Super Large Ball Screw offers leading load capacity
14 March 2016
NSK expanded its series of high load capacity ball screws, making it possible to injection-mould bigger plastic components in line with growing sectors.
The Super Large Ball Screw, which features 800mm long nuts to help increase axial load and operating life, is designed for electrically operated plastic injection moulding machines requiring a clamping force of 3000tons or more.
With the move towards more energy efficient automobiles and ever-stricter emissions regulations, there is an increased requirement to reduce vehicle weight. In turn, this creates demand for larger, single-piece plastic parts such as bumpers, door modules and instrument panels.
The traditional solution for forming large plastic components has been to use hydraulic injection moulding machines with high load capacities. However, the industry´s desire for clean, energy efficient systems has led to the emergence of large all-electric injection moulding machines. This trend has prompted NSK to develop a new generation of high load Super Large Ball Screw, for use in such machines.
To ensure the successful production of Super Large Ball Screws, NSK has developed an innovative new method of grinding nuts up to 800mm in length. The long nuts can accommodate a greater quantity of load balls, thus resulting in maximum axial load that is increased by a factor of 1.3, while operational life is extended by a factor of 2.8.
Despite the size and load capacity of NSK´s Super Large Ball Screws, there is no compromise in speed. A dedicated ball circulation design, which facilitates a tangential pick-up method using a proprietary deflector, makes it possible to achieve high speed rotation even with ball screws of 140mm in diameter or more.
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