17 September 2019
The increasingly urgent demand for precision in the injection molded transmission parts leads to the optimization of all the variables involved in the entire process chain. The choice of the type of press receives full credit. Responding to these needs, we recently introduced full-electric presses in our fleet, which are gradually replacing hydraulic or hybrid models. This is due to the same advantages they offer and which concern:
Stagnoli innovates and updates itself with the new full-electric TOSHIBA EC75SX press, the latest generation machinery used in different areas, including the construction of transmission parts.
Full-electric presses have technical characteristics and distinctive features that can offer various advantages in the production of injection-molded items and, in particular, of those technical items that require high precision, such as thermoplastic transmission parts. First and foremost they guarantee greater precision and repeatability in processing, thanks to the introduction of numerical control systems (CNC). This results into the fact that the process of electric presses is totally repeatable and does not require a particular assembly to meet the required specifications.
The diagrams below show a statistical comparison prepared by Stagnoli concerning the production of the same item printed on an electric press and on a hybrid press. It is noted that not only the range of error deviation compared to the average calculated on a number of 20 samples, after three hours of production, is more restricted if the item is produced on the electric press rather than on the hybrid one, but also that the extent of the measurements oscillation is smaller; all this indicates the greater precision of the electric press.
Another advantage guaranteed by the full-electric presses is the decrease in the process cycle time: thanks to the constant check of each positioning and to the accurate control of the screw feed and pressure, it is possible to improve the process that allows reducing the time of each stage. This allows a general decrease of the total production time.
Finally, energy saving is a feature that should not be underestimated: the full-electric presses require maximum power supplied only in the opening and closing phases of the mold and in the injection phase. Instead, energy consumption is practically zero in the other maintenance sequences. This differs from what happens in the case of the same machine powered by a hydraulic system: the oil used to transmit the energy must always work at maximum pressure, so the entire hydraulic circuit is always fed by the motor's maximum consumption of electric power. This means that in a hydraulic press the power supplied is always maximum while in an electric press the average power supplied is around 50% less.
After carefully assessing all these features, Stagnoli has decided to renew its fleet over time by introducing the new full-electric press. Contact us for more information.