<img alt="" src="https://secure.hims1nice.com/150891.png" style="display:none;">

Green Sand Metalcasting Foundry News

Sand Casting

Posted by Hill and Griffith Company on Jul 7, 2020 5:34:52 PM

Excerpt from the September 2019 TheLibraryofManufacturing.com article.

Metalcasting Sand

Sand casting is the most widely used metal casting process in manufacturing. Almost all casting metals can be sand cast. Sand castings can range in size from very small to extremely large. Some examples of items manufactured in modern industry by sand casting processes are engine blocks, machine tool bases, cylinder heads, pump housings, and valves, just to name a few.

Sand

Most sand casting operations use silica sand (SiO2). A great advantage of sand in manufacturing applications is that sand is inexpensive. Another advantage of sand to manufacture products by metal casting processes, is that sand is very resistant to elevated temperatures. In fact, sand casting is one of the few processes that can be used for metals with high melting temperatures such as steels, nickel, and titanium. Usually sand used to manufacture a mold for the casting process is held together by a mixture of water and clay. A typical mixture by volume could be 89% sand, 4% water, 7% clay. Control of all aspects of the properties of sand is crucial when manufacturing parts by sand casting, therefore a sand laboratory is usually attached to the foundry.

Read More

Tags: Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Coatings, Green Sand Release Agents, Green Sand Metalcasting, Core Binders, Green Sand Additive Products

More Flexibility for Green-Sand Molding Operations

Posted by Hill and Griffith Company on Jun 23, 2020 5:31:12 PM

Excerpt from the September 2019 Foundry Management & Technology article.

Top and bottom sand-blowing system extends the Hunter expertise with a new option for foundries' mold-filling needs.

The science of sand molding has not changed for centuries, but the process technologies involved in mold production are another matter. In that case, the changes are demand-driven. Molding machinery is developed to suit the production requirements of foundries, and foundries know where to turn for molding technology expertise.

Hunter Foundry Machinery Corp. has been innovating and refining molding machinery for more than half a century, famously with the Hunter HMP machine that introduced the "matchplate" concept that made green-sand molding faster, more reliable, and more cost-effective, and allowed foundries of all types to be competitive in terms of volume and product quality. It is a rugged, gravity-driven system that’s easy to operate and easy to understand; it is scalable to foundries’ available space; and it adapts easily to different foundries’ molding operations.

Read More

Tags: Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Coatings, Green Sand Release Agents, Green Sand Metalcasting, Core Binders, Green Sand Additive Products, Foundry Management & Technology magazine

A Revolutionary Inorganic Core and Mold Making Process

Posted by Hill and Griffith Company on Jun 16, 2020 4:18:54 PM

Excerpt from February 2009 Foundry Management & Technology article by Nobuyoshi Sasaki.

A novel concept uses sodium and silica to increase the heat resistance of organically bonded molds and cores, which increases hot strength and allows the production of thin-wall castings.

Historically, foundries worldwide have been forced to rely on organic-based core and mold binders, and the use of refractory coatings, along with sand additives, when the hot strengths of the binders are insufficient to produce salable castings.

In 1995, Cadic Corp., and its subsidiary CTI Inc., introduced the Cadic Convert Process, which uses a liquid mixture of silicon oxide and sodium in alcohol to treat resin-bonded molds and cores. In practice, cores and molds produced using organic heat- and amine-cured resins were dipped or immersed in the ethanol solution, dried, and subsequently fired in a kiln to convert the organic-bonded article to an inorganic bonded mold or core.

This post-production treatment of organic-bonded aggregates resulted in the formation of organo-silicates that were converted to ceramics when fired at elevated temperatures, and poured hot to produce thin-wall (2 mm or less) stainless steel castings.

Laboratory evidence, supported by foundry trials, confirmed that the silica compound formed a crystal lacuna surrounding the sodium (Na) at room temperatures and allowed the Na ion to retain its high degree of reactivity.

The subsequent high-temperature treatment resulted in the conversion of quartz to tridymite, thereby increasing the high-temperature properties of the core or mold.

Because of the high degree of reactivity, the Na ion is utilized in this process as the alkali oxide Na2O. In this new process, the nano silica composition allows the Na ion to maintain its reactivity from room temperature to the boiling point of the compound.

With the elimination of a post-production treatment for the core or mold using ethanol as a carrier, the resulting new development makes the Cadic Convert Process considerably simpler, because the nano silica compounds can be added to the sand mix prior to the production of the core or mold in any organic resin-bonded processes, such as phenolic urethanes and shell sand mixtures.

Read More

Tags: Green Sand Casting Products, Green Sand Foundry Supply, Foundry Supply, Green Sand Coatings, Green Sand Release Agents, Green Sand Metalcasting, Core Binders, Green Sand Additive Products, Foundry Management & Technology magazine

The Changes That Will Keep Waupaca Green Sand Foundry on Track

Posted by Hill and Griffith Company on Jul 12, 2016 4:26:51 PM

From Foundry Management and Technology

Read More

Tags: Green Sand Casting Products, Green Sand Foundry Supply, Green Sand Coatings, Green Sand Foundry Lubricants, Green Sand Release Agents, Green Sand Partings, Green Sand Core Oils

Subscribe to the Green Sand Metal Casting News

Recent Metalcasting News

Follow us

Metalcasting News Categories

see all