Power Jacks Rolaram Linear Actuators - Manual (Page 6)

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LINEAR ACTUATORS | Rolaram
2. Working Applications for Rolaram® Actuators
Application
Die splitter for opening up 20 tonne die sets, prior to their use in the
production of car body panels.
Linear Actuation Requirements
Dies require to be split evenly, with all corners being moved simultaneously, within 5 microns of each
other.
Solution
4 identical Rolaram actuators mounted one on each corner of the die splitter. Each driven by a servo
motor, controlled by a PLC, to ensure synchronisation of all 4 actuators, within the required limits of
positional accuracy. Cranes were previously used to split the dies and the die splitter now represents a
considerable time saving in preparing dies for production.
Application
European Community funded research project, to monitor the steering roll characteristics on a
zincplating line for steel strip. The aim is to optimise downtime and repairs on the line.
Linear Actuation Requirements
5 axis control of the steering roll (X, Y, Z and tilt), to a repeatable positional accuracy of less than 10
microns.
Solution
5 Rolaram actuators, each driven by an AC synchronous servo motor, controlled by a Programmable
Multi Axis Control System. The units are fitted with an incremental encoder, a load cell and backlash
free gimble mounting.
Operating
Moving a maximum load of 270kg at a maximum acceleration of 1 metre/second2 and a maximum speed
of Characteristics 0.5 metre/second, to a repeatable accuracy of less than 10 microns.
Application
Grinding head adjustment to put precise tapers on camshaft cam lobes.
Linear Actuation Requirements
Moving a load of 270kg, on a continuous duty cycle, over an operating life of 10 years.
Solution
A single Rolaram actuator fitted with an AC servo motor and encoder.
Unit is sealed to prevent the ingress of abrasive dust.
Application
De-chocking car for removal and refitting of 14 tonne bearing assemblies
(chocks) on steel rolls.
Linear Actuation Requirements
4 stage sequence of operation
• Locate car on its rails, parallel to and exactly on centre line of bearing assembly.
• High speed traverse drive to place lift platform under bearing assembly.
• Raise lift platform to sense load of 14 tonne bearing assembly, then
move 75 microns to locate centrally around tapered shaft of steel roll.
• Drive platform traverse to clear bearing assembly from shaft (slow speed) then safely locate bearing
assembly on car (high speed). A hydraulic solution was unable to satisfy the above requirements.
Solution
A total of 2 Rolaram actuators and 6 Spiracon roller screws, to provide a combination of high speed
(up to 45 metres/minute), very slow speed and micron accuracy. Since the de-chocking car has been
installed, the time required to prepare rolls for changing at the mill stands has been reduced by up to
50%.