NSKHPS Redefining the Standard Lower Maintenance Costs
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Reduced Bearing Usage
NSKHPS
Redefining th Continually developing products with greater strength and higher accuracy, NSK’s new NSKHPS fully incorporate the advantages of NSK’s world class design, materials, and manufacturing technology, setting a new standard for bearings.
LONG LIFE HIGHER LIMITING SPEED HIGH ACCURACY UNIVERSAL MATCHING WIDE RANGE LINEUP
15%
LONGER
Limiting Speed
15% HIGHER
Operating Life
Spherical Roller Bearings
60% LONGER
Operating Life
15%
LONGER
Ball Screw Support Angular Contact Thrust Ball Bearings
WHEN compared with conventional bearings
Angular Contact Ball Bearings
WHEN compared with conventional bearings
Operating Life
WHEN compared with conventional bearings
High Precision Angular Contact Ball Bearings
WHEN compared with conventional bearings
Cylindrical Roller Bearings
WHEN compared with conventional bearings
Deep Groove Ball Bearings
WHEN compared with conventional bearings
he Standard Operating Life
90% LONGER
Limiting Speed
20% HIGHER
Operating Life
2x
LONGER
Limiting Speed
20% HIGHER
Operating Life
15%
LONGER
NSK ‘Z’ Steel Extends Bearing Life he Standard Ultra Clean Steel Increases The Rolling Fatigue Life In the commitment to produce the most durable, highest quality bearings possible, NSK has been a leader in the development of ultra-clean steel for bearing rings and rolling elements. NSK ultra-clean steel is a highly pure vacuum-degassed, high-carbon chromium steel containing a minimum of non-metallic inclusions. Research proves that ultra-clean steel combined with the appropriate heat treatment significantly increases the rolling fatigue life of bearings. Steel used for bearing components requires the following characteristics:
• Good Hardenability • High Purity • High Rolling Contact Fatigue Strength • High Wear Resistance NSK Z Steel Bearings last longer.
Oxygen content is a measure of contaminants in steel. Improved production methods have greatly reduced oxygen content in NSK’s steel, resulting in longer bearing life.
Hardenability Bearings are heat treated to improve the hardness of the steel and give them greater life. In addition, alloys added to the steel/ carbon mix ensure that the hardness will be uniform throughout the component. These alloys include chrome, molybdenum, and nickel.
BALL
Purity During the steel-making process, a number of materials can enter and combine with the steel. Contaminants found in steel include silicone, aluminum and sulfur. When combined with oxygen, they form inclusions. Each type of inclusion affects bearing fatigue differently. Oxide inclusions weaken the steel. The total amount of oxide group inclusions in steel can be represented by the amount of oxygen in the steel; the higher the oxygen content, the lower the fatigue life. Vacuum-melt or vacuum-degassing processes control the amount of nonmetallic inclusions in bearing steel. Further developments by NSK in conjunction with steel manufacturers have resulted in even lower inclusion levels to improve quality and extend fatigue life. Prior to this, bearings meeting these specifications were manufactured from aircraft-quality steel at a premium cost.
Rolling Contact Fatigue Strength The fatigue strength of a bearing is greatly affected by the number of non-metallic inclusions in the steel. These inclusions present stress points where micro-cracks can develop. The repeated contact stress of the balls rolling over an inclusion causes additional stress in the steel surrounding the inclusion. The micro-cracks enlarge, weakening the material. Eventually these cracks break out at the surface of the raceway allowing a small piece to crack out. This is known as spalling. The reduced inclusion content of NSK steel reduces the overstressing of the material, thereby increasing its fatigue strength. Heat treating also improves the fatigue strength of the steel.
Wear Resistance These drawings show the progressive stages of subsurface-type flaking in relation to non-metallic inclusions. NSK uses ultraclean steel with very low inclusion levels to improve bearing life.
Although there is no way to stop the process totally, heat treating increases steel’s resistance to wear. For bearings, this wear resistance helps to prolong life under adverse conditions. NSK steels have the added benefit of more uniform heat treating. This ensures good hardness and excellent wear resistance. NSK has developed ultra-clean bearing steels to greatly improve the life of NSK products. Bearings now survive much longer than those manufactured with standard degassed steels. NSK researchers are constantly working on improvements that will further extend bearing life in the future. For more information, contact your nearest BSC Branch.
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B100-005 4/14
NEW SOUTH WALES