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RTB-Bearings/Unitec Bearings

RTB-Bearings/Unitec Bearings
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RTB-Bearings/Unitec Bearings

Product catalog summary
Overview: The document provides comprehensive information on precision bearings for machine tools, focusing on products from Mondial and UNITEC, both ISO 9001 certified. Mondial specializes in power transmission components, while UNITEC designs and manufactures special precision cylindrical roller bearings.
Specifications: Various types of bearings are detailed, including RTB (Combined axial-radial roller bearings), RTB HS (high-speed), and RTB AMS (with integrated inductive encoder). Technical specifications and dimensional tables are provided for each type.
Procedures: The document includes assembly instructions, preload concepts, friction considerations, operating speed, and lubrication guidelines for RTB bearings, emphasizing high axial stiffness and load-carrying capacity for applications like rotating and indexing tables.
Standards and Calculations: Load ratings are calculated according to UNI ISO 76 and UNI ISO 281 standards. Methods for calculating stiffness values, including numerical methods and FEM analysis, are described to ensure precise and rigid movement.
Recommendations: Specific lubrication methods are suggested, highlighting the importance of selecting the appropriate bearing type and mounting arrangement for high-precision applications.
Additional Products: The document also covers SRB (Combined needle and roller bearings for screw drives), precision locknuts, and customized crossed roller bearings, each with technical specifications and applications.
Key Data: Tables and figures provide detailed dimensions, tolerances, and stiffness values for various bearing types, ensuring users can select the most suitable product for their needs.
Technical Specifications: The UNITEC RTB series is suitable for positioning and indexing tables due to high axial stiffness and ability to withstand high tilting moments. Stiffness values for various models are provided.
Mounting Instructions: Specific tolerances are recommended to avoid deflection or misalignment. Guidelines for mounting with rotating inner and outer rings suggest a press fit to improve accuracy and limit friction torque.
Preload Concept: Preloading bearings increases stiffness and rotational accuracy by eliminating clearance due to elastic yielding under load.
Friction Considerations: Friction in bearings is influenced by preload, lubricant viscosity, applied load, bearing size, and rotational speed. Recommended tightening torque values for screws are provided.
Rolling Torque: Rolling torque values for different RTB models are listed, with guidance on maximum values. The importance of maintaining minimum lubricant viscosity for calculating corrective factors for bearing life is emphasized.
General Description: RTB HS and RTB AMS series bearings are designed for high-speed applications. The RTB AMS series integrates an inductive angle measuring system for enhanced precision.
Lubrication: Lubrication requirements include the type of grease and relubrication intervals, stressing the importance of not exceeding recommended grease quantities.
Operating Speed: Operating speeds are specified for continuous and intermittent conditions, with considerations for lubricant viscosity.
Assembly Instructions: For high-speed applications, avoiding interference or press fit during mounting is advised to facilitate optimal speeds.
Technical Specifications: The RTB AMS series features an integrated AMOSIN inductive measuring system, offering high precision and resistance to environmental factors.
Technical Specifications and Features: The AMOSIN system is designed for high precision applications, using a non-magnetic, inductive principle. It is resilient to electromagnetic interference and environmental factors.
System Components and Configuration: The system includes a rigid steel measuring scale and integrated electronic evaluation circuitry, available in custom configurations.
Advantages: The AMOSIN system provides real-time output signals, supports high rotation speeds, and offers high measuring resolution.
Additional Tools: The STU-20 is an optional tool aiding in the setting procedure of the measuring system.
Conclusion: The AMOSIN inductive measuring system is a robust, high-precision solution suitable for various industrial applications.
RTB Bearings: Combined axial-radial roller bearings with integrated inductive encoders are stable and reliable, unaffected by magnetic tools or temperature variations.
SRB Bearings: Needle roller bearings designed for high precision and stiffness, suitable for supporting precision ball screws in machine tools.
Special Configurations: Options for RTB bearings without washers and SRB bearings with extended washers or fixing holes are available.
Dimensional Tolerances: Precision classes and tolerances for both axial and radial clearances are outlined.
Introduction: Mondial precision locknuts address precision and durability issues with traditional locknuts on recirculating ball screws.
Specifications: Locknut material is SCM 440, hardened; screw drive material is phosphor-bronze.
Locking Mechanisms: Various locking mechanisms are described, including HIF Side Locking, HIA Axial Locking, HIR Radial Locking, and HIK Axial Locking with Notch.
Tightening Torque: Guidance on tightening torques necessary to achieve an axial preload is provided.
Crossed Roller Bearings: UNITEC XRB series bearings are compact and capable of carrying high axial loads, radial loads, and high tilting moments.
Applications: UNITEC XRB bearings are used in machine tools, general automation, medical machinery, and defense industries.
Conclusion: Mondial precision locknuts and UNITEC crossed roller bearings offer high precision and durability for various industrial applications.
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Catalog excerpts

RTB-Bearings/Unitec Bearings-1

ENGINEERED BEARINGS PRECISION BEARINGS FOR MACHINE TOOLS CUSCINETTI Dl PRECISIONE PER MACCHINE UTENSILI

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RTB-Bearings/Unitec Bearings-2

MONDIAL UNITEC Mondial is a leading company in the import and distribution of power transmission components. Mondial always provides its customers with highly qualied products matched with an excellent logistic and technical support. Mondial is an ISO 9001 certied Company. Mondial, Azienda leader nell’importazione e commercializzazione di componenti meccanici innovativi e di elevata qualità, offre un servizio costantemente adeguato alle esigenze del mercato. Un servizio che integra dinamicamente l’organizzazione commerciale con quella tecnica e logistica, proponendo una completa gamma di organi...

