6 Development Capabilities Pat1 Pat 2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 NSK s key technology NSK s key technology is Tibology, the science of fiction and wea. Tibology is a technology that focuses on saving enegy and conseving esouces by educing fiction and wea as well as peventing machine failue and theeby inceasing eliability. NSK pomotes the development of new poducts with a focus on fou coe technologies deived fom Tibology. Analysis Technology NSK developed its own softwae, BRAIN (Beaing Analysis In NSK), which enables digital simulations of fiction-elated movement and pefomance by applying Tibology. The combined use of this simulation data with an effective facto method (EFM) ealizes advanced compute-aided engineeing (CAE). Lubication Technology Though the elentless application of Tibology, NSK s key technology, NSK has pusued lubication technologies that allow machines to delive maximum pefomance and NSK s accomplishments in these effots contibute to saving enegy and esouces, theeby conseving the global envionment. Evaluation Technology NSK has established an evaluation technology that spans a wide ange of applications by employing advanced technologies such as nano-ode unout measuement using ulta high-pecision measuing instuments. Ou evaluation technology contibutes to the development of cutting-edge poducts that coespond with inceasingly sophisticated maket needs. Mateial Technology Reseach and development acoss a wide ange of mateial technologies has been conducted to poduce eve-highe pefoming poducts. Poducts made of NSK s popietay mateials delive long life unde hash conditions, ae maintenance-fee, and also suppot all industies. 8 9

7 Quality Contol and Poduction Capabilities Pat1 Pat 2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 The highest level of quality in the wold NSK pecision beaings delive the highest level of accuacy, suppoted by ou poduction capability, state-of-the-at equipment and extensive manufactuing expetise, as well as ou commitment to applying the same igoous quality contol pocedues at each stage of the poduction pocess in evey NSK facility. NSK focuses its effots at its global poduction sites in Japan and England on offeing poducts with high accuacy to quickly meet the divese needs of customes woldwide. 1 Heat teatment 2 Ginding 3 Component inspection 4 5 Finished Assembly goods inspection 6 Packaging Manufactuing technologies to poduce high accuacy poducts To maintain ou eputation fo manufactuing pecision beaings with the highest degee of accuacy in the wold, all pecision beaings ae checked to nanomete accuacy. Global poduction in England and Japan NSK s pecision beaings ae made in both England and Japan. The combined expetise and locations of these manufactuing facilities allow us to meet evey custome need. NSK Newak Plant NSK Fujisawa Plant NSK symbol NSK s golden box guaantees the highest level of accuacy. Complete quality contol and envionmental esponsibility As membes of an ISO 9001-cetified entepise, all NSK plants adhee to stict intenational standads fo quality contol. NSK is also making an all-out, companywide effot to addess envionmental concens as a top pioity. ISO 9001 Cetification ISO Cetification 11

8 High Pefomance in the Next Geneation Pat2 NSK continually challenges the status quo to exploe new possibilities. As ou design philosophy does not allow us to compomise quality in manufactuing, we ae diven to develop total solution technologies. By using the latest mateial and analysis technologies we ae able to design and manufactue exceptional, high pefomance pecision beaings. NSK will always stive to achieve the quality and pefomance that will be equied in next geneation beaings. Contents Pat2. Featues of Pecision Beaings Metallugical Technologies to Extend Beaing Life P14 Ceamic Rolling Elements P16 Cages P18 Beaing Components Poduct Range Pefomance of Each Beaing Type P20 P22 P

