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Bearings - 13/05/2016

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NSK ball screw support bearings To help OEMs produce larger, electrically operated injection moulding machines, NSK is expanding the size range of its NSKTAC03 high-load ball screw support bearings from 120 to 180mm.

The growing prevalence of electrically operated injection moulding machines is a market trend being driven by the automotive sector, where the need to reduce vehicle weight and fuel consumption is creating demand for larger plastic components such as one-piece bumpers, door modules and interior components. In addition, such machines are cleaner (no oil) and more energy efficient and reliable.

In comparison with self-aligning thrust roller bearings (the conventional solution to date), the higher limiting speed of NSKTAC03 angular ball bearings leads to a quicker injection process and faster machine operation.

Additionally, only half the torque is required, which is caused by reduced bearing inertia that supports smooth rotation Angular contact ball bearings are also easier and quicker to assemble, and there is no need to adjust the preload, unlike with high-load roller bearings. Similarly, a shaft sleeve is not required.

A further important feature is that switching from self-aligning thrust roller bearings to NSKTAC03 ball bearings enables users to change from oil to grease, thus eliminating continuous oil refilling. In addition, lifting bolt holes now come as standard. The bolt holes facilitate the use of cranes to assemble the heavy bearings into the injection moulding machines, thus improving production efficiency at OEM plants.

The demand for ball screws with a higher load capacity has emanated from the need for ever-larger electrically operated injection moulding machines and servoless machines. This in turn has driven the requirement for support bearings able to offer greater performance under high loads.

Dedicated support bearings for high-load ball screws were first introduced by NSK in 1996, since when the company has continued to develop this important portfolio of solutions.

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