Super Precision Bearings for Machine Tools

Transcription

1 Supe Pecision Beaings fo Machine Tools Outstanding speed, igidity, and pecision delive impoved machine tool pefomance while educing enegy loss and placing less buden on the global envionment.

2 NSK s key technologies meet the demand fo high pefomance pecision beaings and envionmental pesevation. Tibology, the study of fiction and wea, is a coe NSK technology that not only saves enegy and esouces by deceasing fiction and wea on machines, but also pevents machine malfunction and theeby impoves eliability. NSK has established fou key technologies aound this cental expetise as the foundation fo developing envionmentally sound poducts. These ae: analysis technology towad compehensively educing enegy loss; evaluation technology fo pecisely meeting maket needs; lubication technology fo educing enegy loss and making highe pefomance compatible goals and mateial technology to extend poduct life. Analysis Technology NSK developed its own softwae, Beaing Analysis In NSK (BRAIN), which enables digital simulations of fiction-elated movement and pefomance by applying tibology. The combined use of this simulation data with a finite element method (FEM) leads to the ealization of advanced compute-aided engineeing (CAE). 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 ultahigh-pecision measuing instuments. Ou evaluation technology contibutes to the development of cutting-edge poducts that coespond with inceasingly sophisticated maket needs. Lubication Technology Though the elentless application of tibology, NSK s key technology, NSK has pusued lubication technologies that allow machines to delive maximum pefomance. NSK s accomplishments in these effots contibute to saving enegy and esouces, theeby conseving the global envionment. 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 maintenancefee and suppot vaious applications thoughout many industies. 1 2

3 Machining Cente Beaings (Gease Lubication) Eco-fiendly lubication that achieves the same high-speed egion as oil-ai lubication NSK s gease technology suppots speeds that ae nomally only possible with oil-ai lubication systems. These high pefomance, enegy-saving machining cente beaings also exhibit outstanding noise eduction. High-Speed, High Pecision Sealed Angula Contact Ball Beaings ROBUST Wide Seies NSK impoves machine tool eliability by poviding highe pefomance and geate duability. This seies of beaings futhe povides excellent suppot towads a clean woking envionment and saving enegy. 1. Longe life when using gease lubication 2. Low-heat geneation 3. High eliability and shote assembly pocess time Duability compaison between open beaing and beaing with seal Open ROBUST Seies Sealed-type ROBUST Seies Sealed-type ROBUST Wide Seies Gease duability, h NSK test data Test Conditions: Boe diamete of beaing: 6 mm; Ceamic ball specification; Rotation: 18 min -1 (dmn = 1 48 ); Lubication: MTE gease Gease Replenishing System fo High-Speed Gease Lubication Spindles New automatic lubication system convets conventional oil lubication methods fo high-speed spindles. 1. High-speed pefomance and long life ensued with gease lubication. 2. Capable of poviding moe than 1 maintenance-fee hous. 3. Envionmentally sound, low-noise beaing saves enegy. Coss-section of spindle Stoage goove fo dischaging gease Replenishing gease Housing Space fo dischaging gease High-speed angula contact ball beaing Stuctue fo Feeding Gease to Beaings High Pecision Angula Contact Ball Beaings Standad Seies NSK s basic seies of pecision angula contact ball beaings confoms to ISO specifications. 1. Long life beaing steel (Z steel) used as standad mateial. Z steel offes 1.8 times longe life when compaed to standad beaing steel. 2. The 7 and 79 seies ae available in sealed fom and offe 1. times geate gease duability. 3. Two types of cages ae available fo specific beaing types. High Pefomance Double-Row Cylindical Rolle Beaings Low-Heat Geneation NN-Z Seies New mateial and design fo the beaing cage enhance machine tool pefomance. 1. High-speed pefomance and low-heat geneation 2. Longe life with gease lubication 3. Low-heat geneation seies specifically fo fee-end beaings High-Speed Integated Moto Spindle fo Machining Centes Achieved 2 min -1 with ISO-4 equivalent tape using NSK s automatic gease eplenishing system. 1. Highest speed fo NT#4 class high-speed machining cente using gease-lubicated beaings 2. 1 maintenance-fee hous ae made possible by the NSK gease eplenishing system. 3. Wide ange of machining pefomance fom low to high speeds High-speed, integated moto spindle 1 -hou enduance evaluation Oute ing tempeatue of font side beaing Time, h High Pefomance Gease Poducts (MTS, MTE, and ENS) fo Machine Tools n Gease featues MTS: Fo high-speed otation. Contains uea thickene and exhibits excellent heat esistance. MTE: Fo high-speed otation offes outstanding load capability. ENS: Envionmentally fiendly due to its biodegadability. Tempeatue ise, C NT#4 14 min -1 2 min

