Long Life Bearings for Steel Rolling Mills WTF ® Bearings NSK’ s newly devel oped Water TF ( WTF ®) bearings are the result ofcombining special steel-melting technology used for aircraft bearingmaterial, and our original, heat treat ment technology . Our WTF (water-tough) bearings successfully resist premature flaking under severely contaminated conditions of water-infiltrated grease lubrication and powder debris (iron-oxide) contamination. Furthermore, our WTF bearings have a bearing life that is three times longer than our conventional bearings.
5
Embed
Long-life Bearings for Steel Rooling Mills-wtf Bearings
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
7/18/2019 Long-life Bearings for Steel Rooling Mills-wtf Bearings
2. WTF technology among otherNSK long life technologies
3. Life of WTF bearings
Life, h
10 102 103
C u m u l a t i v e f a i l u r e r a t e ,
%
1
5
10
50
90
9999.9
Water supply: 20 cc/7 h
Size of fine iron powder particles:
max. 32 µm
P/C: 0.25
N=1 500 min–1
L10cal: 1 130 h
Grease: ADREX
Conventionalmaterial WTF®
Figure 3. Test results of tapered roller beacontaminated lubrication conditions of and fine iron powder simulating market c
12 44 22.2
127
4 1 6
3 6 2
φ φ
Purpose
Challenge
Measures
Bearing life test results under contaminated conditions of grease, water, and fine irosimulating the market are described in Figusage results of actual cold rolling mills are dFigure 4. Both results show a bearing life tlonger than that of conventional bearings.
Bearing type symbol
Example ofbearing number: WTF KVS3 4 3 4 5 5 1
Water TF
Bore diameter
Outside diameter
Figure 5. WTF bearing dime
5
Long L
7/18/2019 Long-life Bearings for Steel Rooling Mills-wtf Bearings
NSK Ltd. has a basic policy not to export any products or technology designated as controlled items by export-related laws. When exporting the products in thisbrochure, the laws of the exporting country must be observed. Specifications are subject to change without notice and without any obligation on the part of themanufacturer. Every care has been taken to ensure the accuracy of the data contained in this brochure, but no liability can be accepted for any loss or damagesuffered through errors or omissions. We will gratefully acknowledge any additions or corrections.
NSK LTD.-HEADQUARTERS, TOKYO, JAPAN www.nsk.comINDUSTRIAL MACHINERY BEARINGS DIVISION-HEADQUARTERS tel: 03-3779-7227AFTERMARKET BUSINESS DIVISION-HEADQUARTERS tel: 03-3779-8893AUTOMOTIVE BUSINESS DIVISION-HEADQUARTERS tel: 03-3779-7189PRECISION MACHINERY & PARTS tel: 03-3779-7163DIVISION-HEADQUARTERS
AfricaSouth Africa:NSK SOUTH AFRICA (PTY) LTD.
Johannesburg tel: 011-458-3600
Asia and OceaniaAustralia:NSK AUSTRALIA PTY. LTD. www.au.nsk.com
Melbourne tel: 03-9764-8302China:NSK HONG KONG LTD.
Hong Kong tel: 2739-9933Shenzhen tel: 0755-25904886