Martin Kaiser, BOY-Design Manager, explains the new option for machine sizes from BOY 60 E to BOY 125 E: With the entirely new developed injection unit with the international size SP170, the injection and metering movements are electromechanically driven by two servomotors. Integrated in this development of the new Servo-Plast-Unit are the experiences with the construction of hydraulic injection units from BOY with those of the suppliers of the highest quality drive components. The result is an optimum constellation of drive components such as spindle, bearing, motors and converters, installed into a high quality cast construction. The extremely stiff designed injection axis guarantees maximum precision and repetitive accuracy. In combination with state-of-the-art force-measuring-technology in an optimal arrangement (patent pending), the highest accuracy in maintaining the switching-points of the set injection process is guaranteed within a tolerance of +/- 0.01 mm.
The primary advantage of the eSP technology, however, is the independent operation of the injection unit. The rotational and axial movements of the new Servo-Plast-Unit are carried out electromechanically by two servo-motors - completely independent of the machine hydraulics. This is an advantage for short cycle times and high metering quantities.
All movements of the injection moulding process such as ejector, core puller and mould, as well as electromechanical dosing and injection, can be controlled simultaneously via the four independent servo-motor drive axes. Also new is the more compact format of the BOY 100 E. Compared to the predecessor model, the machine length is reduced by 460 mm; this corresponds to a new footprint of only 4.62 m².
The optional Servo-Plast-Units can be ordered from BOY as an eSP option. These machine types are labeled with the name affix "hybrid".