I. Visual Positioning Method for Short Shots
Pre-set the injection stroke to 70% to 80% of the total filling stroke, 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, which is evidently behind the other cavities, is the one with a sluggish filling rate.
This method is the most frequently employed rapid positioning method in small-batch production scenarios, as it takes no more than 5 minutes, requires only 1 to 2 test shots, and has no inspection cost.
II. Method for Positioning the Cavity Pressure Curve
Connect a low-cost external pressure sensing patch to each cavity in order 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. Cavities with filling times that are notably delayed are those that are filled slowly.
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 mould 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.
Standard weighing tools are the only tools necessary; 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. Melt overflow in the venting grooves will be minimal in cavities with slow filling.
The trapped air and scorching marks in the slow-filling cavity will be substantially heavier than in other cavities after filling. This attribute can also be employed to rapidly identify the target cavity.
This approach is optimal for the execution of your small-batch hot runner multi-cavity mould production scenario. It does not necessitate a substantial hardware investment and can rapidly and precisely identify cavities with sluggish filling, thereby substantially reducing the setup time.
