Servo-Electric Drive Option for the Injection Unit
Boy Injection-Molding Machines Now Available as Hybrid Version
At K 2019, Dr. Boy GmbH & Co. KG, Neustadt-Fernthal, Germany, unveiled an optional servo-electric drive for the injection unit (type: eSP) of its injection-molding machines. Martin Kaiser, Head of Design at Boy, explained the new option for the machine sizes Boy 60 E to Boy 125 E: “The newly developed injection unit, with the international size SP170, executes the injection and metering actions electromechanically via two servo motors. In its development, Boy’s experience with the design of hydraulic injection units was combined with that of the suppliers of high-quality drive components.”
According to Kaiser, the result is an efficient constellation of drive components, such as spindle, bearing, motors and inverters, installed in a high-quality casting. The very stiff axis of the injection unit ensures high precision and repeat accuracy. Together with state-of-the-art force measurement technology in a patent-pending configuration, an accuracy with a tolerance of ± 0.01 mm can be obtained for maintaining the switchover points of the preset injection profile.
Independent Mode of Operation of the Injection Unit.
The primary advantage of the eSP technology, however, lies in the independent mode of operation of the injection unit. Its rotational and axial movements are executed by two servo motors, completely detached from the machine hydraulics. This is especially advantageous for short cycle times and high metering rates.
Visitors to K 2019 were able to experience these drive options live for the first time on a Boy 100 E. The injection-molding machine with 1000 kN clamping force has a second servo pump. All movements during the injection molding process, such as ejector, core puller, metering, injection and mold, can be actuated simultaneously via the total of four independent servo-motor axes. At K 2019, the machine, with an 8-cavity mold, manufactured pharmaceutical measuring cups with material requirements according to ISO 10993. An encapsulated conveyor belt then fed the measuring cups dust-free to a tubular-bag packaging machine.
Customers will be able to order the optional ServoPlast units as an eSP option from the new year. These machine types are then identified with the affix “hybrid.”
In Düsseldorf, the new, more compact format of the Boy 100E was presented. Compared to its predecessor, the machine length is reduced by 460 mm. It thus now has a footprint of only 4.62 m².
Dr. Boy GmbH & Co. KG
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