New Production Cell for Miniature Parts
At the K2010, Maenner exhibited a newly developed production cell for injection molding miniature parts. The injection and clamping units of the machine are all-electric and powered by torque motors. Since there are no gearboxes, efficiency and processing accuracy are increased. At the same time, wear and maintenance requirements are reduced. The two-stage injection unit with screw preplastizing and plunger injection ensures a short residence time for the resin, and in this way achieves fast cycle times. The injection unit can process commercially available pellets and provides an injection pressure of up to 3,000 bar.
During the production process, several mold halves are employed. The variotherm process and part removal take place outside the clamping unit. The moving mold halves are transported from the clamping unit to the individual function stations by linear units attached along the machine. At the corners, the mold halves are reoriented by pneumatic rotary actuators.
Following injection, the moving mold halves, together with the molded parts, are repositioned for cooling. Contact cooling is water-based. There are two ejection stations – one for the sprue/runner and one for the molded parts. The mold ultimately returns to the heating station and then injection. Several processes occur simultaneously within the system, thus achieving a fast cycle time. By employing several mold halves, it is possible to produce parts with different geometries without changing the machine setup. This helps to reduce the manufacturing costs for short production runs in particular.