9 Metallugical Technologies to Extend Beaing Life Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Thee types of steel mateials suppot the long life and high pefomance of NSK supe-pecision beaings NSK has established goundbeaking evaluation techniques fo inclusions in steel and steel-making pocedues. These technologies make it possible to develop mateials fo long-life, high-pefomance olling beaings. Thee types of steel mateials SHX steel that withstands ulta high-speed otation envionments, EP steel that exhibits high eliability unde heavy load envionments, and Z steel that achieves extended opeation life unde geneal conditions suppot NSK supe-pecision beaings. Z Steel as a Standad Mateial fo Supe-Pecision Beaings Z Steel Life, L Cycle Standad Long Life Mateial 1.8 Times Longe Fatigue Life than Conventional Vacuum Degassed Steel It is well known that the olling fatigue life of high cabon chome beaing steel (SAE520, SUJ2) used fo olling beaings is significantly affected by non-metallic inclusions. Life tests show that oxide non-metallic inclusions exet a paticulaly advese affect on olling fatigue life. Z Steel, with lowe oxide non-metallic inclusions, exhibits impoved pefomance. Featues of Z Steel Z Steel is poduced by educing non-metallic inclusions, oxides and othe inclusions such as Ti, o S, inside the steel. Beaings made of this steel delive significantly extended sevice life, up to 1.8 times longe, compaed to conventional vacuum degassed steel. Oxygen Content in Steel and Opeating Life Z Steel Vacuum degassed steel fo the beaings in a wide vaiety of industies Oxygen Content in Steel, ppm EP Steel fo Highe Reliability unde Heavy Load Envionments EP Steel Numbe of Paticles Exta Long Life and High Reliability 3 Times Longe Fatigue Life than SUJ2 Steel Development of innovative techniques fo evaluating oxide nonmetallic inclusions and the establishment of steel-making pocedues esulted in EP steel that achieved a damatic advance in beaing eliability. Featues of EP Steel Beaings made fom EP Steel exhibit inceased eliability due to minimal vaiation in life esulting fom the new evaluation technique and significantly educed impuities. The establishment of a new evaluation technique NSK established the NSK-ISD2 Method, an image analysis system and a special steel-making pocedue, to impove the evaluation of oxide non-metallic inclusions. Impovement of steel-making pocedues The intoduction of this technique into steel manufactuing technology significantly impoved puity and educed nonmetallic inclusions compaed to Z Steel. EP Steel contains fewe lage paticles than eithe Vacuum Ac Remelted (VAR) o conventionally efined Z Steel. Puity compaison though image analysis EP Steel 5 15 Oxide Paticle Size, μm SUJ2 EP 3 μm 40C. >5 μm 5C. > μm 0C. [O] : (5.5)ppm View Numbe of Paticles Cumulative failue pobability, % Z Steel 5 15 Oxide Paticle Size, μm Test conditions (Beaing: 6206) P/C: 0.71 Speed: min 1 Lubication: Foced ciculation lubication SUJ2 Z 3 μm 404C. >5 μm 0C. > μm 8C. [O] : (8)ppm View Fatigue Life Subsuface oiginated flaking test EP Steel Z Steel SHX Steel Endues Ulta Speed Rotation Envionments SHX Steel Wea Resistance Amount of wea, g Time until seizue, sec Cumulative failue pobability, % Wea esistance of each mateial (2 cylindical olles wea test) 0 0 SHX SUJ2 M50 Seizue Resistance Fatigue Life SHX SUJ Sliding distance, m Dy seizue limit test (4 balls test) SHX Mateial Clean lubication Test conditions (Beaing: 6206) 5 P/C: 0.71 Tempeatue: 160 C Speed: min 1 Oil film paamete ( ): Life, h M50 Subsuface oiginated flaking test Poducts made of Z Steel Poducts made of EP steel Poducts made of SHX Steel Heat Resistant Steel Extends the Life of Beaings Used in Ulta High-Speed Applications 4 Times Longe Fatigue Life than SUJ2 Steel, at 20% Highe Speed SHX is a heat-esistant steel esulting fom NSK s special heat teatment technology. Featues of SHX Steel SHX steel exhibits simila heat esistant pefomance to M50 steel, which is used fo beaings on the main shaft of jet engine applications whee tempeatues each 300 C, and featues lowe fiction pefomance, while at the same time exceeding M50 steel in wea and seizue esistance and fatigue life. This level of heat esistance, lowe fiction pefomance and indentation esistance epesent ideally suited steel chaacteistics fo ulta high-speed machine tool beaings. Patent Numbe: JP PV value, kgf/mm 2 m/s Cumulative failue pobability, % Load cylindical olles wea test Lubicant 7 min 1 min 1 SUJ2 SHX SUJ2 M50 Test conditions Suface pessue : 880 MPa Sliding atio : 30% Lubication : Spindle oil (2 cc/min) Tempeatue : Room tempeatue Oil bath seizue limit test (4 balls test) M50 Mateial Contaminated lubication Test conditions (Beaing: 6206) P/C: 0.28 Tempeatue: 140 C Speed: min 5 1 Foeign debis Hadness: Hv540 Size: μm Life, h SHX Suface oiginated flaking test 4 balls test Load Rotating Fixed NSK uses Z Steel as a standad mateial Ball Scew Suppot Beaings Ulta High-Speed ROBUST Seies fo Ulta High-Speed Machine Tool Main Spindles 14 15

10 Ceamic Rolling Elements Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Less heat is geneated, making possible ulta high-speed otation. Ceamic hybid beaings have many excellent pefomance chaacteistics such as heat esistance, extended life, light weight, lowe themal expansion, electically non-conductive, and thus can be used in an infinite numbe of applications as a new geneation mateial. Ealy on NSK s knowledge of mateials and beaing manufactuing led us to utilize one ceamic in paticula, silicon nitide (Si 3 N 4 ), fo the olling elements in ceamic hybid beaings. Hybid beaings with ceamic elements have eaned a good eputation in the field fo ulta high speed combined with ulta high accuacy, a pefomance combination that is not achievable in beaings with steel olling elements. Seizue Resistance Relative to steel balls, ceamic balls have a highe seizue esistance. Oute ing tempeatue ise, C 0 Steel balls Seizue Ceamic balls Oil Inteuption Test Result, s Resupply 30 Cutting by NSK Spindle using Ceamic Ball Beaing End Mill: 16 Wok Mateial: A5052 Rotational speed: min cm 3 /min High speed and low-heat geneation Light weight As the density is 40% lowe than that of steel, the centifugal foce applied to the olling elements is smalle, thus extending beaing life. Low coefficient of linea expansion In applications involving high speed opeation, although the tempeatue of the beaing is high, this low coefficient esults in lowe peload and lowe heat geneation. Low fiction The slip of the olling element duing opeation is educed, and this means less heat is geneated. Calculated esult of heat geneation Less heat is geneated, making possible ulta highspeed otation. High Rigidity Ceamic balls have a Young s Modulus that is 50% highe than that of steel, making it an ideal mateial fo use in machine tool spindles equiing igid cutting pefomance. Cutting by NSK Spindle using Ceamic Ball Beaing Axial displacement, μm BNRS (Steel balls) 65BNRH (Ceamic balls) 65BARS (Steel balls) 65BARH (Ceamic balls) 65BTRS (Steel balls) 65BTRH (Ceamic balls) Axial load, N Face Mill: 80 Wok Mateial: S50C Rotational speed: min cm 3 /min Dynamic fictional loss, w Rolling fiction between balls and aceways Spin Slip Gyoscopic Slip Othes Dynamic fictional loss, w Rolling fiction between balls and aceways Spin Slip Othes Gyoscopic Slip High Accuacy NSK s expetise in the manufactuing of balls and olles ove the yeas along with impovements in the sinteing pocess and the gade of mateials used enables NSK to poduce ceamic balls and cylindical olles that featue a highe level of accuacy 98 than steel mateials. Beaings using these high-accuacy ceamic olling elements suppot high-accuacy machining Speed, min Speed, min The Oute Ring Tempeatue Rise in High Speed Opeation Oute ing tempeatue ise, C Steel balls Ceamic balls NSK Spindle that achieved 4 million d m n using ceamic ball beaings Size: 9/32'' Magnification: times Roundness of ceamics ball Ceamic ball beaing 278 Roundness of mateial being gound 0.14 µm 1 µm/div High magnification ( times) Spheicity measuing equipment Speed, min 1 Ceamic olle beaing Ceamic ball beaing

