Meaning
The adjustment procedure for setting clamp and injection speeds without material in the mould provides a baseline metric for dry cycle calibration. Technicians establish this timing during initial machine commissioning to isolate mechanical velocity from melt viscosity effects. Hydraulic pressures and servo response limits dictate the parameters verified during this phase.
Velocity Drift
Actuator wear alters the baseline established during dry cycle calibration over extended production runs. Valve leakage causes hydraulic lag that lengthens actual carriage travel times compared to the factory reference values. Process engineers monitor these timing variances to detect hydraulic degradation before part short shots occur.
Tolerance Margin
Component specification requires stricter repeatability than virgin material rheology allows during high speed closure sequences. Regrind batches exhibit viscosity fluctuations that amplify the small timing errors hidden in dry cycle calibration data. Mould protection sensors rely on these precise velocity windows to prevent catastrophic platen collisions under load.
Thermal Correction
Ambient temperature shifts alter oil viscosity and distort the timing targets achieved through dry cycle calibration. Production floors experience seasonal temperature swings that change hydraulic fluid flow rates through proportional valves. Moulding operations compensate for these thermal shifts by updating machine controller offsets between production shifts.
