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Foundry sand testing
Foundry sand testing is a process used to determine if the foundry sand has the correct properties for a certain casting process. The sand is used to make moulds and cores via a pattern. In a sand casting foundry there are broadly two reasons for rejection of the casting — metal and sand — each of which has a large number of internal variables. The defects arising from the sand can be prevented by using sand testing equipment to measure the various properties of the sand.
==Process==
The testing process is divided into three stages: sampling of the bulk material, sample preparation, and testing.〔(Indian Standards IS1918:1966 Physical testing of foundry sands )〕
It done at three different points of the process: upon first arrival from the supplier, en transport for processing (usually on a conveyor), and after processing. In each situation it is important to take a representative sample by mixing the sand or by taking multiple samples in different locations. Also, the sample must be stored in an airtight container to keep from spoiling it.
There are more than 25 basic tests, however only the important ones for the given casting process are used. The basic tests measure the following parameters: wet tensile strength, cone jolt, friability, moisture content, permeability, green compression strength, compactability, loss on ignition, volatiles content, grain size & distribution, dust (dead clay) content, and active clay content. Each of these tests can lead you to obtain specific characteristics of sand which can be crucial quality of casting.〔Mold & Core Test Handbook, published by the American Foundry Society, ISBN 0-87433-228-1〕 Advanced testing tests for other parameters, such as splitting strength, shear strength, and high-temperature compression strength.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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