Abstract: Based on the graphical programming language of LabVIEW, an energy consumption detection system for injection molding machine was developed, which could make on-line detection for the energy consumption of the hydraulic system in the injection molding machine. With on-line integral method, the whole energy consumption of the machine and the energy distribution of different processes stage in an injection molding cycle could be detected. An experimental study on energy distribution by this system was carried out in order to find the influence between the key process parameter and the energy distribution. It was found that the major stage in this energy distribution was injection process. The major effect of injection pressure on energy consumption was in the stage of injection energy consumption, but the major effect of screw rotational speed on energy consumption was in the stage of plasticization energy consumption.

Key words: plastic injection molding machine, virtual instrument technology, on-line detection, energy distribution