11 Cages Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Engineeed polyme cages with highe speed capability and lowe fiction Because of light weight (polyme density is 1/6 that of bass), easy fomability, and high coosion esistance, polyme mateials ae used widely in beaing cages. Polymes can be engineeed to have lowe fiction and thus lowe heat geneation and highe speed capability. Polymes can be engineeed fo low wea, thus extending gease life. The engineeed polyme cage is well suited fo beaings used in machine tool main spindles. Cage fo Angula Contact Ball Beaings Ball Guided Polyamide Cage (TYN) Low Noise Oute Ring Guided Phenolic Cage Rolle Guided Machine Bass Cage Rolle Guided PPS Cage Oute Ring Guided PEEK Cage Ball Guided Polyamide Cage This special design allows the beaing to have lowe fiction and lowe noise. This cage is effective with gease lubication. The intenal fee space of the beaing in this cage is lage than that with oute ing guided cage so, it is possible to keep moe gease inside of the beaing. The peiod of the gease unning-in pocedue fo a beaing with this cage is shote than that of a beaing, with a phenolic cage. Cage fo Double-Row Cylindical Rolle Beaings Rolle Guided PPS Cage (TB) Engineeed Polyme High Rigidity Optimal olle-guided cage design with consideation fo stength and fiction. Excellent physical popeties include highe stength, toughness, wea and fatigue esistance compaed to cuent polyamide cage mateial. High tempeatue esistance up to a maximum of 220 C. Ulta High-Speed Angula Contact Ball Beaings ROBUST Seies Cage Pefomance Test Result Oute ing tempeatue ise, C T cage TYN cage Beaing: 65BNRH-DB Peload afte mounted: Position peload 300N Lubication: Gease The tempeatue ise of the beaing with a TYN cage is lowe than that with a Phenolic cage at a otational speed lowe than 1.4 million d mn Cage fo Single-Row Cylindical Rolle Beaings Oute Ring Guided PEEK Cage (TP) Engineeed Polyme Double ow CRB High Rigidity Seies Ulta High-Speed 0 Speed min 1 4 d m n Minimizing cage defomation to pemit stable high-speed otation. High tempeatue esistance up to a maximum of 240 C. Excellent wea-esistant pefomance and suited to minimal oil lubication. Physical popeties include high stength, toughness, wea and fatigue esistance. Oute Ring Guided Phenolic Cage (T, TR) Ulta High-Speed The otational movement of the oute ing guided cage is moe stable in high-speed opeation. Standad Seies Angula Contact Ball Beaings Standad Seies Ulta High-Speed Angula Contact Ball Beaings ROBUST Seies Rolle Guided Machined Bass Cage (MB, MR) This cage demonstates high tempeatue esistance, high stength, and high igidity. Ulta High-Speed Single Row CRB Robust Seies Geneal Pupose 18 19

12 Beaing Components Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 NSK supe-pecision beaings with optimal mateials and intenal design Angula Contact Ball Beaings (Standad Seies) Cylindical Rolle Beaings Cages Rolling elements Ceamics SUJ2 Cage Polyamide Phenolic Rolling elements SUJ2 Rings SUJ2 NN30 PPS Bass Type Rings Rolling elements Cages Rings SUJ2 Standad SUJ2 SUJ2 PPS(TB)/ Bass (MB) Cage Angula Contact Ball Beaings (ROBUST Seies) Type Rings Rolling elements Cage SUJ2 type SUJ2 SUJ2 Polyamide 46 (TYN) Ceamic ball type SUJ2 Ceamics Phenolic (TR) Rolling elements Ceamics SHX SUJ2 Rings SHX SUJ2 N PEEK Bass Type Rings Rolling elements Cage Standad RS SUJ2 SUJ2 SUJ2 SUJ2 Bass (MR) RX SHX SHX PEEK(TP) RXH SHX Ceamics Rolling elements Ceamics SUJ2 Cage Polyamide Phenolic PEEK Angula Contact Thust Ball Beaings fo Ball Scew Suppot Rings SHX SUJ2 Rolling elements SUJ2 Cage Polyamide Bass Type Rings Rolling elements Cage S H X SUJ2 SUJ2 SHX SUJ2 Ceamics Ceamics Polyamide 46 (TYN) Phenolic (T) PEEK (T42) Rings SUJ2EP SUJ2 Type Rings Rolling elements Cage Fo machine tool applications Fo injection molding applications SUJ2EP SUJ2 SUJ2 SUJ2 Polyamide 66 Polyamide 46/ Bass 20 21

