Servo-Electric Core-Pulling Units

Servomold, a supplier of injection mold tooling automation, is presenting a new generation of SLY-type, servo-electric, core-pulling units, positioning them as a compact, powerful and clean alternative to hydraulic and pneumatic cylinders. Equipped with ball screw drives, the core-pull units can achieve positioning of slides, cores and plate movements in injection molding tools with accuracy down to the micron, according to Servomold.

To ensure such accuracy, the unit’s carriage contains precision bores with special, fine-centering elements for the assembly of universal slides. In addition, linear guides are integrated into the units versus slide guides inside the mold frame. Servomold says placing these outside the mold frame enables more compact tools and reduces maintenance costs.

Typical applications for the cleanroom-compatible linear motion systems are sleeve-shaped parts, including medical housings and cartridge holders for applications like auto-injectors. All versions are suitable for mounting on both new and existing molds as a retrofit.

The SLY-S-150 core pull has a 150-mm stroke, with a 100-mm stroke for the SLY-S-100 and 75-mm for the SLY-S-075. Thrust of 6 kN is standard, and a retrofittable planetary gear box can double that value to 12 kN. Servomold says different slider bodies can be mounted on the carriage, enabling application-specific systems, while multistage movements can be tailored to a specific demolding process. Optional motor brakes securely hold the system in position in the event of a power failure.

All actuators are controlled via the Servo MoldControl (SMC), which includes a touchscreen and automatic switching between different encoder systems. Depending on the configuration, the system can control up to eight servo drives. Servomold products are distributed in the U.S. and Canada by DME.