SKF – Types of Super-precision bearingsIndonesia Industrial Parts

Description

With high running accuracy, high-speed performance and high system stiffness, SKF super precision bearings are ideal for machine tools and other precision applications, such as high-speed finishing mounts for steel wire, race car engines and transmissions, and innovative fluid treatment applications. These bearings also minimize noise, vibration and heat.

With the most complete variety available, it is possible to choose bearings that suit specific performance needs. SKF’s product range includes various bearing steel grades, including SKF’s trademarked NitroMax (for certain designs), which provides up to three times longer service life than standard steel bearings and hybrid bearings with ceramic rolling elements, which are particularly suitable for high-speed applications. New advanced materials and designs are in the implementation phase and will soon be available to support your needs for increased productivity.

Types of Super-precision bearings

Angular contact ball bearings

SKF manufactures super-precision angular contact ball bearings for shaft diameters from 6 to 360 mm. Application requirements vary, and as a result, the SKF assortment of super-precision angular contact ball bearings includes four ISO dimension series, in numerous executions. The wide selection of designs and variants enables them to be incorporated into virtually every machine tool application as well as other applications where precision bearings are required.

Cylindrical roller bearings

SKF super-precision cylindrical roller bearings are characterized by:

High speed capability
High radial load carrying capacity
High rigidity
Low friction
Low cross-sectional height

These bearings are therefore particularly well suited for machine tool spindles where the bearing arrangement must accommodate heavy radial loads and high speeds, while providing a high degree of stiffness.

SKF super-precision single row cylindrical roller bearings have a higher speed capability than double row bearings while double row bearings are more suitable for heavier loads.

Double direction angular contact thrust ball bearings

SKF double direction angular contact thrust ball bearings are designed to locate spindle shafts axially in both directions. These bearings are intended for mounting in combination with cylindrical roller bearings in the NN 30 K or N 10 K series in the same housing bore. This bearing combination simplifies machining of the housing bore.

Double direction angular contact thrust ball bearings are manufactured with the same nominal bore size and outside diameter as corresponding cylindrical roller bearings. However, the outside diameter tolerance of the housing washers, combined with the housing bore diameter and geometric tolerances recommended for super-precision cylindrical roller bearings under light to normal load and rotating inner ring load will result in an appropriate radial clearance in the housing bore. This clearance is sufficient to prevent radial loads from acting on the thrust bearing provided that its outer ring is not axially clamped in the housing.

Axial-radial cylindrical roller bearings

Super-precision axial-radial cylindrical roller bearings are commonly used to support rotary tables, indexing heads and multi-spindle heads on machining centres. SKF manufactures super-precision axial-radial cylindrical roller bearings for shaft diameters from 80 to 850 mm. Their internal design, together with close tolerance manufacturing processes, enables these bearings to attain radial run-out better than, and axial run-out close to, P4 tolerance class.

Angular contact thrust ball bearings for screw drives

Machine tools require screw drives that can position a work piece or machine component quickly, efficiently, and precisely. To meet these requirements, screw drives can be supported at both ends by SKF super-precision angular contact thrust ball bearings. The bearings provide a high degree of axial stiffness, high axial load carrying capacity, accommodate high speeds and rapid accelerations, and offer very high running accuracy.

Angular contact thrust ball bearings for screw drives are well suited for screw drive applications, but are also beneficial in other applications, where reliable radial and axial support is required, together with extremely precise axial guidance of the shaft.

Precision lock nuts

Industrial lock nuts with lock washers are not considered to be suitable for super-precision bearing applications because of the relatively wide manufacturing tolerances of the thread and abutment surfaces. As a result, SKF has developed a full line of precision lock nuts that are manufactured within very tight tolerances. These simple to mount devices, which locate bearings and other components accurately and efficiently on a shaft, meet the requirements of machine tool applications, both technically and economically.

Gauges

Conventional measuring instruments are often not accurate enough to measure critical components in cylindrical roller bearings, especially in precision applications. SKF has developed a range of specialized measuring instruments, such as the GRA 30 and DMB series for checking tapered seats, and the GB 30, GB 10 and GB 49 series for measuring the inner or outer casing diameter of roller sets. These measuring instruments are designed to provide highly accurate measurement results, ensuring that bearing installation is carried out correctly and optimally. Using SKF measuring instruments, technicians can precisely set radial internal clearance or preload, thereby improving bearing performance and life.

Source: SKF.com