Product category:
Injection moulding
News Release from: Tolomatic | Subject: Linear actuator - valve gate control
Edited by the Manufacturingtalk Editorial
Team on 09 September 2005
Linear actuator improves moulding
quality
Linear actuator provides complete and precise electrical control of every injection moulding machine axis, including valve gate control and improves the quality of large or complex parts.
Tol-O-Matic has announced the ServoGate - a new, patent-pending electric servo actuator designed for valve gate control applications, in particular those in injection molding applications The ServoGate actuator is the first compact, high performance electric actuator developed specifically to replace the bulky hydraulic valve manifolds and hydraulic power systems used for valve gate control and sequencing
This article was originally published on Manufacturingtalk on 21 Feb 2008 at 8.00am (UK)
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By eliminating a number of variables found in fluid power systems, such as fluid bulk modulus and viscosity changes, the ServoGate actuator delivers precise gate control in a compact package measuring less than 7.0in X 7.0in (17.8cm X 17.8cm).
"For years, veterans of hot runner molding technology have looked for the perfect valve gate".
"ServoGate's all-electric solution improves shot accuracy and repeatability of injection molded parts, regardless of whether it is applied to a standard or all-electric injection press," said Gary Rosengren, director of engineering.
"The ServoGate actuator also offers significantly extended service life, zero maintenance and improved throughput - while eliminating the environmental costs and hazards of dealing with hydraulic fluids." Rosengren added that ServoGate is a completely integrated design - a major departure from belt coupled, reverse parallel (RP) designs with separate motor and actuator components.
Tol-O-Matic's Axiom Plus PV brushless servo controller/drive controls the ServoGate linear actuator.
A threaded rod connected to the valve gate passes through the hollow shaft of the actuator, precisely positioning the gate with speed and precision repeatability over millions of cycles.
ServoGate offers continuous force of 500 pounds, and features less than 0.5 second cycle times for 0.75in extension to the 500 lb seat and retraction.
The system is water cooled to operate with peak performance at 400 deg F.
Nominal length and diameter is less than 7.0in X 7.0in including water jacket, with a standard stroke of 0.5in (other strokes are available on request).
ServoGate includes easy-to-use, Windows based Tol-O-Motion software that offers simple point-and-click sequential programming for the valve gate control requirements of different parts.
A PLC ladder logic editor provides a familiar programming environment, with no need to learn new code.
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