I. Short-Shot Rapid Qualitative Verification: Perform one short-shot test at 70%~80% stroke, remove the partially filled semi-finished product, and compare the filling length of all cavities.
For cavities that were originally slow-filling, if the deviation in filling length from other cavities is ≤2%, it can be preliminarily determined that the filling lag issue has been repaired.
This method requires only 1~2 test shots, takes no more than 5 minutes, has zero testing cost, and is the most commonly used rapid verification method on-site.
II. Product Weight Consistency Verification: Continuously sample 20 complete molds and weigh each cavity individually using a standard electronic scale with an accuracy of 0.01g.
If the weight of the cavity that was originally slow-filling deviates from the average weight of other cavities by ≤1.5%, and the coefficient of variation (CV) of the entire batch is ≤2%, it can be determined that the filling uniformity has met the standard.
No precision testing equipment is required; full verification can be completed within 10 minutes, suitable for small-batch production scenarios.
III. Quantitative Verification of Cavity Pressure Curves
Using an external pressure detection patch, the filling stage pressure curves of each cavity are collected after repair.
For cavities with slower original filling, a filling time difference ∆t ≤ 0.03s (for small precision products), a peak filling pressure difference < 5%, and a pressure curve overlap with other cavities ≥ 95% indicate that the filling synchronization is fully met.
Positioning accuracy can reach 0.01s level, suitable for the precision verification needs of high-precision multi-cavity molds.
IV. Long-Term Mass Production Stability Verification
After 1-2 hours of continuous production, 50 mold products are sampled and inspected. A full visual inspection confirms that the cavities with slower original filling have no differential defects such as missing material, shrinkage marks, or burning.
Key assembly dimension deviations are controlled within 1/3 of the product tolerance zone, and mechanical property fluctuations are ≤ 5%. This indicates long-term stability of the repair effect, allowing direct transition to full-load production.
This verification method is perfectly suited to the hot runner multi-cavity mold production scenario you are maintaining. It can accurately determine the repair effect of cavities with slow filling without the need for large investments in testing equipment, thus avoiding incomplete repairs that could lead to filling imbalance failures during mass production.
