Examine the whole bore length with an industrial borescope to make sure the repaired surface is smooth and level and to check for any remaining burrs, scratches, or distortion.
Verify that the bore diameter tolerance and coaxiality deviation are <=0.05 mm by pushing a standard nylon "Go" gauge that matches the bore's nominal inner diameter smoothly and coaxially to the bottom of the bore without snagging or binding.
Check for Installation Compatibility Insert a new armoured sheath, making sure that it fits snugly and without any looseness between the outer wall of the sheath and the inner wall of the bore, and that it is easy to insert and remove without binding.
Verify that the insulation resistance between the housing and the thermocouple poles (within the sheath) is >=100 MΩ and that there is no chance of electrical leakage.
Checking the Performance of Temperature Sensing After heating the hot runner to the specified working temperature and keeping it there for half an hour, check the readings using a calibrated standard contact thermometer to make sure the difference between the temperature controller display and the actual measured temperature is 1℃.
To ensure that there is no unidirectional, continuous drift in the temperature signal, start the PID auto-tuning of the Husky temperature controller to finish single-point calibration and update compensating settings.
Check for Operational Stability Conduct three consecutive cycles of heating and cooling (from room temperature to the maximum working temperature) while keeping an eye on the temperature curve. Verify that the temperature uniformity deviation is <=±1.5℃ and that the temperature fluctuation is <=±0.5℃ with no random spikes. After all requirements are satisfied, regular manufacturing may start up again.
This inspection procedure ensures that the temperature-sensing bore's repair precision satisfies requirements, eliminating injection moulding flaws brought on by bringing a malfunctioning system into production. It is completely in line with on-site hot runner maintenance and operating situations.
