Abstract
Injection molding machines typically use hydraulic or electric systems, the selection of which depends on the performance, energy saving, investment cost, etc. Although hydraulic systems have the major disadvantage that they are less energy-efficient, it is well known that they have the advantage of high response and high thrust required for the control of pressurization and pressure holding. This paper introduces a control system and an AC servo motor driven hydraulic pump that are full-hydraulic and can achieve higher energy saving efficiency and performance. It also reports the current market trend toward the application of the system in Japan and overseas.
