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Green Sand Metalcasting Foundry News

"V" - Glossary of Foundry Additives (Including Vegetable Core Oils)

Posted by Hill and Griffith Company on Aug 21, 2018 3:51:12 PM

V - Foundry Additives Glossary

VEGETABLE OILS (See: CORE OIL-COTTONSEED OIL-LIN­SEED OIL-OILS-TUNG OIL)
These are oils obtained from plants. They are used in the foundry as drying oils, as lubricants, and for other purposes. Examples of vegetable oils are linseed oil, cottonseed oil, olive oil, palm oil, and castor oil. The chief distinction between vegetable oils and fats is physical. Oils are fluid at ordinary temperatures. Vegetable oils can be thickened by oxidation, or more simply by blowing air through them. They may be hydrogenated by passing hydrogen gas through them. in the presence of a catalyst. Foundry oils contain a large quantity of the vegetable oils sold.

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Additives Glossary, Green Sand Additive Products, Green Sand Foundry Supplies, Core Oil

"U" - Glossary of Foundry Additives (Including Core Binders)

Posted by Hill and Griffith Company on Aug 14, 2018 12:59:00 PM

U - Foundry Additives Glossary

UFFA TYPE RESINS (See: HOT BOX RESINS-RESINS)
Are resins of a special type commonly used as binders having different setting times, cold-set strengths, hot cured strengths and setting properties.

UNMODIFIED UREA FORMALDEHYDE (See: RESINS-UREA) 
Unmodified UF resins, catalyzed, are difficult to control in setting time when used as cold-set resins. Their cold-set strength is medium, but they have a high hot-cured strength. They have poor setting properties and are sensitive to mold-metal reactions, unless a proper coating is given the sand surface.

UREA BINDER (See: LIQUID UREA BINDER)

UREA FORMALDEHYDE CATALYZED (See: UREA RESIN) 
When urea resins are catalyzed, they start to cure immediately when used. This can be a bench life problem. The higher the temperature, the faster the curing process.

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Additives Glossary, Green Sand Additive Products, Green Sand Foundry Supplies

"N" - Glossary of Foundry Additives (including Core Binders)

Posted by Hill and Griffith Company on May 15, 2018 3:26:40 PM

N - Foundry Additives Glossary

NAPHTHALENE
Is also known as "NAPHTHALIN"-"WHITE TAR" or "TAR CAMPHOR." Its chemical composition is [C10H8J. Its molecular weight is 128.2. It has the odor of mothballs and is derived from coal tar where it is the most abundant single constituent. It is crystallized from the middle or "carbolic oil" fraction of the distilled tar. It is con­tained in a few liquid sprays used in the foundry, such as certain liquid partings.

NATURAL ROSIN (See: BINDERS-BONDS-PINE RESIN-RES­INS-ROSIN-TRULINE BINDER)
A hard resin left after distilling-off the volatile oil of turpentine. It generally has a higher melting point than other resins. The natural resins are used as supporting sand core binders in making heavy cores or molds which require baking. Resins work best with higher temper water levels in a foundry sand mixture. They also work best where clay is used in the sand mixture. Rosin is blended into core oil and enhances core mixtures which contain cereal, dextrin, lignin sulphite and other water soluble additives.

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Additives Glossary, Green Sand Additive Products, Green Sand Foundry Supplies

Environmentally Friendly Sodium Silicate Binders

Posted by Hill and Griffith Company on Nov 7, 2017 9:33:12 PM

Corosil (Silicate Products) - Application to Aluminum Castings Sodium Silicate based products are one of the most environmentally friendly products that can be used in a core room.

The Indianapolis Manufacturing Facility has an excellent product line of Sodium Silicate Binders (Corosil and COBond). There have always been problems associated with the application of sodium silicate binders. The principal problem is in their inability to "shakeout" of a casting. The term "shakeout" applies to the ability or inability to remove the bonded sand from the solidified casting. As everyone would appreciate, if a foundry cannot remove the sand from the casting easily their costs of producing the casting would increase. In comparison, the less environmentally friendly processes do not have the severe difficulty of "shakeout".

