Learn Castings: Cores & Coreboxes
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- Опубликовано: 27 ноя 2011
- Video explaining how cores and coreboxes work when making a mold and casting.
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I am starting to get more free time/money at the shop again so i will be making more videos over this. By the end of my casting series i hope to teach people how to make their own tooling using a 3D printer or home built CNC, which i will make a video of building a CNC also :). There is a lot to know and calculate for tooling so it will take some time to organize all the videos to my liking.
I appreciate your input, I'm really inspired by the workmanship and the time you take to explain everything .
Thank you for watching, getting feed back from people like you drive me to keep doing this. As much as i love doing this you can get burnt out on anything, simple comments can go a long way for motivation.
Just remember, if you ever end up making some tooling, send it our way so i can keep our green sand foundry running :). It's the slowest of our production lines right now and they are hurting for work.
Hi Garen, just wanted to say thanks for taking the time to make this series of videos.
I am just interested in casting Al from a hobby point of view as well as family history. My grandfather was a tool maker and his brother was a pattern maker so seeing inside these sorts of metal trades shops is of great interest.
Those are some beautiful castings. Nice smooth shop corners tight tolerances. It doesn't get much better.
Very informative, thank you for sharing this as there is not much info around. I'm with a miniature steam club and am making the patterns for the piston valve steam cylinders at the moment so your video is very helpful. I have to put cores in for the steam and exhaust passageways. I will be making Male core patterns then make female wax core boxes from them to make the sand cores. Keep up the good work.
I enjoy this I am a core maker. When I use my air set sand over oil sand when it's warmer outside the san sets up much faster but I can turn down the chemical agenda being dumped into the silica sand. The oil sand I put the cores into a core oven to bake out moisture. It's Art and I love my job
Thank you so much, your video was really helpful!
There are two kinds of metal shrink though, the first is over all shrink, which depends on your metal and pour temp, we pour around 1400F and see shrinkage around .100-.140 per foot 0.008-0.011%, sounds small but its not.
The second is hot spot shrinkage, this falls under entropy and thermodynamics. Hot and cold spots will pull metal away from one another creating 'shrink spots' within the metal, they are visible by the eye and are weak spots. These are controlled by risers/gating.
Using a chill should stop hot spots
the pattern shop i worked at did an intake for holley a few years ago. we mostly did larger stuff for roots blowers etc for the energy industry. howden roots was one of our customers. so was ariel compressors.
Very good information Garen. Appreciated 👍🏻👌🏻
Electric(induction) furnaces and gas furnaces will affect the impurities in the metal, which affects the quality of the casting. We use only electric furnaces except for our die cast shop.
For weight its just experience. We can look at a pattern and guess how much we need. We only pour 2-3 sizes of ladles and after the first pour you know how much to grab out of the furnaces for the rest. If your referring to risers/casting ratio though, it's safe to start at 60/40 ratio.
Informative, love it.
excellent overview!
Great Video!!
Great vid! Thx!
Excellent video.. Thank you
Great work
nice video . now i'd like to see you make something from start to finish with no gaps
From Carl W. - retired - Nice job for the time you had. BTW, "knock out" is also known as "shake out". Porosity should be reduced by gating.
great explanation
theres a fairly simple piece of mathematics used to determine this value, you can find the metal shrinkage values online, you then factor these values into the measurements of the item your making. for instance, ally has a shrinkage value of 2-3% from melting point, so you make allowances for this amount in the model, an added security measure is the use of risers, which allow the Mold to 'absorb' extra metal, to help reduce shrink spots etc.
hey i just got back from CastExpo in St Louis, google, "American Foundry Society", they have a bunch of books on foundry stuff, unfortunately they are going to run $50-200 per book.
yes it is
Im not sure what its called exactly without looking at the bottle, i know its silicon based. Just google "Sand Core Paste" and you should find something suitable.
I find it very hard to get literature on foundry work and mold making for sand. Its not like most trades, each foundry does things a little bit different. Most of this is due to, there is no right or wrong way to make castings, just better or worse. The only book I've read on foundry work is a book my father has that was written in the 50-60's. Your best bet to learn how to make better castings is to research thermodynamics, hydrodynamics, entropy, convection heat, induction, metal properties.
Very nice
Hi...awesome video . whats the mold made of ?
2-3% is way to much for aluminum, standard is 1/8th inch per foot(%1.04) but cores and part design heavily effects shrinkage.
Thanks for replying I've watched this video and others at least 10 times each. I have couple of questions how do you figure the metal thickness between mold/core and factor how much metal shrinks when cooled? Also can you point me to some good literature on this ?
THANKS, I believe the cost is worth it for the outcome.
Thanks!
Nice video
Okay I have a couple of questions as I was taking notes, In respect to metal casting how would I research ''induction'' ? How does it relate to pouring metal into a mold?
And how do you determine how much weight in liquid metal you need to pour?
What software is that in the corner? It looks so incredibly useful. I'm over here trying to simulate everything manually like a caveman
Holy crap, I was thinking the whole time this was some sort of industrial engine or something. Is it a supercharger???
yes it is.
What components did you use for making the core sand ?
@Garen Phillips What kind of glue is used for bonding cores together? ( Beginner/Learning)
Thanks.
thanks
NICE! I've been struggling a lot with making my model engine. I've heard about "core sand", but the chemical is so difficult to get hand of here "sodium silicate"? - right?
OK, I can get it thru the company I work for, but then its the pure Sodium Silicate... During moulding it is something special chemicals added, isn't it?
Best,
Arild Olsen
Norway
Na there is videos on youtube how to do it. just mix it into the sand and expose it to Co2 and it will cure. Or let it sit for a day or two and it will age cure.
Waterglass and co2
thanks for the correction, most of my knowledge is in CNC and manual turning.
is that solidworks?
NICE MAN ....GOOD WORK WILL YOU EXPLAIN AGAIN WITH CAD MODEL
I surely will send it your way! I rather have more Americans in work then someone outsourcing work to China.
Hi, I thought core sand was heated to give shape, urs too easy. Can u share what is this type of sand.
Its a no bake air setting sand it has a binder and a resin mixed together
thank you, you saved me, but i´m mexican so ....sorry i guess
chinese will do the same much cheaper
Get a haircut!
what a joke!