NSK S-HTF high-load series ball screws offer 2.2 times more service life than the company’s previous

NSK S-HTF high-load series ball screws offer 2.2 times more service life than the company’s previous

NSK’s ball screws ride on Tough Steel

Japanese major has developed S-HTF high load ball screws with screw shafts and nuts manufactured from a new steel material called ‘Tough Steel’ that delivers optimised hardness and resilience

September 2017

The newly-developed S-HTF series ball screws from NSK offer more than double the service life and 1.3 times greater dynamic load capacity than the company’s previous generation product, according to a statement from the company.

These performance attributes have been achieved thanks to the use of a new steel material for the screw shaft that delivers an optimised combination of hardness and resilience. Specially developed by NSK, the aptly-named ‘Tough Steel’ (TF) is already being used in the company’s rolling bearings with great success, it said.

The S-HTF ball screw has been designed for high-load applications, such as those found in plastic injection-moulding machines and forming presses. With demand for plastic products set to continue growing in coming years, component manufacturers increasingly want machines that operate with shorter cycle times and greater productivity. However, this has consequences for the electric linear drives of the clamping units. They move faster and – depending on the application – with increased clamping force, yet they are expected to last as long, if not longer than existing-generation solutions.

To meet these demands, NSK has developed S-HTF ball screws with screw shafts and nuts manufactured from TF. The high-purity of TF enables – in combination with special heat treatment – the surface of the material to be more resistant. This ensures that no cracks develop from indentations in the material caused by rolling over particles of contamination. Instead, the surface is simply ‘smoothed out’ by the roll-over pressure.

Field trials at customers in Japan show that NSK’s S-HTF series high-load ball screws have a service life 2.2 times greater than its predecessor, the HTF series, along with improved load capacity.

The S-HTF series is currently available with shaft diameters from 50 to 100 mm, and leads of 10 to 60 mm (depending on diameter). Overall, there are 21 variants of the new series available. They are not only suitable for the electric clamp axes of injection-moulding machines, but for other high-load applications such as servo presses.

Established 100 years ago, NSK (Nippon Seiko Kabushiki Kaisha) is a Japanese-listed company that has evolved from a regional ball bearing supplier to a roller bearing specialist and automotive supplier with a global market presence. Today, NSK employs more than 31,500 employees in 30 countries. As per March 2017 NSK achieved a turnover of 950 billion Yen. This result has been driven by investment in research and development, enabling the company to continuously improve the quality of its products and services. In addition to a complete rolling bearing portfolio, NSK develops and manufactures precision components and mechatronic products, as well as systems and components for the automotive industry, including wheel bearing units and electric power-steering systems.

In 1963, NSK’s first European subsidiary, Düsseldorf, Germany, was opened and in 1976, the first European production facility in Peterlee, England. Today, NSK Europe supports pan-European sales with production locations in England, Poland and Germany, logistics centres in the Netherlands, Germany and England and technology centres in Germany, England and Poland. In 1990, NSK purchased the UPI Group including the renowned European bearing manufacturer RHP, with its factory in Newark (UK). Additionally, NSK has developed a comprehensive network of authorised sales distributors. NSK Europe is divided into application-based business divisions: Industry rolling bearing technologies & linear and precision technology (EIBU) as well as bearing modules and steering systems for the automotive industry (EABU & ESBU). In this organisation, NSK Europe›s 3,600 employees achieved a turnover of over 1,000 million Euros as per March 2017.

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