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NSK: Components for improved machining results

NSK will use AMB 2024 to showcase the latest series of rolling bearings, ball screws, and linear guides for machine tools.

The new Robustdyna spindle bearing for machine tools.
(Image:NSK)

The Robustdyna angular contact ball bearings for spindles in machine tools are among the series in focus. These high-performance and high-speed bearings with high load capacities are designed to enable excellent results in combined roughing and finishing operations. By using larger balls, the maximum load capacity of these angular contact ball bearings increases by up to 15 percent compared to the previous series. Users are expected to benefit from simplified machining of challenging materials such as Inconel, titanium, and composite materials. With up to three times higher dynamic load capacity, Robustdyna improves both heavy-load and high-speed machining.

For angular contact ball bearings used in the main spindle of machine tools, NSK has developed the Sursave (TSR) bearing cage. As the outer ring guided Sursave cage, made of high-performance PPS plastic, causes 20 percent less friction than bearings with conventional cages, manufacturers and users of machine tools can anticipate energy savings. Additionally, higher workpiece precision is achieved due to reduced thermal expansion of the spindle.

New linear technology for precision machining

NSK is also showcasing innovations in linear drives. With the next generation of high-precision ball screws, which are characterized by minimized motion errors ("second quadrant glitches"), the machining quality of machine tools can be enhanced to the extent that fine finishing processes such as polishing may potentially be eliminated. Moreover, the reduced drive torque leads to energy savings.

The newly developed low-temperature ball screw exhibits approximately 45 percent lower friction losses and therefore also reduces heat generation compared to conventional ball screws—while maintaining the same stiffness. This improvement enhances positioning accuracy. Furthermore, the low-temperature ball screw contributes to reducing the energy consumption of machine tools by decreasing or even eliminating the need for cooling.

The linear guides of the DH/DS series.
(Image:NSK)

A crucial component for achieving processing precision with new generations of machine tools is the linear guides. The recently introduced DH/DS series offers, according to the manufacturer, a dynamic load capacity that enables a running life more than double that of the established NH/NS series, which already achieves a long lifespan. This innovation is intended to facilitate downsizing from the machine builder's perspective, as it allows for the use of smaller linear guides. This reduction not only decreases the installation space and machine weight but also lowers energy consumption.

NSK at AMB 2024: Hall 2, Booth C44

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AMB 2024

NSK: Components for improved machining results

New linear technology for precision machining

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