Castings by John D. Beadle (eds.)

By John D. Beadle (eds.)

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5. A Congleton sand grain showing a small quantity ofclay strongly adhering to its surface ( x 230). 5% are used, the surface properties of a sand become extremely important. In this particular case a smooth, clean siliceous surface (Fig. 3) is essential if minimum binder contents are to be maintained. The surface nature of the Congleton sand shown in Fig. 5 is particularly suited to processes where a high development of green bond is required, eg green sand, oil sand, etc. Congleton sand grains possess a quantity of clay which is strongly adhered to its surface.

Avoided as they have a large surface area and promote a low packing density. Angular sands therefore, normally require substantial proportions of foundry binders to develop reasonable strengths. Well rounded grains of high silica content are, to the author's knowledge, not available in Europe. Indeed, perhaps the only known source of this material is the St. Peters sand deposit in Illinois, USA. The round grain sands one finds in Europe are the beach or lake sands but unfortunately these are invariably of low silica content and as such are not recommended for the higher metal casting temperatures used in the steel foundry.

The artificial vents are connected to a common outlet, usually located in a coreprint formed in the mould. The moulder, when preparing the mould for pouring, connects these vents to the outside of the moulding box and, subsequently, the atmosphere. core must also be easily removed from the casting after solidification ; lack of bond control can result in costly core removal. The property of collapsibility or breakdown is particularly important in the manufacture of such castings as cylinders containing water jackets, complex valve bodies containing intricate port design, fused sand in this type of passage way can result in serious dressing shop problems and the loss of castings.

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