13 Supe Pecision Beaings Poduct Range Seveal types of supe pecision beaings ae available fom NSK, including the ROBUST seies of high pefomance beaings, the special seies of beaings fo unique and specialized applications, and the standad seies beaings. High Pecision Angula Contact Ball Beaings Standad Seies Basic NSK supe pecision beaings manufactued to confom to ISO standad. Standad Seies 70xx, 72xx, 79xx seies Thee types of contact angle: 15 (C), 25 (A5), 30 (A) Two types of cage design: Select eithe phenolic (TR) o polyamide (TYN), depending on application equiements Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Ulta High-Speed Single Row Cylindical Rolle Beaings ROBUST Seies Standad Seies High pefomance cylindical beaings designed fo ulta high-speed applications, such as machining cente spindles. Two types of cage mateial: Bass (MR) (1) and PEEK esin (TP) Thee types of olle mateial: Steel, SHX and Ceamic Ulta high-speed ROBUST RXH design can be used up to 2.2 million d m n (1) MR cage is used in the standad seies ROBUST seies is the high pefomance seies of NSK supe pecision beaings. ROBUST Seies Standad Seies Ulta High-Speed Angula Contact Ball Beaings ROBUST Seies Double Row Cylindical Rolle Beaings Standad Seies ROBUST Seies (BNR, BER) High pefomance beaings developed fo high-speed opeation with low tempeatue ise. Suitable fo ulta high pecision machining applications, and ulta high-speed applications. Two types of contact angle: 18 (BNR), 25 (BER) Two types of ball mateial: steel (S type) and Ceamic (H and X type) Two types of cage design: Select eithe phenolic (T) o polyamide (TYN), depending on application equiements ROBUST seies also can be used fo ulta high-speed applications of ove 3 million d m n High Rigidity Seies Designed to delive high igidity in high-speed applications such as lathe spindles. Two types of cage mateial: Bass (MB), PPS esin (TB) Standad specification E44: Oute ing oil holes and goove Sealed Angula Contact Ball Beaings Special Seies Angula Contact Thust Ball Beaings fo Ball Scew Suppot Special Seies Special Seies Pegeased and sealed to educe handling poblems. Suitable fo maintenance of machine tool spindles. Standad seies supe pecision angula contact ball beaings ROBUST seies high-speed angula contact ball beaings Boe size ange: 30 0 mm in ISO seies and 19 (70xx and 79xx) fo Machine Tool Applications High igidity thust beaings designed specifically fo ball scew suppot applications in machine tools. Contact angle: 60 Can be univesally matched to any equied igidity specification o life cycle A pegeased line using special gease is also available A new seies is available, supplied with contact seals and watepoof gease High-Speed Angula Contact Thust Ball Beaings ROBUST Seies Angula Contact Thust Ball Beaings fo Ball Scew Suppot Special Seies ROBUST Seies (BAR, BTR) High igidity thust beaings fo lathe applications. Two types of contact angle: 30 (BAR), 40 (BTR) Two types of ball mateial: steel (S type) and Ceamic (H type) fo Injection Molding Machines The high load capacity design delives five times the life expectancy compaed to ball scew suppot beaings fo machine tool applications of a simila size. The numbe of ows can also be educed. Easie handling than tapeed olle beaings o thust spheical olle beaings as a esult of non sepaable configuation Optimum ball beaing design esults in lowe otational toque Can be univesally matched to any equied igidity specification o life cycle Ulta High Pecision Angula Contact Ball Beaings ROBUST Seies High Pecision Deep-Goove Ball Beaings Special Seies ROBUST Seies (BGR) High Pefomance beaings developed specifically fo intenal ginding o high-speed moto applications unde sping peload. Boe size ange: 6 25 mm, contact angle: 15 Two types of ball mateial: steel (S type) and Ceamic (H and X type) Non sepaable type Univesal combinations (DU and SU) Special Seies Suitable fo high-speed and high pecision motos. Two types of cage: Ball guided polyamide cage (T1X,TYA) Fo quiet opeation, with low vibation 22 23

14 ROBUST Seies Ulta High-Speed Angula Contact Ball Beaings Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Designed to achieve high-speed opeation combined with low heat geneation ROBUST Seies High pefomance Benefits Low Heat Geneation High Seizue Resistance Bette Tempeatue Stability Robustness Stable duing High-Speed Opeation Featues of XE seies High-Speed Pefomance (in Position Peload) High-speed pefomance in position peload to a maximum of 2.5 million d m n with jacket cooling (Max. 2.7 million d m n without jacket cooling). Silent Opeation Silent opeation 3-5 db quiete than conventional oil-ai lubication. Oientation Remains stable in eithe vetical o hoizontal spindle oientation. Reduced Ai Consumption Ai consumption can be 1/3 elative to conventional oil-ai lubication. XE Type Suitable fo silent opeation due to educed ai-noise achieved though oil-ai lubication design Mateial of Inne/Oute Rings: Heat Resistant Steel SHX Ceamic Balls Cage selection based on speed equiements Oute Ring Guided Phenolic Cage: up to 2.5 million d m n Oute Ring Guided PEEK Cage: ove 2.5 million d m n ROBUST Seies X Type High pefomance beaings demonstating high wea and seizue esistance duing ulta high-speed opeation Analysis Data Sophisticated analysis softwae takes into account the slip inside the beaing and simulates tempeatue ise to establish optimum design specifications. By educing the heat geneated, ROBUST seies beaings emain much moe stable duing high-speed opeation than cuent seies beaings. Heat geneation, W Heat Geneation with Gease Lubication Analytical Value ( 65 mm) Standad beaings ROBUST Seies Speed (min 1 3 ) Tempeatue ise of oute ing, C Oute Ring Tempeatue Rise with Gease Lubication Test Result ( 65 mm) Speed Standad beaings ROBUST Seies (min 1 3 ) Mateial of Inne/Oute Rings: Heat Resistant Steel SHX Ceamic Balls Oute Ring Guided Phenolic Cage Test Data ROBUST Seies H Type High pefomance beaings that combine high-speed opeation with low heat geneation Mateial of Inne/Oute Rings: Steel Ceamic Balls Cage selection based on speed equiements Ball Guided Polyamide Cage: up to 1.4 million d m n Oute Ring Guided Phenolic Cage: ove 1.4 million d m n Oute ing tempeatue ise, C Tempeatue Data with Gease Lubication X type H type S type Beaing: 65BNR-DBB Peload afte mounted: 300 N Lubication: MTE Gease Speed min 1 6 d mn Oute ing tempeatue ise, C Tempeatue Data of With cooled housing Without cooled housing Beaing: 65BNRXETDB Peload afte mounted: 200 N Lubication: VG32, 0.03 cc/8 min, 2 nozzles Speed min 1 6 d mn ROBUST Seies S Type Steel ball beaings fo optimal cost Mateial of Inne/Oute Rings: Steel Steel Balls Ball Guided Polyamide Cage High speed Oute ing tempeatue ise, C Tempeatue Data with Oil-Ai Lubication X type H type Beaing: 70BNR-TDB Peload afte mounted: 150 N Lubication: VG22, 0.03 cc/8 min, 2 nozzles With cooled housing Speed min 1 6 d mn Noise, db XE type X type Noise Compaison Speed min 1 6 d mn

