Green Sand Metalcasting Foundry News

An editorial review of AFS's "Core Processes" Chapter from the "Casting Buyer's Guide"

Hill and Griffith specializes in compounds and coatings for Green Sand Foundry Process patterns and cores. This post highlights a few parts of the "Casting Buyer's Guide" chapter two on "Core Processes." With a better understanding of cores, you will understand our diverse product selection.

 

"One of the reasons castings are so widely used in all types of applications is due to the great design flexibility to form the internal shape of a casting which is inherent in a variety of processes available to produce a core.

 

The core, which is usually a pre-formed sand aggregate (metal for die casting), is inserted into the mold to shape the interior of a casting or that part of a casting which cannot be shaped by the pattern. The core is located and held in the mold by core pockets, formed by the pattern. In areas where the core may be thin in cross-section or require additional support to maintain metal wall thickness, chaplets are used.

 

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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, AFS Casting Buyers Guide

A partial review of The American Foundrymen's Society's Glossary of Foundry Terms from the "Casting Buyer's Guide"

Permeability - The property of a mold material to allow passage of gases.

 

Physical properties - Properties of matter such as density, electrical and thermal conductivity, expansion, and specific heat. This term should not be used interchangeably with '' mechanical properties.''

 

Pig iron - Blocks of iron to a known metal chemical analysis used for melting, with suitable additions of scrap, etc., for the production of ferrous castings.

 

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This is a great basic description of the "Green Sand" foundry method.

"Molding sand is at the heart of the sand casting process. It must hold a shape well and capture the fine details of a casting, yet be permeable enough to allow gases to escape. Under the strain of having the molding pattern removed from it, or while it is filled, it cannot crumble or sink on itself. When it is turned upside down it must not lose its form: the parts of a mold have to stay true while clamped together.

In most cases, “green” sand is enough to evidence these properties. Green sand is not called that because of its color—these materials can be a wide range of colors depending on composition and use. Instead, it gets its name because it is damp, like green wood.

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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

A review of The American Foundrymen's Society's Glossary of Foundry Terms from the "Casting Buyer's Guide"

Foundry returns - Metal in the form of gates, sprues, runners, risers, and scrapped castings of known composition returned to the furnace for remelting.

 

Gas porosity - A condition existing in a casting caused by the trap­ping of gas in the molten metal, or by mold gases evolved during the pouring of the casting.

 

Gate (ingate) - The portion of the runner where the molten metal enters the mold cavity. Other gates: bottom -any gating system by which metal enters the mold cavity at the bottom.

 

Green sand - Moist clay bonded molding sand.

 

Heat - A single furnace charge of metal to be used for pouring directly into mold cavities; a heat may be all or part of a master heat.

 

Heat treatment - A combination of heating and cooling operations timed and applied to a metal or alloy in the solid state in a manner which will produce desired properties.

 

Hotbox process - A furan resin-based process which uses heated metal coreboxes to produce cores.

 

Hot tear - Irregularly shaped fracture in a casting resulting from stresses set up by steep thermal gradients within the casting during solidification and too much rigidity of the core or mold material.

 

Inclusions - Particles of slag, refractory materials, sand or deoxida­tion products trapped in the casting during solidifica­tion.

 

Investment casting process - A pattern casting process in which a wax or thermop­lastic pattern is used. The pattern is invested (sur­rounded) by a refractory slurry. After the mold is dry, the pattern is melted or burned out of the mold cavity, and molten metal is poured into the resulting cavity.

 

 

Ladle - A container for molten metal used to transfer metal from the furnace to the mold.

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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, Glossary Foundry Terms

Thanks to Belloi & Romaqnoli for this great animation of the green sand foundry process.

Green Sand Preparation, Tight Flask Molding, Rotary Sand and Casting Cooling Shakeout Technology 

"A modern foundry sand preparation system must meet two fundamental requirements, it must produce quality sand and it must continue to deliver this quality over time. Belloi & Romagnoli systems guarantee the supply of quality sand with the right compatibility and green strength with a temperature level below 45 degrees, which is permeable and constant over time. Now, let's see how.

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A review of The American Foundrymen's Society's Glossary of Foundry Terms from the "Casting Buyer's Guide"

AQL - Acceptable Quality Level. A quality level established on a prearranged system of inspection using samples selected at random.

As-cast condition - Casting without subsequent heat treatment.

Backing sand - The bulk of the sand in the flask. The sand compacted on top of the facing sand which covers the pattern.

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Season's Greetings from our family to yours.  

Hill and Griffith's Management & Sales Team 

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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, Happy Holidays

North American foundry and diecasting managers and decision makers give the final word on industry conditions today — and the first word on their expectations for metalcasting growth and development in the coming year.

 

Foundry Management & Technology, "2019 Metalcasting Outlook."

Metalcasting is not an ordinary industrial market: it is sensitive to all types of economic variables (raw materials, energy, labor) as well as financial conditions (interest rates, tariffs.)

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• 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 subjective, causing foundries to rely somewhat on guesswork.

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The metalcasting industry comes together every three years at CastExpo, the largest metalcasting trade show and congress in North America.

(The Hill and Griffith Company's booth at 2016 CastExpo. Visit us at Booth 1519 next year)

CastExpo 2019 is happening April 27-30, 2019, at the Georgia World Congress Center in Atlanta, and you can register right now.

When you attend CastExpo 2019, you'll meet new customers, network with familiar contacts, see the best in new foundry equipment, and discover new business opportunities. Metalcasting success starts with CastExpo 2019.

What's happening at CastExpo 2019?

Exhibits
More than 6,000 customers, peers, prospects, students, and others will be on hand, along with full-scale displays from 400-plus exhibitors.

Education
Metalcasting Congress at CastExpo 2019 delivers thought-provoking sessions on how to improve operations, efficiency and quality. It draws high-level decision-makers who benefit from educational lectures and practical discussions with you in mind.

Keynote Speakers
You'll hear engaging presentations from Frank Abagnale, the inspiration for the film Catch Me If You Can; Dr. Doru Stefanescu, faculty emeritus at Ohio State University and University of Alabama; and Kaihan Krippendorff, founder of Outthinker Roundtables.

Designers and Buyers
CastExpo 2019 is introducing a new line of sessions focused on Casting Designers and Buyers. Sessions will be held in the AFS Hub on the show floor.

Cast in North America (CINA)
This unique exhibit opportunity is the capstone of the supply chain, providing metalcasters the opportunity to showcase their capabilities and services to buyers and design engineers. A series of casting design and purchasing educational sessions will be held to complement the exhibit floor.

Bring Your Own Blueprint
Source your castings by bringing your own blueprints to foundries exhibiting in CINA. Show your casting and machining drawings to representatives from North America's leading foundries, and they'll verify foundry capabilities, feasibility, costs, and material options.

You can get a discount when you register for CastExpo 2019 early. Click here to register now!

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Tags: Metal Casting, Green Sand Casting Products, CASTEXPO, Green Sand Foundry Supply, Foundry Supply, Metal Casting Supplies, Foundry Supplies, Green Sand Metal Casting, Green Sand System, Green Sand Metalcasting, Green Sand Foundry Supplies