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Hanking Mould_How to verify injection mould?

2017-11-14

Have you ever been encountered the appearance issues while mass production?
It is the trouble thing for us, which cost a lot of time and money to repair...
The Molding parameter window is NARROW? want a ROBUST process parameter?

Tool Spotting
Action is okay? EPs, lifters and Sliders system run smoothly?
PL spotting, Slider and its pocket, Lifter with good spotting?
Pressure Pads with good spotting?
Good Polishing? No any EDM mark on PL or action surface?

Injection Speed
How to get the right SPEED?
Mould 1 part at 95% injection speed and record actual fill time in table above
Continue reducing speed until lower limt is reached or injection stalls; record time for each
Choose an appropriate time scale and plot speed vs. time

Filling Balance
Cavity Filling Balance?
Mould 3 consecutive visually "full" shots. Weigh each cavity and calcuate the average for each. Choose an appropriate weight scale and plot the average
Adjust the transfer position to make parts that are visually "85%" full. If there is an imbalance in the cavities make the larger part "85%" full and keep them for weighing.

Pressure Drop
Pressure Drop( Where is the Bottle neck)?
Set the injection pressure to the maximum available pressure for the machine.
Adjust transfer position to obtain shots at the locations specified in the table above.
Record the pressure required and calculate the percent of the total available pressure

Gate Seal
Set cooling time to a value that permits part ejection and set hold time to 0; mould 8 shots to stabilize process.
Starting at 1s of hold time, mould a shot then increase hold by 1s
And repeat at longer hold times. Weigh the shots and plot above.