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18 December, 2018

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‘World’s fastest’ high-load ballscrews will cut cycle times

05 February, 2018

The Japanese bearings and ballscrews manufacturer NSK claims to have developed the world’s fastest high-load ballscrews, capable of linear speeds of up to 3m/s – twice as fast as conventional ballscrews, according to the company. The ballscrews have been designed to achieve faster accelerations and higher final speeds in applications such as clamping and dynamic axes for all-electric plastic injection-moulding machines.

The linear drives of the latest injection-moulding machines have to operate with higher accelerations and faster feed rates to meet the growing demand for shorter cycle times. The two new ballscrews – extensions to NSK’s HTF series of high-load ballscrew drives, which it launched in 1996 – have been developed to satisfy this demand.

In the first development, NSK has expanded its HTF-SRD series of ballscrews, designed for clamping duties in injection-moulding machines, by adding versions with larger leads. The high-load ballscrews, with top feed speeds of 2–3m/s, result in shorter cycle times and increased productivity for end-users. In addition, ball circulation has been optimised, reducing noise levels by up to half compared to conventional systems.

NSK's HTF-SRD ballscrews can hit top speeds of 3m/s

In the second development, NSK has added has added small and medium diameters (starting from 50mm) to its HTF-SRE series ballscrews, which were previously offered only in relatively large spindle diameters of 140–200mm. The new sizes will help to satisfy the high dynamic performance requirements of the latest injection-moulding machines. In addition, these ballscrews have much smaller nuts, with outer dimensions compatible with those of NSK’s HTF-SRC ballscrews, which are used in many injection-moulding machines around the world. 




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