15 ROBUST Seies Standad Seies High Pefomance Cylindical Rolle Beaings Pat 1 Pat2 Pat 3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Designed to achieve high speed pe fomance combined with high igidity 1 Low Heat Geneation Featues of High Rigidity Double Row Cylindical Rolle Beaings Longe Beaing Life Benefits 2 Impoved Seizue Resistance The PPS (engineeed polyme) cage is heat esistant and povides high igidity. As compaed to a bass cage, this cage eliminates any wea paticles, allowing an extended gease life. 3 Stable Opeation in Ulta High Speed Limiting Speed Tempeatue Rise with Gease Lubication High pefomance Ulta High-Speed Single Row Cylindical Rolle Beaings ROBUST Seies RXH Type Highest pefomance fo optimum seizue esistance duing ulta high-speed opeation Mateial of Inne/Oute Rings: Heat Resistant Steel SHX Ceamic Rolles Oute Ring Guided PEEK Cage Limiting Speed, min Rings & olles: Steel Gease Lubication 0.85 million Boe, mm Oute ing tempeatue ise, C Beaing with new plastic cage (PPS) Beaing with cuent plastic cage (Polyamide) Beaing: NN3019 Lubication: gease Cleaance afte mounted: 0 μm Speed min 1 6 d mn Double Row Cylindical Rolle Beaings High Rigidity Seies High pefomance seies with a newly developed polyme cage Mateial of Inne/Oute Rings: Steel Rolle Guided PPS Cage o Rolle Guided Bass Cage (Selection based on application equiements) Ulta High-Speed Single Row Cylindical Rolle Beaings ROBUST Seies RX Type High pefomance with wea and seizue esistance duing ulta high speed opeation Mateial of Inne/Oute Rings: Heat Resistant Steel SHX SHX Rolles Oute Ring Guided PEEK Cage Featues of the ROBUST seies Ulta High-Speed Single Row Cylindical Rolle Beaings Low Heat Geneation Intenal design and advanced cage mateial esult in low heat geneation. Seizue Resistance RX and RXH types ae made with SHX steel esulting in impoved seizue esistance. High Speed Capability RS, RX and RXH types have cages made of heat esistant PEEK mateial fo ulta high speed opeation (ove 2.0 million d m n). Single Row Cylindical Rolle Beaings Standad Seies Standad type beaing with bass cage Mateial of Inne/Oute Rings: Steel Rolle Guided Bass Cage Ulta High-Speed Single Row Cylindical Rolle Beaings ROBUST Seies RS Type Designed to delive cost effective high-speed pefomance Mateial of Inne/Oute Rings: Steel Steel Rolles Oute Ring Guided PEEK Cage High speed Limiting speed, min Oil-ai lubication RS type: 1.4 million Limiting Speed RXH type: 2.2 million Boe, mm Oute ing tempeatue ise, C Tempeatue Rise with Oil-Ai Lubication Test conditions Beaing: N14RXHTP Lubication: oil-ai (VG22) Cleaance afte mounted: 0 μm Speed min 1 6 d mn 26 27

16 ROBUST Seies High-Speed Angula Contact Thust Ball Beaings ROBUST Seies Ulta High Pecision Angula Contact Ball Beaings High pefomance beaings that combine high-speed capability with high igidity ROBUST Seies Ulta high-speed intenal ginding spindle beaings fo high accuacy and longe life ROBUST Seies (BGR) 1 High-Speed Capability 1 Optimum Intenal Design Benefits 2 Low Heat Geneation Benefits 2 Easy Handling Due to Non Sepaable Featue 3 High Accuacy 3 Fee Choice of Aangement with Univesal Combination High-Speed Angula Contact Thust Ball Beaings BTR Seies 40 contact angle and high axial igidity and low heat geneation. Intechangeable with TAC seies. High-Speed Angula Contact Thust Ball Beaings BAR Seies 30 contact angle delives highe speed capability. Intechangeable with BTR and TAC seies. Double Row Angula Contact Thust Ball Beaings TAC Seies 60 contact angle with the highest axial igidity. Featues of Angula Contact Thust Ball Beaings Featues of the BGR Seies High Accuacy Due to the high degee of accuacy, they ae paticulaly suited fo lathe spindle applications. Themocouple 0BARSTYN 0BTRSTYN Themocouple Optimum Design Optimum oute ing guided cage design fo bette lubication. Inne ing shoulde elieved to enable a stable supply of oil into the beaing. Intechangeable To adjust spindle stiffness chaacteistics, BTR and BAR seies can be intechanged with TAC seies, with minimal modification of the spindle. (See figue on the ight). Data with Gease Lubication 0TAC20X NN3020KR Test machine stuctue NN3017KR Axial Load and Axial Displacement Longe Life Heat esistant SHX steel fo longe life. Easy Handling Non sepaable stuctue makes handling easy. Ulta High Accuacy ISO class 2 (ABMA ABEC9) is the standad. Oute ing tempeatue ise, C TAC20X (α 0 =60 ) 0BTRSTYNDB (α 0 =40 ) 0BARSTYNDB (α0=30 ) Gease lubication (Isoflex NBU15) Speed min 1 4 d m n Axial displacement, μ m BARSTYNDB (α 0=30 ) 0BTRSTYNDB (α 0 =40 ) 0TAC20X (α 0 =60 ) Axial load, N Univesal Combination Beaings can be configued in the usual aangements of DB/DF/DT, as well as a vaiety of othe aangements. Oil supply

