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Development workers


March 2016


Injection molding machines (SGM) are indispensable in plastics processing. Since the industry realized their importance in the 1950s, Bosch Rexroth has supported their further development in close cooperation with machine manufacturers and has pushed ahead. Today, Bosch Rexroth offers the technology for each type of drive from a single source: variable-speed pump drives with fixed and variable displacement pumps for hydraulic actuators and electric drive technology for electric SGMs. All of the complex requirements associated with hybrid SGMs can also be fulfilled thanks to this wide-ranging expertise. Hydraulically, electrically and electro-mechanically: Drive technologies, to which Bosch Rexroth has contributed key technological milestones, take into account the diversity of molding compounds and the specific requirements of each during their processing.

Injection molding machine with hydraulic drive

Injection molding machine with hydraulic drive Magnifier

Some milestones in drive technology for hydraulic injection molding machines

1975 The first type 4WRZ proportional valves are used for the closing movement of injection molding machines.
1977 The first electro-hydraulic adjustment with servo valve for radial piston pumps
1979 Thanks to the A10 radial piston and the axial piston pump, roughly 30 to 40 percent less energy is used compared to previous systems.
1990 Introduction of the DFE proportional hydraulic adjustable axial piston pump
1997 The first injection molding machine with fieldbus valve from Rexroth
2009 The new Sytronix variable speed pump drives enable energy savings of up to 80 percent.
2015 Hägglunds CAb hydraulic radial piston motors are developed specially for injection molding machines.