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15th February 2022, 04:00 PM
#8
Re: ID shrinkage observed on Brass Metal Insert (C3604) after plastic injection over Moulding
Hi Curious,
Without observing the entire process, I could not hazard a guess as to how accurate those holding pressures are. Generally speaking you should have done a cycle optimization when you started running this initially. There are a lot of you tube videos on processing. Current logic is that you fill to about 90-95% on primary and finish filling and pack for dimensional stability on hold, but you should do the math with some Rheology curves to get the best process (Cycle Optimization). Otherwise if your ID finish requirements are not to bad, you could just drill the finished product to size in a secondary op.
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