Filling process not finished. What is the reason?

lance.xi — Sun, 24 May 2020 10:42:31 GMT

I set injection time 12s. The calculation stopped at 8.5s, and I found the filling process has not been completed.

How to solve this issue?

Please help.

Thanks!

Re: Filling process not finished. What is the reason?

lance.xi — Mon, 25 May 2020 09:38:12 GMT

Please see the analysis log as attached.

Please help!

Re: Filling process not finished. What is the reason?

bernor_mf — Mon, 25 May 2020 12:03:49 GMT

Hi @lance.xi ,
as seen in provided information there is a short shot.
The cavity cannot be filled in the current circumstances, process settings.
I assume this is Reactive Molding process, with filling and packing control, right?

What happens is that it reaches maximum injection pressure (not sure what it is set to, but default is 180MPa).
It then switches to use maximum pressure. (the limit could be pressure or clamp force)
This pressure is too low to fill cavity.
The flow front hesitates, and cures, and causes the short shot.

So process conditions and/or part design to be changed.
- check advanced options: what is the limit of injection molding machine : hydraulic unit and clamping unit.
Is it sufficient for the part design?
- what does clamp force result look like? peak pressure, spike clamp force
- what does injection pressure profile result look like? a spike?
- faster fill? Maybe set injection time is too slow?
- Any reason for curing happen too soon?

Not so easy to have a clear cut of the underlying reason for the short shot.

But first I would check the filling time, if it is too long, and causing the issue.

This could probably be done on a simplified part geometry, to investigate a descent molding window,

and process conditions.

Hope this helps somewhat.
Regards,
Berndt

Re: Filling process not finished. What is the reason?

lance.xi — Tue, 26 May 2020 01:43:16 GMT

Dear Berndt,

Thanks for your explanation. It is more clear to me now.

I will try to set short injection time and simplify the model at the same time.

Thx

topic Re: Filling process not finished. What is the reason? in Moldflow Insight Forum

Filling process not finished. What is the reason?

Re: Filling process not finished. What is the reason?

Re: Filling process not finished. What is the reason?

Re: Filling process not finished. What is the reason?