ENERGY MANAGEMENT | TECHNOLOGY
IMAGE: LS MTRON
The ONE*-E series of fully electric injection moulding machines from LS Mtron use low inertia servo motor for 20 ms acceleration/ deceleration speeds
platen design allow for larger moulds to be run on smaller sized units. LS Mtron, a South Korean injection moulding machine supplier, this year launched its high-per- formance all-electric ONE*-E series line of toggle injection presses made for high cycling, precise moulding applications such as medical devices or rigid packaging. Offered in ten models with clamping tonnages
from 33 to 440 tons the ONE*-E line complements the WIZ-E series of fully electric machines as well as its ONE*-E series of hybrid machines, according to Peter Gardner, Business Director at the company’s Duluth, GA subsidiary, LS Injection Molding Machine North America. The parent company purchased the plastics machinery division of Daiichi Jitsugyo America (DJA), Wood Dale, IL, in 2018, which distributed injection machines from LS Mtron and from Japanese machine maker Niigata. Features of the new line include a one-piece, high rigidity casting structure for the injection unit, low-inertia servo motors that deliver injection speeds up to 300 mm/s, with acceleration/decel- eration speeds of 20 ms for improved reproducibil- ity. The improved fast charging plasticising screw manages increased screw RPMs. The injection unit moves on a low friction LM guide rather than a bush guide system for repeatable acceleration and precise control. Servo encoder resolution for the injection step
was increased in the ONE*-E models compared to the WIZ-E full electric model by improving the drive
control frequency response nearly fourfold for controlled, high-speed servo injection. The unit can handle increased injection pressures between 270-350 kg/cm2
. At the same time, a KEBA controller received an
upgrade from a single core processor to a dual core CPU for faster scan times. The company also added an energy monitoring system to the injection unit to determine the power usage during movement of the main axis. Energy usage per shot, shot volume, production and sum production can be determined from the power meter. Energy monitoring can check for moulding condition changes in real time based on energy consump- tion, giving insight to process adjustments and a way to minimise energy consumption. The updated design of high-speed toggle reduces dry-cycle times 35-40% compared to standard models. Clamp open/close speed was updated to register a 45-50% improvement compared to a standard unit. The centre press fixed platen is designed to deliver a more uniform mould surface pressure which extends the life of the mould. A minimum clamp force software program uses a sensor to detect clamping force on the tie bars, and measures the load received from the mould during moulding, automatically calculating the minimum power requirements to reduce the load on the mould and driving unit, says Gardner. The company says future energy-focused developments include implementation of regen- erative power devices outfitted with a regenerative
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