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Release Agents, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Core Coating, Core Adhesive

Selecting A Core Adhesive For A Shell Core

Posted by Hill and Griffith Company on Nov 1, 2017 1:26:40 PM

It is extremely important to select the correct adhesive to receive the maximum efficiency out of the selected product.

There are a number of adhesive applications that must be considered. A shell core may employ an adhesive immediately after the core is removed from the box (the core will be extremely hot and this is not the preferred time to apply an adhesive), the core may be "warm to the touch" and when the core is sufficiently cool. It is important to realize that there is not a single adhesive for all of these applications.

When a shell core is extremely hot it is very difficult to apply an adhesive that will create a sufficient bond to maintain the strength at the joint of the core. The only adhesive that will meet this application is a water based core adhesive that is designed for "thermal curing" (oven curing). The product that we recommend for this application is Red Chief. However, it very important to realize that this is not the best application time for any core adhesive.

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Release Agents, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Core Coating, Core Adhesive

Forget Southern! Go Western Bentonite Green Sand Binders

Posted by Hill and Griffith Company on Oct 3, 2017 6:30:55 PM

• This article explores the feasibility of using a predominantly Western Bentonite preblend in place of the traditional Southern and Western Bentonite binder makeup.

• By using a Western Bentonite - dominated binder, overall bond usage by a foundry can be reduced with an increase in mold hardness.

• Some of the questions a foundry would ask about converting to this Western - dominated binder are answered to provide practical guidance to foundries considering a switch.

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Release Agents, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Core Coating

Foundry Core Coating Applications for 3D Cores

Posted by Hill and Griffith Company on Sep 27, 2017 4:04:51 PM

MODERN CASTING Magazine Webinar, "Combining Cores With 3-D Printing--Pay Now or Pay Later."

"Combining four individual cores into a single piece can have a huge impact on downstream costs. It is often difficult to determine what “not having” 3-D printing can cost. In this webinar, a metalcaster will share a real world example of how progressive thinking can save money downstream. 

Since 1936, Prospect Foundry has been a market leading supplier of complex cored gray and ductile iron castings in low to medium volumes. It combines modern casting technologies, engineering expertise and a focus on craftsmanship to produce high quality, complex pressure tight, porosity free castings. Prospect Foundry castings have been used by major OEM customers in the construction, mining, agricultural equipment and industrial markets."

Here's a transcript of the presentation that includes comments on foundry core coating application, pastes, patches and washes. Enjoy!

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Tags: Metal Casting, Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Release Agents, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Core Binders, Foundry Core Coating

News from Sales & Operations - Green Sand Technical Support

Posted by Hill and Griffith Company on Sep 19, 2017 2:20:18 PM

New Technical Representatives and Mike Lawry's appointment to Vice President of Sales and Operations

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Release Agents, Foundry Supplies, Green Sand System, Green Sand Metalcasting, Core Binders, Green Sand Technical Support

Mold Coatings and Core Binders for the Green Sand Metalcasting Foundry

Posted by Hill and Griffith Company on Sep 12, 2017 2:06:16 PM

Core & Mold Coatings

EZ Kote™ Refractory Core & Mold coatings are formulated for ferrous & non-ferrous castings. The formulation permits use on small intricate cores up to heavy cores and molds.

Emulsified Core Binders

Hill and Griffith 523 and 683 Emulsified Core Binders are formulated with water, drying type oils, surfactants, cross-linking resins, hardeners and biocides to produce a stable emulsion used in making sand shapes. 523 and 683 Emulsified Core Binders were developed to meet increasing environmental demands set forth by the Environmental Protection Agency.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Release Agents, Foundry Supplies, Green Sand System, Green Sand Metalcasting, Core Binders

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