4 Machining Cente Beaings (Oil-Ai Lubication) Oil-ai lubication educes enegy loss in ultahigh-speed applications NSK machining cente beaings facilitate high-speed otation in ultahigh-speed applications, which equie extemely eliable oil-ai lubication, while achieving envionmental fiendliness and enegy consevation. New Oute Ring Guided PPS Engineeed Polyme (TS) fo ROBUST Angula Contact Ball Beaings movement is contolled by the beaing and achieves low toque duing high-speed otation, and new cage lowes enegy loss. Compaed with existing phenolic cages: 1. 2% less heat geneation with low tempeatue ise 2. 2% highe speeds 3. % decease in cage unout Ultahigh-Speed, High Pecision Angula Contact Ball Beaings ROBUST Seies These beaings integate the pide of NSK mateial, evaluation, and analysis technologies into a highly functional seies that suppots high pefomance machine tools. 1. TS cage facilitates even lowe heat geneation and highe speed otation. 2. X-type achieves high-speed pefomance and long life though the use of mateial, which delives outstanding esistance to heat and wea. 3. Extensive lineup available fo specific applications Ultahigh-Speed Single Row Cylindical Rolle Beaings ROBUST Seies This seies achieves dmn 2 2 using highly heatesistant PEEK cage and mateial, which delive outstanding heat and wea esistance. Tempeatue ise of oute ing, C Rotational toque, N cm Rotational Toque Compaison 1 Test conditions: Beaing: 7BNR1H Speed: 2 min -1 Constant pessue peload: 1 N Lubication: Gease Tempeatue Rise Compaison New Oute Ring Guided PPS Engineeed Polyme (TS) fo ROBUST Angula Ball Beaings Existing Oute Ring Guided Phenolic Test conditions: Beaing: 7BNR1XDB Lubication: DTE Light oil (VG32) Peload method: Position peload Cooling: Non-cooling 1 1 Speed, min -1 New Oute Ring Guided PPS Engineeed Polyme (TS) fo ROBUST Angula Ball Beaings Existing Oute Ring Guided Phenolic 1 1 Speed, min Optimal design enabling low-heat geneation. 2. Seizue-esistant pefomance impoved though use of mateial. 3. Heat-esistant, highly igid, PEEK engineeed polyme boosts speed. 2 2 Ultahigh-Speed, High Pecision Angula Contact Ball Beaings ROBUST Seies Spinshot II In the quest to optimize oil supply, NSK has achieved unpecedented low-noise chaacteistics while eaching highe otational speeds. Centifugal foce Aiflow Suface tension Oil dop Oil paticle sepaation point 1. Achieves 4 min -1 with ISO-4 equivalent tape using oil-ai lubication. 2. Noise levels educed by 3 db to db compaed with conventional oil-ai lubication. 3. Achieves 4 min -1 with appoximately half the ai volume of conventional oil-ai lubication. Spinshot II Stuctue Diagam Ai pessue deceases at goove on cicumfeence Small Diamete, Ultahigh-Speed, High Pecision Angula Contact Ball Beaings ROBUST BGR Seies This highly functional seies suppots high pefomance of small spindles with boe diametes of 3 mm o less, deliveing high pecision and ultahigh-speed otation. 1. Ultahigh-speed beaings ae specially designed fo small spindles. 2. X-type achieves high-speed pefomance and long life though the use of mateial with excellent heat and wea esistance. 3. Standadized fo ISO Class 2. Tempeatue ise of oute ing, C Tempeatue Rise of Font Side Beaing 1 2 Speed, min -1 3 Beaings used: 6BAXTD fo font side; 8NXETD fo ea side 4 Speed Ultahigh-Speed Regions 6

