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Castings by John D. Beadle (eds.) PDF

By John D. Beadle (eds.)

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Extra resources for Castings

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Finished casting for the pump casing, produced from the cores and mould shown in Fig. 1. The core is located in the mould by coreprints; a study of Fig. 1 will reveal the internal cores being positioned in support units in the outer moulds or cores. A coreprint is an extension of the pattern, painted a distinctive colour for identification and designed to locate and support the core during the casting operation.

Table 10. Some sand casting defects and their elimination. FOUNDRY SAND CONTROL Al\1]) SAND CASTING DEFECTS Incorrect sand conditions can easily result in the production of scrap castings. It is for this reason that the majority of foundries today operate an efficient sand laboratory which is responsible for foundry sand control. Foundry sand control can only really be effective if it commences with the testing of all raw materials, sands, binders and additives prior to the preparation of the sand mix.

It is these temperature conditions and the time that the resin coated sand is in contact with the patterns that determines the thickness of mould or core section that is produced. The process is described in detail in Chapter 8. Shell moulds and cores have excellent handling strength even when hot, possess an indefinite shelf life and do not require the application of refractory coatings or blackings before casting. The breakdown characteristics create no Fig. 14. Hot box core assembly and casting for the Avenger car.

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