Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Stubborn gas defect
- Thread starter Kipara12
- Start date
where, and in what direction is the sprue relative to the defect? Can you add sprues?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
- Thread starter
- #3
Unfortunately i cannot share sprue runner and gating design due to confidentiality constraints but i can share that the sprue is 135 degrees clockwise from the defect, the ingate is 180 degrees to defect location. Pattern is 5 on so long runners to go around center cavity.
EdStainless
Materials
Are there vents in mold?
Looks like you need to add some.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
Looks like you need to add some.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
- Thread starter
- #5
Yes the mold has vents. So far i have tried to contain turbulence by controlling the shock transferred to the mold flasks as they shuttle down the pourline. This reduced the scrap rate from 16% to current 8%. Any ideas on other factors i should look into?
EdStainless
Materials
What about inlet turbulence in the pour?
Can the cup and sprue be altered to help that?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
Can the cup and sprue be altered to help that?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
- Thread starter
- #7
Ran a trial with a wider pour cup in an attempt to control pour times and head pressure with minimal to no effect. Planning thinner cross sectional area ingate trial based on EdStainless suggestion. Hope to see some improvement. I believe @ EdStainless your rational is a less turbulance into the cavity faster freeze time for the gates with a smaller cross section, correct?
- Status
Similar threads
- Locked
- Question