Love Casting

http://magegame.ru/?rf=6972756e6b615f37

I made a mask.
haha

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Im revising the process for a product design exam, there is just one bit I dont get.
You have each sides of the moulds on seperate boards, and you have put "green sand" (whats that??) and recycled sand around them.
You then take away the moulds and fixs the two halves together, one has a runner and rinser.
I don’t understand how the sand stays in shape after you have taken away the mould,,, would’nt it collapse? or is green sand special stuff that glues to itself into the shape?
Sos, i ment, put sand around the original pattern that you start with, made from wood, metal, whatever..

sand casting is the mold

Sand Casting: Introduction
Sand Casting is a process by which molten metal is poured in sand molds to … Sand casting is used to make large parts (typically Iron, but also Bronze, Brass, …
www.efunda.com/processes/metal_processing/sand_casting_intro.cfm – Cached

CO2 is used to *Freeze* the green sand to a rigid form.
A cast part made from a green sand mold has low tolerance and the parts are repeatable.

This process is labor intensive and costly, but the process yields excellent parts. Typically, this process is used for low production runs. The Process is best used with casting grade Aluminum alloy with subsequent heat treatment and straitening.

The problem with any sand casting can be porosity and voids. So, the process gets refined for each shape and configuration of a part…..cooling, venting.

see the following link:

http://www.sandcastingmix.com/

Sandy

Precision Airset Sandcasting process for aluminum castings at Armstrong Mold Corp. East Syracuse, NY

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What differences, if any, would you expect in the properties of these 2 methods of casting?

permanent mold cannot take very high temperatures so is used for low temp melt metals only. aluminum, zinc, magnieseium etc. sand is a refractory and can take high temps,steel, iron, stainless etc.

permanent molds are very expensive, sand molds are relatively cheap and quick

permanent molds are quite accurate, sand molds not so much.

permanent molds require draft and sometimes complex folding parts to be able to withdraw from the interior. sand is simply shaken out.

Demonstrated by Yeongchi Wu, MD;
Co-Editing: Josh Waller;
Editing and Technical Assistance: Kate Jackson.

A full demonstration of the CIR Sand Casting System. The process offers a low-cost, high-quality alternative to traditional prosthetic fabrication methods.

The contents of this presentation/publication were developed under a grant from the Department of Education, National Institute on Disability and Rehabilitation Research grant number H133E980031. However, those contents do not necessarily represent the policy of the Department of Education, and you should not assume endorsement by the Federal Government.

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mass production

Sand casting allows higher temps casting for certain high temp alloys or steel that would fail in a diecast….so sand cast usually means a better product.

drainss

PART THREE – Sand Casting Process with Philip White and Jenny Dunseath in the foundry at Camberwell college of Art London. Video by Chris Follows part of the Process Arts Project – http://itrdu1.arts.ac.uk/wpmu/process – University of the arts London

Text Information supplied by Jenny Dunseath:

11. Take Cope off and set it aside. You should be able to see an imprint of your Pattern. Depending on its location use your hole-cutter and cut a Sprue hole by placing your hand on the back of the Cope and push hole cutter through the other side, twisting slightly.
12. Widen the Sprue hole on the top of the Cope, to enable the metal to flow. Ensure all edges are smoothed and there is no loose sand.
13. Tap on the Pattern to loosen, use a screw to take Pattern out.

14. With a set of Bellows blow out all loose sand, make sure everything is smooth.
15. Place your flask back together and pour your metal!
16. After pouring wait for the material to solidify. The amount of time this takes will depend on the size and density of the piece of metal you are creating. Large, dense pieces of metal will take more time to solidify than smaller pieces.

Duration : 0:6:28

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