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1085 Summer Street - Cincinnati, OH 45204
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Green Sand Metalcasting Foundry News

Green Sand Foundry Vein Reduction

Posted by Hill and Griffith Company on Oct 17, 2017 5:18:52 PM

Reducing Surface Defects With Proper Vein Reduction

While green sand foundry vein reduction compounds can lead to improvements in iron castings — such as reduction in metal penetration and core erosion — they can result in varying degrees of tensile property reduction.

As casting surface quality becomes increasingly important to end-users, foundries have to find new and effective methods of eliminating surface defects in iron castings.

One method — vein reduction compounds — is used primarily to reduce or eliminate expansion defects, which show up as “veins” on the surface of the casting. Foundries have achieved reductions in expansion defects and imprints in casting quality with mixtures of 90% prepared sand and 10% vein compounds.

However, the key to vein reduction compound use is to be careful when adding the compounds into core sand mixtures, as they can result in varying degrees of reduction in mold tensile properties. This reduction is due primarily to the composition of the materials and the sizing.

This article will take a look at the process of vein reduction and what casting surface quality improvements can result.

Fig. 1. The middle location on this test casting was made with a phenolic urethane binder without the addition of a vein reduction compound. The locations at the left and right both used vein reduction compounds.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand casting, Green Sand System, green sand metalcasting, Foundry Core Coating, Vein reduction

Feeling Out Green Sand Conditioning

Posted by Hill and Griffith Company on Oct 11, 2017 12:31:30 PM

• This article looks at the characteristics metalcasters should be looking for in their sand systems.

• Explained within is the role additives play in creating ideal molding sand characteristics.

For many metalcasters, there is no substitute for the smooth and silky feel of perfect green sand conditioning. While there have been many improvements in sand conditioning practices to achieve this feel, tests designed to determine ideal sand characteristics remain sub-jective, causing foundries to rely somewhat on guesswork.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand casting, Green Sand System, green sand metalcasting, Foundry Core Coating

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: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand 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: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand 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 casting, 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 casting, Green Sand System, green sand metalcasting, core binders

Ductile Iron Metalcasting Primer

Posted by Hill and Griffith Company on Sep 5, 2017 1:54:14 PM

What Ductie Iron Is 

Ductile iron is a family of cast graphitic irons which possess high strength, ductility and resistance to shock. Annealed cast ductile iron can be bent, twisted or deformed without fracturing. Its strength, toughness and ductility duplicate many grades of steel and far exceed those of standard gray irons. Yet it possesses the advantages of design flexibility and low cost casting procedures similar to gray iron. The difference between ductile iron and gray iron is in the graphite formation. Ordinary gray iron is characterized by a random flake graphite pattern in the metal. In ductile iron the addition of a few hundredths of 1 % of magnesium or cerium causes the graphite to form in small spheroids rather than flakes. These create fewer discontinuities in the structure of the metal and produce a stronger, more ductile iron. It is this graphite formation which accounts for the fact that ductile iron is also referred to as "nodular iron." The ductile iron process was developed by The International Nickel Company, Inc. Flowserve Corporation produces valves, pumps, and other process equipment in ASTM A395 ductile iron.

(Above) Ductile Iron A395 material showing random graphite nodules. Etched, magnification 250x.

(Above) Gray Iron Showing random graphite flakes. Unetched, magnification 250x.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand casting, Green Sand System, green sand metalcasting

Join Today - American Foundry Society - Future Leaders of Metalcasting

Posted by Hill and Griffith Company on Aug 31, 2017 4:38:18 PM

Future Leaders of Metalcasting (FLM)

The AFS Future Leaders in Metalcasting (FLM) is an AFS program designed to assist in continually developing the next generation of leaders.  FLM supports and strengthens the network of the next generation of leadership through personal development and outreach. All members must be members of AFS who are on or aspire to be on the management track at their firm. Through two meetings per year, members have access to networking events, executive skills training and community outreach. Given the continuous need for leadership development in our dynamic industry, FLM plays an essential role in the sustainability of the industry.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand casting, Green Sand System, green sand metalcasting, Future Leaders of Metalcasting

EPA Metalcasting M.A.C.T. standards

Posted by Hill and Griffith Company on Aug 22, 2017 3:30:41 PM

Environmental Compliance Featured Products

Look no further than Hill and Griffith’s green sand foundry supplies to help achieve the EPA metalcasting M.A.C.T. standards and reduce Benzene emissions. Our variety of environmentally sound release agents, coatings, partings, lubricants, glues and specialty products will meet your metal casting’s demanding needs.

Hill and Griffith has created a family of green sand products including core glues that are all designed with an eye toward the future. Technological advancements, mineral resources and environmental concerns are constantly being researched and considered in the process of offering products that will help the foundries of the future survive and prosper.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand casting, Green Sand System, green sand metalcasting, Vertical Green Sand Foundry, EPA-Metalcasting-M.A.C.T

Vertical Green Sand Foundry Video from Waupaca.

Posted by Hill and Griffith Company on Aug 15, 2017 2:50:09 PM

Great animation and excellent narration make this video of the vertical green sand foundry process easy to understand.

"Waupaca foundry has patented many improvements in the industry's vertical molding with regards to safety, quality, productivity, and reliability. Our innovative thinking is a large part of how we've lead the industry in delivering consistent, high-quality castings. The vertical green sand molding process begins with a silica sand, clay, and water mixture that is forced into the molding chamber with compressed air. The sand is squeezed under intense pressure, creating a mold with both the strength and hardness to retain its shape.

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Tags: Green Sand Casting Products, Green Sand Foundry Supply, foundry supply, Green Sand Release Agents, foundry supplies, green sand casting, Green Sand System, green sand metalcasting, Vertical Green Sand Foundry

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