5 Lathe Beaings Addessing envionmental consevation while maintaining both outstanding igidity and high-speed pefomance This lineup poves supeio fo educing enegy loss by esticting heat geneation while achieving outstanding igidity and high speed. Ceamic ball type pefomance also geneates less heat while deliveing enhanced igidity and pecise pefomance. Rolle-Guided PPS Resin (TB) with Engineeed Polyme Use of high-stength engineeed polyme L-PPS educes defomation caused by centifugal foce and facilitates stable otation in high-speed applications. This is a long-life cage with low tempeatue ise. High Pecision Ultahigh Pecision Ceamic Angula Contact Ball Beaings ROBUST Ultahigh Pecision Specification P2X This seies achieves the wold s highest otational accuacy, exceeding ISO Class 2 fo high-pecision pocessing of small lathes. 1. Ultahigh otational accuacy 2. NRRO value is guaanteed. 3. Ceamic ball pecision is significantly impoved. FEM Analysis of Defomity 1. Optimal olle-guided cage design with consideation fo stength and fiction 2. Use of high-stength engineeed polyme L-PPS facilitates stable otation in high-speed applications. 3. Achieves longe life with gease lubication in compaison with that of metal cages. High Speed High-Pecision Thust Angula Contact Ball Beaings ROBUST Seies The ROBUST seies featues high-speed pefomance and low heat geneation without compomising igidity. BTR with contact angle 4 : High thust igidity and low-heat geneation ae compatible. BAR with contact angle 3 : Geate emphasis on high speed than BTR High Rigidity Highly Functional, Double-Row Cylindical Rolle Beaings High Rigidity ROBUST TB Seies High Rigidity High-Pecision Thust Angula Contact Ball Beaings TAC-F Seies New mateial and cage design enhance machine tool pefomance. A highly pecise thust angula contact ball beaing with pioity placed on igidity at a contact angle of. 1. Achieves high-speed and low-heat geneation. 2. Longe life possible with gease lubication Tempeatue ise of oute ing, C Low-Heat Geneation Compaison Tempeatue ise with gease lubication Metal cage MB coppe alloy New engineeed polyme TB (L-PPS) Beaing: NN319 Lubication: Gease Beaing cleaance: µm Speed, min d mn 1TAC2F 1BTR1S 1BAR1S Limiting Speeds of ROBUST Seies and TAC-F Seies with Gease Lubication (when lightly peloaded) Speed, min d mn Axial displacement, µm Axial Load and Axial Displacement of ROBUST Seies and TAC-F Seies 1BAR1STYNDB (α =3 ) 1BTR1STYNDB (α =4 ) Axial load, N 1TAC2F (α = ) 7 8

6 Ball Scew Suppot Beaings (Gease Lubication) Gease lubication ensues duability and educes enegy loss Two types of beaings with eliable seals; light contact seals with supeio dust poofing qualities o non-contact seals that achieve low toque. Eco-fiendliness is now achieved in the aea of pecision pocessing in which oil lubication is conventionally used to pevent fetting, by taking advantage of optimum gease o ceamic balls. Sealed Angula Contact Thust Beaings Seies fo Ball Scew Suppot A sealed type seies has been added to boaden this poduct line with outstanding high pefomance and high igidity fo ball scew suppot. 1. Adopts long-life, highly eliable EP steel fo tiple the opeating life ove standad beaing steel. 2. Gease lubication extends duability. 3. High igidity achieved with an angula contact of Light-contact seal achieves high dust esistance and low tempeatue ise. New Gease Specialized fo Ball Scew Suppot Beaings EA9 With low tempeatue ise and high fetting esistance, this gease is suitable fo highe pecision pocessing. Fetting Evaluation Using Gease (48-hou enduance) EA9 AS2 Wea detected Evaluation time, h No anomalies Tempeatue ise, C Low Tempeatue Rise Compaison Evaluation time, min. AS2 EA9 Evaluation conditions: Beaing: 3TAC72BDFDC1OPN7A; Oscillating angle: 2. ; One cycle:.4 seconds Evaluation conditions: Beaing: 2TAC47BDFDC1PN7A; Gease quantity: 2 g (% of space capacity); Maximum opeating speed: 2 8 min -1 n Light-contact seal with dust-esistant chaacteistics boosts eliability Adopts NSK s popietay light-contact seal focusing on high speed. Limited tempeatue ise ensues outstanding eliability. Gease leakage, % Gease Leakage Compaison Open type With light-contact seal NSK test data Tempeatue ise in oute ing, C Compaison of Tempeatue Beaing Rise 1 min -1 d m n = 47 2 min -1 d m n = 94 3 min -1 d m n = 141 Open type With light-contact seal NSK test data Ball Scew Suppot Beaings Ceamic Ball Specifications Achieves low tempeatue ise using ceamic balls fo ball scew suppot beaings. Also featues excellent anti-fetting chaacteistics with a duability of moe than times that of steel balls. Evaluation conditions: Beaing: 3TAC72BDFDC1PN7A; Gease: Alvania (AS2); Oscillating angle: 2. ; One cycle:.4 seconds Ceamic ball Steel ball Fetting Evaluation with Ball Mateials (4-hou enduance) Wea detected in 8 hous. 1 2 Evaluation time, h 3 4 No anomalies Test conditions: Beaing: f 3 x f 62 x 1 mm; Combination: DFD Peload: 4 N tempeatue: oom tempeatue; Speed: 3 m -1 n Extensive Lineup Test conditions: Beaing: f 3 x f 62 x 1 mm; Combination: DFD Peload: 4 N; Tempeatue: oom tempeatue Ball Scew Suppot Beaings Ball Scew Suppot Unit Impoved ease of handling by incopoating ball scew suppot beaings into unit. Open type DDG with light-contact seal Special lip shape V1V with non-contact seal 1. Designed with dustpoofing chaacteistics to facilitate design of ball scew suppot pats. 2. Easie to handle since the beaings ae aleady mounted in the housing. 9 1

