I. Visual Positioning Method for Short Shots
Set the injection stroke to 70% to 80% of the total filling stroke in advance, execute a short shot, and remove the partially filled semi-finished product.
Directly compare the extent of the filling in all cavities. The cavity with the shortest filling length is the one that is filling at a slower pace, as it is plainly lagging behind the other cavities.
This approach necessitates only one to two test shots, requires no more than five minutes, and incurs no inspection expenses. It is the most frequently employed rapid positioning method in small-batch production scenarios.
II. Method for Positioning the Cavity Pressure Curve
Connect a low-cost external pressure detection patch to each cavity to collect the pressure curve of each cavity in real time during the filling stage.
Compare the peak pressure arrival time and the commencement of filling for each cavity's pressure curve. The cavity that fills slowly is the one with a significant time lapse.
The rapid troubleshooting requirements of high-precision multi-cavity moulds are well-suited to the positioning accuracy of 0.01s.
III. Method for Reversing Product Weight Positioning
Continuously sample 10-20 complete moulded products and weigh each cavity individually using a standard electronic scale.
Those cavities with slow filling are those with significantly lower weights than the average weight of other cavities. The lagging cavity in mass production can be directly identified using this method.
Conventional weighing instruments are the sole prerequisite; no modifications to the mould structure are necessary. This approach is appropriate for promptly resolving unanticipated filling imbalances that occur during mass production.
IV. Auxiliary Positioning Method for Venting Status
The overflow status of the venting channels in each cavity on the mould parting surface should be observed. The venting grooves exhibit virtually no melt overflow in cavities with sluggish filling.
The confined air and scorching marks in the slow-filling cavities will be significantly heavier than in other cavities after filling. This attribute can also be employed to rapidly identify the target cavity.
