Heat the hot runner to the current product's standard operating temperature for single-point temperature accuracy calibration. Once the temperature has stabilised for half an hour, make direct contact with the zone's reference temperature-sensing surface using a calibrated, high-precision standard contact thermometer. To execute single-point temperature compensation, enter the measured standard temperature value into the calibration menu of the Husky temperature controller. Make sure that the difference between the controller's reported value and the actual temperature is ≤±1°C.
Calibration of PID parameter auto-tuning
Turn on the PID auto-tuning feature of the temperature controller. This enables the system to automatically determine the proper heating/cooling response settings by capturing the heat transfer characteristics of the repaired temperature sensing port. This ensures a consistent temperature curve with little swings by removing temperature oscillation and overshoot brought on by mismatches between the old parameters and the new temperature sensor circuit.
Multi-zone temperature uniformity calibration Gather real temperature data from all nozzle and manifold zones at the same time using multi-channel standard thermocouples. To avoid significant localised temperature fluctuations that might jeopardise moulding consistency in multi-cavity products, adjust the temperature compensation offset for each zone so that the temperature uniformity deviation across all zones is ≤±1.5°C.
Verification of the calibration of the heating and cooling cycle
Conduct three consecutive cycles of heating and cooling, starting at room temperature and ending at the highest working temperature. Throughout the procedure, keep an eye on temperature data to make sure that readings are consistent throughout all zones and that there is no drift or rebound in calibration deviation following each cycle. Once verified, the calibration procedure is finished and the system is prepared for manufacturing.
This calibration process completely complies with precision hot runner injection molding's temperature control specifications, successfully averting moulding flaws brought on by inaccurate temperature sensing after repairs.
