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Monday, March 24, 2008
Foundry Sand
A) PREPARED BINDERS FOR FOUNDRY MOULDS OR CORES
The heading covers foundry core binders based on natural resinous products (e.g. rosin) linseed oil vegetable mucilages dextrin molasses polymers of CHAPTER39 etc.
These are preparations for mixing with foundry sand to give it a consistency suitable for use in foundry moulds or cores and to facilitate the removal of the sand after the piece has been cast.
However dextrins and other modified starches and glues based on starches or on dextrins or other modified starches are classified in heading 35.05.
Molding-sand preparation
Ensuring the high quality of castings requires the use of automation solutions, also in the foundry sand preparation methods applied in sand casting shops.
Operational analyses and literature lead to the unanimous conclusion that approx. 45-55% of the casting rejects are to be attributed to the insufficient quality of the forming material, i.e. the core sand.
Gravimetric batching of all components is a must, just as is automated water batching.
Owing to the narrow tolerances required in terms of water content, highly accurate sensors (moisture and temperature), an electronic batching system, and a high-performance, sophisticated computer system is needed in order to ensure the compliance with the requirement of a full addition of the required water demand as early as at the beginning of the mixing cycle. This is the only way to ensure a high degree of efficiency of the preparation process. This requirement is particularly critical with today's high-performance mixers. When using a compactibility monitoring system in the prepared sand, the sand-mill operator can be sure to supply high-quality, homogenous forming material to the molding plant.
FRS Starline
Moisture control in sand preparation
High controlling accuracy
Simplified operator guidance via a visualized touch screen monitor
Upgradeable for up to three mixers/coolers of different makes, sizes and performance levels
Rapid integration in each sand control system -linkage involves only a few signals. [Read more...]
FS CC 6 PLC - Sandstar
The big solution in molding material management
Database connection
All functions visualised
Regulations of aggregats
Weighing technology can be integrated
SPC II
For online quality supervision of prepared foundry sands by way of collection of the following measurement variables:
Compactibility
Shearing or compression resistance *
Moisture*
Temperature*
*optional
The SPC II is used in a downward sand flow, for instance, at the mixer exit or at a belt discharge point. Small quantities of molding sand will drop on a rotating plate edge where a stripper is used to select a uniform grain size.
The sand drops into an inspection beaker, where a sensor monitors the filling level. The molding sand is compacted by a compressive force, with the compacting process being recorded and evaluated, for instance by our FS-CC 6 PLC system. Subsequently, the test core will be ejected.
The system can be enhanced by measuring the shearing or compression resistance.
Technical data:
Supply voltage: 230 V AC Compressed-air supply: 5 to 10 bar / ¼” connector SPC II Download product sheet english (PDF 1,5 MB)
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