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RTB-Bearings/Unitec Bearings-3

UNITEC, leading company in the design and manufacturing of special precision cylindrical roller bearings for machine tools and general industry, delivers high quality service and support to customers worldwide. Engineering partnership, technical and logistic services and our commercial network, supplied by different distribution channels, allows us to full unique application requirements on the marketplace. UNITEC is a certied ISO 9001 and ISO 14001 company, belonging to Mondial S.p.A. Group. Advanced technology to meet your customers requirements. Our engineers will assist you in selecting the...

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RTB-Bearings/Unitec Bearings-5

MONDIAL ■ PRECISION LOCKNUTS GHIERE DI PRECISIONE ■ TOLERANCES TABLES TABELLE TOLLERANZE SRB-F Radial needle roller combined bearings with axial cylindrical roller Cuscinetti radiali a rullini combinati con assiali a rulli cilindrici

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RTB-Bearings/Unitec Bearings-6

RTB Combined axial-radial roller bearings for indexing tables Cuscinetti assiali-radiali a rulli, per tavole di indexaggio TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE 2. STIFFNESS High stiffness, considerable load rating, high rotational accuracy are the essential features of the combined UNITEC RTB bearings. The axial cages with a high number of rolling elements with linear contact as well as a very high precision of the machining permit a precise and rigid movement. The size of the axial and radial rollers as well as of the inner and outer rings are carefully measured in order to obtain. The...

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RTB-Bearings/Unitec Bearings-7

Elevata rigidezza, grande capacità di carico, elevata precisione di rotazione, sono i requisiti fondamentali dei cuscinetti assiali – radiali UNITEC serie RTB. L’impiego di gabbie assiali ad elevato numero di corpi volventi con contatto lineare, oltre all’elevatissima precisione delle lavorazioni meccaniche, contribuisce ad ottenere un movimento preciso e rigido. Le dimensioni dei rulli, sia assiali che radiali, e degli anelli interno ed esterno sono calibrate in modo tale che al serraggio delle viti di ssaggio si ottengano i precarichi previsti. Le tolleranze, del valore del precarico sono particolarmente...

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RTB-Bearings/Unitec Bearings-8

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE Bearing assembled in housing and model for FEM analysis Schema di montaggio del cuscinetto e modello analisi FEM MOUNTING WITH THRUST WASHER (VSP) - MONTAGGIO CON RALLA DI SUPPORTO (VSP) In case a thrust washer is used in the assembly of the RTB bearing, the correct axial setting have to be evaluated. In this case, for any needed support, please contact our technical department. Nel caso di utilizzo della ralla di supporto, il cuscinetto RTB viene congurato a richiesta, valutando il corretto valore di registrazione assiale. Per ogni necessaria...

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RTB-Bearings/Unitec Bearings-9

STIFFNESS VALUES - VALORI DI RIGIDEZZA Stiffness values of rolling elements in preloaded conditions Rigidezze relative ai soli elementi volventi in condizioni di precarico teorico Stiffness values of a complete assembled bearing (°) Rigidezze relative al cuscinetto completo in condizioni di installazione di riferimento (°) Sigla Code Radial stiffness Rigidezza radiale Axial stiffness Rigidezza assiale Tilting stiffness Rigidezza momento ribaltante Radial stiffness Rigidezza radiale Axial stiffness (1) Rigidezza assiale (1) Tilting stiffness Rigidezza momento ribaltante KoRD (kN/μm) KoAX (kN/μm)...

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RTB-Bearings/Unitec Bearings-10

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE 3. ASSEMBLY INSTRUCTIONS As for assembly, we recommend to follow specications indicated in gure 3.1. Usually, tolerances can lead to different mounting situations such as deection or misalignments according to bore/outer diameter of bearings. 3. INDICAZIONI PER IL MONTAGGIO RTB Per il montaggio si suggerisce di rispettare le prescrizioni indicate nello schema riportato in gura 3.1. In generale questi campi di tolleranza possono portare ad avere, in funzione della corrispondente dimensione del foro/diametro esterno del cuscinetto, una situazione...

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RTB-Bearings/Unitec Bearings-11

Fig. 3.1 RTB assembly instructions Indicazioni di montaggio per RTB

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RTB-Bearings/Unitec Bearings-12

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE The preload of the bearings increases the stiffness and the rotational accuracy. In presence of a load from the outside, the preload of the bearing eliminates or avoids the clearance corresponding to the elastic yielding due to the load itself. In this case, for a given range of loads, the elastic deformations caused by the load are smaller rather than in a non-preloaded bearing. Assuming approximately the stiffness is linear (rollers in contact with tracks) at the same axial load, the axial deection is smaller in a preloaded bearings system rather...

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RTB-Bearings/Unitec Bearings-13

with preload con precarico without preload senza precarico Fig. 4.1 (1) System without preload - sistema senza precarico (2) Preload diagram - sistema con precarico Fo Fx = System with preload Fo - forza assiale esterna = Axial deection - spostamento assiale

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RTB-Bearings/Unitec Bearings-14

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE As for the bearings, the friction depends on many factors, the most important of which are: preload viscosity and amount of the lubricant applied load bearing size rpm Nei cuscinetti la resistenza complessiva al moto dipende da molti fattori, i più importanti dei quali sono: precarico viscosità e quantità del lubricante carico applicato dimensione del cuscinetto velocità di rotazione i.e.: A bigger preload turns out in a bigger rolling friction torque Tightening values affect considerably friction values. As for RTB bearings the xing of the inner...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.