Greensand Casting: Difference between revisions
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= | =Basics= | ||
There are 2 main | *There are 2 main [[Sand Casting]] methods, which combined make up about 40% of all casting processes: Greensand and [[No-Bake Sand Casting]] | ||
*No-Bake uses Sand and a [[Thermoset]] Plastic Mixture of the relevant Plastic Precursors and Catalysts which cures around the sand, holding it in place, in a similar manner to [[Composite Materials]] | |||
*Greensand Casting Can Have Various Binders which will make it either: | |||
**Self-Hardening (Minor Overlap with [[No-Bake Sand Casting]] | |||
**[[Gas Hardening]] | |||
***An example is when [[Sodium silicate]] is used. Carbon Dioxide is used to "Cure" the mold after forming | |||
**Thermohardening | |||
**This Classification is from [https://en.wikipedia.org/wiki/Talk:Sand_casting#%22Types_of_molds%22 a Reference to a Book by a User Discussing this in the Sand Casting Wikipedia Page] | |||
=Technique= | =Technique= | ||
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=Greensand Formulas= | =Greensand Formulas= | ||
==Theory== | |||
*You Will Have: | |||
**[[Sand]] ( [[Grain Size]] , [[Sand Type]] , etc all have their effects) | |||
**Your Binder(s) | |||
***In terms of non-Sodium Silicate or [[No-Bake]] | |||
**Small Amounts of Additives for more Specialized Greensand Formulations | |||
***Reducing Agents | |||
***Cushioning Material / Insulating Agents | |||
*One here, includes oil and bentonite - [https://www.cnczone.com/forums/casting-metals/42892-oil-bonded-green-sand-recipe.html] | *One here, includes oil and bentonite - [https://www.cnczone.com/forums/casting-metals/42892-oil-bonded-green-sand-recipe.html] | ||
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*Sand + bentonite, mulled - [http://www.foundry101.com/archive.htm] | *Sand + bentonite, mulled - [http://www.foundry101.com/archive.htm] | ||
= | =Internal Links= | ||
*[[Open Source Metallurgy Construction Set]] | *[[Open Source Metallurgy Construction Set]] | ||
= | =External Links= | ||
*[https://en.wikipedia.org/wiki/Sand_casting#Green_sand Wikipedia Page on Greensand Casting] | *[https://en.wikipedia.org/wiki/Sand_casting#Green_sand Wikipedia Page on Greensand Casting] | ||
[[Category: Metalwork]] [[Category: Metal Casting]] | |||
Revision as of 21:54, 5 June 2023
Basics
- There are 2 main Sand Casting methods, which combined make up about 40% of all casting processes: Greensand and No-Bake Sand Casting
- No-Bake uses Sand and a Thermoset Plastic Mixture of the relevant Plastic Precursors and Catalysts which cures around the sand, holding it in place, in a similar manner to Composite Materials
- Greensand Casting Can Have Various Binders which will make it either:
- Self-Hardening (Minor Overlap with No-Bake Sand Casting
- Gas Hardening
- An example is when Sodium silicate is used. Carbon Dioxide is used to "Cure" the mold after forming
- Thermohardening
- This Classification is from a Reference to a Book by a User Discussing this in the Sand Casting Wikipedia Page
Technique
- Comprehensive diagram of all casting types - [1]. MIG Casting is not included. Binders can be clay, chemically setting binders, and polymerized oils (motor oil)
- Nobake (airset or precision sand) casting - use a binder with sand. [2]
- Types of binders - [3]
Greensand Sources
- K-bond- the open source oil sand - [4], hint from [5]. Another link to PDF of formula - [6]. See Definitive Article on K-Bond.
- Petrobond - good for novices - [7]
- Ebay - 5 lb - $20 - [8]
- More about oil-bonded sand formulas - [9]
Casting Companies
- Commercial airset sand casting - [10]
Greensand Formulas
Theory
- You Will Have:
- Sand ( Grain Size , Sand Type , etc all have their effects)
- Your Binder(s)
- In terms of non-Sodium Silicate or No-Bake
- Small Amounts of Additives for more Specialized Greensand Formulations
- Reducing Agents
- Cushioning Material / Insulating Agents
- One here, includes oil and bentonite - [11]