Roll Neck Bearings for Section Steel Rolling Mills (Double-Row and Four-Row)

Specifications

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Roll Neck Bearings for Section Steel Rolling Mills (Double-Row and Four-Row)).

1. 1. Bore and housing bore dimensions

   This product: Inner diameter d 200～450 mm

   Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.

2. 2. Dynamic load rating based on life calculation

   This product: Basic dynamic load rating Cr 1560～8490 kN

   The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.

3. 3. Margin for static and shock loads

   The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.

4. 4. Operating speed and lubrication method

   The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.

5. 5. Precision grade and internal clearance

   Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.

6. 6. Materials and lubrication suited to the environment

   For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.

This guide was written by AI based on the listed products' documents and specification items.

About Rolling Bearings and all products

Description

A series of roller bearings used for V-rolls and roll necks in section steel rolling mills. Bore diameters range from 200 mm to 450 mm.

FAQ

Q. What types of rolling mills can the Roll Neck Bearings for Section Steel Rolling Mills (Double-Row and Four-Row) be used in?

A. They are used in section steel rolling mills and bar and wire rod rolling mills. They include double-row tapered roller bearings, four-row tapered roller bearings, and four-row cylindrical roller bearings used for V-rolls and roll necks of section steel rolling mills.

Q. What are the bore and outside diameter ranges of the Roll Neck Bearings for Section Steel Rolling Mills (Double-Row and Four-Row)?

A. The bore diameter d ranges from 200 to 450 mm, and the outside diameter D ranges from 280 to 620 mm.

Q. What is the basic dynamic load rating of the Roll Neck Bearings for Section Steel Rolling Mills (Double-Row and Four-Row)?

A. The basic dynamic load rating Cr ranges from 1560 to 8490 kN. Capability to withstand heavy loads is a key feature.

Written by AI based on the content of the source documents.

Source documents

• Catalog 圧延機ロールネック用軸受
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/