17 Special Seies Ball Scew Suppot Angula Contact Thust Ball Beaings Special Seies Ball Scew Suppot Angula Contact Thust Ball Beaings (fo Machine Tool Applications) (fo Injection Molding Machines) High pefomance special beaings with high igidity TAC B Seies These special high pefomance beaings can simplify machine design and educe costs TAC 02, 03 Seies 1 Longe Life 1 Space Saving, High Load Capacity Benefits 2 3 Lowe Toque Easy Handling Benefits 2 3 High Reliability Easy Handling 4 High Accuacy 4 Reduced Toque fom Optimized Design Featues of Ball Scew Suppot Beaings fo Machine Tools Featues of Ball Scew Suppot Beaings fo Injection Molding Machines Longe Life Components made fom longe life EP extemely puified steel. High Rigidity Special intenal design (60 contact angle and moe balls) fo highe axial igidity. Lowe Toque Lowe stating toque than eithe tapeed o cylindical olle beaings means high otation accuacy even at low diven powe. Univesal Combination Beaings can be configued in the usual aangements of DB/DF/DT, as well as a vaiety of othe aangements. A pegeased option is also available (with Alvania No.2 gease). Easy Handling and Inceased Reliability New seies with contact seals and watepoof gease has highe eliability and easie handling. Single univesal combination (SU) is the standad fo this seies. High Running Accuacy New polyamide cage fo high unning accuacy. High Reliability High load capacity design delives five times the life value compaed to the similaly sized TAC B seies. Easy Handling Easie to handle and use than tapeed olle beaings o thust spheical olle beaings due to the non sepaable design. Simplified Design Leads to Reduced Costs Peload is peset so assembly is fast and without any peload adjustment. Design of special pats fo peload adjustment is unnecessay, which saves time and cost. Lowe Rotational Toque Optimal intenal design fo lowe toque (i.e., in cases whee olle beaings ae cuently being used because of lage load, these beaings can be used to educe the beaing toque geneated by olle beaings). Coss Section of the Beaing fo Machine Tools and Injection Molding Machines Coss Section of TAC B With Seal Coss Section of TAC B Coss Section of TAC03AT

18 Special Seies Sealed Angula Contact Ball Beaings Othe Poducts High Pefomance Geases fo Machine Tool Spindles Suitable fo spindle maintenance ROBUST Seies and Standad Seies MTS, MTE, ENS Featues of Sealed Angula Contact Ball Beaings Featues of Geases fo Machine Tool Spindles Easy Handling No need to gease the beaing duing spindle assembly. Envionmentally Fiendly Sealed design avoids gease loss. MTS MTE ENS Contains uea thickene and delives highe heat esistance. Recommended fo use with ulta high speed machine tool spindles Fomulated to handle highe load capacities. Recommended fo use in high speed machine tool spindles. Envionmentally fiendly thanks to biodegadability. ROBUST Seies with T cage ROBUST Seies with TYN cage Standad Seies with TR cage Othe Poducts Sealed Pecision Spaces MTE and MTS ae available in 0 g tubes as well as 1 kg cans, and ENS is available in 2.5 kg cans. Sealed spaces eliminate the possibility of contamination Pecision spaces available fo machine tool spindles Chaacteistics of each gease Items Condition MTS MTE ENS Test Method Featues of Sealed Pecision Spaces Thickene Uea Baium Complex Uea Envionmentally Fiendly Sealed design pevents gease loss. High Reliability Reduced contamination fom dust o coolant in gease lubicated spindles. Labyinth stuctue Sealed space Base Oil Mixed Synthetic Oil Este Oil Este Oil Kinematic Viscosity of Base Oil JIS K C (mm 2 /S) 5.19 Woked Penetation 25 C, 60 W JIS K Dopping Point ( C) > 220 > 220 > 260 Evapoation (mass%) 99 C 22 H Oil Sepaation (mass%) 0 C 24 H JIS K JIS K B JIS K Oil outlet 32 33

19 Selecting the Right Beaing is Citical Pecision beaings ae designed to delive the high accuacy, high otational speed, and high igidity needed fo demanding machine tool applications. As each application has its own unique equiements, and each type of beaing has diffeent chaacteistics, it is essential to select the type of beaing based on the specific demands of a given application. Take Advantage of NSK Technical Suppot when Selecting Beaings NSK is committed to helping customes select the pope beaings that will delive the best pefomance based on the application involved. When designing a new spindle, including ulta high speed, specialized o custom applications, o making you beaing selection, please don t hesitate to ask us fo technical assistance. We have the expeience and expetise in state-of-theat, high speed, main shaft spindle technology to assue that you get the vey best beaings fo you application. Fo moe infomation on the latest NSK technology, please visit ou Web site o call today. Contents Pat3 Pat3. Beaing Selection P36 Typical High-Speed Main Shaft Spindle Stuctues P38 Othe Spindle Stuctues P40 Featues of Angula Contact Ball Beaings P42 Featues of Cylindical Rolle Beaings P44 NSK Web Site

