A range of sensors and high resolution data acquisition system has been installed on a Wittmann Battenfeld MicroPower microinjection moulding machine to study the dynamics of the injection and hold phases. The results found that while the velocity control was good, there was an overshoot of pressure for higher injection velocities caused by the time required for the injection unit to decelerate. There were also some differences between the position recorded by the machine and the actual injection plunger position during the hold phase, caused by elastic deformation of the drive belts under the applied load. These deviations from set parameters will be even more significant when using conventional machines for micromoulding processes due to the increased inertia and lower response times of the injection units, and should be considered when performing moulding studies.
展开▼
