Among the exhibits from NSK’s comprehensive portfolio at this year’s EMO Hannover 2019 exhibition will be a number of notable products for machine tools, including the recently introduced range of DIN-standard ball screws and a new series of high-durability precision ball screws. Also being presented is a range of optimised spindle bearings for ever-higher precision and speed, while a further product set to be unveiled is a series of linear roller guides equipped with highly dustproof seals. Visitors to EMO Hannover, which takes place on 16-21 September, will find NSK at booth B34 in hall 7.
High-speed DIN-standard ball screws for machine tool applications
The NSK showcase at EMO Hannover will be headlined by the recently introduced DIN-standard ball screws, which are designed to offer high-speed and high-load capacity, as well as low noise. In fact, 1.4 times dynamic load rating can be achieved thanks to the use of NSK’s proprietary TF bearing steel.
Also in the spotlight will be NSK’s new range of high-durability precision ball screws, which make use of newly developed surface processing technology to reduce wear and realise maintenance-free operation for longer intervals. A special surface texture is applied to the raceways to greatly enhance oil film formation. It is typically difficult for a satisfactory oil film to form during low-speed, short-stroke, oscillating type operations. However, even under such conditions, high-durability precision ball screws are three times more resistant to wear than standard NSK products. The ball screws are ideal for machining centres that perform high-accuracy operations, such as mould and die machining, as well as EDM (electrical discharge machining) machines.
The NSK interchangeable ball screw for automated transfer (pick and place) systems will be another highlight at the show. Here, the shaft and nut are prepared individually, so that NSK can guarantee the specification for random matching, hence making them interchangeable. NSK interchangeable ball screws, which offer C7 accuracy grade, will be available in shaft diameters of 15-32 mm, and with leads of 5-20 mm. An NSK K1 lubrication unit can also be offered.
A further innovation on display will be the S-HTF ball screw series for injection moulding machines, which offers more than double the service life and 1.3 times greater dynamic load capacity than the company’s previous generation product.
Optimised spindle bearings for ever-higher precision and speed
NSK is set to showcase its recently introduced single-row cylindrical roller bearings with the designation ‘Robustride’. The main feature of Robustride series bearings is the cage, where geometry and guidance have been improved specifically for use on the spindle drive of machine tools. The results of this optimisation work include better distribution of the lubricant and, in turn, reduced and more uniform heat generation within the rolling bearing, thus minimising wear, even under high loads.
A further bearing solution will be in evidence with the Robust series of ultra-high-speed angular contact ball bearings featuring the Sursave cage, which will be displayed running on a machine spindle. The cage facilitates 20% less heat generation in comparison with conventional bearings operating under high-speed conditions.
High-performance linear motion
NSK will present its new RA series of linear roller guides with highly dustproof V1 seals and V1 bottom seals to help improve the operating life and reliability of machine tools. Dustproof performance and low frictional resistance has been achieved by optimising the seal lip shape and contact, and using a seal material with high abrasion resistance. The RA series will be displayed in a water box at EMO Hannover.
Also worthy of mention is a series of linear guide rails that offer the option of coating with a ceramic layer. Designed for machine tools that operate in harsh environments, the black, ultra-thin (~1 μm) coating provides high rust-inhibiting properties.
NSK at EMO 2019: hall 7, booth B34.