20 BEARING SELECTION Pat 1 Pat 2 Pat3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 The chat below outlines the coect five step pocedue to follow when selecting the pope beaing fo a typical high-speed spindle application, including the factos to be consideed in each stage of the selection pocess. Remembe, NSK technical suppot is always at you disposal when designing a new spindle, an ulta high-speed spindle o a spindle fo a unique specialized application. We offe customes ou expeience and ou expetise in advanced technology. When designing a new main shaft spindle, we ecommend a thoough analysis of the desied 1 Main Shaft Spindle Concept Speed Rigidity Spindle Heat Geneation Running Accuacy Life Reliability spindle pefomance befoe selecting the beaing. In designing the spindle, it is necessay to detemine which pefomance facto is most impotant. Fo example, deciding if the otational speed is moe impotant than the igidity, o vice vesa. Once the pefomance factos ae pioitized poceed to the next step. Afte the pefomance analysis of the main shaft has been completed, the next step is to detemine the stuctue of Beaing Type Dive Type the main shaft. To detemine the optimum stuctue, consideation must be given to each individual component: the 2 Main Shaft Stuctue Beaing Aangement Lubication beaing design (ball beaing o olle beaing); combination (the numbe of ows); type of dive (belt, gea, coupling o integal moto); and lubication system (gease, oil-ai, oil mist, o jet). Cae must be taken to ensue that the stuctue Pat 3 Peload Method Jacket Cooling is compatible with the citeia and pioity established in you analysis of spindle pefomance. Please efe to the chat on Pages 38 39, which shows the elationship between the main shaft stuctue and its igidity and speed. 3 Main Shaft Size Shaft Diamete and Length Distance between Beaings Limiting Speed Main Shaft Rigidity Natual Fequency of the Shaft Beaing Seies Afte the stuctue has been detemined, the dimensions of the shaft must be detemined, including diamete, length, and distance between the beaings. The size of the main shaft will detemine the limiting speed of the beaing, the igidity of the main shaft, and the natual fequency of the main shaft. As the size, type, combination of beaing used, and the method of lubication all affect the limiting speed, please efe to Pat 4 and Pat 5 befoe making a final Pat 4 Pat 5 detemination. Once the size and type of the beaing ae selected, the specification of the beaing should be Fatigue Life Peload detemined. In ode to select the appopiate cleaance, o peload, of the beaing it is necessay 4 Beaing Pefomance Rigidity Beaing Heat Geneation Lubication Life Cleaance Running Accuacy Static Load Capacity to conside such factos as fatigue life, axial and adial igidity, and heat geneation. Cleaance o peload must be selected caefully, as these factos have the lagest impact on oveall spindle pefomance, especially duing high speed opeation. If the peload is wong it may cause poblems such as ealy failue o seizue. Sometimes it is necessay to epeat step 3, o even steps 2 and 3, befoe the most accuate spindle design is achieved. Pat 5 Afte the specification of the main shaft is complete, the final stage is the specification of the Shaft Run out Nut Tightening Foce assembly method. Accuacy of the shaft and housing at the beaing seats is impotant. Specify 5 Main Shaft Assembly Housing Accuacy Fit and Cleaance Checking Peload Checking Cleaance the fit and cleaance of the beaings to the shaft and housing. Use the coect nut tightening foce to fix the beaings. And double check that the peload, o cleaance, afte the beaing has been mounted is coect. Pat 6 Compession Amount of Retaining Cove Quantity of Oil Supply 36 37

21 TYPICAL HIGH-SPEED MAIN SHAFT SPINDLE STRUCTURES (Speeds Highe than 0.7 million d m n) Pat 1 Pat 2 Pat3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 1 Beaing Aangement 1 Oil-ai lubication Gease lubication d m n 3.5M d m n 2.0M Font side: Ulta high-speed angula contact ball beaing duplex sets (DT) Rea side: Ulta high-speed angula contact ball beaing duplex sets (DT) Spindles with this aangement ae suited fo ulta high speed opeation and use constant pessue peload. Although this spindle has lowe igidity it delives highe speed capability with a lowe tempeatue ise pefomance elative to a spindle with position peload. Applications: Machining Cente, Ginding Machine, High Fequency Spindle, etc. 2 Beaing Aangement 2 Rotational Speed (dmn) Oil-ai lubication Gease lubication d m n 2.5M d m n 1.5M Beaing Aangement 3 Font side: Ulta high-speed angula contact ball beaing quad sets (DBB) Rea side: Ulta high-speed single ow cylindical olle beaing (In case of angula contact ball beaings, eithe position o constant pessue peload is applicable) Spindles with this aangement will have lowe speed capability, and highe adial and axial igidity elative to Beaing Aangement2. Applications: NC Lathe, NC Milling Machine, Machining Cente, etc. Font side: Ulta high-speed angula contact ball beaing duplex sets (DB) Rea side: Ulta high-speed single ow cylindical olle beaing (In case of angula contact ball beaings, eithe position o constant pessue peload is applicable) Spindles with this aangement ae suited fo ulta high-speed opeation and use position peload. They achieve highe adial and axial igidity than spindles with Beaing Aangement1. It is possible to use a cylindical olle beaing on the ea side, fo bette slide pefomance. Applications: Machining Cente, Ginding Machine, High Fequency Spindle, etc. 3 4 Oil-ai lubication Gease lubication d m n 2.2M d m n 1.3M Oil-ai lubication Gease lubication d m n 2.2M d m n 1.3M Beaing Aangement 4 Font side: Ulta high-speed single ow cylindical olle beaing, angula contact ball beaing duplex sets (DB) Rea side: Ulta high-speed single ow cylindical olle beaing (In case of angula contact ball beaing, eithe position o constant pessue peload is applicable) Spindles with this aangement have high-speed capability simila to spindles with Beaing Aangement 3. As thee is a cylindical olle beaing in the font side, the adial igidity is high, so it is possible to have both high speed and heavy cuts. Applications: NC Lathe, NC Milling Machine, Machining Cente, etc. Beaing Aangement Beaing Aangement 6 Oil-ai lubication Gease lubication d m n 1.0M d m n 0.8M Font side: Ulta high-speed angula contact ball beaing tiplex sets (DBD) Rea side: Ulta high-speed single ow cylindical olle beaing (In case of angula contact ball beaing, eithe position o constant pessue peload is applicable ) Spindles with this aangement will have lowe speed capability, and highe adial and axial igidity elative to Beaing Aangement 2, and lowe speed capability and igidity elative to Beaing Aangements3and 4. Applications: NC Lathe, NC Milling Machine, Machining Cente, etc. Oil-ai lubication Gease lubication d m n 1.8M d m n 1.2M Rigidity of the Main Shaft Font side: High igidity double ow cylindical olle beaing, angula contact ball beaing duplex sets (DB) Rea side: High igidity double ow cylindical olle beaing Although spindles with this aangement have lowe speed capability, the adial and axial igidity of these spindles ae highest. Applications: NC Lathe, NC Milling Machine, Machining Cente, etc

