|
|
Article: Reducing casting defects: a basic green sand control program. (part 1)(includes related article)
- Article from:
- Modern Casting
- Article date:
- April 1, 1994
- Author:
CopyrightCOPYRIGHT 1994 American Foundry Society, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
|
The first of this two-part series looks at the tests that need to be performed daily to control the green properties of rooming sands.
This article introduces the basic tests used for controlling a green sand system, how they are run and how they relate to sand control. There are four basic variables that the foundrymen must monitor--aside from system engineering controls--to effectively control green sand. These include the addition of water, bond, new sand and carbonaceous material.
Shown in Fig. 1, the basic sand tests commonly used to control green sand systems include moisture, compactibility, density and specimen weight, permeability, green strength, ...