7 Beaings fo Rotay Axes (Gease Lubication) Specially designed angula contact ball beaings aid in educing enegy loss fo swiveling (otay/tilt) spindle heads and otay/tilt tables used in machine tools New beaing available fo high-pecision machine tools using multi-axis pocessing. Angula contact ball beaings achieve high igidity and low toque fo swiveling spindle heads used in machine tools in which olle beaings wee peviously used. Low pofile, Highly Accuate, Angula Contact Ball Beaings ROBUST Slim Seies n Rotational Runout Measuement Specially designed angula contact ball beaings fo swiveling spindle heads and otay/tilt tables used in machine tools. These beaings allow fo a high otational accuacy found only in beaings with high moment stiffness that is on a pa with cossed-olle beaings. 1. Lowe toque otation is achieved with ball beaings. 2. Rotational unout of. µm o less achieved. 3. High moment stiffness is on a pa with cossed-olle beaings. 4. Thin coss-section pofile is 3% thinne than that of a standad angula contact ball beaing. Moment Stiffness Compaison Conventional cossed-olle beaings 1.67 µm Rotational unout less than 1/3 Newly developed ROBUST Slim Seies.38 µm 1. Angle inclination, 1 4 ad Same size olle ROBUST Slim BSRA 17 Toque, Nm Rotational Toque Compaison (numbe of otations 1 min -1 ) ROBUST Slim BSRA 17 Equivalent size olle Rotational unout measuing equipment Moment, Nm sec Time n BRSA Seies (boe diamete: 13, 17, 22, 34 and 4 mm) Beaing numbes Bounday dimensions (mm) d D B (min.) Basic load atings (kn) C (Basic dynamic load ating) C o (Basic static load ating) fd fd Eco-fiendly Beaings with Seals The ROBUST Slim seies is packed with gease afte cleaning and emoving oil. Poduction lead time is significantly shotened since the beaings can be mounted into machines immediately afte opening thei packaging. In addition, use of gease lubication eliminates atomizing of oil that is geneated in oil lubication fo an oveall cleane wok envionment. BRSA13S DB BRSA17S DB BRSA22S DB BRSA34S DB B BRSA4S DB

8 Beaing Components Angula Contact Ball Beaings Angula Contact Thust Beaings fo Ball Scew Suppot Polyamide Phenolic PPS (TS) Seal Nitile ubbe, SECC Seies Standad ROBUST Type Ceamic ball type S H X Rolling elements Polyamide 46 (TYN) Phenolic (TR) Polyamide 46 (TYN) Phenolic (TR) PPS (TS) Seal (black) Nitile ubbe, SECC EP Polyamide Bass Seal (bown) Nitile ubbe, SECC EP Polyamide 66 Cylindical Rolle Beaings Low-Pofile Angula Contact Ball Beaings fo Rotay/Tilt Applications PPS (TB) Seal Nitile ubbe, SECC n NN3 Type Standad Rolling elements PPS (TB) Polyacetal Polyacetal PEEK (TP) n N1 Type RS RX RXH Rolling elements PEEK (TP) Supe Pecision Beaings Catalog NSK has compiled all the infomation it has accumulated about pecision beaings ove the yeas into a single catalog. The catalog contains a wealth of technical data egading pecision beaings as well as the infomation equied and key points fo selecting beaings, pecautions fo handling beaings duing mounting, and so on. Fo details, please contact NSK o visit to equest this compehensive Supe Pecision Beaings catalog. CAT. No. E

9 CAT. No. E127a 21 C-3 Pinted in Japan NSK Ltd. 21