22 OTHER SPINDLE STRUCTURES Pat 1 Pat 2 Pat3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 Boing Head High Pecision Spindle fo Lathe Ginding Spindle Live Cente High Fequency Spindle Wok Head Spindle 40 41

23 FEATURES OF ANGULAR CONTACT BALL BEARINGS Pat 1 Pat 2 Pat3 Pat 4 Pat 5 Pat 6 Pat 7 Pat 8 The main featues of the Angula Contact Ball Beaing (ACBB) A pedefined contact angle They ae used in matched combinations with peload In selecting Angula Contact Ball Beaings, it is impotant to conside the above two featues, as each angula contol ball beaing has specific featues and pefomance. Be sue to caefully conside the effects of changes in contact angle and peload on pefomance so that you select the ACBB that is best suited to the application. The following gaphs summaize the elative pefomance of each type of ACBB (by seies and dimensional seies), depending on the contact angle, peload, and combination. The Effect of Contact Angle As the contact angle inceases, Angula Contact Ball Beaings have a highe axial load capacity, but a lowe speed capability. Thus, the ACBB with a smalle contact angle is bette suited fo high speed and high adial load applications. The figue below compaes the igidity, limiting speed and tempeatue ise of a 7020 Angula Contact Ball Beaing with diffeent contact angles: C angle (15 ), A5 angle (25 ) and A angle (30 ). Unde the same light peload level (L), the beaing with C angle has highe adial igidity with lowe tempeatue ise elative to the beaing with A angle. The beaing with A angle has the highest axial igidity, thee times highe than that of the beaing with C angle, but the limiting speed is lowe than the othes. Pefomance Compaison of Each Type of Beaing (boe size 70 mm, DB combination, L peload) High Pecision ACBB Standad Seies 79_C 79_A5 70_C 70_A5 70_A Rotational Speed Radial Rigidity Axial Rigidity Dynamic Load Rating Gease Lubication Oil-ai Lubication Rigidity, N/μm Axial igidity Radial igidity Limiting d mn value _DB (L peload) C (15 ) A5 (25 ) A (30 ) Limiting dmn, 4 Beaing tempeatue ise, C Beaing tempeatue LIFE 7020_DB (L peload) C (15 ) A5 (25 ) A (30 ) Rolling fatigue life, h Ulta High-Speed ROBUST Seies 72_C 72_A5 72_A BNR19S BNR19H BNR19X BNR19XE BER19S BER19H BER19X BER19XE BNRS BNRH BNRX BNRXE BERS BERH BERX The Effect of Peload Peload affects pefomance of ACBBs in much the same way that the contact angle does. As peload inceases, the igidity inceases but the speed capability deceases. NSK has defined standad peload levels as Exta Light (EL), Light (L), Medium (M) and Heavy (H). The figue below compaes the pefomance of a 7020CDB with each peload level. Even if the contact angle is held constant, when the peload is lage, both axial and adial igidity ae inceased. Howeve the tempeatue also ises, so the limiting speed and calculated life become lowe. In ode to maintain high igidity, it is necessay to sacifice highe speed. Similaly to accomplish highe speed, it is necessay to sacifice high igidity. Caution must be execised. If too high a peload is combined with high opeation speed, thee is a possibility of seizue. Rigidity, N/μm Axial igidity Radial igidity Limiting d mn value CDB (Contact angle 15 ) L peload M peload H peload The Effect of Combination Limiting dmn, 4 Beaing tempeatue ise, C Beaing tempeatue LIFE 7020CDB (Contact angle 15 ) L peload M peload H peload Rolling fatigue life, h Thust ACBB BERXE BARS BARH BTRS BTRH (min 1 ) (N/μm) (N/μm) (kn) ACBBs ae usually used as multiple beaing sets. Thee ae thee types of combinations Back-to-Back (DB), Face-to-Face (DF) and Tandem (DT). Two ow, thee ow, and fou ow ae the most popula multiple beaing sets. When the combination is held constant, and the numbe of ows is inceased, the igidity and the load capacity become lage, but the limiting speed becomes lowe. Rigidity, N/μm Axial igidity Radial igidity Limiting d mn value C_L (peload) Single ow DB DBD DBB Limiting dmn,