Hybrid ball screws have ceramic rolling elements
A
Steinmeyer UK product story
Edited by the Engineeringtalk editorial team
May 6, 2005
Steinmeyer has added a new option to its standard line of precision ball screw products - hybrid ball screws using ceramic rolling elements.
Steinmeyer has added a new option to its standard line of precision ball screw products - hybrid ball screws using ceramic rolling elements.
By using balls manufactured from silicon nitride instead of tool steel, Steinmeyer is able to eliminate micro-welding in the ball nut.
The major benefits include longer lifetime, lower friction and less lubricant required.
In a preloaded nut, micro-welding typically occurs whenever the lubricant film breaks down between the balls and thread, resulting in direct metal-to-metal contact.
When the nut moves with respect to the screw, tiny bits of the steel balls break off and mix with the lubricant in the nut, thus contaminating it.
Over time, the solid metal chips in the oil or grease adversely affect the lubricant's ability to function effectively and cause adhesive wear.
Premature failure follows.
With dissimilar materials in contact, namely high grade tool steel for the shaft and nut body and silicon nitride for the recirculating balls, micro-welding is prevented.
The extra cost option of ceramic balls is available in the following ball screw sizes (diameter x pitch): 6 x 3, 8 x 1, 12 x 3, 16 x 5, 32 x 10, 40 x 5 and 40 x 10mm.
Other sizes are available on request.
Applications for hybrid ball screws include semiconductor production machines, inspection equipment, high precision grinders, medical and dental devices, aerospace robotics and analytical equipment.
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